GB476935A - Improvements in or relating to television systems - Google Patents

Improvements in or relating to television systems

Info

Publication number
GB476935A
GB476935A GB13795/36A GB1379536A GB476935A GB 476935 A GB476935 A GB 476935A GB 13795/36 A GB13795/36 A GB 13795/36A GB 1379536 A GB1379536 A GB 1379536A GB 476935 A GB476935 A GB 476935A
Authority
GB
United Kingdom
Prior art keywords
signals
output
line
valve
pulses
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
GB13795/36A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB476935A publication Critical patent/GB476935A/en
Priority claimed from GB14776/38A external-priority patent/GB515209A/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)
  • Details Of Television Systems (AREA)
  • Television Systems (AREA)

Abstract

476,935. Television. BLUMLEIN, A. D. May 15, 1936, No. 13795. [Classes 40 (iii) and 40 (v)] The transmitted wave 4, which represents successive lines of the picture, is interrupted by line-synchronizing signals 5 extending in one direction, and signals 7 for the derivation of gain-controlling potentials extending in the opposite direction, beyond the normal amplitudes of the vision signals 4. The double pulses are rectangular and the signal 7 is equal in duration to the signal 5. Frame signals 6 in the whiter-than-white sense are' interrupted by line-synchronizing signals. To produce such a wave form, picture signals, interrupted at the line and frame frequencies, are applied to a valve 8 with its output combined with that of a second valve 11, to which pulses at the line frequency are applied, and the combined output is passed to a third valve 14 the output from which is combined with that from a fourth valve 17, which is also supplied with pulses at the line frequency but delayed with respect to the first set. Automatic gain control, Fig. 5. A receiver includes high or intermediate-frequency amplifiers 22 .. 25, a picture-signal rectifier 28, and a rectifier 36 for providing gain-controlling potentials to the high-frequency amplifiers from the pulses 7. Part of the output of the amplifier 25 is also fed to a further amplifier 26, the output of which is maintained constant by automatic-gain potentials of selected value. The resistance 37 and capacity 38 in the output of the diode 36 have a time constant equal to the period of several lines. The rectifier 28 is coupled through a resistancecapacity circuit 34, 39, with a time constant longer than the period of a line, to the pair of diodes 35, 36, which give an output voltage proportional to the total amplitude of the signals 5, 7. The circuit 34, 39 in combination with the first diode 35 restores the directcurrent level of the signals. Specifications 436,809 and 446,663 are referred to.
GB13795/36A 1938-05-18 1936-05-15 Improvements in or relating to television systems Expired GB476935A (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
GB476935A true GB476935A (en) 1937-12-15

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 After (1)

Application Number Title Priority Date Filing Date
GB22091/39A Expired GB531711A (en) 1938-05-18 1939-07-29 Automatic amplification and black level control for television receivers

Country Status (3)

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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2570249A (en) * 1947-03-29 1951-10-09 Sperry Corp Combining and separating circuits
US2624507A (en) * 1945-09-27 1953-01-06 Ibm Electronic calculating machine
US2624508A (en) * 1946-10-22 1953-01-06 Ibm Electronic dividing and multiplying apparatus

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548436A (en) * 1946-01-25 1951-04-10 Hazeltine Corp Television receiver background control circuit
US2707751A (en) * 1946-03-12 1955-05-03 Harold V Hance Delay line pulse stretcher
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
EP1116086B1 (en) 1998-09-22 2007-02-21 Avocent Huntsville Corporation System for accessing personal computers remotely

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624507A (en) * 1945-09-27 1953-01-06 Ibm Electronic calculating machine
US2624508A (en) * 1946-10-22 1953-01-06 Ibm Electronic dividing and multiplying apparatus
US2570249A (en) * 1947-03-29 1951-10-09 Sperry Corp Combining and separating circuits

Also Published As

Publication number Publication date
FR859498A (en) 1940-12-19
FR50613E (en) 1941-01-27
US2303968A (en) 1942-12-01
GB531711A (en) 1941-01-09

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