Robert:

I was looking for this kind of analyzer for a while, could you point me some piece
of code?
A 20Hz-20KHz bandwidth, 10-16 frequencies and 4 bit resolution would be great for
this aplication, if some realtime could be achieved, like 3 chunks/s better.
I just need the basics for DFT calculation if someone could help me...


>
> So:
>
> 1. What bandwidth? If audio, one would assume 20Hz-20kHz would be
> necessary. This is tough to do as a 'continuum' on a PIC.
>
> 2. What resolution in frequency? If only 8-16 individual frequencies were
> needed (sort of like the LED bar graph spectrum displays), then fixed
> frequency transforms might be viable.
>
> 3. What accuracy is needed? If only 4-bits or so, then memory requirements
> are much easier. If 8-bits, you need an external memory.
>
> In summary, it should be possible to do a 32-, 64- or even 128-sample DFT
> on a PIC, if you're willing to tolerate a less than 8-bit resulting
> accuracy. The maximum sampling rate would probably be only 1-2 kSPS
> real-time, expandable if delays in reporting are allowed (1st record, then
> analyze).
>
> This kind of application is much better suited to a microcomputer with a
> larger address space and hardware 8-bit multiply at least. E.g., 8051,
> etc., or better.
>
> ================================================================
> Robert A. LaBudde, PhD, PAS, Dpl. ACAFS  e-mail: ral@lcfltd.com
> Least Cost Formulations, Ltd.            URL: http://lcfltd.com/
> 824 Timberlake Drive                     Tel: 757-467-0954
> Virginia Beach, VA 23464-3239            Fax: 757-467-2947
>
> "Vere scire est per causas scire"
> ================================================================
>
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