On 8/3/2011 7:54 PM, Oli Glaser wrote:
> Would help to know a little more about what you are planning - roughly=20
> what do you need the PIC to do? (e.g. compression, noise reduction,=20
> effects, voice recognition, plain recording/playback) Also, you=20
> mention the M-Audio card, and also a DAC - are you wanting the sound=20
> to come from/go to the PC or it to be based just around the PIC? What=20
> resolution do you need for the samples and what sampling rate, and how=20
> much latency (if relevant) is OK? bandwidth needed - e.g. 20Khz,=20
> 10Khz? (e.g. for voice/music/beeps) Sorry for so many questions :-)=20
My objective is to learn what I can about Digital signal processing and=20
FFT. My real hobby in retirement is studying. I suspect that if I could=20
find the details of the implementation of any PC soundcard I could=20
bypass using a PIC at the moment.

The M-Audio card is impressive when used to process the I-Q signals for=20
a software defined radio. (Google "softrock").
It allows a bandwidth in this application of about 190 khz. Latency=20
seems to be an issue with any DSP.

If I find the details of its windows or Linux implementation I will=20
pursue the M-Audio path. In the meanwhile, I will have to work with the=20
PIC A->D->A setup because that is what I can grasp!
I also have a TI Piccolo Stick that may be better suited to the task but=20
it looks like a steep learning curve. I am old, my time is limited, both=20
short term & long term!

There is no product to develop, there is no commercial interest on my=20
part. There are many commercial products in Amateur Radio that are=20
reasonable in cost and awesome in performance. I may never reach the=20
desired level of understanding but that is not a problem... the fun is=20
in the pursuit!

-- John Ferrell W8CCW Nothing sucks more than that moment during an=20
argument when you realize you're wrong.

--=20
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