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JPH1079993

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DESCRIPTION JPH1079993
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sheet audio apparatus for reproducing music and the like, and more particularly to a sheet audio
apparatus in which crosstalk between adjacent sheets is controlled.
[0002]
2. Description of the Related Art In recent years, music and the like have been provided by
speakers embedded in sheets in trains, aircrafts, etc., and high-quality sheet audio with reduced
crosstalk between adjacent sheets as sound field control technology advances A device is
required.
[0003]
A conventional three-seat seat audio apparatus in which crosstalk noise is controlled will be
described below with reference to FIGS. 6 and 7.
FIG. 6 is a perspective view of the seat portion of the seat audio apparatus, and FIG. 7 is a
principle block diagram of the crosstalk sound control unit. 1a to 1c in the figure are sheets, 2a
to 2f are speakers, 3a to 3f are acoustic lenses, 4a to 4d are microphones, 5a to 5c are sound
sources, 6a to 6d are adaptive filters, 7a to 7f are delayers, 8a to 8c. 8 d is an adder, and 9 a to 9
f are amplifiers.
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1
[0004]
The speakers 2a to 2f are arranged in the vicinity of the listening point so that the opening faces
of the speakers 2a to 2f and the surface of the backrest of the sheets 1a to 1c substantially
coincide with each other at the height of the listening point of the sheets 1a to 1c. Be done. The
stereo signal of the sound source 5a is input to the adaptive filters 6a and 6b and the delay units
7a and 7b, and the R channel signal of the sound source 5b is simultaneously input to the
adaptive filter 6c and the delay unit 7c, and the L channel signal of the sound source 5c is the
adaptive filter 6d and the delay unit 7d. The output signal of the adaptive filter 6c and the output
signal of the delay 7a are added in the adder 8a, and at the same time the output signal of the
adaptive filter 6d and the output signal of the delay 7b are added in the adder 8b.
[0005]
The output of the adder 8a is amplified by the amplifier 9a and reproduced by the speaker 2a,
and the output of the adder 8b is amplified by the amplifier 9b and reproduced by the speaker
2b. The outputs of the adaptive filter 6a and the delay unit 7c are added by the adder 8c, and the
outputs of the adaptive filter 6b and the delay unit 7d are simultaneously added by the adder 8d.
The output of the adder 8c is amplified by the amplifier 9c and reproduced by the speaker 2c,
and the output of the adder 8d is amplified by the amplifier 9e and reproduced by the speaker
2e.
[0006]
Furthermore, the output of the L channel of the sound source 5b passes through the delay unit
7e, is amplified by the amplifier 9d and reproduced by the speaker 2d, and the output of the R
channel of the sound source 5c passes through the delay unit 7f and is amplified by the amplifier
9f and is the speaker 2f Played by. The delay units 7c and 7d delay the time required for
adaptive control in the adaptive filters 6c and 6d, and the delay units 7e and 7f correct the delay
units 7c and 7d because they are inserted in one of the stereo signals. It is a thing.
[0007]
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2
Since the reproduced sound from the speakers 2c and 2e becomes noise, that is, crosstalk sound
for the listener A, each crosstalk sound is detected by the microphones 4a and 4b, and the
adaptive filter 6c detects the detection signal from the microphone 4a. Adaptive control is
performed on the signal from the sound source 5b to reduce the crosstalk noise from the speaker
2c to the microphone 4a. Similarly, the adaptive filter 6d adaptively controls the signal from the
sound source 5c so as to make the detection signal of the microphone 4b smaller, thereby
reducing the crosstalk sound from the speaker 2e to the microphone 4b.
[0008]
In addition, the acoustic lenses 3a to 3f are disposed in the speakers 2a to 2f, and the high
frequency components are emitted to the listening points of the respective sheets 1a to 1c, and
the high frequency components are not emitted in the microphones 4a to 4d. By arranging at the
position, the crosstalk sound detected by the microphones 4a to 4d is only the low frequency
component. That is, the low frequency component of the crosstalk sound is controlled by signal
processing, and the high frequency component is controlled utilizing acoustic directivity.
