JPH02880U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention;
3 is a waveform diagram of the reproduced luminance signal, FIG. 3 is a color burst signal and limiter output waveform diagram, FIG. 4 is a block diagram of the conventional example, and FIG. 5 is a signal waveform diagram for explaining the operation of the conventional example. 4... Burst extraction circuit, 6... Phase comparator,
7... First mono-multivibrator (first burst gate pulse output circuit), 8... Second burst gate pulse output circuit, 9, 10... First, second burst circuit, 15, 16... First, second smoothing circuit , 17
...Differential amplifier.

Claims (1)

[Claims for Utility Model Registration] In a burst extraction circuit that extracts a color burst signal included in a reproduced carrier color signal and supplies it to a phase comparator, the color burst signal is extracted at a timing delayed by a certain period of time from the input of a reproduced horizontal synchronization signal. a first burst gate pulse output circuit that outputs a first burst gate pulse having a wide enough pulse width to extract the first burst gate pulse; a second burst gate pulse output circuit that outputs a second burst gate pulse having a pulse width narrower than the burst gate pulse; and a first burst gate that extracts a portion corresponding to the period of the first burst gate pulse from the reproduced carrier color signal. a second burst gate circuit for extracting a portion corresponding to the period of the second burst gate pulse from the reproduced carrier color signal; first and second smoothing circuits for smoothing the outputs of each of the burst gate circuits, respectively; , a differential circuit that provides differential outputs of both the smoothing circuits, and controlling the phase of the second burst gate pulse based on the differential output.