JPH05333878A - Crosstalk sound controller - Google Patents

Abstract

PURPOSE:To obtain the crosstalk sound controller which can omit a microphone used for adaptive control and attenuates a crosstalk sound by small-sized hardware to make a desired sound easy to listen to. CONSTITUTION:This crosstalk sound controller consists of an adaptive filter 1a which performs adaptive control over the signal from a sound source 7a, a delay unit 2a which delays the signal from the sound source 7a, an adaptive filter 1b for adaptive control over the signal from a sound source 7b, a delay unit 2b which delays the signal from the sound source 7b, an adder 3a which adds the outputs of the adaptive filter 1b and delay unit 2a, an adder 3b which adds the outputs of the adaptive filter 1a and delay unit 2b, a speaker 4a which reproduces the output of the adder 3a, an acoustic lens 5a which gives directivity to its reproduced sound, a speaker 4b which reproduces the output of the adder 3b, and an acoustic lens 5b which gives directivity to its reproduced sound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crosstalk sound control device using active crosstalk sound control in a sound reproduction device for reproducing different sound sources from adjacent speakers.

[0002]

2. Description of the Related Art In recent years, as a part of passenger service on trains and airplanes, music such as headphones and a speaker embedded in a seat has been actively provided.

A conventional sound reproducing device will be described below with reference to the drawings. FIG. 4 is a block diagram of a conventional sound reproducing device. In the figure, 4a to 4f are seat-embedded speakers, 7a to 7c are sound sources, and 8a to 8c are seats.

The operation of the sound reproducing apparatus configured as described above will be described below. The stereo signal from the sound source 7a is reproduced by the speakers 4a and 4b. Similarly, stereo signals from the sound sources 7b and 7c are reproduced by the speakers 4c, 4d and 4e, 4f, respectively. Therefore, people A, B, and C can hear different sounds.

[0005]

However, in the above-mentioned conventional structure, the person A sitting on the seat 8a is
When person C plays a loud sound from each of speakers 4c to 4f, not only the reproduced sound of sound source 7a but also sound source 7
The reproduced sounds of b and 7c are also heard. Therefore, there is a problem that the desired sound cannot be heard well due to the disturbing sound next to it.

Further, if the speakers 4a to 4f are replaced with headphones, no disturbing sound can be heard, but there is a problem that a feeling of foreign matter is generated in the ears or the head and the user feels uncomfortable when listening for a long time.

In order to solve the above problems, the present invention attenuates crosstalk sounds from different sound sources that are close to each other by using an adaptive filter without using headphones so that only the desired sound can be heard. A control device is provided.

[0008]

In order to achieve this object, the crosstalk sound control device of the present invention is a sound reproduction device for reproducing different sound sources by a speaker built in a chair adjacent to the crosstalk sound control device. An angle detector for the backrest, a first adaptive filter for adaptively controlling the signal from the first sound source, a memory for storing the coefficient of the first adaptive filter, and a first adaptive filter for delaying the signal from the first sound source. 1 delay device, a second chair back angle detector, a second adaptive filter for adaptively controlling the signal from the second sound source, a memory for storing the coefficients of the first adaptive filter, and A second delayer for delaying the signal from the second sound source; a first adder for adding the output of the second adaptive filter and the output of the first delayer; The play second adder and an output of the first adder directivity control to adding the outputs of first the output of the adaptive filter of the second delay unit 1
And a second speaker that reproduces the output of the second adder by directivity control.

[0009]

With the above structure, by reproducing the output of the first adaptive filter from the second speaker, the crosstalk sound from the first speaker to the second chair is attenuated and the output of the second adaptive filter is also reduced. By reproducing the output from the first speaker, the crosstalk sound from the second speaker to the first chair is attenuated.

In general, a noise control device using an adaptive filter has a microphone for detecting an error and performing adaptive control. However, a change in the transfer function from a speaker to a sitting person causes a backrest of a chair. Focusing on the fact that it is determined by the angle, the first and second angle detectors read the coefficient of the adaptive filter that attenuates the crosstalk sound by detecting the angle from the memory in which it is written in advance. , This microphone can be omitted.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the crosstalk sound control device of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a crosstalk sound control apparatus according to an embodiment of the present invention. In the figure, 1a and 1b are adaptive filters, and 2a and 2b.
Is a delay device, 3a and 3b are adders, 4a and 4b are speakers, 5a and 5b are acoustic lenses, 6a and 6b are chair back angle detectors, 7a and 7b are sound sources, and 11a and 11b.
Is memory.

