FM-sound demodulator for TV sound signals and method of detectin

Details FM-sound demodulator for TV sound signals and method of detectin FM-sound demodulator for TV sound signals and method of detectin

1998-02-25

1999-12-28

Mis, David

Demodulators

Frequency modulation demodulator

Input signal combined with local oscillator or carrier...

329321, 331 12, 331 23, 331DIG2, 348726, 348735, 348738, 455209, 455210, 455214, 455337, H03D 300, H03L 7095, H04N 546, H04N 552

Patent

active

060086939

ABSTRACT:
For a possible simple structure, dispensing with ceramic filters, an FM demodulator for demodulating sound-FM signals comprises a controllable amplifier (1) which receives the sound signals converted to intermediate frequencies, said amplifier having a gain which is adjusted by means of an amplitude control circuit (4) and whose output signal is applied to the amplitude control circuit and to the phase-locked loop which supplies a demodulated sound signal in the locked-in state from its output, said phase-locked loop including a loop filter (7) which comprises a filter (8, 9, 10) of at least the second order with a pole at the frequency f=0, and a limit-detection circuit (13) which feeds back the operating frequency of the phase-locked loop to a predetermined frequency range when said phase-locked loop leaves this frequency range around a predeterminable nominal demodulation frequency, the amplitude control circuit (4) controlling the controllable amplifier (1) in dependence upon its output signal and a signal dependent on the frequency of the output signal of a voltage-controlled oscillator (14) in the phase-locked loop in such a way that the output signals of the controllable amplifier (1) have a nominal amplitude.

REFERENCES:
patent: 5631601 (1997-05-01), Horsfall et al.

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