I'm trying to implement a tracking system (undergrad thesis) using DOA of acoustic signals. I'm testing this by playing a 2kHz sound and receiving the signal with four microphones in a ULA.
So, the band I'm interested in is narrowband but naturally the signal received is wideband.
I have been able to successfully implement a time delay beamformer however when I have tried to implement a phase shift beamformer I have failed.
My suspicion is that you can only perform phase shift beamforming techniques on narrowband signals and will not work even if you are looking for a narrowband within a wideband signal. Am I correct?
If so, will a simple filter be good enough to correct this issue to transform the signal into a narrowband one?