N

Noise

An unwanted signal produced by all electrical circuits. Noise cannot be eliminated but only minimized.

NTSC

American committee that sets the standards for color television as used today in the US, Canada, Japan and parts of South America. NTSC television uses a 3.57945 MHz sub-carrier whose phase varies with the instantaneous hue of the televised color, and whose amplitude varies with the instantaneous saturation of the color. NTSC employs 525 lines per frame and 59.94 fields per second.