COMPATIBILITY
There will always be some listeners who don't care about being equipped for stereo reception. Also, for portable use, and where cost is to be minimised, a conventional single-channel receiver is called for. For this reason, it is important that the stereo system be compatible. By compatible we mean that while stereo multiplex transmission is in progress a listener with a conventional receiver (one not equipped for stereo) should be able to receive the transmission as a full monophonic signal.
If one channel of the multiplex system is used for the L signal and the other for the R signal, compatibility is not provided. The owner of the conventional receiver hears only the modulation of the main carrier, which in this case would be ...
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