Ok, thanks to Mtrycrafts, I have recieved and reviewed the Dolby Labs paper. I thought it would be appropriate to share it here. However, I will make it clear that the Dolby test, while using better methodology then most of the jitter audibility papers I have read, is not up to the standards required for accurate results, IMO. The test used a dial connected to jitter variation device and a reference signal. The test subject adjusted the jitter dial and A-Bed their supposed just noticable difference threshold. While this is a perfectly valid method to establish baseline values in a preliminary test -- this should have been followed up with a DBT in order to confirm these thresholds. It is then of my opinion that it is unfortunate that the test did not follow up, as in other aspects it as an otherwise excellent paper.
Here are cropped charts/tables of the results from the listening test:
Theoretical and Audible Effects of Jitter on Digital Audio Quality
Benjamin, Eric; Gannon, Benjamin
AES Preprint: 4826
As I expected, pure tones were easier to identify by a significant margin in most cases.
The musical selections(except the bachbusters) are noted as being of a single isolated instrument note because full spectrum, dynamic music made the jitter much harder to detect. The bachbusters is a syntheisized music, and the sample consisted of few notes. The raised thresholds stated being present in full spectrum, dynamic music program by Dolby is consistent with the preliminary DBT test findings mentioned in:
A Jitter Simulator on Digital Data
Ashihara, Kaoru; Kiryu, Shogo
AES Preprint: 5390
None of the results in this Dolby Labs study begin to approach the low psec range indicated as audible from the paper referenced by the author of the AH article . But again, I reiterate, that I have read references to such low sensitivies using special high frequency modulations at high amplutides.
I welcome any perceptual research references on this subject that anyone may be able to direct me towards.
-Chris
