FIELD: television. SUBSTANCE: the TV picture signal masking and unmasking device has on the transmitting side - a video signal source, mixing amplifier, synchronizing generator, modulator, oscillator, transmitter output stage, counter, multivibrator, switch, pseudo-random pulse generator, output modulator, cubcarrier generator, adder, and on the receiving side - a channel selector, intermediate-frequency amplifier, video detector, emitter follower, amplitude selector, distributing unit, second counter, subcarrier multivibrator, second switch, filter, TV receiver. EFFECT: enhanced degree of masking and unmasking of TV picture signal. 2 dwg
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|---|---|---|---|
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|
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