JP2001025086

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DESCRIPTION JP2001025086
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
improvement of a technique for reproducing three-dimensional sound, and in particular, by
providing speakers on individual chairs, an excellent sound image localization effect can be
obtained anywhere. It is intended to be obtained.
[0002]
2. Description of the Related Art In recent years, in viewing films and television programs, in
video games and on stage sound effects, etc., three-dimensional sound is reproduced so that
sounds such as sound effects can be heard from an arbitrary direction viewed by the listener.
Techniques for sound reproduction are known. Although various techniques for such 3D sound
reproduction are specifically known, such as Dolby Surround (trademark), for example, a multichannel sound source is reproduced from a plurality of speakers provided around the listener. It
makes you feel the direction in which you hear the sound and the movement of the sound.
[0003]
[0003] Such three-dimensional sound reproduction technology is also applied to a wide area
intended for a large number of people such as various venues, movie theaters, halls, etc. It was to
hear the sound from the common speakers installed in the surroundings.
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[0004]
By the way, in the prior art as described above, in order to realize the direction in which the
sound is heard and the like by combining the strength of the sound heard from each speaker, the
common speaker When the sound is heard by a large number of people, the effect of sound
image localization is reduced depending on the position of the listener.
In particular, in a large place such as a hole, the position of the seat is largely different depending
on the person, so the effect of sound image localization may be insufficient depending on the
place such as the corner.
[0005]
The present invention has been proposed to solve the problems of the prior art as described
above, and its object is to provide an excellent sound image localization effect at any place by
providing speakers on individual chairs. It is an object of the present invention to provide a
three-dimensional sound reproduction technology, that is, a system and a hole for threedimensional sound reproduction, in which
[0006]
SUMMARY OF THE INVENTION In order to achieve the above object, according to a first aspect
of the present invention, there is provided a system for reproducing three-dimensional sound
comprising: a plurality of chairs provided with two left and right speakers facing the back; Sound
image localization operation means for adding sound localization to a recorded or synthesized
sound signal, and when the sound signal is output from the left and right speakers with respect
to the sound signal output from the sound image localization operation means And a threedimensional sound reproducing device for sending an acoustic signal processed by the
processing by the crosstalk cancellation calculation means for performing processing for
canceling the crosstalk of each of the generated channels to the respective speakers. Do.
According to the invention of claim 1, by arranging the chairs vertically and horizontally, a stereo
dipole system using a speaker provided on the back of the chair in front of each other at each
position as well as at the center of the hall enables three-dimensional sound localization. You can
enjoy the sound. It should be noted that for the front row of people, only the speakers may be
provided in front of the front row, and the backrests of the last row of chairs may have no
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speakers.
[0007]
According to a second aspect of the present invention, in the system for three-dimensional sound
reproduction according to the first aspect, the three-dimensional sound reproduction device is
for a sound signal between chairs adjacent to each other when output from the respective
speakers. A second crosstalk cancellation computing means for performing processing for
canceling the crosstalk that occurs, and an acoustic signal for which the processing for canceling
each of the crosstalk has been performed, for the left and right channels provided in each of the
chairs And means for outputting from the speaker.
[0008]
According to the invention of claim 2, although the sound of the speaker provided on the back of
the chair in front of the person reaches the ear of each person, the crosstalk from the speaker in
the chair next to the person in front is canceled. The localization of the sound image is clear.
[0009]
According to a third aspect of the present invention, the three-dimensional sound reproducing
hole is provided with a plurality of chairs arranged vertically and horizontally, the backrest being
provided with two left and right first speakers directed to the back, and at least in front of each
of the chairs. At least two left and right second speakers, sound image localization operation
means for applying sound localization to a recorded or synthesized sound signal, and the acoustic
signal output from the sound image localization operation means A crosstalk cancellation
calculation means for performing processing for canceling crosstalk of each channel generated
when signals are outputted from the left and right speakers, and an acoustic signal subjected to
the processing by at least the first speakers. And an apparatus for reproducing three-dimensional
sound.
According to the invention of claim 3, in each position of the hall, not only can enjoy threedimensional sound by excellent sound image localization by the stereo dipole system using the
first speaker provided on the back of the chair in front of the hall, etc. By using the second
speaker described above, it is possible to enjoy a powerful and immersive sound due to acoustic
characteristics different from the first speaker and echoes of the entire hall.
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[0010]
BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention
(hereinafter referred to as the present embodiment) will be specifically described with reference
to the drawings.