The operation of the crosstalk sound control device configured as described above will be described below. The signal from the sound source 7a is input to the adaptive filter 1a and the delay device 2a. Similarly, the signal from the sound source 7b is input to the adaptive filter 1b and the delay device 2b. The signals from the angle detectors 6a and 6b are input to the adaptive filters 1a and 1b. Next, the output signal of the adaptive filter 1a and the output signal of the delay device 2b are added to the adder 3
It is added at b. Similarly, the adaptive filter 1
The output signal of b and the output signal of the delay device 2a are added in the adder 3a. The outputs of the adders 3a and 3b are reproduced by the speakers 4a and 4b, respectively. Here, the adaptive filter 1a takes in the coefficient from the memory 11a so as to attenuate the crosstalk sound from the memory 11a based on the combination of the signals from the angle detectors 6a and 6b, and takes the crosstalk into account. Control is performed so that the crosstalk sound from the speaker 4a is attenuated. Since the speakers 4a and 4b are close to each other, mutual crosstalk sounds reach each other.
Since a and 4b are provided with the acoustic lenses 5a and 5b, the high frequency component has directivity, and the crosstalk sound has only the low frequency component. Similarly, the adaptive filter 1b
Controls the signal from the sound source 7b based on the combination of the signals from the angle detectors 6a and 6b from the memory 11b so as to reduce the crosstalk, whereby the crosstalk sound from the speaker 4b is attenuated. It

As described above, according to the present embodiment, the microphones are omitted by fetching the coefficients from the memories 11a and 11b based on the signals from the angle detectors 6a and 6b and controlling the signals of the sound sources 7a and 7b. Moreover, the hardware of the adaptive filters 1a and 1b can be miniaturized by preventing the crosstalk sound from including a high frequency component by the acoustic lenses 5a and 5b. Since only the low frequency components need to be controlled in this way, the size can be reduced and the crosstalk sound can be attenuated in a wide range to some extent.

In this embodiment, the speakers 4a, 4a
Although the acoustic lenses 5a and 5b are used for the directivity control of b, a horn may be used. Further, the delay devices 2a and 2b may be digital filters that correct the reproduced sounds of the speakers 4a and 4b. As a result, the acoustic characteristics can be improved, and the level of the band of the crosstalk sound that is particularly offensive to the ear can be lowered.

FIG. 2 is a block diagram of a crosstalk sound control device constructed by combining a plurality of the control devices shown in FIG. In FIG. 2, 1a to 1d are adaptive filters, 2a to 2f are delay devices, 3a to 3d are adders, 4a to 4f are speakers, 5a to 5f are acoustic lenses,
6a to 6c are angle detectors, 7a to 7c are sound sources, and 8a to 8
c is a seat, 11a to 11d are memories, and the speaker 4
a to 4f, acoustic lenses 5a to 5f, and angle detector 6a
6d are embedded in the seats 8a to 8c, respectively.

The operation of the crosstalk sound control device configured as described above will be described below.

Here, considering a case where a plurality of seats are positioned adjacent to each other such as a train or an airplane seat (FIG. 3), the crosstalk sound control for the person A will be described. Sound source 7
The stereo signals from a are input to the adaptive filters 1a and 1b and the delay devices 2a and 2b, respectively. Similarly, the Rch signal from the sound source 7b is transmitted to the adaptive filter 1
c and the delay device 2c, and the Lch signal from the sound source 7c is input to the adaptive filter 1d and the delay device 2d. Here, the angles of the backrests of the seats 8a to 8c are detected by the angle detectors 6a to 6c, and the detection signals are output to the adaptive filter 1a. The adaptive filter 1a reads the coefficient written in advance so as to attenuate the crosstalk sound from the memory 11a based on the combination of the detection signals of the angle detectors 6a to 6c. Similarly, the adaptive filter 1b is based on the combination of the detection signals of the angle detectors 6a to 6c from the memory 11b, and the adaptive filter 1c is based on the combination of the detection signals of the angle detectors 6a to 6c from the memory 11c and the adaptive filter 1d. Is a memory 11 based on a combination of detection signals of the angle detectors 6a to 6c.
Read the coefficient from d.

Next, the output signal of the adaptive filter 1c and the output signal of the delay device 2a are added in the adder 3a. Similarly, the output signal of the adaptive filter 1d and the output signal of the delay device 2b are added in the adder 3b. The outputs of the adders 3a-3b are reproduced by the speakers 4a-4b, respectively. Also speakers 4c-4d
Reproduces the signal from the sound source 7b, and the speakers 4e to 4f reproduce the signal from the sound source 7c. For the person A, the crosstalk sound from the speaker 4c and the speaker 4e
The crosstalk sound from the
Since 4f is provided with the acoustic lenses 5a to 5f, the high frequency component has directivity, and the crosstalk sound transmitted to the seat A has only the low frequency component. Since the adaptive filter 1d controls the crosstalk sound from the speaker 4e to the A seat by the coefficient read from the memory 11d, the crosstalk sound is reduced. Similarly, the adaptive filter 1c controls the signal from the sound source 7b by the coefficient read from the memory 11d, so that the crosstalk sound from the speaker 4c to the A seat is attenuated.

Although the person A has been described above, B, C
The same is true for the person. As described above, according to the present embodiment, the coefficient can be fetched from the memories 11a to 11d by the signals from the angle detectors 6a to 6c and the signals of the sound sources 7a to 7c can be controlled to omit the microphone. The hardware of the adaptive filters 1a to 1d can be downsized by preventing the crosstalk sound from including a high frequency component by the acoustic lenses 5a to 5f. Since only the low frequency components need to be adaptively controlled in this manner, the size can be reduced and the crosstalk sound can be attenuated in a wide range to some extent.

