ReSpeaker 4-Mic Array for Raspberry Pi

ReSpeaker 4-Mic Array

Version pour Raspberry Pi

Montage

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Assurez-vous que les broches sont correctement alignés.

Attention le branchement à chaud peut endommager ReSpeaker .

Veuillez faire l’assemblage avec le Raspberry Pi une fois cette dernière éteint (Power Off)

section 3

Step 2. Get the seeed voice card source code.

	sudo apt-get update
	sudo apt-get upgrade
	git clone https://github.com/respeaker/seeed-voicecard.git
	cd seeed-voicecard
	sudo ./install.sh
	reboot

section 4

Step 3. Then select the headphone jack on Raspberry Pi for audio output:

	sudo raspi-config
	# Select 7 Advanced Options
	# Select A4 Audio
	# Select 1 Force 3.5mm ('headphone') jack
	# Select Finish

section 5

Step 4. Check that the sound card name looks like this:

	pi@raspberrypi:~/seeed-voicecard $ arecord -L
	null
		Discard all samples (playback) or generate zero samples (capture)
	playback
	capture
	dmixed
	array
	ac108
	default:CARD=seeed4micvoicec
		seeed-4mic-voicecard,
		Default Audio Device
	sysdefault:CARD=seeed4micvoicec
		seeed-4mic-voicecard,
		Default Audio Device
	dmix:CARD=seeed4micvoicec,DEV=0
		seeed-4mic-voicecard,
		Direct sample mixing device
	dsnoop:CARD=seeed4micvoicec,DEV=0
		seeed-4mic-voicecard,
		Direct sample snooping device
	hw:CARD=seeed4micvoicec,DEV=0
		seeed-4mic-voicecard,
		Direct hardware device without any conversions
	plughw:CARD=seeed4micvoicec,DEV=0
		seeed-4mic-voicecard,
		Hardware device with all software conversions

If we want to change the alsa settings, we can use

	sudo alsactl --file=ac108_asound.state store 

to save it. And when we need to use the settings again, copy it to:

	sudo cp ~/seeed-voicecard/ac108_asound.state /var/lib/alsa/asound.state

section 6

Step 5. Open Audacity and select AC108 & 4 channels as input and bcm2835 alsa: - (hw:0:0) as output to test:

	$ sudo apt update
	$ sudo apt install audacity
	$ audacity                      // run audacity

section 7

Step 6. Or we could record with arecord and play with aplay:

	arecord -Dac108 -f S32_LE -r 16000 -c 4 hello.wav    // only support 4 channels
	aplay hello.wav                                      // make sure default device
							     // Audio will come out via audio jack of Raspberry Pi