>=20
> > Sorry if I wasn't clear. Actually I want 8 separate outputs. Eventually
> > this will drive 8 separate speakers. Each one with a separate frequency
> > response. This is why I could have 4 separate DPICS each filtering out =
2
> > channels from the input signals to give me 8 bandpass filtered outputs.
> > Is this possible and is DSPIC FD a good tool for the job.
> > Thanks,
> > Jim
>=20
> Jim,
> >From my experience in a conference room in Arizona while mentally in a
> jet-lagged stupor, it would seem as though Microchip's Filter Designer
> is fully capable of calculating coefficients for you. You may want to
> do some more background research to make sure you know what you're
> getting into. Most texts including Wikipedia are likely to thoroughly
> confuse.
>=20
> You don't have to go through all the Z-transform math to figure it out
> unless you really want to know the derivations. It would likely help
> you a lot to write example code in MATLAB (or Octave or Scilab or
> Python) to perform your filtering operation, using the coefficients
> that filter designer gives you, before you try to shoe-horn it into a
> PIC.

There are plugins for Octave that will calculate the coefficients I
need. Since I have never done any DSP programming I guess the attractive
aspect of DSPIC FD is that it will generate the software as well as the
coefficients. There are two versions of DSPIC FD . From the site "The
differences between the Lite and full versions are the number of filter
taps allowed for the lite vs the full, respectively: 1) FIR Filter Taps:
64 vs 513, 2) IIR Low pass or High pass Filter Taps: 4 vs 10, 3) IIR
Band pass or Band stop Filter Taps: 8 vs 10." I hope to play around with
Octave to also help me decide if Lite will do the job.

Jim
>=20
> --=20
> Martin K.


--=20
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