[0009]
The above description is for listener A, but the same is true for listeners B and C, and for listeners
B and C, since the reproduced sound from the respective speakers 2a and 2b becomes a crosstalk
sound, each crosstalk sound Are detected by the microphones 4c and 4d, and the adaptive filter
6a adaptively controls the signal from the sound source 5a so as to reduce the detection signal of
the microphone 4c to reduce the crosstalk sound from the speaker 2a to the microphone 4c. The
adaptive filter 6b adaptively controls the signal from the sound source 5a so as to make the
detection signal of the microphone 4d smaller, thereby reducing the crosstalk sound from the
speaker 2b to the microphone 4d.
[0010]
SUMMARY OF THE INVENTION In the sheet audio apparatus of the above configuration, if the
crosstalk sound is controlled by signal processing in the entire audio frequency band, the higher
the frequency, the more difficult it is to control technically, and the adaptive filters 6a to 6d The
need for high signal processing capability makes the hardware large and expensive.
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Therefore, in order to miniaturize the hardware of the adaptive filters 6a to 6d, the band of
crosstalk sound control by signal processing is limited to the low band, and the high band uses
the acoustic characteristic of sharp directivity. For example, as described above, the acoustic
lenses 3a to 3f direct the range of the emission sound to the listening point side to control the
crosstalk sound in the high frequency range.
[0011]
Also, as shown in the figure, when the crosstalk sound is reduced by the device having two
limited speakers 2a to 2f in each of the sheets 1a to 1c, the control range is limited to the vicinity
of the listening point, and in the range other than the listening point The sound radiated from the
speakers 2a to 2f installed on each of the sheets 1a to 1d becomes noise, and furthermore, in
order to control the crosstalk sound by signal processing, the radiation sound from the speakers
2a to 2f is reflected at the listening point It is technically easier if the direct sound does not
contain sound, and the hardware of the signal processing unit can be miniaturized, so that the
volume of the speakers 2a to 2f is reduced, and there is an obstacle between the speakers 2a to
2f and the listening point It is arrange ¦ positioned in the vicinity which does not have an ear, ie,
the sheet ¦ seats 1a-1c.
[0012]
However, the crosstalk sound control by the adaptive filters 6a to 6d largely depends on the
distance between the speakers 2a to 2f and the listening point, and since the speakers 2a to 2f
are disposed near the listening point, the head position moves the listening position. If it changes,
the reduction effect of the crosstalk sound becomes smaller as the high frequency band becomes
shorter, and the sound heard by the crosstalk sound from the adjacent sheets 1a to 1c becomes
unnatural.
[0013]
Furthermore, even if the reproduced sound is radiated horizontally to the listening point by
limiting the range of the radiated sound using directivity in the high region, the sound radiated to
a region slightly away from the listener is not the listener Had a problem that it would be an
offensive noise because it was in the high range.
[0014]
An object of the present invention is to provide a low-noise sheet audio apparatus in which the
generation of crosstalk noise is small with respect to head movement.
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[0015]
SUMMARY OF THE INVENTION In order to solve the above problems, the sheet audio apparatus
according to the present invention reproduces a sheet, a bass reproduction speaker for
reproducing low frequency components of a sound source, and high frequency components of
the sound source. A speaker for high-pitched sound reproduction is provided, and at least the
speaker for low-pitched sound reproduction is disposed in the vicinity of a listening point, and
the high-pitched sound reproduction speaker has directivity controlled to emit reproduced sound
in the vertical direction to the listening point, As described above, since the directivity of the
high-pitched sound reproduction speaker is controlled to reproduce the radiated sound in the
vertical direction to the listening point, the high-pitched sound emitted by the high-pitched sound
reproduction speaker does not spread in the horizontal direction. Not only can they not be
reached directly, and the crosstalk noise of the high-pitched reproduction speaker can be
suppressed, but also the noise to the outside of the seat can be reduced.
[0016]
The invention according to claim 1 of the present invention comprises a sheet, a bass
reproduction speaker for reproducing low frequency components of a sound source, and a treble
reproduction speaker for reproducing high frequency components of the sound source. Since at
least the bass reproduction speaker is disposed in the vicinity of the listening point, and the hightone reproduction speaker has directivity controlled to emit the reproduction sound in the
vertical direction to the listening point, the high-tone reproduction speaker emits radiation. The
high-pitched sound does not spread in the horizontal direction, and it does not reach the adjacent
listener directly, so that the generation of the crosstalk sound of the high-pitched speaker is
suppressed and the noise to the outside of the sheet is also reduced.
