I don't have time to do all the compares by display today but
thought that I would add how dolbe audition 1.0 handles the
conversion. Converted at the highest quality rate to 16 bit / 44.1
http://home.comcast.net/~richpeet/insect41khz.aif
Rich Peet
--- In Walter Knapp <>
wrote:
> From: Lang Elliott <>
> >
> >
> > Going the analog route, unfortunately, means playing each file
in real time.
> > I really can't afford to do that. ProTools will just have to do
for now.
> >
> > I wonder if enough folks in this group would like to have a copy
of my 48Khz
> > test file, which is an insect singing at around 12kHz. I think
it is really
> > demanding of any sample rate converter going to 44.1.
> >
> > Let me know if there's some interest and I'll post a wave file
on my web
> > site.
>
> 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("4","//madranis.home.mindspring.com/insect");">http:...
>
> I should note I also found a slight DC offset in the original, and
> removed that before conversion. DC offset introduces it's own
errors and
> I routinely remove that.
>
> Also, my system only outputs at 44k, so even listening to the
original
> it was already resampled. Spark and Peak played the original the
same.
> Sonograms showed in addition to the high frequency call centered on
> about 12khz a band at about 5khz (the raspy sound) and a bunch of
low
> level sound below 170hz. The sonogram of the peak conversion does
show
> some very low level sound below the 5khz band.
>
> Spark has batch capabilities, soundhack does not. I used best
settings
> in each, Spark was doing the math in 32bit floating point, not
sure on
> the others. Each has variations in settings available, and those do
> change the outcome.
>
> I have such lousy hearing at these high frequencies I was having to
> really boost volume. To me Peak and the original sound about the
same,
> but that could be my hearing. Spark is different. I also did
Soundhack
> as well, somewhere between peak and spark. I had my son listen to
them
> all, he can listen to the high frequency at normal listening
settings.
> He said there was little difference to him.
>
> Walt
>
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