Sound collection/reproduction method and device
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United States of America Patent
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Feb 14, 2012
Grant Date -
Feb 4, 2010
app pub date -
Nov 20, 2006
filing date -
Dec 5, 2005
priority date (Note) -
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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 (.omega.) and a transfer function matrix C (.omega.) 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 (.omega.) and the transfer function matrix C (.omega.) of the specified control point.
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