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JPH07288885

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DESCRIPTION JPH07288885
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic device provided for providing music to a passenger, for example, in a seat arranged at
least in front, rear, left and right directions, such as a seat provided in a cabin of a passenger
aircraft. It is a thing.
[0002]
2. Description of the Related Art For example, as an acoustic device provided for providing music
to a passenger in a seat of a passenger cabin of a passenger aircraft, it has conventionally been
used by being attached to the ear of a passenger in the air tube type or headphone type. Are
being implemented. However, such a type of device worn on the passenger's ear has a feeling of
discomfort due to being worn on the passenger's ear, and there has been a problem particularly
in long-term use .
[0003]
On the other hand, for example, in the cabin of a passenger aircraft, noise such as engine noise is
full, and in conventional acoustic devices such as a headphone type, the sound volume is
relatively raised to overcome the noise. However, there is a limit to raising the volume, and if the
volume is increased too much, sound leakage from the headphones may cause new noise.
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[0004]
In addition, in an audio apparatus such as a headphone type, an apparatus has been proposed
which detects external noise and superposes a signal for canceling out the external noise on the
acoustic signal to remove the external noise. However, the hassle of wearing headphones has not
been solved, and keeping them worn, especially when sleeping, can be both uncomfortable and
risky.
[0005]
SUMMARY OF THE INVENTION The present application has been made in view of these points,
and the problem to be solved is that the type of device used by being worn on the passenger's
ear is: The passenger is uncomfortable due to being worn on the ear, and there is a problem
particularly in using for a long time.
[0006]
A first means according to the present invention is an acoustic device provided in a seat arranged
at least in the front, rear, left, and right directions, wherein the head support portion 1 of the seat
is provided with voice generating means 11R, 11L. An acoustic device is characterized in that the
directivity characteristic of the voice generation means is directed in the direction toward the
front of the center of the back support 2 of the seat.
[0007]
According to a second means of the present invention, in the acoustic device according to the
first means, the directivity characteristics of the voice generating means 11R, 11L are set to the
position where the back support portion 2A of the seat A is most inclined. The acoustic device is
characterized in that it does not face in the direction of the head support portion 1B.
[0008]
A third means according to the present invention is the acoustic device according to the first
means, wherein the voice generating means 11R, 11L comprises a speaker 12 and a reflecting
plate 13, and the directivity characteristic of this speaker is the back support 2A of the seat A In
the most inverted position so as not to head toward the head support portion 1C of the rear seat
C, and the directivity characteristic of the reflecting plate is the front position B of the seat in the
most inverted position. It is an acoustic apparatus characterized in that it does not face in the
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direction of the head support portion 1B.
[0009]
According to a fourth means of the present invention, in the acoustic device according to the first
means, microphones 18R and 18L for picking up external noise are provided in the vicinity of
the voice generating means 11R and 11L, and signals from the microphones are used. It is an
acoustic apparatus characterized in that signals (signal processing circuits 19R and 19L) for
canceling out the external noise are superimposed on the signal supplied to the voice generation
means.
[0010]
A fifth means according to the present invention is the acoustic device according to the first
means, wherein the voice generation means 11R, 11L is supplied with an acoustic signal of a
medium band or more on the acoustic frequency characteristic, and the low frequency on the
acoustic frequency characteristic The acoustic signal is supplied to the acoustic reproduction
means 21 embedded in the back support 2 of the seat.
[0011]
According to this, the head support portion of the seat is provided with the voice generation
means, and the directivity characteristic of the voice generation means is directed toward the
front side of the center of the back support portion of the seat. It is possible to receive good
music etc. without wearing it.
[0012]
In addition, the directional characteristic of the voice generation means can reduce the
occurrence of sound leakage and the like by preventing the back support portion of the seat from
being directed in the direction of the head support portion of the front seat at the most inclined
position.
[0013]
Further, the voice generation means comprises a speaker and a reflector, and the directivity
characteristic of the speaker is such that the back support of the seat is not directed toward the
head support of the rear seat at the most inclined position, and By making the directional
characteristics not point toward the head support of the front seat in the most inverted position
of the seat back support, extremely sharp directional characteristics can be obtained, especially
by the combination of the speaker and the reflector, The above-described acoustic device can be
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implemented extremely effectively.
