GB734438A - Improvements in or relating to automatic gain control in television receivers - Google Patents

Improvements in or relating to automatic gain control in television receivers

Info

Publication number
GB734438A
GB734438A GB296953A GB296953A GB734438A GB 734438 A GB734438 A GB 734438A GB 296953 A GB296953 A GB 296953A GB 296953 A GB296953 A GB 296953A GB 734438 A GB734438 A GB 734438A
Authority
GB
United Kingdom
Prior art keywords
gain control
feb
automatic gain
control voltage
relating
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
GB296953A
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.)
EK Cole Ltd
Original Assignee
EK Cole Ltd
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 EK Cole Ltd filed Critical EK Cole Ltd
Priority to GB296953A priority Critical patent/GB734438A/en
Publication of GB734438A publication Critical patent/GB734438A/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
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Picture Signal Circuits (AREA)
  • Television Receiver Circuits (AREA)

Abstract

734,438. Automatic gain control. COLE, Ltd., E. K., and HART, G. H. Feb. 3, 1954 [Feb. 3, 1953; Feb. 12, 1953], Nos. 2969/53 and 3928/53. Class 40 (5). In a television receiver an automatic gain control voltage is obtained from a tapping-point on the grid leak L of a synch. separator valve. A variable delay bias is provided by means of a cathode resistor B and may be used as contrast control. The gain control voltage is applied to vision I.F. amplifiers over a smoothing circuit R, C2 and a diode D which prevents the gain control line going positive. To prevent reduction of the gain control voltage during the frame fly-back period and consequential brightening of the first few lines of the picture, a negative pulse is derived from a frame-scan valve F or from the scanning coils and is applied to the gain control line via a resistor R2 and blocking condenser C3.
GB296953A 1953-02-03 1953-02-03 Improvements in or relating to automatic gain control in television receivers Expired GB734438A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB296953A GB734438A (en) 1953-02-03 1953-02-03 Improvements in or relating to automatic gain control in television receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB296953A GB734438A (en) 1953-02-03 1953-02-03 Improvements in or relating to automatic gain control in television receivers

Publications (1)

Publication Number Publication Date
GB734438A true GB734438A (en) 1955-08-03

Family

ID=9749438

Family Applications (1)

Application Number Title Priority Date Filing Date
GB296953A Expired GB734438A (en) 1953-02-03 1953-02-03 Improvements in or relating to automatic gain control in television receivers

Country Status (1)

Country Link
GB (1) GB734438A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1076735B (en) * 1957-05-03 1960-03-03 Blaupunkt Werke Gmbh TV receiver with keyed control and a device for hum suppression during the heating-up time

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1076735B (en) * 1957-05-03 1960-03-03 Blaupunkt Werke Gmbh TV receiver with keyed control and a device for hum suppression during the heating-up time

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