GB531711A - Automatic amplification and black level control for television receivers - Google Patents

Automatic amplification and black level control for television receivers

Info

Publication number
GB531711A
GB531711A GB22091/39A GB2209139A GB531711A GB 531711 A GB531711 A GB 531711A GB 22091/39 A GB22091/39 A GB 22091/39A GB 2209139 A GB2209139 A GB 2209139A GB 531711 A GB531711 A GB 531711A
Authority
GB
United Kingdom
Prior art keywords
detector
reproducing device
amplifier
fading
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
GB22091/39A
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.)
HASELTINE CORP
Original Assignee
HASELTINE 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
Priority claimed from GB14776/38A external-priority patent/GB515209A/en
Application filed by HASELTINE CORP filed Critical HASELTINE CORP
Publication of GB531711A publication Critical patent/GB531711A/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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Television Systems (AREA)
  • Details Of Television Systems (AREA)

Abstract

531,711. Automatic amplification control of television receivers. HAZELTINE CORPORATION. July 29, 1939, No. 22091. Convention date, Aug. 26, 1938. [Classes 40 (iii) and 40 (v)] A television receiver is provided with amplification control means for automatically correcting fading signals, said means comprising a byepass delay network 31, Fig. 1, followed by a detector-separator 32 for producing pulses D, Fig. 3, slightly displaced in relation to the synchronizing pulses of the signal, Fig. 2, and of constant amplitude irrespective of the fading from A to A', Fig. 2. The output of the detector separator 32 and the output of the main rectifier 21 are fed together to a detector 42 as well as to the amplifier 15 which leads to the image reproducing device 17. This combined input to the detector 42 is represented by Fig. 4, and the detector yields a control bias, represented by Fig. 5, which is fed to the primary amplifier in the carrier frequency translator 13, for automatic correction of the fading shown at A<SP>1</SP>, Fig. 2. A diode 29 is provided as shown in Fig. 1 between the amplifier 15 and the image reproducing device 17, in order to stabilize the black level of the reproducing device.
GB22091/39A 1938-05-18 1939-07-29 Automatic amplification and black level control for television receivers Expired GB531711A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB14776/38A GB515209A (en) 1938-08-26 1938-05-18 Improvements in or relating to television systems
US226871A US2214847A (en) 1938-08-26 1938-08-26 Automatic amplification and black level control for television receivers

Publications (1)

Publication Number Publication Date
GB531711A true GB531711A (en) 1941-01-09

Family

ID=32095217

Family Applications (2)

Application Number Title Priority Date Filing Date
GB13795/36A Expired GB476935A (en) 1938-05-18 1936-05-15 Improvements in or relating to television systems
GB22091/39A Expired GB531711A (en) 1938-05-18 1939-07-29 Automatic amplification and black level control for television receivers

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB13795/36A Expired GB476935A (en) 1938-05-18 1936-05-15 Improvements in or relating to television systems

Country Status (3)

Country Link
US (1) US2303968A (en)
FR (2) FR50613E (en)
GB (2) GB476935A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE975051C (en) * 1946-01-25 1961-07-20 Hazeltine Corp Device for automatic gain control in television receivers for negatively modulated television characters

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL75747C (en) * 1945-09-27
US2707751A (en) * 1946-03-12 1955-05-03 Harold V Hance Delay line pulse stretcher
NL94873C (en) * 1946-10-22
US2570249A (en) * 1947-03-29 1951-10-09 Sperry Corp Combining and separating circuits
US2515195A (en) * 1947-12-12 1950-07-18 Jr John F Clark Pulse collecting method
US2686220A (en) * 1948-05-28 1954-08-10 Rca Corp Conveyeance of auxiliary information in a television system
GB661890A (en) * 1948-12-17 1951-11-28 Pye Ltd Apparatus for measuring or using for control purposes, the peak voltage of short duration voltage peaks or pulses
US2644130A (en) * 1949-01-24 1953-06-30 Socony Vacuum Oil Co Inc Square wave pulse generating system
US2736801A (en) * 1951-05-16 1956-02-28 Clyde E Wiegand Distributed pulse height discriminator
US2764678A (en) * 1951-06-07 1956-09-25 Airborne Instr Lab Inc Pulse stretcher
US2800584A (en) * 1952-02-28 1957-07-23 Richard F Blake Pulse position decoder
US2836715A (en) * 1953-04-08 1958-05-27 Rca Corp Signal shaping circuit
USRE25284E (en) * 1954-08-04 1962-11-06 D loughlin
US2968036A (en) * 1957-07-12 1961-01-10 Oliver I Steigerwalt Radiant energy signalling system
US2958465A (en) * 1957-07-22 1960-11-01 Ibm Electronic adder
US3068417A (en) * 1959-07-24 1962-12-11 Paul E Fiske Pulse stretcher and shaper
US3247457A (en) * 1961-05-22 1966-04-19 Bell Telephone Labor Inc Analog signal peak detector using tapped delay line and sampling means
US3217100A (en) * 1962-01-03 1965-11-09 Rca Corp Contrast control system
US3629714A (en) * 1970-03-12 1971-12-21 Bell Telephone Labor Inc Electronic sampling and hold circuit
US5402488A (en) * 1991-08-30 1995-03-28 Karlock; James A. Method and apparatus for modifying a video signal
US5410364A (en) * 1992-01-15 1995-04-25 Karlock; James A. Method and apparatus for removing AGC pulses and other undesirable signals from a video signal
US20020091850A1 (en) 1992-10-23 2002-07-11 Cybex Corporation System and method for remote monitoring and operation of personal computers
US5410363A (en) * 1992-12-08 1995-04-25 Lightwave Communications, Inc. Automatic gain control device for transmitting video signals between two locations by use of a known reference pulse during vertical blanking period so as to control the gain of the video signals at the second location
IL142119A0 (en) 1998-09-22 2002-03-10 Cybex Computer Prod Corp System and method for accessing and operating personal computers remotely

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE975051C (en) * 1946-01-25 1961-07-20 Hazeltine Corp Device for automatic gain control in television receivers for negatively modulated television characters

Also Published As

Publication number Publication date
US2303968A (en) 1942-12-01
FR859498A (en) 1940-12-19
FR50613E (en) 1941-01-27
GB476935A (en) 1937-12-15

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