Method and apparatus for disabling anti-copy protection system i

Details Method and apparatus for disabling anti-copy protection system i Method and apparatus for disabling anti-copy protection system i

1990-11-13

1993-03-16

Brier, Jeffery A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358310, 358319, 380 5, 380 15, 360 371, 360 60, H04N 576

Patent

active

051949652

ABSTRACT:
A method and apparatus for disabling the effect of copy-protect signals placed in a recording video signals which is based on differences in the characteristics of television and VCR circuitry. Copy-protect signals include pseudo-sync pulses and/or added AGC pulses in the blanking interval of a video signal. The specific method described includes altering the level of the video signal during the vertical blanking interval, e.g., level-shifting, so as to render the copy-protect signals ineffective to prevent unauthorized copying by a VCR. A circuit for achieving the method includes a sync separator for detecting the vertical blanking interval, pulse generating circuits for producing pulses of predetermined widths during this interval, and a summing circuit for summing the predetermined pulses with copy-protect signals thereby to shift their level. An alternative method includes increasing the effective frequency of the copy-protect signals during the vertical blanking interval so as to achieve attenuation and/or low-pass filtering in the VCR circuitry to thereby render the signals ineffective in preventing copying. A circuit for achieving this method includes pulse narrowing and/or pulse multiplication circuitry which effectively increased the high-frequency content of the pseudo-sync and/or AGC pulses.

REFERENCES:
patent: 4695901 (1987-09-01), Ryan
patent: 4907093 (1990-03-01), Ryan
patent: 4912691 (1990-03-01), Jones
patent: 4951315 (1990-08-01), Switsen

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