JPS562766A - Data transfer system - Google Patents

Data transfer system

Info

Publication number
JPS562766A
JPS562766A JP7820979A JP7820979A JPS562766A JP S562766 A JPS562766 A JP S562766A JP 7820979 A JP7820979 A JP 7820979A JP 7820979 A JP7820979 A JP 7820979A JP S562766 A JPS562766 A JP S562766A
Authority
JP
Japan
Prior art keywords
data
circuit
case
transfer
held
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
JP7820979A
Other languages
Japanese (ja)
Other versions
JPS5953739B2 (en
Inventor
Ken Shimotsuma
Hisahiro Fujisawa
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 JP7820979A priority Critical patent/JPS5953739B2/en
Publication of JPS562766A publication Critical patent/JPS562766A/en
Publication of JPS5953739B2 publication Critical patent/JPS5953739B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/46—Conversion to or from run-length codes, i.e. by representing the number of consecutive digits, or groups of digits, of the same kind by a code word and a digit indicative of that kind

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Information Transfer Systems (AREA)

Abstract

PURPOSE:To improve data transfer efficiency and reduce the occupation time of transfer lines and so on, by compacting and transmitting data in case that data of the same contents is continuous. CONSTITUTION:Data transfer control unit 1 is constituted by four blocks of input data deciding part 100, frequency counting part 200, frequency comparing part 300, and data transmission selecting part 400, and before data transfer, data transfer start line 4 is set to ''1'' and required circuits of deciding part 100 and counting part 200 are initialized. Data given to data input line 2 is held in data holding circuits 101-103, and preceding data held in circuit 102 and the output of circuit 101 are compared with each other by comparing circuit 104, and data is held in circuit 102 in case of agreement between them, but counting part 200 and comparing part 300 are initialized in case of disagreement. Then, in case that data of the same contents is continuous, data is counted by counting part 200, and data on data output line 3 transmitted from selecting part 400 is compacted, thus improving data transmission efficiency and reducing the occupation time of transfer lines and so on.
JP7820979A 1979-06-22 1979-06-22 Data transfer method Expired JPS5953739B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7820979A JPS5953739B2 (en) 1979-06-22 1979-06-22 Data transfer method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7820979A JPS5953739B2 (en) 1979-06-22 1979-06-22 Data transfer method

Publications (2)

Publication Number Publication Date
JPS562766A true JPS562766A (en) 1981-01-13
JPS5953739B2 JPS5953739B2 (en) 1984-12-26

Family

ID=13655644

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7820979A Expired JPS5953739B2 (en) 1979-06-22 1979-06-22 Data transfer method

Country Status (1)

Country Link
JP (1) JPS5953739B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01125028A (en) * 1987-02-24 1989-05-17 Hayes Microcomputer Prod Inc Method and apparatus for compression of compatible data
JP2008204129A (en) * 2007-02-20 2008-09-04 Nec Computertechno Ltd Data transfer apparatus and data transfer method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01125028A (en) * 1987-02-24 1989-05-17 Hayes Microcomputer Prod Inc Method and apparatus for compression of compatible data
JP2008204129A (en) * 2007-02-20 2008-09-04 Nec Computertechno Ltd Data transfer apparatus and data transfer method

Also Published As

Publication number Publication date
JPS5953739B2 (en) 1984-12-26

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