GB562113A - Improvements in colour television systems - Google Patents
Improvements in colour television systemsInfo
- Publication number
- GB562113A GB562113A GB3672/43A GB367243A GB562113A GB 562113 A GB562113 A GB 562113A GB 3672/43 A GB3672/43 A GB 3672/43A GB 367243 A GB367243 A GB 367243A GB 562113 A GB562113 A GB 562113A
- Authority
- GB
- United Kingdom
- Prior art keywords
- colour
- circuit
- pulses
- signals
- phasing
- 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
- H04N9/00—Details of colour television systems
- H04N9/44—Colour synchronisation
Abstract
562,113. Colour te'evision; synchronizing. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. March 6, 1943, No. 3672. Convention date, June 28, 1941. [Class 40 (iii)] A colour television apparatus comprises a plurality of colour selective means repeatedly operative in a given colour sequence and phased by " colourphasing " signals, means causing the plurality of colour selecting means to operate in fixed phase relationship with respect to the " colour-phasing " signals but not necessarily in correct colour phase, means for generating " colourindicating " signals at times when the plurality of colour selecting means is in a predetermined position, and means responsive to the time relationship of the " colour-phasing " and " colourindicating " signals for causing the colour selective means to assume automatically the correct colour phase. In the apparatus shown, double interlaced scanning is used in conjunction with three successive colours. The three colours are selected in sequence by a colour wheel 16, Fig. 1, in the optical path between a scene 13 and an Iconoscope 10. The colour wheel is driven by a synchronous motor 31 locked-in with a synchronizing signal generator 17 by a lock-in circuit 62. The generator 17 may be as described in Specification 537,375. The synchronizing signal from the generator 17 controls the scanning operation of the Iconoscope 10 through the line 18 and the circuits 19, 21, 22, the production by a circuit 33 of a " colour-phasing " pulse 34 at every third frame and the production by a circuit 37 of a high frequency of 500 kc. A circuit 36 fed from the circuits 17, 33 serves to blank out at every third frame three of the narrow pulses 46, Fig. 4, of the frame pulses produced by the generator 17 ; a circuit 38 fed from the circuits 33, 37 serves to produce in place of the three blanked out pulses three trains 47, each comprising oscillations at the 500 kc. frequency generated by the circuit 37. The outputs of the circuits 36, 38 are combined and fed to the transmitter circuit 26, which also receives the image signal from the Iconoscope 10 through amplifiers 23, 24. The colour wheel 16 comprises two sets of three colours as shown in Fig. 2, and is formed with diametrically opposite notches 50, which produce pulses in a pick-up coil 51. These pulses constitute " colour-indicating signals and are fed through a transformer 52 to the grid of an amplifier tube 27, the anode of which is fed through a transformer 53 with the " colour-phasing " signal 34 generated by the circuit 33. The anode of tube 27 is connected to a rectifier 25 followed by a D.C. amplifier 30. The tube 27 is so biassed and its circuit so designed that when the " colour-indicating " and the " colour-phasing. " pulses coincide, the amplifier 30 passes no current through a solenoid 28, and the colour wheel remains clutched to the motor 31. If these pulses do not coincide, the tube 30 passes current, the solenoid 28 deflects a lever 56 and a clutch 29 allows the colour wheel 16 to slip relatively to the motor 31, whereby the colour wheel and the synchronizing signals are brought into correct colour phase. The circuits at the receiver operate in a similar manner, a pulse equivalent to the pulse 34 being extracted from the pulse trains 47 of the synchronizing signal.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US400173A US2378746A (en) | 1941-06-28 | 1941-06-28 | Color television system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB562113A true GB562113A (en) | 1944-06-19 |
Family
ID=23582508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3672/43A Expired GB562113A (en) | 1941-06-28 | 1943-03-06 | Improvements in colour television systems |
Country Status (2)
Country | Link |
---|---|
US (1) | US2378746A (en) |
GB (1) | GB562113A (en) |
Families Citing this family (60)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2734937A (en) * | 1956-02-14 | Television | ||
US2735886A (en) * | 1956-02-21 | Color television system | ||
US2429849A (en) * | 1945-09-15 | 1947-10-28 | Rca Corp | Color television system |
BE472522A (en) * | 1945-09-27 | |||
US2543015A (en) * | 1945-09-27 | 1951-02-27 | Standard Telephones Cables Ltd | Receiver circuit |
US2504734A (en) * | 1946-04-09 | 1950-04-18 | Internat Mutoscope Corp | Combined television viewing and recording apparatus |
US2538041A (en) * | 1946-04-30 | 1951-01-16 | Columbia Broadcasting Syst Inc | Color television |
US2509730A (en) * | 1946-05-01 | 1950-05-30 | Gen Electric | Synchronizing system |
US2502195A (en) * | 1946-05-01 | 1950-03-28 | Gen Electric | Synchronizing system |
