Electrical audio signal processing systems and devices – Directive circuits for microphones
Reexamination Certificate
2006-05-02
2006-05-02
Mei, Xu (Department: 2644)
Electrical audio signal processing systems and devices
Directive circuits for microphones
C348S014080
Reexamination Certificate
active
07039198
ABSTRACT:
An acoustic source location technique compares the time response of signals from two or more pairs of microphones. For each pair of microphones, a plurality of sample elements are calculated that correspond to a ranking of possible time delay offsets for the two acoustic signals received by the pair of microphones, with each sample element having a delay time and a sample value. Each sample element is mapped to a sub-surface of potential acoustic source locations and assigned the sample value. A weighted value is calculated on each cell of a common boundary surface by combining the values of the plurality of sub-surfaces proximate the cell to form a weighted surface with the weighted value assigned to each cell interpreted as being indicative that a bearing vector to the acoustic source passes through the cell.
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Birchfield Stanley T.
Gillmor Daniel K.
Fenwick & West LLP
Mei Xu
Pendleton Brian T.
Quindi
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