CCIR System C

625-line analog television transmission format

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: 25 Hz
  • Interlace: 2/1
  • Field rate: 50 Hz
  • Lines/frame: 625
  • Line rate: 15625 Hz
  • Visual bandwidth: 5 MHz
  • Vision modulation: Positive
  • Preemphasis: 50 μs
  • Sound modulation: AM
  • Sound offset: +5.5 MHz
  • Channel bandwidth: 7 MHz
  • Assumed display device gamma: 2.0
Plan showing VHF frequency ranges for ITU Systems

Television channels were arranged as follows:[2]

System C 625 lines
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

See also

Notes and references

  1. ^ a b DOCUMENTS OF THE Xlth PLENARY ASSEMBLY - OSLO, 1966 - VOLUME V - SOUND BROADCASTING TELEVISION (PDF). INTERNATIONAL TELECOMMUNICATION UNION. 1967.
  2. ^ a b "World Analogue Television Standards and Waveforms". August 30, 2012. Archived from the original on 30 August 2012.
  3. ^ a b "World Analogue Television Standards and Waveforms". August 30, 2012. Archived from the original on 30 August 2012.
  4. ^ Reference Data for Radio Engineers, ITT Howard W.Sams Co., New York, 1977, section 30
  5. ^ "C.C.I.R. Report 624-4 Characteristics of television systems, 1990" (PDF).

External links

  • World Analogue Television Standards and Waveforms
  • Fernsehnormen aller Staaten und Gebiete der Welt[permanent dead link]
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