I have played with micarray_recorder in HAL demo and I can get upto sampling rate upto 48 KHz across 8 channels by using the ‘SetSamplingRate’ function in microphone_array.cpp. Is it the highest sampling rate possible ? I tried with 96KHz with no success. Does the Matrix Voice support microphone recording upto 96 KHz across 8 channels ?
Hi @swadhinp,
Currently, only frequencies from 8 kHz to 48 kHz are supported. Do you specifically need 96 kHz?
Yes, I do need 96KHz sampling rate and that is one of the reason I bought matrix voice or creator. I remember that you guys have promised to provide 96Khz sampling rate. I want to record ultrasonic signals of higher frequency and 96KHz will allow me to record upto 48KHz. Will there be any future update regarding this ?
Hey! @swadhinp good news!
Is not currently available but I just double checked and 96Khz will be included in next releases. I will personally let you know here in this post.
Is 96KHz available now?
yes it is. 
Does it need special settings?
To test whether it works, I simply changed the frequency values in micarray_recorder_direct.cpp from 16000 to 96000. I recorded 1000hz tone. Sampling frequency 16000, 48000 did record the 1000hz tone correctly and I was able to convert it to wav and play it. However, when I changed it to 96000, the recorded tone became distorted to a lower tone and was noisy.
Has anyone successfully used 96khz? If so, what am I doing wrong?
Hello @kaios0002,
I use the matrixio-kernel-modules and run the following command:
$ sudo apt install sox
$ rec -r 96000 -c 8 96KHz.wav
Input File : 'default' (alsa)
Channels : 8
Sample Rate : 96000
Precision : 16-bit
Sample Encoding: 16-bit Signed Integer PCM
In:0.00% 00:00:06.83 [00:00:00.00] Out:654k [ |- ] Clip:0 ^C
Aborted.
Best Regards,
Kevin Patino
Great. I am able to record in 96Khz now. Have you succeeded to get 8 separate files? I have tried the -I option in arecord but did not work.