Apparatus for transmission of chrominance signals during blanking period

A color television signal processing circuit for reproducing a chrominance signal from a color television signal in which the chrominance signal compressed in time scale is superposed on the horizontal flyback blanking time portion of the color television signal along with a reference signal superimposed on the horizontal synchronizing signal and synchronized with the clock signal used for compressing the chrominance signal, which comprises:

• first circuit means responsive to said color television signal for producing a reference reset pulse and a sample pulse derived from said reference signal superimposed on said horizontal synchronizing signal;
• second circuit means driven by said sample pulse for producing a high frequency pulse and a low frequency pulse synchronized with said reference reset pulse;
• clock pulse generator means capable of being synchronized in response to an external signal for producing a time expansion clock pulse and a comparison reset pulse in response to the output of said second circuit means;
• and
• reset pulse judgment circuit means responsive to said reference reset pulse and said comparison reset pulse for producing said reference reset pulse as a reference pulse to synchronize said clock pulse generator means when the reference reset pulse and the comparison reset pulse are coincident in phase and for producing said comparison reset pulse as a reference pulse to synchronize said clock pulse generator means when the reference reset pulse and the comparison reset pulse are not coincident in phase.