| 摘要 |
PURPOSE:To obtain a reproducing circuit of a digital recording signal, which is capable of stably operating extending from a detector to an input of a digital signal processing circuit, by inserting a filter for cutting off a high band, between an output of the detector and a voltage comparator. CONSTITUTION:A titled circuit is constituted of a low-pass filter 13, a resistance 14, a capacitance 15, etc. As for a signal obtained by a detector 1, a signal except a necessary signal band is cut off by the low-pass filter 13, and is applied to a voltage comparator 2. As a result, a higher harmonic portion, etc. of a square wave which becomes an input signal of a digital signal processing circuit 3 is attenuated, therefore, even if it is returned to such a circuit of a low signal level as the detector 1, no oscillation is generated. Also, deterioration of the error rate is improved. Accordingly, in this way, it is possible to obtain a reproducing circuit of a digital recording signal, which is capable of operating stably. |
