JP2010091777A - Soundproof system and soundproof control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology which attains a hands free communication system with high secrecy by using a simple partition, in an environment such as a call center or an office. <P>SOLUTION: A terminal device 4 with a flat speaker and a directional sound collector 5 are installed in each space which is separated by a partition 3 composed of a sound absorbing panel 1 and a soundproof wall 2. A user S of this system performs voice communication by using the terminal device 4 with the flat speaker and the directional sound collector 5 in each space separated by the partition 3. The terminal device 4 with the flat speaker includes a flat speaker SP for outputting sound in an arrow direction A in the figure. The sound absorbing panel 1 is provided at a position separated from a sound output direction of the flat speaker SP, and absorbs output sound from the flat speaker. The soundproof wall 2 is provided at a position surrounding space between the flat speaker SP and the sound absorbing panel 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a soundproofing system and a soundproofing control system.

Various techniques have been proposed to enhance the confidentiality of the content of calls when calling at a call center or office. For example, Patent Document 1 proposes an active soundproof hood device that obtains sufficient soundproofing performance for telephone calls with a simple soundproof hood and that does not leak the call to the outside. The active soundproof hood apparatus described in Patent Document 1 is provided with a soundproof hood at a place where a telephone is installed, and a control speaker is mounted downward and a masking speaker is mounted upward on the upper part. In addition, a noise detector is attached to the top surface of the soundproof hood, and error detectors are attached to the left and right sides of the hollowed portion. When the external noise is large, this noise is detected by a noise detector and given to the ANC control unit. The ANC control unit generates a mute control signal substantially in phase with the noise and supplies it to the control speaker. In this way, the caller does not hear external noise, and can hear highly clear voice from the telephone. When the surroundings are quiet, the masking sound is emitted from the masking speaker to the outside, and the confidentiality of the conversation of the caller is increased.
Japanese Patent Application Laid-Open No. 08-296335

However, the technique described in Patent Document 1 has a problem that the surroundings become noisy because a masking sound is output to the outside.
The present invention has been made in view of the above-described background, and provides a technique capable of realizing a highly secure hands-free call system using a simple partition in an environment such as a call center or an office. Objective.

  In order to solve the above-described problems, the present invention provides a flat speaker that emits sound in a predetermined direction and a position separated from the sound emission direction of the flat speaker, and emits sound from the flat speaker. There is provided a soundproofing system comprising: a sound absorbing panel that absorbs sound; and a sound collecting means having directivity with respect to a speaking position of a speaker located in a space between the flat speaker and the sound absorbing panel. .

  In a preferred aspect of the present invention, there may be further provided a second sound absorbing panel provided at a position opposite to the sound emitting direction of the flat speaker with respect to the installation position of the flat speaker and surrounding the space.

Further, in a further preferred aspect of the present invention, one or a plurality of sound barriers provided at a position surrounding a space between the planar speaker and the sound absorbing panel may be provided.
Further, in a further preferred aspect of the present invention, there may be provided crosstalk detection means for detecting crosstalk from the space to the outside, and noise cancellation means for performing noise cancellation processing based on a detection result of the crosstalk detection means. .

  Further, the present invention provides the second sound absorbing panel of another soundproofing system in which a plurality of the above soundproofing systems are arranged in a row, and the sound absorbing panel of each soundproofing system is disposed in the sound emitting direction of the soundproofing system. A soundproof control system is also provided.

  According to the present invention, a highly secure hands-free call system can be realized using a simple partition in an environment such as a call center or an office.

<Configuration>
1 and 2 are diagrams showing an example of the configuration of a system according to an embodiment of the present invention. This system is a hands-free call system used in an environment such as a call center or office. As shown in the figure, this system includes a plurality of sound absorbing panels 1a, 1b, 1c and a plurality of soundproof walls 2a, 2b,. In the following description, when it is not necessary to distinguish the sound absorbing panels 1a, 1b, and 1c, they will be referred to as “sound absorbing panels 1”. Similarly, when it is not necessary to distinguish the soundproof walls 2a, 2b,..., 2f, these will be referred to as “soundproof walls 2”. In the example shown in FIG. 1, three sound absorbing panels and six soundproof walls 2 are illustrated, but the number of sound absorbing panels 1 and soundproof walls 2 is not limited to this, and may be larger or smaller. .

  As shown in FIG. 1, a space in the x-axis direction in the drawing is partitioned by the sound absorbing panel 1, and a space in the y-axis direction in the drawing is partitioned by the soundproof wall 2. In the following description, for convenience of explanation, each space surrounded by the sound absorbing panel 1 and the soundproof wall 2 will be referred to as a “booth”. In the example shown in FIG. 1, a plurality of booths B1, B2, B3, and B4 are formed by a plurality of sound absorbing panels 1 and a plurality of soundproof walls 2. In the following description, when it is not necessary to distinguish booths B1, B2, B3, and B4 from each other for convenience of explanation, these will be referred to as “booth B”.

