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JP2012070135

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DESCRIPTION JP2012070135
The present invention makes it possible to form a wide sweet spot when reproducing a binaurally
recorded sound signal using a stationary speaker. SOLUTION: Two planes arranged
symmetrically with respect to the predetermined position are subjected to crosstalk cancellation
so that a binaural effect can be correctly obtained at predetermined positions on sound signals of
left and right channels recorded in binaural. Each of the speakers subjected to the crosstalk
cancellation is given to each of the speakers, and parallel sound waves intersecting at the
predetermined position are emitted. [Selected figure] Figure 2
Method and apparatus for reproducing binaural recorded sound signal
[0001]
The present invention relates to a technique for reproducing binaurally recorded sound signals
using stationary speakers.
[0002]
Binaural recording is a technology in which microphones are attached to both ears of a dummy
head imitating a human head, and the sound of the recording target is collected and recorded by
these microphones.
In binaural recording, a sound signal representing a sound heard by a person with the right ear
and a sound signal representing a sound heard by the left ear are separately recorded. When
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1
reproducing a binaurally recorded sound signal as sound, it is possible to use headphones or to
use a stationary speaker. When a binaural recorded sound signal is reproduced using a stationary
speaker, crosstalk occurs in which sound radiated toward each of the left and right ears is also
transmitted to the other ear. Therefore, when the binaural recorded sound signal is reproduced
using the stationary speaker, the binaural effect (allowing the same sound to be heard when the
listener is at the position of the dummy head) is correctly obtained. It is necessary to perform socalled crosstalk cancellation (see, for example, Non-Patent Document 1).
[0003]
JP, 2009-16945, A JP, 2007-28066, A
[0004]
Akihiro Yonemoto, Yasuhiro Sakurai, Yasuhide Iwata, Yuji Ito, "Speech rate conversion and range
expansion, virtual surround, automatic sound field correction, etc. (second part)-Trends and
realization methods of speech signal processing by DSP", [Heisei August 12, 22 Search], Internet
<http://www.kumikomi.net/archives/2009/09/dsp_1.php?
page = 2>
[0005]
However, conventionally, when a binaurally recorded sound signal is reproduced as sound using
a stationary speaker, there has been a problem that an area (hereinafter, sweet spot) in which
crosstalk cancellation is effective is very narrow. The present invention has been made in view of
the above problems, and provides a technology that makes it possible to form a wide sweet spot
when reproducing a binaurally recorded sound signal using a stationary speaker. To aim.
[0006]
In order to solve the above problems, the present invention applies crosstalk cancellation
processing to the speakers of each channel so that the binaural effect can be correctly obtained
at predetermined positions on the sound signals of the left and right channels binaurally
recorded. There is provided a method of reproducing a binaurally recorded sound signal, wherein
parallel sound waves corresponding to the sound signals subjected to the crosstalk cancellation
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processing are emitted to cross at the predetermined position.
[0007]
As specific examples of the sound emitting means for emitting the sounds of the left and right
channels as parallel sound waves intersecting at the predetermined position, various ones can be
considered.
For example, as the speaker, a flat speaker arranged symmetrically (in such a way that the
propagation paths of sound reaching the predetermined position are equal) viewed from the
predetermined position is used. It is conceivable to use as a sound means. In such an
embodiment, crosstalk is heard on the symmetry axis of the isosceles triangle (the bisector of the
angle over which each flat speaker is viewed from the above predetermined position) whose
apexes are each flat speaker and the above predetermined position. Instead, the sweet spot
expands by an amount corresponding to the width of the flat speaker (that is, the width of the
parallel sound wave) along the symmetry axis. As prior art for reproducing sound using a flat
speaker, there are Patent Document 1 and Patent Document 2, but these are wide sweet spots
when reproducing a binaurally recorded sound signal using a stationary speaker There is no idea
that the parallel sound waves emitted from the two flat speakers cross each other. That is, the
inventions disclosed in Patent Document 1 and Patent Document 2 are different from the present
invention. In addition, a cone speaker is used as a speaker for outputting the sound of each of the
left and right channels, and a spherical wave sound wave emitted from the cone speaker is
reflected by an acoustic reflection plate having a parabolic reflection surface to emit a parallel
sound wave to a listener. Aspect (that is, a mode in which a combination of a cone speaker and an
acoustic reflector having a parabolic reflection surface is used as the above sound emitting
means) or a spherical wave sound wave emitted from the cone speaker is converted into parallel
sound waves through an acoustic convex lens A mode of radiating to a listener (that is, a mode of
using a combination of a cone speaker and an acoustic convex lens as the sound emitting means),
a mode of using a horn speaker as the sound emitting means, and the like are also conceivable.
