Wednesday, August 10, 2005

Using 5.1 Audio and a Microphone as a Tracking Device

Ok, this is just a thought and may be completely unfeasible but I was trying to think the other night how to create a tracking device using regular objects that are low cost and in common use.

I was reading up on how GPS works by sending radio signals from satellites that are sync'd with atomic clocks and then calculating the distance from each satellite by working out how long the signal took to get from the satellite to the receiver thereby allowing the signal to be triangulated. This is an over-simplified view I'm sure, but bear with me.

So, my next thought was... why can't something like this be done for a local setup. Obviously radio waves would travel far too quickly so something slower would be needed, so my first thought was sound.

What if a 5.1 system sent regular high frequency blips from each of it's speakers (each speaker a slightly different frequency) and you used a microphone as a tracker and had software to calculate the relative distance between each of the speakers based on the order and timing of the frequencies on the sampled signal?

I am not a physics or math expert, but I have tried some lamens calculations here. The Soundblaster Audigy can sample at a rate of 96khz. Sounds travels in air at approximately 345 meters per second. Therefore to travel one meter it takes 0.00289 seconds. If 96khz means 96000 samples per second, then that gives a sample every 0.0000104166 seconds. That means a potential 277 samples per meter which could give an accuracy of 0.00361 meters (or 0.3cm). Sounds good. Obviously this is assuming the software could process the signal in realtime. I am assuming some type of Fourier Transform would be needed to split the frequencies back out. I am not sure how quickly that can be done.

Can anyone who knows more about physics than me possibly comment?

5 Comments:

At 3:52 AM, Blogger Shotta Blogger said...

I've been searching for gps fleet tracking system for a while and finally came across something worth reading. Using 5.1 Audio and a Microphone as a Tracking Device is not exactly what I was looking for, but as I said it was something worth reading. Raeldor, I appreciate the information and would like to encourage you to keep up the good work. I hope I come across more great reads in my quest for gps fleet tracking system.

 
At 7:06 PM, Blogger  said...

You know ,I have some shaiya gold,and my friend also has some
shaiya money,do you kouw they have the same meaning,Both of them can be called shaiya gold,I just want to
buy shaiya online gold,because there are many
cheap shaiya gold

 
At 7:10 PM, Blogger  said...

You know ,I have some runescape gold,and my friend also has some rs gold,do you kouw they have the same meaning,Both of them can be called runescape money
I just want to buy runescape,because there are many
cheap rs gold

 
At 9:53 PM, Blogger xuemei said...

aion chinaaion china gold,
aion cn goldaion chinese gold,
aion gold chinaaion gold chinese,
china aion goldchinese aion gold,
aion china kinaaion chinese kina,
aion kina chinachina aion kina,
aion china buybuy aion china,
aion chinese server goldaion cn server gold,
aion china server goldchina aion server gold,
chinese aion server goldaion chinese server gold,
aion cn server kinaaion china server kina,
china aion server kinachinese aion server kina

 
At 6:42 PM, Blogger xuemei said...

Now do you worried about that in the game do not had enough second life linden to play the game, now you can not worried, my friend told me a website, in here you can buy a lot linden dollars and only spend a little money, do not hesitate, it was really, in here we had much secondlife money, we can sure that you will get the cheap linden, quick to come here to buy lindens.

Now do you worried about that in the game do not had enough requiem gold to play the game, now you can not worried, my friend told me a website, in here you can buy a lot requiem lant and only spend a little money, do not hesitate, it was really, in here we had much requiem money, we can sure that you will get the cheap requiem lant, quick to come here to buy requiem online gold.

 

Post a Comment

<< Home