Microphone Array Recording Test

First check the Getting started

Update and upgrade the raspbian

sudo apt-get update
sudo apt-get upgrade

Install Alsa tools and the sox utility

sudo apt-get install sox alsa-utils 

Run the volumen control

alsamixer

Install and compile the MATRIX Creator's hardware abstraction layer

git clone https://github.com/matrix-io/matrix-creator-hal.git
cd matrix-creator-hal 
mkdir build && cd build
cmake ..
make

Run capture and check the recorded files cd demos ./micarray_recorder ls -1 *raw

Convert the audio

sox -r 16000 -c 1 -e signed  -b 16 mic_16000_s16le_channel_0.raw channel_0.wav
sox -r 16000 -c 1 -e signed  -b 16 mic_16000_s16le_channel_1.raw channel_1.wav
sox -r 16000 -c 1 -e signed  -b 16 mic_16000_s16le_channel_2.raw channel_2.wav
sox -r 16000 -c 1 -e signed  -b 16 mic_16000_s16le_channel_3.raw channel_3.wav
sox -r 16000 -c 1 -e signed  -b 16 mic_16000_s16le_channel_4.raw channel_4.wav
sox -r 16000 -c 1 -e signed  -b 16 mic_16000_s16le_channel_5.raw channel_5.wav
sox -r 16000 -c 1 -e signed  -b 16 mic_16000_s16le_channel_6.raw channel_6.wav
sox -r 16000 -c 1 -e signed  -b 16 mic_16000_s16le_channel_7.raw channel_7.wav

Play the wave file (i.e. audio from channel 0)

aplay channel_0.wav