PURPOSE: To reduce the scale of the circuit constitution of a circulating-type digital filter by decreasing the number of input bits, reducing the scale of the circuit constitution of a noncirculating-type digital filter, and changing constituent elements of a circuit.
CONSTITUTION: An analog high-pass filter 2 attenuates a low-frequency component of a reproduced code-modulated signal. And, an A/D converter 4 converts the code modulated signal whose low-frequency component is attenuated, into a digital signal. This digital signal is led to the noncirculating-type digital filter 5 immediately and reproduced waveform equalization is performed. Then the circulating-type digital filter 6 corrects the attenuation of the low-frequency component by the analog high-pass filter 2.
HARADA TOSHIAKI
YAMAWAKI CHIAKI
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