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respeaker / mic_array

DOA, VAD and KWS for ReSpeaker Microphone Array

Home Page:https://www.seeedstudio.com/ReSpeaker-Mic-Array-Far-field-w--7-PDM-Microphones--p-2719.html

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Reference angle in DOA algorithm

xaviliz opened this issue · comments

commented

Hi mate,

I am testing DOA algorithm with Respeaker Core v2 with test_8mic(), can you tell me which would be the reference angle (0 degrees)? Thanks in advance,

XL

commented

For the respeaker core v2, you can use https://github.com/voice-engine/voice-engine/blob/master/examples/kws_doa_alexa_respeaker_v2.py

The test_8mic() is for respeaker usb 6+1 mic array.

commented

Hi @xiongyihui,

alright, I was testing that script but I have not installed Alexa and some errors appeared. I will revise it again later. But can you tell me where the reference of DOA algorithm is located? Between MIC1-MIC2, MIC1 or MIC5?

Thanks for your time,
XL

commented

MIC2 is the reference angle. The green LED (default pattern) indicates the direction.

It seems the DOA is not accurate, will check it.

commented

ok, thanks for your prompt response. Yes, I am agreed DOA is randomly detecting angles. I have realized it is detecting the angle of a source and suddenly it provides its complementary angle. I suspect that's because sound is passing through the array and it is detecting when it arrives to the other side, could it be possible? another think that I have detected is that Respeaker GCC implementation is using only some pair of microphones not all possible pairs (MIC1-MIC2, MIC1-MIC3, MIC1-MIC4, etc...).