Datasheet

arecord -Dhw:0,0 -f S16_LE -r 16000 -c 2 hello.wav
aplay -Dhw:0,1 -r 16000 -c 2 hello.wav
# record 8 channels audio
# there are 6 microphones on board, and ac108 compose the 2 remaining channels.
arecord -Dhw:0,0 -f S16_LE -r 16000 -c 8 hello_8ch.wav
2. Test via PulseAudio
First check w hether the PulseAudio is running:
respeaker@v2:~$ ps aux|grep pulse|grep -v grep
respeak+ 1109 0.0 0.7 363272 7932 ? S<l 01:01 0:00 /usr/bin/pulseaudio --start --log-target=syslog
If it's not, please refer to PulseAudio's documentation to enable the auto-spaw n of PulseAudio. Then test via:
parecord --channels=8 --rate=16000 --format=s16le hello2.wav
paplay hello2.wav
Further more, the default ALSA device now hooks to PulseAudio, so using the follow ing commands also plays/records sound via PulseAudio:
arecord -v -f cd hello3.wav
aplay hello3.wav
So far w e learned the basic operations of the ReSpeaker Core v2 board, let's move forw ard. We can use ReSpeaker Core v2 to build our ow n AVS(Alexa Voice
Service) device or Dueros(Voice assistance of Baidu) device.
Play with AVS (Alexa Voice Service)
This guide w ill show s you how to build an AVS device based on the ReSpeaker Core V2.
Step 1. Install AVS library (Python)
respeaker@v2:~$ sudo apt update
respeaker@v2:~$ pip install avs
This w ill also install the follow ing executables into ~/.local/bin: alexa-audio-check, alexa-auth, dueros-auth, alexa-tap and alexa.
Tap the command below to Check the audio configuration:
respeaker@v2:~$ ~/.local/bin/alexa-audio-check
This script calculates the RMS of the sound recorded by the microphones.
Step 2. Authorize Alexa
Connect to the board via VNC. In the VNC desktop, open terminal and execute:
respeaker@v2:~$ ~/.local/bin/alexa-auth
This script w ill open the w eb brow ser automatically, the w eb brow ser w ill display a login page. Sign in w ith your Amazon account: