Method and apparatus for providing or enhancing copy...

Details Method and apparatus for providing or enhancing copy... Method and apparatus for providing or enhancing copy...

2007-06-26

2007-06-26

Tran, Thai Q. (Department: 2621)

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

C386S349000, C386S349000, C386S349000

Reexamination Certificate

active

09998808

ABSTRACT:
The horizontal blanking interval (HBI) of a normal video signal is modified to enhance the playability of the applied copy protected video signal while maintaining the copy protection effectiveness. As generally known, a copy protected video signal with positive-going pulses in a back porch region causes possible black level depression. The addition of a negative-going pulse and/or negative-going and positive-going pulse pair immediately prior to the H sync signal in the front porch region causes a reduction in such black level depression while resulting in enhanced playability. In other embodiments, an amplitude extending pulse is added to a latter portion of the H sync pulse or to a latter portion of a pseudo sync pulse, to increase the negative-going amplitude of the respective pulse. Various combinations of the added pulses also are possible.

REFERENCES:
patent: 4163253 (1979-07-01), Morio et al.
patent: 5608799 (1997-03-01), Ryan et al.
patent: 6188832 (2001-02-01), Ryan
patent: 6271889 (2001-08-01), Bohm et al.
patent: 7050698 (2006-05-01), Quan
patent: 2006/0056809 (2006-03-01), Quan

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