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, standard PAL 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.
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PAL
Transcription
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. |
See also
- PAL
- PAL-N
- Broadcast television systems
- Multichannel television sound
- Pan-American television frequencies
Notes and references
- ^ "Help Guide | On TV color systems". www.sony-asia.com.
- ^ a b c 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.
- ^ a b "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
External links
This page was last edited on 27 June 2023, at 23:17