Impulse noise removing apparatus

Details Impulse noise removing apparatus Impulse noise removing apparatus

1977-05-16

1979-03-06

Mullins, James B.

Amplifiers

Hum or noise or distortion bucking introduced into signal...

328165, 328167, 330124R, H03F 126

Patent

active

041433335

ABSTRACT:
In a noise reduction system of the type in which an audio signal is delayed in time to permit detection of and reaction to impulse noise before application of the audio signal to a loudspeaker or the like, a transformed version of the audio signal is compared with its time-averaged value, and a resulting detection signal is processed into a control signal with blanking periods that vary as a function of corresponding impulse noise. The detection produces a response to both large impulses which stand out from the audio signal and small impulses which are hidden in the audio signal. The control signal tailors its response to the size of the impulse, blanking the audio signal substantially only for the duration of the impulse. Auxilliary circuitry is provided.

REFERENCES:
patent: 3495244 (1970-02-01), Rosa
patent: 3569852 (1971-03-01), Berkovitz
patent: 3588705 (1971-06-01), Paine
patent: 3678416 (1972-07-01), Burwen
patent: 4038539 (1977-07-01), Van Cleave
Cowley, "Self-Adaptive Filter", IBM Technical Disclosure Bulletin, vol. 12, No. 12, May 1970, pp. 2098-2099.

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