Independent sideband am multiphonic system

Details Independent sideband am multiphonic system Independent sideband am multiphonic system

H - Electricity

04

H

325/37

H04H 5/00 (2006.01)

Patent

CA 1125861

DOCKET R4091 IMPROVED INDEPENDENT SIDEBAND AM MULTIPHONIC SYSTEM ABSTRACT OF THE DISCLOSURE An improved transmitter for a compatible indepen- dent sideband (ISB) AM stereo system developes a phase modulated carrier where the modulation represents the stereo difference signal inverse modulated by the stereo sum signal in accordance with a selected modulation function. The phase modulated carrier then is amplitude modulated by the stereo sum signal. This simplified modulation scheme provides the second-harmonic sideband correction required to develop a true single sideband type signal wherein left and right stereo information are transmitted in separate lower and upper sidebands, which can be demodulated without distortion in ISB AM stereo receivers. Simplified receivers which use inverse modulation are also disclosed. - 1 -

323915

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