Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1980-08-18
1983-02-08
Olms, Douglas W.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
332 17, 332 37D, 455126, H04H 500
Patent
active
043731155
ABSTRACT:
An apparatus for generating a composite AM stereo broadcast signal wherein a carrier is angle modulated with stereo difference information contained in a first supplied signal and the angle-modulated carrier is then amplitude modulated with stereo sum information contained in a second supplied signal, an improvement wherein distortion is predicted by the use of a simulated transmitter and receiver to generate a correction signal having distortion representative components. Correction signals developed in this manner are used to modify the angle-modulated signal utilizing a feedback technique, a subtractive technique, or both, thereby reducing distortion in the output of the stereo difference signal channel of actual AM stereo receivers which receive said composite AM stereo signal.
REFERENCES:
patent: 2033136 (1936-03-01), Ferrell
patent: 2085125 (1937-06-01), Shaw
patent: 2159020 (1939-05-01), Ferrell
patent: 3068475 (1962-12-01), Avins
patent: 3085203 (1963-04-01), Logan et al.
patent: 4147985 (1979-04-01), Rogers
patent: 4181889 (1980-01-01), Davis
patent: 4225751 (1980-09-01), Hershberger
"Polar-Loop Transmitter", Electronics Letter, May 10, 1979, vol. 15, No. 10, pp. 286-288.
Agovino Frank R.
Olms Douglas W.
Onders Edward A.
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