GB790225A - Improvements in or relating to television receivers - Google Patents

Improvements in or relating to television receivers

Info

Publication number
GB790225A
GB790225A GB3630154A GB3630154A GB790225A GB 790225 A GB790225 A GB 790225A GB 3630154 A GB3630154 A GB 3630154A GB 3630154 A GB3630154 A GB 3630154A GB 790225 A GB790225 A GB 790225A
Authority
GB
United Kingdom
Prior art keywords
diode
resistor
rectifier
dec
anode
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
GB3630154A
Inventor
John Edward Cope
Donald Henry Fisher
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.)
Pye Electronic Products Ltd
Original Assignee
Pye 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 Pye Ltd filed Critical Pye Ltd
Priority to GB3630154A priority Critical patent/GB790225A/en
Publication of GB790225A publication Critical patent/GB790225A/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
    • H04N5/50—Tuning indicators; Automatic tuning control
    • H04N5/505—Invisible or silent tuning

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

790,225. Automatic gain control. PYE, Ltd. Dec. 16, 1955 [Dec. 15, 1954], No. 36301/54. Class 40 (5). In a television receiver with automatic gain control of the " gated " type, the gain of the video channel is reduced until the H.T. efficiency diode comes into operation. In an arrangement as described in Specification 777,801, in which pulses produced by a sampling diode V1 are amplified by a valve V2 and rectified by a diode V3 and form, after smoothing, the A.G.C. potential, a resistor R3 and rectifier M1 are connected in series between the anode of the diode V3 and earth. The anode of rectifier M1 is connected by one resistor R1, to the line output transformer T1 and by another resistor R2 to a source of negative potential; until the efficiency diode V5 becomes operative, the rectifier M1 is biased so as to be non-conductive and a negative bias is applied to the A.G.C. line via resistor R3. Overload before the A.G.C. is operative is thereby prevented. The negative potential may be derived from the grid circuit of the line output valve V4 or alternatively (Fig. 1, not shown) from the sound A.G.C. circuit. Alternatively, or in addition, the screen grids of valves in the video channel may be fed via a potentiometer from the boost voltage.
GB3630154A 1954-12-15 1954-12-15 Improvements in or relating to television receivers Expired GB790225A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3630154A GB790225A (en) 1954-12-15 1954-12-15 Improvements in or relating to television receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3630154A GB790225A (en) 1954-12-15 1954-12-15 Improvements in or relating to television receivers

Publications (1)

Publication Number Publication Date
GB790225A true GB790225A (en) 1958-02-05

Family

ID=10386874

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3630154A Expired GB790225A (en) 1954-12-15 1954-12-15 Improvements in or relating to television receivers

Country Status (1)

Country Link
GB (1) GB790225A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1214267B (en) * 1960-12-28 1966-04-14 Blaupunkt Werke Gmbh TV receiver with two rectifier lines
DE1243717B (en) * 1961-01-20 1967-07-06 Grundig Max Circuit arrangement for overload protection of the picture intermediate frequency amplifier tubes in a television receiver

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1214267B (en) * 1960-12-28 1966-04-14 Blaupunkt Werke Gmbh TV receiver with two rectifier lines
DE1243717B (en) * 1961-01-20 1967-07-06 Grundig Max Circuit arrangement for overload protection of the picture intermediate frequency amplifier tubes in a television receiver

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