| 摘要 |
<p>PURPOSE:To attenuate noise with a high frequency component and to improve bar width detecting accuracy and the reliability of reading by differentiating an input signal only once and integrating the signal in the 2nd signal processing. CONSTITUTION:The analog signal processing system is provided with a differentiating means 35, an integrating means 38, a comparing means 39, a slice signal generating means 45, a gate signal generating means 46, and an AND means 54. An analog signal including a binary code signal is differentiated only once, the differentiated signal is integrated and the changing point of the analog signal is detected by a signal outputted from the comparing means 39 for comparing the integrated signal with the differentiated signal. Since the integration can attenuate noise with a high frequency component, the bar width detecting accuracy of a bar code reader can be improved and thereby the reliability of bar code reading can be improved.</p> |
