[sdiy] [OT] Mini-DSP or TI Mini-DSP for metal detector audio

[Gordon JC Pearc e]

On 02/05/12 21:17, Barry Klein wrote:

> These detectors typically have a constant audio output tone that is a little warbly but gets louder and/or varies in frequency if a target is detected.
> There was a product called Superfix that may have had a DSP inside to allow silence until a target is detected.  It was complicated to use though and very very expensive.

If the tone is more-or-less constant and changes pitch on detecting a 
target, couldn't you just notch out its "idle" state?

-- 
Gordonjcp MM0YEQ