Bill,
On 02/01/14 20:33, Bill Hawkins wrote:
IIRC, the reason why NTSC has an almost 30 fps rate is that early
vacuum tube TV sets could develop heater-cathode leakage that
would put a black "hum bar" in the picture. Almost 30 allows the
bar to move through the picture in a 60 Hz power distribution
system. Seems like Europe would have had that problem.
No need for it now, but it's like the QWERTY keyboard . . .
Wouln't help that much, since the power-grids 60 Hz vary over more
frequency, than the 1/1.001 offset gives, which is about 59.94 Hz, and
over the coarse of a day it varies more than 60 mHz.
Cheers,
Magnus
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