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
Hilbert Francis H.
Parker Norman W.
Gillman James W.
Motorola Inc.
Olms Douglas W.
Parker Margaret Marsh
Pristelski James S.
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