[0008]
Further, each of the plurality of parallel sound waves corresponding to the left channel sound
signal subjected to the crosstalk cancellation processing is emitted in parallel with each other,
and the sound signal corresponding to the right channel subjected to the crosstalk cancellation
processing is generated. Each of the plurality of parallel sound waves may be emitted parallel to
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each other. Although details will be described later, according to such an aspect, it is possible to
further broaden the sweet spot when reproducing the binaurally recorded sound signal using a
stationary speaker. Here, as a specific mode of realizing emission of each of the plurality of
parallel sound waves according to the left channel sound signal subjected to the crosstalk
cancellation processing in parallel with each other, each of the plurality of planar speakers is And
it is possible to consider a mode in which the left channel sound signal subjected to the crosstalk
cancellation processing is provided to each of the plurality of planar speakers so as not to
overlap each other (the same applies to the right channel). In addition, a mode may also be
considered in which a vibrating body in which slits having a plurality of angled slits or a plurality
of strip-like vibrating plates are arranged in a sawtooth shape on a sound emitting surface of a
flat speaker is mounted. Furthermore, it is also possible to provide an acoustic prism or a
reflection plate in the propagation path of the parallel sound wave, adjust the traveling direction
of the parallel sound wave by refraction by the acoustic prism or reflection by the reflection
plate, and broaden the sweet spot.
[0009]
Further, in order to solve the above problems, according to the present invention, crosstalk
cancellation processing is performed on each of the binaurally recorded sound signals of the left
and right channels so that a binaural effect can be correctly obtained at a predetermined
position. And a first speaker emitting a sound according to the left channel sound signal
subjected to the crosstalk cancellation processing, and emitting the sound as a parallel sound
toward the predetermined position A second speaker including a sound means and a second
speaker for emitting a sound according to the right channel sound signal subjected to the
crosstalk cancellation processing, and emitting the sound as a parallel sound toward the
predetermined position; There is provided a reproduction apparatus for reproducing a binaurally
recorded sound signal as a sound, comprising: sound emission means.
[0010]
It is a figure which shows an example of the audio system containing the reproducing |
regenerating apparatus 1 of 1st Embodiment of this invention.
It is a figure for demonstrating the example of arrangement | positioning of the speaker in the
said 1st Embodiment. It is a figure for describing 2nd Embodiment of this invention. It is a figure
for describing 3rd Embodiment of this invention. It is a figure for demonstrating the other aspect
of the said 3rd Embodiment. It is a figure for describing 4th Embodiment of this invention. It is a
figure for demonstrating the other aspect of the said 4th Embodiment.
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[0011]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. (A: First Embodiment) FIG. 1 is a view showing an example of the configuration of an
audio system including a playback device 1 according to a first embodiment of the present
invention. The reproduction apparatus 1 of FIG. 1 is an apparatus for reproducing the sound
signals XL and XR of left and right one channels obtained by binaural recording as sounds using
stationary speakers SP-L and SP-R, respectively. In the audio system shown in FIG. 1, binaural
recording is performed using a dummy head 10 which imitates a human head. In the audio
system shown in FIG. 1, binaural recording is realized by writing the sound signal XL output from
the microphone ML and the sound signal XR output from the microphone MR to a recording
medium such as a CD (Compact Disk) by the recording device 20. Ru. The sound signals XL and
XR binaurally recorded in this manner can be reproduced as sound by headphones equipped
with the speakers HSP-L and HSP-R, in addition to being reproduced as sound by the
reproduction device 1.
[0012]
As shown in FIG. 1, the reproduction device 1 includes a crosstalk cancellation unit 30 and an
amplifier 40 in addition to the speaker SP-L and the speaker SP-R. The crosstalk cancellation unit
30 is, for example, a DSP (Digital Signal Processor), performs crosstalk cancellation processing on
each of the sound signals XL and XR, and generates and outputs sound signals YL and YR. The
contents of this crosstalk cancellation process are, for example, as follows.
