Bar code reader with comparison of bar widths and signal transitions

摘要: In a bar code reading device in which an image of is Converted into information signal having transitions corresponding to data the code, first counter counts numbers pulses clock provided by reference periods between signal. The pulse are stored memory. A second number and stores Since procedure carried out can occur very short time, correctly be counted even if has defective formed misprinting. Accordingly, ALU able decide whether or not recognized through comparison memory Thus, incorrect operations prevented.