COMPATIBLE AM STEREO BROADCAST SYSTEM

摘要

76819 A COMPATIBLE AM STEREO BROADCAST SYSTEM A compatible AM stereo broadcast system has a pair of carriers in quadrature are separately modulated with stereo information. The resulting signal is multiplied by the cosine of an angle ?, the angle between the vector sum of the two carriers and a line that bisects the angle between the carriers in quadrature. The signal envelope contains the sum of the information on the two channels, thus providing compatible monophonic reception. In a stereo receiver the two carriers in quadrature can be restored by dividing the signal by the cosine of the angle ?. The original modulation can be obtained from each channel by product detection.