US2509729A (en) * | 1946-05-01 | 1950-05-30 | Gen Electric | Synchronizing system |
US2525675A (en) * | 1946-05-07 | 1950-10-10 | Panoramic Radio Corp | Signal comparing system |
US2531834A (en) * | 1946-05-09 | 1950-11-28 | Rca Corp | Speed control system |
US2528510A (en) * | 1946-05-10 | 1950-11-07 | Columbia Broadcasting Syst Inc | Color television |
US2506437A (en) * | 1946-06-01 | 1950-05-02 | Bell Telephone Labor Inc | Combined voice and facsimile system |
US2479517A (en) * | 1946-06-08 | 1949-08-16 | Roy E Schensted | Color television apparatus |
US2535547A (en) * | 1946-09-10 | 1950-12-26 | Rca Corp | Telemetering system |
US2553182A (en) * | 1946-11-01 | 1951-05-15 | Cage Projects Inc | Color television |
US2535530A (en) * | 1947-01-09 | 1950-12-26 | Rca Corp | High-voltage supply for cathoderay tubes |
US2527967A (en) * | 1947-11-12 | 1950-10-31 | Rca Corp | Multiplex transmission of television signals |
FR958015A (en) * | 1947-12-27 | 1950-03-02 | ||
US2598504A (en) * | 1948-04-23 | 1952-05-27 | Times Facsimile Corp | Color picture transmission and reproduction |
US2580073A (en) * | 1948-05-01 | 1951-12-25 | Bell Telephone Labor Inc | Time multiplex television in color |
BE495723A (en) * | 1949-05-13 | |||
US2618701A (en) * | 1949-06-30 | 1952-11-18 | Columbia Broadcasting Syst Inc | Color television synchronizing |
US2627548A (en) * | 1949-09-10 | 1953-02-03 | Rca Corp | Color phasing system |
US2681946A (en) * | 1949-09-24 | 1954-06-22 | Rca Corp | Color image reproduction system |
US2703339A (en) * | 1950-02-03 | 1955-03-01 | Rca Corp | Television scanning system |
US2728812A (en) * | 1950-02-11 | 1955-12-27 | Rca Corp | Synchronizing system |
US2747013A (en) * | 1950-03-14 | 1956-05-22 | Color Television Inc | Polychrome television with color shift |
US2739181A (en) * | 1950-03-14 | 1956-03-20 | Color Television Inc | Line sequential color television apparatus |
US2594380A (en) * | 1950-04-01 | 1952-04-29 | Rca Corp | Synchronizing apparatus for color signal sampling oscillators |
US2653187A (en) * | 1950-04-04 | 1953-09-22 | Rca Corp | Synchronizing apparatus |
US2764148A (en) * | 1950-07-11 | 1956-09-25 | Sheldon Edward Emannel | Endoscope means for the internal examination of the human body |
US2709717A (en) * | 1950-11-10 | 1955-05-31 | Rca Corp | Color phasing in color television systems |
US2731511A (en) * | 1950-11-28 | 1956-01-17 | Wiesen Bernard | Color television systems |
US2724737A (en) * | 1951-01-29 | 1955-11-22 | Alsede W Hogan | Electric color image formation and control |
GB701751A (en) * | 1951-03-27 | 1953-12-30 | Pye Ltd | Improvements in or relating to colour television |
US2686219A (en) * | 1951-04-09 | 1954-08-10 | Rca Corp | Television system |
US2689880A (en) * | 1951-04-21 | 1954-09-21 | Columbia Broadcasting Syst Inc | Color television |
US2681379A (en) * | 1951-04-27 | 1954-06-15 | Rca Corp | Signal operated automatic color control circuits |
US2764149A (en) * | 1951-05-23 | 1956-09-25 | Sheldon Edward Emanuel | Electrical device for the examination of the interior of the human body |
US2676201A (en) * | 1951-06-18 | 1954-04-20 | Packard Bell Company | Color phase synchronization system for television |
FR1041809A (en) * | 1951-06-18 | 1953-10-27 | S E D A C Soc | New television process particularly applicable to the reception of color television images |
US2703340A (en) * | 1951-07-20 | 1955-03-01 | Walter Mellott | Color television system |
US2712568A (en) * | 1951-07-23 | 1955-07-05 | Rca Corp | Color synchronization |
US2671128A (en) * | 1951-07-31 | 1954-03-02 | Rca Corp | Microscopy system |
US2727941A (en) * | 1951-09-26 | 1955-12-20 | Du Mont Allen B Lab Inc | Color television system |
BE514249A (en) * | 1951-09-28 | |||
US2751430A (en) * | 1951-11-01 | 1956-06-19 | Rca Corp | Television color synchronization |
BE521553A (en) * | 1952-07-25 | |||
US2808454A (en) * | 1952-07-31 | 1957-10-01 | Rca Corp | Wave generating circuits |
US2829193A (en) * | 1952-09-26 | 1958-04-01 | Rca Corp | Color television synchronizing |
US2788390A (en) * | 1952-10-16 | 1957-04-09 | Sheldon Edward Emanuel | Device for examination of inaccessible parts |
US2845485A (en) * | 1952-11-13 | 1958-07-29 | Sheldon Edward Emanuel | Television camera for examination of internal structures |
US2686830A (en) * | 1953-01-15 | 1954-08-17 | Stromberg Carlson Co | Field recognition arrangement |
NL112270C (en) * | 1953-06-16 | |||
US2751431A (en) * | 1953-06-16 | 1956-06-19 | Rca Corp | Color television signalling apparatus |
NL291181A (en) * | 1962-04-05 | |||
US7348742B2 (en) * | 2004-11-23 | 2008-03-25 | Energy Focus, Inc. | Lighting fixture with synchronizable optical filter wheel and related method |
CN105676445B (en) * | 2016-03-24 | 2018-05-04 | 中国科学院光电技术研究所 | A kind of electronic optical filter wheel with electromagnetic clutch and arrestment mechanism |
-
1941
- 1941-06-28 US US400173A patent/US2378746A/en not_active Expired - Lifetime
-
1943
- 1943-03-06 GB GB3672/43A patent/GB562113A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2378746A (en) | 1945-06-19 |
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