this article might also interest you :<div><a href="http://www.soundonsound.com/sos/Aug02/articles/synthsecrets0802.asp">http://www.soundonsound.com/sos/Aug02/articles/synthsecrets0802.asp</a></div><div><br></div><div>grtz</div>
<div>Thijs</div><div><br><br><div class="gmail_quote">2011/12/11 Fons Adriaensen <span dir="ltr"><<a href="mailto:fons@linuxaudio.org">fons@linuxaudio.org</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="im">On Sun, Dec 11, 2011 at 10:52:31PM +0100, Julien Claassen wrote:<br>
<br>
> This sounds valuable. My first experiments - mainly trial and error,<br>
> based on basic theory - weren't good at all. :-(<br>
<br>
</div>Depends on what you consider 'basic theory'. The simple fact is<br>
that the partials of a bell sound are _not_ a simple harmonic<br>
series. In its most basic form, a bell sound will consist of<br>
five partials:<br>
<br>
1. Nominal - this is the nominal frequency of the bell.<br>
2. Prime - one octave below the nominal.<br>
3. Hum - two octaves below the nominal.<br>
4. Tierce - a minor (sometimes major) third above the prime.<br>
5. Quint - a fifth above the prime.<br>
<br>
There will be higher components as well in many cases, in<br>
particular higher thirds and fifths, but these are never<br>
exact harmonics of the lower ones.<br>
<br>
This is a much simplified model. In most cases the two<br>
octaves are not exact (the 'hum' is usually higher) and<br>
this does not necessarily mean a bad sound. Same for the<br>
smaller intervals.<br>
<br>
The reason why inexact intervals are perfectly possible<br>
and do not produce an ugly sound is that none of these<br>
partials have significant higher harmomics - they are<br>
pure sine frequencies. So there is no beating of higher<br>
harmonics, which is what makes most detuned instruments<br>
sound bad.<br>
<br>
Except for the 'hum', these components will usually<br>
have a normal exponential decay (roughly). The 'hum'<br>
is different: it starts at low amplitude, and rises<br>
during a second or two before decaying.<br>
<div class="im HOEnZb"><br>
Ciao,<br>
<br>
<br>
--<br>
FA<br>
<br>
Vor uns liegt ein weites Tal, die Sonne scheint - ein Glitzerstrahl.<br>
<br>
</div><div class="HOEnZb"><div class="h5">_______________________________________________<br>
Linux-audio-user mailing list<br>
<a href="mailto:Linux-audio-user@lists.linuxaudio.org">Linux-audio-user@lists.linuxaudio.org</a><br>
<a href="http://lists.linuxaudio.org/listinfo/linux-audio-user" target="_blank">http://lists.linuxaudio.org/listinfo/linux-audio-user</a><br>
</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><br><div>follow me on my <a href="http://audio-and-linux.blogspot.com/" target="_blank">Audio & Linux blog</a> !</div><br>
</div>