Jitter Correction Enable/Disable

[klysengr]

I have a question concerning jitter correction. I'm using Cowon's
jetAudio 7.05.3040 basic to rip my CD's to flac files. Should I enable
the jitter correction in the configuration menu? Or leave it disabled?
It does increase the time to rip with it enabled. Is there an audible
difference that anyone has noticed?

klysengr

[seanadams]

It makes no sense, because there is no clock recovery involved in
ripping a CD. Is this feature documented?

[Pat Farrell]

Post by klysengr
I have a question concerning jitter correction. I'm using Cowon's
jetAudio 7.05.3040 basic to rip my CD's to flac files. Should I enable
the jitter correction in the configuration menu?

I've never believed in jitter. The audiophiles talk about it a lot, but
its not clear it exists in anything about radio shack gear

and never heard of rippling.

Have you looked at accurip?

[klysengr]

seanadams wrote: It makes no sense, because there is no clock recovery
involved in ripping a CD. Is this feature documented?

klysengr: All Cowon says, that it is for noise control. I'm ripping a
cd without it and will evaluate the music. By leaving jitter correction
disabled, the ripping speed is 4 to 5 times faster.

[radish]

I recommend you just use EAC. It's well understood and lots of people
here (and elsewhere) can help you with it. Plus, if you want perfect
rips it doesn't get any better than EAC.

[cliveb]

Sean and Pat have posted replies with respect to one use of the term
"jitter" - timing inaccuracies. And as Sean says, it is completely
irrelevant during CD ripping.

Unfortunately there is another use of the term "jitter", and this
refers to the inability of older CDROM drives to accurately position
within the data stream of an audio CD. (Quite why the same term was
used for this is a mystery to me - the word was already is widespread
use within the digital audio community, so it should have been obvious
that it would cause confusion). In this scenario, the term "jitter
correction" is a strategy used by rippers whereby blocks are read in an
overlapped manner, and the software matches up the boundaries in an
attempt to compensate for the inaccurate positioning.

However, the vast majority of modern CDROM drives do not have this
positioning problem, so there is no need for jitter correction. Try
ripping with it switched off. If your drive does require it, you'll
soon know - there will be obvious clicks and pops in your rips.

[klysengr]

Post by cliveb
Sean and Pat have posted replies with respect to one use of the term
"jitter" - timing inaccuracies. And as Sean says, it is completely
irrelevant during CD ripping.
Unfortunately there is another use of the term "jitter", and this
refers to the inability of older CDROM drives to accurately position
within the data stream of an audio CD. (Quite why the same term was
used for this is a mystery to me - the word was already is widespread
use within the digital audio community, so it should have been obvious
that it would cause confusion). In this scenario, the term "jitter
correction" is a strategy used by rippers whereby blocks are read in an
overlapped manner, and the software matches up the boundaries in an
attempt to compensate for the inaccurate positioning.
However, the vast majority of modern CDROM drives do not have this
positioning problem, so there is no need for jitter correction. Try
ripping with it switched off. If your drive does require it, you'll
soon know - there will be obvious clicks and pops in your rips.

Thanks for the input cliveb, your answer makes sense to me. I have
tried it without jitter correction and can't hear any difference. It
certainly is faster without it. Regards, klysengr

[Timothy Stockman]

Post by cliveb
Unfortunately there is another use of the term "jitter", and this
refers to the inability of older CDROM drives to accurately position
within the data stream of an audio CD.

Yes. In fact there are 3 "types" of jitter:

1. The DAC clock timing uncertainty Sean is talking about.
2. The CDROM seek uncertainty you mention.
3. The timing uncertainty of the transitions of the EFM "RF" signal
from the read head of the CDROM drive.

They all deal with uncertainty, (1) and (3) deal with timing
uncertainty, but they are three completely different things.