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JPH114500

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DESCRIPTION JPH114500
[0001]
FIELD OF THE INVENTION The present invention relates generally to the reproduction of stereo
sound, and more particularly to reproducing stereo sound associated with a video image, such
that the conversation is focused on the video image, and Attached to the video image so that the
environment (atmosphere) and sound effects are reproduced in a way that makes the listener feel
as if it is in a realistic (or realistic) three-dimensional sound field. Related to playing stereo sound.
[0002]
BACKGROUND OF THE INVENTION In the past, numerous monaural and stereo sound systems
have been developed to provide sound reproduction with high reproduction fidelity. Early
attempts, efforts and research have made the concept of playing high-fidelity monophonic audio
sounds obsolete. That is, in an early attempt or study, a speaker enclosure (speaker enclosure)
that meets performance conditions (reproduction conditions) or criteria determined by
measurable acoustic characteristics (for example, frequency response, distortion and dynamic
range). The focus was on manufacturing casings. The speaker comprises an enclosure that
includes one or multiple acoustic transducers and crossover networks to reproduce sound in the
full audio frequency range. A 3-way speaker system, which is an example of such a dual
transducer crossover network structure, includes a woofer transducer for reproducing low
frequency sound, a mid-range transducer for reproducing medium frequency sound, and a
tweeter transducer for reproducing high frequency sound. And.
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[0003]
The exemplary crossover network described above is characterized by smoothly transferring the
acoustic output of one transducer to the acoustic output of another by blending (combining) the
acoustic outputs of multiple speaker transducers. To get a good tone balance. One way to obtain
such a good tone balance is to employ a symmetrical crossover network, which acts as a filter.
This filter is to ensure response drop-off of one transducer. The reason is that the rise in
frequency at the transition region is a mirror image of the increased response of the
accompanying transducer that reproduces the nearby high frequency band of sound. Proper
implementation of this structure is subject to the fact that the combination of multiple
transducers and a crossover network does not produce an audible artificial sound (unnatural
sound quality). Audible artificial sounds (unnatural sound quality) are produced by irregular
frequency response and phase cancellation effects. The occurrence of irregular frequency
response etc. may be due to accommodating multiple transducers in one speaker enclosure.
[0004]
The earlier attempts to achieve high fidelity reproduction with monophonic audio and audio
signals and a three way crossover network have gradually given way to stereo sound
reproduction. Early stereo systems were equipped with a pair of spatially separated identical
high-fidelity speakers to reproduce the audible sound signals of the two channels. Thus, the
spatial separation of the two loudspeaker enclosures is fundamental to the concept of stereo
sound reproduction. A stereo image results when the sound output from the pair of speakers
fuses into one stereo image perceived as a horizontal panorama of sound. This sound panorama
forms a stereo sound image across the space between the two speakers for the viewer (listener).
An appropriate stereo effect is experienced by the viewer, which extends between the two
speakers and is located along a line perpendicular to the plane of the speakers.
[0005]
Most of the speakers built into stereo systems emit sound linearly from the speakers to the
viewer (called direct radiation). To spread the stereo image, the designer used a pair of speakers
that emit (emit) a combination of direct and reflected sound. In such an arrangement, the stereo
image extends beyond the space between the two speakers.
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2
[0006]
Some more modern stereo sound systems employ a three-piece sub-satellite speaker system. In
this system, a combination of a sub-woofer bass unit and a pair of satellite speakers is used in
place of the conventional pair of full range speaker enclosures described above. In such a threepiece loudspeaker system, the satellite loudspeakers reproduce a wide range of medium and high
frequency sounds, and the bass unit reproduces only very low frequency sounds. Satellite
speakers can be made relatively small compared to traditional large-sized stereo speaker boxes,
as the bass (bus) playback is performed only by the subwoofer bus unit. The above traditional
speaker box has been forced to be large in size due to the large transducers and enclosures
needed to achieve good bass response. Many consumers prefer the small satellite speaker
structure to such a traditional pair of full range speaker enclosures. The bus unit can be located
out of sight, and the satellite speakers can be more easily adapted to the interior decoration
(fusion and integration). However, other consumers find it difficult to install them by integrating
them with things or decorations in the house so that the above-mentioned somewhat small
satellite speaker box does not enter the field of view and does not get in the way .
[0007]
In the modern world, the overall sound quality of the loudspeakers has been improved, but with
the most elaborate system (whether it is a pair of stereo speakers or a three-piece subsatellite
speaker system) Even with improvements, many consumers find that modern sound systems lack
the sonic realism and presence that accompanies live sound. Although each sound reproduction
system satisfies quantitative acoustic performance (sound reproduction) conditions related to
frequency response, distortion and dynamic range, it is broad in terms of sonic realism (acoustic
realism and reality) from a qualitative point of view Make the audience in the area unhappy. It is
known that in some systems designed to produce more realistic sounds, the reproduced sound
can be perceived as spacious, spacious and spacious. Such a design is a major advance in the field
of acoustics in improving the spatial quality of the reproduced sound and avoiding the generation
of (unnatural) artificial sounds that detract from the overall sonic experience. Became the
foundation of
[0008]
The above three-piece sub-satellite speaker system extends the concept of spatially separating /
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3
dispersing the speaker components (a pair of stereo speakers, etc.). This concept can be further
extended by spatially distributing, in significant numbers, point sources that reproduce sound in
the listening environment to further increase perceived robustness. It can. By adding a plurality
of spatially distributed sound point sources, it is possible to perceive the magnificence better, but
on the other hand, it creates an exaggerated, slightly overkilled spatial feeling. There is no
realism or realism in this. Such unnatural sound reproduction often causes the viewer to feel
acoustic fatigue. Thus, to fully satisfy the viewer, the enhanced magnitude must be balanced with
the perceived acoustic realism of the created sound field.
[0009]
This balance is especially important in the case of a home theater (in home theater) sound
system. This is because the sound conditions (required requirements) of the home theater sound
system are different from the sound conditions of the sound reproduction of stereo music. The
important goals of the home theater sound system are: (1) surround sound acoustic atmosphere
that can be convincing based on the environment (atmosphere) and sound effect audio signals
that are captured in the sound track (2) maintaining a stereo image panorama of the sound in
front of the viewer, and (3) playing a conversation centered on the video screen to all viewers in
the room. In short, satisfactory sound performance (sound reproduction) is in the sound field
with a three-dimensional spatial quality that the viewer can perceive as real in relation to the
visual image on the video screen (in relation to it). What you can do when you are in
[0010]
In the early attempts to create home theater sound, a pair of traditional speakers were placed on
either side of the center video display. Such a system can produce better sound than the speaker
built into a typical television. However, the performance of such systems has been unacceptable
in the market for at least two reasons. The first reason is that for a viewer who is not on the
center line between the two speakers, the conversation does not feel concentrated on the screen
(i.e. it does not feel that the conversation only comes from the screen). Conversations are usually
recorded equally in the left and right channel signals. Thus, where conversations concentrate is
at points of equal distance from the two speakers. That is, only the viewer who is on the center
line between the two speakers can perceive the concentration of the conversation. If the viewer
deviates from the center line, the viewer approaches one speaker and moves away from the other
speaker. The concentration of speech shifts in the direction from which the first arriving signal
came. That is, it shifts to the closer speaker. When the viewer moves away from the center line,
the conversation collapses to the nearer speaker, collapses, collapses, and collapses. For viewers
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who are not on the central line, the concentration of the conversation moves from the position of
the video image, and the illusion that the person on the screen is actually covering the viewer
who is not on the central line breaks down. The second reason is that a pair of stereo speakers
placed on both sides of the visual display will confine the sound field in the space in front of the
viewer in the plane determined by the two speakers. Therefore, the viewer does not experience
any feeling of being in the sound field or being immersed. In other words, you don't feel that the
sound is happening next to or behind the viewer, and sometimes at the front.
[0011]
Many systems have been developed to solve the above problems. For example, U.S. Pat. No.
3,697,692 (Halfer) discusses the use of ambience-recovery techniques. The above-mentioned U.S.
patent makes use of the fact that surround sound information is present and recoverable in
virtually all stereo audio signals (whether it is a music recording or a soundtrack of video
program material). Recovery is obtained by obtaining the difference signal (LR) of the left and
right channels (substantially leaving only the ambience portion of the signal). The recovered
surround sound information is provided by a difference signal (L-R) obtained by subtracting the
right channel signal from the left channel signal reproduced by the speaker placed at the back of
the listening room.
[0012]
Other early home theater sound systems improve the quality of speech sound reproduction by
adding a center channel and reproducing the sum signal (L + R) of the left and right channel
signals. The center channel is combined with the rear surround speaker (s), which reproduces the
difference signal of the left channel signal-right channel signal (L-R). This is similar to the above
environment recovery speaker. An example of such a system was developed by Dolby
Laboratories in the United States under the name DOLBY SURROUND (Dolby Surround).
[0013]
The central speakers, which reproduce the sum signal (L + R) as commercialized in the above
Dolby Surround system, are ideal in that they make the concentration effect of conversation ideal
for the viewer not on the center line between the above speakers It is producing results.
However, the (L + R) center channel reproduction does not completely solve the problem that a
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viewer who is not on the center line between the speakers senses a gap or mismatch between the
auditory image and the visual image. These systems also have the problem that errors occur in
concentration about speech (and that other signals are encoded in the sum signal). This is
because passive decoding devices such as Dolby Surround can only separate adjacent channels
up to 3 dB. (Here, adjacent channels are center and right, center and left, left and surround, and
right and surround. 3) The level difference of 3 dB between the center channel conversation and
the left and right channel conversations is insufficient to limit the concentration at the center
channel speaker position at the listening position across a typical listening room. For a viewer
who is not on the center line between the speakers, the concentration still shifts to the closer
speaker. Collapsing with the closer speaker is a common problem with all conventional passive
decoding systems.
