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JPS50110622

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DESCRIPTION JPS50110622
(Ц 2,0DD) Patent application 1, title 2 of the invention, same as inventor patent applicant 6,
patent applicant John G. fist Darchist 4, agent specification [phase] Japan Patent Office ? JPA 50
-1106220 published Nissho 5Q, (1975) 8.30 Japanese Patent Application Sho Guder // i7
[phase] Application date Sho 42. (1974), z, and unsolicited request for review (9 pages in total)
Divide the agency serial number / ?? Ij into at least 3 separate frequency bands. ? Title of the
Invention ? Title of the Invention Compound Driver, Dynamic Speaker
7 Answer Driver Dynamic Speaker
3. Detailed Description of the Invention The present invention is in the field of high fidelity sound
reproduction, and in particular relates to a high fidelity loudspeaker assembly of wide area
dynamic type with multiple drivers. The audio playback device consists of two or more so-called
dynamic or permanent transducers, each of which splits the output of the audio amplifier into
frequency bands, and in this way It is known to connect a band connected to a frequency divider
circuit or crossover which serves to supply a band to the respective converter specifically
provided for regenerating such a band. A typical loudspeaker assembly of this type includes an
enclosure or chamber with or without venting means, and the front of the enclosure constitutes a
baffle or plate to which the EndPage: 1 transducer is mechanically coupled. There are holes in
the baffle for transmitting sound. In order to facilitate the understanding of the present
invention, an exemplary compound using an IC, a wide area divergence transducer or a cone or
dome (but not a horn) loudspeaker and thus the diaphragm is directly coupled to the air load It
will be described that the transducer-speaker assembly utilizes a box, enclosure or chamber front
plate, front wall or direct coupling between baffle and driver. In a typical converter, the bolted
attachment to the inner or outer wall of the baffle includes a perforated metal ring or rim on the
outside. The woofer or bass regenerator may be placed in another enclosure where the front wall
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is made up of the front baffle, or l: <or another auxiliary enclosure, but even in that case each
auxiliary enclosure Use the front baffle means. Although substantial efforts have been made so
far to improve the dual-type loudspeaker system, these systems have been subject to a lack of
coherence as described more or less below. As means of research conducted so far, it has been
considered to use id various porting devices, an air coupling mechanism, a diaphragm and a
means for damping or controlling the encrosic vibration or the like. Despite improvements made
to the design of the enclosure and the design of the transducer, the mechanism so far is that
common listeners like the 'boxy J (bocin?ss) or compression' that common listeners notice
immediately with excellent listeners The Although there are electrostatic loudspeakers that can
generate more or less coherent speech without the above mentioned unpleasant distortions,
electrostatic loudspeakers necessarily have certain drawbacks that reduce their widespread use,
ie high initial costs There is a need for a large, fragile, well-regulated supply of DC power, a need
for proximity to electrical output, and so on.
The inventor has found that many deficiencies in prior loudspeaker systems are not due to the
flaws of the transducer itself (rather than due to the manner of loudspeaker attachment). It has
been found that the lack of speech coherence in this type of system is largely attributable to what
should be termed "bubble propagation effects". For the sake of explanation of the word "bufful
propagation effect", if a moving coil speaker or a wide divergence transducer is to be held in free
space, for example an "at" t-dome shaped waver that propagates a timbre of 1000 Hz, a dome
shape or It can be seen that the timbre is audible regardless of whether the diaphragm driver is
facing the listener. It can also be said that at such frequencies the driver has omnidirectional
propagation characteristics. However, if you install the same driver on a baffle or surface (a
baffle system currently in widespread use today) that is relatively rigid and is substantially larger
than the loudspeaker diaphragm itself, it propagates freely from the back of the transducer The
4-can be done is limited to the forward hemisphere beyond the broad range defined by the
baffles. According to the present inventors, it is known that according to the baffled transducers,
discontinuities such as raised parts or a high propagating in all directions outward along the
surface of the baffle until the end or end of the baffle is encountered. It has been found that
intense speech fields occur. Furthermore, such discontinuities, diffraction occurs at the end or
end, and this diffraction causes the generation of a secondary virtual sound source at the
discontinuities, at the end or end, and this secondary sound source is unavoidable. It has also
been discovered that delay distortion may occur in audio signals. Clearly, the sound directly
transmitted from the diaphragm and the one from the secondary sound source are transmitted to
the listener's ear at different time intervals because the secondary sound source is displaced from
the diaphragm. This conventional baffle installation is an element on the basis of the absence of
? coherence in shaped loudspeaker systems. The so-called baffle propagation effect produces an
added EndPage: two-way distortion in the audio signal, which reduces the naturalness of the
reproduced sound. In particular, it has been found that secondary propagation sources are
"frequency dependent". That is, the secondary propagation source emphasizes only one
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frequency and the other. Thus, if a baffled transducer emits equal intensity at a mixed frequency
of, for example, 4000-6000 Hz, then the propagation characteristics of the baffles and secondary
sound source will emit a tone of 4000 H2 with an efficiency much greater than 6000 Hz. The
music balance will be different.
