A/D CONVERSION CIRCUIT FOR TELEVISION SIGNAL

摘要

PURPOSE:To prevent an interface line between an analog processing part and a digital processing part from increasing and to facilitate the design of a circuit as against a clamping characteristic by reduction-correcting a difference between the pedestal level value of an input television signal and a prescribed pedestal level value in a digital processing after A/D conversion. CONSTITUTION:An error correction circuit 18 is connected between an A/D converter 12 and a filter circuit 14 and a part of an output from the A/D converter 12 is fetched from the output-side of the A/D converter 12 as a digital clamping circuit by which an error is corrected on the output-side of the A/D converter 12. Consequently, the difference between the pedestal level value of the input television signal and the prescribed pedestal level value is reduction- corrected by the digital processing after A/D conversion without feeding it back to the analog processing part before A/D conversion. Thus, the interface line between the analog processing part and the digital processing part is prevented from increasing and circuit design against the clamping characteristic can be facilitated.