CIRCUIT FOR CORRECTING PHASE DEVIATIONS BETWEEN THE LINE DEFLECTION DRIVE SIGNALS AND THE LINE SYNCHRONISING SIGNALS IN A TELEVISION RECEIVER

摘要

PHF. 80-502 -20-ABSTRACTThis circuit comprises a phase comparison stageand a synchronising control stage. The phase comparisonstage includes a reference oscillator, a frequencydivider connected to the output of the oscillator andwhose output signals constitute the useful line deflectiondrive signals, as well as a phase comparator comprising alogic circuit and a counter. The logic circuit receivessynchronising signals and the counter, which is connectedto the output of the oscillator produces a signal which isrepresentative of the phase deviation detected in controlstage, the latter comprising a state detector for detect-ing the synchronised state, in which the phase deviationdetected is below a limit value or the unsynchronisedstate division ratio of the frequency divider. This fre-quency divider comprises a counter, an adder, and adecoder the output signal of which is stabilised by meansof a stabilising stage. The circuit consists for themajor part of digital circuits.