Yet another difficulty in baffled plate propagation is the high intensity energy transmitted by one
transducer along the baffled surface is the cone shape or voice of all other transducers placed in
the same baffle. Since the vibration applied to the diaphragm collides with the coil structure, it
must also affect the voice coil, causing intermodulation distortion or microphonics generation.
The inventor has found that the sound reproduction characteristics of the multi-speaker and the
wide divergence set can be remarkably improved by the speaker, in particular, other than one for
low-pitched sound reproduction, that is, sound of about 4 ░ to 500 H2. In addition, the
generation of delay distortion caused by the baffle installation of the middle and high frequency
regenerators, especially when combined with or combined with compensation for differences in
the rise time characteristics of the loudspeaker, reduces other causes of delay distortion and is
the most effective It is also possible to create a combined loudspeaker assembly that is more
reliable, wider in divergence and substantially less expensive than such electrostatic
loudspeakers with sound reproduction characteristics comparable to those of electrostatic
loudspeakers. found. The invention can also be summarized as for coherent sources with
complex wide-area diverging drivers in dynamic form, but with the driver in a wide-area
diverging form (as opposed to the horn form of an air coupled system) is there. The assembly
uses a conventional woofer or bass transducer, and S-s are attached to another enclosure, which
preferably constitutes part of the assembly, h2. . In addition to the enclosure within the body 7-at least one additional wide-range diverging dynamic transducer is arranged. It is a feature of the
invention that the at least one additional transducer is substantially completely enclosed in free
space. Preferably, the propagation diaphragm element of the bass propagation generator and the
transducer including the free space are further mutually displaced in the direction of the
listening axis, so that the rise time between the transducers (even if changes occur in both
transducers) The simultaneously applied electrical signals generate sound impulses which
simultaneously reach the listener's ear. Accordingly, it is an object of the present invention to
provide an improved complex transducer dynamic loudspeaker assembly. Another object of the
present invention is to provide a loudspeaker assembly of the type described which can provide a
coherent sound source. Furthermore, another object of the present invention is the use of a widearea diverging transducer element as described above, which can provide high fidelity, clear and
less distorted speech reproduction than the conventionally known dynamic type eight-beak
assembly. It is an object of the present invention to provide a complex transducer speaker
assembly of the type.
Another object of the present invention is to provide an improved loudspeaker assembly of the
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type described which is capable of producing more accurate sound image effects than
loudspeakers of conventional design. Yet another object of the present invention is a loudspeaker
assembly of the type described which can generate an audio signal which is not influenced by
factors which reduce the coherence of the sound, ie delay distortion, intermodulation distortion,
the occurrence of diffraction or other similar conditions. They are offering their bodies. Yet
another object of the invention is a loudspeaker assembly of the above type in which the
midrange frequencies and the trebleband frequencies are emitted by a wide-area diverging
dynamic transducer mounted free space in the acoustically transparent part of the assembly. In
providing the body.
7 Answer Driver Dynamic Speaker
The detailed description of the present invention will be given below according to the drawings.
EndPage: 3 In order to clarify the explanation, it will be convenient to put the definitions of main
terms below. The term "transducer" or "direct propagation dynamic transducer J, as used in the
text of the present application, represents a diaphragm, cone or dome permanent magnet
loudspeaker distinguished from electrostatic loudspeakers or horn load drivers. I assume.
