Detector using delayed and undelayed inputs for demodulating FM

Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...

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Details

329110, 329140, 455214, H03D 306

Patent

active

045381127

ABSTRACT:
A differential detector is disclosed that is used in FM or PM receivers for demodulating a modulated carrier signal. The detector uses a mixer/phase detector for combining an intermediate frequency phase modulated or frequency modulated signal with the same signal delayed to demodulate the signal. Delay inherrent in an IF filter of the receiver in which the detector is utilized for this purpose. The undelayed and delayed signals required for operation of my differential detector are obtained from the input and output respectively of the IF filter. The output from my detector has spurious signals not typically present in the output of prior art differential detectors but these spurious signals are removed by a filter including low pass, band reject and/or notch filtering to yield only the modulating signal.

REFERENCES:
patent: 3392337 (1968-07-01), Neuburger
patent: 3778727 (1973-12-01), Williams
patent: 3821654 (1974-06-01), Van Anrooy
patent: 4307347 (1981-12-01), Thomson
patent: 4375618 (1983-03-01), Jett, Jr.

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