GB816226A - Improvements in or relating to television receivers - Google Patents

Improvements in or relating to television receivers

Info

Publication number
GB816226A
GB816226A GB685156A GB685156A GB816226A GB 816226 A GB816226 A GB 816226A GB 685156 A GB685156 A GB 685156A GB 685156 A GB685156 A GB 685156A GB 816226 A GB816226 A GB 816226A
Authority
GB
United Kingdom
Prior art keywords
signal
component
circuit
march
black level
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
GB685156A
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.)
GEOFFREY CHARLES STANLEY BOWN
General Electric Co PLC
Original Assignee
GEOFFREY CHARLES STANLEY BOWN
General Electric Co PLC
Filing date
Publication date
Application filed by GEOFFREY CHARLES STANLEY BOWN, General Electric Co PLC filed Critical GEOFFREY CHARLES STANLEY BOWN
Publication of GB816226A publication Critical patent/GB816226A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/52—Automatic gain control
    • H04N5/53—Keyed automatic gain control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57—Control of contrast or brightness

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Television Receiver Circuits (AREA)

Abstract

816,226. Automatic gain control. GENERAL ELECTRIC CO. Ltd., and BOWN, G. C. S. March 5, 1957 [March 5, 1956], No. 6851/56. Class 40 (5). [Also in Group XL (b)] In a television receiver in which the black level of the signal output of the video amplifier 4 varies in accordance with the mean level of the signal (i.e. amplifier 4 enhances the -D.C. component with respect to the A.C. component) such a signal cannot be employed directly in an A.G.C. circuit 15 of the kind in which a control voltage is derived by measuring the height of the black level relative to the tips of the synchronizing pulses and it is first necessary to remove the D.C. component by means of capacitor 11 and then restore the normal D.C. component by means of the peak detection action of the grid-cathode circuit of the conventional synchronizing signal separator valve 12 before supplying the signal to circuit 15.
GB685156A 1956-03-05 Improvements in or relating to television receivers Expired GB816226A (en)

Publications (1)

Publication Number Publication Date
GB816226A true GB816226A (en) 1959-07-08

Family

ID=1628754

Family Applications (1)

Application Number Title Priority Date Filing Date
GB685156A Expired GB816226A (en) 1956-03-05 Improvements in or relating to television receivers

Country Status (1)

Country Link
GB (1) GB816226A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4144546A (en) * 1976-05-21 1979-03-13 Indesit Industria Elettrodomestici Television signal processing circuit for correcting amplitude distortions
US4149190A (en) * 1977-10-17 1979-04-10 Xerox Corporation Automatic gain control for video amplifier
US4176379A (en) * 1977-10-17 1979-11-27 Xerox Corporation Video input circuits for video hard copy controller

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4144546A (en) * 1976-05-21 1979-03-13 Indesit Industria Elettrodomestici Television signal processing circuit for correcting amplitude distortions
US4149190A (en) * 1977-10-17 1979-04-10 Xerox Corporation Automatic gain control for video amplifier
US4176379A (en) * 1977-10-17 1979-11-27 Xerox Corporation Video input circuits for video hard copy controller

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