  Each of the plurality of booths B is provided with a chair 10 and a desk 11, and a terminal 4 with a flat speaker and a directional sound collector 5 are attached to the desk 11. The system user S sits on a chair 10 installed in the booth B, and performs a voice call using the terminal 4 with a flat speaker and the directional sound collector 5 installed on the desk 11.

  The terminal 4 with a flat speaker is a communication terminal having a function for performing a voice call. The flat speaker-equipped terminal 4 includes a flat speaker SP that emits sound in the direction of arrow A in the figure. The voices of the callers of the users S, S,... Are emitted from the flat speaker SP. The directional sound collector 5 is sound collection means having directivity with respect to the utterance position of the utterer (user) S located in each booth B. The directional sound collector 5 is a directional sound collector such as a directional microphone or a microphone array. The voice of the speaker S is picked up by the directional sound pickup device 5. In this system, by using a directional sound pickup device, even when the distance from the sound pickup device to the speaker S is large, or even when the speaker S speaks in a small voice, the voice of the speaker S Can be collected more suitably. In addition, since it is possible to talk even at a low volume, the diffracted sound to the adjacent booth B can be reduced. The sound collected by the directional sound collector 5 is converted into an audio signal and supplied to the terminal 4 with a flat speaker. The flat speaker-equipped terminal 4 transmits the sound signal supplied from the directional sound collector 5 to the call partner terminal, and supplies the sound signal received from the call partner terminal to the flat speaker SP to emit sound. . Thereby, a voice call is realized.

  The sound absorbing panel 1 is provided at a position separated from the sound emission direction of the flat speaker SP, and absorbs sound emitted from the flat speaker SP. In this system, since the sound wave output from the flat speaker SP is a plane wave, it is radiated with strong directivity and is absorbed by the sound absorbing panel 1 of the partition 3 without producing diffracted sound. The sound absorbing panel 1 has a height and a thickness so as to sufficiently absorb a plane wave arriving from the plane speaker SP.

  As shown in FIG. 1, the soundproof wall 2 is provided at a position surrounding a space between the flat speaker SP and the sound absorbing panel 1. The soundproof wall 2 prevents the sound emitted from the speaker S of each booth B and the sound emitted from the flat speaker SP from being diffracted into another adjacent booth B.

  In the example shown in FIG. 1, as described above, the sound absorbing panel 1 divides the space in the x-axis direction in the figure, and the soundproof wall 2 divides the space in the y-axis direction in the figure. A plurality of spaces (booth B) partitioned by the wall 2 are formed in a planar shape. A sound absorbing panel 1 is installed at the position of each booth B in the direction of arrow A (the position in the sound emission direction of the flat speaker SP with respect to the installation position of the flat speaker SP). Further, the sound absorbing panel is also provided at a position opposite to the arrow A direction of each booth B (hereinafter referred to as “front direction”) (position opposite to the sound emission direction of the flat speaker SP with respect to the installation position of the flat speaker SP). 1 is installed. Specifically, in FIG. 1, a sound absorbing panel 1b is installed at a position in the arrow A direction of the booth B1, and a sound absorbing panel 1a is installed at a position in the front direction of the booth B1. Similarly, a sound absorbing panel 1c is provided in the arrow A direction of the booth B3, and a sound absorbing panel 1b is provided in the front direction of the booth B3. At this time, as shown in FIG. 1, the sound absorbing panel 1b that absorbs the sound emitted from the flat speaker SP installed in the booth B1 is provided at a position in the front direction of the booth B3, and the front direction portion of the booth B3 is arranged. Doubles as a sound absorbing panel. The sound absorption panel 1 installed in the front direction of each booth B absorbs sound coming from the front direction of each booth B.

  Next, the crosstalk detector 6 shown in FIG. 2 is crosstalk detection means for detecting crosstalk from each booth B to the outside. As shown in FIG. 2, the crosstalk detector 6 is provided on the top of the soundproof wall 2. The ANC control unit 9 is a noise canceling unit that performs a noise canceling process based on the detection result of the crosstalk detector 6. More specifically, the ANC control unit 9 generates a muffled signal substantially in phase with the signal detected by the crosstalk detector 6, and supplies the generated muffled signal to the control speaker 8. The control speaker 8 emits sound according to the signal supplied from the ANC control unit 9. The sound leaking from each booth B is canceled out by the sound wave emitted from the control speaker 8, and crosstalk is prevented. The error detector 7 is a detector that detects an unerased sound between the crosstalk sound detected by the crosstalk detector 6 and the control sound emitted from the control speaker 8. The error detector 7 is provided on the top of the soundproof wall 2. The ANC control unit 9 is a circuit that generates a mute control signal to the control speaker 8 based on the error signal output from the error detector 7 so that the error signal becomes zero. The mute control signal here is generated by using a digital signal processing circuit composed of a delayer such as an FIR filter, a multiplier, an adder, and the like. The crosstalk detector 6, the error detector 7, the control speaker 8, and the ANC control unit 9 may be built in the soundproof wall 2 or may be configured to be externally attached to the soundproof wall 2. Here, the ANC control unit is used as the noise canceling means. However, the means for preventing crosstalk is not limited to ANC control, and any means may be used as long as it prevents crosstalk to the outside.

