Two I2S MEMS microphones stereo record issue with Raspberry Pi 3a+

Moderators: adafruit_support_bill, adafruit

Forum rules
Talk about Adafruit Raspberry Pi® accessories! Please do not ask for Linux support, this is for Adafruit products only! For Raspberry Pi help please visit: http://www.raspberrypi.org/phpBB3/
Locked
User avatar
frank984
 
Posts: 1
Joined: Sun Jan 15, 2023 6:59 am

Two I2S MEMS microphones stereo record issue with Raspberry Pi 3a+

Post by frank984 »

Hello,
following the instruction reported https://learn.adafruit.com/adafruit-i2s ... iring-test I have connected two I2S microphones to a Raspberry Pi 3A+. The microphones are connected by wire about 20 cm long.
On the left channel I have this issue while the right cnannel is recorded correctly without any noise:
Image
Also exchanging the microphone order between L and R, the result, doesn't change.
Some other details: sampling rate of 48 kHz with 24-bit resolution, 2 channel as obvious and 2^12 buffer.
Any idea to overcome this issue?
Attachments
Immagine 2023-01-15 120537.png
Immagine 2023-01-15 120537.png (18.76 KiB) Viewed 52 times

User avatar
mikeysklar
 
Posts: 13824
Joined: Mon Aug 01, 2016 8:10 pm

Re: Two I2S MEMS microphones stereo record issue with Raspberry Pi 3a+

Post by mikeysklar »

When record with arecord did you see the VUmeter at the bottom react when using this command:

Code: Select all

 arecord -D plughw:0 -c2 -r 48000 -f S32_LE -t wav -V stereo -v file_stereo.wav
Can you paste in the output of arecord -l?

Can you post a photo of the wiring to confirm that is all correct.

Locked
Forum rules
Talk about Adafruit Raspberry Pi® accessories! Please do not ask for Linux support, this is for Adafruit products only! For Raspberry Pi help please visit: http://www.raspberrypi.org/phpBB3/

Return to “Adafruit Raspberry Pi® accessories”