Word: multiplexes
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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...
...spur stereo broadcasting, the Federal Communications Commission granted permission for FM stations to test stereo "multiplexing," a system that sends the two separate signals over a single radio frequency. New York City's WBAI started to broadcast stereo last week; WRCA-FM will begin next week. Manhattan's two-year-old Madison Fielding Corp. last month put out a multiplex stereo adapter that can be attached to any FM radio, turn it into a stereo set. Price...
Tales of Manhattan (20th Century-Fox) is a multiplex answer to a Hollywood producer's dream-a show that telescopes parts for nine stars and five dramatic episodes in one over-all picture. The only continuity is provided by a tail coat which appears in each episode in a hand-me-down career from the shoulders of a rich wastrel to a scarecrow...