Compatible AM stereophonic system

Details Compatible AM stereophonic system Compatible AM stereophonic system

1980-06-04

1982-07-06

Olms, Douglas W.

H04H 500

Patent

active

043384919

ABSTRACT:
The signal as transmitted is a compatible AM stereophonic signal with amplitude directly proportional to the monophonic signal 1+L+R. The instantaneous phase angle is the quadrature phase angle modified in that high level, high frequencies in the L-R channel are reduced before carrier modulation. The gain in the high frequency L - R channel may be reduced in proportion to the signal level only, or to both level and frequency, or to the percent of distortion introduced into the high frequencies of the L - R signal by RF filtering of the modulated carrier.

REFERENCES:
patent: 3068475 (1962-12-01), Avins
patent: 3257512 (1966-06-01), Eilers
patent: 4225751 (1980-09-01), Hershberger

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