GB559005A - Improvements in and relating to television transmission - Google Patents
Improvements in and relating to television transmissionInfo
- Publication number
- GB559005A GB559005A GB12858/42A GB1285842A GB559005A GB 559005 A GB559005 A GB 559005A GB 12858/42 A GB12858/42 A GB 12858/42A GB 1285842 A GB1285842 A GB 1285842A GB 559005 A GB559005 A GB 559005A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulses
- tube
- synchronizing
- triode
- generator
- 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
- 230000005540 biological transmission Effects 0.000 title 1
- 230000001360 synchronised effect Effects 0.000 abstract 2
- 230000000694 effects Effects 0.000 abstract 1
- 238000005286 illumination Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
- H04N5/18—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit
- H04N5/185—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit for the black level
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
- Apparatus For Radiation Diagnosis (AREA)
- Particle Accelerators (AREA)
Abstract
559,005. Television. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Sept 11, 1942, No. 12858. Convention date, Jan. 31, 1941. [Class 40 (iii)] Disturbing effects of pulses 42, Fig. 2, produced by periodical illumination of screen 14, Fig. 1, of transmitter tube 10, are prevented by triggering off a D.C. reinserter 31 during the period of these pulses. In the arrangement shown, the transmitter tube 10 is a low-velocity tube, for example as described in Specification 540,281, with a scanning control electrode 11 supplied with synchronizing pulses from a generator 12 of synchronizing and blanking pulses. The images are projected on the screen 14 of the tube from a film 46 driven intermittently by a mechanism 45 as described in U.S.A. Specification 2,082,093. This mechanism is operated by a synchronous motor 49 supplied from the source 51, which also supplies the synchronizing-pulse generator 12. The signals produced by the tube 10 are amplified by the chain of valves 21, 22, 26. A triode 31 is connected to the grid of amplifier 26 and co-operates with the condenser 36 and the resistance 37 to reinsert D.C. into the signal as described in U.S.A. Specification 2,194,514. The grid of the triode 31 is connected to a keying-pulse generator 53 synchronized by blanking pulses from the synchronizing-pulse generator 12. The keying-pulses 54 produced by the generator 53 trigger-off the triode 31 during the period of the pulses 42. Blanking pulses, Fig. 3, are fed into the amplifying chain through a switch 57.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US376871A US2305902A (en) | 1941-01-31 | 1941-01-31 | Television transmission |
Publications (1)
Publication Number | Publication Date |
---|---|
GB559005A true GB559005A (en) | 1944-01-31 |
Family
ID=23486845
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB12858/42A Expired GB559005A (en) | 1941-01-31 | 1942-09-11 | Improvements in and relating to television transmission |
Country Status (2)
Country | Link |
---|---|
US (1) | US2305902A (en) |
GB (1) | GB559005A (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2485310A (en) * | 1946-12-12 | 1949-10-18 | Du Mont Allen B Lab Inc | Video black clipper |
GB652059A (en) * | 1948-06-03 | 1951-04-18 | Emi Ltd | Improvements relating to the generation of picture signals for television transmission |
GB688200A (en) * | 1948-07-15 | 1953-03-04 | Emi Ltd | Improvements relating to television transmitting systems |
US2584265A (en) * | 1949-05-10 | 1952-02-05 | Gen Precision Lab Inc | Film to television translator |
US2612552A (en) * | 1949-06-10 | 1952-09-30 | Zenith Radio Corp | Subscription type signaling system |
US2694103A (en) * | 1950-06-16 | 1954-11-09 | Zenith Radio Corp | Subscription television transmitter video-signal blanking stage |
US8724636B2 (en) * | 2008-03-31 | 2014-05-13 | Qualcomm Incorporated | Methods of reliably sending control signal |
-
1941
- 1941-01-31 US US376871A patent/US2305902A/en not_active Expired - Lifetime
-
1942
- 1942-09-11 GB GB12858/42A patent/GB559005A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2305902A (en) | 1942-12-22 |
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