Patent ID: 8116479

Claim:
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, 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)] −1 C(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)] −1 C(ω) T of the transfer function matrix C (ω).