Angle-modulated stereo system

Details Angle-modulated stereo system Angle-modulated stereo system

1979-07-17

1980-12-09

Olms, Douglas W.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

179 1GS, 329 50, 329167, 332 21, 332 40, H04H 500

Patent

active

042386420

ABSTRACT:
An angle-modulated transmitter generates a two-channel stereo wave by double-sideband angle modulation of a carrier with a first signal, double-sideband angle modulation of the same carrier, delayed less than 90.degree., with a second signal, and addition of the two modulated waves linearly, or an equivalent method, to produce a combined wave from which the two signals can be readily separated, which can compatibly be received by an f-m mono receiver, and which occupies the frequency band of a mono channel of the same bandwidth and deviation ratio.

REFERENCES:
patent: 3069679 (1962-12-01), Sweeney et al.
patent: 3148342 (1964-09-01), Holt
patent: 3218393 (1965-11-01), Kahn
patent: 3231672 (1966-01-01), Collins et al.
Radio Engineers Handbook, by Terman, McGraw-Hill, 1943.
Transmission Systems for Communications by Bell Telephone Labs, 1971, pp. 116 to 118 & 125 to 128.
Reference Data for Radio Engineers, N.Y. 1970, pp. 21-14.
Black, Modulation Theory, New York 1953, pp. 37 to 42.
"AM Stereo: Five Competing Options," I.E.E.E. Spectrum, Jun. 1978 pp. 24-31.
R. Weiss "Heart-Sound Discriminator . . ." Electronics 34:24 p. 52, 1968.
Prigozy, "Zero Crossing Detector . . ." Electronics, Apr. 19, 1965, p. 91.
Ferrara, "Delayed Output Pulse Generator" EEE 13:10 p. 71.

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