JPS55143875A - Facsimile signal redundancy suppression coding system - Google Patents

Facsimile signal redundancy suppression coding system

Info

Publication number
JPS55143875A
JPS55143875A JP5141779A JP5141779A JPS55143875A JP S55143875 A JPS55143875 A JP S55143875A JP 5141779 A JP5141779 A JP 5141779A JP 5141779 A JP5141779 A JP 5141779A JP S55143875 A JPS55143875 A JP S55143875A
Authority
JP
Japan
Prior art keywords
code
information code
scanning line
overflow
original information
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
JP5141779A
Other languages
Japanese (ja)
Inventor
Toyomichi Yamada
Tetsuji Yamamoto
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 JP5141779A priority Critical patent/JPS55143875A/en
Publication of JPS55143875A publication Critical patent/JPS55143875A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/41—Bandwidth or redundancy reduction

Abstract

PURPOSE:To make coding possible with little picture quality degradation, by converting the true information code to the flag code of the original information code of the preceding scanning line to the flag code of the original information code for overflow and underflow respectively and by transmitting these converted codes. CONSTITUTION:When overflow is detected by transmission buffer memory monitor circuit 5, the signal of the scanning line writes the flag code, which indicates the same state as the original information code of the input code of the preceding scanning line where redundancy is not suppressed, in stead of the redundancy-suppressed true information code from buffer monitor circuit 5 to transmission buffer memory 4, and write from coder 3 is inhibited, thus coping with overflow. When underflow is detected, switching circuit 2 is controlled to write directly the flag code, which indicates this state, and original information code of one-scanning line components of line memory 1 to transmission buffer 4, thus increasing the information volume to cope with underflow.
JP5141779A 1979-04-27 1979-04-27 Facsimile signal redundancy suppression coding system Pending JPS55143875A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5141779A JPS55143875A (en) 1979-04-27 1979-04-27 Facsimile signal redundancy suppression coding system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5141779A JPS55143875A (en) 1979-04-27 1979-04-27 Facsimile signal redundancy suppression coding system

Publications (1)

Publication Number Publication Date
JPS55143875A true JPS55143875A (en) 1980-11-10

Family

ID=12886345

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5141779A Pending JPS55143875A (en) 1979-04-27 1979-04-27 Facsimile signal redundancy suppression coding system

Country Status (1)

Country Link
JP (1) JPS55143875A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59273A (en) * 1983-06-10 1984-01-05 Hitachi Ltd Encoding circuit of binary picture

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5123408A (en) * 1974-07-24 1976-02-25 Nippon Steel Corp KOGYOYOROHO SHUJINIOKERU RONAIKANKISOCHI
JPS5215491A (en) * 1975-07-28 1977-02-05 Kuraray Co Ltd Method for separation of air

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5123408A (en) * 1974-07-24 1976-02-25 Nippon Steel Corp KOGYOYOROHO SHUJINIOKERU RONAIKANKISOCHI
JPS5215491A (en) * 1975-07-28 1977-02-05 Kuraray Co Ltd Method for separation of air

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59273A (en) * 1983-06-10 1984-01-05 Hitachi Ltd Encoding circuit of binary picture

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