Electrical audio signal processing systems and devices – Directive circuits for microphones
Reexamination Certificate
2006-05-02
2006-05-02
Grier, Laura A. (Department: 2644)
Electrical audio signal processing systems and devices
Directive circuits for microphones
C348S211100
Reexamination Certificate
active
07039200
ABSTRACT:
A system and process for estimating the time delay of arrival (TDOA) between a pair of audio sensors of a microphone array is presented. Generally, a generalized cross-correlation (GCC) technique is employed. However, this technique is improved to include provisions for both reducing the influence (including interference) from correlated ambient noise and reverberation noise in the sensor signals prior to computing the TDOA estimate. Two unique correlated ambient noise reduction procedures are also proposed. One involves the application of Wiener filtering, and the other a combination of Wiener filtering with a Gnnsubtraction technique. In addition, two unique reverberation noise reduction procedures are proposed. Both involve applying a weighting factor to the signals prior to computing the TDOA which combines the effects of a traditional maximum likelihood (TML) weighting function and a phase transformation (PHAT) weighting function.
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Florencio Dinei A.
Rui Yong
Grier Laura A.
Lyon Richard T.
Lyon & Harr,LLP
Microsoft Corporation
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