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). 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 (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. 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. 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

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

ITU-R recommendations
Television technology
N, System
Broadcast engineering
CCIR System