Method and apparatus for disabling anti-copy protection system in video signals

A METHOD AND DEVICE TO DEACTIVATE THE EFFECT OF PROTECTION SIGNALS AGAINST VIDEO COPIES USING THE EXISTING DIFFERENCES BETWEEN THE CHARACTERISTICS OF TELEVISION AND VCR CIRCUITS. COPY PROTECTION SIGNALS INCLUDE PSEUDO-SYNCHRONIZERS AND / OR AGC IMPULSES ADDED IN THE VIDEO EXTINCTION INTERVAL. THE METHOD ALTERS THE LEVEL OF THE VIDEO SIGNAL DURING THE VERTICAL EXTINGUISHING INTERVAL, eg, LEVEL SHIFT, TO MAKE THE PROTECTION SIGNS AGAINST COPIES NOT EFFECTIVE TO PREVENT AN VCR FROM MAKING UNAUTHORIZED COPIES. THE APPLIANCE INCLUDES A SYNCHRONISM SEPARATOR (44) TO DETECT THE VERTICAL EXTINGUISHING INTERVAL, IMPULSE GENERATING CIRCUITS (58, 60, 62, 72, 74) TO PRODUCE IMPULSES WITH A DEFAULT DURATION DURING THIS INTERVAL AND A CIRCULATION OF 88 90, 92) TO ADD THE DEFAULT PULSES AND THE SIGNS OF PROTECTION AGAINST COPIES TO MOVE YOUR LEVEL. AN ALTERNATIVE METHOD INCREASES THE EFFECTIVE FREQUENCY OF THE PROTECTION SIGNALS AGAINST COPIES DURING THE VERTICAL EXTINCTION INTERVAL TO OBTAIN A LOW-STEP ATTENUATION AND / OR FILTERING IN THE VCR CIRCUIT, SO THAT THE SIGNALS ARE NOT IMPACTED. COPY.