Re: Waveforms that are not symmetrical (still after corrected DC offset) -- question
- From: "Meindert Sprang" <ms@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 6 Jul 2007 09:19:29 +0200
<mjbaldwin@xxxxxxxxx> wrote in message
news:1183657828.322675.217330@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Really? So a 1-minute voice recording that seems to be about 50%
"heavier" on the bottom half of the waveform, consistently during the
entire recording, is natural? I'm not looking at the waveforms up
close, I'm talking about looking at a view of a whole minute on my
screen...
I think you mistake DC offset for signal asymmetry. If you would consider
the following signal, squared for simplicity:
Positive amplitude of 3V during 1 second, then a negative amplitude of 1V
during 3 seconds.
This signal will appear to have a DC offset when you look at a long stretch
of it, but it has no DC offset at all because both positive and negative
part have the same area (amplitude x time). Many natural sounds (voice,
instruments) have the same kind of signal, which is caused by the harmonics
of the fundamental frequency.
Meindert
.
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