False bar code inhibitor circuit

摘要: A false bar code inhibitor circuit includes a detector, signal restore circuit, comparator, software controller, and high impedance clamp circuit. Basically, the detector detects first transition from either to low reflectivity or reflectivity. The triggers which is set for time constant longer than longest possible needed encounter another during valid read. Each encountered, triggered. externally adjustable comparator compares output against limit, can be adjusted by controller. of drives controls when digitizer pass an output. With controlled allowing control over generated at start scan masked. also creates 'window' used mask out signal. Additionally, allows external adjusting threshold levels