[0013]
In FIG. 1, the transfer function of the propagation path of the sound from the speaker SP-L to the
listener's left ear EL is hFL, the transfer function of the propagation path to the right ear is hCL,
and the speaker SP-R to the listener's right ear ER The transfer function of the sound propagation
path is hFR, and the transfer function of the propagation path to the left ear is hCR. In this case, if
sound signal YL is given to speaker SP-L to emit sound and sound signal YR is given to speaker
SP-R to emit sound, sound ZL to the listener's left ear and the right ear The audible sound ZR is
represented by the following equation 1: In order for crosstalk not to occur at the position of the
listener and to obtain a binaural effect correctly, ZL = XL and ZR = XR. Therefore, the crosstalk
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cancellation unit 30 realizes crosstalk cancellation by calculating the sound signals YL and YR
from the sound signals XL and XR by performing the calculation shown in the following Equation
2. In Equation 2, the matrix M <−1> is the inverse of the matrix M of Equation 1.
[0014]
The amplifier 40 of FIG. 1 amplifies each of the sound signals YL and YR output from the
crosstalk cancellation unit 30 to a signal level suitable for driving a speaker, and supplies the
amplified signal to each of the speaker SP-L and the speaker SP-R. The speaker SP-L emits a
sound corresponding to the sound signal YL, and the speaker SP-L emits a sound corresponding
to the sound signal YR. These sounds propagate to the left and right ears of the listener along the
four propagation paths shown in FIG. 1 (the transfer paths of the hFL, hCL, hFR and hCR
propagation paths). As a result, a sound corresponding to the sound signal XL can be heard on
the left ear EL of the listener, and a sound corresponding to the sound signal XR can be heard on
the right ear ER.
[0015]
As apparent from FIG. 1, the electrical configuration of the playback apparatus 1 is different from
the electrical configuration of a general playback apparatus that plays back binaural recorded
sound signals using stationary speakers. There is no. The first feature of this embodiment is that
a flat speaker is used as the speaker SP-L and the speaker SP-R. These flat speakers are parallel
sound waves having a wave front having a width corresponding to the width of the sound
emission surface (a sound wave in which the same time wave front of the sound forms a plane
perpendicular to the propagation direction) Emit as. The second feature of the present
embodiment is that each of the parallel sound waves intersects at a predetermined position
(hereinafter referred to as “sweet spot center”) assumed to be a position at which the binaural
effect is correctly obtained. The arrangement of the flat speakers (that is, the arrangement of the
flat speakers).
[0016]
The speaker SP-L and the speaker SP-R of the present embodiment are arranged symmetrically
with respect to the center of the sweet spot. For example, in the example shown in FIG. 2A and
FIG. 2B, the position of the listener B is assumed as the center of the sweet spot SS. FIG. 2A
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exemplifies a mode in which the speakers SP-L and SP-R are arranged symmetrically with respect
to the same listener B in the front direction of the listener B on the horizontal surface (XY plane).
Similarly, in the example shown in FIG. 2B, the speakers SP-L and SP-R are disposed above the
listener B symmetrically with respect to the listener B. In any of the mode shown in FIG. 2 (A) and
the mode shown in FIG. 2 (B), the length of the propagation path LB of the sound from the
speaker SP-L to the left ear of the listener B and the same listener from the speaker SP-R The
length of the propagation path RB of the sound reaching the right ear of B is equal. Since the
crosstalk cancellation processing 30 is applied to the sound signals YL and YR so that the
binaural effect can be correctly obtained at the position of the listener B, crosstalk is heard at the
position of the listener B. The binaural effect is correctly obtained.
