GB413401A - Improvements in or relating to television systems - Google Patents

Improvements in or relating to television systems

Info

Publication number
GB413401A
GB413401A GB3743/33A GB374333A GB413401A GB 413401 A GB413401 A GB 413401A GB 3743/33 A GB3743/33 A GB 3743/33A GB 374333 A GB374333 A GB 374333A GB 413401 A GB413401 A GB 413401A
Authority
GB
United Kingdom
Prior art keywords
voltage
scanning
cathode
inductance
intensity
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
GB3743/33A
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
Priority to GB592932A priority Critical patent/GB399469A/en
Application filed by Individual filed Critical Individual
Priority to GB3743/33A priority patent/GB413401A/en
Priority to AT142478D priority patent/AT142478B/en
Priority to BE394625D priority patent/BE394625A/xx
Priority to FR752450D priority patent/FR752450A/en
Priority to FR44556D priority patent/FR44556E/en
Priority to DEC48725D priority patent/DE640742C/en
Priority to AT144599D priority patent/AT144599B/en
Publication of GB413401A publication Critical patent/GB413401A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/30—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical otherwise than with constant velocity or otherwise than in pattern formed by unidirectional, straight, substantially horizontal or vertical lines
    • H04N3/32—Velocity varied in dependence upon picture information
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/86—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements gas-filled tubes or spark-gaps

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Details Of Television Scanning (AREA)

Abstract

413,401. Television. BULLIMORE, W. R., and BEDFORD, L. H., Cossor Works, Highbury Grove, London. Feb. 7, 1933, No. 3743. [Class 40 (iii).] In a television system in which the scanning and reconstruction of an image is effected by varying the speed of the scanning spot in accordance with the variations of the light intensity of different parts of the image, means are incorporated for modulating the intensity of the scanning spot at the receiver for the purpose of intensifying the received image. At the darker portions of the picture the scanning spot does not move at the speeds theoretically required to produce the dark portions of the image contrasted correctly with respect to the light portions, and in the arrangements described the intensity of the cathode beam is decreased as the rate of change of the scanning voltage increases. In Fig. 2 the incoming scanning voltage is applied to the grid of a valve V having in its plate circuit an inductance L and a full wave rectifier W; and the voltage produced across a resistance R is proportional to the rate of change of the voltage on the grid of the valve V or to the scanning velocity. The voltage across R is fed through condenser C1 to the grid of a valve V1 in whose plate circuit is a resistance R2 from which a tapping is taken to the modulating electrode of the cathode-ray tube. In an alternative arrangement, Fig. 3, the scanning voltage is applied to the grids of valves V1, V2 operating in paraphase. The plate circuits are connected to the plates PX1, PX2 of the oscillograph and the resistances R1, R2 are joined by an inductance L to which is coupled a centre-tapped inductance L1. The voltages across the two portions of the inductance are applied to the grids of valves V3, V4 forming a balanced rectifier arrangement, and from a tapping on a resistance R34 a voltage proportional to the rate of change of the scanning voltage is applied to the modulating electrode of the cathode ray tube. The voltage applied to the modulating electrode of the cathode-ray tube is independent of the sign of the velocity and the intensity of the cathode beam is reduced during the fly-back at the end of a line or picture. Specifications 396,422 and 399,469 are referred to.
GB3743/33A 1932-02-27 1933-02-07 Improvements in or relating to television systems Expired GB413401A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
GB592932A GB399469A (en) 1932-02-27 1932-02-27 Improvements in or relating to television systems
GB3743/33A GB413401A (en) 1932-02-27 1933-02-07 Improvements in or relating to television systems
AT142478D AT142478B (en) 1932-02-27 1933-02-25 Remote image transmission.
BE394625D BE394625A (en) 1932-02-27 1933-02-25
FR752450D FR752450A (en) 1932-02-27 1933-02-27 TV system
FR44556D FR44556E (en) 1932-02-27 1934-01-11 TV system
DEC48725D DE640742C (en) 1932-02-27 1934-01-12 Playback method for television pictures transmitted by means of speed modulation
AT144599D AT144599B (en) 1932-02-27 1934-01-19 Television system.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB592932A GB399469A (en) 1932-02-27 1932-02-27 Improvements in or relating to television systems
GB3743/33A GB413401A (en) 1932-02-27 1933-02-07 Improvements in or relating to television systems

Publications (1)

Publication Number Publication Date
GB413401A true GB413401A (en) 1934-07-19

Family

ID=34066581

Family Applications (2)

Application Number Title Priority Date Filing Date
GB592932A Expired GB399469A (en) 1932-02-27 1932-02-27 Improvements in or relating to television systems
GB3743/33A Expired GB413401A (en) 1932-02-27 1933-02-07 Improvements in or relating to television systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB592932A Expired GB399469A (en) 1932-02-27 1932-02-27 Improvements in or relating to television systems

Country Status (5)

Country Link
AT (2) AT142478B (en)
BE (1) BE394625A (en)
DE (1) DE640742C (en)
FR (2) FR752450A (en)
GB (2) GB399469A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678964A (en) * 1950-08-14 1954-05-18 Hazeltine Research Inc Modifying the transient response of image-reproducers
US2851522A (en) * 1951-12-13 1958-09-09 Columbia Broadcasting Syst Inc Television

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678964A (en) * 1950-08-14 1954-05-18 Hazeltine Research Inc Modifying the transient response of image-reproducers
US2851522A (en) * 1951-12-13 1958-09-09 Columbia Broadcasting Syst Inc Television

Also Published As

Publication number Publication date
AT142478B (en) 1935-07-25
FR752450A (en) 1933-09-21
FR44556E (en) 1935-03-04
DE640742C (en) 1937-01-13
BE394625A (en) 1933-03-31
GB399469A (en) 1933-09-27
AT144599B (en) 1936-02-10

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