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JPS57139859A - Error correction system - Google Patents

Error correction system

Info

Publication number
JPS57139859A
JPS57139859A JP56025787A JP2578781A JPS57139859A JP S57139859 A JPS57139859 A JP S57139859A JP 56025787 A JP56025787 A JP 56025787A JP 2578781 A JP2578781 A JP 2578781A JP S57139859 A JPS57139859 A JP S57139859A
Authority
JP
Japan
Prior art keywords
bit
error
circuit
bits
matrix
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP56025787A
Other languages
Japanese (ja)
Other versions
JPS617654B2 (en
Inventor
Tsutomu Yokoi
Takashi Tabei
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP56025787A priority Critical patent/JPS57139859A/en
Publication of JPS57139859A publication Critical patent/JPS57139859A/en
Publication of JPS617654B2 publication Critical patent/JPS617654B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
    • H03M13/13—Linear codes

Landscapes

  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Detection And Correction Of Errors (AREA)

Abstract

PURPOSE:To improve detection rate of the error of plural bits without increasing a check bit, by detecting an error of 3 bits or more against the row direction of a fundamental matrix of 4 bits, and also making it the same circuit in byte unit. CONSTITUTION:A check bit 4 is generated against a data bit 2 in accordance with a check bit matrix which is not shown in the figure, by an additional circuit 3, and is written in a storage device 1 together with the bit 2. Subsequently, a data bit 5 and a check bit 6 are read out from the device 1, and a check bit 8 is generated in accordance with the matrix by an additional circuit 7 from the bit 5. Subsequently, it is compared 9 with the bit 6, and generates a syndrome 10. An error detecting circuit 11 decodes an error position in accordance with the matrix and sends its result 12 to a correcting circuit 13. As sor a read-out information 14 corrected by the circuit 13, an error of 1 bit is corrected and also an error of 2 bits or more in the 4 bit block is detected, as well.
JP56025787A 1981-02-23 1981-02-23 Error correction system Granted JPS57139859A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56025787A JPS57139859A (en) 1981-02-23 1981-02-23 Error correction system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56025787A JPS57139859A (en) 1981-02-23 1981-02-23 Error correction system

Publications (2)

Publication Number Publication Date
JPS57139859A true JPS57139859A (en) 1982-08-30
JPS617654B2 JPS617654B2 (en) 1986-03-07

Family

ID=12175535

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56025787A Granted JPS57139859A (en) 1981-02-23 1981-02-23 Error correction system

Country Status (1)

Country Link
JP (1) JPS57139859A (en)

Also Published As

Publication number Publication date
JPS617654B2 (en) 1986-03-07

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