Data modulation/demodulation system utilizing demodulation clock

Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking

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360 40, 360 53, G11B 2010, G06F 1100

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active

048689220

ABSTRACT:
A data modulation/demodulation system reproducing data that is divided and recorded in a plurality of blocks on a recording medium. The data modulation/demodulation system utilizes the steps of modulating the data by adding specified data bit patterns to the data bits of each block and reproducing the data which have been obtained by adding specified code bit patterns. The bit rows are independently demodulated by demodulation clocks which differ in phase. The demodulation bit pattern of the above code bit pattern which was added at the time of recording and the bit pattern which was demodulated by the different modulation clocks are compared with each other to determine which data is wrong. The correct demodulated data is selected according to this comparison and transmitted.

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