Demodulator for the demodulation of a frequency-modulated signal

Details Demodulator for the demodulation of a frequency-modulated signal Demodulator for the demodulation of a frequency-modulated signal

1996-08-29

1998-09-15

Mis, David

Demodulators

Frequency modulation demodulator

Input signal converted to and processed in pulse form

329336, 455214, 455337, H03D 300, H03D 318

Patent

active

058085106

ABSTRACT:
Radio receivers for frequency-modulated signals and more particularly, in such receivers, to a device for the demodulation of a signal modulated at intermediate frequency f.sub.i. The signal F.sub.M that is frequency modulated around a frequency f.sub.i is applied, after conversion into a square-wave signal F.sub.MR, to a delay line with shift registers that is controlled by the signals provided by an oscillator. Each of the three cascade-connected sections of the delay line introduces a delay 1/4f.sub.i and the output signals of each section are applied to EXCLUSIVE OR circuits that respectively give a demodulated signal F.sub.R1, a signal F.sub.R2 for the suppression of a demodulated signal and a signal F.sub.R3 to control the frequency of the oscillator.

REFERENCES:
patent: 4064361 (1977-12-01), Kustka et al.
patent: 4603301 (1986-07-01), Dukes et al.

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