Self adjusting frequency demodulating integrated circuit

Details Self adjusting frequency demodulating integrated circuit Self adjusting frequency demodulating integrated circuit

1990-01-16

1990-10-16

Grimm, Siegfried H.

Demodulators

Frequency modulation demodulator

Having specific distortion, noise or other interference...

329325, 358 23, 455214, H03D 324, H03D 326, H04N 966

Patent

active

049638319

ABSTRACT:
Self-adjusting frequency demodulation circuit comprising a frequency demodulator (13) which is designed as an integrated circuit, the adjustment being effected with the aid of a calibration signal source (7) of one single frequency and a measuring circuit (113, 35, 101) coupled to an output (113) of the frequency demodulator (13) by controlling the output signal amplitude of the frequency demodulation circuit with a multiplier (21) which is controllable by the measuring circuit and forms part of a tuning correction circuit which optionally may further include a level shifting circuit (57). The frequency demodulation circuit is particularly suitable for use in a SECAM color television receiver, only one frequency demodulator then being required for demodulating both the two color difference signals and the identification signal.

REFERENCES:
patent: 4410856 (1983-10-01), van Zanten

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