[0014]
Another example of a Dolby Surround system is that of T-shaped construction is proposed by U.S.
Pat. No. 4,612,663 (Holbrook). This system generates surround sound by passively combining
stereo signals. This T-shaped system is located between the left and right speakers for
reproducing the left and right signals, and between the left and right speakers and on the same
plane as the left and right speakers, and the difference signal (LR) is A third speaker to reproduce
and a fourth speaker positioned behind the viewer to reproduce the difference signal. However,
this system can not maintain a rational sonic image if the stereo signal has energy temporarily
offset to the left or right channel. Also, the above system can not prohibit the perception that a
conversation is being emitted from the closer speaker (the left or right speaker).
[0015]
Yet another system utilizing the (LR) and (RL) difference signals is shown in U.S. Pat. No.
5,027,403 (the inventor and patent owner: Short et al.). This patent describes the use of the left
and right channels facing forward to produce sound output in the direction of the viewer. This
patent also describes directing (L + R) bus signals backward from the normal face of the video
viewing area. In addition, this U.S. patent describes directing and transmitting (L-R) and (R-L)
signals from near to the back or side of a video image. However, this U.S. patent has the
disadvantage that all the sound emitted from the speaker is emitted from the video image. Such
near planar sound emission can not provide the full environmental and surround sound effects.
[0016]
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Another example of a system having a plurality of loudspeakers in a substantially planar
arrangement is disclosed in U.S. Pat. No. 4,497,064 (Polk). This U.S. Patent also describes
providing left and right main speakers and sub speakers. The sub-speaker is located near the
main speaker. This arrangement provides the viewer with an expanded and expanded acoustic
image as the stereo sound is played back. However, the system of this U.S. patent requires certain
severe limitations and requirements. For example, the speakers should be equidistant from the
viewer. This is to ensure that the sound reaches the viewer within a predetermined time. The U.S.
patent also describes high pass filtering of the inverse of one main speaker signal for use as the
output from the opposite sub-speaker. High-pass filtering cancels the opposite main speaker
component. If high pass filtering is not performed, the above components will reach the filtered
end of the viewer's ear. However, high pass filters do not cancel out low frequency components
in order to maintain the concentration of audio information on the video image. The abovementioned U.S. patent further requires in particular that all system loudspeakers have to be kept
approximately in the same plane and that the radiation must be directed towards the viewer. In
addition, the system of this patent can not keep the program material recorded equally to the left
and right channels concentrated in the central area of the two speakers for viewers who are not
on the central line of the two speakers. Such signal concentration shifts to the closer speaker for
viewers who are not on the center line of the two speakers.
[0017]
An example of a non-planar speaker arrangement is disclosed in U.S. Pat. No. 4,443,889
(Norgaard). In this U.S. Patent, it is described that the left front speaker and the right front
speaker are used to reproduce stereo signals of left and right channels, respectively. Also, the
above-mentioned U.S. Patent describes the use of the (L-R) difference signal via the rear speakers
to generate an ambient signal. However, among other things, the U.S. patent does not consider
combining the (L + R) sum signal through the central speaker to better focus speech on video
images.
[0018]
U.S. Pat. No. 5,181,247 (Holll) discloses a similar concept for using (LR) and (RL) difference
signals. However, this patent does not teach the use of one speaker to output an (L + R) sum
signal. Also, this patent does not disclose band limiting for signal input to ambient speakers.
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[0019]
U.S. Pat. No. 4,819,269 (Klayman) emits sound based on sum signals with a limited dispersion
pattern, and based on difference signals with a wide dispersion pattern. It is described that the
sound is emitted. The emitted signals are combined acoustically to improve stereo sound in the
listening area. However, in this U.S. patent, in order to obtain the desired effect described above,
a dedicated, special wide distribution pattern of horn-type loudspeakers (horn) or an array of
transducers is required. . Furthermore, the above-mentioned U.S. Patent does not describe
excluding the primary frequency range of vocal energy from the output of any loudspeaker in
order to concentrate the conversation on the central loudspeaker.
[0020]
Other surround sound type systems require complex signal processing to improve the bright
separation between left, center, right and surround channels. The most common system of this
type in use today is the DOLBY PRO-LOGIC (Dolby Pro Logic) decoder system. This system
improves the solution to the basic problems of many conventional passive decoding systems
described above. Decode matrix-encoded audio signals using active electronic circuitry, introduce
time delays, and channel-to-channel via auto-gain control circuitry (auto-gain control circuitry)
Steer the However, significant cost is required to improve performance in this manner. This is
because the Dolby Pro Logic system requires at least four separate amplification channels.
[0021]
Also, due to its nature, in an active electronic signal processing system, there is a possibility that
an artificial sound (sonic artifact: an unnatural sound quality that destroys a sense of realism and
presence) may be included in the response. One such artificial sound in a Dolby Pro Logic system
originates from an active steering circuit that changes the amount of adjacent channel signal
drawn from the signal. For example, if a conversation is present and it is desired to center the
conversation, the center channel signal is subtracted from the left and right channel signals to
remove the speech energy from these channels. This variable subtraction dynamically alters the
channel separation and maintains the main concentration in a particular direction. As the
conversation goes in and out of the scene, the viewer often hears the environment coming and
going, which causes the atmosphere to be created in the audio-video presentation. be able to. The
shrinking down and growing back of the environment with the introduction and cessation of the
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conversation distracts the viewer's feelings and attention. Thus, it can be seen that this active
electronic signal processing system is clearly unsuitable for home theater sound reproduction.
[0022]
Another problem with Dolby Pro Logic systems is that they can not operate properly without the
encoded program material. Materials that are not encoded, or that are degraded / degraded for
some reason, disrupt logic circuits, and when the decoder (decoder) is steered in an unintended
manner, it is strange and extreme spatial Produce spatial effects. Another major problem with
active Dolby Pro Logic decoding systems is that they are expensive for the consumer and
complex in nature, making it difficult for the consumer to properly install and use the system It
is.
[0023]
More recently, recurrent attempts have been made to create less expensive low cost passive
surround sound systems. An example of such a system is disclosed in U.S. Pat. No. 5,386,473
(Harrison). This US patent is a transformer that passively multiplexes a line level stereo television
output signal that needs further amplification to generate the high level signal necessary to drive
the speaker. transformer) is used. The transformer receives input left and right channel signals
and forms left front, right front, left rear (L-R), right rear (R-L), center (L + R) and sub-woofer
channels. This patent seeks to achieve surround sound effects by solving problems arising from
the use of speakers connected to the high level amplifier output, especially by converting low
level signals. However, in the above-mentioned U.S. Patent, it is difficult to properly move a
passive surround sound system with high level signals. The present invention provides surround
sound, especially using high level signals, and solves the problems associated with the high level
systems described in the above-mentioned U.S. patents (e.g. cost issues for high performance
components, balance issues etc) It is
[0024]
Another recent attempt at passive compounding is the QD-1 Series II decoder manufactured by
Dynaco. The QD-1 Series II decoder receives the signal from the stereo amplifier. The decoder
then generates four (or five) signals (for two front speakers, two rear speakers, and an optional
center channel speaker). A second similar decoder is the HTS-1 decoder manufactured by Chase
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Technologies. Similar to QD-1, Chase's decoder receives signals from the amplifier and then
generates signals for a pair of front speakers and a pair of rear speakers. The Chaser decoder
also produces a signal for an optionally amplified center channel speaker.
[0025]
The two passive decoders described above have two major drawbacks. The first drawback is that
the resistor network used to generate the (L + R) signal for the central channel dissipates and
dissipates energy, so the output is high enough to compensate for this energy loss The need for a
(high performance) receiver or stereo amplifier. All speakers in the system are used in portable
boom-boxes or televisions of a type that consumes no power (energy) at all in relatively lowpower amplifiers (eg, signal summing resistor networks) It is desirable to provide a system that is
driven by the In one such conventional system, the center channel speaker must be powered to
perform the desired function of maintaining speech concentration at the physical location of the
center speaker. The second drawback is that the conversation emanating from the rear surround
speakers will contain artificial sound as a certain amount of (L + R) signals are supplied to the
rear surround speakers. Therefore, the sense of realism and reality of the intended environmental
effect is lost.
[0026]
Therefore, in order to provide a speaker system that greatly appeals to the market at a
reasonable cost by limiting the cost of the speaker system, the present invention is directed to a
surround sound speaker system for a home theater that operates using relatively simple passive
electronic components. Requests still exist. Of particular importance in these systems is that the
loudspeaker system provides a consistent (constant) ambient sound field, as well as in all
locations of the listening area and the viewing area. , To keep the conversation focused on the
video image. Speech and visual images are also preferably matched in the video image, and
preferably are not moved in the direction of a particular speaker.
[0027]
In addition, audio designers have paid considerable and special attention to designing a speaker
system that reproduces the left and right channel audio signals of a stereo signal to create a
three dimensional surround sound sound effect. However, audio engineers almost ignored the
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mono sound market. Many consumers still have monaural televisions, which output only one
monaural channel, not the left and right channel components of the stereo signal. This allows a
consumer who currently has a monaural television to hear only the sound emitted from the
location of the television. Also, while AM stereo is continually researched and adopted by a few
limited stations, the majority of AM broadcasts continue to use monaural. In addition, many
programs that can be viewed on television, VCR (video cassette recorder), cable, satellite and
other stereo audio / video signal distribution systems have monophonic soundtracks.
