How to apply MVDR beamformer processing?

Hello everyone,

I have an audio signal recorded with a microphone array of 3 microphones.

How can I apply an MVDR beamformer to this signal?

I already used phased.SubbandMVDRBeamformer, following examples from Matlab, but I don't think it works in the range 20Hz - 20kHz!

Thanks in advance!

Answer 1

[Rahul]

Hi Marko,

To achieve the required task of applying MVDR beamformer processing to your audio signal you can make use of 'phased.MVDRBeamformer' function. It is mentioned that it has an operating frequency of 300 MHz.

You can also check this MATLAB Answer: https://www.mathworks.com/matlabcentral/answers/2040856-how-to-apply-mvdr-to-real-signal

This answer mentions that since the audio collected from a microphone is unmodulated, the function 'phased.SubbandMVDRBeamformer' might not work properly with unmodulated signals. It recommends using other Beamformers are documented to work with unmodulated data, such as the FrostBeamformer, GSCBeamformer etc.

You can refer to the following MathWorks documentations to know more about these functions:

'phased.MVDRBeamformer': https://www.mathworks.com/help/releases/R2023a/phased/ref/phased.mvdrbeamformer-system-object.html

'phased.GSCBeamformer': https://www.mathworks.com/help/releases/R2023a/phased/ref/phased.gscbeamformer-system-object.html

'phased.FrostBeamformer': https://www.mathworks.com/help/releases/R2023a/phased/ref/phased.frostbeamformer-system-object.html

Hope this helps! Thanks.