STEREO MULTIPLEX
The disadvantages of the two-station method made it imperative that a method of transmitting both signals on one carrier be devised. The result is the method called stereo-multiplex. Multiplex means a method of sending two or more messages simultaneously on one carrier or circuit. This is exactly what stereo multiplex does—it transmits both channels on the same FM carrier.
The standard FM broadcast system is based on an audio frequency response of approximately 0 to 15 kHz. There is nothing about the basic modulating systems to prevent extension of this audio-frequency range to 75 kHz (further extension would require more bandwidth than is currently allotted by FCC). Therefore, if at some point above the limit of human hearing ...
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