[0028]
Some stereo and home theater audio / visual receivers have applied signal processing techniques
to monaural sound signals to produce simulated stereo or enhanced spatial sound effects. Such
signal processing usually requires other complex phase shifts, filtering and digital signal
processing circuits. Thus, to obtain simulated stereo or three-dimensional spatial effects from a
monophonic audio signal, the consumer has the cost of purchasing a receiver, surround sound
decoder or other sound processing electronics as described above and a suitable speaker
network. I have to bear it. Thus, there is a need for a low cost system for efficiently reproducing a
monophonic audio signal so as to produce a convincing three dimensional sound effect.
[0029]
Of course, it is desirable to propose a home theater surround sound system with all the above
advantages, but more realistic and theoretical problems exist in home theater systems. That is, as
the home theater system continues to improve and improve, the number of parts that are
separately required usually increases. Such components often include active electronic controls,
numerous speaker connections, supplemental control modules, and separate audio system
interconnects. Such troublesome parts often embarrass the average consumer during its
installation. Despite numerous attempts by manufacturers to make installation of parts more
user-friendly and ease of installation, many users experience difficulties in properly installing the
system components. The most recent attempts at facilitating the mounting process have, in
addition to labeling the connection jacks, colored by the connections and connections of the
loudspeakers and audio signal source, as the user can visually recognize Signs and abbreviations
have been added. In this way, detailed and complete installation procedures and methods can be
presented. However, for many reasons, the above approach has not been accepted by consumers
as a way to properly and easily install a home theater sound system. And many consumers had to
ask for professional installation such as professional servicemen for a fee.
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[0030]
Therefore, the home theater surround sound system can be greatly simplified installation, and
the consumer can easily and accurately install and operate the system in a relatively short time,
and thus can greatly appeal to the market. There is a demand for offering.
[0031]
The present invention applies and uses various acoustic design principles in a novel way, and
combines the adjacent channel separation and the individual channel operating bandwidth in a
novel way. , Achieve many goals.
[0032]
The object of the present invention is to provide a video that focuses the conversation on the
video screen for the viewer across the viewing area, while maintaining a consistent and majestic
3D sound field. It is to form a sound field with a sense of realism and presence while providing
images.
[0033]
Another object of the present invention is a real movie equivalent to or better than the surround
sound of a complex and expensive active electronic multi-channel surround-sound matrixdecoding system. It is to provide a low cost sound reproduction speaker system capable of
producing a surround sound like a hall.
[0034]
Another object of the present invention is to avoid the generation of environmental
destabilization artifacts associated with active electronic signal processing, as well as speech and
environmental audio signals in order to unify the image and the acoustic image at a reasonable
level. Passively separate the regeneration of the
[0035]
Another object of the invention is to use a conventional audio signal source (e.g. a two-channel
stereo or matrix-encoded stereo signal) without the use of auxiliary matrix decoding electronics. )
Is to play sound with a spacious feel.
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Another object of the present invention is to provide a sound reproduction speaker system
capable of producing spatially enhanced surround sound sound effects even for monaural audio
signals.
[0036]
Another object of the present invention is to provide a speaker system which is relatively easy
and easy for the average consumer to install and operate.
This includes allowing the consumer to connect the parts in a relatively short time without fail.
[0037]
Another object of the present invention is to provide a speaker system which can be easily and
directly connected to a stereo television without the use of a separate audio-video receiver or
amplifier.
[0038]
Another object of the present invention is to provide movie theater surround sound at normal
home listening levels using low watt power amplifiers or the equivalent in commercialized stereo
TVs .
[0039]
Another object of the present invention is a speaker having a very small size and capable of
sufficient sound reproduction with a small satellite speaker which can be positioned invisibly in a
home environment without affecting the acoustic performance It is to provide a system.
[0040]
SUMMARY OF THE INVENTION According to the technical idea of the present invention, a home
theater surround sound speaker system is capable of conversation by reproducing a stereo audio
portion of an audio / video image (audio / video presentation) in a novel manner. Focus on the
video image, and the viewer feels as if it is within the sound field that can be perceived as perfect
in relation to the visual image (immersed in the sound field).
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[0041]
In a first preferred embodiment of the present invention, a passive high powered, passive
unpowered speaker system comprises a front speaker, a left speaker, a right speaker and a rear
speaker, each speaker being It receives an electrical input signal and provides an acoustic output
based on the electrical input signal.
The front speaker is placed close to the video image and produces an audio output based on the
left + right (L + R) sum of the left and right channels of the stereo signal.
Thus, the conversation concentrates on and matches the video image.
The right and left speakers may be coplanar with the front speakers, but are preferably located
between the viewer and the front speakers and are located to the left and right of the viewing
area.
The left and right speakers respectively output sound based on the left and right stereo channels.
The rear speakers are placed behind the viewing area and produce an acoustic output based on
the difference between the stereo channel signals, i.e. the left-right (LR) or right-left (RL)
difference signal.
This difference signal substantially eliminates speech and provides ambient and surround sound
audio information.
The left and right channel electrical signal inputs respectively input to the left and right speakers
are band-limited to substantially eliminate all frequency components below a predetermined
threshold frequency. By band limiting, the conversation is concentrated on the front speakers.
This is because the filtering substantially removes the signal energy of the speech signal range
from the left and right channel signals being acoustically reproduced.
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[0042]
In a second preferred embodiment of the present invention, the passive high power non-powered
speaker system comprises a front speaker, a left speaker, a right speaker and a rear speaker,
each speaker having an electrical input signal Receive and provide an acoustic output based on
this electrical input signal. The front speaker is placed close to the video image and produces an
audio output based on the left + right (L + R) sum of the left and right channels of the stereo
signal. Thus, the conversation concentrates on and matches the video image. The left speaker
may be coplanar with the front speaker but is preferably located between the viewer and the
front speaker and to the left of the viewing area. The left speaker, for example, provides an
acoustic output based on the electrical input difference signal (L-βR). Here, β is a gain factor
that varies between 0 and 1 or a fixed gain factor between 0 and 1. Similarly, the right speaker is
preferably located between the viewer and the front speaker and to the right of the viewing area.
The right speaker, for example, provides an acoustic output based on the difference signal (RβL). Here, β is a gain factor that varies between 0 and 1 or a fixed gain factor between 0 and 1.
The rear speakers are placed behind the viewing area and sound output based on at least one of
the differences between the stereo channel signals, ie at least one of the left-right (LR) or rightleft (RL) difference signals. Put out. Utilizing this difference signal substantially removes the
speech portion of the audio signal, thus leaving ambient sounds in the difference signal. In this
second preferred embodiment, the difference signals respectively input to the left and right
speakers are band limited, if necessary, to substantially eliminate all frequency components
below a predetermined threshold frequency. By bandlimiting the difference signal, the low
frequency components of the difference signal are substantially eliminated, so that the difference
signal can be reproduced using a very small compact speaker.
[0043]
In a third preferred embodiment of the present invention, the high power powered loudspeaker
system comprises a front loudspeaker, a left loudspeaker, a right loudspeaker and a rear
loudspeaker, each loudspeaker receiving an electrical input signal, Provides an acoustic output
based on the electrical input signal. By preprocessing and amplifying the left and right channels
of the stereo signal with active electronics, for example, the left + right sum signal (L + R) and the
difference signal (LR) are produced. The resulting sum and difference signals drive the individual
speakers of the speaker system. The front speakers are placed close to the video image and
produce an acoustic output based on the sum signal. Thus, the conversation concentrates on and
matches the video image. The left speaker is located on the left side of the viewing area and
produces an acoustic output based on, for example, the difference signal (LR). The right speaker
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15
is located to the right of the viewing area and provides an acoustic output based on, for example,
the difference signal (R-L). The rear speakers are placed behind the viewing area and provide an
acoustic output based on the difference signal. In this third preferred embodiment, the difference
signal may be inverted by reversing the polarity provided to a particular speaker. Also in this
third preferred embodiment, the difference signals respectively input to the left and right
speakers are band-limited, if necessary, to substantially eliminate all frequency components
below a predetermined threshold. By this, the reproduction of the difference signal can be
performed using a very small compact speaker.
[0044]
In a fourth preferred aspect of the present invention, the loudspeaker system comprises a front
loudspeaker, a left loudspeaker, a right loudspeaker and a rear loudspeaker, each loudspeaker
receiving an electrical input signal and producing a monophonic sound based on the monaural
electrical input signal Give an output. The front speakers are placed close to the video image and
produce an audio output based on the mono signal. The left speaker may be coplanar with the
front speaker, but is preferably located between the viewer and the front speaker and to the left
of the viewing area. The left speaker produces a monaural sound output based on the monaural
electrical input signal. Similarly, the right speaker is preferably located between the viewer and
the front speaker, and to the right of the viewing area. The right speaker produces a monaural
sound output based on the monaural electrical input signal. The rear speakers are placed behind
the viewing area and provide a monophonic audio output based on the monaural input signal.
Because mono signals are used, even users with only mono audio sources can obtain an
enhanced spatial sonic image or sonic sound effects based on mono signals. . The monaural
signals respectively input to the left and right speakers are band-limited as described above, and
all frequency components below a predetermined threshold frequency are substantially removed.
By band limiting the mono signal, the low frequency components of the mono signal are
substantially removed, so that the signal can be reproduced using relatively small and compact
satellite speakers. Also, by band limiting, it is possible to prevent (limit) the reproduction of the
main (large) vocal energy by the central speaker.
[0045]
The present invention also relates to power amplifiers that receive and amplify left and right
input signals and output them to the left and right speakers, respectively. In the high-power and
power-supply type having an integrated amplifier, a system designer can generate an amplified
output signal adjusted to a specific speaker selected by himself. According to such an integrated
10-05-2019
16
structure, the acoustic output of the system can be easily optimized.