"Interfering voice" refers to an audio signal having complex information bits, wherein the
information bits heard in the listener's ear reach in the same temporal relationship as the
electrical energy input to the loudspeaker assembly, ie the occurrence of distortion, in particular
delay distortion Almost no border from the occurrence of ?delay distortion j in the
loudspeaker? refers to the distortion of the complex waveform (rather than sinusoidal) resulting
from the lack of synchronization of the energy output of the different drivers in the frequency
division loudspeaker system. The total energy output of the delayed distortion signal may be the
same as that of the undistorted signal, but the waveform generated from the distorted signal is
different from that of the original signal. Some delay distortion is included in the energy output
of even a single unbuffled transducer, but the occurrence of such distortion is relatively small in
the middle of the band of the loudspeaker, at the top and bottom of the band It increases as it
becomes. As used herein, "rise time" should be understood to indicate the delay between a
transducer's diaphragm and its application of voltage to the transducer and the voltage that
occurs in all the transducers. Of the accompanying drawings, FIG. 1 shows a baffle plate B having
a conventional transducer 11, in this case a dome-shaped regenerator, in a suitable hole 10. Plate
B may be formed as a front wall of a speaker enclosure whose side walls W and W are
representatively shown. As is well known and already known for all the conversions 2 described
below, the propagation diaphragm, dome or cone of the converter 11 is one of the conductors
provided in the high-intensity magnetic field or It is mechanically connected to a voice coil 11-yl
consisting of more turns. The diaphragm and the coil are generally supported to be able to move
back and forth in a direction parallel to the listening axis L-L. When an audible signal is applied
to the voice coil, the diaphragm is moved to generate sound energy which propagates at P in the
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direction shown. The present inventors use the baffle 11 to attach the transducer 11 in a known
manner, and the energy generated from the front of the speaker, i.e., the energy generated from
the front of the speaker, propagates radially if there is no such baffle. Propagates along the
surface S of the baffle B in the form represented by the wave fronts 12 and 13.
When highly concentrated speech energy reaches the end 14 and 15 of the baffle or the failure /
junction or junction of the baffle surface, a secondary propagation sound source like P or P is
generated to transmit and propagate the sound wave. Generate a propagation point or part. As
already known, the wave front made by the secondary sound sources P and P necessarily causes
the time delay factor to deviate from the sound made by the main sound source P due to a time
delay factor, which factor Is a function of the time required for the high energy speech to reach
the end 14 and 15 from the converter 11. Although the strength of the fields P and P is
substantially lower than that of the main propagation form P, both of them cause delay distortion
in the audio signal, which is inevitable due to the generation of this distortion (C The degree
decreases. Because secondary sources P and P emit different frequencies of different efficiencies,
the balance of the propagation tone from points P and P is significantly different from that of the
main source, further reducing the accuracy and acoustic frequency balance of the sound wave It
becomes. In addition, secondary sources have unpredictable polar distribution patterns, which
are also frequency dependent. O Since more information is generated from a position offset from
the actual source, secondary or The presence of virtual propagation points P and P necessarily
reduces the imaging capability of the stereo or quadruple tone system. As a result, in an ideal
stereo system, the listener can determine the position of the instrument being used or its virtual
position from the whole of EndPage: 4 voice, and the image forming ability is still substantially
satisfactory. Although it gives a sense of reality, the secondary propagation part will make this
judgment go wrong. Clearly, the secondary or virtual sound source impairs the imaging
characteristics of the loudspeaker, ie the ability to accurately reproduce the proper spatial
arrangement of elements of the loudspeaker's audible signal. Yet another problem with installing
baffles in speakers is the resulting reduction in speaker dispersion and the occurrence of pole
bump patterns. The effects of distortion in composite speaker systems that use baffles, a means
conventionally used for transducer mounting, are woofer-2 mid-range and high-range
regenerators often on the same plane as their diaphragms, or in severe cases It is the fact that
the mid-range and high-range regenerators may be mounted on a plane closer to the listener
than the woofer's diaphragm. Since the rise time of a permanent magnet loudspeaker unit is
mainly a function of the mass and area of the diaphragm and voice coil assembly or the strength
of the magnetic field, the rise time of a woofer with a large and heavy diaphragm is high for the
same reason Usually, it is almost always larger than in the case of the high-range midrange
regenerators than the range or high frequency regenerators.
