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Re: Sample Rate Conversion

Subject: Re: Sample Rate Conversion
From: Walter Knapp <>
Date: Sun, 09 May 2004 15:15:13 -0400
From: Vicki Powys <>
> 
> Walt wrote about Lang's insect recordings:
> 
> 
>>> I've put up what I got off a copy of Lang's file:
>>> Peak 4.03:
>>> m("44khz_peak.aif","//madranis.home.mindspring.com/insect");">http:
>>> Spark XL 2.81:
>>> m("44khz_spark.aif","//madranis.home.mindspring.com/insect");">http:
>>> Soundhack (osX version 0.892):
>>> m("44khz_shak.aif","//madranis.home.mindspring.com/insect");">http:
>>> The original Lang sent me:
>>> m("48khz.aif","//madranis.home.mindspring.com/insect");">http:
> 
> 
> 
> I've downloaded these files and had a listen.  My hearing is fairly OK for
> higher frequencies.  I was listening through Sennheiser HD 570 headphones
> via my iMac.
> 
> The original sounded good
> Peak sounded quite a lot thinner than the original
> Soundhack sounded exactly the same as the Peak file
> Spark sounded noticably thinner than either Peak or Soundhack

I might should note here that the particular protocol you set for sound 
out has a significant effect on the sound you get. In OSX you have a 
choice in Peak of Core Audio (with some options), or two versions of 
Hal. At least in my G4. Depending on those settings my mac may play the 
original to sound just like the flawed peak file, or just like the spark 
file. And some settings don't work right at all.

Sounds like it's different in a iMac, we know from the discussion a 
while back that it's handling of resampling is quite different from my 
g4, but you might want to play with whatever settings you find in the 
Audio>Sound Out menu choice in Peak. Also check that against what the 
Quicktime Player gets.

Walt




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