| 摘要 |
PURPOSE:To obtain an accurate binarization signal corresponding to a bar code pattern by providing the titled circuit with a comparator for comparing the output signal of a level selecting circuit with the 1st signal outputted from a delay signal sending circuit to execute comparing processing. CONSTITUTION:An analog signal 1' inputted to terminal 1 is inputted to the delay signal sending circuit 3 and the circuit 3 outputs the 1st delay signal 2' delayed from the signal 1' by a time T and the 2nd delay signal 3' delayed by another time T. A level selecting circuit 7 divides a synthesized signal 7' by the resistance ratio of a resistor R3 to a resistor R4, compares the dividied signal 8' with a mean value signal 9', selects the signal having a higher level, and outputs a binarization decision signal 10'. The signal 10' is inputted to a comparator 8 and the circuit 8 compares the signal 2' with the signal 10' and outputs a binarization signal 11'. Even if the level of a bar signal and the level of a space signal are changed, a signal is sliced by an intermediate level between the space signal and the bar signal and an accurate binarization signal corresponding to the bar code pattern can be obtained.
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