Word: multiplex
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Dates: during 1960-1969
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Briefly, the system used for this (called in technical circles "multiplex stereo") consists of a coded signal combined with the station's regular broadcast. And unscrambler attached to your FM set (called a "multiplex adapter") will allow separation of the two stereo signals, which are then fed through the system as any other source would...
...lucky to be in one of the best areas in the nation for these stereo FM broadcasts. The H. H. Scott firm, manufacturer of audio components and the only company at the moment which is in full-scale production of a working and reliable multiplex unit, is located in near-by Maynard and naturally keeps an eye on the home front...
...subject to static and other kinds of interference. MPX, on the other hand, uses a single transmitter that carries two sets of signals simultaneously to a single FM stereo tuner. The main carrier contains a combination of left and right (L+R) signals; a sub-carrier (the multiplex part) transmits the "difference" between the two signals (L - R). When the two arrive at the tuner, the MPX circuitry divides them again...