[0017]
In the embodiment shown in FIG. 2 (A), the symmetry axes (position of listener B, planar speakers
SP-L and SP-R in the arrangement of speakers SP-L and SP-R symmetrically arranged in front of
listener B) The listener A and the listener C who line up the listener B in a row along the
symmetry axis of the isosceles triangle (each of which is at the top) can hear the parallel sound
waves emitted from each of the flat speakers SP-L and SP-R. The crosstalk is not heard even at
the positions of the listener A and the listener C, and the binaural effect is correctly played. The
reason is that the parallel sound waves radiated from each of the loudspeaker SP-L and the
loudspeaker SP-R have very small attenuation according to the length of the propagation path,
and the transfer functions hFL, hCL, hFR and the position on the symmetry axis This is because
each hCR is constant. As described above, in the embodiment shown in FIG. 2A, the sweet spot SS
is expanded by an amount corresponding to the width W of the flat speaker (that is, the width of
the wavefront of parallel sound waves) in the front and back direction along the symmetry axis. It
is possible. Similarly, also in the embodiment shown in FIG. 2 (B), the listeners A and C are
vertically aligned along the symmetry axis in the arrangement of the speakers SP-L and SP-R
arranged symmetrically above the listener B. No crosstalk is heard at the position, and the
binaural effect is correctly obtained. That is, according to the aspect shown in FIG. 2 (B), the
sweet spot SS can be expanded by an amount corresponding to the width W of the flat speaker in
the vertical direction along the axis of symmetry.
[0018]
As described above, according to the present embodiment, when reproducing a binaurally
recorded sound signal using a stationary speaker, a flat speaker is used as a speaker that emits
the sound of each of the left and right channels. By arranging the flat speakers symmetrically
with respect to the position assumed as the center and emitting the sound of each channel as a
parallel sound wave crossing at the center of the sweet spot, the centers of the flat speakers and
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the sweet spot are made apexes. Thus, the sweet spot can be expanded in the direction of the
symmetry axis of the isosceles triangle corresponding to the width of each flat speaker.
[0019]
(B: Second Embodiment) In the first embodiment described above, according to each of the sound
signals YL and YR obtained by performing crosstalk cancellation processing on each of the sound
signals XL and XR of the left and right channels recorded in binaural. A flat speaker was used as
a sound emitting means for emitting the parallel sound as a parallel sound.
However, a horn speaker may be used as the sound emitting means, and a combination of a cone
speaker and an acoustic reflector may be used as the sound emitting means. In addition, a horn
speaker is a speaker comprised by attaching the pipe | tube which spreads in conical shape
called a horn to a cone speaker.
[0020]
FIG. 3 is a view for explaining a second embodiment of the present invention. In the example
shown in FIG. 3, as a sound emitting means for emitting the sound of the left channel as a
parallel sound wave, the flat speaker SP-L in FIG. 1 (drawn by a dotted line in FIG. 3) is replaced
with a cone speaker CSP-L A combination with an acoustic reflector plate REF having a reflective
surface is used. Further, in the example shown in FIG. 3, as a sound emitting means for emitting
the sound of the right channel as a parallel sound wave, the horn speaker P is replaced by the
cone speaker CSP-R instead of the flat speaker SP-R (drawn by the same dotted line) in FIG. A
combined horn speaker PSP-R is used. Alternatively, the acoustic wave emitted from the cone
speaker may be converged by an acoustic convex lens to generate a parallel acoustic wave. Also
in the embodiment shown in FIG. 3, the length of the propagation path of the sound from the
horn speaker PSP-R to the position assumed as the center of the sweet spot SS, and the reflection
from the cone speaker CSP-L by the acoustic reflector REF to the sweet It goes without saying
that it is necessary to equalize the length of the sound propagation path to the position assumed
as the center of the spot SS. If the lengths of the propagation paths are not equal, the crosstalk is
not canceled even at the center of the sweet spot SS, and the binaural effect can not be obtained
correctly. Thus, also according to this embodiment, it is possible to form a large sweet spot when
reproducing a binaurally recorded sound signal using a stationary speaker.
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[0021]
(C: Third Embodiment) In the first embodiment described above, the flat speakers SP-L and SP-R
are arranged symmetrically with respect to the position assumed as the center of the sweet spot,
and the sound of each of the left and right channels is said position The sweet spot was spread in
the direction of the symmetry axis of an isosceles triangle whose apexes are the flat speakers and
the center of the sweet spot by emitting parallel acoustic waves intersecting at. However, by
adjusting the arrival direction of each parallel sound wave with respect to the position assumed
as the center of the sweet spot, the sweet spot is expanded in the direction orthogonal to the
symmetry axis (more precisely, the bottom direction of the isosceles triangle). It is also possible.
