JPS5738064A - Video reader - Google Patents

Video reader

Info

Publication number
JPS5738064A
JPS5738064A JP11449980A JP11449980A JPS5738064A JP S5738064 A JPS5738064 A JP S5738064A JP 11449980 A JP11449980 A JP 11449980A JP 11449980 A JP11449980 A JP 11449980A JP S5738064 A JPS5738064 A JP S5738064A
Authority
JP
Japan
Prior art keywords
output
amplifier
voltage
image sensor
capacitor
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
JP11449980A
Other languages
Japanese (ja)
Other versions
JPS6226630B2 (en
Inventor
Tomiji Kubota
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.)
Panasonic System Solutions Japan Co Ltd
Original Assignee
Matsushita Graphic Communication Systems Inc
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 Matsushita Graphic Communication Systems Inc filed Critical Matsushita Graphic Communication Systems Inc
Priority to JP11449980A priority Critical patent/JPS5738064A/en
Publication of JPS5738064A publication Critical patent/JPS5738064A/en
Publication of JPS6226630B2 publication Critical patent/JPS6226630B2/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
    • H04N1/40—Picture signal circuits
    • H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
    • H04N1/4072—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on the contents of the original

Landscapes

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

Abstract

PURPOSE:To compensate an offset voltage, by picking up an output of a differetial amplifier amplifying the output of a solidstate image sensor during the nonsignal period of the image sensor and feeding back the output to the differential amplifier via an amplifying circuit and a volage storage circuit. CONSTITUTION:During nonsignal period in which a solidstate image sensor 3 does not transmit an original video signal d for one line's share of main scanning, a section display signal f of a control circuit 2 transmitting a video signal transmission start signal b to the image sensor 3 turns on a switch 5, then the output h of an operaional amplifier 9 inputting the output of a differential amplifer 7 charges up a capacitor C2. An operational amplifier 12 amplifies a voltage of the C2 and the output holds a capacitor C3 of a voltage storage circuit 13 at a voltage k and it is inputted to the plus side of the amplifier 7. On the other hand, during the transmission of a video signal d, the switch 5 is turned and the voltage k is held since the value of the capacitor C3 and the resistor 9 is made larger. Thus, an output always constant is fed back to the amplifier 7, the offset voltage can be compensated automatically.
JP11449980A 1980-08-19 1980-08-19 Video reader Granted JPS5738064A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11449980A JPS5738064A (en) 1980-08-19 1980-08-19 Video reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11449980A JPS5738064A (en) 1980-08-19 1980-08-19 Video reader

Publications (2)

Publication Number Publication Date
JPS5738064A true JPS5738064A (en) 1982-03-02
JPS6226630B2 JPS6226630B2 (en) 1987-06-10

Family

ID=14639277

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11449980A Granted JPS5738064A (en) 1980-08-19 1980-08-19 Video reader

Country Status (1)

Country Link
JP (1) JPS5738064A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03153145A (en) * 1989-11-10 1991-07-01 Nec Corp Carrier recovery system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51105712A (en) * 1975-03-14 1976-09-18 Yokogawa Electric Works Ltd 2 chishingohenkankairo
JPS5383515A (en) * 1976-12-29 1978-07-24 Fujitsu Ltd Quantization circuit for picture signal
JPS53113487A (en) * 1977-03-15 1978-10-03 Teii Deii Kei Fueachiyairudo K Method of deleting dark current of charge transfer element

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51105712A (en) * 1975-03-14 1976-09-18 Yokogawa Electric Works Ltd 2 chishingohenkankairo
JPS5383515A (en) * 1976-12-29 1978-07-24 Fujitsu Ltd Quantization circuit for picture signal
JPS53113487A (en) * 1977-03-15 1978-10-03 Teii Deii Kei Fueachiyairudo K Method of deleting dark current of charge transfer element

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03153145A (en) * 1989-11-10 1991-07-01 Nec Corp Carrier recovery system

Also Published As

Publication number Publication date
JPS6226630B2 (en) 1987-06-10

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