Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1978-10-26
1980-01-08
Olms, Douglas W.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329 50, 329167, H04H 500
Patent
active
041829328
ABSTRACT:
Means and method for generation and combination at a transmitting apparatus and separation and demodulation at a receiving apparatus of two signals comprising carrier waves of the same frequency but having different phase, modulated with different programs. Receiving apparatus according to this invention eliminates one of the signals in each of its two channels by sampling the combined wave at instants of zero crossings of the carrier of that signal, at a rate at least twice the highest program frequency, and then integrating the sequence of samples so produced to give the program of the other signal. Thus this system provides relatively simply compatible a-m stereo transmission, or a-m transmission of two unrelated programs on a single carrier.
REFERENCES:
patent: 3043914 (1962-07-01), Collins
patent: 3089095 (1963-05-01), Webb
patent: 3102167 (1963-08-01), Barton
patent: 3109896 (1963-11-01), Boothroyd
patent: 3217105 (1965-11-01), Barton
patent: 3231672 (1966-01-01), Collins, Jr. et al.
"Zero-Crossing Detector . . . " by Prigozy in Electronics, Apr. 19, 1965, p. 91.
"Delayed Output Pulse Generator", EEE, 13:10, p. 71.
Transmission Systems for Communication, Bell Labs., Princeton, 1971, pp. 116, 117, 118 & 125 to 128.
Reference Data for Radio Engineers, New York, 1970, p. 21-14.
IEEE Spectrum, Jun. 1978, pp. 24-31, "AM Stereo".
FCC Release BC/FCC 78-638/95752, Docket No. 21313, Oct. 19, 1978, pp. 1-3.
Fisher Charles B.
Fisher Sidney T.
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