error correction et al'

sq225917 · 6th August 2007, 03:34 PM

I have a few lathed cd's that sound different to none lathed versions of the same disc, all new purchased discs..

now i don't believe for one minute that as the manufacturer claims it's to do with laser scatter or other eroneous ********.

but i can't deny the differnece in sound.

so. based on the fact that all it does is trim the disc to give you a better balanced cd that spins with less potential vibration. how does this chnage interact with the mechanism in the cd mech that serve to allow better disc tracking and error correction when apit can't be read?

do the electrical component of the laser assembly exist in perfect electrical isolation from the rest of the system, or not? if not how can any feedback manifest itself in reduced sound quality?

does reed solomon actually produce the 'lost bit' or does it just provide an approximation, and if so how close is this approximation. also does invoking reed solomon has any effect on data stream jitter?

please help, i'dloveto have an understanding of why a lathed cd sounds more spacious and ambient in my set up. i can pick the lathed version of several discs out over the none lathed version with 100% accuracy so i'm not just fooling myself into hearing a difference.

sq225917 · 6th August 2007, 09:50 PM

come on someone....

Werner · 7th August 2007, 05:24 AM

Quote:

Originally posted by sq225917

does reed solomon actually produce the 'lost bit'

Yes, up to a certain limit of read errors per block or whatever.
Beyond this data are interpolated. Such interpolation only happens
once in a while with an average disk.

Quote:

Originally posted by sq225917

also does invoking reed solomon has any effect on data stream jitter?

It is not invoked as such. The error corrector is a continuously-enabled block that takes in encoded and possibly damaged data and spits out decoded correct data.

sq225917 · 7th August 2007, 09:49 AM

thank you.

so any change can only be down to reduced electrical activity in the servo via a potentially better balanced disc?

analog_sa · 7th August 2007, 10:16 AM

Quote:

Originally posted by sq225917

so any change can only be down to reduced electrical activity in the servo via a potentially better balanced disc?

Maybe. It may also have something to do with the effect of pit jitter.

6th August 2007, 03:34 PM	#1
sq225917 diyAudio Member Join Date: Jun 2004 Location: sheffield	error correction et al' I have a few lathed cd's that sound different to none lathed versions of the same disc, all new purchased discs.. now i don't believe for one minute that as the manufacturer claims it's to do with laser scatter or other eroneous ********. but i can't deny the differnece in sound. so. based on the fact that all it does is trim the disc to give you a better balanced cd that spins with less potential vibration. how does this chnage interact with the mechanism in the cd mech that serve to allow better disc tracking and error correction when apit can't be read? do the electrical component of the laser assembly exist in perfect electrical isolation from the rest of the system, or not? if not how can any feedback manifest itself in reduced sound quality? does reed solomon actually produce the 'lost bit' or does it just provide an approximation, and if so how close is this approximation. also does invoking reed solomon has any effect on data stream jitter? please help, i'dloveto have an understanding of why a lathed cd sounds more spacious and ambient in my set up. i can pick the lathed version of several discs out over the none lathed version with 100% accuracy so i'm not just fooling myself into hearing a difference.

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6th August 2007, 09:50 PM	#2
sq225917 diyAudio Member Join Date: Jun 2004 Location: sheffield	come on someone....

7th August 2007, 09:49 AM	#4
sq225917 diyAudio Member Join Date: Jun 2004 Location: sheffield	thank you. so any change can only be down to reduced electrical activity in the servo via a potentially better balanced disc?