OPTICAL CHARACTER RECOGNITION VIDEO AMPLIFIER AND DIGITIZER

摘要

A video amplifier and digitizer for use in combination with an array of photoconductive diodes for optical sensing in optical character recognition equipment. The video amplifier includes a noise filter and provides high gain for the signals from the diode array. The digitizer includes circuits for storing the peak "black" and "white" levels of the analog video signal and a comparison circuit for comparing the analog video signal with a threshold between the stored "black" and "white" levels to produce a digitized video output signal.