Native 16kHz sampling rate.

[bolom]

Hi Matt,

Would it be possible to add native 16kHz sampling rate?
I am processing speech, most speech applications run at 8kHz and 16kHz.

Great product!

Thanks
bolom

[bolom]

Hi,

Is 16kHz supported native?

According to file linux/sound/soc/bcm/audioinjector-pi-soundcard.c the constraint table does include 16000, but when I try to record a 16k it defaults to 8k, like this,

pi@raspberrypi:~ $ arecord -Dhw:0,0 -c2 -r16000 -fS16_LE test.wav
Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 16000 Hz, Stereo
Warning: rate is not accurate (requested = 16000Hz, got = 8000Hz)
please, try the plug plugin
^CAborted by signal Interrupt...
pi@raspberrypi:~ $

Thanks

[flatmax]

Hi,

The card supports the rates listed at the top of this file :
https://github.com/raspberrypi/linux/bl ... oundcard.c

Hmmm ... not sure why it doesn't work. With the latest kernel I can't record at 8000 Hz ... although an downdate made it work again ... by rolling back my kernel to version 4.9.14 :

Code: Select all

 sudo rpi-update b30461d2621e71eb9b8845b38738af177b9181ed

I tried downdating to kernel 4.4.33 :

Code: Select all

sudo rpi-update 3ffa1c624ae8b5f02a6aac764d407e8d3b5a09bb

Seems not to work at any of these kernels.

I have submitted an issue with the rpi kernel on this topic :
https://github.com/raspberrypi/linux/issues/2176

Matt

[Amr]

Dear Matt;

I am also trying to record at sample rate of 8000 Hz, but it is not working. Any updates regarding this issue?