Compatible stereophonic receiver

Details Compatible stereophonic receiver Compatible stereophonic receiver

1975-07-14

1977-04-05

Olms, Douglas W.

H04H 500

Patent

active

040163660

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.

REFERENCES:
patent: 3466399 (1969-09-01), Dias
patent: 3466400 (1969-09-01), Dias
patent: 3679832 (1972-07-01), Halpern
patent: 3881063 (1975-04-01), Mawake et al
"Multiplex Methods for FM Broadcast Transmission of Four-Channel Stereo Signals" by HalStead et al., in Journal of the Audio Engineering Society, vol. 18, No. 6, Dec. 1970, pp. 624-630.
"Quadrasonics On-The-Air" by Feldman in Audio, Jan. 1970, pp. 22-24, 78 and 79.

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