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- This circuit comprises a phase comparison stage and a synchronising control stage. The phase comparison stage includes a reference oscillator, a frequency divider connected to the output of the oscillator and whose output signals constitute the useful line deflection drive signals, as well as a phase comparator comprising a logic circuit and a counter. The logic circuit receives synchronising signals and the counter, which is connected to the output of the oscillator produces a signal which is representative of the phase deviation detected in control stage, the latter comprising a state detector for detecting the synchronised state, in which the phase deviation detected is below a limit value or the unsynchronised state division ratio of the frequency divider. This frequency divider comprises a counter, an adder, and a decoder the output signal of which is stabilised by means of a stabilising stage. The circuit consists for the major part of digital circuits.