JP4873316B2 - Acoustic space sharing device - Google Patents

Description

  The present invention relates to an apparatus for synthesizing and reproducing a sound field by a plurality of speakers, reproducing a shared reality sound field, and sharing the acoustic space, and in particular, a conversation person in the reproduction sound field is also a speaker. The present invention relates to an apparatus for controlling an acoustic space.

  Of course, exchanging linguistic meaning is important when people communicate in a space. Furthermore, it is surprisingly important that you have spent the space together. In the case of the telephone, if the person stops speaking, the telephone is hung up. However, if the person is in the same space, the person can share the space even if the person stops speaking.

  If you are in the same space, communication does not exist if you are not speaking, but you can think of non-verbal and physical communication. In other words, not only exchanging meanings but also acquiring memories of spending the same space together is an essential function of the conversation that meets and talks. However, this function is currently lacking in the current communication technology.

  By the way, many methods have been proposed to generate a highly realistic sound field. Among them, a sound field reproduction method based on the principle of boundary sound field control (Boundary Surface Control: BSC) has been proposed.

  The principle of boundary sound field control (hereinafter abbreviated as BSC) is a method in which a sound source is installed at a point away from the boundary and a signal generated using an inverse system is output from the sound source.

  According to the principle of boundary sound field control, the sound pressure in an arbitrary region in the three-dimensional sound field can be controlled by controlling the sound pressure and the sound pressure gradient on the boundary surrounding the region. In order to perform precise control, it is necessary to discretize the boundary surface sufficiently shorter than the wavelength. Therefore, a compact immersive auditory display system capable of collecting and reproducing 64 channels for the purpose of reproducing the sound field around the head of a conversation person has been proposed (see Non-Patent Document 1).

  It is conceivable that a sound field reproduction room using the BSC principle described above is configured and a conversation person enters the room to share the sound field of the conversation person. For example, FIG. 11 shows a system for sharing a sound field with a talker using this BSC principle.

  As shown in FIG. 11, a BSC speaker 20 is provided in a sound field reproduction room 10 that constitutes an acoustic space. The BSC speaker 20 has a plurality of speakers arranged at predetermined positions in order to reproduce a sound field based on the principle of BSC. The conversation person 1 sits on the chair 15 provided at a predetermined position with respect to the BSC speaker 20 and listens to the sound from the BSC speaker 20. The BSC speaker 20 is driven by the BSC system control unit 11 based on the sound pressure signal acquired in the shared sound field 130 or the like.

  The principle of BSC is to drive the BSC speaker 20 so that the sound pressure signal on the surface S2 surrounding the conversation person 1 is the same as the sound pressure signal on the surface S1 of the shared sound field 130. That is, assuming that the conversation person 1 exists inside the surface S1 of the shared sound field 130, a BSC microphone (not shown) composed of a plurality of microphones is used to acquire the sound pressure signal of the surface S1. Are arranged along. On the other hand, the voice uttered by the talker 1 is collected by the microphone 16 and output from the speaker 32 installed in the shared sound field 130. Therefore, the BSC microphone acquires the voice from the conversation person 2 in the shared sound field 130, the sound in the shared sound field 130, and the sound of the conversation person 1 output from the speaker 32.

  Based on the sound pressure signal from the BSC microphone, the driving of the speaker 20 is controlled by the BSC system control unit 11, and the sound pressure signal on the surface S2 surrounding the conversation person 1 is the same as the sound pressure signal on the surface S1 of the shared sound field 130. To. As a result, in the space V2 surrounding the conversation person 1, the same sound field as that of the shared sound field space V1 is generated, and the conversation person 1 in the sound field reproduction room 10 has the common sound field 130 where the conversation person 2 exists. You can feel the acoustic effect of the same space.

  In the system configured as described above, the conversation person 1 in the sound field reproduction room 10 can feel the same space as the shared sound field 130 in which the conversation person 2 is present. However, on the contrary, the conversation person 2 cannot feel the space where the conversation person 1 exists.