[0017]
According to the second aspect of the present invention, in addition to the first aspect, a plurality
of sheets are disposed adjacent to each other, and a sound field is provided to reduce crosstalk
between the speakers for reproducing bass of the adjacent sheets. The correction is made, and
the crosstalk sound of the bass speaker is also reduced.
[0018]
According to a third aspect of the present invention, the loudspeaker for high-pitched sound
reproduction of the first or second aspect of the present invention is provided with a reflector
horn and disposed above the sheet to emit reproduced sound from above the listening point. To
suppress the generation of crosstalk noise.
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[0019]
The invention according to claim 4 is, in addition to the configuration according to claim 3, the
speaker for high-pitched sound reproduction as monaural reproduction, and there is no change
in the high-frequency sound due to the signal difference of the LR channel.
[0020]
According to a fifth aspect of the present invention, in the seat according to the third or fourth
aspect, the seat is provided with the leg portion and the backrest portion, the backrest portion
reclines in the longitudinal direction, and the high-sound reproduction speaker has the leg
portion The position of the high-pitched sound reproduction speaker is fixed with respect to the
legs, and does not depend on the movement of the backrest in the front-rear direction. The seat
has a reclining function and the movement of the backrest is made. It is not necessary to
consider the crosstalk sound of the high-range reproduced sound and the sound leakage to the
outside accompanying the movement, and to secure the spatial margin of the reflector horn
accompanying the movement and to consider the fall due to the change in weight balance. is
there.
[0021]
According to the sixth aspect of the present invention, in the first or second aspect of the present
invention, the high-tone reproduction speaker is disposed below the listening point, and the
sound absorbing unit is disposed on the sheet above the listening point. The reproduction sound
radiated to the area out of the listening point is absorbed by the sound absorbing section, and the
leakage sound to the outside of the sheet can be suppressed.
[0022]
Hereinafter, an embodiment of a seat audio apparatus according to the present invention will be
described with reference to FIGS.
[0023]
(First Embodiment) FIG. 1 is an external perspective view of a seat portion which is an essential
portion of an embodiment of a sheet audio apparatus according to the present invention, and FIG.
2 is a block diagram of a crosstalk sound control portion which is an essential portion. is there.
[0024]
In the figure, 10a to 10c are sheets, 11a to 11f are bass reproduction speakers, 12a to 12f are
high pitch reproduction speakers, 13a to 13f are acoustic lenses, 14a to 14d are microphones,
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15a to 15c are sound sources, 16a to 16f are sound sources Low pass filters 17a to 17f are high
pass filters, 18a to 18d adaptive filters, 19a to 19l delay units, 20a to 20d adders, and 21a to 21l
amplifiers.
[0025]
The operation in the above configuration will be described.
The low-pitched reproduction speakers 11a to 11f are symmetrical with respect to the height of
the listening points of the sheets 10a to 10c, respectively, so that the opening faces of the lowpitched reproduction speakers 11a to 11f substantially coincide with the surfaces of the
backrests of the sheets 10a to 10c. The high-tone reproduction speakers 12a to 12f are disposed
on the front surfaces of the sheets 10a to 10c so as to emit reproduction sound in the direction
perpendicular to the listening point.
[0026]
The band-divided low-pass signal path is exactly the same as in the prior art.
That is, the stereo signal of the sound source 15a is input to the adaptive filters 18a and 18b and
the delay devices 19a and 19b via the low pass filters 16a and 16b.
At the same time, the output of the R channel of the sound source 15b is input to the adaptive
filter 18c and the delay unit 19e via the low pass filter 16c, and the output of the L channel of
the sound source 15c is input to the low pass filter 16e, and is input to the adaptive filter 18d
and the delay unit 19i. It is input.
[0027]
The output signal of the adaptive filter 18c and the output signal of the delay 19a are added in
the adder 20a, while the output signal of the adaptive filter 18d and the output signal of the
delay 19b are added in the adder 20b.
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The output of the adder 20a is amplified by the amplifier 21a and reproduced by the bass
reproduction speaker 11a. At the same time, the output of the adder 20b is amplified by the
amplifier 21b and reproduced by the bass reproduction speaker 11b.
The outputs of the adaptive filter 18a and the delay unit 19e are added by the adder 20c, and the
outputs of the adaptive filter 18b and the delay unit 19i are simultaneously added by the adder
20d.
