JPH07288885A - Audio system - Google Patents

Abstract

PURPOSE:To provide satisfactory music or the like without mounting any headphone, etc. CONSTITUTION:This system is provided with a head supporting part (head rest) 1 and a back supporting part (back rest part) 2. The head supporting part 1 is further provided with right and left wing parts 10R and 10L, and these wing parts 10R and 10L are equipped with sounding means 11R and 11L. These sounding means 11R and 11L are respectively composed of speakers and reflection panels (not shown in the figure) and extremely sharp orientating characteristics can be provided by combining these speakers and reflection panels. At such a system, the directional characteristics of sounds reflected on the reflection panels of these sounding means 11R and 11L are directed toward the front side of the back supporting part 2 at a seat. Further, an audio reproducing means 21 is embedded in the back supporting means 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acoustic device provided to provide passengers with music or the like in seats arranged at least in the front-rear, left-right direction, such as seats provided in passenger cabins of passenger aircraft. It is a thing.

[0002]

2. Description of the Related Art For example, an audio device provided in a seat in a passenger cabin of a passenger aircraft to provide music to passengers has been conventionally used by being attached to passengers' ears of air tube type or headphone type. Things are being implemented. However, in such a device that is used by being worn on the passengers' ears, there is a discomfort caused by the passengers wearing the device on their ears, and there is a problem in using the device for a long time. .

On the other hand, noise such as engine noise is filled in the passenger cabin of a passenger aircraft, for example, and the conventional headphone type acoustic device has been designed to relatively increase the volume in order to overcome the noise. However, there is a limit to raising the volume, and if the volume is raised too high, sound may leak from the headphones, which may cause new noise.

Also, in a headphone type acoustic device, a device has been proposed which detects external noise and superimposes a signal for canceling the external noise on the acoustic signal to remove the external noise. However, the annoyance of wearing headphones has not been solved, and keeping the headphones on, especially during sleep, may be both uncomfortable and dangerous.

[0005]

This application was made in view of the above-mentioned problems, and the problem to be solved is that the device of the type worn on the ears of passengers is There is discomfort for passengers wearing on their ears,
It is said that there was a problem in using it especially for a long time.

[0006]

A first means according to the present invention is an acoustic device provided on a seat arranged at least in the front-rear, left-right direction, wherein head-supporting portion 1 of the seat is provided with voicing means 11R, 11L. The directional characteristics of this vocalization means
The acoustic device is characterized in that it is directed toward the front side of the center of the back support portion 2 of the seat.

According to a second aspect of the present invention, in the acoustic device according to the first aspect, the directional characteristics of the voicing means 11R and 11L are such that the back support portion 2A of the seat A is at the most tilted position and the directional characteristic is forward. The acoustic device is characterized in that it is not oriented toward the head support portion 1B of the seat B.

According to a third means of the present invention, in the acoustic device according to the first means, the voicing means 11R and 11L are composed of a speaker 12 and a reflection plate 13, and the directional characteristic of the speaker is the back of the seat A. At the most tilted position of the support portion 2A, it should not be directed toward the head support portion 1C of the seat C at the rear, and the directional characteristics of the reflector should be at the most tilted position of the back support portion of the seat. The acoustic device is characterized in that it is not oriented toward the head support portion 1B of the seat B.

According to a fourth means of the present invention, in the acoustic device according to the first means, microphones 18R, 18 for picking up external noise near the voicing means 11R, 11L.
L is provided, and a signal (signal processing circuits 19R and 19L) for canceling the external noise is superimposed on the signal supplied to the voicing means by using the signal from the microphone. Is.

According to a fifth aspect of the present invention, in the acoustic device according to the first aspect, the voicing means 11R and 11L are supplied with an acoustic signal in the middle band or higher on the acoustic frequency characteristic,
The acoustic signal in the low frequency range on the acoustic frequency characteristic is supplied to the acoustic reproduction means 21 embedded in the back support portion 2 of the seat.

[0011]

According to this, the headphone support portion of the seat is provided with the voicing means, and the directional characteristic of the voicing means is directed toward the front side of the center of the back support portion of the seat. You can receive good music without wearing it.

