What does Jitter sound like?

First off wantd to congratulate soem of our members here for their incisive and descriptive talents.
It has been propven without a doubt that Jitter is very perjudicial to our music, there was a test done in which a panel of well versed and auditioned audiophile and musicians listened for a litle while to a CD of first cut recording direct (to avoid missinterpretaions or wrong intent) then to listen to the same part of music but the 100th generation of recorded music on CD as well.
Same data, same bits no data error, same thing, what was the differnece between those two recordings?
you guessed it!!! much Jitter, not enough to trow you off but enough to sound degraded and lacking compared to the 1st generation recording, that point established i can tell by own experience that i have heard lossles compresion played on a Macintosh computer through a $150 USB DAC into a Audible Illusions modded preamp into Quicksilver Audio monoblocks into Vandersteen speakers sounded A LOT!!! better than a very good source of playing the same CD version going though a Benchmark media or Classé DAC going though the same pipelines.
So even though MP-3 is sonically inferior to 16 Bits also 16 bits are very rudimentary when compared to 24 bits 96 Khz or 192 KHz material.

That is my 2 cents here.
Losless compression might be the way to go for playback, still discs are required for portability and to take it to your car, boat, aprty or friends house ofr a listen to his/her new toys, etc.

Also when evaluating new components or speakers this still is the batter way to go.
Long like to CD's thank God DVD audio is here also. . .

God Bless!

gonzalo

Gonzalo,

In Digital copy generations, there is no more Jitter in the 2nd generation than there is in the 100th generation, since every time you repeat the loop you go back to the hard disc and all the Jitter that the laser added is again gone. Jitter only has meaning during the real-time ADC procedure or the real-time ADC procedure. Other than that, you can send Digital files to CD's, Flash Drives, up to the Mars Rovers and back again, and then burn your CD and it will have the same amount of Jitter if burned under the same circumstances as your first copy.

Actually, many people burn copies of CDR's because they are making a copy which is even BETTER than the original white CD, because after they burn it, the CD playback mechanism reads it (for various reasons) with less Jitter, given a signal to the DAC with less Jitter, which sounds better.

These various reasons include the substrate material, reflections, focussing, vibrational issues, etc.

Liudas

Liudas,

True. Physically Jitter can ONLY exist once there is some form of clock or timing device...so a CD cannot have any jitter, however, if there is difficulty for a CD player to read a disc then perhaps oscillations in the drive motor power or lens focussing power might somehow cause the clock to be in error or more jittery (say for example they share the same power supply which happens to oscillate due to lens motor fluctuations, as it struggles to read a warped or uneven disc).

Shardorne, yes, you are right. I'm not too sure about the warped or uneven disc causing Jitter, though. My extensive experimentation shows that it is not this slow visible-to-the-eye movement of the lens which causes the Jitter one hears. Indeed, you can even put your finger onto a turning disc and you can cause a lot of low-frequency vibrations that way, but it isn't audible. What is audible then is if you go too far and cause a digital error. But Jitter itself is of a much more high frequency nature, as you say, such as from electronic oscillations and RF noise induction and the like.

Liudas

Shadorne - the positions of the pits in the CD are a form of timing information that can cause jitter as they are read. How this affects the PLL/buffering in the CD player depends on the design of the CD player. It is evidently important though. Rewriting a disk on CD-R with low jitter is an audible improvement on virtually all CD players I have tried. I mod a LOT of transports and players, so I get to try many different ones. This is good evidence that the pit locations are actually important.

Steve N.
Empirical Audio