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demodulation question


Dear Mathgroupers,

I have some measured curves which following the model have the following form :

s(x) = f(x)*cos(k*x)

where k is a constant and f(x) is a slowly varying function.  Because there
is coniderable noise on the measurements the cosine is not very regular. 
Does anyone have an idea how to extract f(x)?  I tried the NonlinearFit
package and this was not very successfull!

Thank you very much for you kind help.

Yves Verbandt
**********************************************
Yves Verbandt
Vrije Universiteit Brussel
Applied Physics Department
ALNA-TW, Pleinlaan 2, B-1050 Brussel, BELGIUM
tel. +-32-2-629.36.13
fax. +-32-2-629.34.50
Internet yverband at vnet3.vub.ac.be
**********************************************



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