| 摘要 |
An adaptive system and a method for reading bar code symbols or the like, including a scanner for generating a light beam directed toward a target, the light beam sweeping the symbol to be read. The system further includes a photodetector for receiving reflected light from such symbol, and circuitry to determine whether the signal received is sufficiently distinct to determine that a valid symbol has been scanned, and signal processing circuitry having adjustable gain, bandwidth, and digitizer threshold characteristics for processing such signals.
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