CCIR System N
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Short description: 625-line analog television transmission format
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.
Specifications
The general System N specifications are listed below.[6][4]
- Frame rate: 25 Hz
- Interlace: 2/1
- Field rate: 50 Hz
- Lines/frame: 625
- Line rate: 15625 Hz
- Visual bandwidth: 4.2 MHz
- Vision modulation: Negative
- Preemphasis: 75 μs
- Sound modulation: FM
- Sound offset: +4.5 MHz
- Channel bandwidth: 6 MHz
See also
- PAL
- PAL-N
- Broadcast television systems
- Multichannel television sound
- Pan-American television frequencies
Notes and references
- ↑ Sony Corporation (2014). "Help Guide | On TV color systems". https://www.sony-asia.com/microsite/cybershot_userguides/DSC-H400/en/contents/TP0000234067.html.
- ↑ 2.0 2.1 2.2 Iazbec; Soria; Tulli; Gonzalez (1999) (in es). Estudio de las tecnicas de transcodificacion de señales de television PAL-B / PAL-N. 10. Centro de Informacion Tecnologica. pp. 341–349. https://books.google.com/books?id=UGTKzPeALYYC&dq=PAL-N+%28Argentina%2C+Paraguay+and+Uruguay%29&pg=PA341.
- ↑ Trappe, Raffael Amadeus (2005). "Worldwide TV Systems (NTSC, PAL, and SECAM)". http://www.paradiso-design.net/TVsystems_worldwide.html.
- ↑ 4.0 4.1 Pemberton, Alan (August 30, 2012). "World Analogue Television Standards and Waveforms - CCIR Transmission Systems". http://www.pembers.freeserve.co.uk/World-TV-Standards/Transmission-Systems.html#CCIR.
- ↑ RECOMMENDATION ITU-R BT.470-6 -CONVENTIONAL TELEVISION SYSTEMS. ITU-R. 1998. https://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.470-6-199811-S!!PDF-E.pdf.
- ↑ Reference Data for Radio Engineers, ITT Howard W.Sams Co., New York, 1977, section 30
External links
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