Trying to hash out a quick way to test whether a $4K widget will help one
of my kids out or not.

Correct me if I'm wrong, but it looks to me like the most audio horsepower
I could count on from a 20MHz PIC would be ADC sampling at around 33kHz:

Assume fairly low (50 Ohm) input impedance
Tacq ~ 11uS
Tad = 19.2uS
Tsample ~ 30.2uS

or around 33kHz sample rate, give or take a bit, which would be quite
adequate for normal speech, would it not?  Telephone quality is 56Kbit/sec
or 8K samples/sec., so even if I tried for 10-20K samples per second I'd
be getting relatively good quality sound, right?  Or did I miss anything?

The idea is to use the ADC to sample incoming sound and Roman's 1-bit
sound for output, with a delay in between.  I've never used the ADC at
more than a few hundred samples per second, is there quicksand to watch
out for?

Dale
---
We are Dyslexia of Borg.
Fusistance is retile.
Your ass will be laminated.

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads