Data extraction circuit used for reproduction of character data
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United States of America Patent
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Oct 8, 2002
Grant Date -
N/A
app pub date -
Dec 21, 1999
filing date -
Dec 24, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a data extraction circuit used for reproducing character data such as a closed caption and a text, a horizontal sync digital PLL circuit generates an fh sync system clock signal, which is synchronized with a horizontal sync signal fh, in response to a digital video signal from an ADC. Based on the fh sync system clock signal, a clock generation circuit generates a data extracting clock signal which is synchronized with the horizontal sync signal fh. The data extracting clock signal can thus be caused to follow horizontal jitters. Consequently, character data can be reproduced with stability, irrespective of variations in frequency.
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