[0046]
The invention further relates to a separate (additional) bass speaker for reproducing the low
frequency components of the stereo signal. The bus speaker may be located anywhere in the
viewing area, and provides an acoustic output based on the low frequency component of the (R +
L) sum signal.
[0047]
The invention also relates to an interconnection module that facilitates installation and operation
by the user. The interconnection module comprises input and output jacks having a
predetermined number of terminals. The predetermined number of terminals indicates what
signal is input or output by the jack. For example, an output jack having three terminals outputs
left, right and common ground electrical signals, respectively. This construction of the input and
output jacks allows for proper installation of the system. The reason is that the user only needs
to assemble the speaker system in one specific form / method. The speaker system may have the
interconnection module as an additional independent component, or the interconnection module
circuit may be integrated with one of the existing components (eg, a bus speaker or a front
speaker) It is also good.
[0048]
The invention also relates to the wireless implementation of the above system. When made
wireless, the audio signal is supplied from the audio signal source to the interconnection module
by electrical audio signal connection. The interconnection module has active electronic
components for generating both the difference signal and the sum signal. A wireless transmitter
receives and transmits the difference signal. The left, right and rear speakers each have a radio
receiver tuned to the frequency of the radio transmitter. The receiver then provides an amplified
electrical signal suitable for producing an acoustic output with an associated speaker (providing
an amplified electrical signal so that the associated speaker is more likely to produce an acoustic
output). Other objects and advantages of the present invention will be apparent to those skilled
in the art from the following detailed description and claims, which should be read in conjunction
with the accompanying drawings.
10-05-2019
17
[0049]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will
now be described in detail with reference to the attached drawings.
[0050]
The following description of the preferred embodiments is merely exemplary, and is not intended
to limit the technical scope of the present invention or its application / use scope.
In the present specification and drawings, parts having the same structure and function are
denoted by the same reference numerals.
[0051]
The embodiments described herein improve the prior art in several respects and will be briefly
described first. First, according to the present invention, in order to make the viewer perceive the
spaciousness, several speakers are spatially distributed in the listening room. Spatially distributed
includes providing left and right speakers, rear speakers, front (or center) speakers, and
subwoofers. Second, in the present invention, concentrating the sound radiation pattern on the
front or center speaker causes the viewer to appear as a predetermined sound comes out of the
speaker. The invention also plays a specific sound to create ambient surround sound throughout
the room. Such sounds are preferably emitted from speakers other than the front or center
speaker. Third, in the present invention, frequency band limiting is performed to remove specific
audio frequencies generated by the left and right satellite speakers. The band limiting frequency
is determined and selected with the intention of removing the vocal energy output from the
satellite speaker. Fourth, in the present invention, the frequency ranges of the plurality of
loudspeaker components are overlapped in an unusual manner. Thus, each of the front, rear and
side speakers has a relatively wide overlap frequency range. Fifth, the present invention passively
outputs acoustic signals of the left channel, right channel, left + right channel, and left-right
channel using several kinds of different means for passively generating signals. Do.
[0052]
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18
FIG. 1 schematically shows a home theater surround sound speaker system (sometimes referred
to as a "surround sound system") 10 arranged based on the principles and technical ideas of the
present invention. The surround sound system 10 comprises a source of appropriately amplified
stereo signals (shown as TV 12 in FIG. 1). The stereo audio source may be any of a number of
audio signal sources. Thus, although the stereo audio signal source is shown here as a television
12, the audio signal source may be a stereo receiver, a car stereo, a portable compact disc or tape
player, a portable boom-box type stereo (one or It may be a so-called cassette CD radio cassette,
in which a plurality of radios, a CD player and a cassette tape deck are integrally combined, or
any other stereo signal source.
[0053]
The television 12 outputs the amplified audio signal to the interconnection module 14 via the
multicore cable 16. The multicore cable 16 typically has two sets of core wires for conveying the
left and right channels of the stereo signal output from the television 12 to the interconnection
module 14. The interconnect module 14 receives audio signals from the television 12 and
combines component (bar) left and right channel signals to selectively distribute to specific
component (bar) speakers of the surround sound system 10.
[0054]
The component loudspeakers typically have a subwoofer 18 that receives the full range left and
right signals but reproduces only the low frequency components of the audio signal. The
interconnect module 14 also outputs the audio signal to the front center speaker 20. The front
center speaker 20 receives both left and right component signals of the stereo signal and
reproduces the (L + R) sum signal. Preferably, the front center speaker 20 is located near the
television 12 and emits an audio output of the (L + R) sum signal towards the viewer (listener)
28.
[0055]
The interconnection module 14 outputs a left channel signal to the left satellite speaker 22 and
outputs a right channel signal to the right satellite speaker 24. The left satellite speaker 22 and
the right satellite speaker 24 may be relatively small speakers, and need only reproduce medium
10-05-2019
19
range and / or high frequency signals. The left and right satellite speakers are preferably
oriented such that the main emission axes of the speakers are directed upward along the vertical
axis. However, even if the satellite speakers are directed in other directions, sufficient
performance, performance, and performance can be obtained. The interconnect module 14 also
outputs the audio signal to the rear environment speaker 26. The rear environment speaker 26
typically receives audio signals in the form of left channel-right channel (LR) or right channel-left
channel (RL) difference signals. As will be apparent from this detailed description, in some
embodiments of the invention described herein, interconnection module 14 generates various
signals to allow left satellite speaker 22, right satellite speaker 24 and / or Or, it can be output to
the rear environment speaker 26. It should be noted first that the term speaker means a system
for converting an electrical input signal into an acoustic output signal. Here, the system includes
one or more crossover networks and / or transducers.
[0056]
The components shown in FIG. 1 are typically arranged to optimize the surround sound effect to
enhance and enhance the listener's 28 listening experience. The viewer 28 typically faces the
television 12 and the television 12 has a front center speaker 20 near it. Thus, the front center
speaker 20 and the television 12 radiate audio and video outputs towards the viewer 28,
respectively. The left satellite speaker 22 is typically located to the left of the viewer 28 and the
right satellite speaker 24 is located to the right of the viewer 28. These two satellite speakers are
typically located approximately at the center of the viewer 28 and the television 12. The rear
environment speaker 26 is a speaker that contributes to creating a spacious sound effect,
typically located behind the viewer 28. Although the rear environment speaker 26 is depicted as
a single speaker, the system of the present invention may have multiple rear environment
speakers 26.
[0057]
FIG. 2 shows an enlarged block diagram of a preferred embodiment of the present invention. In
this expanded block diagram, a partial circuit and wiring diagram is shown, and is referred to
herein as a block diagram, a circuit diagram or a wiring diagram. The home theater surround
sound speaker system 100 (sometimes referred to as "surround sound system") includes a left
side satellite speaker 102 (sometimes referred to as "left side or satellite speaker") and a right
side satellite speaker 104 ("right side or (Also referred to as satellite speakers), a front center
speaker 106, a surround or rear speaker 108, and a subwoofer speaker 110. The left channel
amplifier 112 outputs an amplified left channel signal. This signal is input to the positive
10-05-2019
20
terminal of the voice coil 114 a of the front center speaker 106. The negative terminal of the left
channel amplifier 112 is connected to the negative terminal of the voice coil 114 a of the front
center speaker 106. Similarly, the right channel amplifier 116 outputs an amplified right channel
signal. This signal is input to the positive terminal of the voice coil 114b of the front center
speaker 106. The negative terminal of the right channel amplifier 116 is connected to the
negative terminal of the voice coil 114 b of the front center speaker 106. Therefore, the left and
right channel signals are connected to the two voice coils 114a and 114b of the front center
speaker 106 in the same phase (synchronously). Therefore, the output of the front center
speaker 106 is the sum of the left and right channel signals (hereinafter referred to as “L + R”).
[0058]
From the positive terminal of the left channel amplifier 112, the amplified left channel signal is
output to the positive terminal of the left speaker 102 through the filter 118. The negative
terminal of the left channel amplifier 112 is connected to the negative terminal of the left
speaker 102. Similarly, the amplified right channel signal is output from the positive terminal of
the right channel amplifier 116 to the positive terminal of the right speaker 104 through the
filter 120. The negative terminal of the right channel amplifier 116 is connected to the negative
terminal of the right speaker 104. Thus, in the embodiment of FIG. 2, the amplified left and right
channel signals are output to the left and right speakers, respectively.
[0059]
The left and right speakers 102 and 104 are preferably band-limited to reproduce only high
frequencies. This is done using the left high pass filter 118 and the right high pass filter 120 as
shown. Since high pass filters 118 and 120 are used for the left and right speakers 102 and 104,
respectively, the sound output of the left and right speakers 102 and 104 can be limited to high
frequencies. By band-limiting the satellite speakers 102, 104 as described above, the primary
frequency range of the vocal energy can be eliminated, as will be described in more detail below
with reference to FIGS. 4A and 4B. Thus, the viewer feels that speech sounds come only from the
front speakers 20 located in the vicinity of the video image. An example of such a high pass filter
will be described in detail later with reference to FIGS. 4A and 4B.
[0060]
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21
The surround sound speaker system 100 also has a rear speaker 108. Input to the rear speaker
108 produces a left-right difference signal (L-R). To provide this difference signal, the positive
terminal of the left channel amplifier 112 outputs the amplified left channel signal to the positive
terminal of the rear speaker 108, and the positive terminal of the right channel amplifier 116
outputs the amplified right channel signal as a rear speaker Output to the negative terminal of
108. The connection to the rear speaker 108 as described above provides the desired (L-R)
difference signal. The rear speaker 108 also has a potentiometer 109. The potentiometer 109
allows the acoustic output of the rear speakers to be adjusted relative to the outputs of the other
speakers of the system. Such output is typically adjusted based on how close the rear speakers
are to the viewer. Those skilled in the art will appreciate that reversing the polarity of the
connection to the rear speaker 108 will result in a (RL) difference signal rather than a (LR)
difference signal. The polarity of the difference signal emitted from the rear speakers does not
significantly affect the performance of the surround sound speaker system 100, so either may be
selected.
