R&D Report 1973-01 : Digital video: Effect of PAL decoder alignment on the acceptable limits for timing jitter.
V.G. Devereux, G.C. Wilkinson
Tests have been performed to investigate the effect of alignment errors in PAL decoders on the acceptable limits for timing jitter in the decoded samples from a pulse modulation (PCM) system carrying 625-line PAL colour television signals. It is shown that certain alignment errors in the PAL decoder such as incorrect adjustment of the static phase of the reference subcarrier, can considerably increase the impairment caused by timing jitter. Limits have been obtained for the amount of timing jitter which can be tolerated in a broadcast-quality television system allowing for a tolerance of +/- 15 degrees on the static phase adjustment.

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