Circuit for and method of detecting color field sequence in a co

Details Circuit for and method of detecting color field sequence in a co Circuit for and method of detecting color field sequence in a co

1988-09-09

1990-11-13

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 19, H04N 944

Patent

active

049705814

ABSTRACT:
A multi-standard color field sequence detector includes an analog and a digital processor section, wherein the analog processor section receives a reference video input and provides the signals necessary to drive the digital processor section. A correlator control circuit counts an exact number of 13.5 MHz reference clock cycles, and then supplies a start signal to a burst correlator circuit, which takes samples of a plurality of cycles of burst and correlates the results to determine the polarity of the burst samples. If they are of a first polarity, a count value of corresponding polarity is supplied. If they are of the opposite polarity, a count value of the corresponding opposite polarity is supplied. The sequence of the polarities of the final counts are detected to identify the color field 1 for the standard being used.

REFERENCES:
patent: 4532547 (1985-07-01), Bennett
patent: 4734757 (1988-03-01), Akiyama
patent: 4788585 (1988-11-01), Suzuki

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