Sampling pulse forming circuit for FM stereo demodulator

Details Sampling pulse forming circuit for FM stereo demodulator Sampling pulse forming circuit for FM stereo demodulator

1981-05-15

1984-02-21

Hickey, R. J.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

329112, 329122, H04H 500

Patent

active

044334338

ABSTRACT:
A sampling pulse generator circuit for a stereo demodulator circuit of a sample and hold system is disclosed. The pulse generator circuit uses pilot signals of an FM stereo broadcast as an input and produces output sampling pulses, which are phase-synchronized to the stereo subcarrier but have a 180.degree. phase difference to each other. The pulse generator circuit comprises a phase lock loop circuit having a multiple number of frequency dividers arranged in cascade. Selected outputs of these frequency dividers are logically summed to produce the output sampling pulses with a predetermined and stable pulse width.

REFERENCES:
patent: 3902019 (1975-08-01), Bruene
patent: 3961276 (1976-06-01), Kurata
patent: 3962551 (1976-06-01), Gay
patent: 4037055 (1977-07-01), Sato et al.
patent: 4264784 (1981-04-01), Lorea

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