JPS5617569A - Secondary scanning method of facsimile transmitter - Google Patents

Secondary scanning method of facsimile transmitter

Info

Publication number
JPS5617569A
JPS5617569A JP9265279A JP9265279A JPS5617569A JP S5617569 A JPS5617569 A JP S5617569A JP 9265279 A JP9265279 A JP 9265279A JP 9265279 A JP9265279 A JP 9265279A JP S5617569 A JPS5617569 A JP S5617569A
Authority
JP
Japan
Prior art keywords
bit number
coding bit
secondary scanning
coding
circuit
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
JP9265279A
Other languages
Japanese (ja)
Other versions
JPS5919664B2 (en
Inventor
Ryota Suzuki
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 JP54092652A priority Critical patent/JPS5919664B2/en
Publication of JPS5617569A publication Critical patent/JPS5617569A/en
Publication of JPS5919664B2 publication Critical patent/JPS5919664B2/en
Expired 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
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/17—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa the scanning speed being dependent on content of picture

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

PURPOSE:To ensure a smooth operation without stopping the secondary scanning, by setting previously N units of secondary scanning velocities corresponding to the transmission time required for one line and then detecting the coding bit number generated with every line to select the velocity. CONSTITUTION:The coding signals sent from coding circuit 6 which gives coding to the picture signals are transmitted to buffer memory 7 as well as to coding bit number detecting circuit 9. Circuit 9 detects the coding bit number generated with every line, and coding bit number detecting signal 10 showing the detected coding bit number is sent to secondary scanning control circuit 11. Circuit 11 decreaces the secondary scanning velocity when the coding bit number is large and in order to secure a large arriving time at the line to be scanned next. On the other hand, the secondary scanning velocity is increased when the coding bit number is small, and secondary scanning velocity control signal 12 is set previously and in correspondence to the coding bit number so that both the underflow and overflow may be prevented for memory 7. This signal 12 is then transmitted to secondary secanning drive circuit 13.
JP54092652A 1979-07-23 1979-07-23 Sub-scanning method of facsimile transmitter Expired JPS5919664B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54092652A JPS5919664B2 (en) 1979-07-23 1979-07-23 Sub-scanning method of facsimile transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54092652A JPS5919664B2 (en) 1979-07-23 1979-07-23 Sub-scanning method of facsimile transmitter

Publications (2)

Publication Number Publication Date
JPS5617569A true JPS5617569A (en) 1981-02-19
JPS5919664B2 JPS5919664B2 (en) 1984-05-08

Family

ID=14060387

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54092652A Expired JPS5919664B2 (en) 1979-07-23 1979-07-23 Sub-scanning method of facsimile transmitter

Country Status (1)

Country Link
JP (1) JPS5919664B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5881380A (en) * 1981-10-30 1983-05-16 ゼロツクス・コ−ポレ−シヨン Method and device for scanning raster

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5881380A (en) * 1981-10-30 1983-05-16 ゼロツクス・コ−ポレ−シヨン Method and device for scanning raster
JPH0531342B2 (en) * 1981-10-30 1993-05-12 Xerox Corp

Also Published As

Publication number Publication date
JPS5919664B2 (en) 1984-05-08

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