TIME AXIS ERROR CORRECTION CIRCUIT

摘要

PURPOSE:To simplify the titled circuit by providing a phase comparison means for comparing the position of an output of a variable phase shift means and the phase of a burst signal in a reproduced video signal to eliminate the need for a variable frequency crystal oscillator from a circuit obtaining an error signal. CONSTITUTION:A burst gate circuit 16 outputs only a burst in a reproduced video signal. On the other hand, a reference signal having the same frequency as that of a burst signal is outputted from a frequency division circuit 2 and inputted to a variable phase shift circuit 17. The output of the variable phase shift circuit 17 is inputted to a phase comparator circuit 18, where the phase is compared with that of the burst signal. A phase error signal from the circuit 18 is inputted to the 1st low-pass filter 19. The 2nd low-pass filter 20 has a higher cut-off frequency than that of the 1st low-pass filter 19. The signal passing through the 2nd low-pass filter 20 in the variable delay circuit 21 is subjected to variation of its delay time.