Patent ID: 6188832
Filing Date: 2001-02-13
Classification: H04N

Abstract:
A method for processing a video signal so as to inhibit the making of acceptable videotape recordings therefrom while at the same the video is capable of producing a substantially normal picture on a television monitor/receiver, wherein the video signal has sync pulses followed by back porch intervals comprising the steps of:selecting one or more lines within said video signal;narrowing a width of the sync pulses on selected lines;significantly lowering the voltage amplitude of a first portion of a widened back porch area on said selected lines;significantly raising a voltage amplitude of a second portion of the back porch interval on said selected lines;significantly lowering the voltage amplitude of a third portion of the back porch interval;retaining the normal position of a color burst relative to the leading edge of said sync pulses; andwherein a sufficient number of lines are selected to inhibit the making of acceptable videotape recordings therefrom.