Re: Lowest power tune detector.


Ian Stirling wrote:
I'd like a keyring that responds to a whistled tune, rather than a
simple tone, for better noise rejection.

Are there micros that can do this?
ADC at ~8Khz, clocking at a few tens of Khz, and do the MAC thing for
maybe 8 tones?

Maybe a low power op amp on the mic providing a logic level output to a
PIC in sleep mode. The PIC wakes up on any noise and does FFT to check
for the tone. PIC12F675 is a good choise, very low current in sleep
mode and 10-bit a/d for the tone input. Run the whole thing on a 3
volt watch battery.

Luhan

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