GB413401A - Improvements in or relating to television systems - Google Patents
Improvements in or relating to television systemsInfo
- 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
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.
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)
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 |
-
1932
- 1932-02-27 GB GB592932A patent/GB399469A/en not_active Expired
-
1933
- 1933-02-07 GB GB3743/33A patent/GB413401A/en not_active Expired
- 1933-02-25 AT AT142478D patent/AT142478B/en active
- 1933-02-25 BE BE394625D patent/BE394625A/xx unknown
- 1933-02-27 FR FR752450D patent/FR752450A/en not_active Expired
-
1934
- 1934-01-11 FR FR44556D patent/FR44556E/en not_active Expired
- 1934-01-12 DE DEC48725D patent/DE640742C/en not_active Expired
- 1934-01-19 AT AT144599D patent/AT144599B/en active
Cited By (2)
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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