Digital frequency shift signal demodulator

Details Digital frequency shift signal demodulator Digital frequency shift signal demodulator

1977-07-15

1978-09-19

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325320, 329107, 329126, H03D 304, H03K 906, H04L 2714

Patent

active

041157389

ABSTRACT:
An FS signal demodulator includes a zero-crossing detector which detects zero-crossings of frequency shift signals (FS), a pulse converter which generates a train of "0" and "1", "0" representative of a time slot from the first detected zero-crossing through a given period of time and "1" representative of a time slot from that period through the next succeeding zero-crossing, a memory means receiving the outputs of the pulse converter and thus containing the train of the pulses with the length corresponding to modulation rate, a counter means counting the number of "1's" or "0's" contained within the memory means in response to clock signals, and a determination circuit which effects frequency discrimination by comparing the counts of the counter means with a given limit.

REFERENCES:
patent: 3571712 (1971-03-01), Hellworth et al.
patent: 3636454 (1972-01-01), Pasternack et al.
patent: 4021744 (1977-05-01), Montefusco

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