A method and a structure are provided to detect phase errors in horizontal synchronization pulses of video signals. A detected phase error is used to provide a phase correction for each horizontal line of the video image. In one embodiment, the phase correction is provided by a digital filter which takes into account systematic and random components of the phase error. In addition, the phase correction also takes into account accumulated round-off errors in the digital filter itself. A random number generator in the digital filter randomizes the correction for accumulated round-off errors. The phase correction is made smaller than the phase error so as to prevent jittering in the resulting picture.
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