Data recording and/or reproducing method and data recording medi

Details Data recording and/or reproducing method and data recording medi Data recording and/or reproducing method and data recording medi

1989-06-21

1991-12-31

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369 32, 375 25, 375 37, 360 40, G11B 700, G11B 509, H04B 1404, H04L 2700

Patent

active

050777211

ABSTRACT:
The present invention is concerned with a method for modulating and recording data, in which the data are modulated in such a manner that m-bit data are converted into n-bit data, where m and n are real integers and m<n, p-bit merging bits are inserted between the n-bit data and the number of consecutive "0"s in the alternate concatenation of these n-bit data and p-bit merging bits is not less than a predetermined number d and not more than a number k which is larger than d, wherein the merging bits of the bit pattern consistent with a digital sum value of recording data are inserted between the n-bit data and the DSV is reset at each data block as one unit to facilitate data control for each data block as a unit. The present invention also provides a data recording medium on which are recorded data following this method. When the recording data are demodulated and reproduced from the recording medium, it is decided whether the bit pattern of the above merging bit is consistent with the modulation rule and the error detection data which deem the reproduced data in the vicinity of the merging bits not consistent with the modulation rule as being in error are outputted along with the reproduced data to improve the reliability of the reproduced data produced in the reproducing system.

REFERENCES:
patent: 4501000 (1985-02-01), Immink et al.
patent: 4551641 (1985-11-01), Ogawa et al.
patent: 4626826 (1986-12-01), Fukuda et al.
patent: 4731678 (1988-03-01), Takeuchi
patent: 4833471 (1989-03-01), Tokuume et al.

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