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

Gordon JC Pearc e gordonjcp at gjcp.net
Sun May 6 12:24:20 CEST 2012

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

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