It is conceivable to install a sound field reproduction system on the side of the conversation person 2, but both will feel the space inside the sound field reproduction room, and it is difficult to achieve the purpose of feeling the same space.
Journal of the Acoustical Society of Japan, Vol. 62, No. 1 (2006), pp. 32-41 “Prototype and Evaluation of Compact Immersive Auditory Display”

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a system in which a deeper memory of communication can be obtained when people spend time together while having a conversation, that is, a reality sound field communication system. To do.

An acoustic space sharing apparatus according to the present invention includes an acoustic space that reproduces a sound field by a plurality of speakers, a sound collection unit that acquires a voice of a talker provided in the acoustic space, and voice information from the sound collection unit. Shared sound field data creating means for creating spatial data information of the shared sound field based on shared sound field information, and driving of the speaker in the acoustic space based on the spatial data information from the shared sound field data creating means Control means, and the shared sound field data creation means is formed by a plurality of microphones installed so as to surround an arbitrary position space assuming that a talker of the shared sound field exists, and the plurality of microphones. Audio information obtained by the sound collecting means in a plurality of acoustic spaces, the number of the sound space having speakers arranged in the space and outputting the sound information obtained by the sound collecting means. There are output speakers, et al, the shared sound field data creation means creates the spatial data information sharing sound field corresponding to each acoustic space from the sound pressure signal obtained from the microphone, the acoustic space corresponding Based on the spatial data information from the shared sound field data creation means, the driving of the speaker is controlled to reproduce the shared sound field.

  Driving of the plurality of speakers provided in the acoustic space is controlled based on the boundary sound field control principle.

  Further, the shared sound field data creating means has storage means for storing spatial data based on a plurality of shared sound fields, and reads out the spatial data from the storage means to control the driving of the speaker in the acoustic space Can be configured to create a signal.

  Communication control means is provided in the acoustic space and shared sound field data creation means, and the acoustic space and shared sound field data creation means can be connected via a network.

  The plurality of speakers in the acoustic space may be arranged in a dome shape.

  The present invention is a system capable of generating another identical shared sound field that constitutes a shared space around each conversation person and communicating in the same acoustic space even when there are a plurality of talkers. Can be built.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of the acoustic space sharing apparatus of the present invention.

  As shown in FIG. 1, in the present invention, there are a plurality of talkers, and other identical shared sound fields constituting a shared space are generated around each talker. By generating a shared sound field, a system that can communicate in the same space is constructed.

  As shown in FIG. 1, spatial data in a shared sound field created from information obtained in the shared sound field creation room 30 is provided around the speakers 1 and 2. The talkers 1 and 2 enter the sound field reproduction room 10a (sound field reproduction room 1) and 10b (sound field reproduction room 2) similar to those described above. In this embodiment, the shared sound field is reproduced in the sound field reproduction chambers 10a and 10b and functions as an acoustic space.

  The sound field reproduction rooms 10a and 10b are provided with BSC system control units 11a and 11b for reproducing the sound field. The BSC system control units 11a and 11b are connected to a shared sound field data creation control unit (not shown) in the shared sound field creation room 30 in order to give spatial data in the shared sound field around the conversation persons 1 and 2. Has been. Although not shown, the BSC system control units 11a and 11b and the shared sound field data creation control unit in the shared sound field creation room 30 are connected using communication means such as a LAN or a broadband network. In FIG. 1, communication means and the like are omitted for easy understanding of the system of the present invention.

  In the sound field reproduction chambers 10a and 10b, BSC speakers 20a and 20b in which a plurality of speakers are arranged at predetermined positions are provided in order to perform sound field reproduction based on the BSC principle. Conversators 1 and 2 are seated on chairs 15a and 15b provided at predetermined positions with respect to the BSC speakers 20a and 20b, respectively, and listen to sounds from the speakers 20a and 20b.

  The speakers 20 a and 20 b are driven by the BSC system control units 11 a and 11 b based on the sound pressure signal acquired in the shared sound field creation room 30.

  In the shared sound field creation room 30, a BSC microphone 31 a for acquiring the sound pressure signal of the shared sound field of the conversation person 1 and a BSC microphone 31 b for acquiring the sound pressure signal of the shared sound field of the conversation person 2 are arranged. Has been. Assuming that the talkers 1 and 2 exist in the spaces V1 and V2 of the shared sound field reproduction room 31 assumed as a shared sound field, a BSC composed of a plurality of microphones is used to acquire sound pressure signals in the spaces V1 and V2. Microphones 31a and 31b are arranged.

