On 3:55 Uhr David W. Fenton wrote:
The tools I downloaded all required me to play the file in some other
program in order to get the waveform (instead of reading it directly
from the file). This means that those programs were capturing the
output from my soundcard, which means that this output would include
the distortion introduced by the sound shape of my soundcard.
I very much doubt that. Spectrum Analysis is done in the digital, not in
the analogue. The software could capture the input from the soundcard,
but I doubt it could capture the output, since that is going out, not
in. It is possible, if unlikely, that the output is handed back to the
input of the sound card, but why on earth that would be the case is a
mystery to me.
I saw
it in the one application, where with no sound playing, there was
some very low level activity in the extreme ranges of low and high.
My suspicion is that the software was *adding* the input signal from the
audio card. You probably could have easily switched this off. I can
think of no other sensible explanation.
Hang on: Do you mean you were playing back "silence" and got activity?
That's normal, one always avoids to put complete silence ie between
movements, or before the start of the piece. Instead one records
"silence" in the recording room/studio. Such "silence" is not silent.
But it still has nothing to do with your sound card.
And, yes, to get a spectrum analyis you need to "play" your file (though
not necessarily in real time). A Waveform is static, but a spectrum
analysis can only exist in relation to "continuum".
Johannes
--
http://www.musikmanufaktur.com
http://www.camerata-berolinensis.de
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