FM signal demodulating apparatus

Details FM signal demodulating apparatus FM signal demodulating apparatus

1986-12-03

1988-07-12

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 94, 329 50, 329107, 329122, 329126, H03D 318, H03K 906

Patent

active

047575204

ABSTRACT:
A FM signal demodulating apparatus with a timing pulse generator with a fixed periodic interval, a pulse deletion gate circuit whose pulse deletion ratio in a train of successive timing pulses being set in the range of 0.4 to 0.16, a edge pulse generator, a deletion delay circuit which delays 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 which receives output from the first flip flop circuit and output from the edge pulse generator, the gate circuit detecting the state in which said second counter contains all "1's" or said second counter contains all "0's".

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.
patent: 4540947 (1985-09-01), Fujimoto

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