PURPOSE: To improve accuracy for adding pedestal level data to a video signal being one of digital processing in the case of digitally processing the video signal in an NTSC system or the like.

CONSTITUTION: After pedestal level clamp processing at a clamp circuit 32, an analog video signal 31 is converted into a digital signal by an A/D conversion circuit 33. A pedestal level extraction circuit 1 extracts only the pedestal level data from the output of this A/D conversion circuit 33. Even when the A/D converted output is fluctuated, these extracted data follows up the fluctuation. Therefore, when these extracted data are added to the video signal after digital processing at a digital processing part 34 similar to the conventional one by a pedestal level adding circuit 36 similar to the conventional configuration, exact pedestal level addition can be provided.