| 摘要 |
In the data retrieval system utilizing a recording medium with digital data encoded in accordance with a modified frequency modulation (MFM) encoding scheme, an encoded data detection method and apparatus utilizes an assymetrical data window, the longer time period window for the binary "one" information, to retrieve the recorded data. The length of this longer time period window and its occurrence in time is selectively adjusted until a minimum error ratio for the recovery process is obtained. The MFM encoded data, recovered from the recording medium is detected by the skewable assymetrical data windows, the detected data converted to NRZ encoded digital data to be supplied to an NRZ discrimination circuit and then to a utilization circuit.
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