JP5516781B2 - Sound emission and collection device - Google Patents

Description

  The present invention relates to a sound collection device that collects sound from around its own device and a sound emission and collection device including the sound collection device.

  Conventionally, various sound collecting devices have been devised for collecting ambient sounds and sounds with a predetermined sound collection directivity. In such a sound collecting device, not only one that collects sound with only one kind of sound collecting directivity but also one that can realize a plurality of sound collecting directivities as shown in Patent Document 1.

JP 2007-295104 A

  However, in the conventional sound collecting device, as shown in Patent Document 1, the sound collecting directivity is changed in response to an operation input from the user. For this reason, in the conventional sound collection device, the user has to perform an operation input while confirming the display unit, etc., and the operation is complicated and it is easy to confirm what kind of sound collection directivity it is. I can't.

  Therefore, an object of the present invention is to provide a sound collecting device that makes it easy for the user to identify the selected sound collecting directivity, and that the operation of switching the sound collecting directivity is intuitive and simple, and further, a configuration of such a sound collecting device. An object of the present invention is to realize a sound signal processing apparatus including sound emission control.

  The sound emission and collection device of the present invention has a plurality of abutting surfaces that abut on the installation surface, and is fixed to one surface of the housing and a housing whose installation state changes according to the selection of the abutting surface, A plurality of microphones each having a different sound collection direction; and a speaker installed on another surface orthogonal to the one surface, each of the plurality of microphones having a vibration surface, The support surface is fixed so that the vibration surface is orthogonal to the one surface and faces an inner region surrounded by each microphone.

  The plurality of microphones are unidirectional microphones having different directivity sensitivity directions.

  The sound collection direction of each microphone intersects with a microphone support frame that supports other microphones.

  In addition, the sound collection direction of one of the plurality of microphones matches the sound emission direction of the speaker.

  In the sound emission and collection device, the speaker includes a first speaker and a second speaker, an adder that synthesizes sound collection signals collected by the plurality of microphones, and the emission of the first speaker. A first echo canceler that generates a first pseudo echo signal based on the sound signal and subtracts the first pseudo echo signal from the collected sound signal synthesized by the adder, and a sound emission signal of the second speaker And a second echo canceler that generates a second pseudo echo signal based on the first echo canceler and subtracts the second pseudo echo signal from an output signal of the first echo canceller.

  According to this invention, the sound collection directivity switching operation is intuitive and simple, and a sound emission and collection device that can easily identify the selected sound collection directivity can be realized. Furthermore, it is possible to realize a sound collection / collection device that makes it possible to easily and easily identify the direction of sound emission as well as the switching of sound collection directivity.

It is a figure which shows the external appearance of the sound emission and collection apparatus which concerns on 1st Embodiment. It is a circuit block diagram of the sound emission and collection apparatus which concerns on 1st Embodiment. It is a figure explaining the usage condition of the sound emission and collection apparatus which concerns on 1st Embodiment. It is a circuit block diagram of the sound emission and collection apparatus which concerns on 2nd Embodiment.

  A sound signal processing apparatus according to a first embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a sound emission and collection device 1 that performs sound emission and collection will be described as an example of the sound signal processing device.

  FIG. 1A is an external perspective view of the sound emitting and collecting apparatus 1 according to the present embodiment, and FIG. 1B is a front view of the sound emitting and collecting apparatus 1. 1C is a top view of the sound emitting and collecting apparatus 1, and FIG. 1D is a side view of the sound emitting and collecting apparatus 1 viewed from the right side 2R side.

  The sound emission and collection device 1 includes a rectangular parallelepiped housing 2. As shown in FIG. 1, the housing 2 includes two speakers SP1, SP2 and three microphones MIC1, MIC2, MIC3. Further, the housing 2 includes a circuit module that realizes a circuit shown in FIG. 2 to be described later, although not shown in FIG.

  On the front surface 2F of the housing 2, two speakers SP1 and SP2 are arranged along the longitudinal direction. At this time, the speakers SP1 and SP2 are installed such that the direction orthogonal to the front surface 2F of the housing 2 is the central direction of sound emission.