[0022]
FIG. 4 is a diagram showing a specific example of an aspect in which the directions of arrival of
the respective parallel sound waves with respect to the position assumed as the center of the
sweet spot are adjusted using the planar acoustic reflectors REF-L and REF-R. As shown in FIG. 4,
the flat speakers SP-L and SP-R and the acoustic reflectors REF-L and REF-R are from the flat
speaker SP-L to the center CC of the sweet spot SS through the acoustic reflector REF-L. They are
arranged symmetrically so that the length of the propagation path to reach and the length of the
propagation path from the planar speaker SP-R to the center CC of the sweet spot via the
acoustic reflector REF-R are equal. Therefore, it goes without saying that the binaural effect can
be correctly obtained at the positions on the symmetry axis (the positions of the listener A and
the listener C2).
[0023]
Here, in FIG. 4, the sound propagation path (that is, path L1 + L2) from the flat speaker SP-L to
the position of the listener C1 through the acoustic reflection plate REF-L and the sound
reflection plate REF-R from the flat speaker SP-R Consider the sound propagation path (i.e., path
R1 + R2) through which the position of the listener C1 is reached. This is because if the lengths
of these two propagation paths are equal, the binaural effect is correctly played even at the
position of the listener C1. As apparent from FIG. 4, from the geometrical symmetry, the length of
the path R2 is equal to the length obtained by subtracting the path ΔL from the path L2 (R2 =
L2-ΔL), and the length of the path L1 The length is equal to the length obtained by subtracting
the path ΔR from the path R1 (L1 = R1−ΔR). Therefore, the propagation path of the sound
from the flat speaker SP-L to the position of the listener C1 through the acoustic reflection plate
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REF-L and the sound from the flat speaker SP-R to the position of the same listener C1 through
the acoustic reflection plate REF-R The path difference D of the propagation path is: D = (L1 +
L2)-(R1 + R2) = (L1 + L2)-(L2-ΔL + R1) = (L1-R1) + ΔL = ΔL-ΔR. This can be achieved by
adjusting the relative positional relationship between the flat speakers SP-L and SP-R and the
acoustic reflectors REF-L and REF-R so that ΔL = ΔR in FIG. Also means that the binaural effect
is obtained correctly. The same is true for the positions of listener B1, listener B2 and listener C3.
[0024]
Thus, the flat speakers SP-L and SP-R are arranged symmetrically with respect to the position
assumed to be the center of the sweet spot SS, and the propagation of sound from the flat
speaker SP-L (SP-R) to the position By providing an acoustic reflector in the middle of the path
and adjusting the arrival direction of the parallel sound wave with respect to the position
assumed as the center of the sweet spot SS, the sweet spot SS is spread not only in the symmetry
axis direction but in the direction orthogonal to this. It is possible to In FIG. 4, the direction of
arrival of the parallel sound wave is adjusted by reflection by the acoustic reflection plate, but as
shown in FIG. 5, the direction of arrival is adjusted by refracting the parallel sound wave using
the acoustic prisms APL and APR. Of course it is good. Here, the acoustic prism is a hollow
polygonal prism (triangular prism or the like) formed of, for example, a resin or the like in which
a gas such as helium having a propagation speed of sound waves different from that of the
atmosphere is sealed.
[0025]
(D: Fourth Embodiment) In the third embodiment described above, the flat speakers SP-L and SPR are arranged symmetrically with respect to the position assumed as the center of the sweet
spot, and the flat speakers SP-L (SP The sweet spot is adjusted in the direction of the symmetry
axis and in the direction orthogonal to this by adjusting the direction of arrival of the parallel
sound wave by the acoustic reflector (or acoustic prism) provided in the middle of the sound
propagation path from -R) to the position. It was realized to expand. However, as shown in FIG. 6,
the flat speakers SP-L1, SP-L2 and SP-L3 should be parallel and do not overlap each other as
sound emitting means for emitting parallel sound waves according to the sound signal YL of the
left channel. Each of the flat speakers SP-R1, SP-R2 and SP-R3 is disposed as a sound emitting
means for arranging and emitting parallel sound waves according to the right channel sound
signal YR as the flat speakers SP-L1, SP-L2 and SP-. By arranging them symmetrically with each
of L3, it is also possible to spread the sweet spot in the direction of the axis of symmetry and in
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the direction orthogonal thereto.
