Method and apparatus to reduce the effects of video copy protection signals

摘要

A method and apparatus for reducing the effects of copy protection in a video signal is disclosed. The technique generally utilizes a particular pulse position shifting of AGC, normal sync and/or pseudo sync pulses to increase the separation between the pulses. Various embodiments are disclosed to provide the selective position separation between the sync/pseudo sync and AGC pulses. The gap is produced by position separation only of the trailing edge of the sync or pseudo sync pulses and the leading edge of the respective AGC pulses and not by narrowing any of the pulses. Where the gap is of sufficient duration, say of 0.5 mu seconds to 2.0 mu seconds, the AGC of a video recorder does not respond to the pseudo sync and AGC pulses of the copy protection signal. <IMAGE>