Sine-wave decoding technique

Details Sine-wave decoding technique Sine-wave decoding technique

H - Electricity

04

N

350/26

H04N 7/16 (2006.01) H04N 7/171 (2006.01)

Patent

CA 1192994

ABSTRACT A decoder includes an oscillator supplying a decoding signal to the control input of an RF modulator for decoding a sine wave encoded television signal. The decoding signal developed by the oscillator is randomly phase locked in either of two states with the output of a horizontal sync separator operated in response to the detected output of the RF modulator. In the first phase locked state, the decoding signal is in antiphase relationship with the encoding modulation resulting in a properly decoded baseband video signal. In the second phase locked state, the decoding signal is in phase alignment with the encoding modulation so as to constructively combine therewith. The second phase locked state is detected and broken each time it is assumed allowing the decoder to eventually assume the first phase locked state wherein a properly decoded video signal is produced.

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