How many horizontal lines make up a fast-scan (NTSC) television frame?
30
60
525✓الإجابة الصحيحة
1080
الشرح
A complete NTSC fast-scan frame is 525 horizontal lines, sent as two interlaced fields of 262.5 lines each. The numbers 30 and 60 are the frame and field rates in hertz, and 1080 belongs to a modern high definition format.