CCIR System N
CCIR System N is an analog broadcast television system introduced in 1951 and adopted by Argentina, Paraguay and Uruguay (since 1980), paired with the PAL color system (PAL-N).[1][2][3] It was also used briefly in Brazil and Venezuela.
It employs the 625 line/50 field per second waveform of PAL-B/G, D/K, H, and I, but on a 6 MHz channel with a chrominance subcarrier frequency of 3.582056 MHz[2][4][5] (very similar to NTSC). On the studio production level, PAL-B cameras and equipment were used, with the signal then transcoded to PAL-N for broadcast.[2] This allows 625-line, 50-frame/s video to be broadcast in a 6-MHz channel, at some cost in horizontal resolution.
Specifications
The general System N specifications are listed below.[6][4]
| Frame rate | Interlace | Field rate | Line/frame | Line rate | Visual b/w | Vision mod. | Preemphasis | Sound mod. | Sound offset | Channel b/w |
|---|---|---|---|---|---|---|---|---|---|---|
| 25 | 2/1 | 50 | 625 | 15625 | 4.2 MHz. | Neg. | 75 μs | FM | +4.5 MHz. | 6 MHz. |
Plan showing VHF frequency ranges for ITU Systems
Television channels were arranged as follows:[7]
| Channel | Channel Limits (MHz) | Vision Carrier (MHz) | Main Sound Carrier (MHz) |
|---|---|---|---|
| A14/J13 | 470.00 - 476.00 | 471.25 | 475.75 |
| A15/J14 | 476.00 - 482.00 | 477.25 | 481.75 |
| A16/J15 | 482.00 - 488.00 | 483.25 | 487.75 |
| A17/J16 | 488.00 - 494.00 | 489.25 | 493.75 |
| A18/J17 | 494.00 - 500.00 | 495.25 | 499.75 |
| A19/J18 | 500.00 - 506.00 | 501.25 | 505.75 |
| A20/J19 | 506.00 - 512.00 | 507.25 | 511.75 |
| A21/J20 | 512.00 - 518.00 | 513.25 | 517.75 |
| A22/J21 | 518.00 - 524.00 | 519.25 | 523.75 |
| A23/J22 | 524.00 - 530.00 | 525.25 | 529.75 |
| A24/J23 | 530.00 - 536.00 | 531.25 | 535.75 |
| A25/J24 | 536.00 - 542.00 | 537.25 | 541.75 |
| A26/J25 | 542.00 - 548.00 | 543.25 | 547.75 |
| A27/J26 | 548.00 - 554.00 | 549.25 | 553.75 |
| A28/J27 | 554.00 - 560.00 | 555.25 | 559.75 |
| A29/J28 | 560.00 - 566.00 | 561.25 | 565.75 |
| A30/J29 | 566.00 - 572.00 | 567.25 | 571.75 |
| A31/J30 | 572.00 - 578.00 | 573.25 | 577.75 |
| A32/J31 | 578.00 - 584.00 | 579.25 | 583.75 |
| A33/J32 | 584.00 - 590.00 | 585.25 | 589.75 |
| A34/J33 | 590.00 - 596.00 | 591.25 | 595.75 |
| A35/J34 | 596.00 - 602.00 | 597.25 | 601.75 |
| A36/J35 | 602.00 - 608.00 | 603.25 | 607.75 |
| A37/J36 | 608.00 - 614.00 | 609.25 | 613.75 |
| A38/J37 | 614.00 - 620.00 | 615.25 | 619.75 |
| A39/J38 | 620.00 - 626.00 | 621.25 | 625.75 |
| A40/J39 | 626.00 - 632.00 | 627.25 | 631.75 |
| A41/J40 | 632.00 - 638.00 | 633.25 | 637.75 |
| A42/J41 | 638.00 - 644.00 | 639.25 | 643.75 |
| A43/J42 | 644.00 - 650.00 | 645.25 | 649.75 |
| A44/J43 | 650.00 - 656.00 | 651.25 | 655.75 |
| A45/J44 | 656.00 - 662.00 | 657.25 | 661.75 |
| A46/J45 | 662.00 - 668.00 | 663.25 | 667.75 |
| A47/J46 | 668.00 - 674.00 | 669.25 | 673.75 |
| A48/J47 | 674.00 - 680.00 | 675.25 | 679.75 |
| A49/J48 | 680.00 - 686.00 | 681.25 | 685.75 |
| A50/J49 | 686.00 - 692.00 | 687.25 | 691.75 |
| A51/J51 | 692.00 - 698.00 | 693.25 | 697.75 |
| A52/J51 | 698.00 - 704.00 | 699.25 | 703.75 |
| A53/J52 | 704.00 - 710.00 | 705.25 | 709.75 |
| A54/J53 | 710.00 - 716.00 | 711.25 | 715.75 |
| A55/J54 | 716.00 - 722.00 | 717.25 | 721.75 |
| A56/J55 | 722.00 - 728.00 | 723.25 | 727.75 |
| A57/J56 | 728.00 - 734.00 | 729.25 | 733.75 |
| A58/J57 | 734.00 - 740.00 | 735.25 | 739.75 |
| A59/J58 | 740.00 - 746.00 | 741.25 | 745.75 |
| A60/J59 | 746.00 - 752.00 | 747.25 | 751.75 |
| A61/J60 | 752.00 - 758.00 | 753.25 | 757.75 |
| A62/J61 | 758.00 - 764.00 | 759.25 | 763.75 |
| A63/J62 | 764.00 - 770.00 | 765.25 | 769.75 |
| A64 | 770.00 - 776.00 | 771.25 | 775.75 |
| A65 | 776.00 - 782.00 | 777.25 | 781.75 |
| A66 | 782.00 - 788.00 | 783.25 | 787.75 |
| A67 | 788.00 - 794.00 | 789.25 | 793.75 |
| A68 | 794.00 - 800.00 | 795.25 | 799.75 |
| A69 | 800.00 - 806.00 | 801.25 | 805.75 |
Notes and references
- "Help Guide | On TV color systems". www.sony-asia.com.
- Tecnologica, Centro de Informacion (January 19, 1999). "Informacion Tecnologica". Centro de Informacion Tecnologica – via Google Books.
- "Weltweite Fernsehsysteme (NTSC, PAL und SECAM)". www.paradiso-design.net. 2005. Retrieved 2023-03-06.
- "World Analogue Television Standards and Waveforms". August 30, 2012. Archived from the original on 2012-08-30.
- RECOMMENDATION ITU-R BT.470-6 -CONVENTIONAL TELEVISION SYSTEMS (PDF). ITU-R. 1998.
- Reference Data for Radio Engineers, ITT Howard W.Sams Co., New York, 1977, section 30
- "World Analogue Television Standards and Waveforms". August 30, 2012. Archived from the original on 2012-08-30.
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.