On 05/08/2012 04:25 AM, J. Forster wrote:
The SMPTE Time Code was on one line in first 20 odd of the Verticle
Blanking Interval (VBI), along with the Color Bars, Multiburst, Closed
Captrion data and some other things.
It was not accurate to microseconds. It had a format of HH:MM:SS:FR
(Hours, Minutes, Seconds, Frame) ... the frame was a number of 1 to 30
SMPTE 12M Time code doesn't have to be very accurate in the labeling, as
you for VITC has line-numbers and for LTC has the modulation. All
allowing for locking up analogue video and audio tape recorders.
For modern times, approaches using GPS based time to form a form of
absolute phase has been attempted, using the SMPTE 404M definition of a
SMPTE Epoch (definition of all phases aligned). The SMPTE 404M had a bug
in it when it was initially pre-published, it failed to detail which
time-zone that midnight 1 Jan 1958 was on, but they corrected it after
my comment on it.
Cheers,
Magnus
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