  On the top surface 2U of the housing 2, a plurality of microphones MIC1, MIC2, and MIC3 having a single directivity are arranged. The microphones MIC1, MIC2, and MIC3 are arranged such that the vibration surface (sound receiving surface) is orthogonal to the top surface 2U. The microphones MIC1, MIC2, and MIC3 are arranged such that each vibration surface faces an inner region surrounded by the microphones MIC1, MIC2, and MIC3.

  The relative positions of these microphones MIC1, MIC2, and MIC3 are fixed by a microphone support frame 3 made of a rigid body such as resin. The microphone support frame 3 is fixed to the top surface 2U of the housing 2 by the microphone frame support member 4. Here, the microphone frame support member 4 includes a support column formed on the top surface 2U of the housing 2 and an elastic body connecting the support column and the microphone support frame 3, and the microphone support frame 3 is a top surface. It is fixed apart from 2U.

  Next, more specifically, the arrangement of the microphones MIC1, MIC2, and MIC3, the directivity of the microphones MIC1, MIC2, and MIC3 and the directivity of the speakers SP1 and SP2 will be described.

  The microphones MIC1, MIC2, and MIC3 are arranged such that the angles formed by the vibration surfaces are 120 °, and the vibration surfaces are as close as possible to each other. As a result, the direction (maximum sound collection sensitivity direction) Dm1 of the microphone MIC1, the maximum sound collection sensitivity direction Dm2 of the microphone MIC2, and the maximum sound collection sensitivity direction Dm3 of the microphone MIC3 are surrounded by the microphone. It is set to intersect at the center of the inner area. At this time, the microphones MIC1, MIC2, and MIC3 are set so that the maximum sound collection sensitivity direction Dm3 of the microphone MIC3 coincides with the sound emission center directions Dh1 and Dh2 of the speakers SP1 and SP2, that is, the direction orthogonal to the front surface 2F of the housing 2. Is installed.

  With such a configuration, the microphone MIC3 picks up sound with a single directivity in which the front 2F direction of the housing 2 is the maximum sound pickup sensitivity direction Dm3. The microphone MIC1 collects sound with a single directivity with the maximum sound collection sensitivity direction Dm1 being a direction that forms 120 ° counterclockwise when viewed from the top surface 2U with respect to the maximum sound collection sensitivity direction Dm3. That is, the microphone MIC1 collects sound with the maximum sensitivity in the left rear direction of the housing 2 on the left side 2L side of the housing 2 and the back surface 2B side. Furthermore, the microphone MIC2 collects sound with a single directivity with the maximum sound collection sensitivity direction Dm2 being the direction that forms 120 ° clockwise as viewed from the top surface 2U with respect to the maximum sound collection sensitivity direction Dm3. That is, the microphone MIC2 collects sound with the maximum sensitivity in the right rear direction of the housing 2 on the right side 2R side of the housing 2 and the back surface 2B side. By using the unidirectional microphones MIC1, MIC2, and MIC3 in which the positional relationship between the maximum sensitivity directions Dm1, Dm2, and Dm3 is set, sound can be collected in all directions of the sound emitting and collecting apparatus 1. .

  Next, the circuit configuration of the sound emitting and collecting apparatus 1 of the present embodiment will be described with reference to the drawings. FIG. 2 is a circuit block diagram of the sound emission and collection device 1 of the present embodiment.

  A circuit module is built in the housing 2 of the sound emission and collection device 1. The circuit module includes a control unit 10 and an attitude sensor 11 except for the microphones MIC1, MIC2, and MIC3 and speakers SP1 and SP2 shown in FIG. A memory 12, a sound collection control unit 13, a sound emission control unit 14, an I / F (interface unit) 15 and a circuit for connecting these functional units are formed.

  The attitude sensor 11 is composed of, for example, an acceleration sensor, generates attitude data corresponding to the direction of gravity, and provides the controller 10 with the attitude data.

  The control unit 10 performs overall control of the sound emitting and collecting apparatus 1 including communication processing with an external device via the I / F 15. Further, the control unit 10 sets the sound collection directivity control parameter and the sound emission directivity control parameter based on the posture data from the posture sensor 11. More specifically, the sound collection directivity control parameter and the sound emission directivity control parameter are stored in advance for each posture data in the memory 12, and the control unit 10 is based on the posture data acquired from the posture sensor 11. The sound collection directivity control parameter and the sound emission directivity control parameter stored in association with the memory 12 are read out. The control unit 10 gives the sound collection directivity control parameter to the sound collection control unit 13 and gives the sound emission directivity control parameter to the sound emission control unit 14.

