CCIR System C explained

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

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

• CCIR System B
• CCIR System L
• Broadcast television systems
• Television transmitter
• Transposer

External links

• World Analogue Television Standards and Waveforms
• Fernsehnormen aller Staaten und Gebiete der Welt

Notes and References

1. Book: Documents of the XIth Plenary Assembly - Oslo, 1966 - Volume V - Sound Broacasting Television . International Telecommunication Union . 1967.
2. Web site: World Analogue Television Standards and Waveforms . August 30, 2012 . https://web.archive.org/web/20120830232230/http://www.pembers.freeserve.co.uk/World-TV-Standards/Transmission-Systems.html#BCF . 30 August 2012 . dead.
3. Web site: World Analogue Television Standards and Waveforms . August 30, 2012 . https://web.archive.org/web/20120830232230/http://www.pembers.freeserve.co.uk/World-TV-Standards/Transmission-Systems.html#CCIR . 30 August 2012 . dead.
4. Reference Data for Radio Engineers, ITT Howard W.Sams Co., New York, 1977, section 30
5. Web site: C.C.I.R. Report 624-4 Characteristics of television systems, 1990 .