H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/3
H04N 7/00 (2006.01) H04N 5/38 (2006.01)
Patent
CA 1190638
11 ABSTRACT OF THE DISCLOSURE The retransmission equipment comprises an automatic control circuit of the image/sound ratio in the television signal. This RAC circuit placed between the intermediate frequency translation mixer and the intermediate frequency amplifier comprises a power distributor between an image channel and a sound channel having respectively an image filter and a sound filter, couplers and an output adder connected to the main outputs of the couplers. The sound channel also has a variable gain amplifier, whose gain is controlled by an error signal, so as to keep the image/sound ratio constant. This error signal results from the comparison of the detected amplitudes of the image and sound components sampled by the couplers in the two channels. This circuit also permits the correction of the cross modulation resulting from non-linearities of amplifiers by the control of the same variable gain amplifier.
416993
Goudreau Gage Dubuc
L.g.t. Laboratoire General Des Telecommunications
LandOfFree
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