The concept of AM stereo was demonstrated over 50 years ago and just recently it has been put into commercial use. A PC-based quadrature amplitude modulation (C-QUAM) stereo test signal generator has been developed in which a computer software package and D/A converters simulate a baseband test signal and an atmospheric communication channel. The receiver is a C-QUAM decoder IC that accepts an input signal at IF. There are two other AM stereo systems in use and they may also be tested with this project by modifying the software program and choosing the appropriate decoder.
 

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