FR2643767B1 - Circuit de verrouillage de niveau pour signaux video - Google Patents

Circuit de verrouillage de niveau pour signaux video

Info

Publication number
FR2643767B1
FR2643767B1 FR909002543A FR9002543A FR2643767B1 FR 2643767 B1 FR2643767 B1 FR 2643767B1 FR 909002543 A FR909002543 A FR 909002543A FR 9002543 A FR9002543 A FR 9002543A FR 2643767 B1 FR2643767 B1 FR 2643767B1
Authority
FR
France
Prior art keywords
video signals
lock circuit
level lock
level
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.)
Expired - Lifetime
Application number
FR909002543A
Other languages
English (en)
Other versions
FR2643767A1 (fr
Inventor
James Hedley Wilkinson
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Publication of FR2643767A1 publication Critical patent/FR2643767A1/fr
Application granted granted Critical
Publication of FR2643767B1 publication Critical patent/FR2643767B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04N5/18—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit
    • H04N5/185—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit for the black level

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
FR909002543A 1989-02-28 1990-02-28 Circuit de verrouillage de niveau pour signaux video Expired - Lifetime FR2643767B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8904508A GB2228643B (en) 1989-02-28 1989-02-28 Video signal clamping

Publications (2)

Publication Number Publication Date
FR2643767A1 FR2643767A1 (fr) 1990-08-31
FR2643767B1 true FR2643767B1 (fr) 1992-07-31

Family

ID=10652432

Family Applications (1)

Application Number Title Priority Date Filing Date
FR909002543A Expired - Lifetime FR2643767B1 (fr) 1989-02-28 1990-02-28 Circuit de verrouillage de niveau pour signaux video

Country Status (5)

Country Link
US (1) US5057920A (fr)
JP (1) JPH02276371A (fr)
DE (1) DE4005798C2 (fr)
FR (1) FR2643767B1 (fr)
GB (1) GB2228643B (fr)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0854641B1 (fr) * 1990-08-30 2002-05-29 Canon Kabushiki Kaisha Traitement de signal d'image
JP3143117B2 (ja) * 1990-09-25 2001-03-07 キヤノン株式会社 信号処理装置
US5296929A (en) * 1990-10-31 1994-03-22 Matsushita Electric Industrial Co., Ltd. Automatic correction apparatus for video signal of digital VTR
WO1992010877A1 (fr) * 1990-12-06 1992-06-25 Sony Corporation Circuit de fixation de niveau a retroaction
JP3047927B2 (ja) * 1991-04-09 2000-06-05 三菱電機株式会社 映像信号クランプ回路
US5410360A (en) * 1991-06-14 1995-04-25 Wavephore, Inc. Timing control for injecting a burst and data into a video signal
US5559559A (en) * 1991-06-14 1996-09-24 Wavephore, Inc. Transmitting a secondary signal with dynamic injection level control
US5327237A (en) * 1991-06-14 1994-07-05 Wavephore, Inc. Transmitting data with video
US5831679A (en) * 1991-06-14 1998-11-03 Wavephore, Inc. Network for retrieval and video transmission of information
US5387941A (en) * 1991-06-14 1995-02-07 Wavephore, Inc. Data with video transmitter
US5617148A (en) * 1991-06-14 1997-04-01 Wavephore, Inc. Filter by-pass for transmitting an additional signal with a video signal
JP3211969B2 (ja) * 1991-06-27 2001-09-25 ソニー株式会社 表示装置
US5270819A (en) * 1991-07-29 1993-12-14 The Grass Valley Group, Inc. Single loop analog-to-digital conversion and video clamping circuit compatible with automated diagnostics
JP2814039B2 (ja) * 1991-09-12 1998-10-22 シャープ株式会社 クランプ回路
US5371552A (en) * 1991-10-31 1994-12-06 North American Philips Corporation Clamping circuit with offset compensation for analog-to-digital converters
US5410365A (en) * 1992-04-02 1995-04-25 Sony Corporation Video camera with coarse analog and fine digital black level adjustment
DE4215668C2 (de) * 1992-05-13 2003-06-12 Thomson Brandt Gmbh Klemmschaltung für ein digitales Videosignal
JPH06259541A (ja) * 1992-10-30 1994-09-16 Toshiba Corp 画像歪み補正方法およびそのシステム
KR0128520B1 (ko) * 1993-02-26 1998-04-04 김광호 동기신호 분배기를 이용한 키드 클램프회로
US5659355A (en) * 1994-10-31 1997-08-19 Eastman Kodak Company CCD dark mean level correction circuit employing digital processing and analog subtraction requiring no advance knowledge of dark mean level
US5684609A (en) * 1996-02-05 1997-11-04 Eastman Kodak Company D.C. offset restoration for image scanners
FR2755323A1 (fr) * 1996-10-25 1998-04-30 Philips Electronics Nv Dispositif de conversion analogique/numerique
GB9709498D0 (en) * 1997-05-09 1997-07-02 Switched Reluctance Drives Ltd Transducer offset compensation
US7106231B2 (en) * 2003-11-04 2006-09-12 Mstar Semiconductor, Inc. Video signal processing system including analog to digital converter and related method for calibrating analog to digital converter
JP4541976B2 (ja) * 2005-06-17 2010-09-08 キヤノン株式会社 表示装置

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB932173A (en) * 1960-05-23 1963-07-24 Gen Precision Inc Sub-miniature gyro
US3670100A (en) * 1971-03-29 1972-06-13 Telemation Automatic reference level set for television cameras
GB1536215A (en) * 1976-07-05 1978-12-20 Decca Ltd Clamping circuits for television signals
US4110790A (en) * 1977-01-19 1978-08-29 Gte Sylvania Incorporated Video processing system providing gain control, aperture control, and black level control
DE3007520A1 (de) * 1980-02-28 1981-09-17 Robert Bosch Gmbh, 7000 Stuttgart Schaltungsanordnung zur demodulation eines quadraturmodulierten und danach digitalisierten farbfernsehsignale
JPS57208770A (en) * 1981-06-19 1982-12-21 Hitachi Ltd Dc level automatic compensating circuit for analog signal repetitively including reference level signal
US4403253A (en) * 1981-12-28 1983-09-06 General Electric Company Uniform distribution video processor with controlled reference voltages
FR2524748A1 (fr) * 1982-04-02 1983-10-07 Thomson Csf Circuit numerique d'alignement de niveau d'un signal analogique
US4742392A (en) * 1983-08-04 1988-05-03 Canon Kabushiki Kaisha Clamp circuit with feed back
JPS60113586A (ja) * 1983-11-24 1985-06-20 Nec Corp クランプ装置
US4663666A (en) * 1985-01-23 1987-05-05 Vsp, Inc. Camera output data correction apparatus
NL8700294A (nl) * 1987-02-09 1988-09-01 At & T & Philips Telecomm Klemcircuit voor een televisietransmissiesysteem.
JPS645569U (fr) * 1987-06-26 1989-01-12

Also Published As

Publication number Publication date
FR2643767A1 (fr) 1990-08-31
GB8904508D0 (en) 1989-04-12
JPH02276371A (ja) 1990-11-13
GB2228643B (en) 1993-05-19
DE4005798C2 (de) 2001-05-31
US5057920A (en) 1991-10-15
GB2228643A (en) 1990-08-29
DE4005798A1 (de) 1990-08-30

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Legal Events

Date Code Title Description
ST Notification of lapse

Effective date: 20061031