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Distortion on vinyl rips (samples included)
meurglys0
post Dec 10 2011, 01:27
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There's a specific type of distortion I notice on many vinyl rips in circulation, but I cannot point out these flaws to the rippers (for constructive criticism), because I don't know what that type of distortion is called, that is if it has a specific name and I don't know how to describe them in words.

So I have put together two samples of such distortions from two different vinyl rips. I'd appreciate it if someone could tell me what this type of distoriton is called and what causes it. Thanks in advance.

Sample 1 is 13 seconds long and sample 2 is 20 seconds long. 3 mb in total. All title and id tag info are cleared from the files, so the files are anonymous.

On sample 1 the distortion becomes very apparent at the 6th second.
On sample 2 the distortion becomes very apparent at the 5th and 15th seconds.

Here's the link:
http://www.multiupload.com/KX1UT2DXV7

Regards.
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db1989
post Dec 10 2011, 14:45
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Divergent discussion about file-hosting services and archival software
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kennedyb4
post Dec 10 2011, 14:56
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QUOTE (db1989 @ Dec 10 2011, 09:45) *


Are these tracks near the end of the album? The information has to be packed more densely on the tracks near the end and this is also where the tracking distortion is more noticeable.

This post has been edited by kennedyb4: Dec 10 2011, 14:58
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Fedot L
post Dec 10 2011, 18:32
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QUOTE (kennedyb4 @ Dec 10 2011, 13:56) *
Are these tracks near the end of the album? The information has to be packed more densely on the tracks near the end and this is also where the tracking distortion is more noticeable.

On the tracks near the end of the album where the information has to be packed more densely on the tracks near the end and where the distortion is more noticeable, is called, since the “78 rpm” era, “tracing distortion”:

http://ddmal.music.mcgill.ca/wiki/Distorti...cing_distortion

Tracing distortion

All gramophones and phonograph media rotate at a constant angular velocity. However, the linear speed of the record groove moving past the stylus in gramophones is not constant. This speed is dependent upon the radial distance from the record center - the greater the distance, the greater the linear speed. As a result, similar sounds will have shorter wavelengths and greater curvatures on the inner grooves. Distortion introduced under these conditions is known as tracing distortion.
===

http://www.tronola.com/html/dynagroove.html

a significant amount of distortion as the ball-shaped tip attempted to trace the path cut by the chisel-shaped cutter stylus. This is called tracing distortion.
===

http://www.neumann.com/?lang=en&id=abo..._history_part_4

One interesting phenomenon in this connection is the tracing distortion that results from the difference in geometric shape between the tool used to cut the grooves and the playback stylus. The cutting stylus is shaped like a spade, while the playback stylus is spherical. During playback, this results in tracing distortion, which mainly contains the 2nd harmonic.
===

http://www.gearslutz.com/board/mastering-f...tion-vinyl.html

Almost all of the distortion comes from a thing called Tracing Distortion which is caused by trying to play back a groove made with a triangular cutting stylus by using a round (or rounded) playback stylus. As the groove get shaper (because of level or dimishing wavelength) you get more tracing error and more distortion.
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meurglys0
post Dec 11 2011, 00:05
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Sample 1 is the beginning of the second track on the album it comes from. The first track on the album is 3 minutes long.

Sample 2 is from the middle of the 4th song of the album it comes from, which correponds to the 15th minute or so on the album.

So can the distortion on these samples still be "tracing distortion" or does it only happen near the end of the album?

This post has been edited by db1989: Dec 11 2011, 15:42
Reason for edit: removing pointless full quote of huge preceding post
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