Receiver for television sound multiplex broadcasting and FM ster

Details Receiver for television sound multiplex broadcasting and FM ster Receiver for television sound multiplex broadcasting and FM ster

1979-10-12

1981-06-09

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

179 1GM, 179 1GC, 358198, H04N 546

Patent

active

042727880

ABSTRACT:
A receiver for selectively receiving either an FM-FM type television sound multiplex broadcasting or an FM-AM type FM stereo multiplex broadcasting includes a PLL (phase-locked loop) circuit for forming a 38 kHz switching carrier for demodulating an FM stereo multiplex signal during reception of the FM stereo multiplex broadcasting, which PLL circuit is concurrently used to attain various purposes in receiving the television sound multiplex broadcasting. In a first embodiment, the PLL circuit is used for FM-demodulating a subchannel signal during reception of the television sound multiplex broadcasting. In a second embodiment, the PLL circuit is used to detect a state that the television sound multiplex broadcasting wave is received during reception of the television sound broadcasting. In a third embodiment, the PLL circuit is used to detect whether the television sound multiplex broadcasting being received is a stereo broadcasting or a dual sound broadcasting.

REFERENCES:
patent: 2865987 (1958-12-01), Migard
patent: 3054058 (1962-09-01), Powler
patent: 3135922 (1964-06-01), Elamd
patent: 3686431 (1972-08-01), Kitaoka et al.
patent: 4139866 (1979-02-01), Wegner

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