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-   -   [SCRIPT] Using the N900 as Sonar (https://talk.maemo.org/showthread.php?t=93435)

Vento 2014-07-12 06:59
Re: Using the N900 as Sonar
 
Little suggestion. Maybe you should change the title... Add [SCRIPT],[POC], [ANNUNCE] or [WIP] before the name

Estel 2014-07-12 10:23
Re: Using the N900 as Sonar
 
Announce is good idea. Otherwise, most people may think it's some...one asking, if his N900 can act as a sonar. Which may result in whole array of reactions - moving along without reading is just one of them ;)

SHARP66 2014-07-13 01:10
Re: [SCRIPT] Using the N900 as Sonar
 
I think It can detect direction to, if you alter the sound in channels.

taixzo 2014-07-13 03:41
Re: [SCRIPT] Using the N900 as Sonar
 
Quote:
Originally Posted by SHARP66 (Post 1432581)
I think It can detect direction to, if you alter the sound in channels.
So, like the way our ears work, but in reverse? (two sounds/one microphone rather than two microphones/one sound)

Velian 2014-07-13 19:01
Re: [SCRIPT] Using the N900 as Sonar
 
It would be a great idea to take some developer eh did this idea of ​​a real theremin n900

lexik 2014-07-13 22:31
Re: [SCRIPT] Using the N900 as Sonar
 
Quote:
Originally Posted by Velian (Post 1432635)
It would be a great idea to take some developer eh did this idea of ​​a real theremin n900
You need two 'lines' for theremin, maybe proximity sensor near front cam could be the second one? (pretty crazy)

rotoflex 2014-07-14 06:25
Re: [SCRIPT] Using the N900 as Sonar
 
If it's emitting clicks for sonar, they might not be very musical for a theremin.

A theremin could be fun, though.

Maybe you could use the front camera to calculate distance by the monocular depth cue apparent size of a hand: smaller as it's farther away, larger as it's closer, and whether it's at nearer the left, right, top or bottom.

peterleinchen 2014-07-14 07:21
Re: [SCRIPT] Using the N900 as Sonar
 
Quote:
Originally Posted by rotoflex (Post 1432664)
If it's emitting clicks for sonar, ...
Do you mean this kind of clicks?
Then we possibly may achieve it via espeak?

sulu 2014-07-14 14:00
Re: Using the N900 as Sonar
 
Quote:
Originally Posted by Estel (Post 1432512)
Interesting, gotta check the accuracy. I wonder if it would more effectively underwater, for obvious reasons (after altering calculations, of course)?
As a rough estimate, the maximum range should increase by factor 9 due to the better sound propagation quality of water compared to air, but the accuracy will drop by about factor 4.3 due to the higher speed of sound (and therefore smaller delay).

The details depend on signal frequency as well as medium temperature and pressure.
I assumed something in the range of 1-2kHz, 25°C and sea level.

chill 2014-07-17 22:23
Re: [SCRIPT] Using the N900 as Sonar
 
Could range and/or accuracy be increased by attaching more powerful speakers and/or a better microphone?

One could detect movement in another room that way, too (which would certainly be a range increase) ;).


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