The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 29, 2003
Filed:
Sep. 13, 1999
Gerow D. Brill, Danbury, CT (US);
John O. Ryan, Woodside, CA (US);
Macrovision Corporation, Santa Clara, CA (US);
Abstract
A video signal is modified so that a television receiver will provide a normal color picture but a video tape recorder will detect the modification and prohibit the video signal from being recorded. The color burst phase of the video signal is modified so as to make inferior quality pictures in the event that the resulting modified video signal is recorded. A disabling circuit ( ) associated with the recorder ( ) detects the presence of the modified video signal. This detection is done by determining the presence of modified color burst phase signals in even a single television line of the video signal. A control signal ( ) is produced when the modified color burst phase signal is detected, which disables the recorder ( ). If no modified color burst phase signal is detected, the recorder ( ) is enabled to allow an acceptable recording of the video signal.