Further, the directional characteristic of the voicing means is to prevent the sound leakage from occurring by making the back support portion of the seat not to face the head support portion of the front seat at the most tilted position. You can

Further, the voicing means is composed of a speaker and a reflector, and the directional characteristics of the speaker prevent the back support portion of the seat from being directed to the head support portion of the rear seat at the most tilted position. By setting the directional characteristics of the reflector so that it does not face the head support of the front seat at the most tilted position of the back support of the seat, it is possible to obtain extremely sharp directional characteristics especially by combining the speaker and the reflector. Therefore, the above acoustic device can be realized very effectively.

Further, a microphone for picking up external noise is provided in the vicinity of the voicing means, and a signal from this microphone is used to superimpose a signal for canceling the external noise on the signal supplied to the voicing means. With this, external noise can be removed well, and a sound field from which external noise is removed can be created in the seat.

Further, the vocalizing means is supplied with an acoustic signal in the middle band or higher in the acoustic frequency characteristic, and the acoustic signal in the low frequency range in the acoustic frequency characteristic is supplied to the acoustic reproducing means embedded in the back support portion of the seat. By doing so, it is possible to favorably obtain the effect of the acoustic signal in the low frequency range on the acoustic frequency characteristic.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, A is a front view of one of the seats arranged in at least the front, rear, left, and right directions, such as a seat provided in a passenger cabin of a passenger plane, and B is a side view thereof. It is a figure. In these figures, 1 indicates a head support portion (headrest), and 2 indicates a back support portion (backrest portion).

The head support portion 1 is further provided with wing portions 10R and 10L on the left and right sides, and voicing means 11R and 11L are provided on the wing portions 10R and 10L. Each of the voicing means 11R and 11L is composed of, for example, a speaker and a reflection plate, and an extremely sharp directional characteristic is obtained by combining these speakers and the reflection plate.

That is, these voicing means 11 are composed of a speaker 12 and a reflector 13 as shown in FIG. 2, for example. Then, the sound from the speaker 12 is reflected by, for example, a substantially elliptic hemispherical reflector plate 13,
An extremely sharp directional characteristic can be obtained for the sound reflected by the reflector 13. Further, in FIG. 1, a sound reproducing means 21 is embedded in the back support portion 2.

In this device, the directional characteristics of the sound reflected by the reflection plate 13 of the above-mentioned voicing means 11R and 11L are directed toward the front side of the center of the back support portion 2 of the seat. Further, as shown in FIG. 3, this directional characteristic is such that the directional characteristic a of the speaker 12 is not oriented toward the head support portion 1C of the rear seat C at the position where the back support portion 2A of the seat A is most tilted. To be done. Similarly, the directional characteristic b of the reflection plate 13 is not directed toward the head support portion 1B of the front seat B.

Therefore, in this device, the voicing means 11
The directional characteristics of the sound from the R and 11L are in the direction from the ear of the passenger in the seat A to the shoulder. This allows passengers to listen to this sound without using headphones, etc., to relieve the discomfort of wearing headphones etc. in their ears, and especially to listen to the sound comfortably even for long periods of time. You can

Further, the voicing means 11 has the above-mentioned configuration.
Since R and 11L have an extremely sharp directional characteristic, sound in a direction slightly deviating from the direction of this directional characteristic becomes extremely small. Therefore, as described above, the directional characteristics of the head supporting portions 1B, 1
By not facing the direction of 1C, problems such as sound leakage to the surroundings can be solved.

Thus, according to the above-mentioned device, the head support portion 1 of the seat is provided with the vocalizing means 11R and 11L, and the directional characteristics of the vocalizing means 11R and 11L are directed toward the front side of the center of the back support portion 2 of the seat. By being directed, good music and the like can be provided without wearing headphones or the like.

Further, the directional characteristics of the voicing means 11R, 11L are set so that the back support portion 2A of the seat A is not tilted toward the head support portion 1B of the front seat B at the most tilted position. It is possible to reduce the occurrence of such as.

Further, the voicing means 11R, 11L comprises a speaker 12 and a reflector plate 13.
The directional characteristics of the back support portion 2A of the seat A are set so as not to face the head support portion 1C of the rear seat C at the most tilted position, and the directional characteristic of the reflector 13 is set to the back support portion 2 of the seat A.
By setting A so as not to face the head support portion 1B of the seat B at the frontmost position, it is possible to obtain an extremely sharp directional characteristic especially by the combination of the speaker 12 and the reflector 13. The device can be realized very effectively.