  Voices uttered by the talkers 1 and 2 are collected by the microphones 16a and 16b in the sound field reproduction rooms 10a and 10b, and sent to the shared sound field creation room 30 through the communication means. And it outputs from the sound reproduction speakers 32a and 32b in the shared sound field creation room 30, respectively. The audio reproducing speakers 32a and 32b are installed in locations where the speakers 1 and 2 are assumed to exist, that is, in the spaces V1 and V2. Specifically, it is installed in the space of the BSC microphones 32a and 32b.

  In the shared sound field creation room 30, the voices of the speakers 1 and 2 and the sound in the shared sound field are collected by the BSC microphones 32a and 32b.

  In this way, the shared sound field data for the talker 1 is obtained by the BSC microphone 32a, and the shared sound field data for the talker 2 is obtained by the BSC microphone 32b. That is, the voices of the conversation persons 1 and 2 are collected by the microphones 16 a and 16 b in the sound field reproduction rooms 1 and 2 and reproduced by the sound reproduction speakers 32 a and 32 b in the shared sound field creation room 30. The sound reproduced in the shared sound field creation room 30 is picked up again by the BSC microphones 32a and 32b and reproduced in the BSC speakers 20a and 20b in the sound field reproduction rooms 1a and 1b of the conversation partner.

  The BSC microphones 31a and 31b are provided as shown in FIG. 2, for example. FIG. 2 is a schematic diagram showing an example of the BSC microphones 31a and 31b. In this embodiment, the BSC microphones 31a and 31b use a part of C80 fullerene as a shape for partitioning the space almost equally. A frame 31 made of C80 fullerene that can cover the entire head of the user (conversator) of the system is created. The C80 fullerene in this embodiment is composed of 70 nodes excluding 10 nodes for putting the head inside the frame from 80 nodes. The positions of the 70 nodes are constituted by combinations of hexagons and pentagons. 70 microphones were used, one at the position of 70 nodes. In this embodiment, as shown in FIG. 2, audio reproducing speakers 32a and 32b are installed inside the BSC microphones 31a and 31b.

  The BSC microphones 31a and 31b measure the sound pressure and particle velocity on the boundary surrounding the closed space at an arbitrary position in the shared sound field, and output a sound pressure signal based on the measurement result. Based on this sound pressure signal, the BSC system control units 11a and 11b are converted into an acoustic reverse system between the speakers of the BSC speakers 20a and 20b and the positions of the ears of the speakers 1 and 2 in the sound field reproduction rooms 10a and 10b. Based on the filtering process, sound is output from each of the BSC speakers 20a and 20b to reproduce the shared sound field.

  As described above, the principle of BSC is to drive the BSC speakers 20a and 20b so that the sound pressure signal on the surface surrounding the conversation person is the same as the sound pressure signal on the surface of the shared sound field.

The principle of this BSC is a theory that holds for sound waves that reach from the outside of the interface. As shown in FIG. 1, when the sound reproducing speakers 32a and 32b are installed inside the BSC macrophones 31a and 31b, signals inside the boundary surfaces, that is, the sounds L ₁₁ and L ₂₂ from the speakers 32a and 32b. It is necessary to cancel the direct sound part. Accordingly, the functions necessary for the BSC system control units 11a and 11b include a system for canceling the direct sound signal of the own voices L ₁₁ and L ₂₂ and the inverse system of the transfer functions M1 and M2 in the sound field reproduction rooms 10a and 10b. It will be a superposition of. Strictly speaking, it is necessary to suppress the reverberation (M′1, M′2) of one's own voice that occurs when it occurs in the sound field reproduction rooms 10a, 10b. However, since it is slightly smaller than the reproduction signal of the shared sound field, it can be ignored.

  The above-described BSC system control circuits 11a and 11b basically perform sound field reproduction based on the BSC principle. According to the principle of BSC, if the sound pressure and the sound pressure gradient on the closed surface surrounding an arbitrary area in the three-dimensional space can be controlled, the sound pressure at an arbitrary point inside the area can be controlled. Each conversation person can share a shared sound field. The principle of BSC will be briefly described.