  The sound collection control unit 13 includes a sound collection gain adjustment unit 131 and an adder 132, and the sound collection gain adjustment unit 131 includes amplifiers 1311, 1312, and 1313. The amplifier 1311 amplifies the sound collection signal Sc1 of the microphone MIC1 with the gain Gc1, the amplifier 1312 amplifies the sound collection signal Sc2 of the microphone MIC2 with the gain Gc2, and the amplifier 1313 gains the sound collection signal Sc3 of the microphone MIC3 with the gain Gc3. Amplify with. The adder 132 adds the amplified sound collection signals to generate a directivity control sound collection signal Ss. The generated directivity control sound collection signal is output to an external device via the I / F 15.

  At this time, the sound collection control unit 13 uses the sound collection directivity control parameter from the control unit 10 to adjust the gain Gc1 of the amplifier 1311 of the gain adjustment unit 131, the gain Gc2 of the amplifier 1312, and the gain Gc3 of the amplifier 1313. .

  By performing such configuration and control, sound collection control can be set for each posture of the housing 2.

  The sound emission control unit 14 includes a sound emission gain adjustment unit 141 and adders 1421 and 1422, and the sound emission gain adjustment unit 141 includes amplifiers 1411, 1412, 1413 and 1414. The amplifier 1411 amplifies the first sound emission signal Shu1 input via the I / F 15 with the gain Gh1, and outputs the amplified signal to the adder 1421. The amplifier 1412 amplifies the first sound emission signal Shu1 with a gain Gh2, and outputs the amplified signal to the adder 1422. The amplifier 1413 amplifies the second sound emission signal Shu2 input via the I / F 15 with the gain Gh3, and outputs the amplified signal to the adder 1421. The amplifier 1414 amplifies the second sound emission signal Shu2 with a gain Gh4 and outputs the amplified signal to the adder 1422.

  The adder 1421 adds the first sound emission signal Shu1 amplified by the gain Gh1 and the second sound emission signal Shu2 amplified by the gain Gh3 to generate the sound emission signal Sh1, and the speaker SP1. Give to. The adder 1422 adds the first sound emission signal Shu1 amplified by the gain Gh2 and the second sound emission signal Shu2 amplified by the gain Gh4 to generate the sound emission signal Sh2, and the speaker SP2 Give to.

  By performing such configuration and control, sound emission control can be set for each posture of the housing 2.

  Next, a specific usage example of the sound emitting and collecting apparatus 1 using the above-described configuration and control will be described with reference to FIG.

  FIG. 3 is a diagram illustrating a usage mode of the sound emission and collection device 1 of the present embodiment. FIG. 3A is an external perspective view in the first usage mode, and FIG. 3D is a diagram showing attitude data, sound collection directivity control parameters, and sound emission directivity control parameters in the first usage mode. is there. FIG. 3B is an external perspective view in the second usage mode, and FIG. 3E is a diagram showing posture data, sound collection directivity control parameters, and sound emission directivity control parameters in the second usage mode. is there. FIG. 3C is an external perspective view in the third usage mode, and FIG. 3F is a diagram showing posture data, sound collection directivity control parameters, and sound emission directivity control parameters in the third usage mode. is there. 3A and 3B, the thick arrow and the two-dot chain line circle representing the sound collection directivity are an image of the sound collection direction and the sound collection region, and FIG. FIG. 3B shows that the sound collection directivity having a predetermined sensitivity with respect to the entire peripheral direction of the housing 2 is shown. Show.

(First usage mode)
The user holds the housing 2 and installs the sound emitting and collecting apparatus 1 so that the bottom surface 2U of the housing 2 is in contact with the installation surface 100 as shown in FIG. In such a posture, the posture sensor 11 outputs posture data A1 with the direction from the center of the housing 2 to the bottom surface 2U as a direction related to gravity.

  When acquiring the posture data A1, the control unit 10 reads out the sound collection directivity control parameter and the sound emission directivity control parameter with respect to the posture data A1 as shown in FIG.