[0061]
The surround sound speaker system 100 also comprises a subwoofer 110. The positive terminal
of the left channel amplifier 112 outputs the amplified left channel signal to the positive terminal
of the left subwoofer speaker 122. The negative terminal of the left channel amplifier 112 is
connected to the negative terminal of the left subwoofer speaker 122. Similarly, the positive
terminal of the right channel amplifier 116 outputs the amplified right channel signal to the
positive terminal of the right subwoofer speaker 124. The negative terminal of the right channel
amplifier 116 is connected to the negative terminal of the right subwoofer speaker 124. Thus, in
the embodiment of FIG. 2, the left channel signal drives the left subwoofer speaker 122 and the
right channel signal drives the right subwoofer speaker 124. Thus, the outputs from the left and
right subwoofer speakers are summed acoustically. Those skilled in the art will appreciate that
the center channel speaker 108 may alternatively be utilized to operate over the full frequency
range (including the bass range) to provide a configuration without the subwoofer. .
[0062]
In a variant of the above preferred embodiment, the left and right amplifiers 112, 116 are
integrated into the system. For example, the left and right channel amplifiers 112, 116 are
generally considered to be the output amplifiers commonly used for the audio signal source
throughout this specification, but specifically to form part of the surround sound system 100. It
10-05-2019
22
may be the selected amplifier. Amplifiers 112, 116 of this variation receive low level input
signals from the audio signal source. The amplifiers 112 and 116 further amplify the input signal
and output it to the surround sound speaker system. Output amplifiers 112, 116 may be
incorporated into interconnect module 14 (FIG. 1) to provide such a configuration. The
interconnect module 14 is preferably independently powered to drive the amplifiers 112,116.
The great advantage of this variant is that the output amplifiers 112, 116 can be designed to
match the electrodynamic characteristics of the loudspeakers.
[0063]
One preferred embodiment of the surround sound system 100 has a front center speaker 106.
The front center speaker 106 consists of approximately 50 cubic inches of a sealed enclosure in
which a commercially available 3-inch diameter dual 8-ohm voice coil is available It houses a
dynamic transducer (voice coil electrodynamic transducer). A pair of 100 microfarad capacitors
are serially connected to the respective positive outputs of the left and right channel signals to
provide a crossover function. Front center speaker 106 has an operating bandwidth greater than
about 150 Hz. The rear speaker 108 has a similar structure but uses a single voice coil
transducer rather than a dual voice coil transducer. The rear speaker 108 consists of a closed
enclosure of approximately 50 cubic inches, in which is housed a commercially available 3-inch
diameter single 8-ohm voice coil dynamic transducer. The potentiometer 109 is an 8-ohm 15watt L pad or a 25-ohm 3-watt wire-wound potentiometer. The potentiometer 109 can change
the output level of the rear speaker 108. The 68 microfarad capacitor is connected in series to
the input to the positive terminal of the voice coil, which performs the crossover function. The
nominal frequency band of the rear speakers 108 is 150 Hz to 8 KHz. The rear speakers 108
reproduce the (LR) difference signal as described with reference to FIG. Each of the side speakers
102, 104 consists of a closed enclosure of about 2 cubic inches (about 33 cubic centimeters) in
which a 1.5 inch (3.81 centimeters) diameter plastic with a nominal 4 ohm impedance available
on the market It houses the corn cone tweeter (plastic cone tweeter). A pair of 4.7 microfarad
capacitors are serially connected to the positive inputs to the side speakers 102, 104, which
provide high pass filtering for the left high pass filter 118 and the right high pass filter 120. The
high pass filters 118, 120 cause the output from the side speakers 102, 104 to have a nominal
frequency band of approximately 4 KHz to 15 KHz.
The subwoofer 110 has a conventional two-part enclosure structure that has a nominal 580
cubic inch (about 9504 cubic centimeters) sealing portion and a pair of 5.25 inch (13.34
centimeters) diameter four It consists of a nominally 450 cubic inch (7374 cubic centimeters)
ported portion coupled to an Ohmic voice coil dynamic transducer. A pair of 0.8 mm Henley
inductors (inductors) are connected in series with the positive input to each transducer to
10-05-2019
23
provide a crossover function. The subwoofer bus unit 110 operates in the nominal 50 Hz to 200
Hz frequency band. Note that in each of the above speakers, the crossover network is integrated
into the accompanying speaker enclosure. In addition, band limiting filters 118 and 120 are
integrated into the speakers 102 and 104, respectively. Thus, the band limiting device and the
satellite speakers associated therewith form an integral unit. This has the additional advantage
that the interconnect module 14 of FIG. 1 can be constructed simply from appropriately wired
input and output jacks.
[0064]
FIG. 3A shows a second preferred embodiment of the present invention. The home theater
surround sound speaker system (sometimes referred to as the "surround sound system") 200 of
FIG. 3A comprises similar parts as the surround sound system 100 of FIG. Attached. The
surround sound system 200 of FIG. 3A is substantially the same as that shown in FIG. 2, but the
left side speaker 202 and the right side speaker 204 reproduce the difference signals (L-R) and
(R-L) respectively. It differs in that it is configured. The positive terminal of the left channel
amplifier 212 outputs the amplified left channel signal to the positive terminal of the left side
speaker 202 via the filter 218. The positive terminal of the right channel amplifier 216 outputs
the amplified right channel signal to the negative terminal of the left side speaker 202. Similarly,
the positive terminal of the right channel amplifier 216 outputs the amplified right channel
signal to the positive terminal of the right side speaker 204 via the filter 220. The positive
terminal of the left channel amplifier 212 outputs the amplified left channel signal to the
negative terminal of the right side speaker 204. With such connection, the (LR) difference signal
is input to the left side speaker 202, and the (RL) difference signal is input to the right side
speaker 204.
[0065]
As described in FIG. 1, the left high pass filter 218 and the right high pass filter 220 cancel and
remove low frequency components of the input signal to the left side speaker 202 and the right
side speaker 204, respectively. If the satellite speaker receives the difference signal as an input, it
may be optional (with or without) to provide a high pass filter for the difference signal as shown
in FIG. However, high pass filtering the (L-R) difference signal provides two advantages. First, the
physical size of the side speakers can be reduced. Second, even if the conversation leaks to the
difference signal due to a mismatch in the left and right channel signal gains, band limiting the
difference signal eliminates this leak signal in the main voice frequency range, leading to a
concentration of conversations. The position of the center speaker is fixed. This is true even if the
10-05-2019
24
signals on the left and right channels are not exactly equal and the speech leaks into the
difference signal.
[0066]
In one variation of the second preferred embodiment, inverting the polarity of the difference
signal causes the (L-R) difference signal to be provided to the right side speaker 204 and the (RL) difference signal to be left. It is supplied to the side speaker 202. In another variation, the (LR)
difference signal can be provided to both side speakers 202, 204, or the (RL) difference signal
can be provided to both side speakers 202, 204. . If the difference signal is bandlimited, the
particular polarity of the difference signal provided to the side speakers does not significantly
affect the performance of the system. This is because the side speakers operate at nominally
above about 1 KHz (in the range where the acoustic difference can not be heard). Also, because
the sound signal wavelength in this frequency range is relatively short, a small change in the
relative position of the side speakers 202 and 204 for signal synthesis at the listening position is
that of the signal supplied to both sides. The influence is greater than the relative polarity.
[0067]
The great advantage of driving left side speaker 202 and right side speaker 204 with the
difference signal ((L-R) or (R-L)) is to remove the sound component in which the difference signal
is equally recorded in the left and right channels, It is effective to separate conversation and
environment surround sound playback. Considering a system in which the left and right channel
signals are output to the left and right side satellite speakers, the remaining vocal energy
harmonics (harmonics) remain in the left and right signals at higher frequencies (for example,
overtones) It sounds as When such sizzles are reproduced by the satellite speakers, the satellite
speakers produce directional cues that become unnatural breaths and breaths during
conversation, damaging the acoustic image. However, the difference signal solves these problems
by removing speech energy from the environmental surround sound without trace. Another
advantage is obtained by bandlimiting the difference signal, which contains substantially only
environmental surround sound information. That is, by band-limiting the difference signal,
smaller satellite speakers can be used. This is because satellite speakers need only reproduce
high frequency sound output. Therefore, by band-limiting the difference signal and using it, it is
possible to separate the reproduction of speech and environmental sound. This allows the
conversation to be focused on the video image while maintaining a consistent environmental
sound field. The above separation creates a fundamental difference between the inventive passive
system and the active surround sound decoding system. The passive system of the present
10-05-2019
25
invention does not produce any artificial sound as speech enters and leaves the ambient sound
field recorded on the surround track. Thus, while keeping the conversation focused on the video
screen, a consistent environmental sound field can be created. The connection of the front center
speaker, the subwoofer and the rear speaker in FIG. 3A is the same as that described in FIG. The
left channel amplifier 212 outputs an amplified left channel signal, which is input to the positive
terminal of the voice coil 214 a of the front center speaker 206. The negative terminal of the
voice coil 214 a of the front center speaker 206 is connected to the negative terminal of the left
channel amplifier 212. Similarly, the right channel amplifier 216 outputs an amplified right
channel signal, which is input to the positive terminal of the voice coil 214 b of the front center
speaker 206.
