A bar code decoder transforms the output from a wand scanner so that it has the same characteristics as the output from a laser scanner. Once this transformation is accomplished, decoding is done using the same process and hardware to decode wand or laser scanner data. The transformation includes scaling...http://www.google.com.au/patents/US4761544?utm_source=gb-gplus-sharePatent US4761544 - Means and method of scaling time interval measurements from an optical bar code scanner to improve decoder efficiency