The output of the adder 20c is amplified by the amplifier 21e and reproduced by the bass
reproduction speaker 11c, and the output of the adder 20d is amplified by the amplifier 21i and
reproduced by the bass reproduction speaker 11e.
[0028]
Further, the output of the L channel of the sound source 15b passes through the low pass filter
16d and the delay device 19f, is amplified by the amplifier 21f and reproduced by the bass
reproduction speaker 11d. The output of the R channel of the sound source 15c is the low pass
filter 16f and the delay device 19j , And amplified by the amplifier 21j and reproduced by the
bass reproduction speaker 11f.
The delayers 19e and 19i delay the time required for the adaptive control in the adaptive filters
18c and 18d, and the delayers 19f and 19j correct the delayers 19e and 19i because they are
inserted in one of the stereo signals. It is a thing.
[0029]
By the way, to the listener A, the reproduced sound from the low-pitched sound reproduction
speakers 11c and 11e becomes noise, that is, crosstalk sound.
Each crosstalk sound is detected by the microphones 14a and 14b.
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The adaptive filter 18 c adaptively controls the signal from the sound source 15 b so as to reduce
the detection signal of the microphone 14 a to reduce crosstalk noise from the bass reproduction
speaker 11 c to the microphone 14 a.
Similarly, the adaptive filter 18d adaptively controls the signal from the sound source 15c so as
to reduce the detection signal of the microphone 14b to reduce crosstalk noise from the bass
reproduction speaker 11e to the microphone 14b.
[0030]
The above described the listener A, but the same applies to the listeners B and C.
To the listeners B and C, the reproduction sound from each of the bass reproduction speakers
11a and 11b becomes a crosstalk sound.
Each crosstalk sound is detected by the microphones 14c and 14d.
The adaptive filter 18a adaptively controls the signal from the sound source 15a so as to make
the detection signal of the microphone 14c smaller, and reduces the crosstalk sound from the
bass reproduction speaker 11a to the microphone 14c.
Similarly, the adaptive filter 18b adaptively controls the signal from the sound source 15a so as
to make the detection signal of the microphone 14d smaller, thereby reducing the crosstalk
sound from the bass reproduction speaker 11b to the microphone 14d.
[0031]
On the other hand, unlike the prior art, the stereo signal of the sound source 15a is also input to
the high pass filters 17a and 17b, and the output of the high pass filters 17a and 17b is the time
of the divided high band signal, unlike the conventional example. For correction, they are
amplified by the amplifiers 21c and 21d via the delayers 19c and 19d and reproduced by the
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high-tone reproduction speakers 12a and 12b. The output of the sound source 15b is also input
to the high pass filters 17c and 17d, amplified by the amplifiers 21g and 21h via the delayers
19g and 19h, respectively, and reproduced by the high sound reproduction speakers 12c and
12d. Similarly, the output of the sound source 15c is also input to the high pass filters 17e and
17f, amplified by the amplifiers 21k and 21l via the delayers 19k and 19l, respectively, and
reproduced by the high-tone reproduction speakers 12e and 12f.
[0032]
The delayers 19g, 19h, 19k, 19l are inserted for correcting the time required for the adaptive
filters 18c, 18d inserted into one of the low-pass side stereo signals.
[0033]
By the way, although the reproduced sound from the high-tone reproduction speakers 12c and
12e is a crosstalk sound for the listener A, the directivity is controlled by the acoustic lenses 13c
and 13e, and the high-tone sound is emitted in the vertical direction to the listening point The
crosstalk noise from the high-tone reproduction speakers 12c and 12e can be reduced.
The same applies to the listeners B and C. For listeners B and C, the reproduced sound from the
high-tone reproduction speakers 12a and 12b is a crosstalk sound, but the acoustic lenses
provided on the acoustic lenses 13a and 13b receive the reproduced sound from the high-tone
reproduction speakers 12a and 12b. Since the sound is radiated to the listener A in the vertical
direction, crosstalk noise from the high-tone reproduction speakers 12a and 12b can be reduced.
[0034]
Therefore, as in the conventional example, the crosstalk noise is reduced by signal processing in
the low frequency range, and the crosstalk noise is reduced by reducing the sound leakage in the
horizontal direction by reproducing the radiation noise in the vertical direction to the listening
point in the high frequency range. It is reduced regardless of signal processing. Therefore, if the
high sound reproduction speakers 12a to 12f are set at a distance from the listening point with
the radiation sound of the high sound reproduction speakers 12a to 12f in the vertical direction,
the radiation area at the listening point is expanded and head movement is achieved. On the
other hand, since the variation of the distance between the high-tone reproduction speakers 12a
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10
to 12f and the listening point is small, the deterioration of the sound quality is small, and
additionally, the radiated sound is reproduced in the vertical direction. It can be an apparatus.
