tolve,

If you are dealing with DC-shift, analysis is really not necessary to ascertain
its presence. Any graphical sound editor will show that the signal is actually
drifting up (or down) from NULL.

Also be aware that while the butterworth filter solution works well in most
cases (Cecilia has a DC remover module), it will not work in all cases (in my
experience). We are considering building an opcode to do just that. MixViews has
a *very* efficient DC-remover.

> figured if analysis did indicate a subsonic problem filtering would be the
> key. well then, butterworth it is. seems that analysis of files can take
> time though so perhaps routine filtering of fm sounds will be the answer.
> was dreaming of a fast way just to ascertain lowest (pitch below 15 Hz)
> frequency. sigh.
> 
> thanks very much for your response dave!
> 
> tolve
> 
> >Perhaps the most useful quick-fix, especially in the situation Tolve
> >originally asked about, would be to use a Butterworth filter (butterhp),
> >or series of them in the instrument design.

-- 
________________________________________________________
Jean Piche
Universite de Montreal
http://mistral.ere.umontreal.ca/~pichej
http://www.musique.umontreal.ca/electro/CEC/