Digital FM demodulator using delay circuits

Details Digital FM demodulator using delay circuits Digital FM demodulator using delay circuits

1982-06-14

1984-12-04

Grimm, Siefgried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329126, 329137, 329145, 375 94, 455214, H03D 318, H03K 906

Patent

active

044867166

ABSTRACT:
A digital circuit for demodulating a signal which was modulated in accordance with the relation ##EQU1## wherein .omega..sub.o is the carrier and f(t) the modulating signal. This circuit comprises first of all two distinct paths which are arranged in parallel and are formed by two digital value determining stages (20) and (30), the first stage being intended to determine the values of the function ##EQU2## which correspond to the values of the input signal of the two paths and the second stage (30) being intended to determine the derivative of the input signal for said same values of the input signal. The circuit also comprises, at the output of these two paths, a multiplying circuit (40) for corresponding signals supplied by the first and second stages (20) and (30), intended to recover a digital signal which is proportional to the instantaneous frequency of the input signal. A clock circuit (50) determines the rate of operation of the first and second stages (20) and (30) and of the multiplying circuit (40).

REFERENCES:
patent: 3387220 (1968-06-01), Lender
patent: 3778727 (1973-12-01), Williams

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