  In the system shown in FIGS. 1 and 2, when the user S makes a voice call in each booth B, the voice of the user S is picked up by the directional sound pickup device 5 and the voice of the other party is flat. Sound is emitted from the speaker SP. At this time, since the sound wave output from the flat speaker SP is a plane wave, it is radiated with strong directivity and is absorbed by the rear sound absorbing panel 1 without producing diffracted sound. In addition, the speech of the speaker S is prevented from being diffracted by the sound barrier 2 into another booth. Further, the sound leaking from the upper part of each booth to the outside is canceled by the mute control signal output from the control speaker 8, and crosstalk to the outside is prevented.

  Thus, in this embodiment, the use of the flat speaker SP and the sound absorbing panel 1 in the call system prevents the call sound from leaking to the surroundings. In addition, in order to prevent the voice of the caller from leaking to the surroundings, a partition in which the ANC device is built in the soundproof wall is used. Thus, according to this embodiment, since the sound absorbing panel 1 and the soundproof wall 2 with the ANC device are used, it is possible to prevent sound from leaking to the surroundings.

Further, in the present embodiment, by using the directional sound collector 5, it is possible to sufficiently collect sound even when the caller is speaking with a small voice, and the diffracted sound to the adjacent booth B is generated. Can be reduced. In addition, by installing the crosstalk detector 6 and the control speaker 8 on the top of the sound barrier 2 and performing ANC control, a hands-free call that does not leak a call to the surroundings can be provided at the same time.
Moreover, according to this embodiment, since the speaker output is a plane wave, a wide range can be controlled. Moreover, according to this embodiment, since it is hands free, a comfortable call can be provided.

<Modification>
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. An example is shown below. In addition, you may combine each following aspect suitably.
(1) In the above-described embodiment, as illustrated in FIG. 1, the case where the four booths B are provided in a planar shape by the three sound absorbing panels 1 and the six soundproof walls 2 has been described. The number and arrangement of the soundproof walls 2 are not limited to this. For example, the sound absorbing panel 1 and the soundproof wall 2 may be arranged such that a plurality of booths B are formed in a row by the sound absorbing panel 1 and the soundproof wall 2. Further, the number of booths B is not limited to a plurality, and one booth B may be configured.

(2) In the above-described embodiment, the booth B is formed by the partition 3 composed of the sound absorbing panel 1 and the soundproof wall 2. However, the soundproof wall 2 is not used, and only the sound absorbing panel 1 is used. A booth may be formed. For example, when one booth B is formed without forming a plurality of booths B, a sound absorbing panel may be provided at a position separated from the sound emission direction of the flat speaker and the soundproof wall 2 may not be installed. . Also in this case, since the output of the flat speaker is a plane wave, it is radiated with strong directivity, so that it is absorbed by the rear sound absorbing panel 1 without producing diffracted sound.

(3) In the above-described embodiment, the sound absorbing panel 1 is also provided at a position in the front direction of the booth B (the direction opposite to the sound emission direction of the flat speaker with respect to the installation position of the flat speaker SP). It is good also as a structure which provides a sound absorption panel only in back (sound emission direction of a flat speaker), without providing the sound absorption panel 1 in a direction. Also in this case, since the output of the flat speaker is a plane wave, the sound is emitted with a strong directivity, so that the sound is absorbed by the rear sound absorbing panel 1 without producing a diffracted sound.

It is a figure which shows an example of a structure of a system. It is a figure which shows an example of a structure of a system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sound absorption panel, 2 ... Soundproof wall, 3 ... Partition, 4 ... Terminal unit with a plane speaker, 5 ... Directional sound collector, 6 ... Crosstalk detector, 7 ... Error detector, 8 ... Control speaker, 9 ... ANC Control part, 10 ... chair, 11 ... desk, B ... booth, SP ... flat speaker.

Claims (5)

A flat speaker that emits sound in a predetermined direction;
A sound-absorbing panel that is provided at a position spaced from the sound emission direction of the planar speaker and absorbs sound emitted from the planar speaker;
A soundproofing system comprising: sound collection means having directivity with respect to an utterance position of a speaker located in a space between the planar speaker and the sound absorbing panel. 2. The soundproofing according to claim 1, further comprising a second sound absorbing panel provided at a position opposite to a sound emitting direction of the flat speaker with respect to an installation position of the flat speaker and surrounding the space. system. The soundproofing system according to claim 1 or 2, further comprising one or a plurality of soundproofing walls provided at a position surrounding a space between the planar speaker and the sound absorbing panel. Crosstalk detection means for detecting crosstalk from the space to the outside;
The soundproofing system according to claim 3, further comprising: a noise canceling unit that performs a noise canceling process based on a detection result of the crosstalk detecting unit. A plurality of soundproofing systems according to claim 2 are arranged in a row, and the sound absorbing panel of each soundproofing system also serves as the second sound absorbing panel of another soundproofing system disposed in the sound emitting direction of the soundproofing system. A soundproof control system characterized by that.

Images