Video signal processing circuit.

摘要

A video signal processing circuit such as a SECAM system recording circuit which suppresses the amplitude at the chroma ending starting point without arising other performance detects. In the circuit construction, a chroma signal is extracted from a composite video signal in the band pass filter 2. The chroma signal is flattened by input in the bell-shape filter 3 and amplified in limiter 4, then a down converted signal is obtained by dividing this signal to 1/4 times the frequency by input in a four divider 5. The frequency division signal is input to a gain control circuit 11. The gain control circuit 11 is undergo the gain control by the gain control signal which is composes by a timing generating circuit 12 and a time constant processing circuit 13. The gain controlled signal removes an undesired signal by passed through the band pass filter 61. The output is input to the inverse bell-shape filter 71 and an energy of a carrier signal is suppressed. The output of the inverse bell-shape filter 71 is output to an output terminal 81 as a L-SECAM chroma recording signal. <IMAGE>