The scan lines are the vertical resolution of the system; for example, an NTSC TV signal uses 525 lines, 480 of which contain image data ("active" scan lines) and 45 are the vertical blanking ...
Also called "refresh rate," vertical scan frequency is the number of times a CRT was redrawn per second. Measured in Hertz, CRTs ranged from 56 to over 100 Hz, but at least 70 was recommended to ...
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