GB860341A - Improvements relating to colour television - Google Patents
Improvements relating to colour televisionInfo
- Publication number
- GB860341A GB860341A GB1097456A GB1097456A GB860341A GB 860341 A GB860341 A GB 860341A GB 1097456 A GB1097456 A GB 1097456A GB 1097456 A GB1097456 A GB 1097456A GB 860341 A GB860341 A GB 860341A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- limiter
- brightness
- brightness signal
- pentodes
- 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
- H04N11/146—Decoding means therefor
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
- Color Television Systems (AREA)
Abstract
860,341. Limiter circuits. ELECTRIC & MUSICAL INDUSTRIES Ltd. April 11, 1957 [April 11, 1956], No. 10974/57. Class 40 (6). [Also in Group XL (b)] A four-diode network 12-15 is employed to limit both the positive and negative half-cycles of a colour television sub-carrier signal (see Group XL (b)) at a level determined by a brightness signal EE which is applied via pentodes 16, 17 to vary the potential difference between points 20 and 24 in the network. The arrangement is such that the potential difference is zero for a maximum brightness signal and increases as the brightness signal decreases. The limiter characteristic is as shown in curve 28, the level portion 29 being brought about by saturation in the diodes. The subcarrier signal is applied to the limiter via a first cathode-follower 10 and the output is derived via a second cathodefollower 30. The brightness signal at the grids of pentodes 16 and 17 is restored during blacklevel intervals by clamps 26a, 26b. The subcarrier and brightness signals may exist initially as separate components in a television transmitter or receiver, or may be produced from a common set of colour-specifying signals by suitable signal processing circuits, Fig. 1 (not shown).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1097456A GB860341A (en) | 1956-04-11 | 1956-04-11 | Improvements relating to colour television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1097456A GB860341A (en) | 1956-04-11 | 1956-04-11 | Improvements relating to colour television |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB860341A true GB860341A (en) | 1961-02-01 |
Family
ID=9977736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1097456A Expired GB860341A (en) | 1956-04-11 | 1956-04-11 | Improvements relating to colour television |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB860341A (en) |
-
1956
- 1956-04-11 GB GB1097456A patent/GB860341A/en not_active Expired
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