Further, in the above device, the voicing means 11
The acoustic signals supplied to the R and 11L speakers 12R and 12L are subjected to noise reduction signal processing by a signal processing circuit as shown in FIG.

That is, in FIG. 4, 14R, 14
L is an input terminal 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, the high pass filters 16R and 16L respectively extract acoustic signals in the middle band or higher on the acoustic frequency characteristic. These acoustic signals are respectively amplified by the amplifier 17.
It is supplied to the speakers 12R and 12L which constitute the above-mentioned vocalizing means 11R and 11L through R and 17L.

Further, microphones 18R and 18L for picking up external noise are provided near the speakers 12R and 12L constituting the above-mentioned vocalizing means 11R and 11L. External noise picked up by these microphones 18R and 18L is supplied to signal processing circuits 19R and 19L that form noise removal signals that cancel the external noise, respectively. The noise elimination signals formed by these 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.

Further, the signals from the switches 15R and 15L are supplied to the low pass filters (LPF) 22R and 22L. As a result, the low pass filters 22R and 22L
From each of them, a low-frequency acoustic signal on the acoustic frequency characteristic is extracted. These acoustic signals are respectively supplied to the amplifier 23 and added, and the added signals are added to the back support portion 2 described above.
Is supplied to the sound reproducing means 21 embedded in.

Therefore, in this device, the speaker 12
Noise removal signals that cancel the external noise are output from R and 12L, which are added to the acoustic signals. As a result, noise such as engine sound in the passenger cabin of the passenger plane is canceled at the seat, and a sound field in which external noise is removed can be created.

That is, in this device, the signal processing circuits 19R and 19L are provided for the microphones 18R and 18L.
Then, for example, signal processing as shown in FIG. 5 is performed. First, A in FIG. 5 is an example of a simple circuit, in which a signal from the microphone 18 is supplied to the filter 31 in the audio signal band. The signal from the filter 31 is the inverting circuit 32.
And the phase of the signal is inverted. This phase-inverted signal is taken out to the noise elimination signal output terminal 34 through the delay circuit 33.

As a result, the speakers 12R, 12L
Outputs a noise removal signal obtained by inverting the external noise picked up by the microphones 18R and 18L, and the noise removal signal cancels the external noise. In the delay circuit 33 described above, the timings of the external noise and the noise removal signals from the speakers 12R and 12L are equalized according to the distances between the speakers 12R and 12L and the microphones 18R and 18L and the delay time of each circuit. The delay time is adjusted.

Alternatively, as shown in FIG. 5B, the signal from the microphone 18 is supplied to the filter 41 in the audio signal band. The signal from the filter 41 is supplied to the transfer function calculation processing circuit 42, the signal from the calculation processing circuit 42 is supplied to the convolution operation processing circuit 43, and a noise elimination signal obtained by inverting external noise is formed. The formed noise elimination signal is taken out to the output terminal 44. This also cancels the external noise by this noise removal signal.

Thus, according to the above-mentioned device, the microphones 18R, 18 that pick up external noise near the voicing means.
L is provided, and using the signals from the microphones 18R and 18L, signals that cancel external noise to the signals supplied to the voicing means 11R and 11L (signal processing circuits 19R and 19L).
By superimposing L), external noise can be satisfactorily removed, and a sound field from which external noise is removed can be created in the seat.

Therefore, in this device, a sound field from which external noise is removed can be created in the seat, so that the volume of the acoustic signals output from the speakers 12R and 12L can be lowered, and sound leakage to the surroundings can be prevented. The generation can be further reduced. Also, the surrounding speakers 12R, 12
The sound leakage from L is also removed similarly to the external noise, and the problem of sound leakage can be solved as a whole.

Further, by turning off the above-mentioned switches 15R and 15L, it is possible to remove only external noise without outputting acoustic signals from the speakers 12R and 12L. As a result, noise such as engine sound of the seat can be reduced and a good sound field can be formed during sleep.

Further, in FIG. 4 described above, the switch 15
Signals from R and 15L are low-pass filters 22R and 22
Through L, the low frequency sound signals are added by the amplifier 23 and supplied to the sound reproducing means 21 embedded in the back support portion 2. As a result, it is possible to make the passengers feel the low-frequency sound signal, which is easily mixed with the low-frequency external noise, directly from the passenger's back, and realize the effect of the low-frequency sound signal.

