Hi Eric!
I was also looking for answer to waveform assymmetry. Thanks for
explanation. Can you please explain further (or direct me to some source)
how harmonics cause assymmetry?
Pratap Singh
> From: "Rich Peet" <>
>> What causes a sound as seen on a waveform to go more positive or more
>> negative than centerline?
>
> Hi Rich!
>
> The waveform asymmetry is caused by the presence of even harmonics
> produced
> by whatever is making the sound. Human voice frequently exhibits such
> asymmetry. So do <a
href=3D"http://www.serverlogic3.com/lm/rtl3.asp?si=3D9&k=3Dbrass%20instrume=
nts"
onmouseover=3D"window.status=3D'brass instruments'; return true;"
onmouseout=3D"window.status=3D''; return true;">brass instruments</a>.
>
> I see that you are a CoolEdit user (OK, Adobe Audition). You can
> experiment
> with this effect by using the Generate; Tones menu, and generating a tone
> of
> say A 220 and its second harmonic at the same level as the fundamental
> (that
> is, both at 100%), and with a starting phase of 90 degrees. This will
> give
> you a strongly asymmetrical waveform. This is not unlike many sound
> sources
> in nature, where sometimes the fundamental is at a lower level than the
> harmonics.
>
> The last piece of info is that they asymmetry is audible. If you invert
> the
> waveform, it will sound different than if not inverted, at least with
> low-frequency sounds and with headphones.
>
> Eric
>
>
>
>
> "Microphones are not ears,
> Loudspeakers are not birds,
> A listening room is not nature."
> Klas Strandberg
> Yahoo! Groups Links
>
href=3D"http://www.serverlogic3.com/lm/rtl3.asp?si=3D9&k=3Dyahoo%20com";
onmouseover=3D"window.status=3D'yahoo.com'; return true;"
onmouseout=3D"window.status=3D''; return
true;">yahoo.com</a>/group/naturerecordists/
>
>
>
>
>
>
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