  Specifically, when acquiring the posture data A1, the control unit 10 reads out the gains Gc1 = 0, Gc2 = 0, and Gc3 = Gc as the sound collection directivity control parameters, and gives them to the sound collection control unit 13. The sound collection control unit 13 gives these sound collection directivity control parameters to the amplifiers 1311, 1312, and 1313 of the sound collection gain adjustment unit 131.

  Thereby, only the amplifier 1313 outputs the sound pickup signal amplified by the predetermined amplification factor Gc. As a result, the directivity control sound collection signal output from the sound collection control unit 13 is obtained by amplifying only the sound collection signal of the microphone MIC3 (Ss = Gc · Sc3). The first sound collection directivity Dc (A1) is set as the direction. Therefore, by installing the housing 2 in the first usage mode, sound can be collected only from the front 2F direction of the housing 2.

  When the control unit 10 acquires the attitude data A1, the gain Gh1 = (1/2) Gh, Gh2 = (1/2) Gh, Gh3 = (1/2) Gh, Gh4 = (1/2) Gh is read out and given to the sound emission control unit 14. The sound emission control unit 14 gives these sound emission directivity control parameters to the amplifiers 1411, 1412, 1413, and 1414 of the sound emission gain adjustment unit 141.

  Thus, the amplifiers 1411 and 1412 amplify and output the first sound emission signal Shu1 by (1/2) Gh, and the amplifiers 1413 and 1414 output the second sound emission signal Shu2 by (1/2). ) Amplify with Gh and output. The adder 1421 adds the first sound emission signal Shu1 amplified by the gain (1/2) Gh and the second sound emission signal Shu2 amplified by the gain (1/2) Gh, Output to speaker SP1. Similarly, the adder 1422 receives the first sound emission signal Shu1 amplified by the gain (1/2) Gh and the second sound emission signal Shu2 amplified by the gain (1/2) Gh. Add and output to speaker SP2. As a result, since the same sound emission signal is input to the speakers SP1 and SP2, the speakers SP1 and SP2 emit sound around the direction parallel to the installation surface 100 based on the same sound emission signal. For example, if the first sound emission signal Shu1 is a stereo R signal and the second sound emission signal is a stereo L signal, the monaural sound synthesized at the same ratio is the speakers SP1, SP2. Therefore, sound is emitted around a direction parallel to the installation surface 100.

(Second usage mode)
The user holds the housing 2 and installs the sound emitting and collecting apparatus 1 so that the back surface 2B of the housing 2 is in contact with the installation surface 100 as shown in FIG. In such a posture, the posture sensor 11 outputs posture data A2 with the direction from the center of the housing 2 to the back surface 2B as the direction related to gravity.

  When acquiring the posture data A2, the control unit 10 reads out the sound collection directivity control parameter and the sound emission directivity control parameter for the posture data A2 as shown in FIG.

  Specifically, when acquiring the attitude data A2, the control unit 10 uses the gain Gc1 = (2/3) Gc, Gc2 = (2/3) Gc, Gc3 = (2/3) as the sound collection directivity control parameters. ) Gc is read out and given to the sound collection control unit 13. The sound collection control unit 13 gives these sound collection directivity control parameters to the amplifiers 1311, 1312, and 1313 of the sound collection gain adjustment unit 131.

  As a result, all of the amplifiers 1311, 1312, and 1312 output sound pickup signals amplified by the same amplification factor (2/3) Gc. As a result, the directivity control sound collection signal output from the sound collection control unit 13 is obtained by amplifying and synthesizing the sound collection signals of the microphones MIC1, MIC2, and MIC3 (Ss = (2/3) Gc · Sc1 + (2/3) Gc · Sc2 + (2/3) Gc · Sc3) and has the second sound collection directivity Dc (A2) with the sound collection range in the entire peripheral direction with respect to the housing 2. . Therefore, by installing the housing 2 in the second usage mode, sound can be collected from all directions of the housing 2.

  Further, when the control unit 10 acquires the attitude data A2, the gain Gh1 = (1/2) Gh, Gh2 = (1/2) Gh, Gh3 = 1/2) Gh, Gh4 as the sound emission directivity control parameters. = (1/2) Gh is read out and given to the sound emission control unit 14. The sound emission control unit 14 gives these sound emission directivity control parameters to the amplifiers 1411, 1412, 1413, and 1414 of the sound emission gain adjustment unit 141.

