26 Sep
2009
26 Sep
'09
2:28 a.m.
Fons.
Not really. Suppose you have to do this:
1. copy an audio track from a video recording,
2. do some work on it,
3. copy the result back to the video recording.
Your (nominal) sample rate is 48k, the video is
exactly 100s long when played at the exact frame
rate.
If the the clock used by the video equipment and your
sample clock are not coherent (not derived from the
same source), there will be a relative error between
them, both in steps 1 and 3.
If the source is analogue video (and analogue audio), you derive your
word clock from the VBI/video lines or SMPTE, if you have this information.
If the source is digital, well, there is no problem, since you work on a
fixed number of samples.
So please tell me how this can ever happen in real life?
Flo
--
Machines can do the work, so people have time to think.
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