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JPS5627444A - Data compression processing system - Google Patents

Data compression processing system

Info

Publication number
JPS5627444A
JPS5627444A JP10305879A JP10305879A JPS5627444A JP S5627444 A JPS5627444 A JP S5627444A JP 10305879 A JP10305879 A JP 10305879A JP 10305879 A JP10305879 A JP 10305879A JP S5627444 A JPS5627444 A JP S5627444A
Authority
JP
Japan
Prior art keywords
code
address
length
register
conversion table
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
JP10305879A
Other languages
Japanese (ja)
Other versions
JPS59847B2 (en
Inventor
Teizo Nagamine
Mamoru Sugiyama
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP54103058A priority Critical patent/JPS59847B2/en
Publication of JPS5627444A publication Critical patent/JPS5627444A/en
Publication of JPS59847B2 publication Critical patent/JPS59847B2/en
Expired legal-status Critical Current

Links

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  • Document Processing Apparatus (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

PURPOSE:To reduce the memory capacity required for a code conversion table by using the code conversion table for characters high in use frequency and by adding a code, belonging to a group of characters low in use frequency, to a fixed-length code. CONSTITUTION:From input data group 7 coded by two-byte fixed-length codes to input register 8, fixed-length codes are transferred and from the value of its 1st byte, the entry address of group address conversion table 11 is found to store the contents of the entry in register 14. From the value of the 2nd byte of register 8, the column address of intragroup address conversion table 16 is determined to find intragroup address 17. From this intragroup address and the group address of register 14, the entry address of code conversion table 19 is found to send variable- length code 20 and code length 21, which correspond to the fixed-length code, to output data group 25. On the other hand, characters low in frequency of use are not registered in table 19 and code composing circuit 23 adds a code, that belongs to a group of characters low in use frequency, to the contents of register 8 to compose a variable-length code, which is output.
JP54103058A 1979-08-13 1979-08-13 Data compression processing method Expired JPS59847B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54103058A JPS59847B2 (en) 1979-08-13 1979-08-13 Data compression processing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54103058A JPS59847B2 (en) 1979-08-13 1979-08-13 Data compression processing method

Publications (2)

Publication Number Publication Date
JPS5627444A true JPS5627444A (en) 1981-03-17
JPS59847B2 JPS59847B2 (en) 1984-01-09

Family

ID=14344067

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54103058A Expired JPS59847B2 (en) 1979-08-13 1979-08-13 Data compression processing method

Country Status (1)

Country Link
JP (1) JPS59847B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58107628U (en) * 1982-01-12 1983-07-22 日立工機株式会社 Data code converter
JPS61232724A (en) * 1985-04-08 1986-10-17 Nippon Denki Off Syst Kk Compressing system for character code data
JPH01101740A (en) * 1987-10-14 1989-04-19 Fujitsu Ltd System for compressing data

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61181411U (en) * 1985-04-30 1986-11-12

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58107628U (en) * 1982-01-12 1983-07-22 日立工機株式会社 Data code converter
JPS61232724A (en) * 1985-04-08 1986-10-17 Nippon Denki Off Syst Kk Compressing system for character code data
JPH01101740A (en) * 1987-10-14 1989-04-19 Fujitsu Ltd System for compressing data

Also Published As

Publication number Publication date
JPS59847B2 (en) 1984-01-09

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