Noise-Lockout Circuit for Bar Code Scanner
Original Publication Date: 1983-Jul-01
Included in the Prior Art Database: 2005-Feb-07
This article describes an improved lockout circuit for eliminating noise voltage perturbations in an analog signal generated by a bar code scanner. The lockout circuit has a generally C-shaped characteristic. Greater noise-suppressing voltages are provided for strong "white" signals and for strong "black" signals. A lower noise-suppressing or lockout signal is generated for intermediate signals.