Acoustic Position Measuring Device

[Ganesha Krishna]

here is some prior art, albeit fictional,
http://www.imdb.com/title/tt0468569/synopsis  [heavy spoilers alert!]
search for 'cell phone sonar'

-GK


On Wed, Aug 20, 2008 at 12:49 AM, Russell Sears <sears at cs.berkeley.edu> wrote:
> Charles Pax wrote:
>> The problem with having an external speaker or microphone is that such a
>> solution does not simplify the situation. Sure, it would make the Freerunner
>> (plus some stuff) into a measuring device, but if we need a second piece of
>> hardware to take measurement, we may as well just carry around a tape
>> measure. Oh well.
>
> Right, but I need to have a hands free headset so I can listen to music,
> so it's not a second piece of hardware.  Admittedly, I could put a piece
> of tape on the cord every inch and get the same effect...
>
> I wonder if there's some other application of sending out a chirp and
> recording it.  Maybe the FR could use echo to characterize acoustic
> environments.  Then it would know if you've left it in a drawer, pocket,
> car, concert hall, etc...
>
> There's also echo cancellation, which the FR desperately needs, and is a
> similar trick.
>
>>
>> So the theory seems plausible. When I get my Freerunner (when are they back
>> in stock?!) I'll have to do some testing. Thanks for the input, folks.
>
> You could probably develop it on a linux laptop and alsa.  For this app,
> the main difference between the platforms is that the FR doesn't have a
> floating point unit, and it uses a different microphone jack.
>
> -Rusty
>
>>
>> -Charles
>>
>>
>>
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