Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1993-08-31
1995-08-15
Isen, Forester W.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 93, H04R 2700, H04B 1500
Patent
active
054427126
ABSTRACT:
A sound signal picked-up by a microphone is processed in a howl suppresser including a digital filter. A frequency analyzer performs frequency analysis of the picked-up sound signal. A howl detector detects a howl contained in the sound signal from a result of frequency analysis by the frequency analyzer. A coefficient calculator calculates coefficients to be input to the digital filter to suppress the howl according to a detection result by the howl detector, and a controller inputs the calculated coefficients to the digital filter. The howl detector judges that a maximum peak power level among power levels of the sound signal in a frequency region analyzed by the frequency analyzer is a howl component when a ratio of the maximum peak power level to a mean power level of the sound signal is larger than a predetermined threshold level, preferably for a predetermined threshold time. Also, a threshold controller is provided for controlling the threshold level and/or the threshold time so as to enhance the accuracy of the howl detection.
REFERENCES:
patent: 4888808 (1989-12-01), Ishikawa et al.
patent: 5245665 (1993-09-01), Lewis et al.
Kawamura Akihisa
Matsumoto Masaharu
Numazu Hiroko
Serikawa Mitsuhiko
Isen Forester W.
Matsushita Electric - Industrial Co., Ltd.
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