Microphone array apparatus
First Claim
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1. A microphone array apparatus comprising:
- a microphone array including microphones;
linear predictive filters receiving output signals of the microphones;
linear predictive analysis units which receives the output signals of the microphones and update filter coefficients of the linear predictive filters in accordance with a linear predictive analysis; and
a sound source position detector which obtains a crosscorrelation coefficient value based on linear predictive residuals of the linear predictive filters and outputs information concerning the position of a sound source based on a value which maximizes the crosscorrelation coefficient value.
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Abstract
A microphone array apparatus includes a microphone array including microphones, one of the microphones being a reference microphone, filters receiving output signals of the microphones, and a filter coefficient calculator which receives the output signals of the microphones, a noise and a residual signal obtained by subtracting filtered output signals of the microphones other than the reference microphone from a filtered output signal of the reference microphone and which obtain filter coefficients of the filters in accordance with an evaluation function based on the residual signal.
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2 Claims
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1. A microphone array apparatus comprising:
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a microphone array including microphones;
linear predictive filters receiving output signals of the microphones;
linear predictive analysis units which receives the output signals of the microphones and update filter coefficients of the linear predictive filters in accordance with a linear predictive analysis; and
a sound source position detector which obtains a crosscorrelation coefficient value based on linear predictive residuals of the linear predictive filters and outputs information concerning the position of a sound source based on a value which maximizes the crosscorrelation coefficient value. - View Dependent Claims (2)
a target sound source is a speaker; and
the linear predictive analysis unit updates the filter coefficients of the linear predictive filters by using a signal which drives the speaker.
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Specification
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Current AssigneeFujitsu Limited
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Original AssigneeFujitsu Limited
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InventorsMatsuo, Naoshi
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Primary Examiner(s)Mei, Xu
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Application NumberUS10/035,507Publication NumberTime in Patent Office984 DaysField of Search367/118, 367/119, 367/129, 381/91, 381/92, 381/122, 381/111, 381/113, 381/26, 381/66, 704/219US Class Current381/92CPC Class CodesH04R 2201/403 Linear arrays of transducersH04R 2410/05 Noise reduction with a sepa...H04R 2430/23 Direction finding using a s...H04R 3/005 for combining the signals o...