  As shown in FIG. 3, the principle of BSC is a system that reproduces the sound field of the region V in the original sound field in the region V ′ in the reproduction sound field. However, the relative positions of the recording points (recording points) r and control points r ′ on the boundaries S and S ′ surrounding the regions V and V ′ and the points S and S ′ in the region are equal. From this, the following formula (1) is established.

  At this time, the sound pressures p (s) and p (s ′) in the region not including the sound source are represented by the following (2) by the Kirchoff-Helmholtz integral equation.

  Where ω is the angular frequency, ρ is the density of the medium, p (r) and ∂p (r / s) / ∂n are the sound pressure at the point r on the boundary and the sound pressure gradient in the normal n direction, respectively G ( r / s) is the Green function. Here, the following equation (3) is established from the relationship of the equation (2). Therefore, the following formula (4) is obtained.

  From equation (4), if the sound pressure and the sound pressure gradient on the boundary surface collected in the original sound field are controlled to be equal in the reproduced sound field, the sound field in the region V is reproduced in the region V ′. I understand that

  Here, at a point ri on the boundary of the sound pressure gradient (subscript i represents one of the minute elements of the discrete boundary S), the difference is determined by the difference in sound pressure measured by the microphones installed at two points sandwiching the boundary. I can do it. However, from the uniqueness of the solution in the boundary value problem, if the natural frequency is controlled, the sound pressure gradient can be controlled, and the sound pressure inside the boundary can also be controlled.

  In order to reproduce the signal recorded at the recording point of the original sound field at the control point of the reproduction sound field, the transfer characteristic and space between all the secondary sound sources (Secondary source) of the reproduction sound field and all the control points. Requires an inverse filter to cancel the stroke.

  An inverse filter matrix can be obtained from the relationship shown in FIG. When the input signal of the inverse system is x, the transfer function matrix is [G], and the output signal at the control point is x ′, the following equation holds for the inverse filter matrix.

x ′ = [G] [H] x
Here, the inverse filter matrix [H] can be written as follows.

[H] = [G] ⁻
However, [G] ⁻ is a general inverse matrix of [G]. [G], [H], x, and x ′ are as follows.

  Based on the principle of boundary sound field control (BSC) described above, the BSC system control units 11a and 11b control the BSC speakers 20a and 20b based on the data collected by the BSC microphones 31a and 31b.

  In order to reproduce the sound collected by the 70 microphones described above, it is desirable to use speakers that are equal to or more than the number of microphones. This is because, in the filter design calculation, if the number of speakers is more than the number of microphones, an approximate solution is not obtained, and filter characteristics can be obtained by matrix calculation. Of course, a speaker system can be configured by using less speakers than the number of microphones. In this case, an approximate solution is used for the filter operation.

  Next, a sound field reproduction room suitable for use as the above-described sound field reproduction rooms 10a and 10b will be described with reference to FIGS. Since the sound field reproduction chambers 10a and 10b are realized with the same configuration, the subscripts a and b are omitted from the reference numerals in FIGS.

  FIG. 5 is a perspective view showing a sound field reproduction room suitable for use in the present invention, FIG. 6 is a perspective view showing an arrangement state of the BSC speaker system except for a wall surface outside the sound field reproduction room, and FIG. It is the figure which looked at the speaker system in a sound field reproduction room from the lower part. In this embodiment, a sound field reproduction room is configured using 70 speakers for 70 microphones.

  As shown in FIG. 5, in this embodiment, a soundproof room 100 is used as a sound field reproduction room 10 in which a three-dimensional sound field reproduction device is installed in order to block external noise and the like. The soundproof room 100 enters the soundproof room 100 from the door 101 and closes the door 101 so that the soundproof room 100 is cut off from the outside.

  The sound field reproduction chamber 10 is subjected to sound absorption processing inside. A lift device 102 is provided at the center of the soundproof room 100, and a chair 15 on which a conversation person sits is attached on the lift device 102. The lift device 102 is raised to move the conversation person's head to the height of the sound field reproduction region. The chair 15 can be rotated, and the head can be rotated within the reproduction region.

