Patent ID: 6422467
Filing Date: 2002-07-23
Classification: G02B,G06K,G07F,G07G

Abstract:
A laser scanning system comprising:a laser scanning mechanism for producing a laser scanning beam within a plurality of predefined focal zones and scanning said laser beam over a bar code symbol, and automatically producing an analog scan data signal indicative of the intensity of light reflected from said scanned bar code symbol; and a scan data signal processor for processing said analog scan data signal, said scan data signal processor including a plurality of different pass-band filters, wherein one of said pass-band filters is dynamically switched into operation for pass-band filtering the analog scan data signal produced by said laser scanning beam scanning a bar code symbol within one of said predefined focal zones so as to filter out spectral components of paper noise residing outside the frequency spectrum of said analog scan data signal produced in response to scanning said bar code symbol within said predefined focal zone.