Television transmitter

Details Television transmitter Television transmitter

1983-11-07

1985-11-12

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358186, H04W 704, H04W 538

Patent

active

045531625

ABSTRACT:
A television transmitter for transmitting signals including two sound channels either for dual language or stereophonic sound transmission includes a combining filter 4 having a narrow sound passband. In order to reduce the amplitude modulation of the sound signals caused by the filter characteristic on the frequency modulated sound carriers, the sound carrier signals are amplitude modulated in the opposite sense to that produced by the filter characteristics. This is achieved by passing the modulated sound carrier signals through tuned circuits (L1, C1 and L2, C2) which have their resonant frequencies and Q's appropriately chosen.

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