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Topic ClosedPitch-correction for off=center vinyl?
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Progbear View Drop Down
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Points: 139 		Direct Link To This Post Topic: Pitch-correction for off=center vinyl?
    Posted: October 04 2005 at 01:19
I have a strange problem. I just got a copy of a rather rare album, Baltic Coast by the Estonian fusion group Radar. Showing typical Soviet-era ineptitude, this particular record is pressed slightly off-center, so the pitch wavers slightly.

Does anyone know of any software, or at least some sort of plugin, that I could use to correct the pitch on a .wav or .mp3 burned from the vinyl?
[IMG] http://www.denness.net/rpi/u/Progbear/fs/8/w/500/cp/2/s/5/si g.png">
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James Lee View Drop Down
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Points: 3525 		Direct Link To This Post Posted: October 04 2005 at 02:05
Wow! (sorry, bad joke but I couldn't resist)
 
None of the pitch correction software I know of would work...the quality of the results would be as inconsistent as the pitch of the original. They're mostly useless unless it's a monophonic signal.

Even a modulated pitch shift wouldn't work too well- even if you managed to lock it to the right time and pitch deviation for one revolution, it would be slightly off on the next. I suppose a real genius could devise an algorithm to compensate, if they knew the exact deviations of pitch over time.

You'd probably have more luck trying to re-drill and then reinforce the center hole so that the spindle doesn't slip into the old hole. I know I wouldn't dare it on a rare record, though...
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Points: 4097 		Direct Link To This Post Posted: October 04 2005 at 12:40
It's only mathematics really, to work out how much to correct at any given point. Ask the folk of www.hydrogenaudio.org, someone there might have an idea
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MikeEnRegalia View Drop Down
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Points: 21187 		Direct Link To This Post Posted: October 04 2005 at 13:07
The problem is that as the radius increases, the interval increases. so with each second of playback the interval needs to be adjusted. IMO it's not possible to keep the changes in sync with the deviations.
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Eetu Pellonpaa View Drop Down
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Points: 4828 		Direct Link To This Post Posted: October 04 2005 at 15:23

solution 1: Drill a big hole to the center, and you can then place the vinyl on the turn table freely, checking the right position from the turntable curves. I'm not sure how to do this properly, so there's a risk your precious LP is damaged severely!

solution 2: Take off the thingy from the turntable, where the LP is inserted, and rip the LP to wav or record it on a tape. Do this only, if you are sure you can replace the thingy. Risky!

solution 3 RECOMMENDED: Buy a used turntable, take the insertion thingy away, and use this "custom turntable" for this record only...

I wonder what thingy is in english? It's "nuppi" in Finnish...

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goose View Drop Down
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Points: 4097 		Direct Link To This Post Posted: October 04 2005 at 21:26
Originally posted by MikeEnRegalia MikeEnRegalia wrote:

The problem is that as the radius increases, the interval increases. so with each second of playback the interval needs to be adjusted. IMO it's not possible to keep the changes in sync with the deviations.
I still don't think it'd be that complex with maths...


Edited by goose
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James Lee View Drop Down
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Points: 3525 		Direct Link To This Post Posted: October 05 2005 at 02:04
Originally posted by Eetu Pellonpää Eetu Pellonpää wrote:

I wonder what thingy is in english? It's "nuppi" in Finnish...



mmm....thingy!

I believe the english translation is "spindle"? But I prefer the way "nuppi" sounds!
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Eetu Pellonpaa View Drop Down
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Points: 4828 		Direct Link To This Post Posted: October 05 2005 at 04:24
^ spindle [1: MOT English-Finnish 4.1]

spindle ['spɪndl] s 1 värttinä, kehrä ■ s 2 tekn kara, kehrä, teli ■ s 3 biol sukkularihmasto

I think it's correct! I meaned the small nut or knob on the turntable, where you insert the LP in a manner slighly resebling the this album cover:
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goose View Drop Down
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Points: 4097 		Direct Link To This Post Posted: October 05 2005 at 06:30
That could be a spindle on the picture, certainly
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Points: 2808 		Direct Link To This Post Posted: October 05 2005 at 10:58

I have nothing at all to add to this thread really but just wanted to say I really like the words

värttinä and sukkularihmasto

Finnish looks like its a cool language.

 
Proud to be an un-banned member since 2005
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