Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Edward Barkan1
Date of Patent
September 30, 2008
1Patent Application Number
115412561
Date Filed
September 29, 2006
1Patent Primary Examiner
Patent abstract
A MEMS-based reader has an extended range of working distances for reading bar code symbols. A digitizer resolves the edges of bar code symbols when located at far-away distances from the reader within the working range. The digitizer includes a differentiator for differentiating the analog signal to generate a first derivative signal, a peak detector for detecting voltage peaks in the first derivative signal, and a comparator for comparing voltage drops after the voltage peaks with a predetermined voltage value, and for determining the presence of each edge when each voltage drop at least equals, and preferably exceeds, the predetermined voltage value.
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