PAL System synchronizing signal generating apparatus

摘要

Synchronizing signals in a PAL system are generated without the need for an n fH oscillator by generating a reference signal having 568 cycles per line, adding a half cycle per line and then substracting one cycle per field. Pre-synchronizing signals are generated from the processed reference signal and the pre-synchronizing signals are then phase shifted by an amount which varies linearly with respect to elapsed time during each field from a value of zero to a value of substantially 1/(2 fsc).