JPS564960A - Coding circuit - Google Patents

Coding circuit

Info

Publication number
JPS564960A
JPS564960A JP8092879A JP8092879A JPS564960A JP S564960 A JPS564960 A JP S564960A JP 8092879 A JP8092879 A JP 8092879A JP 8092879 A JP8092879 A JP 8092879A JP S564960 A JPS564960 A JP S564960A
Authority
JP
Japan
Prior art keywords
code
memory
length
bits
memories
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
JP8092879A
Other languages
Japanese (ja)
Other versions
JPS6148305B2 (en
Inventor
Masami Suzuki
Masamichi Kawakami
Hiroyuki Hayazaki
Noriyoshi Ogata
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP8092879A priority Critical patent/JPS564960A/en
Publication of JPS564960A publication Critical patent/JPS564960A/en
Publication of JPS6148305B2 publication Critical patent/JPS6148305B2/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)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

PURPOSE:To make it possible to use a memory of relatively small capacity and to reduce the number of memories by storing each memory with a code of lower N bits of each coded signal and its code length corresponding to the number of run length. CONSTITUTION:The special code constitution of an MH(modified Hoffman) is effectively utilized here. Then, the 1st memory 5 is stored previously with a code of eight low-order bits of each MH code equivalent to the number of fun length that address signals A5-A0 express, and the 2nd memory 6 with a binary code expressing the code length (number of bits) of each MH code. Memories 5 and 6 are so constituted that a white or black MH code when address signal A6 shows ''0'' or ''1'' respectively will be read out and a make-up code when address signal A7 shows ''0'' will be read out. Therefore, a coding memory can use that of small bit memory capacity.
JP8092879A 1979-06-26 1979-06-26 Coding circuit Granted JPS564960A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8092879A JPS564960A (en) 1979-06-26 1979-06-26 Coding circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8092879A JPS564960A (en) 1979-06-26 1979-06-26 Coding circuit

Publications (2)

Publication Number Publication Date
JPS564960A true JPS564960A (en) 1981-01-19
JPS6148305B2 JPS6148305B2 (en) 1986-10-23

Family

ID=13732090

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8092879A Granted JPS564960A (en) 1979-06-26 1979-06-26 Coding circuit

Country Status (1)

Country Link
JP (1) JPS564960A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57140068A (en) * 1981-02-23 1982-08-30 Hitachi Ltd Mh code transmission system
JPS595780A (en) * 1982-06-30 1984-01-12 Mitsubishi Electric Corp Run-length encoding device
JPH0398384A (en) * 1989-09-11 1991-04-23 Nec Corp Facsimile coder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57140068A (en) * 1981-02-23 1982-08-30 Hitachi Ltd Mh code transmission system
JPS595780A (en) * 1982-06-30 1984-01-12 Mitsubishi Electric Corp Run-length encoding device
JPH0398384A (en) * 1989-09-11 1991-04-23 Nec Corp Facsimile coder

Also Published As

Publication number Publication date
JPS6148305B2 (en) 1986-10-23

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