Compatible four channel FM system

Details Compatible four channel FM system Compatible four channel FM system

1974-06-24

1976-06-29

Olms, Douglas W.

H04H 500

Patent

active

039670694

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: 3708623 (1973-01-01), Dorren
patent: 3822365 (1974-07-01), Dorren

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