| 摘要 |
PURPOSE:To easily and precisely remove a low frequency component included in a reproducing signal by a differentiation operation and to obtain reproducing data with high accuracy from which noise is removed, by generating a gate pulse by using the reproducing signal on which secondary differentiation is applied. CONSTITUTION:A gate pulse generation circuit 40 is constituted of at least a comparator 41 which slices a differentiation signal 30S with a prescribed level and outputs a pulse, and a delay means 42 which outputs the gate pulse by delaying the output pulse of the comparator. In other words, a differentiator 30 functions so as to remove the low frequency component included in the reproducing signal Si, and the comparator 41 in the gate pulse generation circuit 40 generates the pulse by slicing the differentiation signal 30S outputted from the differentiator at the front stage of the circuit with the prescribed level, and functions so as to remove the noise included in the reproducing signal by the pulse. Also, the delay means 42 delays the output pulse of the comparator 41 and outputs the gate pulse, and supplies it to an AND circuit. In such a way, it is possible to make a circuit to remove the low frequency component due to alternate AC coupling unnecessary, and to remove a problem in the AC coupling.
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