Audio-visual diplexed television transmitter in which the aural

Details Audio-visual diplexed television transmitter in which the aural Audio-visual diplexed television transmitter in which the aural

1982-12-06

1985-01-01

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358143, H04N 538, H04N 540, H04N 704

Patent

active

044918712

ABSTRACT:
A television transmitter uses a diplexer to combine the signals from a visual power amplifier and an aural power amplifier. The diplexer uses hybrids coupled together by transmission lines, and the transmission-lines have aural-frequency cavities which reflect the aural energy from the aural input port to the antenna output port. In the event that the aural power amplifier fails, it is desirable to revert to multiplexed operation, in which the visual amplifier amplifies combined visual and aural signals. This mode of operation is accomplished by switching the low-level aural signal for combining with the low-level visual signal and by simultaneously switching the tuning of the aural cavities.

REFERENCES:
patent: 4007480 (1977-02-01), Wolters
patent: 4240155 (1980-12-01), Vaughan
patent: 4339773 (1982-07-01), Chemin et al.
Data Sheet--Micro Communications Inc.--Series 4800 High-Power Waveguide Diplexers.

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