Compatible stereophonic receiver
First Claim
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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Abstract
A compatible stereophonic receiver capable of receiving a monaural signal, 2-channel stereophonic composite signal and multi-channel composite signal transmitted in the frequency modulated form, which comprises a plurality of band amplifiers each having a bandwidth different from each other so as to amplify an intermediate frequency signal including any of the above-mentioned signals; a discriminator for determining whether the signal received is a monaural signal, 2-channel composite signal, or multi-channel composite signal; and means for selectively connecting a band amplifier which has a bandwidth corresponding to an output signal from the discriminator to a multiplex demodulator through a frequency modulated wave detector and controlling the multiplex demodulator to demodulate an audio signal from the output of the frequency modulated wave detector.
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Citations
8 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- amplifier means for amplifying said intermediate frequency signal;
Specification