| 摘要 |
PURPOSE:To improve the accuracy of an identifying device for printed matters by converting the analog signal sent from a sensor into a digital signal showing its amplitude via an A/D converting means and deciding whether said amplitude is kept within an allowable range or not with comparison of the amplitude with the reference data while shifting the digital signal. CONSTITUTION:The sensors PS and MS scan the printed matters at their shift and output the analog signal to show the physical properties of the printed matters along the scanning route. A timing signal generating means E produces the timing signals at the time interval proportional to the feeding speed of the printed matters. An A/D converting means samples the analog signal in response to the timing signal and produces a series of digital sample data showing the amplitude of the analog signal. Then the reference data is shifted relatively to said sample data so that the coincidence of each reference position is secured between the sample data and the reference data. Then it is decided whether the sample data is kept within an allowable range or not in each shift state. Thus the printed matters are identified with hither accuracy. |