Thus, according to the above-mentioned device, the vocalizing means (speakers 12R, 12L) are supplied with the acoustic signals in the middle band or higher in the acoustic frequency characteristic, and the acoustic signals in the low frequency band in the acoustic frequency characteristic are By supplying the sound to the sound reproducing means 21 embedded in the back support portion 2, it is possible to satisfactorily obtain the effect of the sound signal in the low frequency range particularly on the sound frequency characteristic.

The above-described audio device can be applied to any audiovisual system such as an audiovisual booth in a museum as well as a seat provided in a passenger room such as a passenger aircraft.

[0039]

According to the present invention, the voicing means is provided in the head support portion of the seat, and the directional characteristic of the voicing means is directed toward the front side of the center of the back support portion of the seat. It is now possible to receive good music, etc. without wearing headphones or the like.

Further, the directional characteristic of the voicing means is to reduce the occurrence of sound leakage by making the back support part of the seat not oriented toward the head support part of the front seat at the most tilted position. Is now possible.

Further, the voicing means is composed of a speaker and a reflector, and the directional characteristics of the speaker prevent the back support portion of the seat from being directed toward the head support portion of the rear seat at the most tilted position. By setting the directional characteristics of the reflector so that it does not face the head support of the front seat at the most tilted position of the back support of the seat, it is possible to obtain extremely sharp directional characteristics especially by combining the speaker and the reflector. Therefore, the above-described acoustic device can be realized extremely effectively.

Further, a microphone for picking up external noise is provided near the voicing means, and a signal from this microphone is used to superimpose a signal for canceling the external noise on the signal supplied to the voicing means. This makes it possible to effectively remove external noise and create a sound field free of external noise in the seat.

Further, the vocalizing means is supplied with an acoustic signal in the middle band or higher in the acoustic frequency characteristic, and the acoustic signal in the low frequency band in the acoustic frequency characteristic is supplied to the acoustic reproducing means embedded in the back support portion of the seat. By doing so, it has become possible to satisfactorily obtain the effect of the acoustic signal in the low frequency range particularly on the acoustic frequency characteristic.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an example of an audio device according to the present invention.

FIG. 2 is a configuration diagram of a specific example of the voicing means.

FIG. 3 is a diagram for explaining an audio device according to the present invention.

FIG. 4 is a configuration diagram of an example of a signal processing circuit of the audio device according to the present invention.

FIG. 5 is a configuration diagram of a specific circuit example thereof.

[Explanation of symbols]

 1 head support part (headrest) 2 back support part (backrest part) 10R, 10L wing part 11R, 11L voicing means 12 speaker 13 reflector 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 Seats 1A, 1B, 1C Head support 2A, 2B, 2C Back support a, b Directivity

Claims (5)

[Claims] 1. An acoustic device provided in a seat arranged at least in the front-rear, left-right direction, wherein a head support portion of the seat is provided with a vocalization means, and the directivity characteristic of the vocalization means is the center of the back support portion of the seat. An acoustic device characterized by being directed to the front side. 2. The acoustic device according to claim 1, wherein the directional characteristic of the voicing means is such that it does not face toward the front head support part of the seat at the most tilted position of the back support part of the seat. An acoustic device characterized by the above. 3. The acoustic device according to claim 1, wherein the voicing means comprises a speaker and a reflector, and the directional characteristic of the speaker is the head of the seat rearward when the back support portion of the seat is most tilted. It is characterized in that it is not oriented in the direction of the support portion, and that the directional characteristics of the reflector are not oriented in the direction of the head support portion of the seat in front at the most tilted position of the back support portion of the seat. And sound equipment. 4. The audio device according to claim 1, wherein a microphone for picking up external noise is provided in the vicinity of the voicing means, and a signal from the microphone is used to convert the external signal into the signal supplied to the voicing means. An acoustic device characterized in that a signal for canceling noise is superimposed. 5. The acoustic device according to claim 1, wherein the voicing means is supplied with an acoustic signal in a middle band or higher on the acoustic frequency characteristic, and the acoustic signal in the low frequency range on the acoustic frequency characteristic is of the seat. An acoustic device characterized in that it is adapted to be supplied to a sound reproducing means embedded in a back support part.