  Although not shown, a screen for projecting video and a projector are installed inside, so that the video can be reproduced together with sound to experience virtual reality. In addition, a microphone for collecting the voice of the conversation person and a video camera for photographing the conversation person are provided.

  A plurality of speaker groups 210 to 214 are arranged as BSC speakers 20 at positive and negative positions on a three-dimensional axis centering on a conversation person, and a large number of speakers are arranged in a direction with a small discrimination limit of the conversation person.

  As shown in FIGS. 6 and 7, a speaker mounting member 202 is arranged so as to surround the conversation person, and the attachment member 2 above the conversation person is bent in an arch shape. The place where the conversation person's head is located is formed in a dome shape.

  That is, linear attachment members 202 are provided at the four corners below the conversation person's head, and speakers 215 as a part of two BSC speakers 20 are provided on each of the straight portions of the attachment members 202. Is attached. Accordingly, a total of eight speakers 215... Are attached below the conversation person's head. The eight speakers located below the conversation person's head are speakers that can sufficiently reproduce sounds, particularly middle and low sounds.

  In the portion located above the head, the second attachment member 203 is attached to the attachment member 202 bent in an arch shape with respect to the horizontal planes at different angles with respect to the median surface. Full range speakers 211 to 214 as a part of the plurality of BSC speakers 20 are attached to the second attachment member 203.

  A large number of speakers are arranged in the direction of small discrimination limit for human localization. For this reason, the maximum number of speakers are arranged in the vicinity of the horizontal plane where both ears of the talker are located.

  In the embodiment described above, 70 speakers are used, but the number of speakers is not limited to this. In addition, the speaker is arranged in a dome shape, but it is not limited to a dome shape, and may be a simple cylindrical or square columnar speaker arrangement. According to each speaker arrangement, the prediction / inverse system calculation is performed, and the filter characteristics are changed. You only have to set it.

  With reference to FIG.8 and FIG.9, it demonstrates further about the structure of the acoustic space sharing apparatus of this invention. FIG. 8 is a block diagram showing the configuration of the acoustic space sharing device of the present invention, and FIG. 9 is a block diagram showing an example of the configuration of the sound field reproducing device in the acoustic space sharing device of the present invention. In FIG. 9, for the sake of convenience, the speaker is described as being arranged in front of the conversation person 1 (2), but in reality, 70 speakers are arranged so as to surround the conversation person 1 (2). Has been.

FIG. 8 is a block diagram showing the overall configuration of the acoustic space sharing apparatus according to the present embodiment.
As shown in FIG. 8, the acoustic space sharing device includes a communication interface 40a (40b) connected to the network 50, a BSC control device 11a (11b), an amplifier 70a (70b), a BSC speaker 20a (20b), a microphone 16a ( 16b) and a shared sound field data creation control unit 300. The shared sound field data creation control unit 300 is provided in the shared sound field creation room 30.

  As shown in the drawing, each unit except the shared sound field data creation control unit 300 is individually provided in each sound field reproduction room. Although FIG. 8 shows two sound field reproduction rooms, two or more sound field reproduction apparatuses can be connected to the network 50.

  In addition, as described above, the shared sound field data creation control unit 300 creates a sound pressure signal for giving spatial data in the shared sound field around the conversations 1 and 2 and stores it in the corresponding sound field reproduction room. A control signal composed of sound pressure signal data and the like is transmitted via the network 50. For this reason, the shared sound field data creation control unit 300 is provided with a BSC macrophone, an audio speaker, and the like corresponding to each of the connected sound source reproduction rooms. A signal from the BSC microphone is sent to the network 50 via a communication interface (not shown).

  The sound field reproduction rooms 10a and 10b are provided with BSC system control units 11a and 11b for reproducing the sound field. The BSC system controllers 11a and 11b are connected to the shared sound field creation data controller 300 via the network 50 via the communication interfaces 40a and 40b, respectively.

