On Tue, Aug 19, 2008 at 11:01 AM, Andrew Burgess <[EMAIL PROTECTED]> wrote:
> An application like this exists on the OLPC XO written in python. I
> think it's called 'Measure'. Rather than using reflected sound it uses
> a second laptop to hear the sound and the clock sync is done via WiFi.
> Diff
Hi Openmoko list :)
Cool idea :) As already mentioned you won't get a real validated
measurement system, but it should be fun enough :)
I would suggest using a
http://en.wikipedia.org/wiki/Maximum_length_sequence (MLS) instead of
a sweep or alike. As its spectrum is flat you will hear only a whit
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 <[EMAIL PROTECTED]> wrote:
> Charles Pax wrote:
>> The problem with having an external speaker or micr
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 j
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
mea
Cédric Berger wrote:
> On Tue, Aug 19, 2008 at 16:49, Charles Pax <[EMAIL PROTECTED]> wrote:
>
>> I have a few questions
>> 1) Are the any technical obstacles to this idea?
Time synchronization, sensitivity / volume of audio devices.
>> 2) What is the frequency range of the speaker?
>> 3) What i
I think if we can have a small device, just made up of a mic and a
speaker and a IC :p then we can put the device like at the end of the
wall and we'll go to the other side .. so as we want to measure the
distance between the device and the freerunner, if we could have a
directional speaker directe
Cédric Berger wrote:
> On Tue, Aug 19, 2008 at 16:49, Charles Pax <[EMAIL PROTECTED]> wrote:
>
>> I have a few questions
>> 1) Are the any technical obstacles to this idea?
>> 2) What is the frequency range of the speaker?
>> 3) What is the frequency range of the microphone?
>> 4) Any other commen
Charles Pax wrote:
> On Tue, Aug 19, 2008 at 11:09 AM, C
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On Tue, Aug 19, 2008 at 11:09 AM, Cédric Berger
<[EMAIL PROTECTED]>wrote:
>
> I would think main problem is microphone sensitivity/speaker strength.
> Hard to get over noise.
> But I am curious to know to what point this could work !
>
Uncertainty in the measurement would be an issue, but to what
On Tue, Aug 19, 2008 at 17:09, Cédric Berger <[EMAIL PROTECTED]> wrote:
>
> I would think main problem is microphone sensitivity/speaker strength.
> Hard to get over noise.
> But I am curious to know to what point this could work !
>
mmm and probably also reflections caused by objects closer t
On Tue, Aug 19, 2008 at 16:49, Charles Pax <[EMAIL PROTECTED]> wrote:
> I have a few questions
> 1) Are the any technical obstacles to this idea?
> 2) What is the frequency range of the speaker?
> 3) What is the frequency range of the microphone?
> 4) Any other comments of ideas?
>
I would think
On Tue, Aug 19, 2008 at 7:49 AM, Charles Pax <[EMAIL PROTECTED]> wrote:
> Hey, gang, here's an idea: Use the Freerunner as an acoustic measuring
> device.
An application like this exists on the OLPC XO written in python. I
think it's called 'Measure'. Rather than using reflected sound it uses
a se
Hey, gang, here's an idea: Use the Freerunner as an acoustic measuring
device. (This is just a brain dump and not super detailed.)
I got the idea while driving from Maine to New Jersey on Saturday during a
discussion with my brother about an article I had read [1]. We were trying
to think of poten
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