[linux-audio-user] sampling at high frequencies

[Joern Nettingsmeier]

Erik de Castro Lopo wrote:
> On Mon, 26 Jan 2004 10:19:59 +0100
> Joern Nettingsmeier <nettings at folkwang-hochschule.de> wrote:
> 
> 
>>people can't hear over 20k. period. 48k sampling rate gives you 24k 
>>minus what's cropped off by the aliasing filter. 
> 
> 
> Thats not the full story. There was a Japanese study where untrained
> listeners could tell the difference between 10kHz sine waves and 10kHz
> square waves in double blind tests. That means that the listeners
> could tell presence or absence of the 30kHz third harmonic of the
> square wave.
> Theroretically this should not have been possible which indicates that
> theories of hearing perception are far from complete.

or there *may* have been aliasing or reproduction artifacts which 
provided clues to the listeners within the 20-20k range.

<babble type="not strictly scientific">

and even if they could tell a difference, this does not imply one was 
better or more hifi than the other - most people can hear the difference 
of a 192k mp3 and a 44k cd track, but i've yet to meet somebody who 
could always determine which is which, or even which of the two is better.

on my monitors, i can hear a 19k sine wave at 6db over my normal 
listening level. but: i'm 28 yrs old, and i've been doing about 20 gigs 
and/or mixing jobs a year at higher levels that i'm comfortable with for 
about 10 years. i really doubt my ears are still that good, and my guess 
is it's some artifact from the tweeters.

</babble>

ok, now i shut up :)
in any case, if you have papers on studies about this, send them over. 
it seems there is still much to learn.


-- 
"I never use EQ, never, never, never. I previously used to use mic
positioning but I've even given up on that too."
	- Jezar on http://www.audiomelody.com


Jörn Nettingsmeier
Kurfürstenstr 49, 45138 Essen, Germany
http://spunk.dnsalias.org (my server)
http://www.linuxaudiodev.org (Linux Audio Developers)