  Thereby, since the same sound emission signal is input to the speakers SP1 and SP2, as in the first usage mode, the speakers SP1 and SP2 emit sound based on the same sound emission signal. At this time, since the front surface 2F of the housing 2 is upward facing the installation surface 100, sound is emitted from the speakers SP1 and SP2 around the direction orthogonal to the installation surface 100. For example, if the first sound emission signal Shu1 is a stereo R signal and the second sound emission signal is a stereo L signal, the monaural sound synthesized at the same ratio is the speakers SP1, SP2. The sound is emitted centering vertically upward.

(Third use mode)
The user holds the housing 2 and installs the sound emitting and collecting apparatus 1 so that the right side surface 2R of the housing 2 contacts the installation surface 100 as shown in FIG. In such a posture, the posture sensor 11 outputs posture data A3 with the direction from the center of the housing 2 to the right side surface 2R as the direction related to gravity.

  When acquiring the posture data A3, the control unit 10 reads the sound collection directivity control parameter and the sound emission directivity control parameter for the posture data A3 as shown in FIG.

  Specifically, when the posture data A3 is acquired, the control unit 10 reads out the gains Gc1 = 0, Gc2 = 0, and Gc3 = 0 as the sound collection directivity control parameters and supplies them to the sound collection control unit 13. The sound collection control unit 13 gives these sound collection directivity control parameters to the amplifiers 1311, 1312, and 1313 of the sound collection gain adjustment unit 131.

  As a result, all of the amplifiers 1311, 1312, and 1313 mute the collected sound signal (Ss = 0). As a result, the sound collection control unit 13 does not output a directivity control sound collection signal. Therefore, it is possible to prevent sound collection by installing the housing 2 in the third usage mode.

  Further, when acquiring the attitude data A3, the control unit 10 reads out the gains Gh1 = Gh, Gh2 = 0, Gh3 = 0, Gh4 = Gh as the sound emission directivity control parameters and supplies them to the sound emission control unit 14. The sound emission control unit 14 gives these sound emission directivity control parameters to the amplifiers 1411, 1412, 1413, and 1414 of the sound emission gain adjustment unit 141.

  Accordingly, the amplifier 1411 amplifies and outputs the first sound emission signal Shu1 with Gh, and the amplifier 1414 amplifies and outputs the second sound emission signal Shu2 with Gh. The amplifiers 1412 and 1413 mute the input sound emission signal. The adder 1421 outputs the first sound emission signal Shu1 amplified by the gain Gh to the speaker SP1. Similarly, the adder 1422 outputs the second sound emission signal Shu2 amplified by the gain Gh to the speaker SP2. As a result, a sound based on the first sound emission signal Shu1 is emitted from the speaker SP1 with a direction parallel to the installation surface 100 as the center. On the other hand, a sound based on the second sound emission signal Shu2 is emitted from the speaker SP2 around a direction parallel to the installation surface 100. For example, if the first sound emission signal Shu1 is a stereo R signal and the second sound emission signal Shu1 is a stereo L signal, the stereo R signal is emitted from the speaker SP1, and the stereo from the speaker SP2 is stereo. The L signal is emitted. That is, stereo reproduction by the two speakers SP1 and SP2 installed in parallel with the installation surface 100 becomes possible.

  As described above, by using the configuration and processing of the present embodiment, it is possible to easily change the sound collection directivity and sound output directivity by a simple method of changing the posture of the housing. Furthermore, since the appearance of the casing differs depending on the installed posture, it is possible to easily determine which sound collection directivity and sound emission directivity are selected by looking at the installation state of the casing.

  In the above description, an example in which three usage modes are set is shown. However, if at least two usage modes are set, the configuration and control of the present embodiment can be applied. For example, when the housing 2 is installed so that the left side surface 2L is in contact with the installation surface 100, the second sound emission signal Shu2 is emitted from the speaker SP1, and the first sound emission signal is emitted from the speaker SP2. A usage mode (Gh1 = Gh4 = 0, Gh2 = Gh3 = Gh) for emitting the signal Shu1 may be added.

