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JP2003204597

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2003204597
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus in which a plurality of speakers are provided in one housing.
[0002]
2. Description of the Related Art In U.S. Pat. No. 6,069,962, a speaker apparatus is proposed in
which a plurality of speakers are provided in one housing and these speakers reproduce stereo
images. FIG. 5 is a plan view of such a speaker apparatus, wherein a center speaker unit 101 for
reproducing L + R components on the front, a speaker unit 102 for L channel for reproducing LR components on the left, and R for reproducing R-L components on the right A channel speaker
unit 103 is provided. As illustrated, the vibration axes of the L channel and R channel speaker
units 102 and 103 are disposed at an angle of 45 degrees toward the listener. Reflecting walls
104 and 105 are provided in parallel with the vibration axes of the L channel and R channel
speaker units 102 and 103, respectively.
[0003]
Therefore, the synthetic sound of the reproduced sound from the L channel speaker unit 102 and
the reproduced sound reflected by the reflecting wall 104 is in the direction of the arrow A
which is the front from the virtual point 106 and in the direction of the arrow B which is 90
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1
degrees. The synthetic sound of the reproduced sound of the R channel speaker unit 103 and the
reproduced sound reflected by the reflecting wall 105 is emitted in the arrow C direction
opposite to the arrow B direction. With this configuration, a stereo image can be sufficiently
obtained even if the distance between the speaker units 102 and 103 is short.
[0004]
Since the L + R component is input to the center speaker unit 101, the input signal becomes large
compared to the other speaker units 102 and 103, and the load is greatest. Therefore, it is
conceivable to adopt a speaker unit having a large aperture and a large input resistance as the
center speaker unit 101, but since the reproduction capability of the high region decreases with
the increase of the aperture, it becomes necessary to add a tweeter , It will be disadvantageous in
cost.
[0005]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention is directed to a plurality of speaker units disposed on a first baffle plate for
reproducing L + R signals, and for reproducing L-R signals, A second speaker unit disposed on
the second baffle plate so as to be disposed at an angle of 45 degrees to the left with respect to
the first speaker unit; reproducing an R-L signal; The third speaker unit disposed on the third
baffle plate, the first reflecting wall disposed substantially orthogonal to the second baffle plate,
and the And a second reflecting wall disposed substantially orthogonal to the third baffle plate.
[0006]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in
detail below based on the embodiments shown in the drawings.
Dolby Digital, a multi-channel surround system, has three front channels consisting of front L
channels, front R channels and front center channels, two rear channels consisting of rear L
channels and rear R channels, and a subwoofer 1 It is necessary to prepare speakers for 6
channels in total.
[0007]
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2
The enclosure 200 shown in FIGS. 1 and 2 is used on the front side and the rear side. FIG. 1 is a
plan view of the enclosure 200, and FIG. 2 is a left side view thereof. The front baffle plate 209 is
provided with center speaker units 201 and 202 for reproducing an L + R component. The L
channel speaker unit 203 for reproducing L-R components is disposed on the baffle plate 210
disposed at an angle of 45 degrees with respect to the baffle plate 209, so that the vibration axis
of the L channel speaker unit 203 is It is disposed at an angle of 45 degrees with respect to the
center speaker units 201 and 202.
[0008]
On the right side, an R channel speaker unit 204 for reproducing the R-L component is similarly
disposed at an angle of 45 degrees with respect to the center speaker units 201 and 202.
Accordingly, the speaker units 203 and 204 are arranged such that their vibration axes are at an
angle of about 90 degrees. Reflecting walls 207 and 208 are provided parallel to the vibration
axes of the L channel and R channel speaker units 203 and 204, respectively.
[0009]
The speaker units 203 and 204 are disposed closer to the virtual point 206 than the lateral
center lines 212 and 213 (the center line 212 is indicated by a dotted line in FIG. 2) of the baffle
plates 210 and 211. With this arrangement, the ratio of reflected sound from the speaker units
203 and 204 being reflected by the reflection plates 207 and 208 increases, so that the
reproduced sound from the speaker units 203 and 204 is directed from the virtual point 206 in
the directions of arrows B and C. The rate of radiation increases. As a result, it is possible to
obtain reproduced sound with a good sense of localization.
[0010]
The above speaker units 201 to 204 all use a unit of the same shape. Further, since the center
speaker units 201 and 202 are connected in parallel, for example, when the impedance of the
speaker units 203 and 204 is 8Ω, the impedance of the center speaker units 201 and 202 is
16Ω.
