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NTSC

National Television System Committee, also RS-170A

Colour TV standard used in the USA, Canada Japan and most countries of South America.

In the NTSC standard, an image comprises 525 lines. The 30 frames with an aspect ratio of 4:3 are divided into even and odd lines and transmitted at 60 fields per second (interlacing). This means that at the same data rate, the picture frequency appears to be doubled to the human eye and flicker is reduced. Interleaving of the brightness component and the colour component means that only one line or transmission channel is required for transmitting an NTSC signal (composite video).

In imaging and machine vision, a large number of 1-CCD colour cameras and 3-CCD colour cameras output an NTSC signal, although in this field the demands of image quality mean that better quality signals (Y/C, RGB) are generally used for further processing.

Technical features

  • Number of lines: 525 lines
  • Vertical frequency: 60 Hz
  • Horizontal frequency: 15.734 kHz
  • Video bandwidth: 4.2 MHz
  • Colour subcarrier frequency: 3.579545 MHz