What does Jitter sound like?

Stereophile test CD # 2 contains an example of jitter. Based on that example, jitter is very, very bad and you don't want it! One would have to wonder if that might not be the largest contributer to listener fatigue in digital systems. Dgarretson's first post above is an apt description of what you hear in the test CD example.

Dgarretson - Wow and flutter exhibit the same results as jitter, frequency modulation, so the answer is yes, although some jitter occurs at rates and changes in ways that a turntable could not physically do.

Steve N.

"My point was that there is no jitter added or lost by copying CD-R's many times (provided everything remains in the digital domain). The same is true for digital processing - it adds no jitter. ONLY a jittery clock or jittery signal makes jitter."

I agree with all of this. However, inaccuracies in the pit locations on the CD or CD-R contribute to the PLL clock jitter in the CD player. This has been demonstrated thousands of times. There were even several products that re-wrote CD's to get improved pit placement. They work with every CD player I have tried.

Steve N.

Brownsfan - As I have said in other posts, it is the PRIMARY deficiency that makes Digital Audio fatigueing, and is the single most significant flaw in the S/PDIF and CD format.

Steve N.

However, inaccuracies in the pit locations on the CD or CD-R contribute to the PLL clock jitter in the CD player

There is no PLL (Phase Lock Loop) used in a CD player unless it is getting its timing daisy chained down from some external device rather than its own internal clock (say an external SPDIF signal or TosLink signal, however this is not thee usual setup as youu are just using the CD players DAC).

Phase Lock Loops are used between devices in order to maintain synchronization ( for example a CD player and a DSP - the PLL in the DSP will keep in sync with the bit stream from the CD player - some PLL implementations can do a good job of reducing jitter )

Please refer to Page 207 of Nika Aldrich's book "Digital Audio Explained for the Audio Engineer" for an explanatin of a Phase Locked Loop (PLL). I strongly recommend this book to people unfamiliar with digital electronics (you don't need to be an EE to follow it).