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matrix-io / matrixio-kernel-modules

MATRIX HAL in kernel space
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Noise when recording #22

Closed Romkabouter closed 6 years ago

Romkabouter commented 6 years ago

Hi, I have the kernel modules installed on a pi with raspbian stretch. I have found the recordings having distorted background noise. This is the case with arecord AND pyadio. I have used the same code with an USB mic and the quality is much better, that is to say, only my voice is recorded and now skreaking background is heard.

Is there a way to get a cleaner output?

PS: I have MalOS NOT installed, so there is no interference from that part

nodered commented 6 years ago

I had the same problem when I installed the new kernel modules the other day. I commented out the dummy sound module from /etc/modules-load.d/matrix-mics.conf ...rebooted and the sound was clean again? This will change the array/card index number (hw:X,0) so if you have /etc/asound.conf or /home/pi/.asoundrc you will have to edit those after the change.

I don't know why this fixes the noise issue? Anyone?

Romkabouter commented 6 years ago

Good find, I will try that as well

Romkabouter commented 6 years ago

Unfortunatly, did not help. I think I did not have these issues when using HAL, I will try it to check if this is hardware related

nodered commented 6 years ago

I'm using the Matrix Voice and disabled some of the kernel modules, currently I just have the following modules loading at boot. matrixio_pcm matrixio_codec matrixio_uart matrixio_core

I was curious about the install process for the Matrix Voice, what are the essential modules that need to be loaded?

eljuguetero commented 6 years ago

Hi, We just found a bug in the kernel overlay file. please run:

sudo apt-get update
sudo apt-get upgrade

then

sudo reboot

BR

Romkabouter commented 6 years ago

I have just tested this with a clean stretch install and kernel install (not building from source) The noise is gone, so for me this issue can be closed