[0026]
For example, in the example shown in FIG. 6, at the positions of the listener A and the listener C2,
the binaural effect is achieved by listening to the parallel sound wave emitted from the flat
speaker SP-L1 and the parallel sound wave emitted from the flat speaker SP-R1. Get it right.
Further, in the example shown in FIG. 6, the flat speakers SP-L2 and SP-R1 are arranged
symmetrically with respect to the listener B1. Therefore, at the position of the listener B1, the
binaural effect can be correctly obtained by listening to the parallel sound wave emitted from the
flat speaker SP-L2 and the parallel sound wave emitted from the flat speaker SP-R1. Similarly, the
parallel sound radiated from the flat speaker SP-L3 and the flat speaker SP-R1 at the position of
the listener C1 and the parallel sound radiated from the flat speaker SP-L1 and the flat speaker
SP-R2 at the position of the listener B2 The binaural effect is correctly obtained by the parallel
sound waves emitted from the flat speaker SP-L1 and the flat speaker SP-R3 at the position of the
listener C3 by the sound wave. In the example shown in FIG. 6, the speaker SP-L3 (SP-R3) is
translated to the position SP-L3 'indicated by a dotted line in parallel, and the audio signal YL
(YR) is supplied to the speaker SP-L3 (SP-R3). It is also possible to make the speaker arrangement
compact by appropriately adjusting the delay. As shown in FIG. 7, it is considered that the same
effect can be obtained even if a vibrating body in which a plurality of strip-shaped vibrating
plates are arranged in a sawtooth shape is mounted on the sound emitting surface of the flat
speaker. In the embodiment shown in FIG. 7, it is considered that each of the plurality of stripshaped diaphragms arranged in a sawtooth shape plays a role of a flat speaker.
[0027]
(E: Other Embodiments) Although the first to fourth embodiments of the present invention have
been described above, modifications described below may of course be added to these
embodiments. (1) In the first to fourth embodiments described above, the crosstalk cancellation
unit 30 applies crosstalk cancellation to the sound signals of the left and right channels so that
the binaural effect can be correctly obtained at the position desired to be assumed as the center
of the sweet spot. However, signal processing for correcting the output characteristic of the
speaker may be performed together with the crosstalk cancellation. If the output characteristic of
the speaker is distorted (not flat), the crosstalk may not be canceled correctly, and the binaural
effect may not be correctly obtained even at the center of the sweet spot.
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[0028]
(2) In the first embodiment described above, the flat speakers SP-L and SP-R are symmetrical
with respect to the position assumed as the center of the sweet spot (the center position of the
sweet spot and the arrangement position of each flat speaker are It arranges so that it may
become a vertex of an isosceles triangle. However, the flat speaker SP-L (or flat speaker SP-R) is
moved in parallel so as to approach the center of the sweet spot (or away from the stop), and the
delay corresponding to the amount of movement is Alternatively, it may be given to the sound
signal YR) and given to the flat speaker SP-L (or flat speaker SP-R). Also in such a mode, it is
possible to spread the sweet spot by an amount corresponding to the width of the flat speakers
along a bisector of the angle that overlooks the flat speakers from the position assumed as the
center of the sweet spot. As described above, according to this aspect, a suite for reproducing a
binaurally recorded sound signal using the stationary speaker while increasing the freedom of
the arrangement position of the flat speakers SP-L and SP-R. It is possible to spread the spot
more than before.
[0029]
(3) In the first embodiment described above, the width of the flat speaker emitting the parallel
sound in the left channel and the width of the flat speaker emitting the parallel sound in the right
channel are equal to each other. Of course also good. However, when the widths of the two are
different, an amount corresponding to the width of the flat speaker having the narrower width
among these flat speakers is two angles that overlook the flat speakers from the position
assumed as the center of the sweet spot. The sweet spot will spread along the dividing line.
[0030]
DESCRIPTION OF SYMBOLS 1 ... Reproduction apparatus, 10 ... Dummy head, 20 ... Recording
apparatus, 30 ... Cross talk cancellation part, 40 ... Amplifier, SP-L, SP-R ... Speaker, XL, XR, YL, YR
... Sound signal.
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