Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1990-03-08
1993-05-04
Shaw, Dale M.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 47, 381 41, 381 92, 381155, G10L 300, H04R 300, H04R 7500
Patent
active
052088642
ABSTRACT:
According to a method of detecting an acoustic signal, first and second sound receiving units are located at substantially the same position and are used to output signals having different target signal power to noise power ratios (S/N ratios). When a difference between the powers of the signals output from the first and second sound receiving units or a ratio of the power of the signal from the first sound receiving unit to that from the second sound receiving unit in a given period falls within a predetermined range, reception of the target signal within the given period is discriminated. The first sound receiving unit is an adaptive microphone array capable of controlling directivity characteristics in correspondence with a noise position.
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Nippon Telegraph & Telephone Corporation
Shaw Dale M.
Tung Kee M.
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