The negative terminal of the voice coil 214 b of the front center speaker 206 is connected to the
negative terminal of the right channel amplifier 216. Thus, the left and right channel signals are
input to the two voice coils 214a and 214b of the front center speaker 206 in phase, and thus
the output of the front center speaker 206 is the sum of left and right signals.
[0068]
Refer again to FIG. 2A (and FIG. 3). The left side speaker 102 (202) and the right side speaker
104 (204) respectively receive the amplified signals outputted from the left and right channel
amplifiers 112 (212) and 116 (216). However, the operating bandwidth of the side speakers 102
(202), 104 (204) is limited. The bandwidth of the side speakers 102 (202), 104 (204) in the
present invention is limited to a frequency range substantially above the main frequency range of
the speech or voice signal output from the front center speaker 106 (206). . More specifically,
the main energy of the speech signal is included in the frequency range of about 150 Hz to 1
KHz. The side speakers 102 (202) and 104 (204) are bandwidth limited by the high pass filters
118 (218) and 120 (220), respectively, and operate at a frequency range of at least about 1 KHz
or more.
[0069]
FIG. 3B shows a modification of the second preferred embodiment of the present invention. The
home theater surround sound speaker system (sometimes referred to as "surround sound
system") 200 'of FIG. 3B comprises similar parts as the surround sound systems 100 and 200 of
FIGS. 2 and 3A, Have the same sign. The surround sound system 200 'of FIG. 3B is substantially
the same as that shown in FIG. 3A, but left side speaker 202 and right side speaker 204 produce
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26
difference signals (L-.beta.R) and (R-.beta.L) respectively. It differs in that it is configured. As
shown in FIG. 3A, the positive terminal of the left channel amplifier 212 outputs the amplified
left channel signal to the positive terminal of the left side speaker 202 via the filter 218. The
positive terminal of the right channel amplifier 216 outputs the amplified right channel signal to
the negative terminal of the left side speaker 202 via the attenuator 270. Similarly, the positive
terminal of the right channel amplifier 216 outputs the amplified right channel signal to the
positive terminal of the right side speaker 204 via the filter 220. The positive terminal of the left
channel amplifier 212 outputs the amplified left channel signal to the negative terminal of the
right side speaker 204 via the attenuator 272.
[0070]
Attenuators 270, 272 reduce the drawn signal before it is input to the negative terminals of side
speakers 202, 204, respectively. Therefore, the difference signal (L-βR) is output from the left
side speaker 202, and the difference signal (R-βL) is output from the right side speaker 204.
Here, β is the gain of each of the attenuators 270 and 272. The gain β of attenuators 270, 272
preferably has a value between 0 and 1. Also, as will be understood by those skilled in the art, the
gain β of the attenuators 270, 272 may be a fixed value or a variable. Whether it is variable or
fixed depends on the application and application example. Furthermore, each attenuator 270,
272 may have a different gain. In this case, attenuator 270 has a gain .beta.1, and attenuator 272
has a gain .beta.2. As those skilled in the art will readily recognize, various forms of attenuators
270, 272 having (provided) gains β are conceivable. For example, for relatively small
configurations, resistors or potentiometers may be used as the amplifiers 270,272. For more
complex configurations, any of a number of amplifiers known to those skilled in the art may be
used as attenuators 270,272.
[0071]
FIG. 4A shows a pair of first order high pass networks for high pass filtering the input signals to
the left side speaker 102 (202) and the right side speaker 104 (204) of FIGS. 2 and 3 . The left
high pass filter 118 (218) and the right high pass filter 120 (220) have capacitors 150 and 152
respectively, and these capacitors 150 and 152 are connected in series to the side speakers 102
(202) and 104 (204) respectively. It is done. Such a filtering structure is referred to as a first
order high pass filter. FIG. 4B shows the left high pass filter 118 (218) and the right high pass
filter 120 (220) provided as a second high pass network. Capacitors 154 and 156 are connected
in series to the positive terminals of side speakers 102 (202) and 104 (204) respectively, and
inductors 158 and 160 are connected between the positive and negative terminals of side
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27
speakers 102 (202) and 104 (204) To connect in parallel). The operation of the high pass
network shown in FIGS. 4A and 4B should be well understood by those skilled in the art and will
not be described here.
[0072]
Those skilled in the art will appreciate that the high pass filters 118 (218), 120 (220) may be any
of many known in the art. It will be readily appreciated that the use of passive high pass filters is
one way to band limit the signal. Those skilled in the art will also appreciate that the cutoff
frequency will vary depending on the application.
[0073]
By bandwidth limiting the frequency range of the input signal to the side speakers 102 (202),
104 (204), the dialog localization cues are substantially removed from the side speakers 102
(202), 104 (204) The main speech concentration cue signal is thus reproduced only by the front
center speaker 106 (206) close to the video image. By bandwidth limiting the side speakers 102
(202), 104 (204), the conversation is concentrated to the location of the front center speaker
106. This is because only the central channel among the speakers of this system is the speaker
that reproduces the basic speech concentration cue signal. The left side speaker 102 (202) and
the right side speaker 104 (204) respectively reproduce high frequency information of the left
and right channels (which is usually higher than the frequency range of the main speech). Thus,
the side speakers 102 (202), 104 (204) serve to enhance the spaciousness without changing the
concentration of the speech sound. Numerous studies on the acoustics of concert halls have
shown that there is a correlation between creating a spacious feel and the presence of side
reflections. That is, there is a correlation between the feeling of spaciousness and the energy
delivered from the side of the listening space to the listening position. With the side speakers
102 (202) and 104 (204) at the sides of the listening room and with the main axis of radiation
directed vertically upwards, the side speakers 102 (202) and 104 (204) are significantly
sideways in the listening position (Side) generate energy. Thus, the feeling of spaciousness can be
strengthened. In addition, the side speakers 102 (202) and 104 (204) of the present invention
are band-limited, and the speech concentration cue signal is made much smaller, so they can be
positioned further to the side of the viewer than conventional speakers. Furthermore, by bandlimiting the side speakers 102 (202) and 104 (204), even if the user moves to the side largely,
the sound image on the side of the viewer is not impaired. If the full frequency range side
speaker is placed in that position, the sound image of the viewer's side will be lost. As a result,
the side speakers can be arranged at positions where the sense of spaciousness is maximized
10-05-2019
28
without generating or forming a disturbed sound image.
[0074]
Another advantage of band-limiting the side speakers is that the physical size of the side
speakers can be relatively small. Banding the side speakers to about 1 KHz or higher can make a
significant difference to typical satellite / subwoofer systems. In most satellite / subwoofer
systems, satellite speakers operate at a fairly large frequency range (typically down to as low as
150 Hz). Thus, such a loudspeaker would be much larger than the inventive side loudspeaker in
order to generate sufficient energy at low frequencies. In the present invention, the side speakers
perform reproduction over a fairly limited frequency range.
[0075]
FIG. 5A shows a front center speaker 106 (206) consisting of dual voice coils 114a, 114b (214a,
214b) and a single transducer 115 (215) as shown in FIGS. The amplified left channel signal is
supplied to the voice coil 114a (214a), and the amplified right channel signal is supplied to the
voice coil 114b (214b). In this configuration, the left and right channel signals are summed
electromagnetically in transducer 115 (215).
[0076]
Another notable advantage of the invention can be obtained in particular with the arrangement
of FIG. 5A. In FIG. 5A, the left and right channel signals respectively output by the amplifiers 112
and 116 are individually supplied to the voice coils 114a and 114b of the transducer 115 to
produce an electromagnetic (L + R) sum signal. Thus, the front center speaker of FIG. 5A
passively generates a sum signal. In this case, there is no need for a resistor divider network
which consumes power, increases the cost of the system and complicates the system. Such power
savings should be particularly noticeable when the present invention derives the left and right
channel signals from a relatively low power (output) amplifier source (eg, a typical stereo
television or boombox portable stereo). is there. Left plus right summation within the
loudspeaker itself eliminates the need for extra (separate) components and the associated costs.
[0077]
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In another center channel configuration shown in FIG. 5B, the left and right channel signals drive
the respective (independent) left and right transducers 117, 119. The amplified signal of the left
channel drives the voice coil 114a (214a), which drives the left transducer 117. The amplified
signal of the right channel drives the voice coil 114 b (214 b), which drives the transducer 119.
[0078]
In the configuration of FIG. 5B, transducers 117 and 119 must be located relatively close. This is
to acoustically sum the outputs from both transducers 117, 119 in the largest possible frequency
range. In order to make an effective acoustic sum, the two transducers must be located within
about one-quarter of the wavelength of each other. Such proximity arrangements can not
practically be performed in the full audio frequency range. At high frequencies, some comb
filtering occurs in the combined acoustic output from the two transducers. In the case of a mono
signal, the two transducers emit the same signal and are spatially separated, so that the
difference in path length between the listening position and each transducer is a large fraction of
the wavelength or at high frequencies, It will be several times the wavelength. Thus, minimizing
the distance between the two parts minimizes the amount of comb filtering that occurs.
[0079]
FIG. 6 shows two alternative embodiments for obtaining the (LR) difference signal from the rear
speakers 108 (208) of FIGS. The difference signal typically includes environmental and surround
sound information. FIG. 6A shows a circuit diagram according to a preferred embodiment for
obtaining a (LR) difference signal in a passive system. The left channel amplifier 112 (212)
outputs an amplified left channel signal, which is input to the positive terminal of the voice coil
130 of the rear speaker 108 (208). The right channel amplifier 116 (216) outputs the amplified
right channel signal to the negative terminal of the voice coil 130. Therefore, the rear speaker
108 (208) outputs a sound corresponding to the difference (LR) between the left and right
channel signals through the transducer 134. FIG. 6B shows a circuit diagram of another
configuration for obtaining the (L-R) difference signal. The rear speaker 108 has dual voice coils
132a, 132b. Voice coil 132a receives the amplified left channel signal from left channel amplifier
112 (212) at its positive terminal. The negative terminal of the voice coil 132a is connected to
the negative terminal of the left channel amplifier 112 (212). Voice coil 132b receives at its
negative terminal the amplified right channel signal from right channel amplifier 116 (216). The
positive terminal of the voice coil 132b is connected to the negative terminal of the right channel
10-05-2019
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amplifier 116 (216). Thus, in this configuration, the polarity of connection and coupling is
reversed and the transducer 134 outputs a (L-R) signal.
