[App] [26 Dec 2008] Noise Tracker - Windows Mobile Apps and Games

Noise Tracker
Noise Tracker measures the loudness by taking an audio sample and calculating its mean average. The black bars are the mean values and the current wave is drawn in blue. Don't know yet what a real use case for this app could be. Anyway, hope someone will find it useful. Tested on a wm6 prof. device.
With 'Scale' the bars drawing height of the bars can be changed.
With 'Rate (ms)' the length (in milliseconds) of the audio sample can be changed.
Info
In case there are no bars visible, change the rate to > 400ms. (thanks nir36)
The measured values are not dB! Will be changed in the app (when some additional features will be implemented).
v1.1
select different channels if available
show bps
v1.2
auto volume setting (measures loudness every x minutes and adjusts the ringing volume)
Thanks,
heliosdev

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this could actually help me with my studies.. thank you

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What units is the maximum shown in?

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The values are in dB and calculated using the root mean square on the audio data.
If x is the array with the audio data then it is
value = sqrt(1/n * sum(x1*x1+x2*x2+...+xn*xn))
Not sure if there is some 'magic' factor in the audio data, it's just an array of bytes.

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heliosdev said:
The values are in dB and calculated using the root mean square on the audio data.
If x is the array with the audio data then it is
value = sqrt(1/n * sum(x1*x1+x2*x2+...+xn*xn))
Not sure if there is some 'magic' factor in the audio data, it's just an array of bytes.
Click to expand...
Click to collapse
how can that be that it is in dBs? the highest value I've gotten is around 2, normal sound would be 60+ atleast...

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I'm getting values around 80 when playing some music or watching tv and holding the phone close to the speakers. I'll need to write some more info into a log file to find out the reason why you only get small values.

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heliosdev said:
I'm getting values around 80 when playing some music or watching tv and holding the phone close to the speakers. I'll need to write some more info into a log file to find out the reason why you only get small values.
Click to expand...
Click to collapse
sounds good, I'll keep an eye here and keep testing for you...

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Is there a chance that you could put Shannon's formula inside this thing?
(that is, B*log(1+s/n)) to check the bandwidth used and the bps transfered each sec?

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A great use for this would be to automatically turn up (or down) the in-call volume if there's a lot (or very little) of background noise.

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Zoltair Wright said:
A great use for this would be to automatically turn up (or down) the in-call volume if there's a lot (or very little) of background noise.
Click to expand...
Click to collapse
Agree! this could be a great use

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It doesn't work on my AT&T Fuze

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nir36 said:
Is there a chance that you could put Shannon's formula inside this thing?
(that is, B*log(1+s/n)) to check the bandwidth used and the bps transfered each sec?
Click to expand...
Click to collapse
The bps is calculated now. I'm not quite sure if the time (rate in ms) should be taken also in this calculation. Currently it isn't. Should this bps be multiplied by (recording time in ms / 1000)?
Btw, the used Bandwidth is 11025Hz.

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pandaboyy said:
It doesn't work on my AT&T Fuze
Click to expand...
Click to collapse
Can you try again with the latest version and see if it works when changing the channel?

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Zoltair Wright said:
A great use for this would be to automatically turn up (or down) the in-call volume if there's a lot (or very little) of background noise.
Click to expand...
Click to collapse
That could be useful. And this app could start when an incoming call starts, adjust the volume and close again.

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Plenty of uses!
Very cool indeed! I can think of lots of uses..including my kids and the neighbors! Actually, I have some clinical applications for this little beauty!
Thank you so much!!

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heliosdev said:
Noise Tracker
Noise Tracker measures the loudness ... hope someone will find it useful
Click to expand...
Click to collapse
heliosdev, you can build a app to play a mp3 file when someone claps or whistle
(I'm not joking, you can find your phone that way...)

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Seriously cool, thanks for the app! As others mentioned, if you could add a function where this thing could call or be called by opther programs it could be hugely useful. How about sampling the background noise every 15 min or so and adjusting the ring volume so I don't miss calls in noisy places or get a heart attack when someone calls me while I'm in bed reading a book. If it's sensitive enough it could be used to bug a room, when voices are detected it starts the voice recorder...etc., etc. TONS of possibilities!!
P.S. ff2005, try calling your phone if you can't find it

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That would be nice! Right now I can tell you that such a feature is scheduled for April 1st!
ff2005 said:
heliosdev, you can build a app to play a mp3 file when someone claps or whistle
(I'm not joking, you can find your phone that way...)
Click to expand...
Click to collapse

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New version is up which sets the ringing volume. This needs to be tested because I haven't a second phone to call myself.
It takes the current loudness l and sets the ringing volume to:
l > 70 -> 5
l > 50 -> 4
l > 30 -> 3
l > 10 -> 2
else -> 1
I'm setting the registry value
CurrentUser\ControlPanel\SoundCategories\Ring\InitVol
Zoltair Wright said:
A great use for this would be to automatically turn up (or down) the in-call volume if there's a lot (or very little) of background noise.
Click to expand...
Click to collapse
orb3000 said:
Agree! this could be a great use
Click to expand...
Click to collapse
mlalahoi said:
Seriously cool, thanks for the app! As others mentioned, if you could add a function where this thing could call or be called by opther programs it could be hugely useful. How about sampling the background noise every 15 min or so and adjusting the ring volume so I don't miss calls in noisy places or get a heart attack when someone calls me while I'm in bed reading a book. If it's sensitive enough it could be used to bug a room, when voices are detected it starts the voice recorder...etc., etc. TONS of possibilities!!
P.S. ff2005, try calling your phone if you can't find it
Click to expand...
Click to collapse

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It works on my xda flame.
Should be useful as or detector of noise: do something when the level is over a value, or when the level is below a value (end of noise)