JPS57120154A - Sequential variable length coding system - Google Patents

Sequential variable length coding system

Info

Publication number
JPS57120154A
JPS57120154A JP495781A JP495781A JPS57120154A JP S57120154 A JPS57120154 A JP S57120154A JP 495781 A JP495781 A JP 495781A JP 495781 A JP495781 A JP 495781A JP S57120154 A JPS57120154 A JP S57120154A
Authority
JP
Japan
Prior art keywords
signal
code
huffman
coding
transferred
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
JP495781A
Other languages
Japanese (ja)
Other versions
JPS6352812B2 (en
Inventor
Tsutomu Miyasato
Kazuo Yamada
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.)
KDDI Corp
Original Assignee
Kokusai Denshin Denwa KK
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 Kokusai Denshin Denwa KK filed Critical Kokusai Denshin Denwa KK
Priority to JP495781A priority Critical patent/JPS57120154A/en
Publication of JPS57120154A publication Critical patent/JPS57120154A/en
Publication of JPS6352812B2 publication Critical patent/JPS6352812B2/ja
Granted 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

PURPOSE:To obtain a high coding efficiency, by providing a learning function to secure the following to a partial change of the statistic quantity within the gathering of data and coding the information source while replacing a coding table by every proper period. CONSTITUTION:For example, a picture signal 10 applied to an input terminal 11 is converted into a digital signal by an A/D converter 1 and transferred to a Huffman coded part 2 and a distribution analyzing part 3. At said part 2 the signal 102 is coded through a coding table and transmitted to a transmission line 5. The luminance distribution of the input picture signals is calculated at the part 3 by the signal 102. The calculated luminance distribution signal 103 is transferred to a Huffman's code arithmetic part 4 to calculate a Huffman's code. This code is transferred to the part 2 to be written in place of the conventional code conversion table as a new one. In such way, the coding is carried out by means of a Huffman's code formed by the distribution of the block preceding to an input signal.
JP495781A 1981-01-19 1981-01-19 Sequential variable length coding system Granted JPS57120154A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP495781A JPS57120154A (en) 1981-01-19 1981-01-19 Sequential variable length coding system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP495781A JPS57120154A (en) 1981-01-19 1981-01-19 Sequential variable length coding system

Publications (2)

Publication Number Publication Date
JPS57120154A true JPS57120154A (en) 1982-07-27
JPS6352812B2 JPS6352812B2 (en) 1988-10-20

Family

ID=11598054

Family Applications (1)

Application Number Title Priority Date Filing Date
JP495781A Granted JPS57120154A (en) 1981-01-19 1981-01-19 Sequential variable length coding system

Country Status (1)

Country Link
JP (1) JPS57120154A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5992647A (en) * 1982-11-19 1984-05-28 Fuji Xerox Co Ltd Code transmission system
US4829526A (en) * 1985-03-04 1989-05-09 British Telecommunications Public Limited Company Data transmission
JPH03201827A (en) * 1989-12-28 1991-09-03 Mitsubishi Electric Corp Encoder/decoder
JPH06232914A (en) * 1992-12-04 1994-08-19 Internatl Business Mach Corp <Ibm> Method for compressing quasistatic data and expanding the same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH027215U (en) * 1988-06-29 1990-01-18

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49107461A (en) * 1973-02-14 1974-10-12
JPS5539956A (en) * 1978-09-14 1980-03-21 Oki Electric Ind Co Ltd Character pattern data compression method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49107461A (en) * 1973-02-14 1974-10-12
JPS5539956A (en) * 1978-09-14 1980-03-21 Oki Electric Ind Co Ltd Character pattern data compression method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5992647A (en) * 1982-11-19 1984-05-28 Fuji Xerox Co Ltd Code transmission system
US4829526A (en) * 1985-03-04 1989-05-09 British Telecommunications Public Limited Company Data transmission
JPH03201827A (en) * 1989-12-28 1991-09-03 Mitsubishi Electric Corp Encoder/decoder
JPH06232914A (en) * 1992-12-04 1994-08-19 Internatl Business Mach Corp <Ibm> Method for compressing quasistatic data and expanding the same

Also Published As

Publication number Publication date
JPS6352812B2 (en) 1988-10-20

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