CCIR System C
CCIR System C (originally known as the Belgian 625-line system) is an analog broadcast television system[1] used between 1953 and 1978[2] in Belgium, Italy, Netherlands and Luxembourg as a compromise between Systems B and L. Used on VHF only.[3]
Specifications
Some of the important specifications for System C are listed below:[4][3][1][5]
| Frame rate | Interlace | Field rate | Line/frame | Line rate | Visual b/w | Vision mod. | Preemphasis | Sound mod. | Sound offset | Channel b/w | Assumed display device gamma | Usual color system |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 | 2/1 | 50 | 625 | 15625 Mhz | 5 MHz. | Positive | 50 μs | AM | +5.5 MHz. | 7 MHz. | 2.0 | none |
Plan showing VHF frequency ranges for ITU Systems
Television channels were arranged as follows:[2]
| Channel | Video carrier (MHz) | Audio carrier (MHz) |
|---|---|---|
| 1 | 41.25 | 46.75 |
| 1A | 42.25 | 47.75 |
| 2 | 48.25 | 53.75 |
| 2A | 49.75 | 55.25 |
| 3 | 55.25 | 60.75 |
| 4 | 62.25 | 67.75 |
| 4A | 82.25 | 87.75 |
| 5 | 175.25 | 180.75 |
| 6 | 182.25 | 187.75 |
| 7 | 189.25 | 194.75 |
| 8 | 196.25 | 201.75 |
| 9 | 203.25 | 208.75 |
| 10 | 210.25 | 215.75 |
| 11 | 217.25 | 222.75 |
| 12 | 224.25 | 229.75 |
Notes and references
- DOCUMENTS OF THE Xlth PLENARY ASSEMBLY - OSLO, 1966 - VOLUME V - SOUND BROADCASTING TELEVISION (PDF). INTERNATIONAL TELECOMMUNICATION UNION. 1967.
- "World Analogue Television Standards and Waveforms". August 30, 2012. Archived from the original on 30 August 2012.
- "World Analogue Television Standards and Waveforms". August 30, 2012. Archived from the original on 30 August 2012.
- Reference Data for Radio Engineers, ITT Howard W.Sams Co., New York, 1977, section 30
- "C.C.I.R. Report 624-4 Characteristics of television systems, 1990" (PDF).
External links
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.