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Compatible stereophonic receiver

  • US 4,016,366 A
  • Filed: 07/14/1975
  • Issued: 04/05/1977
  • Est. Priority Date: 07/17/1974
  • Status: Expired due to Term
First Claim
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1. A compatible stereophonic receiver comprising a circuit for receiving a monaural signal, 2-channel stereophonic composite signal and multi-channel stereophonic composite signal transmitted in the frequency modulated form and generating an intermediate frequency signal including any of said signals;

  • amplifier means for amplifying said intermediate frequency signal;

    frequency modulated wave detection means for detecting said included signal from the output of said amplifier means; and

    a multiplex demodulator coupled to said detection means and adapted to demodulate an audio signal included in any of said detected monaural signal, 2-channel stereophonic composite signal and multi-channel stereophonic composite signal, wherein said intermediate frequency signal amplifier means includes a plurality of band amplifier means each having a band width different from each other;

    said detection means includes at least one frequency modulated wave detector for detecting said included signal from an output of any of said band amplifier means; and

    said stereophonic receiver further comprises a discriminator coupled to said frequency modulated wave detector to determine whether a signal received is a monaural signal, 2-channel stereophonic composite signal or multi-channel stereophonic composite signal, and means for selectively connecting a band amplifier means which has a band width corresponding to an output signal from the discriminator to said multiplex demodulator through a frequency modulated wave detector and for controlling said multiplex demodulator to demodulate an audio signal from the output of said frequency modulated wave detector.

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