Frequency demodulator having automatic gain control

Details Frequency demodulator having automatic gain control Frequency demodulator having automatic gain control

1980-12-17

1983-10-18

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329122, 329136, 358 23, H03D 300, H04N 950

Patent

active

044108567

ABSTRACT:
A frequency demodulator circuit having an automatic gain control. The circuit will find particular use in SECAM color television receivers. The demodulator has two inputs; one receives alternately the reference frequency (during a sampling interval) and the frequency to be demodulated (between the sampling intervals). The other input receives a voltage for correcting the slope of the demodulator. The correcting signal is updated during each sampling and is provided by a feedback loop from the output of the demodulator, a reference frequency, and a reference voltage.

REFERENCES:
patent: 3518362 (1970-06-01), Fessard
patent: 3863264 (1975-01-01), Nelson et al.
patent: 3873923 (1975-03-01), Iten et al.

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