Digital frequency-modulated demodulation

Details Digital frequency-modulated demodulation Digital frequency-modulated demodulation

1984-03-12

1985-12-10

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329110, 329122, H03D 304

Patent

active

045582840

ABSTRACT:
The frequency-modulated demodulator is provided in which the frequency-modulated signal as having a relatively narrow range of frequency modulation is demodulated by providing a pulse which corresponds to the positive half-wave cycles of the signal and then generating an extended duration pulse from the initiation of the first pulse produced to the second pulse produced in two consecutive cycles. In this manner every other cycle of the FM demodulated signal provides an output pulse which substantially corresponds to the duration of one cycle of the FM signal. A high frequency clock on the order of 1,000 times faster than the frequency of the extended duration signals is gated through for substantially the entire width of the extended pulse duration. The number of clock pulses that are gated through or counted to provide an indication of the frequency signal, a sampled basis corresponding to every other cycle of the FM signal.

REFERENCES:
patent: 3670250 (1972-06-01), Fritkin
patent: 4232267 (1980-11-01), Hanajima et al.

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