Compatible four channel FM system

Details Compatible four channel FM system Compatible four channel FM system

1976-01-14

1980-02-26

Olms, Douglas W.

H04H 500

Patent

active

041907370

ABSTRACT:
A four channel FM system is described. In one embodiment the usual 19 kHz pilot signal is employed to switch between front and rear information, while in another, a 76 kHz switching signal is employed for this purpose.

REFERENCES:
patent: 3122610 (1964-02-01), Csicsatka
patent: 3133993 (1964-05-01), DeVries
patent: 3257511 (1966-06-01), Adler
patent: 3538259 (1970-11-01), Brahman
patent: 3708623 (1973-01-01), Dorren
patent: 3822365 (1974-07-01), Dorren
"Quadrasonics on the Air" by Feldman, in Audio Jan. 1970, pp. 22-24, 78 & 79.
Carrier Current Telephone and Telegraphy, Colpitts et al, "Transaction of the AIee" vol. XL, Jan.-Dec. 1921.

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