METHOD OF MODULATING DIGITAL DATA

Title:

METHOD OF MODULATING DIGITAL DATA

Document Type and Number:

WIPO Patent Application WO/1985/000067

Kind Code:

A1

Abstract:

In a method of modulating a data bit series consisting of a first value (e.g., 1) and a second value (e.g., 0), inversion is used as a condition transition so that the following conditions (a) to (d) are satisfied: (a) inversion occurs at the boundary between bit cells sandwiched between "0" bits; (b) inversion occurs at the center of a bit cell containing a "1" bit; (c) inversion is prevented at the center of each of the last two bit cells containing "1" bits of an even number of bit cells containing "1" bits sandwiched between "0" bits, but inversion occurs at the boundary between these last two bit cells containing "1" bits; and (d) when at least one pattern of which the two bits are "0" and "1" occurs next to an even number of "1" bits after a "0" bit, inversion occurs at the center of the bit cell containing the "0" bit of the first two bits.

Inventors:

TANAKA MASATO (JP)
HIMENO TAKUJI (JP)

Application Number:

PCT/JP1984/000312

Publication Date:

January 03, 1985

Filing Date:

June 15, 1984

Export Citation:

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Assignee:

SONY CORP (JP)

International Classes:

H03M5/04; G11B20/14; H03M5/14; H04L25/49; (IPC1-7): G11B5/09; H04L25/49

Foreign References:

JPS5690407A	1981-07-22
JPS56160164A	1981-12-09
JPS5727412A	1982-02-13
JPS5728456A	1982-02-16

Other References: