Finding certain frequencies in an audio signal

try out discrete evolutionary algorithm (D.E.T)



Eric Jacobsen wrote:
> On 4 Jul 2006 22:45:14 -0700, "Rune Allnor" <allnor@tele.ntnu.no>
> wrote:
>
> >
> >Jerry Avins wrote:
> >> Rune Allnor wrote:
> >>
> >> >       ... I haven't used Goertzel's algorithm
> >> > myself, but I can't really see that it fits in this scheme.
> >>
> >> Why not? It's pretty standard for DTMF.
> >
> >There are too many unknowns. Bandpass filters are simpler and more
> >flexible when working with a signal with unknown properties. Maybe
> >the Goertzel fits in the end, but it's a bit too specialized to be used
> >
> >as a first attempt to solve the problem.
> >
> >Use a plain vanilla tool first. When you know what you do and have
> >a clear idea about what you want, you can use the specialist tools.
>
> I guess I got lost here somewhere...the Goertzel algorithm is a
> bandpass filter for pretty much the described application.   My only
> question would be sensitivity given the short duration of the tones as
> well as susceptibility to whatever frequency offsets (errors) that may
> be expected in the tones (if any).
>
> Eric Jacobsen
> Minister of Algorithms, Intel Corp.
> My opinions may not be Intel's opinions.
> http://www.ericjacobsen.org