Methods of transmitting and recording television signals with copy generating restriction information and recording apparatus therefor
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United States of America Patent
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Oct 13, 1998
Grant Date -
N/A
app pub date -
Oct 18, 1996
filing date -
Oct 26, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Information for imposing copy generation restrictions is superimposed in the format of an XDS signal that is according to the standard of a closed caption broadcast so as to permit performance of copy generation restriction in response to such information without the need to change the structure of a TV receiver. Copy Generation Restriction Management System (CGMS) information is inserted in the format of the XDS signal defined in association with the closed caption signal superimposed on an analog TV signal at the 21-st line in a vertical blanking interval. The XDS signal is composed of a clock run-in interval, a start bit code, and a 16-bit digital signal which is divided into two bytes respectively representing first and second characters. The XDS signal and the CGMS information can be recognized from the start bit code and the first and/or second character. A recording apparatus recognizes the CGMS information on the 21-st line of a second or even-numbered field so as to perform the corresponding copy generation restriction.
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Family
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Cited Art Landscape
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