Multiplexed television audio signal receiver

Details Multiplexed television audio signal receiver Multiplexed television audio signal receiver

1981-04-08

1983-02-15

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358198, 455212, H04N 560, H04B 110

Patent

active

043743986

ABSTRACT:
In a receiver of the type capable of receiving a second or third subchannel audio signal which contains no pilot signal and which is multiplexed with the television audio signal, only the subchannel signal frequency components pass through a band-pass filter the output of which is fed to a clipper circuit so that the carrier level of the output is suppressed. The output of the clipper circuit is detected whether the subchannel signal is present or absent or subchannel signal is increased so that a squelch circuit is turned off and a display device is turned on or vice versa.

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