AGC circuit eliminating influence of audio intermediate frequency signals

摘要

The present invention provides an AGC circuit for performing a positive AGC on the basis of the picture intermediate frequency signals, with signal level controller means (1) receiving intermediate frequency signals of television and AGC voltage for outputting the intermediate frequency signals of which the level is modified by the AGC voltage; filter means (2) for extracting picture intermediate frequency signals in the intermediate frequency signals output from the signal level controller means; and detector means (7) for detecting the extracted picture intermediate frequency signals for outputting direct current voltage proportional to the level of the intermediate frequency signals input to the level controller means (1) in which the direct current voltage is input to the level controller means for the AGC voltage.