Sound collection/reproduction method and device
First Claim
Patent Images
1. A sound collection and reproduction device comprising:
- a plurality of sound collection devices arranged in proximity to one another;
a digital signal processing unit which processes sounds collected by each of the sound collection devices; and
a reproduction output unit which outputs a speech signal which is output by the digital signal processing unit, whereinthe reproduction output unit is provided with reproduction devices of one or a plurality of channels,the digital signal processing unit is provided with control filters in a number corresponding to the number of reproduction channels connected to each of the plurality of sound collection devices, and adders in a number corresponding to the number of channels, which add the outputs of the control filters of each of the reproduction channels connected to each of the sound collection devices for each channel, the outputs of the adder of each of the channels being connected to the reproduction device of each of the channels of the reproduction output unit,the control filters are obtained by setting a plurality of control points in a sound field around the plurality of sound collection devices arranged in proximity to one another, determining a desired response function matrix and a transfer function matrix between the control points and each of the sound collection devices on the basis of measurement values, and, in cases where the directivity of the sound collection devices is designated, determining values of the control filters on the basis of the desired response function matrix and transfer function matrix between the control points corresponding to the designated directivity and each of the sound collection devices, andthe digital signal processing unit is provided with a directivity control unit to which directivity control data are input in order to determine the directivity during sound collection by controlling the control filters wherein each of the control filters is represented by H (ω
)=[C(ω
)T·
C(ω
)]−
1C(ω
)T·
A(ω
), where the control filter matrix is H (ω
), the desired response function matrix is A (ω
), and the transfer function is C (ω
), and is obtained by solving the inverse matrix [C (ω
)T·
C (ω
)]−
1C(ω
)T of the transfer function matrix C (ω
).
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Abstract
To provide a sound collection system using a plurality of microphones arranged in the proximity to one another and having an excellent directivity for an arbitrary position in the sound field space. A plurality of control points are set around a plurality of sound collecting microphones. A desired response function matrix A (ω) and a transfer function matrix C (ω) between the control points and the respective microphones are measured. A control filter H arranged in a digital signal processing unit (2) is connected to each of the microphones constituting the sound collection device (1). The control filters H are arranged for the number of output channels of a reproduction unit (4). An output of each of the control filters H is added for each channel and outputted to each channel of the reproduction unit (4). By specifying a microphone directivity upon sound collection at a control point, the control filters H are decided according to the measured desired response function matrix A (ω) and the transfer function matrix C (ω) of the specified control point.
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Citations
6 Claims
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1. A sound collection and reproduction device comprising:
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a plurality of sound collection devices arranged in proximity to one another; a digital signal processing unit which processes sounds collected by each of the sound collection devices; and a reproduction output unit which outputs a speech signal which is output by the digital signal processing unit, wherein the reproduction output unit is provided with reproduction devices of one or a plurality of channels, the digital signal processing unit is provided with control filters in a number corresponding to the number of reproduction channels connected to each of the plurality of sound collection devices, and adders in a number corresponding to the number of channels, which add the outputs of the control filters of each of the reproduction channels connected to each of the sound collection devices for each channel, the outputs of the adder of each of the channels being connected to the reproduction device of each of the channels of the reproduction output unit, the control filters are obtained by setting a plurality of control points in a sound field around the plurality of sound collection devices arranged in proximity to one another, determining a desired response function matrix and a transfer function matrix between the control points and each of the sound collection devices on the basis of measurement values, and, in cases where the directivity of the sound collection devices is designated, determining values of the control filters on the basis of the desired response function matrix and transfer function matrix between the control points corresponding to the designated directivity and each of the sound collection devices, and the digital signal processing unit is provided with a directivity control unit to which directivity control data are input in order to determine the directivity during sound collection by controlling the control filters wherein each of the control filters is represented by H (ω
)=[C(ω
)T·
C(ω
)]−
1C(ω
)T·
A(ω
), where the control filter matrix is H (ω
), the desired response function matrix is A (ω
), and the transfer function is C (ω
), and is obtained by solving the inverse matrix [C (ω
)T·
C (ω
)]−
1C(ω
)T of the transfer function matrix C (ω
). - View Dependent Claims (2, 3)
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4. A sound collection and reproduction method, according to which a plurality of sound collection devices are arranged in proximity to one another, control filters in a number corresponding to the number of reproduction channels are connected to each of the sound collection devices, and the output signals from the control filters of each of the channels are added for each of the channels and output from each of the reproduction channels, the method compromising:
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collecting sounds by a plurality of sound collection devices, setting a plurality for control points in a sound field around the plurality of sound collection devices, providing directivity control data in order to determine the directivity during sound collection by controlling the control filters, determining a desired response function matrix and a transfer function matrix of the control filters between the control points and each of the sound collection devices on the basis of measurement values, determining values of the control filters on the basis of the desired response function matrix and transfer function matrix between the control points corresponding to the designated directivity and each of the sound collection devices to produce a control filter matrix, filtering the collected sounds based on the control filter matrix by the control filters to produce filtered output signals, adding the filtered output signals from the respective control filters for the respective reproduction channels, and outputting the added filtered output signals to a reproduction output unit, wherein the values of the control filters are determined in accordance to the
H(ω
)=[C(ω
)T·
C(ω
)]−
1C(ω
)T·
A(ω
),where the control filter matrix is H (ω
), the desired response function matrix is A (ω
),and the transfer function is C (ω
), and is obtained by solving the inverse matrix[C(ω
)T·
C(ω
)]−
1C (ω
)T of the transfer function matrix C(ω
). - View Dependent Claims (5, 6)
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Specification
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Current AssigneeHareo Hamada
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Original AssigneeDimagic Co., Ltd.
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InventorsHamada, Hareo, Murayama, Yoshitaka, Goto, Akira
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Primary Examiner(s)Phan, Hai
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Application NumberUS12/094,491Publication NumberTime in Patent Office1,912 DaysField of Search381/92, 381/94.1, 381/94.3, 381/56, 381/58, 381/23, 700/94US Class Current381/92CPC Class CodesH04R 5/027 Spatial or constructional a...H04S 2400/15 Aspects of sound capture an...H04S 3/002 Non-adaptive circuits, e.g....H04S 5/005 of the pseudo five- or more...
