FM Signal demodulating apparatus

Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...

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329107, 329122, 329126, 375 82, 375 94, H03D 300, H03K 906

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active

045409471

ABSTRACT:
An improved apparatus for demodulating frequency-modulated optical communication signals and magnetoelectric signals. The apparatus includes a pulse generator for generating a train of successive timing pulses, a pulse deletion gate circuit for deleting one out of three of the successive timing pulses, an edge pulse generator circuit, a delay circuit for delaying each of the edge pulses, a first counter, a second counter, a detection gate circuit, a first flip-flop circuit, a second flip-flop circuit and a gate circuit responsive to both the output of the first flip-flop circuit and the output of the edge pulse generator circuit. The first counter is adapted to start counting the output pulses of the pulse deletion gate circuit synchronously with one of the edge pulses corresponding to a clock pulse and terminate counting the pulses in response to the arrival of the next clock pulse, while the second counter is adapted to receive the contents of the first counter in parallel and in the form of a complement at the termination of the counting and count the contents according to the timing pulses received from the timing pulse generator.

REFERENCES:
patent: 3902129 (1975-08-01), Boothroyd
patent: 3908169 (1975-09-01), Tong
patent: 3949313 (1976-04-01), Tamada et al.
patent: 3962726 (1976-06-01), DeLand, Jr.

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