Suggestion regarding picmicro

Guest New · Guest

Hi.

I need to develop some voice processing software.

Simple explanation:

MIC -- CHIP -- AMPLIFIER -- SPEAKER

Power supply : 3V

My job is to process all incoming voice, set some filter, send to output.
Am using picdem2 demo board so I can test just those MCU's.
Main goal is to process as much as possible data thru chip.
What chip should I choose ?

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Select your sample rate for audio. Let's say you choose 8 KHz.
The period is 125 us. All of your operations have to be done
in that time period. This includes the A/D conversion. Now
consider that if you run a PIC at 20 MHz, you get 5 instruction
cycles per microsecond (us). So you have 625 instruction cycles
to take a sample, process it, and write it to the (external) D/A.

Write your program, and run the MPLAB MPSIM profile menu
and see how many instruction cycles it takes to execute your code.
If it takes too many, you can reduce your code or use a PIC with
a higher oscillator speed (40 MHz).

Guest New · Guest

SherpaDoug · Joined: 07 Sep 2003 Posts: 1640 Location: Cape Cod Mass USA

This is just the sort of application a DSPic was born to do. Please consider them.
_________________
The search for better is endless. Instead simply find very good and get the job done.

Guest New · Guest

Can I use dsPic with PICDEM 2 PLus and ICD debugger ?

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Sherpa,
Have you been reading FvM's posts ? Do a search for PCD and put FvM
in as the author.

SherpaDoug · Joined: 07 Sep 2003 Posts: 1640 Location: Cape Cod Mass USA

OK, so I guess PCD is not yet ready for prime time. Newbies should probably stay clear of it for a few months. I do intend to get it the next time I upgrade my CCS.
_________________
The search for better is endless. Instead simply find very good and get the job done.

Guest New · Guest

So suggestion would be something in PIC24H line ?

I can't find any device support list for PICDEM 2 but i guess that PIC24H should be supported ?

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

To Sherpa:
I emailed CCS a list of all of FvM's bug reports on PCD. They emailed
me back an ID number for the bug report. So at least now they know
about the bugs. Hopefully they will fix them.