  In the above description, an example of performing control for switching sound collection directivity and sound emission directivity according to the attitude of the housing 2 has been described. However, control for switching only sound collection directivity or only sound output directivity is performed. You may make it perform.

  Next, a sound emission and collection device according to the second embodiment will be described with reference to the drawings.

  FIG. 4 is a circuit block diagram of the sound emission and collection device 1 ′ of this embodiment.

  The sound emission and collection device 1 ′ of this embodiment is obtained by adding an echo canceller 16 to the sound emission and collection device 1 shown in the first embodiment. Therefore, descriptions other than those related to the echo canceller 16 are omitted.

  The echo canceller 16 includes adaptive filters 1611 and 1612 and post processors 1621 and 1622.

  When acquiring new posture data, the control unit 10 gives the echo canceller 16 an initial condition for estimating a pseudo echo signal based on the posture data. That is, the echo canceller 16 is given an initial condition based on the sound collection directivity and sound emission directivity set by the attitude data.

  The adaptive filter 1611 receives the sound emission signal given to the speaker SP1, estimates the first pseudo echo signal, and outputs it to the post processor 1621. The post processor 1621 subtracts the first pseudo echo signal from the directivity control sound collection signal Ss from the sound collection control unit 13 and outputs the result.

  The adaptive filter 1612 receives the sound emission signal given to the speaker SP2, estimates the second pseudo echo signal, and outputs it to the post processor 1622. The post processor 1622 subtracts the second pseudo echo signal from the signal obtained by subtracting the second pseudo echo signal from the directivity control sound collection signal Ss and outputs the result.

  By performing such a configuration and processing, even if the posture of the housing is changed, a pseudo echo signal is estimated according to the posture, and echo cancellation processing is performed. Thereby, it is not necessary for the user to set an initial value of echo cancellation every time the casing is replaced, and a directivity-controlled sound pickup signal in which the sneak component of the sound emission signal is suppressed can be obtained.

DESCRIPTION OF SYMBOLS 1- Sound emitting and collecting apparatus, 2 housing | casing, 2F- front surface of the housing | casing 2, 2B- back surface of the housing | casing 2, 2U- top surface of the housing | casing 2, 2D- bottom surface of the housing | casing 2, 2L- housing | casing 2 Left side, 2R-right side of housing 2, 3-microphone support frame, 4-microphone frame support member, SP1, SP2-speaker, MIC1, MIC2, MIC3-microphone,
10-control unit, 11-attitude sensor, 12-memory, 13-sound collection control unit, 131-sound collection gain adjustment unit, 132-adder, 14-sound emission control unit, 141-sound emission gain adjustment unit, 1421 , 1422-adder, 15-I / F, 16-echo canceller, 1611, 1612-adaptive filter, 1621, 1622-post processor

Claims (5)

A housing that has a plurality of contact surfaces that contact the installation surface, the installation state of which varies depending on selection of the contact surface;
A plurality of microphones fixed to one surface of the housing and having different sound collection directions;
A speaker installed on another surface orthogonal to the one surface,
Each of the plurality of microphones has a vibration surface;
By the support frame that supports the adjacent microphone,
The sound emission and collection device is fixed so that the vibration surface is orthogonal to the one surface and faces an inner region surrounded by each microphone. The plurality of microphones are unidirectional microphones having different directivity sensitivity directions.
The sound emission and collection device according to claim 1. The sound emission and collection device according to claim 1 or 2, wherein a sound collection direction of each microphone intersects with a microphone support frame that supports another microphone. The sound emission and collection device according to claim 1, wherein a sound collection direction of one of the plurality of microphones is coincident with a sound emission direction of the speaker. The speaker comprises a first speaker and a second speaker,
An adder for synthesizing the collected sound signals collected by the plurality of microphones;
Generating a first pseudo echo signal based on the sound emission signal of the first speaker;
A first echo canceler for subtracting the first pseudo echo signal from the collected sound signal synthesized by the adder;
Generating a second pseudo echo signal based on the sound output signal of the second speaker;
A second echo canceller that subtracts the second pseudo echo signal from the output signal of the first echo canceller,
The sound emission and collection device according to any one of claims 1 to 4.

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