  In the sound field reproduction chambers 10a and 10b, BSC speakers 20a and 20b in which a plurality of speakers are arranged at predetermined positions are provided in order to perform sound field reproduction based on the BSC principle. In the speakers 20a and 20b, the sound pressure signal created by the shared sound field creation data control unit 300 is given to the BSC system control units 11a and 11b via the network 50 and the communication interfaces 40a and 40b. Based on the sound pressure signal sent from the shared sound field creation data control unit 300, the BSC system control units 11a and 11b calculate filter coefficients and the like based on the above-described BSC principle, and amplifiers based on the calculation results 70a and 70b are driven, and the speakers 20a and 20b are driven.

  Next, the operation of each sound field reproduction room will be further described with reference to FIG.

  The sound pressure signal created by the shared sound field data creation control unit 300 is given to the communication interface 40a (40b), and the sound field data is given from the communication interface 40a (40b) to the BSC controller 11a (11b).

The sound field data given through the communication interface 40a (40b) is supplied to a plurality of digital filters 51 ₁ , 51 ₂ ... 51 _m . The transfer function of the digital filters 51 ₁ , 51 ₂ ... 51 _m is calculated and determined by the arithmetic processing unit 80 based on the BSC principle described above based on the signal given from the communication interface 40a (40b). .

The sound field data output from the digital filters 51 ₁ , 51 _2, ... 51 _m are converted into analog audio signals by the DA converters 61 ₁ , 61 _2, ... 61 _m , and the converted audio signals are respectively converted into audio amplifier circuits. 71 ₁ , 71 ₂ ... Are amplified by 71 _m and supplied to the speakers 211 to 214. The speakers 211 to 214 are configured in the speaker arrangement state described above.

Although not shown in the figure, the arithmetic processing unit 80 is configured as a computer unit including a CPU, a ROM, and a RAM, and sets filter coefficients of digital filters 51 ₁ , 51 ₂ ... 51 _m .

A storage device unit 85 is connected to the arithmetic processing unit 80. The storage device unit 85 stores the filter coefficients of the digital filters 51 ₁ , 51 _2, ... 51 _m obtained as calculation result data based on the BSC principle. Based on the signal given from the communication interface 40a (40b), the arithmetic unit 80 reads out the corresponding filter coefficient from the storage unit 85 and sets the filter coefficients of the digital filters 51 ₁ , 51 ₂ ... 51 _m. .

  By reproducing the sound field data in the shared space by the above-described method, a conversation person can share a common space even if they are separated.

  In the example shown in FIG. 8, there are two talkers, but when the number of talkers increases, the same set may be increased.

  In the acoustic space sharing apparatus described above, the shared sound field can be created in real time in the shared sound field creation room 30. However, there are cases where there is no need to reproduce the shared sound field in real time. The embodiment shown in FIG. 10 is a schematic diagram showing an acoustic space sharing device when there is no need to reproduce a shared sound field in real time.

As shown in FIG. 10, when there is no need to reproduce the shared sound field in real time, the sound of the shared sound field is collected in advance using a BSC microphone. Then, shared sound field data (N ₁ ) and (N ₂ ) are stored in the storage device of the shared sound field data creation control unit 300 in the shared sound field reproduction room from the collected data. Then, the shared sound field data (N ₁ ) and (N ₂ ) are read from the storage device and reproduced.

In addition, regarding the voices of the respective talkers 1 and 2, a signal obtained by convolving a transfer function (L ₁₂ , L ₂₁ ) from the playback speaker to the BSC microphone may be added. Further, a transfer function (L ′ ₁₁ , L ′ ₂₂ ) excluding the direct sound component may be added to the own audio signal.

In the figure, a BSC control system circuit is configured in the shared sound field data creation control unit 300, and the filter coefficient and sound field data related to the inverse system are sent to the sound field reproduction device to drive the BSC speaker. It is configured as follows. Shared sound field data (N ₁ ), (N ₂ ), transfer function from reproduction speaker to BSC microphone (L ₁₂ , L ₂₁ ), transfer function excluding direct sound component (L ′ ₁₁ , L ′ ₂₂ ) Is stored in advance in a storage device. The storage device stores various sound field data, and the sound field data creation control unit 300 reads out the sound field data desired by the speakers 1 and 2 and performs BSC control.

