GB1315456A - Television brightness control - Google Patents

Television brightness control

Info

Publication number
GB1315456A
GB1315456A GB1751771A GB1751771A GB1315456A GB 1315456 A GB1315456 A GB 1315456A GB 1751771 A GB1751771 A GB 1751771A GB 1751771 A GB1751771 A GB 1751771A GB 1315456 A GB1315456 A GB 1315456A
Authority
GB
United Kingdom
Prior art keywords
terminal
colour
signal
luminance signal
clamped
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
Application number
GB1751771A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric 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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1315456A publication Critical patent/GB1315456A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/80—Camera processing pipelines; Components thereof
    • H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
    • H04N23/87—Camera processing pipelines; Components thereof for processing colour signals for reinsertion of DC or slowly varying components of colour signals

Landscapes

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

Abstract

1315456 Colour television receiver INTERNATIONAL STANDARD ELECTRIC CORP 27 May 1971 [20 June 1970] 17517/71 Heading H4F Brightness control in a colour television receiver is effected by clamping the luminance signal, before it is matrixed with a colour difference signal, with the aid of square pulses of adjustable magnitude. As shown, a (D.C. clamped) luminance signal is applied at terminal 1 and the square pulses are derived from the voltage at capacitor 16, the magnitude of which is controlled by potentiometer 17, when the diodes 8 and 15 are rendered conductive by horizontal flyback pulses applied to terminal 10. The resulting clamped luminance signal is then matrixed with a colour difference signal applied to terminal 11 to form a colour video signal which is passed to output 31 via a video amplifier 19-40. Alternatively the clamped luminance signal may be passed to output terminal 2. The video amplifier includes a trimmer resistor 28 to compensate for possible differences in the control-voltage requirements of the three guns in a colour display tube, and a trimmer resistor 34 which derives from the flyback pulses at terminal 40 a control signal for presetting the amplifier operating point so that it is not driven beyond its operating range by the maximum white level.
GB1751771A 1970-06-20 1971-05-27 Television brightness control Expired GB1315456A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2030500A DE2030500B2 (en) 1970-06-20 1970-06-20 Circuit arrangement for adjusting the brightness in color television receivers

Publications (1)

Publication Number Publication Date
GB1315456A true GB1315456A (en) 1973-05-02

Family

ID=5774499

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1751771A Expired GB1315456A (en) 1970-06-20 1971-05-27 Television brightness control

Country Status (3)

Country Link
DE (1) DE2030500B2 (en)
FR (1) FR2095382B1 (en)
GB (1) GB1315456A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0127439A1 (en) 1983-05-31 1984-12-05 Burle Technologies, Inc. Brightness control network in a video signal processor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL211500A (en) * 1955-10-19
US3499104A (en) * 1966-06-13 1970-03-03 Rca Corp Video output stage employing stacked high voltage and low voltage transistors

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0127439A1 (en) 1983-05-31 1984-12-05 Burle Technologies, Inc. Brightness control network in a video signal processor
US4598316A (en) * 1983-05-31 1986-07-01 Rca Corporation Brightness control network in a video signal processor with AC coupled output stages
EP0127439B2 (en) † 1983-05-31 1993-03-10 Burle Technologies, Inc. Brightness control network in a video signal processor

Also Published As

Publication number Publication date
DE2030500A1 (en) 1971-12-30
FR2095382B1 (en) 1975-07-11
FR2095382A1 (en) 1972-02-11
DE2030500B2 (en) 1975-05-15

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee