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

1990-12-20

1992-10-20

Shaw, Dale M.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358310, 380 3, H04N 576

Patent

active

051575108

ABSTRACT:
A method and apparatus for disabling the effect of copy-protect signals added to a video signal using differences in the characteristics of television and VCR circuitry. Copy-protect signals as described include pseudo-sync pulses and/or added AGC pulses in the vertical blanking intervals of a video signal. The specific method described includes increasing the effective frequency of the copy-protect signals during the vertical blanking intervals 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 comprises pulse narrowing and/or pulse multiplication circuitry which effectively increases the high-frequency content of the pseudo-sync and/or AGC pulses.

REFERENCES:
patent: 4626890 (1986-12-01), Ryan
patent: 4951315 (1990-08-01), Switsen

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