In the present embodiment, a portion related to processing of an acoustic signal can also be
realized by controlling a CPU such as a computer by software. In this case, the software is
created by combining the instructions according to the description of this specification, and the
method described in the prior art is also used in common with the above prior art. In each
drawing, the same reference numerals are given to the same members as the members shown in
the previous drawings, and the description will be omitted.
[0011]
【００１１】〔１． Constitution This embodiment exemplifies a system and a hole for threedimensional sound reproduction, and by providing speakers in individual chairs, an excellent
sound image localization effect can be obtained at any place.
[0012]
First, FIG. 1 is a conceptual view showing the overall structure of the hole H of the present
embodiment. That is, the hole H according to the present embodiment includes a stage or screen
S provided on the front (provisionally called a screen S), a plurality of chairs C provided so as to
face the screen S vertically and horizontally, and a three-dimensional sound. And a playback
device PA.
[0013]
Also, there are two types of speakers used in this hall, one of which is a first speaker (referred to
as a dedicated speaker) provided on the back of each chair C, two each on the left and right
toward the back. 2R and 2L, and the other type is two left and right second speakers (usually
called speakers) 7R and 7L provided on the front of each of the chairs C, that is, on both sides of
the screen S.
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[0014]
Here, FIG. 2 is a cross-sectional view of the chair C as viewed from the side, and the dedicated
speakers 2R and 2L are provided on the back of the backrest 1 of the chair C via the
soundproofing material 3 as shown in this figure. It is embedded rearward and covered with a
cover 4.
[0015]
A rear view of this state as seen from the rear of the chair C is shown in FIG.
However, the cover 4 is omitted.
That is, when viewed from a person sitting behind the chair C, the left and right dedicated
speakers 2R and 2L are lined toward oneself on the back of the chair C in front. In order to
reduce the influence of acoustic interference between the adjacent chairs C, the distance from the
outer edge of each of the left and right dedicated speakers 2R and 2L to the outer edge of the
arm rest is at least 30 cm, as viewed from the center line of the chair C. It is desirable to do.
[0016]
Further, the three-dimensional sound reproducing apparatus PA shown in FIG. 1 is an apparatus
for sending an acoustic signal to the dedicated speakers 2R and 2L provided in each chair as
described above and the normal speakers 7R and 7L in front. At least each of the dedicated
speakers 2R and 2L is configured to send an acoustic signal processed by a stereo dipole.
[0017]
Here, the stereo dipole system is one of the techniques of sound image localization.
First, with sound image localization technology, depending on the position and direction of the
sound source, the transmission system such as a room or space, reflection from the head, ears,
shoulders, etc. of the listener, reflection, diffraction, resonance, etc. It is a technology that applies
the fact that the frequency components that reach the ear, that is, the timbre, etc. are different.
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[0018]
Specifically, the technique of sound image localization applies processing based on a head-related
transfer function that causes differences such as differences in intensity, frequency components,
and phase shifts of sound waves to sounds heard in the left and right ears. It makes you feel as if
it comes from a particular direction.
[0019]
As an example of such a technique for sound image localization, binaural recording is known in
addition to stereo dipoles.
For example, binaural recording is a technology that reproduces the sound field by controlling
the sound pressure transmitted to both ears of the listener, and the microphone placed at the
position of both ears of the dummy head resembling human head reaches both ears It is a
technology to record and reproduce the sound as it is. Although this binaural recording is
excellent in the localization and realism of the original sound field, the reproduction is
substantially limited to the headphones, and there are problems such as the influence of the
characteristics of the headphones and the discomfort when worn.
[0020]
On the other hand, the stereo dipole system used in the present embodiment is a technology for
reproducing a three-dimensional sound with two speakers arranged in close proximity, and the
sound from the left and right speakers is opposite by a digital filter matched to the type of sound
source. Arbitrary phenomena in the space by canceling the phenomenon (called crosstalk) that
can reach the side ear, and electrically synthesizing the above-mentioned head related transfer
functions according to the desired angle and distance in the three-dimensional space The virtual
sound source is placed at the position of. Further, processing on such an acoustic signal is called
processing by a stereo dipole.
[0021]
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According to such a stereo dipole system, the installation space of the speakers can be made
compact as compared with the transaural system in which the left and right speakers are
installed at positions separated from each other, and the listener can experience the 3D effect.