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3
[0011]
FIG. 3 is a plan view showing a state in which the enclosure 200 is arranged with respect to the
listener 13. The DVD player 20 and the AV amplifier 21 are connected by an optical cable, and
when the DVD is loaded on the DVD player 20, a 5.1 channel audio signal before being decoded
and a video signal is input to the AV amplifier 21. The AV amplifier 21 decodes the audio signal
from the DVD player 20 and converts it into an audio signal of 5.1 channel, and then outputs it to
the signal processing device 30. On the other hand, when a CD is loaded on the DVD player 20,
audio signals of two channels are output to the AV amplifier 21. It is to be noted that a device
such as a display and the like related to video is not directly related to the present invention, and
therefore the description thereof is omitted.
[0012]
The signal processing device 30 is connected to the rear enclosure 100 identical to the front
enclosure 200, the subwoofer 204 and the front enclosure 200 by cables 22, 23, 24 respectively.
By connecting the signal processing device 30 and the enclosures 100 and 200 with a 6-core
cable, the signal processing device 30 and the front enclosure 200, and the signal processing
device 30 and the rear enclosure 100 are connected with a single cable Is possible. Therefore,
the number of speaker cables is significantly reduced as compared with the case where the
speakers are installed at the corners of the room, and the appearance of the room is not
impaired. In addition, since a 5.1 channel system can be constructed by a total of three speaker
enclosures, that is, the front enclosure 200, the rear enclosure 100, and the subwoofer 204, the
number of speakers can be reduced.
[0013]
FIG. 6 is a block diagram of the signal processing device 30. As shown in FIG. An L channel signal
in a stereo output signal of a CD player, a tuner or the like is input to an L-in terminal 31, and an
R channel signal is input to an R-in terminal 32. These two signals are added by the adding
circuit 40 to be an L + R signal, pass through the adding circuit 41 and pass through the low pass
filter (hereinafter referred to as LPF) 42 to remove high frequency components of about 2 KHz or
more, and then for gain adjustment The signal is input to the amplifier 62 via the variable
resistor 43 and reproduced from the center speakers 201 and 202 connected in parallel.
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4
[0014]
An L-R signal generated by subtracting the R channel signal whose level is adjusted by the
variable resistor 46 from the L channel signal input to the L-in terminal 31 by the subtractor 47
is amplified by the amplifier 61, It is reproduced by the L channel speaker 203. Similarly, an R-L
signal generated by subtracting an L-channel signal whose level is adjusted by the variable
resistor 48 from the R-channel signal input to the R-in terminal 32 by the subtractor 49 is output
by the amplifier 63. The signal is amplified and reproduced by the R channel speaker 204.
[0015]
The L channel signal and the R channel signal are added by the adding circuit 50, and after a low
frequency signal of 150 Hz or less is extracted by the LPF 51, it is amplified by the amplifier 64
through the variable resistor 55 for gain adjustment, and then the subwoofer Reproduced by
205.
[0016]
Therefore, the L-R signal is reproduced by the speaker 203, the low and middle frequency
components of the L + R signal are reproduced by the speakers 201 and 202, the R-L signal is
reproduced by the speaker 204, and the low frequency component of the L + R signal is
reproduced by the subwoofer 205 .
With the above signal processing, the R channel signal in antiphase to the L channel signal is
added, and the L channel signal in antiphase to the R channel signal is added. Sound space can be
reproduced.
[0017]
When high frequency components of the L + R signal are output from the center speakers 201
and 202, the sound image is concentrated in the vicinity of the center speakers 201 and 202,
and the stereo image becomes poor. Therefore, as in the above embodiment, the L + R signal
passes through the LPF 42. The high frequency component of about 2 KHz or more is prevented
from being reproduced from the center speakers 201 and 202.
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5
[0018]
Since the addition signal of the L channel signal and the R channel signal is output to the center
speaker units 201 and 202, the level of the input signal is larger than that of the L channel
speaker 203 and the R channel speaker 204.
Therefore, the distortion due to the input over to the center speaker unit at the time of large
volume reproduction can be prevented by setting the speaker unit to two and increasing the
margin for the input resistance. In addition, since a large-aperture speaker is not used to increase
input resistance, high-volume reproduction can be performed without sacrificing high-frequency
characteristics of the speaker units 201 and 202.
