Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1999-06-07
2000-09-26
Isen, Forester W.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 93, H04B 1500
Patent
active
061251879
ABSTRACT:
Disclosed howling eliminating apparatus comprises frequency analyzing means 32 for detecting a frequency which causes howling, band eliminating means 20 for eliminating a band including the howling frequency detected by the frequency analyzing means, and controlling means 30 for controlling both the frequency analyzing means and the band eliminating means in their characteristics. The frequency analyzing means is controlled to divide input frequencies into a plurality of wide bands, detect howling status in each of the divided wide bands to isolate one wide band suspected to include the howling frequency. When the one wide band causing the howling is isolated, the frequency analyzing means divides the suspected wide band into a plurality of narrow bands, and detects the howling frequency in one of the narrow bands. The band eliminating means is controlled to eliminate the narrow band including the howling frequency. The apparatus thus shortens the time it takes to detect howling with a minimum of hardware.
REFERENCES:
patent: 5442712 (1995-08-01), Kawamura et al.
patent: 5649019 (1997-07-01), Tomasson
patent: 5677987 (1997-10-01), Seki et al.
patent: 5910994 (1999-06-01), Lane et al.
patent: 5999631 (1999-12-01), Porayath et al.
Hanajima Mitsuru
Okuma Toshiyuki
Yoneda Michiaki
Isen Forester W.
Pendleton Brian Tyrone
Sony Corporation
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