I can't add much to this conversation except that I think the Blackfin
running at minimal speed might be the lowest power solution. Even at its
lowest operating speed, it would still be plenty fast for the types of
filtering mentioned. A good front end might be a Wolfson WM8731. This
device is also a low power, high performance device. They are used in
Apple's IPOD. TI makes a very similar part.Jim could simulate everything
with an Analog Devices EZ-Kit and build the final product into a pager box.

--
Al Clark
Danville Signal Processing, Inc.
--------------------------------------------------------------------
Purveyors of Fine DSP Hardware and other Cool Stuff
Available at http://www.danvillesignal.com