CCIR System L
{{Short description|625-line analog television transmission format}}
CCIR System L is an analog broadcast television system used in France, Luxembourg, Monaco and Chausey.{{cite book |url=https://search.itu.int/history/HistoryDigitalCollectionDocLibrary/4.277.43.en.1006.pdf |title=Documents of the XIth Plenary Assembly - Oslo, 1966 - Volume V - Sound Broadcasting Television |publisher=International Telecommunication Union |year=1967}}{{cite web |date=30 August 2012 |title=World Analogue Television Standards and Waveforms |url=http://www.pembers.freeserve.co.uk/World-TV-Standards/Transmission-Systems.html#CCIR |url-status=dead |archive-url=https://web.archive.org/web/20120830232230/http://www.pembers.freeserve.co.uk/World-TV-Standards/Transmission-Systems.html#CCIR |archive-date=30 August 2012 |website=}}{{cite web |date=2019 |title=Weltweite Fernsehsysteme (NTSC, PAL und SECAM) |url=http://www.paradiso-design.net/weltweite_fernsehsysteme.html |url-status=dead |archive-url=https://archive.today/20121209040135/http://www.paradiso-design.net/weltweite_fernsehsysteme.html |archive-date=9 December 2012 |access-date=2023-03-06 |website=www.paradiso-design.net}} It was the last system to use positive video modulation and AM sound.
Initially adopted in the 1970s and associated with the SECAM color system (SECAM-L), it was discontinued in 2011, when France transitioned to Digital Video Broadcasting.
Specifications
The main System L specifications are listed below:Reference Data for Radio Engineers, ITT Howard W.Sams Co., New York, 1977, section 30{{cite web |date=2007-05-15 |title=World Analogue Television Standards and Waveforms |url=http://www.pembers.freeserve.co.uk/World-TV-Standards/Transmission-Systems.html#CCIR |access-date=2023-04-13 |archive-url=https://web.archive.org/web/20070515044128/http://www.pembers.freeserve.co.uk/World-TV-Standards/Transmission-Systems.html#CCIR |archive-date=2007-05-15}}
- Frame rate: 25 Hz
- Interlace: 2/1
- Field rate: 50 Hz
- Lines/frame: 625
- Line rate: 15.625 kHz
- Visual bandwidth: 6 MHz
- Vision modulation: Positive
- Preemphasis: 50 μs
- Sound modulation: AM
- Sound offset: -6.5 MHz
- Channel bandwidth: 8 MHz
Television channels were arranged as follows:{{cite web |title=CCIR Systems - Radio Channels: System-L - France |url=http://www.pembers.freeserve.co.uk/World-TV-Standards/Transmission-Systems.html#L-France |url-status=dead |archive-url=https://web.archive.org/web/20120830232230/http://www.pembers.freeserve.co.uk/World-TV-Standards/Transmission-Systems.html#L-France |archive-date=30 August 2012 |access-date=12 January 2022 |website=www.pembers.freeserve.co.uk}}{{cite web |title=CCIR Systems - Radio Channels: Systems B, D, G, I, K, L 625 lines 7/8MHz, cable distribution, Europe |url=http://www.pembers.freeserve.co.uk/World-TV-Standards/Transmission-Systems.html#GHIKK1L |url-status=dead |archive-url=https://web.archive.org/web/20120830232230/http://www.pembers.freeserve.co.uk/World-TV-Standards/Transmission-Systems.html#GHIKK1L |archive-date=30 August 2012 |access-date=12 January 2022 |website=www.pembers.freeserve.co.uk}}
| class="wikitable" style="text-align: center; border-collapse:collapse"
|+ System L VHF channels ! Channel ! Video carrier (MHz) ! Audio carrier (MHz) |
| 1
| 47.75 | 41.25 |
| 2
| 55.75 | 49.25 |
| 3
| 60.50 | 54.00 |
| 4
| 63.75 | 57.25 |
| 5
| 176.00 | 182.50 |
| 6
| 184.00 | 190.50 |
| 7
| 192.00 | 198.50 |
| 8
| 200.00 | 206.50 |
| 9
| 208.00 | 214.50 |
| 10
| 216.00 | 222.50 |
| class="wikitable" style="text-align: center; border-collapse:collapse"
|+ System L UHF channels ! Channel ! Video carrier (MHz) ! Audio carrier (MHz) |
| 21
| 471.25 | 477.75 |
| 22
| 479.25 | 485.75 |
| 23
| 487.25 | 493.75 |
| 24
| 495.25 | 501.75 |
| 25
| 503.25 | 509.75 |
| 26
| 511.25 | 517.75 |
| 27
| 519.25 | 525.75 |
| 28
| 527.25 | 533.75 |
| 29
| 535.25 | 541.75 |
| 30
| 543.25 | 549.75 |
| 31
| 551.25 | 557.75 |
| 32
| 559.25 | 565.75 |
| 33
| 567.25 | 573.75 |
| 34
| 575.25 | 581.75 |
| 35
| 583.25 | 589.75 |
| 36
| 591.25 | 597.75 |
| 37
| 599.25 | 605.75 |
| 38
| 607.25 | 613.75 |
| 39
| 615.25 | 621.75 |
| 40
| 623.25 | 629.75 |
| 41
| 631.25 | 637.75 |
| 42
| 639.25 | 645.75 |
| 43
| 647.25 | 653.75 |
| 44
| 655.25 | 661.75 |
| 45
| 663.25 | 669.75 |
| 46
| 671.25 | 677.75 |
| 47
| 679.25 | 685.75 |
| 48
| 687.25 | 693.75 |
| 49
| 695.25 | 701.75 |
| 50
| 703.25 | 709.75 |
| 51
| 711.25 | 717.75 |
| 52
| 719.25 | 725.75 |
| 53
| 727.25 | 733.75 |
| 54
| 735.25 | 741.75 |
| 55
| 743.25 | 749.75 |
| 56
| 751.25 | 757.75 |
| 57
| 759.25 | 765.75 |
| 58
| 767.25 | 773.75 |
| 59
| 775.25 | 781.75 |
| 60
| 783.25 | 789.75 |
| 61
| 791.25 | 797.75 |
| 62
| 799.25 | 805.75 |
| 63
| 807.25 | 813.75 |
| 64
| 815.25 | 821.75 |
| 65
| 823.25 | 829.75 |
| 66
| 831.25 | 837.75 |
| 67
| 839.25 | 845.75 |
| 68
| 847.25 | 853.75 |
| 69
| 855.25 | 861.75 |
See also
Notes and references
{{reflist}}
External links
- [https://www.itu.int/dms_pub/itu-r/opb/rep/R-REP-BT.624-4-1990-PDF-E.pdf ITU, Characteristics of television systems]
- [https://web.archive.org/web/20120830232230/http://www.pembers.freeserve.co.uk/World-TV-Standards/Transmission-Systems.html World Analogue Television Standards and Waveforms]
- [https://archive.today/20121209040135/http://www.paradiso-design.net/weltweite_fernsehsysteme.html Fernsehnormen aller Staaten und Gebiete der Welt]
{{Video formats}}
{{Analogue TV transmitter topics}}
Category:ITU-R recommendations
Category:Television technology