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Posted by Richard Crowley on 06/20/06 01:20
"Gary Eickmeier" wrote ...
> The audio is recorded as digital information right in the same track as
> the video. If the video plays back fine, even at LP speed, I just want to
> know what happened to the audio. Digital audio is very robust in its error
> correction and masking. Should be some redundant bits somewhere in there,
> or some CIRC scheme to recover lost data.
According to the diagrams I've seen (online and elsewhere),
for each diagonal "swipe" of the rotating head, the video info
is recorded in the first part (~90%?) of the track, and the
audio, timecode, etc. data in the remaining part. It is this
trailing edge of the diagonal stripes (physicaly at the bottom
of the tape) which appear to be more vulnerable to mis-
tracking problems. It seems reasonable that mis-tracking
of this type will show up in the audio before you start seeing
"blocking" or "pixelization" symptoms of dropouts in the
video parts of the recording.
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