[0035]
In the present embodiment, the acoustic lenses 13a to 13f are disposed on the high-tone
reproduction speakers 12a to 12f, but horns may be disposed, and listening points in the normal
direction of the opening surface of the high-tone reproduction speakers 12a to 12f It is not
necessary to arrange the acoustic lenses 13a to 13f if. Further, the crosstalk sound control by the
signal processing is not limited to the embodiment, and any other method may be used as long as
it controls only the low frequency reproduction sound.
[0036]
(Embodiment 2) FIG. 3 is an external perspective view of a seat portion which is a main portion
of another embodiment, and FIG. 4 is a block diagram of a crosstalk sound control portion which
is the same portion.
[0037]
Referring to FIG. 20, reference numerals 20e to 20g denote adders, and reference numerals 22a
to 22c denote reflector horns. The same parts as in the first embodiment are denoted by the
same reference numerals.
A major difference from Embodiment 1 is that reflector horns 22a to 22c having a substantially
hemispherical shell shape are provided on the high-sound reproduction speakers 12a to 12f
instead of the acoustic lens, and one is disposed above the respective sheets 10a to 10c. This
means that the high frequency component is reproduced in monaural.
[0038]
The operation of the second embodiment will be described below. The signal path of the banddivided low-pass component and the behavior of the reproduced sound are completely the same
as in the first embodiment, and the crosstalk sound between the adjacent sheets 10a to 10c is
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11
reduced by signal processing. On the other hand, the behavior of the signal path of the banddivided high frequency component and the behavior of the reproduced sound is different from
that of the first embodiment.
[0039]
That is, after adding stereo signals from the sound sources 15a to 15c by the adders 20e to 20g
to form monaural signals and passing through the high pass filters 17a, 17c, and 17e, the signal
processing time required to reduce crosstalk noise of low frequency components Are delayed by
the delay devices 19c, 19g and 19k, and monaural reproduction is performed by the high-tone
reproduction speakers 12a, 12c and 12e having the reflector horns 22a to 22c via the amplifiers
21c, 21g and 21k.
[0040]
Here, if the directivity control range of the reflector horns 22a to 22c is set to the range of
practical head movement, the sound quality deterioration due to the crosstalk sound in the high
region with respect to the head movement is small and monaural reproduction is performed.
There is no change in the high frequency range tone due to the signal difference of the LR
channel at the time of part movement.
Also in the second embodiment, the high frequency component is radiated from above to the
listening point in the vertical direction, and the radiation range of the reproduced sound is
limited by the reflector horns 22a to 22c. It is possible to provide a sheet audio apparatus in
which the crosstalk noise in the high region between the sheets 10a to 10c is reduced.
[0041]
The reproduction path of the high frequency band signal component in the second embodiment
is merely an example, and the present invention is not limited to this.
[0042]
In the second embodiment, the legs of the sheets 10a to 10c and the reflector horns 22a to 22c
are joined, and the reclining of the sheets 10a to 10c is different from the reflector horns 22a to
22c and the legs of the sheets 10a to 10c. The positional relationship is fixed.
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[0043]
That is, by joining the reflector horns 22a to 22c to the legs of the sheets 10a to 10c, when the
backrest has a reclining function, the positions of the reflector horns 22a to 22c are made
constant with respect to the respective legs. Since the positions of the reflector horns 22a to 22c
do not move while reclining the backrest, the crosstalk sound of the high-range reproduction
sound and the sound leakage to the outside are not changed due to the movement of the
backrest.
In addition, it is not necessary to secure a spatial margin accompanying the movement of the
reflector horns 22a to 22c and to consider a fall due to a change in weight balance.
[0044]
Although the reflector horns 22a to 22c are fixed to the legs in the second embodiment, for
example, they may be fixed to the seat to prevent the reflector horns 22a to 22c from moving
along with the reclining of the backrest.
In addition, the reflector horns 22a to 22c may be suspended from above the sheets 10a to 10c
without being fixed to the sheets 10a to 10c.