The control device 20 adds signals obtained by convolving each transfer function to the audio signals transmitted from the sound source reproduction devices 10a and 10b, and generates signals for the inverse system (M ₁ ⁻¹ and M ₂ ⁻¹ ). Generated and sent to each of the sound source reproduction apparatuses 10a and 10b. In each of the sound source reproduction devices 10a and 10b, the shared sound field can be obtained by driving the BSC speakers 20a and 20b with the transmitted filter coefficient and sound field data relating to the reverse system.

The merit of configuring such a system is that a database of various stored sound fields can be used as shared sound field data. That is, the data of the shared sound field (N ₁ ), (N ₂ ), and the transfer functions (L ₁₂ , L ₂₁ ) from the playback speaker to the BSC microphone are measured and stored in a number of places, so that the talker can You will be able to experience a sound field with various conditions. The transfer function (L ₁₂ , L ₂₁ ) may be replaced with data measured in an anechoic room or may be stopped by calculation.

  Furthermore, by capturing a conversation person with a video camera, sending the data to the other party, and superimposing the other party's video on the shared sound field, a more realistic conversation can be enjoyed.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

  The present invention can be applied to a video conference system with a sense of reality, a movie appreciation device full of realism, and the like.

It is a schematic diagram which shows the structure of the acoustic space sharing apparatus which concerns on embodiment of this invention. It is a typical perspective view which shows the structure of the BSC microphone used for this invention. It is a schematic diagram for demonstrating the principle of boundary sound field control. It is explanatory drawing which shows the relationship of an inverse filter matrix. It is a perspective view which shows a suitable sound field reproduction chamber used for this invention. It is a perspective view which shows the arrangement | positioning state of a BSC speaker system except the outer wall surface of the suitable sound field reproduction room used for this invention. It is the figure which looked at the speaker system in a sound field reproduction room suitable for use in the present invention from below. It is a block diagram which shows the structure of the acoustic space sharing apparatus of this invention. It is a block diagram which shows the structural example of the sound field reproducing | regenerating apparatus in the acoustic space sharing apparatus of this invention. It is a schematic diagram which shows the structure of the acoustic space sharing apparatus which concerns on different embodiment of this invention. It is a schematic diagram which shows the system which shares a space with a talker using a BSC principle.

Explanation of symbols

  1, 2, Conversator 10, 10a, 10b Sound field reproduction room, 11, 11a, 11b BSC system control unit, 16a, 16b Microphone, 20, 20a, 20b BSC speaker, 30 Shared sound field creation room, 31a, 31b BSC Microphone, 32a, 32b Audio speaker, 300 Shared sound field data creation control unit.

Claims (4)

Shared based on the acoustic space that reproduces the sound field by a plurality of speakers, the sound collecting means for acquiring the voice of the talker provided in the acoustic space, and the sound field information shared with the sound information from the sound collecting means Shared sound field data creating means for creating spatial data information of the sound field, and control means for controlling driving of a speaker in the acoustic space based on the spatial data information from the shared sound field data creating means , the sharing The sound field data creating means is arranged in a plurality of microphones installed so as to surround an arbitrary position space where it is assumed that a talker of the shared sound field exists, and in the space formed by the plurality of microphones. There are a number of speakers that output the sound information obtained by the sound means, and the sound information obtained by the sound collection means in a plurality of sound spaces is output from each speaker. , The shared sound field data creating means, from the shared sound field data creation unit operable to create spatial data information sharing sound field corresponding to each acoustic space from the sound pressure signal obtained from the microphone, the acoustic space corresponding An acoustic space sharing apparatus that reproduces a shared sound field by controlling driving of a speaker based on the spatial data information of the sound.   The acoustic space sharing apparatus according to claim 1, wherein driving of the plurality of speakers provided in the acoustic space is controlled based on a boundary sound field control principle. The acoustic space and provided with communication control means to a shared sound field data creating means, said claim 1 or claim 2 and the acoustic space and share sound field data creating means is characterized in that it is connected via a network The acoustic space sharing device according to claim 1.   The acoustic space sharing apparatus according to claim 1, wherein the plurality of speakers in the acoustic space are arranged in a dome shape.

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