Patent
1977-02-07
1978-05-09
Claffy, Kathleen H.
179 1AT, H03J 524
Patent
active
040888355
ABSTRACT:
A feedback elimination apparatus for a sound system which employs a notch filter assembly comprising a plurality of active notch filters, each capable of producing a narrow notch in the frequency characteristic of the system. Means are provided for temporarily switching each notch filter to an oscillating mode to produce a reference signal at notch frequency which, for adjustment purposes, is zero beat with an acoustic feedback signal in the system, so the feedback signal is canceled when the notch filter is returned to its normal mode. A compressor is temporarily interposed in the sound system for limiting and controlling the level of the acoustic feedback signal to facilitate separation of acoustic feedback signals of different frequency and to prevent overload. An equalizer is also interposed in the system and which, in addition to performing its equalization function, is capable of producing a relatively wide notch in the frequency characteristic of the system for canceling the points of acoustical feedback grouped in frequency.
REFERENCES:
patent: 3183304 (1965-05-01), Schroeder
patent: 3256391 (1966-06-01), Boner
patent: 3752928 (1973-08-01), Flickinger
patent: 3755749 (1973-08-01), Van Ryswyk
patent: 3789143 (1974-01-01), Blackmer
patent: 3991272 (1976-11-01), Tarr
patent: 4002994 (1977-01-01), Fender
Heinz Harro K.
Thurmond George R.
Claffy Kathleen H.
Kemeny E. S.
Rauland-Borg Corporation
LandOfFree
Comprehensive feedback elimination system employing notch filter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Comprehensive feedback elimination system employing notch filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Comprehensive feedback elimination system employing notch filter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2358772