Compatible AM stereo broadcast system

Details Compatible AM stereo broadcast system Compatible AM stereo broadcast system

1979-01-30

1980-08-19

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455 61, 455 91, H04H 500

Patent

active

042185866

ABSTRACT:
A compatible AM stereo broadcasting system is disclosed in which the signal is a carrier having an amplitude directly variable with monoaural or sum (L+R) information, and having an instantaneous phase .phi. varying as a function of the resultant amplitude of the sum information (L+R) and difference information (L-R) which are established in a preselected phase relationship (quadrature). In a stereo receiver, L and R or the sum and difference signals may be restored by dividing the signal by the cosine of the angle .phi., and in a monaural receiver, the sum signal alone is detected.

REFERENCES:
patent: 3067293 (1962-12-01), Moore
patent: 3068475 (1962-12-01), Avins
patent: 3167614 (1965-01-01), Holt et al.
patent: 3218393 (1965-11-01), Kahn
patent: 4079204 (1978-03-01), Takahashi et al.

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