[0014]
Further, a microphone for picking up external noise is provided in the vicinity of the voice
generation means, and a signal from this microphone is used to superimpose a signal for
canceling the external noise on the signal supplied to the voice generation means. Noise can be
removed well, and the seat can be created with a noise field removed of external noise.
[0015]
Furthermore, the vocalization means is supplied with an acoustic signal of a mid band or more on
the acoustic frequency characteristic, and the low frequency acoustic signal on the acoustic
frequency characteristic is supplied to the acoustic reproduction means embedded in the back
support of the seat. By doing this, the effect of the low-range acoustic signal on the acoustic
frequency characteristic can be particularly well obtained.
[0016]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT In FIG. 1, A is a front view of one of
the seats arranged at least in the front, rear, left and right directions, for example, a seat provided
in a passenger cabin of a passenger aircraft. FIG.
In these figures, 1 shows a head support part (headrest), 2 shows a back support part (backrest
part).
[0017]
The head support portion 1 is further provided with wing portions 10R and 10L on the left and
right, and the wing portions 10R and 10L are provided with voice generating means 11R and
11L.
Each of the voice generating means 11R, 11L is made of, for example, a speaker and a reflector,
and a combination of the speaker and the reflector makes it possible to obtain extremely sharp
directivity.
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[0018]
That is, these voice generating means 11 are composed of a speaker 12 and a reflector 13 as
shown in FIG. 2, for example.
Then, by reflecting the sound from the speaker 12 by, for example, the substantially elliptical
hemispherical reflector 13, extremely sharp directivity can be obtained for the sound reflected by
the reflector 13.
Further, in FIG. 1, a sound reproducing unit 21 is embedded in the back support portion 2.
[0019]
And in this device, the directivity characteristic of the sound reflected by the reflection plate 13
of the above-mentioned voice generation means 11R, 11L is made to be directed in the direction
toward the front of the center of the back support 2 of the seat.
Furthermore, as shown in FIG. 3, in the directional characteristic, the directional characteristic a
of the above-mentioned speaker 12 does not face in the direction of the head support 1C of the
rear seat C at the position where the back support 2A of the seat A is turned down most It will be.
Also, similarly, the directivity characteristic b of the reflecting plate 13 is not directed toward the
head support portion 1B of the front seat B.
[0020]
Therefore, in this device, the directional characteristics of the sound from the voice generating
means 11R, 11L are in the direction from the ear of the passenger of the seat A to the shoulder.
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This allows the passenger to listen to this sound without using headphones etc. to be released
from discomfort due to wearing the headphones etc. in the ear, and to listen to the sound
comfortably even when playing for a long time especially Can.
[0021]
Further, since the voice generation means 11R, 11L have extremely sharp directional
characteristics by the above-described configuration, the sound in the direction slightly deviated
from the direction of the directional characteristics becomes extremely small.
For this reason, as described above, for the seats B and C on the left and right as well as on the
front and back, the directivity characteristics are not directed in the direction of the head
supports 1B and 1C, thereby causing problems such as sound leakage to the surroundings. Can
be eliminated.
[0022]
Thus, according to the above-described apparatus, the head support 1 of the seat is provided
with the voice generating means 11R, 11L, and the directivity characteristics of the voice
generating means 11R, 11L are directed toward the front side of the center of the back support 2
of the seat. Thus, it is possible to receive good music and the like without wearing headphones
and the like.
[0023]
In addition, the directional characteristics of the voice generation means 11R, 11L are such that
the sound leakage etc. is generated by not directing the back support 2A of the seat A in the
direction of the head support 1B of the front seat B at the most inclined position. Can be reduced.
[0024]
Further, the voice generating means 11R, 11L are composed of the speaker 12 and the reflector
13. The directivity characteristic of the speaker 12 is in the direction of the head support 1C of
the rear seat C at a position where the back support 2A of the seat A is most inclined. In
particular, the speaker 12 is made not to face, as the directivity characteristic of the reflector 13
does not face the head support 1B of the front seat B at the position where the back support 2A
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of the seat A is turned most down. The combination of the light source and the reflection plate
13 makes it possible to obtain extremely sharp directional characteristics, and the abovedescribed acoustic device can be extremely effectively realized.
