JPS55153473A - Generating circuit for binary signal - Google Patents

Generating circuit for binary signal

Info

Publication number
JPS55153473A
JPS55153473A JP6126879A JP6126879A JPS55153473A JP S55153473 A JPS55153473 A JP S55153473A JP 6126879 A JP6126879 A JP 6126879A JP 6126879 A JP6126879 A JP 6126879A JP S55153473 A JPS55153473 A JP S55153473A
Authority
JP
Japan
Prior art keywords
signal
readout
amount
pulse
video signal
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
JP6126879A
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 JP6126879A priority Critical patent/JPS55153473A/en
Publication of JPS55153473A publication Critical patent/JPS55153473A/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
    • H04N1/403—Discrimination between the two tones in the picture signal of a two-tone original

Landscapes

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

Abstract

PURPOSE:To prevent the deterioration of video quality, by resetting the peak hold circuit holding the peak value of video signal read out, within nonvideo signal period during each readout period. CONSTITUTION:Every time the original and image sensor IS relatively move toward subscanning direction by a given amount, the control pulse to start readout is produced at the timing pulse generator TPG based on the amount of movement detecting pulse Pd from the amount of movement detecting circuit DS. The drive circuit DC supplies the drive pulse to IS so that IS can start the readout of the video signal Sa at a new scanning line unit position. Further, IS generates the reset signal Pr from TPG during the nonvideo signal period Tb on and after the end of readout of video signal at the scanning line position and resets the peak hold circuit PH. Accordingly, the threshold voltage Vs based on the peak value held at PH is reset every end of the main scanning, and the voltage Vs is produced every new main scanning and is given to the comparator COMP for the comparison with the signal Sa, allowing to produce binary signal.
JP6126879A 1979-05-18 1979-05-18 Generating circuit for binary signal Pending JPS55153473A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6126879A JPS55153473A (en) 1979-05-18 1979-05-18 Generating circuit for binary signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6126879A JPS55153473A (en) 1979-05-18 1979-05-18 Generating circuit for binary signal

Publications (1)

Publication Number Publication Date
JPS55153473A true JPS55153473A (en) 1980-11-29

Family

ID=13166300

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6126879A Pending JPS55153473A (en) 1979-05-18 1979-05-18 Generating circuit for binary signal

Country Status (1)

Country Link
JP (1) JPS55153473A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63131261U (en) * 1987-02-10 1988-08-26
JPH03127552A (en) * 1989-10-13 1991-05-30 Fuji Photo Film Co Ltd Binarizing circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63131261U (en) * 1987-02-10 1988-08-26
JPH03127552A (en) * 1989-10-13 1991-05-30 Fuji Photo Film Co Ltd Binarizing circuit

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