JPS5730453A - Variable-length code transmission system - Google Patents

Variable-length code transmission system

Info

Publication number
JPS5730453A
JPS5730453A JP10549980A JP10549980A JPS5730453A JP S5730453 A JPS5730453 A JP S5730453A JP 10549980 A JP10549980 A JP 10549980A JP 10549980 A JP10549980 A JP 10549980A JP S5730453 A JPS5730453 A JP S5730453A
Authority
JP
Japan
Prior art keywords
variable
register
length code
bits
length
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.)
Pending
Application number
JP10549980A
Other languages
Japanese (ja)
Inventor
Kengo Fujita
Kiichi Matsuda
Makoto Hiraoka
Toshihiro Honma
Yutaka Fukuda
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP10549980A priority Critical patent/JPS5730453A/en
Publication of JPS5730453A publication Critical patent/JPS5730453A/en
Pending 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
    • H03M7/425—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 for the decoding process only

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

PURPOSE:To convert a variable-length code into a fixed-length one by self-synchronization by detecting boundaries between variable-length codes in reception, by making each variable-length code has the same bit as the 1st and last bits and no bit of the same kind as the 1st and last bits as other bits. CONSTITUTION:A variable-length code consisting of eight bits at a maximum is inputted to a shift register successively as input data and when contents 00 of bits b0 and b1 are set in sections 3-7 and 3-8 of the register 3, a detecting circuit 4 for boundaries between variable-length codes sends it output to a register 5. Then, the data 0 in the section 3-7 of the register 3 is transferred to the register 5, and an ROM for variable-length/fixed-length code conversion outputs a fixed-length code 0000 which corresponds to a [0]. The register 5 sends an ineffective signal to the register 3 to make the data in the section 3-7 ineffective. As the next data, bits b2-b8 are inputted to the register 3 and when a bit b9 is inputted, the circuit 4 generates an output and a fixed-length code is outputted similarly.
JP10549980A 1980-07-31 1980-07-31 Variable-length code transmission system Pending JPS5730453A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10549980A JPS5730453A (en) 1980-07-31 1980-07-31 Variable-length code transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10549980A JPS5730453A (en) 1980-07-31 1980-07-31 Variable-length code transmission system

Publications (1)

Publication Number Publication Date
JPS5730453A true JPS5730453A (en) 1982-02-18

Family

ID=14409287

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10549980A Pending JPS5730453A (en) 1980-07-31 1980-07-31 Variable-length code transmission system

Country Status (1)

Country Link
JP (1) JPS5730453A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6096046A (en) * 1983-10-05 1985-05-29 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Digital communicatio system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6096046A (en) * 1983-10-05 1985-05-29 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Digital communicatio system

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