Buffling the woofer and the mid and treble bands on a common plane will result in additional
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deviations in the audio signal. That is, the transducer that can respond most quickly to the
electrical audio signal is the closest to the listener's ear. As a result, electrical signals of different
frequency bands simultaneously applied to different transducers and adapted to reach the given
moment in the listener's ear are received at different instants, which are different between the
transducer's natural rise times Not only are they separated by the fact that the treble can also be
mounted in front of the woofer's diaphragm and thus closer to the listener's ear. The 15reproduction of complex acoustical waveforms such as pulses, square waves, requires
superimposing low frequency and high frequency signal components at specific amplitudes for
specific time durations. Otherwise, in the absence of synchronization, the original signal and the
frequency spectrum are the same, but different waveforms occur. FIG. 2 shows a speaker
assembly 15 according to the present invention. The assembly 15 includes a woofer-encrosian
portion 16 of conventional design, and may be of the bass reflex type, infinity baffle, air
suspension, or preferably of the so-called transmission line type. The woofer-enclosure includes a
base plate or floor plate 17, side plates 18 and 19, a wall 20 ░ 21 inclined to the rear, a back
plate 22 and a top plate 23. The shape of the woofer-enclosure does not have to be exact. The
woofer means 24 is mounted to the woofer enclosure 15 in a standard manner. The loudspeaker
assembly includes a plurality of additional transducers 26 ░ 27.28.29, each one for
reproduction of the mid, mid-high, high and high ranges. As an addition, it is not necessary to use
a 4 ? ? converter and it will usually be appropriate to use two to cover the whole of the audible
spectrum. As before, a frequency divider circuit 30 is provided, which divides the input signal
into each band as usual and the output of the frequency divider circuit 30 is designed to
reproduce in these bands The appropriate converter is led to 24.26.27.28.29. The important
point of the improvement operation IC of this system is that the transducers 26 to 29 are
mounted in free space. "The term free space mounting j is taken to indicate that the transducers
26 to 29 are structurally supported by the support means with minimal space in the loudspeaker
assembly, in particular towards the listener. I want to be
Clearly, in order to place the transducers 26 to 29 in a predetermined position in the
loudspeaker assembly, some physical support means are required. Therefore, the term "r free
space installation" is EndPage: 5, which is an ideal but theoretical state. In the embodiment of
FIG. 2, the transducers 26 to 29 are supported on posts 26 ', 27', 28 'and 29' respectively, which
direct the minimal surface area in the listening axis direction. Optionally, but preferably, the side
surfaces of the columns 26 'and 29' and the outer surface of the top surface 23 of the wooferenclosure are squeezed with sound absorbing material to reduce reflections. In order to improve
the appearance, the loudspeaker assembly is provided with an acoustically transparent frame 31
of a length exceeding that extending along the side 18.19 of the woofer enclosure and the frame
is at the top A means 32 is included. An acoustically transparent but optically opaque grating
cloth 33 is stretched across the entire front surface of the assembly and beyond the woofer
enclosure to at least the back surface of the assembly. If within the frame and the outer part of
the woofer enclosure is preferably separated from the sound reflecting surface so that the frame
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element is formed of wood or other similar rigid material, the part of this frame element is a
sound absorbing material It is desirable to cover with. It is desirable that the interior assembly
portion of the woofer enclosure within the frame be substantially free of reflective surfaces. If
desired, an acoustically translucent blanket may be placed behind the transducer on the speaker
assembly to reduce some of the backward propagation from the speakers 26 to 29, thereby
allowing the viewing chamber If the loudspeaker assembly is arranged close to or in close
proximity to the wall, the backward propagation can be less than that of the forward one. As best
seen in FIGS. 3 and 4, the positions of the loudspeakers are offset from one another in the
direction of the listening axis. That is, the woofer 24 is located in front of the midrange speaker
26, while the speaker 26 is placed in front of the high midrange driver 27 and the driver 27 is on
the front of the treble 28 for two days. It is arranged in front of the super treble 29. The situation
outlined above 19-is merely to illustrate how each transducer is placed according to its rise time
characteristics. What is shown here is merely schematic, and the space X '(see FIG. 3) between
the main propagation surface of the mid-range converter 26 and one of the U ..- 24 is the rise of
the respective converter. It should be understood that it can be calculated from a function of time
characteristics.
For example, in this case, the woofer with a slow rise time is differentiated so that the signals
applied simultaneously to the terminals of the woofer 24 and the midrange converter 26
necessarily reach the listener's ear at the same time. Similarly, converter 27, which has a faster
rise time than converter 26, is displaced a distance 7 behind converter 26, and converter 28 is
displaced X aft relative to converter 27, converter 2B is offset relative to the transducers 28 by a
distance X so that each transducer is properly differentiated by its rise time characteristics. It will
be appreciated that the rise time characteristics of the transducers, and thus the context of the
locations within the assembly, may be determined 120-calculated or empirically by known
methods. However, a convenient empirical means of placing the transducers is to provide a
square wave across the frequency bands for the two transducers intended to cover the near
frequency bands and to look at the reproduced speech with an oscilloscope. The higher
frequency converter is adjusted forward or backward with respect to the top portion 23 until the
rectangular waveform picked up with microphones equidistant from the loudspeaker axis and
probed with the oscilloscope is as close as possible. Once the position of the transducer has been
determined, for example, once the position of the transducer 26 with respect to the woofer 24
has been established, the same method is repeated and the correct position of the transducer 27
is established using the square wave covered by the transducers 26 and 27. Do. The same
method is repeated to establish the correct position of the remaining transducers. -Although it is
desirable to inspect the converter units for each individual unit to obtain the best results, in the
actual production, the selected space should not be inspected with each individual unit ?. Make
sure that its rise time characteristics are sufficiently stable so that it can be reliably obtained on
EndPage: 6. In the square wave inspection stage, it is desirable to pass the square wave signal
through a frequency divider circuit. This is because the conventional circuit may exhibit some
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time shift and phase shift effects. The arrangement of the transducers in the enclosure in the
back and forth direction is mainly effective for listening on the listening axis and is particularly
close to one of the transducers when listening from a distance from the transducer axis. It should
be noted that rise time errors occur because of too much. However, since the above-mentioned
context arrangement is intended to improve on-axis listening, changes in rise time can not be
compensated by design changes. It is desirable to fix three or more decorative multi-legs to the
lower surface of the speaker assembly 15.
