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All Forums > Tech Talk > Tech Talk Forum Page 64 > little white slave girl 1 problem
AuthorPost
SEARGANT SHARP
Member


216 Posts
8/02
Posted - May 29 2003 : 9:56AM
Every once in awhile I can hear some vibration coming
from the DvD player when I go to the menu section.I
don't have any vibration when I play the movie.I have
the other LWSG discs but don't have any problems with
them.The vibration gets louder if the player has been
on for awhile but if I just turn the machine on you
from a cold start you can hardly even hear it make a
noise but unfortunately for me if I hear something even
barely audible I'm going to hear it.The player is a 2yr
old JVC machine I picked up on sale at circus city for $250
so it's not a cheap machine I don't remember the make number
but it's called an AV COMPU LINK.
GaySatyr
Senior Member

Half dirty ol' man; half horny ol' goat!
1684 Posts
10/00
Posted - May 29 2003 : 10:56AM
If it happens only with this particular DVD, then possibly the DVD is marginally off-center or very slightly warped. It is possible that the vibration would not be noticeable during normal play or on first loading to the menu but is exacerbated by a high-speed search such as returning to the menu in the middle of play.

Just a guess....

~ GaySatyr

Flash All-Star Supporter
Golden Age Classic

11018 Posts
5/01
Posted - May 29 2003 : 2:40PM
It also could be some extra material on the label in one area that causes it to happen. I have an older JVC XV-511 (which also has the AV Compu Link cabability) and this sometimes happens with it, about only one disc in 70 is effected though.
SyberScott
Senior Member

1462 Posts
1/03
Posted - May 29 2003 : 5:36PM
I've also noticed abnormal buzzing sounds
cumming out of my DVD player with certain
discs from various porn companies. I know
it can't be the player as most of my other
DVDs hardly make any noise at all.


ziniaraya
Member

London
194 Posts
4/03
Posted - May 29 2003 : 6:08PM
Just another vote that you're not alone. Happens on any type of disc, mainstream or adult. Just the odd one, every now and then.

I serviced the machine (smack the machine on top with a house slipper), but it don't make no difference. Therefore, since fixing the machine don't solve the problem, it must be the disc.

Z.

 
SEARGANT SHARP
Member

216 Posts
8/02
Posted - May 29 2003 : 6:09PM
Is it all brands or just JVC?
ziniaraya
Member

London
194 Posts
4/03
Posted - May 29 2003 : 6:24PM
My machine is not JVC so the problem is not so limited.

Z.

Sir Noel Plum
Senior Studmuffin

1001 Posts
2/03
Posted - May 29 2003 : 6:41PM
They always say 'don't stick anything on the disc bla bla bla' but I'd ignore it and attach a small sticker to the disc, maybe something like an inch square sticky label. If we are talking about a vibration issue the harmonic characteristics will have to accurately match the rotation speed; change one and resonance or vibration may well cease.

I actually studied 'acoustics engineering and vibration' at university and most of these problems, even in industry, are typically solved through 50% theory and 50% 'suck it and see' type experimentation. Attach label, play disc: if it works leave label on, if it doesn't remove label and try something else.

SNP.

Sir Noel Plum
Senior Studmuffin

1001 Posts
2/03
Posted - May 29 2003 : 6:57PM
Just to pick up on Gaysatyrs' response. I assume DVDs are like cds' and the angular velocity changes to guarantee a constant information rate as you scan through the disc. This means that when the player reads the inside track the disc is spun far quicker than when playing the outside track of the disc (unlike a vinyl record player which maintains a constant angular velocity throughout). Most resonance issues would clearly only show at a certain rotation speed which I think explains why one part of the disc (the menu) exhibits the behaviour and no other. This is akin to an unbalanced car wheel that causes vibration within the vehicle at a set frequency of rotation and set of conditions (say, a steady 70mph). Further, it may well be that other discs exhibit this behaviour on other parts of the disc, but because it does not occur on such a critical part as the menu and no doubt is passed through relatively quickly it has less of an effect and has gone unnoticed.

The fact the player exhibits the effect more when it is warm suggests to me one of two things:
1) the player is part of the resonating system and it is only when it is warm that (for whatever reason) the resonance frequency matches the disc frequency of the menu.
2) The player itself is acting like a sounding board for the resonating disc.

Either way, take the cover off your player and try tightening (or even loosening) a few screws, wedge some foam or rubber blocks onto bits that don't get too warm or do anything else safely that may change the ability of the player to resonate either as part of a system with the disc or to 'sing' in sympathy.

SNP.

Sir Noel Plum
Senior Studmuffin

1001 Posts
2/03
Posted - May 29 2003 : 6:59PM
PS:
It is always possible that by curing the problem of this disc though, you cause other discs to start doing the same thing
SEARGANT SHARP
Member

216 Posts
8/02
Posted - Jun 3 2003 : 10:45AM
Hey there
Well I tried the disc on a Samsung DvD player and it
didn't make any noise and I played it for at least 25
minutes.I'm going to try it on a higher end player to
also see if it makes any noise I'll keep you guys posted.
GaySatyr
Senior Member

Half dirty ol' man; half horny ol' goat!
1684 Posts
10/00
Posted - Jun 3 2003 : 11:04AM
As Sir Noel pointed out, disc vibration is a synergistic phenomenon. It requires something about the disc itself to be very marginally imperfect (i.e., off-center, warped, out-of-balance, or whatever) and a drive mechanism "tuned" to the problem (i.e., exact rotational speed, mechanical damping imperfections, temperature, et cetera).

I have one DVD that plays perfectly in my Sony changer (where I would expect problems to happen) which vibrates in both my Sony and my Sampo single-DVD players. But, then, the Sony changer plays the disc vertically whereas the two single-disc players have horizontal mechanisms.

~ GaySatyr




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