JPS55154876A - Facsimile signal transmission system - Google Patents

Facsimile signal transmission system

Info

Publication number
JPS55154876A
JPS55154876A JP6257679A JP6257679A JPS55154876A JP S55154876 A JPS55154876 A JP S55154876A JP 6257679 A JP6257679 A JP 6257679A JP 6257679 A JP6257679 A JP 6257679A JP S55154876 A JPS55154876 A JP S55154876A
Authority
JP
Japan
Prior art keywords
code
circuit
output
transmission
dummy
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
JP6257679A
Other languages
Japanese (ja)
Inventor
Katsuhiko Kuma
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP6257679A priority Critical patent/JPS55154876A/en
Publication of JPS55154876A publication Critical patent/JPS55154876A/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
    • H04N1/411—Bandwidth or redundancy reduction for the transmission or storage or reproduction of two-tone pictures, e.g. black and white pictures

Abstract

PURPOSE:To minimize the lowering of coding efficiency by removing a dummy code component, equivalent to the sum of the number of control code bits and that of error code bits, from a dummy code before framing. CONSTITUTION:Minimum code-length indicating circuit 9 outputs minimum code length X to comparing circuit 11. Code-length counter 10, cleared at an error detection code transmission start, starts counting the number of codes output to a transmission line. Its count value is denoted as Y. Circuit 11 outputs logic ''1'' to signal line 12 when X>Y or to signal line 13 when X<=Y. When a coder outputs a coding end signal with signal line 12 held at logic ''1'', the output dummy code transmission permit signal of AND circuit 14 is output to a dummy code generating circuit to start the transmission of a dummy code. When value Y of counter 10 becomes equal to or greater than X, the output signal of circuit 14 becomes impassive and a dummy code transmission inhibition signal, the output of AND circuit 15, is output to a dummy code generating circuit to complete the transmission of the dummy code.
JP6257679A 1979-05-23 1979-05-23 Facsimile signal transmission system Pending JPS55154876A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6257679A JPS55154876A (en) 1979-05-23 1979-05-23 Facsimile signal transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6257679A JPS55154876A (en) 1979-05-23 1979-05-23 Facsimile signal transmission system

Publications (1)

Publication Number Publication Date
JPS55154876A true JPS55154876A (en) 1980-12-02

Family

ID=13204265

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6257679A Pending JPS55154876A (en) 1979-05-23 1979-05-23 Facsimile signal transmission system

Country Status (1)

Country Link
JP (1) JPS55154876A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0287775A (en) * 1988-09-24 1990-03-28 Ricoh Co Ltd Facsimile equipment with error correction function
JPH02280490A (en) * 1989-04-20 1990-11-16 Sony Corp Method and apparatus for transmitting picture data

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0287775A (en) * 1988-09-24 1990-03-28 Ricoh Co Ltd Facsimile equipment with error correction function
JPH02280490A (en) * 1989-04-20 1990-11-16 Sony Corp Method and apparatus for transmitting picture data

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