JPS57109467A - Video camera - Google Patents

Video camera

Info

Publication number
JPS57109467A
JPS57109467A JP55183972A JP18397280A JPS57109467A JP S57109467 A JPS57109467 A JP S57109467A JP 55183972 A JP55183972 A JP 55183972A JP 18397280 A JP18397280 A JP 18397280A JP S57109467 A JPS57109467 A JP S57109467A
Authority
JP
Japan
Prior art keywords
signal
noise
band noise
low band
equalizing circuit
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
JP55183972A
Other languages
Japanese (ja)
Inventor
Seiji Hashimoto
Nobuyoshi Tanaka
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.)
Canon Inc
Original Assignee
Canon 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 Canon Inc filed Critical Canon Inc
Priority to JP55183972A priority Critical patent/JPS57109467A/en
Publication of JPS57109467A publication Critical patent/JPS57109467A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)

Abstract

PURPOSE:To improve a low band noise, by constituting so that break frequency of a low band noise characteristic of an image pickup element output amplifier is made to approach a noise improving limit frequency of a clamping circuit by an equalizing circuit, and clamping a clamp reference signal. CONSTITUTION:A signal 1a read out from a solid image pickup element 10 is amplified to a suitable level by a preamplifier 30, and makes only a video signal 2a pass through by a low-pass filter 40. The video signal 2a is inputted to an equalizing circuit 50 at first, and by the equalizing circuit 50, a signal 3a whose break frequency having a 1/f noise component has been changed in the proximity of fLKHz from fA is outputted. The outputted signal 3a is inputted to a clamping circuit 60 and is clamped, by which a low band noise becomes a signal 4a having the same noise level as a high band noise. Also, the signal 4a passes through an equalizing circuit 70, its frequency characteristic is compensated, and after all, it becomes a signal whose low band noise has been improved, such as a signal 5a.
JP55183972A 1980-12-26 1980-12-26 Video camera Pending JPS57109467A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55183972A JPS57109467A (en) 1980-12-26 1980-12-26 Video camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55183972A JPS57109467A (en) 1980-12-26 1980-12-26 Video camera

Publications (1)

Publication Number Publication Date
JPS57109467A true JPS57109467A (en) 1982-07-07

Family

ID=16145043

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55183972A Pending JPS57109467A (en) 1980-12-26 1980-12-26 Video camera

Country Status (1)

Country Link
JP (1) JPS57109467A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60210070A (en) * 1984-04-03 1985-10-22 Hitachi Ltd Video camera
EP0425761A2 (en) * 1989-10-05 1991-05-08 Pioneer Electronic Corporation Noise reduction circuit for image signal and image displaying system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60210070A (en) * 1984-04-03 1985-10-22 Hitachi Ltd Video camera
JPH0553107B2 (en) * 1984-04-03 1993-08-09 Hitachi Ltd
EP0425761A2 (en) * 1989-10-05 1991-05-08 Pioneer Electronic Corporation Noise reduction circuit for image signal and image displaying system
EP0425761A3 (en) * 1989-10-05 1991-09-11 Pioneer Electronic Corporation Noise reduction circuit for image signal and image displaying system
EP0480910A2 (en) * 1989-10-05 1992-04-15 Pioneer Electronic Corporation Image displaying system
US5159450A (en) * 1989-10-05 1992-10-27 Pioneer Electronic Corporation Noise reduction circuit and compatable plural-unit display

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