The range that can be done is wide, and localization of the sound image is stable. Further, in the
stereo dipole system, sound sources by conventional stereo recording and binaural recording can
be reproduced in three dimensions without using a rear speaker or the like.
[0022]
That is, the three-dimensional sound reproducing apparatus PA is configured to send an acoustic
signal processed by the above-mentioned stereo dipole to at least each of the dedicated speakers
2R and 2L, specifically, As shown in FIG. 4, an original sound generation unit 11, an acoustic
localization calculation unit 12, a crosstalk cancellation calculation unit 13, a second crosstalk
cancellation calculation unit 14, and an output control unit 15 are provided.
[0023]
Among them, the original sound generation means 11 is for reproducing an acoustic signal
recorded in advance in a medium such as a sound track of a projection film or synthesizing it by
a computer or the like to generate an acoustic signal to be an original sound. It is a part, and for
example, a control circuit for reading out a signal or the like from the recording medium, an
amplification circuit for amplifying the level of the read out signal, an A / D conversion circuit or
the like may be combined as appropriate.
Here, it is assumed that the stereo sound signal thus generated as the original sound is output to
the normal speakers 7R and 7L through a means such as an amplifier.
[0024]
The sound localization operation means 12 is a part for adding the localization of sound to the
sound signal provided from the original sound generation means 11. Further, the crosstalk
cancellation calculation means 13 cancels the crosstalk of each channel generated when the
sound signal is outputted from the left and right speakers with respect to the sound signal
outputted from the sound image localization calculation means 12 Part of the
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[0025]
Further, the second crosstalk cancellation computing means 14 is a process for canceling the
crosstalk occurring between the adjacent chairs when the sound signal is outputted from the
dedicated speakers 2R and 2L. Part of the
[0026]
Further, the output control unit 15 outputs the acoustic signal processed by the crosstalk
cancellation calculation means 13 and the second crosstalk cancellation calculation means 14 to
the dedicated speakers 2 R of the left and right channels provided in each chair. , 2L and includes
means such as a D / A conversion circuit or an amplifier.
[0027]
As shown in FIG. 1, it is desirable to provide only one dedicated speaker 2R, 2L in front of the
chairs C in the front row.
Moreover, since the dedicated speakers 2R and 2L are not essential for the last row of chairs, it is
possible to use the chair CX without the dedicated speakers 2R and 2L.
[0028]
【００２８】〔２．
Operation] The present embodiment configured as described above operates as follows. 〔
２−１． Outline of operation] In the present embodiment (FIG. 1), acoustic signals
corresponding to the image on the stage or screen S, etc. are generated by the three-dimensional
sound reproducing apparatus PA with dedicated speakers 2R and 2L provided on each chair C.
The sound signal which has been processed by the stereo dipole is sent to the dedicated speakers
7R and 7L in front, and in particular to the dedicated speakers 2R and 2L.
[0029]
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【００２９】〔２−２． Concrete action] More specifically, in the three-dimensional sound
reproducing apparatus PA (FIG. 4), first, the original sound generating means 11 reproduces an
acoustic signal previously recorded on a medium such as a sound track of a projection film, or An
acoustic signal to be an original sound is generated by synthesizing by a computer or the like. As
described above, the sound signal of the original sound provided from the original sound
generation unit 11 is branched into two systems, one of which is output to the normal speakers
7R and 7L as normal stereo sound.
[0030]
For the other acoustic signal, the following processing is performed by the digital filter matched
to the type of the sound source. That is, for this acoustic signal, first, by means of the acoustic
localization operation means 12, the head transfer function according to the desired angle and
distance in the three-dimensional space is electrically synthesized to be virtual at an arbitrary
position in the space. Processing is performed to arrange the sound source, that is, to add sound
localization.
[0031]
Subsequently, with respect to this acoustic signal, the crosstalk cancellation operation means 13
performs processing for canceling the crosstalk between the respective channels which occurs
when the acoustic signal is outputted from the left and right speakers. Further, following such
processing, for the acoustic signal, the second crosstalk cancellation computing means 14
cancels the crosstalk occurring between the chairs adjacent to each other when output from the
dedicated speakers 2R and 2L. Apply processing for
[0032]
Then, the output control unit 15 transmits the acoustic signals processed as described above by
the sound localization calculation means 12, the crosstalk cancellation calculation means 13 and
the second crosstalk cancellation calculation means 14 to each chair C. It outputs from the
dedicated speakers 2R and 2L of the left and right channels provided in.
