| 摘要 |
A digital signal reproducing apparatus comprises a reproducing circuit for reproducing a recorded unipolar signal from a recording medium, an equalizer for subjecting the reproduced signal to a waveform equalization, a circuit for extracting a timing component having a period which is equal to one bit transmission period of the recorded unipolar signal from an output signal of the equalizer, a circuit for generating one or a plurality of clock signals which are in phase synchronism with the timing component and for forming one or a plurality of control signals by frequency-dividing the timing component by 1/2, a circuit for sampling and holding a peak value of the output signal of the equalizer for every one bit transmission period, a variable resistor for voltage-dividing the sampled and held signal to obtain a reference signal, a delay circuit for delaying the output signal of the equalizer, a comparing circuit for comparing the levels of the output signal of the delay circuit and the reference signal, and a circuit for producing a reproduced unipolar digital signal by controlling the pulse width and the pulse position of the output pulse signal of the comparing circuit by the one or a plurality of clock signals.
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