AMPLITUDMODULERAT FLERKANALSYSTEM MED OBEROENDE SIDBAND, SENDARE FOR ANVENDNING I SYSTEMET, MOTTAGARAVKODARE FOR ANVENDNING I SYSTEMET, SETT FOR BEHANDLING AV DE AMPLITUDMODULERADE FLERKANALSIGNALERNA FOR OVERFORING I F

摘要

An improved transmitter for a compatible independent sideband (ISB) AM stereo system develops 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.