JPS566567A - Picture signal correcting circuit - Google Patents

Picture signal correcting circuit

Info

Publication number
JPS566567A
JPS566567A JP8131079A JP8131079A JPS566567A JP S566567 A JPS566567 A JP S566567A JP 8131079 A JP8131079 A JP 8131079A JP 8131079 A JP8131079 A JP 8131079A JP S566567 A JPS566567 A JP S566567A
Authority
JP
Japan
Prior art keywords
fluctuation
signal
correction
supplied
scanning speed
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
JP8131079A
Other languages
Japanese (ja)
Inventor
Mamoru Maeda
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 JP8131079A priority Critical patent/JPS566567A/en
Publication of JPS566567A publication Critical patent/JPS566567A/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

Landscapes

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

Abstract

PURPOSE:To prevent the effect of the fluctuation of the scanning speed, by giving correction to the fluctuation of the input signal level which is caused by the fluctuation of one scanning time of the hand scanner. CONSTITUTION:Controller 62 is supplied start pulse ST to produce holding signal, and thus holds the output of integral network 63 to sample holder 64. Furthermore, circuit 63 is reset to secure the integration from the O level to the next reset command. Accordingly, the holding voltage of holder 64 features the value proportional to the storage time. And if this holding voltage is converted into the signal corresponding to the reciprocal value through divider circuit 65, the correction signal is obtained. Then video signal VO with the fluctuation of the scanning speed received is supplied to one input terminal of analog multiplier 61; and the correction signal is supplied to the other input terminal each. Thus normal signal VON with correction given to the fluctuation of the scanning speed is delivered to the output end of the terminal. In such way, a copy free from uneven density can be obtained.
JP8131079A 1979-06-29 1979-06-29 Picture signal correcting circuit Pending JPS566567A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8131079A JPS566567A (en) 1979-06-29 1979-06-29 Picture signal correcting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8131079A JPS566567A (en) 1979-06-29 1979-06-29 Picture signal correcting circuit

Publications (1)

Publication Number Publication Date
JPS566567A true JPS566567A (en) 1981-01-23

Family

ID=13742818

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8131079A Pending JPS566567A (en) 1979-06-29 1979-06-29 Picture signal correcting circuit

Country Status (1)

Country Link
JP (1) JPS566567A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6123462A (en) * 1984-07-11 1986-01-31 Matsushita Electric Ind Co Ltd Copying machine
JPS6282127A (en) * 1985-10-08 1987-04-15 Komatsu Ltd Controller for working machine on power shovel
JPH02183318A (en) * 1989-01-09 1990-07-17 Toyota Autom Loom Works Ltd Flow rate controller
EP0808054A2 (en) * 1996-05-17 1997-11-19 Nec Corporation Image reading apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6123462A (en) * 1984-07-11 1986-01-31 Matsushita Electric Ind Co Ltd Copying machine
JPH0528024B2 (en) * 1984-07-11 1993-04-23 Matsushita Electric Ind Co Ltd
JPS6282127A (en) * 1985-10-08 1987-04-15 Komatsu Ltd Controller for working machine on power shovel
JPH02183318A (en) * 1989-01-09 1990-07-17 Toyota Autom Loom Works Ltd Flow rate controller
EP0808054A2 (en) * 1996-05-17 1997-11-19 Nec Corporation Image reading apparatus
EP0808054A3 (en) * 1996-05-17 1999-05-12 Nec Corporation Image reading apparatus

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