Burst phase detection circuit

Details Burst phase detection circuit Burst phase detection circuit

1991-12-12

1993-10-12

Powell, Mark R.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 10, H04N 9455

Patent

active

052530426

ABSTRACT:
A burst phase detection circuit is provided for detecting a phase difference between an input burst signal having a predetermined phase relation with a carrier of a modulated color signal and a sampling pulse. The circuit detects such phase difference based upon a digital signal obtained by demodulating the color signal in accordance with a demodulation axis of one of first and second color difference signals of the color signal. The circuit includes a first sampling circuit which samples a value of the digital signal during an interval of the burst signal within a first horizontal line period of the color signal, and a second sampling circuit for sampling a value of the digital signal during an interval of the burst signal within a second horizontal line period of the color signal. A digital adding circuit is provided for adding the values of the digital signal sampled by the first and second sampling circuits to produce an addition signal. A detection circuit serves to digitally detect a direction and an amount of a phase difference between the sampling pulse and the burst signal based on the addition signal.

REFERENCES:
patent: 4734757 (1988-03-01), Akiyama

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