Sound source localize

[MohamedOsama]

hi! I'm doing a project to localize acoustic source with array of hydrophones

From where should i begin?

What is the hardware should i use?

Thanks

[Henrik_Volkers]

Type of sound source? This define your needed frequency range, so the needed samplerate (I would go for 5 to 10 times max freq)

Number of Hydrophones? That defines the number of channels you need

You should look for simoultanious sampling devices, for a lot of sensors you need to be able to sync them.

Signal processing:

What signal processing way do you want to go?

(single pulse signals -> simple correlation, tone = FFT phase?)  Lot of papers and web sources to read..

'Real time' ?  How fast do you need to localize?   Than will give you an idea of the DSP power you need. (FPGA?)

For your first steps you can use two simple mics and your soundcard 😉

[MohamedOsama]

Thanks Henrik , I didn't find any previous vi's similar for this task for learning , Can anyone help me?

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@Henrik_Volkers wrote:

Type of sound source? This define your needed frequency range, so the needed samplerate (I would go for 5 to 10 times max freq)

Number of Hydrophones? That defines the number of channels you need

You should look for simoultanious sampling devices, for a lot of sensors you need to be able to sync them.

Signal processing:

What signal processing way do you want to go?

(single pulse signals -> simple correlation, tone = FFT phase?)  Lot of papers and web sources to read..

'Real time' ?  How fast do you need to localize?   Than will give you an idea of the DSP power you need. (FPGA?)

For your first steps you can use two simple mics and your soundcard 😉

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[Bob_Schor]

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@MohamedOsama wrote:

Thanks Henrik , I didn't find any previous vi's similar for this task for learning , Can anyone help me?

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Yes.  You need to learn several things:

• The "physics" of sound and sound propagation/transmission.
• Something about the nature of signals, signal measurement, signal analysis.
• Principles of data acquisition, including effects of sampling, digitization, analog/digital representations.
• If you want to do the acquisition and analysis in LabVIEW, you need to learn (and get experience) in LabVIEW.

These things take time, of course, but if you put in the time, you'll be able to do these, yourself, and for others.  Otherwise, there are engineers and scientists whom you could hire to do it for you.

Bob Schor

[MohamedOsama]

how can implement array of microphones to labview with myrio ?

[RavensFan]

How would you implement 1 microphone?

How would you implement 2?

An "array" is going to be just like 2, but more.

Your question lacks any details of where you are having problems to be able to offer any more specific help.

[MohamedOsama]

I should implement 3 hydrophones and take an output of each one to a band pass filter then compute the phase shift between them 

[RavensFan]

Have you been able to connect 1 hydrophone  and get signals from it?

[MohamedOsama]

No, at least 2 hydrophones

[RavensFan]

Until you figure out how to connect 1 hydrophone, you shouldn't be thinking about 2 or more hydrophones.  How should they connect to the MyRIO?  Do they output a voltage signal?  I'm not familiar with the MyRIO, but I assume it has analog input channels.