525/60
525/60 refers to a NTSC analog TV signal. Although NTSC only has 486 horizontal lines in its Active Area, a NTSC video signal also includes extra vertical sync lines, which are basically just filler timed to allow the electron guns in a CRT television time to reposition themselves at the top of the screen. There are 39 vertical sync lines, resulting in a total of 525 lines (486 + 39).
60 is a reference to NTSC's Fieldrate of approximately 60 Fields per second, resulting in 29.97 (30 / 1.001) Interlaced frames per second.
Related Guides
Digital Video Fundamentals - Resolution and Aspect Ratio
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| Video Capture Cards with Analog Video Inputs |
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