[0080]
FIG. 7 illustrates a third preferred embodiment of the present invention in which the home
theater surround sound speaker system 300 performs low level signal processing prior to
amplification by the amplifiers 302,304. The left channel positive signal 306 and the right
channel positive signal 308 are provided to an addition amplifier 310 (which may be any of the
addition amplifiers known in the art for electronically adding the above signals). The output of
the addition amplifier 310 is a (L + R) sum signal, which is input to the power amplifier 302. The
positive output of the amplifier 302 is an amplified (L + R) signal, which is input to the positive
terminal of the center speaker 312. The negative terminal of the central speaker 312 is
connected to the negative terminal of the amplifier 302.
[0081]
The positive terminal of the power amplifier 302 outputs a drive signal to the positive terminal of
the subwoofer 314. The subwoofer 314 consists of a single transducer and a voice coil. Similar to
the center speaker 312, the (L + R) signal drives the subwoofer 314 so that the subwoofer 314
needs only a single voice coil and transducer to output the low frequency portion of the left and
right signals. It will be understood by those skilled in the art that subwoofers of other
constructions can be used in the present invention without substantially affecting the operation
of the system.
[0082]
The surround sound speaker system 300 also actively generates a difference signal. Prior to
amplification by amplifier 304, left channel positive signal 306 and right channel positive signal
308 are provided to subtraction amplifier 316. A left-right (L-R) difference signal is output from
the output terminal of the subtraction amplifier 316. The (L−R) difference signal is input to the
power amplifier 304. The positive output of the power amplifier 304 drives the positive terminal
of the rear speaker 318. The negative terminal of the rear speaker 318 is connected to the
negative terminal of the power amplifier 304. Therefore, the (L−R) difference signal output from
the amplifier 304 drives the rear speaker 318.
10-05-2019
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[0083]
The drive signal is output from the positive terminal of the power amplifier 304 to the positive
terminal of the left side speaker 320 via the high pass filter 324. The negative terminal of the left
side speaker 320 is connected to the negative terminal of the power amplifier 304. Similarly, the
drive signal is output from the positive terminal of the power amplifier 304 to the negative
terminal of the right side speaker 322 through the high pass filter 326. The positive terminal of
the right side speaker 322 is connected to the negative terminal of the power amplifier 304. The
connection to the left side speaker 320 as described above supplies the (L−R) drive signal to the
speaker. Further, by the connection to the right side speaker 322 as described above, the (RL)
signal is supplied to the speaker. The polarities of the signals supplied to each of the left side
speaker 320, the right side speaker 322 and the rear speaker 318 may be reversed, and in this
case, the effect of the present system does not change. The relative polarity relationship of the
difference signal to the two side and rear speakers may be replaced in any way and does not
change the operation and effect of the system. The high pass filters 324, 326 operate in the same
manner as described by FIGS.
[0084]
Such an arrangement is particularly suitable for high power applications and high power
applications. That is, the interconnection module has an internal amplifier, which is suitable for
an application that amplifies the electrical input signal by this internal amplifier and outputs the
amplified electrical signal to drive each speaker. A particular advantage of the internally powered
interconnect module is that the output signals are not synchronized, so that speakers that require
more energy to operate properly can receive higher power input signals The option is to give you
the option of amplification. For example, the sum signal input to the center and bus speakers
may be output at a much higher power level than the difference signal output to the satellite and
rear environment speakers. This can provide high power to drive the bus and front speakers
while leaving low enough power to drive the side and rear speakers. For example, instead of a 10
watt + 10 watt stereo amplifier configuration, an 18 watt + 2 watt amplifier configuration can be
used to more efficiently utilize commonly available power.
[0085]
10-05-2019
32
FIG. 8 shows a fourth preferred embodiment of the present invention. The home theater
surround sound speaker system 400 of FIG. 8 (hereinafter sometimes referred to as “surround
sound system”) has components similar to the components of the surround sound system 100
of FIG. Signed. The surround sound system 400 of FIG. 8 has substantially the same structure as
the system of FIG. 2, but differs in that it receives and outputs monaural signals rather than left
and right channel signals that are components of stereo signals. The surround sound system 400
includes a left side satellite speaker 402 (sometimes referred to as "left side speaker or left
satellite speaker") and a right side satellite speaker 404 (sometimes referred to as "right side
speaker or right satellite speaker") , A front center speaker 406, a surround or rear speaker 408,
and a subwoofer speaker 410. The amplifier 412 receives a monaural signal and outputs an
amplified monaural signal. The amplified monaural signal is input to the positive terminal of the
voice coil 414 of the front center speaker 406. The negative terminal of the voice coil 414 of the
front center speaker 406 is connected to the negative terminal of the amplifier 412. The voice
coil 414 of the front center speaker 406 drives the transducer 415 and causes the front center
speaker 406 to output sound. The positive terminal of the amplifier 412 outputs an amplified
signal to the positive terminal of the left side speaker 402 via the filter 418, and also outputs the
amplified signal to the positive terminal of the right side speaker 404 via the filter 420. As
shown, using the left high pass filter 418 and the right high pass filter 420, the left side speaker
402 and the right side speaker 402 are band-limited and only reproduce high frequencies. The
operations of the left high pass filter 418 and the right high pass filter 420 are as described
above.
[0086]
The surround sound system 400 also has a rear speaker 408. The rear speaker 408 receives the
amplified output from the amplifier 412. The rear speaker 408 has a potentiometer 409, thereby
forming a ground line for the amplified signal input to the rear speaker 408. The potentiometer
409 allows the acoustic output of the rear speaker 408 to be adjusted relative to the outputs of
the other speakers of the system. The rear speaker 408 is preferably adjusted so that the sound
pressure level generated at the viewer's position by the rear speaker 408 is less than the sound
pressure level generated by the front speaker 415 at that position. By doing this, the viewer
perceives the conversation from the front stage based on the order, priority and precedence
effect of sound reproduction. That is, when two similar sounds are emitted, the human listening
process / hearing interprets the direction of the first sound reached as the direction in which the
two sounds are emitted. A psychoacoustic phenomenon known as time-intensity trading causes
the viewer to sense that the higher level sound has arrived earlier. Therefore, by changing the
output from the rear speaker 408 to a level sufficiently lower than the output of the front
speaker 406, the acoustic image seems to be forward, but the acoustic energy from the rear
speaker 408 does not add additional acoustic information. provide. The listening process /
10-05-2019
33
hearing perceives this additional information as environmental or surround sound. It will be
understood by those skilled in the art that level adjustment can be performed by any of a number
of known techniques. Also, since the embodiment of FIG. 8 uses only one channel of
amplification, the viewer typically uses the entire system to achieve the desired sound pressure
level as compared to a stereo system using two channels. Increase the volume of
[0087]
As a modification of the fourth embodiment of FIG. 8, the same effect is obtained even when a
monaural signal is supplied to the amplifier 212 without supplying the input signal to the
positive input of the amplifier 216 in the configuration of FIG. 3A. Be Similarly in this variation, a
surround sound effect can be obtained based on the monaural input signal, so that the surround
sound system shown in FIG. 3A can be used for both stereo and monaural signals. That is, the
application range of the system of FIG. 3A can be expanded.
[0088]
A particularly desirable feature in most surround sound systems is the ease of installation and
operation. This is to prevent an amateur user from hesitateing to purchase or use it. The present
invention solves most installation difficulties by providing a connection jack on the
interconnection module 14 for the home theater. By providing a connection jack, the surround
sound system has only one or a set of speaker connections in the configuration where the (LR)
difference signal is output to the side speakers. FIG. 9 is a wiring diagram showing the
interconnection jacks in the interconnection module 14 of FIG. 1, which will be described below
based on the components described in FIG.
[0089]
The interconnect module 14 includes a four-terminal input jack 30 for receiving left and right
channel signals (component signals) input from the television 12 to the interconnect module 14.
The left and right channel signals are received via four conductors extending to a four terminal
connector suitably coupled to a four terminal input jack 30. The negative inputs of the left and
right channels are tied together in the interconnection module 14 and used as a common ground
signal for each of the input and output connections. The output to the front center speaker 20
(FIG. 1) is provided via a three terminal output jack 32. The three terminals of the three terminal
10-05-2019
34
output jack 32 provide an output consisting of a left channel signal, a right channel signal and a
common ground signal. The second three terminal subwoofer output jack 34 provides a similar
output signal to the subwoofer 18. The subwoofer output jack 34 similarly supplies the left
channel signal, the right channel signal and the common ground signal to the respective
terminals.
[0090]
The three two-terminal output jacks 36a, 36b, 36c supply the left channel signal to one terminal
and the right channel signal to the other terminal. Each of these jacks is connected to a cable
connected to one of the rear speaker 26, the left satellite speaker 22 and the right satellite
speaker 24. The signals supplied to these speakers are left-right difference signals. Thus, the
configuration of the interconnection module 14 is particularly suited to the preferred
embodiment shown in FIG. 3A where the left satellite speaker 22, the right satellite speaker 24
and the rear speaker 26 receive the difference signal as input. Those skilled in the art will
appreciate that the output jacks 36a, 36b, 36c can be interchanged. This is because each jack
outputs substantially the same signal.
