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Posted by Harry Kiri on 10/25/72 11:32
"Gary Eickmeier" <geickmei@tampabay.rr.com> wrote in message
news:CMaff.6856$bx3.3534@tornado.tampabay.rr.com...
>
>
> Harry Kiri wrote:
>
> > "Gary Eickmeier" <geickmei@tampabay.rr.com> wrote in message
> > news:Lr1ff.8867$dT3.2867@tornado.tampabay.rr.com...
> >
> >
> >>Anyone else experience this nonsense? The camera will record and
> >
> > play
> >
> >>back now, but I can't get ANY sound out of it if I put it in a
> >
> > standard
> >
> >>(i.e. new) Sony camera, especially at LP speed. It will play some
of
> >
> > my
> >
> >>older tapes, recorded when new, at SP, but no LP.
> >
> >
> > I wonder if LP problems arise because the capstan controller can't
> > keep the speed within such tight (percentage) limits at LP at it
does
> > at SP? On the other hand, at LP the drum would have to rotate at a
> > lower speed too, so the voltages induced in the heads should
> > theoretically be significantly lower, (flux change/unit time
reduces),
> > and if the induced head voltages approached the "not permitted"
> > voltage levels (in the threshold area between a 0 and a 1), then
you
> > would get a rubbish data stream off your tape that no amount of
error
> > correction will fix.
> >
> > Hypothesis and conjecture, of course. Needs someone with a bit
more
> > cam knowledge to contribute.
>
> The greatest mystery is that thru all of this, the video tracked
just
> fine. Even tracks the LP tapes that have no sound. So how can we
track
> the video part of the scan and not the audio? It's all recorded in
one
> rev of the head drum, and it's all digital.
>
> Gary Eickmeier
Yes, that remains to be discovered. I've not been able to find a
description of the miniDV recording method so I'm not sure of the
relationship between video, audio, parity and camera data (ie. camera
settings and time/date etc) as it is transferred to the media.
However I did run another test, using another camera and firewire to
do a transfer of a known good master across to the VX2000. The
results were exactly the same as when running it in camera mode. Lots
of audio dropout - the worst so far, it certainly isn't getting any
better with time! Without knowing what processing/decoding (I can't
think of any reason why it should be decoded) etc takes place from the
firewire input to the heads, this test is a bit academic of course.
Regards,
Hughy
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