FM Audio demodulator with dropout noise elimination circuit

Details FM Audio demodulator with dropout noise elimination circuit FM Audio demodulator with dropout noise elimination circuit

1980-06-25

1982-11-30

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

179 1P, 360 30, 455312, H03D 300, H04N 594

Patent

active

043618138

ABSTRACT:
A previous level holding circuit is connected to an output of an FM demodulator to eliminate dropout disturbance from a reproduced audio signal from a record medium on which an FM-modulated audio signal has been recorded. The previous level holding circuit is controlled by an output of a circuit for detecting dropout in the reproduced signal and comprises a gate circuit operable in response to a dropout detection signal and a capacitor. During the occurrence of dropout, the previous level holding circuit holds and produces the reproduced output level assumed immediately before the dropout to eliminate the noise due to the dropout.

REFERENCES:
patent: 3553390 (1971-01-01), Krause
patent: 4119812 (1978-10-01), Fox
patent: 4198541 (1980-04-01), Fukushima

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