Patent ID: 6836549
Filing Date: 2004-12-28
Classification: H04N

Abstract:
A method of reducing the effects of copy protection signals in one or more selected video lines of a video signal being supplied to a recorder or television (TV) set, wherein the copy protection signals include sync and/or pseudo sync pulses together with respective automatic gain control (AGC) pulses, with the sync/pseudo pulses having a given small position separation, which can be zero separation, from the respective AGC pulses, comprising:providing the sync/pseudo sync pulses with the trailing edge thereof having the small position separation from the leading edge of respective AGC pulses, wherein the small position separation maintains the copy protection effect; and shifting the relative position of either the trailing edge of the sync/pseudo sync pulses or the leading edge of the respective AGC pulses with respect to each other, or shifting the relative positions of the trailing edge of the sync/pseudo sync pulses and the leading edge of the respective AGC pulses, to provide a modified position separation between the trailing edge of the sync/pseudo sync pulses and the leading edge of the respective AGC pulses sufficient to reduce the effects of the copy protection signals.