Subject: Re: [linux-audio-user] sampling at high frequencies
From: Joern Nettingsmeier (nettings_AT_folkwang-hochschule.de)
Date: Mon Jan 26 2004 - 13:35:22 EET
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.comJörn Nettingsmeier Kurfürstenstr 49, 45138 Essen, Germany http://spunk.dnsalias.org (my server) http://www.linuxaudiodev.org (Linux Audio Developers)
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