Re: Lowest power tune detector.


John Jardine. wrote:


Your're pretty much looking at a multi tone telemetry system. The 60's
sounding rockets needed racks full of equipment to do similar. Even now
you'll need some -heavy- signal massaging using quite a powerful DSP/Micro.
Small PICs won't touch it. FFTs' are way over the top. Need to be using
something like the Goertzel algorithm.

Wrong you are. I have DTMF decoder implemented in a PIC. Its been
answering my phone calls for a couple of years now, so I know it works.

Check it out at...

http://members.cox.net/berniekm/qdft.html

Luhan

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