JPS55156468A - Generator for picture signal - Google Patents

Generator for picture signal

Info

Publication number
JPS55156468A
JPS55156468A JP6412979A JP6412979A JPS55156468A JP S55156468 A JPS55156468 A JP S55156468A JP 6412979 A JP6412979 A JP 6412979A JP 6412979 A JP6412979 A JP 6412979A JP S55156468 A JPS55156468 A JP S55156468A
Authority
JP
Japan
Prior art keywords
picture
sensor
period
picture signal
pulses
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
JP6412979A
Other languages
Japanese (ja)
Inventor
Yojiro Sato
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP6412979A priority Critical patent/JPS55156468A/en
Publication of JPS55156468A publication Critical patent/JPS55156468A/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
    • H04N1/40—Picture signal circuits
    • H04N1/40056—Circuits for driving or energising particular reading heads or original illumination means

Landscapes

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

Abstract

PURPOSE:To obtain excellent pictures all the time by forming on a time axis a succession of a picture period, a non-picture period of a specified width and the following picture period and then by selectively extracting only signals in the latter picture period. CONSTITUTION:Inferior value Tpmin of the variation range of time interval Tp of a succession of detection pulses Pd varying with a relative traveling speed in the sub-scanning direction between an original and sensor IS and period Tv of a picture signal read by sensor IS are given relation Tpmin>(2Tv+Tb). Driving circuit DC supplies pulses (d) to sensor IS and on the basis of movement-value detection pulses Pd and clock pulses (b), control pulse generating circuit CC generates control pulses Pc shown by (c), which are supplied to circuit DC and gate pulse generating circuit GPG. From gate circuit G, only the 2nd picture signal Sa0 in picture signal Sa shown by (e) read from sensor IS is selected and sent out to output terminal 0. Thus, picture signal Sao free of variation in signal level can be obtained.
JP6412979A 1979-05-24 1979-05-24 Generator for picture signal Pending JPS55156468A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6412979A JPS55156468A (en) 1979-05-24 1979-05-24 Generator for picture signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6412979A JPS55156468A (en) 1979-05-24 1979-05-24 Generator for picture signal

Publications (1)

Publication Number Publication Date
JPS55156468A true JPS55156468A (en) 1980-12-05

Family

ID=13249144

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6412979A Pending JPS55156468A (en) 1979-05-24 1979-05-24 Generator for picture signal

Country Status (1)

Country Link
JP (1) JPS55156468A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0142358A2 (en) * 1983-11-14 1985-05-22 International Business Machines Corporation Solid state scanner for a variable speed document transport

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0142358A2 (en) * 1983-11-14 1985-05-22 International Business Machines Corporation Solid state scanner for a variable speed document transport

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