[0091]
One of the great features of the interconnection module 14 is that the front center speaker
output jack 32 and the subwoofer output jack 34 may be the same jack that outputs the same
signal to each terminal. Thus, during installation, the operator can assemble the system in only
one way. The operator can not connect the cable connector (not shown) for the front center
speaker 20 or the rear speaker 26 to one of the output jacks 36a, 36b, 36c. Similarly, the output
jacks 36a, 36b, 36c supply the same signal to each terminal. That is, all similarly configured
output (and input) jacks provide (receive) the same signal. Similarly, the operator can not connect
the cable connector for the satellite or rear speaker to the front center speaker output jack 32 or
the subwoofer output jack 34. The operator can connect the cable connector to only one of a
plurality of jacks that output an appropriate signal for a particular speaker. In addition, the
operation of the present invention facilitates the construction and assembly of the
interconnection module 14 and facilitates the installation. Another advantageous feature of the
invention is that the interconnection module 14 is particularly adapted to standard 2, 3 and 4
conductor cables which facilitate (enable) low cost manufacture. Because these parts are easily
available.
10-05-2019
35
[0092]
The improvement of any home theater surround sound speaker system can be achieved by
reducing the number of parts. One way to reduce the number of parts is to consolidate the parts
where possible. For example, referring to FIG. 1, the interconnection module 14 and the
subwoofer 18 can theoretically be integrated into one piece. FIG. 10 shows a configuration
(modification) in which the components of the home theater surround sound speaker system 10
of FIG. 1 are integrated as described above. The configuration of the home theater surround
sound speaker system (sometimes referred to as "surround sound system") 10 'of FIG. 10 is
substantially the same as that of FIG. 1, and like parts have been labeled with like numerals. As
shown in FIG. 10, the television 12 outputs audio signals to the integrated interconnect module
and subwoofer bus speaker (integrated bus unit) 40. The integrated bus unit 40 acts as both the
interconnect module 14 and the subwoofer 18 of FIG. The interconnection module 14 is housed
and integrated into the housing of the subwoofer bass speaker, reducing parts count and wiring,
thus facilitating assembly. The integrated bus unit 40 has interconnects that distribute the
appropriate signals to each of the front center speaker 20, the left satellite speaker 22, the right
satellite speaker 24 and the rear environment speaker 26. The integrated bus unit 40 also has a
subwoofer wired directly to the interconnection circuitry contained in the integrated bus unit 40.
Thus, in this system the number of cables is one less (there is no cable between the
interconnection module and the subwoofer bass speaker). Also, the number of independent parts
is one less (the interconnection modules are not provided in a separate and independent
manner).
[0093]
FIG. 11 shows a perspective view of an example of the integrated bus unit 40. The integrated bus
unit 40 comprises an interconnection module 42 having input and output jacks. Input and output
jacks receive the incoming audio signal and distribute the left, right and difference signals to the
appropriate speakers. The interconnect module 42 has a four terminal input jack 44 for receiving
left and right channel signals via four conductors. The interconnect module 42 also has one
three-terminal center speaker output jack 46 and three two-terminal output jacks 48a, 48b, 48c.
This interconnection module 42 has substantially the same configuration as the interconnection
module 14 of FIG. 9, and the principle described in FIG. 9 is equally applicable to that of FIG.
[0094]
10-05-2019
36
One major difference between the interconnection module 42 of FIG. 12 and the interconnection
module 14 of FIG. 9 is that the interconnection module 42 is integrated with the subwoofer bus
speaker so that the interconnection module 42 has a subwoofer output jack. It is not necessary
(the interconnection module 14 of FIG. 9 requires it). The left channel signal, right channel signal
and common ground signal are provided directly to the crossover network of the integrated
subwoofer unit 40.
[0095]
The good working effects according to another variant of the invention make common problems
with many typical consumer audio-visual rooms (the inability to easily connect interconnection
modules to satellite speakers and rear environment speakers) Is solved. Typically, for the wiring
connection of a home theater surround sound system, provide a cable along the side wall or back
wall of the room, or drill a hole under the floor or floor to make the cable under the floor It is
necessary to pull in and then pull the cable from under the floor into the room again at the
location of each speaker.
[0096]
As shown in FIG. 13, the present invention is particularly suitable for a wireless home theater
surround sound speaker communication system 50. The television (TV) 51 supplies the left and
right channels of the stereo audio signal to the interconnection module 52. The interconnection
module 52 constructs a desired system by supplying left and right channel signals to appropriate
speakers. In the embodiment shown in FIG. 13, the interconnection module 52 is wired directly
to the television 51, the front center speaker 54 and the subwoofer 70. The interconnect module
52 includes a transmitter 56 that transmits the audio signal to the left satellite speaker 64, the
right satellite speaker 66 and the rear environment speaker 68 in order to transmit the audio
signal to the appropriate speakers. Each of the speakers 64, 66, 68 has a receiver 56 'that
receives the output signal provided wirelessly by the transmitter 56 of the interconnection
module 52. The receiver 56 'receives the supplied signal and converts it to an audio signal
suitable for the loudspeaker. It will be appreciated by one skilled in the art that the receiver 56
'may be configured to output the converted signal to an amplifier prior to supplying it to a
speaker.
[0097]
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37
The transmitter 56 and the receiver 56 'preferably operate in one channel. In order to use a onechannel transmitter / receiver structure, interconnect module 52 preferably outputs only one
audio signal to each speaker. In such a desirable configuration, the home theater surround sound
speaker system 300 of FIG. 7 is the preferred embodiment for implementing the wireless
surround sound system 50 of FIG. In such an embodiment, interconnection module 52 performs
active signal addition and subtraction (as described in FIG. 7) to generate difference and sum
signals prior to transmission to the respective speakers. According to this configuration, the
wireless system can be limited to single-channel communication instead of multi-channel
communication. Furthermore, one skilled in the art will appreciate that the left satellite speaker
320, the right satellite speaker 322 and the rear speaker 318 can be driven by substantially the
same difference signal, so that the interconnection module 52 is a single transmitter (eg 56). It
will be appreciated that the transmitter can be used to provide the drive audio signal to each
speaker. This enables considerable cost reduction. It will also be appreciated by those skilled in
the art that the speakers can be wirelessly connected as well as the wired connection described
above using similarly configured receivers and transmitters.
[0098]
From the above description, it will be appreciated that the present invention can solve some
problems of the prior art and achieve the object of the present invention. Thus, the present
invention can provide a home theater surround sound system that is effective (efficient and
capable), low cost, and easy to install. The front, rear, left, right and bass speakers produce the
desired sound output in response to the provision of the appropriate sum and difference signals
produced by the combination of the left and right channel signals of the stereo signal. The sum
and difference signals cause desired speech and environmental sounds to be output from
appropriate speakers.
[0099]
Although the present invention has been described above based on the specific preferred
embodiments, variations and modifications thereto can be made within the spirit and scope of
the claims.
[0100]
Brief description of the drawings
10-05-2019
38
[0101]
FIG. 1 is a block diagram of a home theater surround sound speaker system arranged in
accordance with the principles of the present invention.
[0102]
Figure 2 is an enlarged block diagram of a first preferred embodiment of the home theater
surround sound speaker system of Figure 1;
[0103]
FIG. 7 is an enlarged block diagram of a third preferred embodiment of the home theater
surround sound speaker system showing the case where the difference and sum signals of the
left and right channels are actively generated before being output to the speaker. ing.
[0104]
FIG. 8 is an enlarged block diagram of a fourth preferred embodiment of the home theater
surround sound speaker system, illustrating the case where a monaural signal is output to each
speaker.
[0105]
FIG. 9 is a schematic of an interconnection module for the above system used to ensure that the
home theater surround sound speaker system can be installed and operated.
[0106]
FIG. 10 is a block diagram showing a modification of the home theater surround sound speaker
system of FIG. 1;
[0107]
FIG. 11 is a perspective view of an integrated subwoofer bus unit and an interconnection module
(a perspective view of a configuration in which the subwoofer bus unit and the interconnection
module are integrated).
[0108]
FIG. 12 is a schematic of an interconnect module integrated with a subwoofer bus unit for the
system of FIG. 11 used to ensure installation and operation of the home theater surround sound
10-05-2019
39
speaker system.
[0109]
FIG. 13 is a block diagram of the case where the home theater surround sound speaker system is
made wireless.
[0110]
Explanation of sign
[0111]
10 home theater surround sound speaker system 12 television 14 interconnection module 18
subwoofer 20 front center speaker 22 left satellite speaker 24 right satellite speaker 26 rear
environment speaker 28 viewer 40 integrated type bus unit 51 television 52 interconnection
module 54 front center Speaker 56 Transmitter 56 'Receiver 64 Left Satellite Speaker 66 Right
Satellite Speaker 68 Rear Environment Speaker 70 Subwoofer 100 Home Theater Surround
Sound Speaker System 102 Left Satellite Speaker 104 Right Satellite Speaker 106 Front Center
Speaker 108 Rear Speaker 110 Subwoofer Speaker 122 Left Subwoofer Speaker 124 Right
Subwoofer Speaker 200 Home Theater Surround Sound Speaker system 202 left side speaker
204 right side speaker 206 center speaker 208 rear speaker 300 home theater surround sound
speaker system 306 left channel positive signal 308 right channel positive signal 312 center
speaker 314 subwoofer 318 rear speaker 320 left side speaker 322 right side speaker 400
Home Theater Surround Sound Speaker System 402 Left Side Satellite Speaker 404 Right Side
Satellite Speaker 406 Center Speaker 408 Rear Speaker 410 Subwoofer Speaker
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