In the embodiments of FIGS. 5 and 6, like parts are indicated by like numerals, but here the
woofer 24 is placed in a rectangular enclosure as a whole, as disclosed in JP-A 50-110622 (7). It
can be seen that on its top surface 40 a tree-shaped transducer support means 41 is fixed. The
transducer support means 41 is provided with notches which constitute the respective
transducer receiving recess surfaces 42, 43. 44 of the mid-range, high-range and super-high
range transducers 26, 28 and 29 respectively. In this embodiment, it should be understood that
the anteroposterior arrangement of the transducers is provided in advance in making the present
means 41 based on the rise time characteristics of the transducers. As in the previously
described embodiment, an acoustically transparent frame or dome or cover is constructed on the
surface 45 how .. acoustically transparent with the front or side of the dome or frame. , Top and
preferably also at least slightly on the back. In addition, the rigid surface of the dome or frame,
such as the top surface 40 of the woofer enclosure and the end of the column support means 41,
is provided with a film of acoustically absorbent material. From the above, it is understood that
the present invention provides a composite transducer-speaker assembly that overcomes some of
the major deficiencies found in the previously known 23-dynamic-type loudspeaker assembly.
You see. The low frequency limit chosen for the converter with free space producing the lowest
frequency timbre may be chosen high enough to avoid cancellation effects. Under normal
conditions, the frequency produced by the converter with free space should not be less than
about 400-500 H2. When listening to a loudspeaker made in accordance with the present
invention, especially on-axis, the mids, highs and mids are characterized by unusual clarity and
sharpness, especially above normal, and high frequencies Because of the inherent beaming or
directivity of the electrostatic loudspeakers in the band C, even the best performing electrostatic
loudspeakers are inferior. The loudspeaker assembly does not show any coloration, which means
that the baffle constitutes part of the enclosure compared to a controlled loudspeaker assembly
consisting of 24 with the same transducer and frequency dividing circuit provided on the flim full
Whether or not it is immediately apparent. Many variations of the structural details will be
readily apparent to one skilled in the art from the foregoing disclosure.
4. Brief description of the drawings. FIG. 1 is a schematic view showing the sound propagation
form of a permanent magnet speaker having a dome-shaped conventional baffle, and FIG. 2 is a
view showing details of the structure in the speaker assembly according to the present invention.
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2 is a horizontal sectional view taken along the line 3-3 of FIG. 2, and FIG. 3 is a sectional view
taken along the line 4-4 of FIG. 5 is a partially broken perspective view showing another
embodiment of the present invention in order to show the details of its structure, and FIG. 6 is a
sectional view taken along line 6-6 in FIG. FIG. 5 is an enlarged detail of a longitudinal section; B и
и и и и и baffle plate W, W и и и и и и sidewall D и и и и и и diaphragm, the dome portion or the cone portion
L-L и и и и и и listening axis P, P, P ииииииииииии Propagation sound source x, x, x, x, x
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Wavy front 14.15
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
иииииииииииииииииииииииииии Floor plate 18. 19 ииииииииииииииииииииииииииииииииииииии Wall 22 и и и Back plate 23 и и и и и и и и и и и и и и и и и и
и и Uno first means 25 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и means Uno 25 means
.....? Transformers ? 26 ?, 27 ?, 28 ?, 29 ? ииииииииииииииииииииииииииииии Frequency division circuit 31
ииииииииииииииииииииииииииииии Means 3
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
Face applicant representative Atsushi Furuya (1 outside) EndPage: 8F / ? / F / G, 35, List of
attached documents (1) 1 description (2) 1 drawing (3) power of attorney Original text and
translated text 1 agent (4) Request duplicate 1 other agent other than the above EndPage: ?
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