Video signal binary circuit in photoelectric conversion system

Abstract

Abstract PURPOSE:To prevent a white part in a black picture to obtain accurate picture information, by inhibiting a down clock, which lowers the peak value of a video signal, when this peak value is lowered to a certain voltage level. CONSTITUTION:The peak value level from an output terminal of a video signal binary LSI 21 is inputted to the - terminal of a comparator 22, and a level voltage divided by resistances is inputted to the + terminal. When the peak value voltage is lower than the comparison voltage, the comparator 22 outputs an H- level output to the output terminal. The output of the comparator 22 is inputted to one input of an OR circuit 23, and a down clock signal is inputted to the other input to inhibit the down clock for the H-level output of the comparator 22. Thus, the peak value is prevented from being lowered more than the comparison voltage to secure the black picture.

Inventors

• 👤 Hiromitsu Momoki
• 👤 Yasuo Inoue
• 👤 Takahisa Ikeda

Bibliographic Details