In this embodiment, the speakers 4a ...
Although the acoustic lenses 5a to 5f are used for controlling the directivity of 4f,
The same effect can be obtained by using a horn. Further, the delay devices 2a to 2f may be digital filters that correct the reproduced sounds of the speakers 4a to 4f. As a result, the acoustic characteristics can be improved, and the level of the band of the crosstalk sound that is particularly offensive to the ear can be lowered.

[0022]

As described above, the present invention has the first and second aspects.
By obtaining the coefficients of the adaptive filter from the respective memories by the combination of the output signals of the angle detectors of the backrests of the first and second chairs, the divergence of the adaptive control is unstable without using a microphone. The crosstalk sound from the first loudspeaker to the second chair and the crosstalk sound from the second loudspeaker to the first chair can be attenuated without considering the factors, and preferably the first By giving directivity to the reproduced sound from the second speaker with an acoustic lens, a horn, etc., the crosstalk sound has only low-frequency components, and the first and second adaptive filters need to control only low-frequency components. Only the configuration is sufficient, and the crosstalk sound control device can be downsized.

[Brief description of drawings]

FIG. 1 is a block diagram of a crosstalk sound control device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a crosstalk sound control device configured by combining a plurality of control devices shown in FIG.

FIG. 3 is an external perspective view of a chair in which a speaker and a microphone used in the present invention are embedded.

FIG. 4 is a block diagram of a conventional crosstalk sound control device.

[Explanation of symbols]

 1a, 1b, 1c, 1d adaptive filter 2a, 2b, 2c, 2d, 2e, 2f delay device 3a, 3b, 3c, 3d adder 4a, 4b, 4c, 4d, 4e, 4f speaker 5a, 5b, 5c, 5d , 5e, 5f Acoustic lens 6a, 6b, 6c Angle detector 7a, 7b, 7c Sound source 8a, 8b, 8c Seat 9a, 9b, 9c, 9d FIR filter 10a, 10b, 10c, 10d Subtractor 11a, 11b, 11c, 11d memory

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location H04S 7/00 Z 8421-5H (72) Inventor Hiroyuki Hashimoto 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Sangyo Co., Ltd.

Claims (6)

[Claims] 1. A sound reproducing device for reproducing a plurality of different sound sources by a speaker built in a chair which is adjacent to the sound reproducing device.
A first angle detector that detects the angle of the back of the first chair; a first adaptive filter that adaptively controls the signal from the first sound source; and a memory that stores the coefficient of the first adaptive filter. Similarly, a first delay device that delays the signal from the first sound source, a second angle detector that detects the angle of the backrest of the second chair, and an adaptive control of the signal from the second sound source. A second adaptive filter, a memory for storing coefficients of the second adaptive filter, a second delay device for delaying a signal from the second sound source, an output of the second adaptive filter and the first adaptive filter. A first adder for adding the output of the delay device, a second adder for adding the output of the first adaptive filter and the output of the second delay device, and an output of the first adder Sex control and re And a second speaker for reproducing the output of the second adder by directivity controlling the output of the second adder. The signal detected by the first angle detector and the second angle detector. The second adaptive filter is controlled by the combination of the signals detected in step 1) so as to read the contents of the memory storing the coefficient of the second adaptive filter and attenuate the crosstalk sound transmitted from the second speaker, The first adaptive filter is controlled by the combination of the signal detected by the first angle detector and the signal detected by the second angle detector so as to attenuate the crosstalk sound transmitted from the first speaker. A crosstalk sound control device characterized in that 2. A first speaker is attached to a first chair, a second speaker is attached to a second chair, and the first chair and the second chair are adjacent to each other and contact each other. The crosstalk sound control device according to claim 1, wherein: 3. The first chair has the first speaker seated on the second chair so that the high frequency component in the reproduced sound of the first speaker is not transmitted to the person sitting on the second chair. The angle at which the first speaker is attached is angled so as to avoid it from the person. Similarly, in the second chair, the high frequency component in the reproduced sound of the second speaker is transmitted to the person sitting in the first chair. 3. The crosstalk sound control device according to claim 2, wherein the angle at which the second speaker is attached is set so as to avoid the second speaker from a person sitting in the first chair so that the second speaker does not exist. .. 4. The first speaker uses an acoustic lens in front of the speaker so that a high frequency component in the reproduced sound is not transmitted to a person sitting on the second chair, and the second speaker also reproduces the reproduced sound. 2. The crosstalk sound control device according to claim 1, wherein an acoustic lens is used on the front surface of the speaker so that the high frequency component in 1 is not transmitted to the person sitting in the first chair. 5. The first speaker uses a horn in front of the speaker so that a high frequency component in the reproduced sound is not transmitted to a person sitting in a second chair, and the second speaker also includes a horn in the reproduced sound. 2. The crosstalk sound control device according to claim 1, wherein a horn is used in front of the speaker so that the high frequency component is not transmitted to the person sitting in the first chair. 6. The first delay device is a digital filter that corrects a reproduced sound reproduced from a first speaker,
The crosstalk sound control device according to claim 1, wherein the second delay device is a digital filter that corrects a reproduction sound reproduced from the second speaker.