[0019]
Although the above description is the circuit operation in the case of reproducing a two-channel
audio signal, the apparatus can also input a Dolby Digital 5.1 channel signal. In this case, the
output signal of the AV amplifier 21 is added to the L-in terminal 31 and the R-in terminal 32
described above, the center channel signal on the front side is on the C-in terminal 33, and the L
channel signal on the rear side is RL-in. A rear side R channel signal is input to the terminal 34, a
subwoofer signal is input to the sub-in terminal 36 to the RR-in terminal 35.
[0020]
Since the C-in terminal 33 is connected to the adder 41, the center channel signal of the Dolby
digital signal is added to the above-mentioned L + R signal, and after the high frequency
component is removed by the LPF 42, the center speaker unit 201, 202 Be regenerated. On the
other hand, the L-in terminal 31, the R-in terminal 33, and the C-in terminal 32 are connected to
the adding circuit 50, whereby the front three channel signals are added. A low frequency signal
of about 150 Hz or less in the addition signal is extracted by the LPF 51 and connected to the
amplifier 64 through the variable resistor 55 for gain adjustment.
[0021]
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Therefore, not only the subwoofer signal input to the Sub-in terminal 36 but also the low
frequency components included in the front L channel, the front center channel, and the front R
channel are reproduced by the subwoofer 205, so they are used for the enclosures 100 and 200.
It is possible to reduce the diameter of the speaker units 201 to 204. For example, when the bass
component is included only in the front L channel, the bass should normally be reproduced from
the front left side, but since human beings can not distinguish the directivity of the bass
component, it is arranged at an arbitrary position. Even if this bass is played back from the
subwoofer, there is no discomfort.
[0022]
In the above embodiment, the low frequency components included in the subwoofer signal, the
front L channel, the front center channel, and the front R channel are reproduced by the
subwoofer 204. Therefore, if only the subwoofer channels contain low-frequency signals, reduce
the volume reduction of the bass reproduced from the subwoofer compared to adding the lowfrequency components of all channels and adding them to the subwoofer channels. Can.
[0023]
After the rear L channel signal and rear R channel signal input to the RL-in terminal 33 and the
RR-in terminal 34 are added by the adder 82, high frequency components of 2 KHz or higher are
removed by the LPF 83, and they are used for gain adjustment. After being amplified by the
amplifier 92 through the variable resistor 84, the signal is reproduced from the center speaker
units 201 and 202.
[0024]
Further, the rear R channel signal is brought to a predetermined level by the variable resistor 85
for gain adjustment, and is then subtracted from the rear L channel signal by the subtractor 86,
whereby an L-R signal on the rear channel side is generated. .
The L-R signal is amplified by the amplifier 91 and reproduced by the speaker unit 203.
Similarly, the rear L channel signal is brought to a predetermined level by the variable resistor 87
for gain adjustment, and then subtracted from the rear R channel signal by the subtracter 88 to
generate an R-L signal on the rear channel side. Be done. The R-L signal is amplified by the
amplifier 93 and reproduced by the speaker unit 204.
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7
[0025]
As with the front side, the L-channel speaker 203 reproduces the anti-phase component of the Rchannel signal, and the R-channel speaker 204 reproduces the anti-phase component of the Lchannel signal. Similarly, even if the distance between the speaker units 203 and 204 is narrow,
the sound image can be diffused in a wider range, and a wide stereo image can be reproduced.
[0026]
In the above-described embodiment, the low frequency components included in the subwoofer
signal, the front L channel, the front center channel, and the front R channel are added by the
adding circuit 50 and reproduced by the subwoofer 204. It is also possible to eliminate the
addition circuit 50, add only the subwoofer channel signal to the subwoofer, and reproduce the
low frequency component of the signal input to each other speaker unit.
[0027]
In the above embodiment, the L-R signal is generated by subtracting the gain-adjusted R signal
from the L-channel signal. However, depending on the speaker unit used and the environment of
the room to be reproduced, for example, the L-channel Subtraction processing or addition
processing may be performed with frequency characteristics, such as generation of an L-R signal
by subtracting the middle band signal of the R channel from the signal.
[0028]
Further, in the above embodiment, the speaker units 203 and 204 are disposed at an angle of 45
degrees to the left and right with respect to the vibration axes of the speaker units 201 and 202,
respectively. Some changes in angle are acceptable as long as they are emitted.
[0029]
As described above, according to the present invention, since a plurality of speaker units for
reproducing the L + R signal to which the addition component is input is provided, the input
resistance can be increased, and the reproduction frequency characteristic is not deteriorated.
Therefore, it is possible to construct a small-sized and cost-effective speaker device.
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