公开(公告)号：CA1078062A

公开(公告)日：1980-05-20

申请号：CA247887

申请日：1976-03-15

Applicant: SERVO CORP OF AMERICA

Inventor： REISS CHARLES ,  ZUCKERMAN LEONARD

IPC: B61L25/04 ,  G06K7/10

Abstract: PULSE WIDTH DETECTION CIRCUIT FOR ELECTRO-OPTICAL LABEL READING SYSTEM A circuit for producing an output pulse of predetermined amplitude and a width equal to the mid amplitude width of an input pulse from an electro-optical label reading system is provided. The present circuit comprises delay line means having a first output terminal and a second output terminal with the signal at the second output terminal being delayed twice the time of the delay at the first terminal. The first output terminal of the delay line is connected to an amplifier operative to double the amplitude of the signal applied thereto. The output of the amplifier is connected to one input of each of first and second comparators with the other input to the comparators respectively connected to the input signal source and the second terminal of the delay line. The output of the comparators is connected to the input to an AND gate with the output from the AND gate providing the desired pulse width information.