I don't know if this fits your needs, but it would be fairly simple to
produce a logarithmic *graph* of the linear frequency analysis produced by
the pvs opcodes.  But the data itself would still be spaced linearly.  If
that doesn't help, I don't know of anything.

-Chuckk

On 10/9/07, Gregory Cooksey <cooksey@cs.wisc.edu> wrote:
>
> Hello,
>
> I'm trying to figure out a way to transform audio files from the
> standard amplitude over time format to some kind of frequency over
> time format, preferably with frequency values spaced along a
> logarithmic scale.  This is for a machine learning experiment.
>
> I've been trying to figure out if I can use csound to perform the
> transformation.  It looks like the spectrum opcode may do what I'm
> looking for, but I'm having a hard time figuring out what its output
> signal looks like.  Is the wsig data type documented anywhere, or is
> there a better way to do what I'm trying to do?
>
> If I haven't explained what I want well enough let me know and I'll
> try to clarify.
>
> Thanks for any help.
>
> -Greg
>
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