Patent ID: 7093763
Filing Date: 2006-08-22
Classification: G06K

Abstract:
1. A laser scanner for reading a bar code having a plurality of bar code elements, the laser scanner comprising: a) a laser generating a beam scanned over a target bar code; b) photodetector circuitry receiving light reflected from the target bar code and generating a time-varying analog signal representative of the target bar code; c) a digitizer coupled to the photodetector circuitry and receiving as an input the analog signal of the photodetector circuitry and generating: d) a decoder coupled to the digitizer, receiving the digital bar code pattern signal, determining widths of successive bar code elements of the target bar code, and decoding the target bar code, a width of a bar code element corresponding to a duration of an interval when the digital bar code pattern signal remains in a given one of the first and second states, except that when a short duration correction impulse is sensed on the digital bar code pattern signal, a state of an interval immediately prior to the impulse is interpreted by the decoder to be an opposite state of the state of the interval and a duration of the interval is added to a duration of an interval immediately preceding the interval.