FR2442561A1 - Level matching and luminance suppressing circuit for colour TV set - uses same reference voltage source for black level limiting and signal suppression during line flyback - Google Patents

Level matching and luminance suppressing circuit for colour TV set - uses same reference voltage source for black level limiting and signal suppression during line flyback

Info

Publication number
FR2442561A1
FR2442561A1 FR7832763A FR7832763A FR2442561A1 FR 2442561 A1 FR2442561 A1 FR 2442561A1 FR 7832763 A FR7832763 A FR 7832763A FR 7832763 A FR7832763 A FR 7832763A FR 2442561 A1 FR2442561 A1 FR 2442561A1
Authority
FR
France
Prior art keywords
reference voltage
level
voltage source
during line
colour
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
FR7832763A
Other languages
French (fr)
Other versions
FR2442561B1 (en
Inventor
Daniel Wojerz
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Priority to FR7832763A priority Critical patent/FR2442561A1/en
Priority to DE19792946805 priority patent/DE2946805A1/en
Publication of FR2442561A1 publication Critical patent/FR2442561A1/en
Application granted granted Critical
Publication of FR2442561B1 publication Critical patent/FR2442561B1/fr
Granted 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

The circuit has an impedance-matching input stage, an inverting amplifier and an impedance-matching output stage. A level circuit holds the voltage of the black level to the level of a reference voltage. A suppressor suppresses the signal during line flyback. The level circuit and the suppressor use the same single reference voltage source. A sample comparator compares the output voltage from the circuit with the reference and its impedance is small during operation but high out of operation. During line flyback the impedance matching resistor of the luminance delay line is short circuited to protect it against interference.
FR7832763A 1978-11-21 1978-11-21 Level matching and luminance suppressing circuit for colour TV set - uses same reference voltage source for black level limiting and signal suppression during line flyback Granted FR2442561A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR7832763A FR2442561A1 (en) 1978-11-21 1978-11-21 Level matching and luminance suppressing circuit for colour TV set - uses same reference voltage source for black level limiting and signal suppression during line flyback
DE19792946805 DE2946805A1 (en) 1978-11-21 1979-11-20 CIRCUIT ARRANGEMENT FOR LEVEL ADJUSTMENT AND SUPPRESSION OF THE LUMINAIRE SIGNALS IN A TELEVISION RECEIVER

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7832763A FR2442561A1 (en) 1978-11-21 1978-11-21 Level matching and luminance suppressing circuit for colour TV set - uses same reference voltage source for black level limiting and signal suppression during line flyback

Publications (2)

Publication Number Publication Date
FR2442561A1 true FR2442561A1 (en) 1980-06-20
FR2442561B1 FR2442561B1 (en) 1981-05-29

Family

ID=9215117

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7832763A Granted FR2442561A1 (en) 1978-11-21 1978-11-21 Level matching and luminance suppressing circuit for colour TV set - uses same reference voltage source for black level limiting and signal suppression during line flyback

Country Status (2)

Country Link
DE (1) DE2946805A1 (en)
FR (1) FR2442561A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2875332A (en) * 1953-12-01 1959-02-24 Rca Corp Stabilized clipper and clamp circuits

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711913A1 (en) * 1976-03-19 1977-09-22 Rca Corp System reference signal insertion circuit - applies to video signal with active and flyback intervals and uses two non:additive signal mixers (NL 21.9.77)

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2875332A (en) * 1953-12-01 1959-02-24 Rca Corp Stabilized clipper and clamp circuits

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EXBK/78 *

Also Published As

Publication number Publication date
FR2442561B1 (en) 1981-05-29
DE2946805A1 (en) 1980-05-22

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Legal Events

Date Code Title Description
ST Notification of lapse