GB858277A - Improvements in or relating to colour television transmitting systems - Google Patents
Improvements in or relating to colour television transmitting systemsInfo
- Publication number
- GB858277A GB858277A GB945756A GB945756A GB858277A GB 858277 A GB858277 A GB 858277A GB 945756 A GB945756 A GB 945756A GB 945756 A GB945756 A GB 945756A GB 858277 A GB858277 A GB 858277A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- carrier
- signals
- sub
- wave
- 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
- H04N11/00—Colour television systems
- H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
- H04N11/12—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only
- H04N11/14—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system
Abstract
858,277. Television. ELECTRIC & MUSICAL INDUSTRIES Ltd. March 19, 1957 [March 27, 1956], No. 9457/56. Drawings to Specification. Class 40(3). In a colour television transmitting system for signals of the N.T.S.C. type in which the frequencies of the line and field synchronizing pulses and of the chrominance sub-carrier wave vary in response to variations in the frequency of electric supply mains the sub-carrier generator is controlled so that, in response to variations in the frequency of the supply mains, only discrete changes of frequency each of which results in a sub-carrier having a frequency which is an odd integral multiple of half line or half line and half field are possible. Known means may be employed to effect this control. Since, with such a system, the discrete changes of frequency may occur at any instant, intermittent phase reference signals (the "colour-bursts" of the N.T.S.C. system) are insufficient to ensure the production of rapid changes in the frequency of the local subcarrier generator in a co-operating receiver. To overcome this difficulty the system of the present invention utilizes, in addition to normal "colourburst" signals, a continuous reference carrier wave the frequency of which bears a predetermined relationship to the chrominance carrier wave. A receiver utilizing such a reference wave which comprises the sound carrier wave is described with reference to a "block" diagram (not shown). In this arrangement the sound and vision carriers are combined at I.F. frequency and by suitable division a wave of sub-carrier frequency is produced and employed as a conventional homodyning oscillation to recover the colour signals from the received chrominance sub-carrier. The "colour-burst" signals which are also transmitted being employed to control the phase of the (superheterodyne) receiver local oscillation. Since the frequency of the sound carrier wave is made to vary (at the transmitter) in accordance with the discrete changes in the frequency of the chrominance subcarrier wave constant synchronization of the homodyning oscillation results. Specifications 798,083, 798,084 and 849,622 are referred to.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL215655D NL215655A (en) | 1956-03-27 | ||
| GB945756A GB858277A (en) | 1956-03-27 | 1956-03-27 | Improvements in or relating to colour television transmitting systems |
| FR1173362D FR1173362A (en) | 1956-03-27 | 1957-03-26 | Improvements to color television transmitting systems and associated receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB945756A GB858277A (en) | 1956-03-27 | 1956-03-27 | Improvements in or relating to colour television transmitting systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB858277A true GB858277A (en) | 1961-01-11 |
Family
ID=9872335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB945756A Expired GB858277A (en) | 1956-03-27 | 1956-03-27 | Improvements in or relating to colour television transmitting systems |
Country Status (3)
| Country | Link |
|---|---|
| FR (1) | FR1173362A (en) |
| GB (1) | GB858277A (en) |
| NL (1) | NL215655A (en) |
-
0
- NL NL215655D patent/NL215655A/xx unknown
-
1956
- 1956-03-27 GB GB945756A patent/GB858277A/en not_active Expired
-
1957
- 1957-03-26 FR FR1173362D patent/FR1173362A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL215655A (en) | |
| FR1173362A (en) | 1959-02-24 |
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