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Patent EP0177950A2 successfully refreshed from Google Patents.
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EP0177950A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

A digital information signal encoding method

Assignee: Sony Corp
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Filing: 1985-10-09
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Granted: —
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Expires: 2005-10-09
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Abstract

Abstract A method of reducing DC components in a digital information signal comprised of a plurality of 8-bit data words by converting each of the 8-bit data words to a 10-bit data word, comprises the steps of: selecting the 10-bit data words having a sequence of the logic level «1» or «0» less than two bits from both boundaries of the 10-bit data words; classifying the selected 10-bit data words into a first group consisting of 10-bit data words having five logic level «1» bits, a second group consisting of 10-bit data words having six logic level «1» bits, and a third group consisting of 10-bit data words having five logic level «1» bits, with the third group being formed by inverting the 10-bit data words in the second group; and further assigning the 8-bit words alternately to the 10-bit words in the second and third groups when such 8-bit words correspond to previously assigned 10-bit words having six logic level «1» bits and assigning the remaining 8-bit words to the 10-bit words in the first group.

Inventors

  • 👤 Seiro Taniyama

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-07 23:05
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426; G06; G06T; G06T9/00; G06T9/005; H; H03; H03M; H03M5/00; H03M5/02; H03M5/04; H03M5/14; H03M5/145

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 222 words
A method for encoding a digital information signal comprised of a plurality of N-bit data words, comprising the steps of: generating M-bit data words in which M is an even integer less than N and each of said N-bit and M-bit data words is comprised of a plurality of logic level "1" bits and logic level "0" bits; selecting said M-bit data words having a sequence of the logic level "1" or "0" less than two bits from both boundaries of said M-bit data words; classifying the selected M-bit data words into a first group consisting of said M-bit data words which have an equal number of said "1" and "0" bits, a second group consisting of said M-bit data words which have a number of said "1" bits greater than the number of said "0" bits, and a third group consisting of said M-bit data words which have a number of said "0" bits greater than the number of said "1" bits; and assigning each of said N-bit data words to at least a respective one of said M-bit data words, with some of said N-bit data words being assigned alternately to said M-bit data words of said second and third groups and the remainder of said N-bit data words being assigned to said M-bit data words of said first group.
Claim 2
Independent Claim 222 words
A method for encoding a digital information signal comprised of a plurality of N-bit data words, comprising the steps of: generating M-bit data words in which M is an even integer less than N and each of said N-bit and M-bit data words is comprised of a plurality of logic level "1" bits and logic level "0" bits; selecting said M-bit data words having a sequence of the logic level "1" or "0" less than two bits from both boundaries of said M-bit data words; classifying the selected M-bit data words into a first group consisting of said M-bit data words which have an equal number of said "1" and "0" bits, a second group consisting of said M-bit data words which have a number of said "1" bits greater than the number of said "0" bits, and a third group consisting of said M-bit data words which have a number of said "0" bits greater than the number of said "1" bits; and assigning each of said N-bit data words to at least a respective one of said M-bit data words, with some of said N-bit data words being assigned alternately to said M-bit data words of said second and third groups and the remainder of said N-bit data words being assigned to said M-bit data words of said first group.
Claim 3
Dependent Claim 35 words
A method according to claim 1, further comprising the step of selecting said M-bit data words having a sequence of the logic level "1" or "0" less than four bits within said M-bit data words.
Claim 4
Dependent Claim 38 words
A method according to claim 2, wherein said M-bit data words of one of said second and third groups are each inverted with respect to corresponding M-bit data words of the other of said second and third groups.
Claim 5
Dependent Claim 50 words
A method according to claim 3, wherein said assignment of one of said M-bit data words from one of said second and third groups results in the next M-bit data word from one of said second and third groups being assigned from the other of said second and third groups.
Claim 6
Dependent Claim 26 words
A method according to claim 4, wherein M is equal to 10 and N is equal to 8, and 256 10-bit data words are generated therefrom.
Claim 7
Dependent Claim 28 words
A method according to claim 5, wherein said first group comprises 160 M-bit data words and each of said second and third groups comprises 96 M-bit data words.

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