[0025]
Furthermore, in the above-described apparatus, the signal processing circuit as shown in FIG. 4
performs noise reduction signal processing on the acoustic signals supplied to the speakers 12R
and 12L of the voice generation means 11R and 11L.
[0026]
That is, in FIG. 4, 14R and 14L are input terminals to which acoustic signals such as music
provided to passengers are supplied.
The acoustic signals supplied to the input terminals 14R and 14L are supplied to the high pass
filters (HPF) 16R and 16L through the switches 15R and 15L, respectively.
As a result, from the high pass filters 16R and 16L, acoustic signals of the middle band or more
on the acoustic frequency characteristic are extracted respectively.
These acoustic signals are respectively supplied to the speakers 12R and 12L which constitute
the above-mentioned voice generation means 11R and 11L through the amplifiers 17R and 17L.
[0027]
Further, microphones 18R, 18L for picking up external noise are provided in the vicinity of the
speakers 12R, 12L that constitute the above-mentioned voice generation means 11R, 11L.
The external noises picked up by the microphones 18R and 18L are supplied to signal processing
circuits 19R and 19L that form noise removal signals that cancel the external noises,
respectively.
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The noise removal signals formed by the signal processing circuits 19R and 19L are supplied to
the amplifiers 17R and 17L, respectively, and added to the signals from the high pass filters 16R
and 16L.
[0028]
Further, the signals from the switches 15R and 15L are supplied to low pass filters (LPFs) 22R
and 22L.
As a result, low-pass acoustic signals having acoustic frequency characteristics are extracted
from the low-pass filters 22R and 22L.
These acoustic signals are respectively supplied to the amplifier 23 and added, and this addition
signal is supplied to the acoustic reproduction means 21 embedded in the above-mentioned back
support portion 2.
[0029]
Therefore, in this device, the speakers 12R and 12L respectively add to the acoustic signal and
output a noise removal signal for canceling out external noise. As a result, in the seat, for
example, noises such as engine noise in the cabin of the passenger aircraft can be offset to create
a sound field from which external noises have been removed.
[0030]
That is, in this device, the signal processing circuits 19R and 19L perform signal processing as
shown in FIG. 5, for example, with respect to the microphones 18R and 18L. First, A in FIG. 5 is
an example of a simple circuit, and a signal from the microphone 18 is supplied to the filter 31 of
the audio signal band. The signal from the filter 31 is supplied to the inverting circuit 32 to
invert the phase of the signal. The signal whose phase is inverted is taken out through the delay
circuit 33 to the output terminal 34 of the noise removal signal.
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[0031]
As a result, the speakers 12R and 12L output a noise removal signal obtained by inverting the
external noise collected by the microphones 18R and 18L, and the noise removal signal cancels
the external noise. In the above-mentioned delay circuit 33, the timings of the external noise and
the noise removal signals from the speakers 12R and 12L are equal according to the distance
between the speakers 12R and 12L and the microphones 18R and 18L and the delay time of
each circuit. Adjustment of the delay time is performed.
[0032]
Alternatively, as shown in FIG. 5B, the signal from the microphone 18 is supplied to the filter 41
of the audio signal band. A signal from the filter 41 is supplied to a transfer function calculation
processing circuit 42, and a signal from the calculation processing circuit 42 is supplied to a
convolution calculation processing circuit 43 to form a noise removal signal obtained by
inverting external noise. The formed noise removal signal is taken out at the output terminal 44.
This also cancels out external noise by this denoised signal.
[0033]
Thus, according to the above-described apparatus, the microphones 18R and 18L for collecting
external noise are provided in the vicinity of the voice generation means, and the signals from
the microphones 18R and 18L are used to output the signals supplied to the voice generation
means 11R and 11L. By superimposing noise canceling signals (signal processing circuits 19R
and 19L), external noise can be removed well, and a sound field with external noise removed can
be created in the seat. is there.
[0034]
Therefore, in this device, since a sound field from which external noise is removed can be created
in the seat, the volume of the acoustic signal output from the speakers 12R, 12L can be reduced,
and the occurrence of sound leakage to the surroundings is further enhanced. It can be made
smaller.
