|
By the way, the scanning line structure of the analog picture samples the vertical resolution frequencies. 480 active lines (in NTSC) gives a practical limit of 330 lines per picture height of resolution without aliasing (and interlace flicker) getting too objectionable. This is a balanced spatial resolution for a 4x3 aspect ratio picture:
440 lines per width is the same physical spacing as 330 lines per height.
__________________
www.bretl.com
Old TV literature, New York World's Fair, and other miscellany
|