What is the meaning of 'operatingFrequency' parameter for SubbandMVDRbeamforming in the context when input signal is not modulated?

I would like to appy SubbandMVDRBeamforming on audio signal. Si nce such signal is not modulated I have a problem hos to setup the operatingFrequency.

Answer 1

[Honglei Chen]

Currently SubbandMVDRBeamformer assumes the signal is modulated so it performs narrowband MVDR in each subband. If the signal is not modulated, like in audio, I think a better fit is phased.FrostBeamformer. The underlying principle of a Frost beamformer is simialr to MVDR beamformer but the implementation is in time domain instead.

HTH

[Ivana Jovanovic]

Thank you very much for your promt answer! I am testing different beamformers (from Phased Array toolbox) among which I also test Frostbeamformer. So I would like to add SubbandMVDR as well.

Would it be possible that I module my audio signal such that the requirements for SubbandMVDR are fullfill? To do so I would also need to know what modulation/demodulation is assumed in SubbandMVDR?

[Honglei Chen]

You could try to use phased.WidebandCollector to simulate either modulated or unmodulated received signal at the array. This wil work if you have a single audio clip as the source. If you already have the measurement at each receiving element, then the function above won't work.

HTH