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Further, the sound leakage from the surrounding speakers 12R and 12L is also eliminated as well
as the external noise, and the problem of the sound leakage can be solved as a whole.
[0035]
Furthermore, by turning off the above-mentioned switches 15R and 15L, only the removal of
external noise can be performed without outputting the acoustic signal from the speakers 12R
and 12L. As a result, noise such as a seat engine sound can be reduced, and a good sound field
can be formed when sleeping.
[0036]
Further, in FIG. 4 described above, the signals from the switches 15R and 15L are added to the
acoustic signal of the low band by the amplifier 23 through the low pass filters 22R and 22L and
supplied to the acoustic reproduction means 21 embedded in the back support 2. Ru. As a result,
it is possible to make the low band acoustic signal which is easily mixed with the low band
external noise directly felt from the back of the passenger, and to realize the effect of the low
band acoustic signal.
[0037]
Thus, according to the above-described apparatus, the vocalization means (speakers 12R and
12L) are supplied with an acoustic signal of a mid band or more on the acoustic frequency
characteristic, and a low acoustic signal on the acoustic frequency characteristic is the seat back
support By supplying to the sound reproduction means 21 embedded in 2, it is possible to obtain
the effect of the low-range sound signal particularly on the sound frequency characteristic well.
[0038]
The above-described audio device is not limited to a seat provided in a cabin such as a passenger
aircraft, and can be applied to any audiovisual system such as an audiovisual booth such as a
museum.
[0039]
According to the present invention, the head support of the seat is provided with the voice
generating means, and the directivity characteristic of the voice generating means is directed
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toward the front of the center of the back support of the seat. It became possible to receive
provision of good music without wearing headphones and the like.
[0040]
In addition, it is possible to reduce the occurrence of sound leakage and the like by preventing
the direction of the back support of the seat from heading toward the head support of the front
seat at the position where the back support of the seat is turned most down Became.
[0041]
Further, the voice generation means comprises a speaker and a reflector, and the directivity
characteristic of the speaker is such that the back support of the seat is not directed toward the
head support of the rear seat at the most inclined position, and By making the directional
characteristics not point toward the head support of the front seat in the most inverted position
of the seat back support, extremely sharp directional characteristics can be obtained, especially
by the combination of the speaker and the reflector, It became possible to realize the abovedescribed acoustic device extremely effectively.
[0042]
Further, a microphone for picking up external noise is provided in the vicinity of the voice
generation means, and a signal from this microphone is used to superimpose a signal for
canceling the external noise on the signal supplied to the voice generation means. Noise can be
removed well, and it is possible to create a sound field with external noise removed in the seat.
[0043]
Furthermore, the vocalization means is supplied with an acoustic signal of a mid band or more on
the acoustic frequency characteristic, and the low frequency acoustic signal on the acoustic
frequency characteristic is supplied to the acoustic reproduction means embedded in the back
support of the seat. As a result, the effects of the low-range acoustic signal on the acoustic
frequency characteristic can be obtained well.
[0044]
Brief description of the drawings
[0045]
1 is a block diagram of an example of an acoustic device according to the present invention.
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[0046]
2 is a block diagram of a specific example of the utterance means.
[0047]
3 is a diagram for explaining the acoustic device according to the present invention.
[0048]
4 is a block diagram of an example of a signal processing circuit of the acoustic device according
to the present invention.
[0049]
5 is a block diagram of a specific circuit example thereof.
[0050]
Explanation of sign
[0051]
1 head support portion (headrest) 2 back support portion (backrest portion) 10R, 10L wing
portion 11R, 11L vocalizing means 12 speaker 13 reflection plate 14R, 14L input terminal 15R,
15L switch 16R, 16L high pass filter (HPF) 17R, 17L Amplifier 18R, 18L Microphone 19R, 19L
Signal processing circuit 21 Sound reproduction means 22R, 22L Low pass filter (LPF) 23
Amplifier 31, 41 Filter 32 Inversion circuit 33 Delay circuit 34, 44 Output terminal 42 Transfer
function calculation circuit 43 Convolution operation circuit A , B, C Seat 1A, 1B, 1C Head
support 2A, 2B, 2C Back support a, b Directional characteristics
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