4 ms·
The horizontal refresh rate (scanlines per second, how often the beam retraces horizontally) of NTSC video is indeed 15750 Hz, and PAL is 15625. Just about eve
by vikingerik 3y ago
The horizontal refresh rate (scanlines per second, how often the beam retraces horizontally) of NTSC video is indeed 15750 Hz, and PAL is 15625. Just about every CRT will emit some amount of audio at that frequency, and yes that's just at the upper end of the audible range for some (mostly young) humans.