Cryptography – Cryptanalysis
Patent
1991-03-27
1992-07-21
Gregory, Bernarr E.
Cryptography
Cryptanalysis
380 7, 380 23, 360 60, H04N 7167
Patent
active
051330083
ABSTRACT:
An image signal processing device used in image signal reproducing devices such as laser vision disk players and video tape recorders for processing an image signal including a copy guard signal includes a synchronizing signal detection circuit for detecting a vertical synchronizing signal and a horizontal synchronizing signal from the image signal, a counter for counting the number of the detected horizontal synchronizing signals starting from each detected vertical synchronizing signal, a copy guard signal section indication circuit for indicating a section including the copy guard signal in the image signal, a count control circuit for causing the counter to stop counting of the detected horizontal synchronizing signals or to count a substitution signal which substitutes the detected horizontal synchronzing signals during the indicated section including the copy guard signal, and an image signal processing circuit for processing the image signal in response to the count provided by the counter. An erroneous operation in the image signal processing such as production of superimposed characters due to an erroneous counting of the copy guard signal can be prevented.
REFERENCES:
patent: 4631603 (1986-12-01), Ryan
patent: 4695901 (1987-09-01), Ryan
Gregory Bernarr E.
Yamaha Corporation
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