horizontal shifting during slow motion/still

[Randy S.]

On my new Panasonic PVVS4820, and on one JVC 3600 deck (both S-vhs), I
get a slight horizontal shift between frames during slow motion...
enough to be bothersome. On these decks, the still frame also has
some interlace flicker. The shift was non-existant on a different
3600, so I assume it's some kind of internal tracking adjustment
that's out.

Can someone tell me what this is, and if it's worth trying to have
techs try to fix (I still have 10 days to return for full refund).

thanks!

[Aaron]

Take it back and get another. And another. Keep going until you find one
that does slow motion the way you saw the other one doing and it also
doesn't eat or crunch tapes. You need to fast forward, rewind, play, record
at all speeds over a section of brand new tape and then open the door on the
tape by pushing the button on the side and make sure the tape has no
jaggedness whatsoever in the short direction on any part of the tape. Put
it back in the deck and then eject it back out right away and look again to
make sure the loading is not crunching the tape. If you find one that is
not defective then it will probably serve a useful life. Don't ever send it
in for service unless it's absolutely necessary because people have had
terrible problems with JVC techs, sending it in 5 times with it still
crunching on tapes. Get one that works right to start with and if you don't
find one then choose another deck and/or brand. JVC has terrible quality
control sometimes, especially with tape crunching, but I think their decks
are ok once you get one that's not defective.

Your slow motion problem could easily be due to tape crunching actually.
You better look at your tapes. Don't use any good tapes in any new JVC
until you've thoroughly tested it for tape crunching. Test it with a brand
new tape, though, so you can be sure it is not pre-crunched.

-Aaron

Randy S. <su...@execpc.com> wrote in message
news:393f0c84$0$95...@news.execpc.com...

[Moritz Ritter]

Hi

I'm exploring SDI 4:2:2 video data for my term thesis here at the swiss
federal
institute of technologie.

Since the Rec. ITU-R BT.601 and 656 specifications are that lose, there are
a few things left unclear about the scrambling algroithm:

1) The specification defines a scrambler with generating polynom (1+ x^4 +
x^9). Can anyone tell me, why this scrambler actually uses the bits of time
(t), (t-9) and (t-FIVE), instead of (t-4) what any convolutional codes
theory would sugest?! (It took me about a week to find out why pathological
signals don't work on my simulator!!)

2) Does anybody know when the scrambler register must be cleared? It seems
that any active line starts with a clear scrambler register, because that's
the only way the pathological signals work. Is this per chance? Is it
because there's no ancillary data? Or is it simply because the scrambler reg
has to be cleared at the start of every line? And if so, where else must it
be cleared?

Thanks a lot for any help

regards

Moritz Ritter

[Moritz Ritter]

[Rauf Siddiqi]

You can use the tracking buttom while pausing or slow advance frame to
do the adjustment.

-Rauf

In article <393f0c84$0$95...@news.execpc.com>,

su...@execpc.com (Randy S.) wrote:
> On my new Panasonic PVVS4820, and on one JVC 3600 deck (both S-vhs), I
> get a slight horizontal shift between frames during slow motion...
> enough to be bothersome. On these decks, the still frame also has
> some interlace flicker. The shift was non-existant on a different
> 3600, so I assume it's some kind of internal tracking adjustment
> that's out.
>
> Can someone tell me what this is, and if it's worth trying to have
> techs try to fix (I still have 10 days to return for full refund).
>
> thanks!
>

--
E-mail: sidd...@yahoo.com

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