INFORMATION REPRODUCING DEVICE

摘要

When, from an information signal (26) including alternating pulses of positive and negative polarities and of multiple kinds of pulse spacing, channel data (28) on a bit stream corresponding to the pulse spacings is reproduced, a detecting gate (19) and a decoder (20) detect the ideal waveform most approximate to the pulse waveform or pulse spacing of the information signal based on the difference between the quantized data quantized by an ADC (18) and ideal waveform information with respect to the positive- and negative-polarity pulses. That is, the pulse spacings of the alternating pulses in the information signal are detected by selecting the ideal waveform most approximate to the waveform of the information signal. Bit streams conforming to the detected ideal waveform are sequentially converted into a predetermined format and outputted as channel data. Therefore, detecting the peak of the information signal is not required. Further no PLL circuit for reproducing a synchronizing clock from the information signal (26) is required. Thus, any burst error caused by an increase in recording density and track density of a magnetic disk and an increase in data transfer rate due to high speed access is prevented.