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This page on NTSC vs PAL describes difference between NTSC and PAL.

NTSC stands for National Television System Committee. It works with vertical frequency of 60Hz and horizontal frequency of 15.734KHz with bandwidth of 6 MHz.

NTSC delivers 30 fps(frames per sec) with aspect ratio of 720 x 480 pixels. Widely used in North America, Japan and Koria. NTSC support video BW of 4.2 MHz.

PAL stands for Phase Alternation by Line. It works with vertical frequency of 50Hz and horizontal frequency of 15.625KHz with bandwidth of about 7-8 MHz.

PAL delivers 25 fps(frames per sec) with aspect ratio of 720 x 576 pixels. Widely used in Europe,Australia,Africa and Asia. PAL support video BW of 5 MHz. PAL signal can be decoded using two NTSC decoders.

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