Frequency modulation or pulse modulation demodulator

Details Frequency modulation or pulse modulation demodulator Frequency modulation or pulse modulation demodulator

1982-07-13

1985-04-09

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329107, 329110, 329126, 329128, 375 80, 375 82, 375 94, 455214, H03D 318, H03K 906, H04B 116

Patent

active

045104530

ABSTRACT:
A demodulator for demodulating alternating signals modulated by pulse modulation, or by frequency modulation. The demodulator requires only a single constant current source, a single ramp voltage producing capacitor, and a sample-and-hold function. The intelligence contained in the modulated carrier is transformed into a first pulse train, and a second pulse train is produced in response to the first pulse train. The first pulse train samples and holds the ramp voltage, and the second pulse train immediately resets the ramp voltage circuit following each sample. The held voltage is a replica of the modulating signal, produced without the use of filters for removing the carrier.

REFERENCES:
patent: 3553597 (1971-01-01), Bugay
patent: 3961277 (1976-06-01), Rossi et al.
Belleson, J. G., "Wideband Frequency Demodulator", IBM Technical Disclosure Bulletin, vol. 9, No. 10, (Mar. 1967), pp. 1464-1466.

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