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>
> No. There is no difference in the waveforms. See my posts in
> povray.binaries.misc. Or download Adobe Audition demo version to try out
> for yourself.
Silly me! Of course there is no difference: the filters keep only the
fundamental, which is a sin at 20KHz! It's a triangular waveform, not a
sin waveform you have to use.
ARGH!
I'm starting to loose myself!
I can't remember how the test was supposed to be done!
Was it 20KHz or 22KHz? Was it a triangular or a square waveform?
(I can't test it myself: I use Linux and have no sound editing softwares
installed (I'll have to find one to try, but I will not be able to do
that before this WE...))
(I can't find p.b.m...)
>
> Please note that in [4] the scale goes from -32000 to 32000, so we are
> seeing an error of between 1 and 2 per 32000, ie -84dB. Theoretically there
> should be no error, but I had choose a quality setting when I upsampled in
> stage 2, so I'm sure that effects the result.
Well, In my opinion, this error is just a rounding error during the
conversions... It is not the one I was talking about.
>
> I can't hear the -84dB signal on my machine at work, I'll try it at home but
> I'd imagine I would need to have my amplifier up *far* higher than I do
> normally.
>
Well, if you can hear this signal, you have a really really really
hi-end audio system. Most of the signal/noise ratios are around 70-80dB,
so you might hear the amplifier's noise better that the signal.
Regards,
--
Laurent ARTAUD (lau### [at] free fr)
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