Circuit for suppressing noise caused by scratches on a phonograp

Details Circuit for suppressing noise caused by scratches on a phonograp Circuit for suppressing noise caused by scratches on a phonograp

1978-10-10

1980-06-17

Mullins, James B.

Amplifiers

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

179 1P, 1791004A, 330124R, H03F 126

Patent

active

042086345

ABSTRACT:
A circuit for suppressing pulse-shaped interferences in an audio signal caused by scratches on a phonograph disc, comprising a signal processing section connected between an audio frequency input and an audio frequency output, comprising a noise suppressor having a control input; as well as a control signal section connected between the audio frequency input and the control input, said control signal section comprising a first threshold selection circuit connected to the audio frequency input for selecting pulse-shaped signals from the audio signal, followed by a second threshold selection circuit for distinguishing the pulse-shaped signals originating from noise signals from those originating from musical signals.

REFERENCES:
patent: 3593334 (1971-07-01), Bickel
patent: 3803357 (1974-04-01), Sacks
patent: 4143333 (1979-03-01), Jacobsen et al.
Wright--"Use Slew-Rate Filtering"--Electronics Design pp. 110-112, Sep. 13, 1976. _

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