[0045]
(Third Embodiment) FIG. 5 is an external perspective view of another embodiment, and according
to the same figure, reference numerals 23a to 23c denote sound absorbing parts installed above
the sheets 10a to 10c, respectively. The same parts are given the same numbers. A major
difference from the first embodiment is that the high-tone playback speakers 12a to 12f are
arranged to emit playback sound in the vertical direction from the lower part of the listening
point to the listening point, and sound absorbing parts 23a to 23c are provided above the
listening point. It is
[0046]
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The operation of the third embodiment will be described below. The signal path of the banddivided low-pass component and the behavior of the reproduced sound are the same as in the
first embodiment, and the crosstalk noise between the adjacent sheets 10a to 10c is reduced by
the signal processing. On the other hand, although the signal path of the high-frequency
component is the same as that of the first embodiment and acoustically reduces the crosstalk
sound, the behavior of the radiated reproduction sound is different. That is, the reproduced
sound from the high-tone reproduction speakers 12a to 12f arranged below the listening point of
each of the sheets 10a to 10c has its directivity controlled by the acoustic lenses 13a to 13f and
is radiated vertically upward to the listening point. There is little radiation noise in the direction,
and crosstalk noise between adjacent sheets 10a to 10c can be reduced.
[0047]
Further, since the reproduced sound radiated to the area out of the listening point is absorbed by
the sound absorbing units 23a to 23c, the leaked sound to the outside of the sheets 10a to 10c is
reduced, and the noise is reduced. Also in the third embodiment, as in the first embodiment, the
distance between the high-tone reproduction speakers 12a to 12f and the listening point is
provided to set the radiation area in the vicinity of the listening point as a practical head
movement range. It is possible to make a sheet audio apparatus with less deterioration in sound
quality against part movement.
[0048]
In the third embodiment, the directivity is controlled using the acoustic lenses 13a to 13f as in
the first embodiment. However, a horn may be used, and the method of the opening surface of
the high-sound reproduction speakers 12a to 12f may be used. If a listening point exists in the
line direction, the acoustic lenses 13a to 13f or the like may not be used.
[0049]
In addition, although the control of crosstalk noise between adjacent three sheets 10a to 10c has
been described in the third embodiment, the number of sheets is not limited to this.
Furthermore, a sheet may be used alone without performing signal processing for reducing
crosstalk noise of low frequency components, and in this case, a low-noise sheet audio apparatus
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14
with small leakage noise of high frequencies can be realized. .
[0050]
As described above, according to the present invention, the bass reproduction speaker is
disposed in the vicinity of the listening point of the seat, and the high-tone reproduction speaker
is disposed adjacent to the listening point so as to emit the reproduction sound in the vertical
direction. The present invention provides a sheet audio apparatus which reduces crosstalk noise
between sheets by signal processing in the low band and by utilizing acoustic directivity in the
high band, and the high-pitched sound reproduction speaker is vertically oriented to the listening
point. By arranging to emit the playback sound, even if the radiation area near the listening point
in the horizontal direction in the high band is expanded to the head movement range, there is
little horizontal sound leakage and noise to the outside of the seat and the head It is possible to
reduce the sound quality deterioration at the time of part movement.
[0051]
Brief description of the drawings
[0052]
1 is an external perspective view of a seat portion which is a main portion of the seat audio
apparatus according to the first embodiment of the present invention.
[0053]
Fig. 2 Block diagram of the crosstalk sound control unit
[0054]
Fig. 3 is an external perspective view of a seat portion which is an essential portion of the other
embodiment.
[0055]
Fig. 4 Block diagram of the crosstalk sound control unit
[0056]
Fig. 5 is an external perspective view of a seat portion which is an essential portion of the other
embodiment.
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[0057]
Fig. 6 is an external perspective view of the seat portion of the conventional seat audio apparatus
[0058]
Fig. 7 Block diagram of the crosstalk sound control unit
[0059]
Explanation of sign
[0060]
10a to 10c Seats 11a to 11f Bass Reproduction Speakers 12a to 12f High-tone Reproduction
Speakers 13a to 13f Acoustic Lenses 14a to 14d Microphones 15a to 15c Sound Sources 16a to
16f Lowpass Filters 17a to 17f Highpass Filters 18a to 18d Adaptive Filters 19a to 19l Delays
20a to 20d Adder 21a to 21l Amplifier 22a to 22c Reflector horn
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