GB2212692B - Method and circuit for the black level control of a video signal - Google Patents

Method and circuit for the black level control of a video signal

Info

Publication number
GB2212692B
GB2212692B GB8830122A GB8830122A GB2212692B GB 2212692 B GB2212692 B GB 2212692B GB 8830122 A GB8830122 A GB 8830122A GB 8830122 A GB8830122 A GB 8830122A GB 2212692 B GB2212692 B GB 2212692B
Authority
GB
United Kingdom
Prior art keywords
circuit
video signal
level control
black level
black
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
GB8830122A
Other versions
GB2212692A (en
GB8830122D0 (en
Inventor
Martin Seitz
Wolfgang Schiffler
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.)
Philips GmbH
Original Assignee
BTS Broadcast Television Systems GmbH
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 BTS Broadcast Television Systems GmbH filed Critical BTS Broadcast Television Systems GmbH
Publication of GB8830122D0 publication Critical patent/GB8830122D0/en
Publication of GB2212692A publication Critical patent/GB2212692A/en
Application granted granted Critical
Publication of GB2212692B publication Critical patent/GB2212692B/en
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)
  • Analogue/Digital Conversion (AREA)
  • Picture Signal Circuits (AREA)
GB8830122A 1987-12-24 1988-12-23 Method and circuit for the black level control of a video signal Expired - Lifetime GB2212692B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873744076 DE3744076C2 (en) 1987-12-24 1987-12-24 Method and circuit for black level control of a video signal

Publications (3)

Publication Number Publication Date
GB8830122D0 GB8830122D0 (en) 1989-02-22
GB2212692A GB2212692A (en) 1989-07-26
GB2212692B true GB2212692B (en) 1992-04-08

Family

ID=6343586

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8830122A Expired - Lifetime GB2212692B (en) 1987-12-24 1988-12-23 Method and circuit for the black level control of a video signal

Country Status (3)

Country Link
DE (1) DE3744076C2 (en)
FR (1) FR2625397A1 (en)
GB (1) GB2212692B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2661060B1 (en) * 1990-04-11 1996-02-23 Telediffusion Fse DEVICE FOR SUPPRESSING CLAMPING NOISE FROM A RECEIVING TV SIGNAL.
JPH0449780A (en) * 1990-06-18 1992-02-19 Victor Co Of Japan Ltd Video signal clamping circuit
DE4244867C2 (en) * 1991-04-09 1996-01-18 Mitsubishi Electric Corp Video signal clamping circuit holding DC voltage at determined value
JP3047927B2 (en) * 1991-04-09 2000-06-05 三菱電機株式会社 Video signal clamp circuit
DE4215668C2 (en) * 1992-05-13 2003-06-12 Thomson Brandt Gmbh Clamp circuit for a digital video signal
JPH066809A (en) * 1992-06-16 1994-01-14 Toshiba Corp Picture signal processor
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
FR2755323A1 (en) * 1996-10-25 1998-04-30 Philips Electronics Nv ANALOG / DIGITAL CONVERSION DEVICE

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0091339A1 (en) * 1982-04-02 1983-10-12 Thomson-Csf Digital clamp circuit for an analog signal
US4562741A (en) * 1984-04-20 1986-01-07 Craig Hosterman Pressure relief valve with pressure indicating means

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6139625A (en) * 1984-07-28 1986-02-25 Victor Co Of Japan Ltd Analog/digital converter
JPS62230168A (en) * 1986-03-31 1987-10-08 Toshiba Corp Digital television signal processing circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0091339A1 (en) * 1982-04-02 1983-10-12 Thomson-Csf Digital clamp circuit for an analog signal
US4562741A (en) * 1984-04-20 1986-01-07 Craig Hosterman Pressure relief valve with pressure indicating means

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Note EP0091339 A is equivalent to US4562471 A *

Also Published As

Publication number Publication date
GB2212692A (en) 1989-07-26
DE3744076A1 (en) 1989-07-13
FR2625397A1 (en) 1989-06-30
DE3744076C2 (en) 1995-05-11
GB8830122D0 (en) 1989-02-22

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19981223