Patent ID: 6166771
Filing Date: 2000-12-26
Classification: H04N

Abstract:
A peak hold circuit comprising:a peak detector for detecting and holding a peak value of an input signal representing an image supplied to an input;a switch coupled to said input signal of said peak detector for separating said input signal into a plurality of input sections of said image representing different sections of said image, and for selectively supplying a section from among said plurality of input sections of the input signal as a peak hold section to said peak detector; anda peak hold controller for controlling said switch to select said peak hold section causing said peak detector to detect the peak value for said peak hold section and to ignore other of said plurality of input sections of the input signal, said peak hold controller including a counter for counting a clock signal supplied thereto and outputting a count signal indicative of the peak hold section to be detected, a decoder for generating a decoded signal by decoding said count signal to output a decoded signal indicating the position of the peak hold section in the input signal, and a pulse generator responsive to said decoded signal to generate a switching pulse to activate said switch to select said peak hold section.