| 摘要 |
PURPOSE:To simplify the titled device and to lower its cost by applying all-wave rectification to an analog signal corresponding to previously written information in two recording areas on a track obtained through a head, and detecting the radial direction position to the track of the head based on a wave height in a corresponding section of the respective recording areas of the all-wave rectifying signal. CONSTITUTION:In a reading system, a magnetic head 3 on a magnetic disk 2 rotating by a DC motor 1 is moved to a predetermined track position by driving a stepping motor 4 based on a seek instruction from a host device. When the magnetic head 3 reaches to a predetermined track position, an analog signal corresponding to an information recorded in the track through the magnetic head 3 and a head driving circuit 5 is outputted. This analog signal passes through a filter 6, respective processings of a differentiating circuit 7 and an amplifying circuit 8 and is converted into a rectangular pulse by a pulse shaper 9. Further, in a rear stage, based on the rectangular pulse from this pulse shaper 9, such a processing is done that an information recorded in the track is decoded.
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