[SciPy-Dev] SciPy Goal

josef.pktd@gmai... josef.pktd@gmai...
Thu Jan 5 10:00:39 CST 2012


On Thu, Jan 5, 2012 at 10:32 AM, Neal Becker <ndbecker2@gmail.com> wrote:
> Some comments on signal processing:
>
> Correct me if I'm wrong, but I think scipy signal (like matlab) implement only a
> general purpose filter, which is an IIR filter, single rate.  Efficiency is very
> important in my work, so I implement many optimized variations.
>
> Most of the time, FIR filters are used.  These then come in variations for
> single rate, interpolation, and decimation (there is also another design for
> rational rate conversion).  Then these have variants for scalar/complex
> input/output, as well as complex in/out with scalar coefficients.
>
> IIR filters are seperate.
>
> FFT based FIR filters are another type, and include both complex in/out as well
> as scalar in/out (taking advantage of the 'two channel' trick for fft).

just out of curiosity: why no FFT base IIR filter?

It looks like a small change in the implementation, but it is slower
than lfilter for shorter time series so I mostly dropped fft based
filtering.

Josef


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