44.1 vs 88.2 ABX report at AES Options

[2Bdecided]

Here:

http://www.aes.org/events/128/papers/?ID=2252

P18-6 Sampling Rate Discrimination: 44.1 kHz vs. 88.2 kHz—Amandine Pras, Catherine Guastavino, McGill University - Montreal, Quebec, Canada
It is currently common practice for sound engineers to record digital music using high-resolution formats, and then down sample the files to 44.1 kHz for commercial release. This study aims at investigating whether listeners can perceive differences between musical files recorded at 44.1 kHz and 88.2 kHz with the same analog chain and type of AD-converter. Sixteen expert listeners were asked to compare 3 versions (44.1 kHz, 88.2 kHz, and the 88.2 kHz version down-sampled to 44.1 kHz) of 5 musical excerpts in a blind ABX task. Overall, participants were able to discriminate between files recorded at 88.2 kHz and their 44.1 kHz down-sampled version. Furthermore, for the orchestral excerpt, they were able to discriminate between files recorded at 88.2 kHz and files recorded at 44.1 kHz.
Convention Paper 8101

Was anyone at the presentation? Has anyone bought the paper?

Cheers,
David.

[greynol]

160 KHz is a probable number, if a little high.

How can it be a little high when it is already lower than what you specify as to how these things are done?

So please, tell us, what is the point in a CD player having a lowpass at 160 kHz when the audio will never be above 22.05 kHz?

Sorry Arnold, but I don't think you know what you're talking about.

This post has been edited by greynol: Jul 17 2010, 21:12

[Arnold B. Kruege...]

160 KHz is a probable number, if a little high.

How can it be a little high when it is already lower than what you specify as to how these things are done?

?????????????

If I said something like that you'll have to quote it to me. I surely had no such intentions.

So please, tell us, what is the point in a CD player having a low pass at 160 kHz when the audio will never be above 22.05 kHz?

The corner frequency of the analog low pass is set high so that it doesn't cause losses in the pass band. It is usually a relatively simple filter with gentle roll-off.

The analog low pass relates to the oversampling frequency, not the sampling frequency of the data from the media.

If you take the time to read the reference I've already cited, they show how this works with detailed spectral analysis.

You must have missed the link the first time I posted it - here it is again: second Link to detail;ed technical data for an oversampling DAC including spectral analysis

This post has been edited by Arnold B. Krueger: Jul 17 2010, 23:04