Method of generating information used for the copy protecting si

Details Method of generating information used for the copy protecting si Method of generating information used for the copy protecting si

1996-12-06

2000-01-25

Tran, Thai

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

386 94, 380 5, H04N 576

Patent

active

060186089

ABSTRACT:
A component of color difference signal is detected from a video component signal, and its color saturation information is compared with a predetermined threshold level, then in response to the comparison result, information is generated in order to control phase modulation such as, when the information is smaller than the threshold level, phases of color burst signals are modulated during a specified period, and when the information is larger than the threshold level, the phase stays as standard. The generated information is added to the color video signal. These steps can avoid unpleasant striped color noises appeared on a conventional color TV receiver, the unpleasant striped color noises has been caused by a modified color burst signal without the above steps.

REFERENCES:
patent: 4577216 (1986-03-01), Ryan
patent: 5243411 (1993-09-01), Shirochi et al.
patent: 5657387 (1997-08-01), Mogi et al.
patent: 5907655 (1999-05-01), Oguru
patent: 5943468 (1999-08-01), Takayama

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