A good bit of it is here -
http://hyperphysics.phy-astr.gsu.edu/hbase/HFrame.html
more specifically this and stubs from here:
http://hyperphysics.phy-astr.gsu.edu/hbase/HFrame.html

This is a massive site - I bought the CD some years ago - likely will
buy again for an update.

Many topics are contained on this site.

In short - Fourier determined how to write equations form the behavior
of waves.  A waveform
is started with a fundamental wave and to it various amplitudes of other
waves are added or
subtracted.

A simple case might be demonstrated in concert or two horns or whistles
mixing sounds.
The mix would be a complex 'summation'.

Typically  a  series of sine and cosine  values  are used. Look at
Harmonic content
and Fast Fourier transform (bottom of the page) link.

Hope this helps.  The site is a great resource for many topics.
 Martin

Mario Rodríguez wrote:
>
> Sorry, excuse me for another subject. I am Mario, working in the
> periodicity of population density of land snail using Fourier Time
> Serie Analysis.
>
> Please could anyone advice me about some papers on the web or hard
> copies on the estacionality in population density of land snail using
> Fourier Time Series?
>
> I need to get information about spectral density, periodo,
> frecuency...from population density in land snail.
>
> thank you very much for your help
>
> Mario Rodríguez,
> Spain
>
>

--
Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Endowed; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/

----------------------------------------------------------------------
[log in to unmask] - a forum for informal discussions on molluscs
To leave this list, click on the following web link:
http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1
Type your email address and name in the appropriate box and
click leave the list.
----------------------------------------------------------------------