JPS5785140A - Compressing system of data - Google Patents

Compressing system of data

Info

Publication number
JPS5785140A
JPS5785140A JP55160111A JP16011180A JPS5785140A JP S5785140 A JPS5785140 A JP S5785140A JP 55160111 A JP55160111 A JP 55160111A JP 16011180 A JP16011180 A JP 16011180A JP S5785140 A JPS5785140 A JP S5785140A
Authority
JP
Japan
Prior art keywords
code
register
variable length
length code
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
JP55160111A
Other languages
Japanese (ja)
Other versions
JPS6014374B2 (en
Inventor
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 JP55160111A priority Critical patent/JPS6014374B2/en
Publication of JPS5785140A publication Critical patent/JPS5785140A/en
Publication of JPS6014374B2 publication Critical patent/JPS6014374B2/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
    • H03M7/40—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code
    • H03M7/42—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code using table look-up for the coding or decoding process, e.g. using read-only memory

Abstract

PURPOSE:To obtain a code conversion table of small size, by assigning a different variable length code to each fixed length code, properly using plural code conversion tables, and converting a code. CONSTITUTION:A fixed length code is inputted in order by 1 character each to an input register 7 from an input data group 1. Entry addresses of a code conversion table 7 or 8 are derived simultaneously from the first and second byte values of the register 7, respectively. A variable length code 10 and code length 11 of the variable length code being contents of a table designated by these entry addresses are stored simultaneously in an output register 12 and 13 of the code conversion table. A code assembling circuit 14 refers to the register 12 and 13, assembles a variable length code combining the variable length code indicated by the register 13, just behind the variable length code indicated by the register 12, and outputs it to an output register 15. The variable length code outputted to the register 15 is transferred in order to an output data group 2.
JP55160111A 1980-11-15 1980-11-15 Data compression method Expired JPS6014374B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55160111A JPS6014374B2 (en) 1980-11-15 1980-11-15 Data compression method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55160111A JPS6014374B2 (en) 1980-11-15 1980-11-15 Data compression method

Publications (2)

Publication Number Publication Date
JPS5785140A true JPS5785140A (en) 1982-05-27
JPS6014374B2 JPS6014374B2 (en) 1985-04-12

Family

ID=15708086

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55160111A Expired JPS6014374B2 (en) 1980-11-15 1980-11-15 Data compression method

Country Status (1)

Country Link
JP (1) JPS6014374B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63173930U (en) * 1987-04-28 1988-11-11
JPH0383123A (en) * 1989-08-28 1991-04-09 Sumitomo Metal Ind Ltd Method for compressing measured data

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63173930U (en) * 1987-04-28 1988-11-11
JPH0383123A (en) * 1989-08-28 1991-04-09 Sumitomo Metal Ind Ltd Method for compressing measured data

Also Published As

Publication number Publication date
JPS6014374B2 (en) 1985-04-12

Similar Documents

Publication Publication Date Title
EP0372566A3 (en) Reciprocal arithmetic circuit with rom table
JPS5421152A (en) Comparison circuit
EP0606161A3 (en) Circuit for converting unipolar input to bipolar output.
AU5188079A (en) Allocating and resolving next virtual pages for input/output
EP0122016A3 (en) New and improved shifter circuit
JPS5785140A (en) Compressing system of data
HK57986A (en) Circuit for converting an input d.c.voltage into an output d.c.voltage
JPS56123037A (en) Code conversion system
JPS55102034A (en) Set unit for unit address
JPS53107259A (en) Compensator for delay of envelope
JPS554605A (en) Address decoding system
JPS5534722A (en) Function generator
JPS56123036A (en) Code conversion system
JPS57162883A (en) Image data converter
JPS5713542A (en) Data speed transducer
JPS5438732A (en) Input/output order accepting system
JPS6449428A (en) Digital/digital code converter
JPS5478940A (en) Code conversion system
JPS5595155A (en) Operation check system for counter
JPS6473911A (en) Digital filter
SU484520A1 (en) Device for adding numbers in the system of residual classes
JPS52144922A (en) Numeric input unit
JPS6459553A (en) Address conversion circuit
JPS56101249A (en) Addition and subtraction system of pcm signal
JPS6486625A (en) Hexadecimal converter