[0033]
As a result, at each position of the hall, the sound processed by the stereo dipole system can be
heard from the dedicated speakers 2R and 2L provided on the back of the chair in front, so the
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three-dimensional sound by the excellent sound image localization can be obtained. It can be
enjoyed.
[0034]
That is, in the technique of sound image localization using a speaker, it is assumed that there is a
person to be heard at a specific position (referred to as a control point) seen from the speaker,
and the best sound image localization near such control points is The output signal of each
speaker is processed to obtain an effect.
For this reason, even if the stereo dipole system is applied, if all audience members listen to only
the sound of the large speaker as in the conventional case, the person at the end deviated from
the control point installed near the center of the hall As a result, the effect of the sound image
localization is reduced due to the influence of the crosstalk component and the like.
[0035]
On the other hand, in the present embodiment, even if a person sitting in any chair in the hall H
is an acoustic control point output based on the stereo dipole system from the dedicated
speakers 2R and 2L provided in front of him Since the user is in the room, it is possible to enjoy
the three-dimensional sound by the excellent sound image localization.
[0036]
【００３６】〔３．
Effect] As described above, in the present embodiment, by providing the dedicated speakers 2R
and 2L to the individual chairs C, the chair in front of the chair is heard no matter which chair C
or CX in the hall H hears the person who listens to the sound. The stereo dipole system using
dedicated speakers 2R and 2L provided on the back of the user can enjoy three-dimensional
sound by excellent sound image localization.
[0037]
Also, in the present embodiment, the sound of the dedicated speakers 2R and 2L provided on the
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back of the chair in front of each other reaches the ears of each person, but the action of the
second crosstalk cancellation computing means 14 Since the crosstalk from the dedicated
speakers 2R and 2L of the chair next to the current chair is canceled, the localization of the
sound image becomes clear.
[0038]
Also, in this embodiment, in each position of the hall, not only can you enjoy three-dimensional
sound by excellent sound image localization with the stereo dipole system using dedicated
speakers 2R and 2L provided on the back of the chair in front of the hall. By using the normal
speakers 7R and 7L provided at the front etc., it is possible to enjoy a powerful and immersive
sound due to acoustic characteristics different from the dedicated speakers 2R and 2L and the
reflection of the entire hole H.
[0039]
【００３９】〔４．
Other Embodiments] The present invention is not limited to the above-described embodiments,
but includes other embodiments as exemplified below.
For example, a hall means a facility configured to allow multiple people to hear sounds
regardless of name, and a roof or wall of a specific structure is not essential.
[0040]
Further, as for the dedicated speaker, it is not essential to embed it on the backrest as shown in
FIG. 2, for example, a thin speaker may be attached to the backrest surface.
Furthermore, the specific configuration of the three-dimensional sound reproducing apparatus is
free, and it is not essential to provide only one in the hole H, and it may be provided in a separate
room such as a sound control room, or plural for each type of original sound. You may provide.
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[0041]
Further, the specific algorithm of the calculation for sound image localization and crosstalk
cancellation and various characteristic values can be freely determined. Further, it is also free to
provide dedicated speakers 2R and 2L for all the chairs. Further, the acoustic signal processed by
the stereo dipole can be output not only to the dedicated speakers 2R and 2L but also to the
normal speakers 7R and 7L.
[0042]
As described above, according to the present invention, by providing speakers in individual
chairs, a technique of three-dimensional sound reproduction in which an excellent sound image
localization effect can be obtained anywhere, that is, three-dimensional sound Systems and holes
for regeneration can be provided.
[0043]
Brief description of the drawings
[0044]
1 is a conceptual diagram showing the configuration of the hole in the embodiment of the
present invention.
[0045]
2 is a side sectional view of a chair according to an embodiment of the present invention.
[0046]
3 is a back view of the chair in the embodiment of the present invention.
[0047]
4 is a functional block diagram showing the configuration of a three-dimensional sound
reproduction apparatus according to an embodiment of the present invention.
[0048]
Explanation of sign
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[0049]
DESCRIPTION OF SYMBOLS 1 ... Backrest 2 (R, L) ... Dedicated speaker 3 ... Soundproofing
material 4 ... Cover 5 (R, L) ... Armrest 7 (R, L) ... Normal speaker 11 ... Original sound generation
means 12 ... Sound localization operation means 13 ... Cross Talk cancellation arithmetic means
14 Second crosstalk cancellation arithmetic means 15 Output control means H Hall C, CX Chair
PA Solid sound reproduction device S Stage or screen
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