JPS5783967A - Facimile transmission system - Google Patents

Facimile transmission system

Info

Publication number
JPS5783967A
JPS5783967A JP55159458A JP15945880A JPS5783967A JP S5783967 A JPS5783967 A JP S5783967A JP 55159458 A JP55159458 A JP 55159458A JP 15945880 A JP15945880 A JP 15945880A JP S5783967 A JPS5783967 A JP S5783967A
Authority
JP
Japan
Prior art keywords
picture
section
speed
variation
buffer memory
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
JP55159458A
Other languages
Japanese (ja)
Other versions
JPH0119309B2 (en
Inventor
Seisuke 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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP55159458A priority Critical patent/JPS5783967A/en
Publication of JPS5783967A publication Critical patent/JPS5783967A/en
Publication of JPH0119309B2 publication Critical patent/JPH0119309B2/ja
Granted 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimiles In General (AREA)

Abstract

PURPOSE:To shorten transmission time as much as possible by dividing one scanning line into sections, and by transmitting a variation state signal for gradations of a picture in each section and an information signal for the picture. CONSTITUTION:A picture is scanned by, for example, a high-speed scanning part 1 and an obtained information singal is stored in a buffer memory 2 and also differentiated by a differentiating circuit 3 to detect the variation state of the picture. Then, an absolute-value amplifier 4 finds the rate of the variation and on the basis of the hold value of a maximum value in each section, a read speed control circuit 6 determines the transmission speed of each section. Then, the picture information signal stored in the buffer memory 2 is read out at a low speed when the maximum variation rate of the section is high or at a high speed when low, and then sending to a transmission line through a switcher 9 and a modulator 10.
JP55159458A 1980-11-14 1980-11-14 Facimile transmission system Granted JPS5783967A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55159458A JPS5783967A (en) 1980-11-14 1980-11-14 Facimile transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55159458A JPS5783967A (en) 1980-11-14 1980-11-14 Facimile transmission system

Publications (2)

Publication Number Publication Date
JPS5783967A true JPS5783967A (en) 1982-05-26
JPH0119309B2 JPH0119309B2 (en) 1989-04-11

Family

ID=15694196

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55159458A Granted JPS5783967A (en) 1980-11-14 1980-11-14 Facimile transmission system

Country Status (1)

Country Link
JP (1) JPS5783967A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54109717A (en) * 1978-02-16 1979-08-28 Oki Electric Ind Co Ltd Transmission system for narrow-band still picture
JPS5591260U (en) * 1978-12-18 1980-06-24

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54109717A (en) * 1978-02-16 1979-08-28 Oki Electric Ind Co Ltd Transmission system for narrow-band still picture
JPS5591260U (en) * 1978-12-18 1980-06-24

Also Published As

Publication number Publication date
JPH0119309B2 (en) 1989-04-11

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