Unable to record at 2 kHz

[whalechaser]

I am attempting to record 1 channel at 2 kHz using arecord and get this error:

pi@raspberrypi:~/Recordings $ Recording WAVE 'stdin' : Unsigned 16 bit Little Endian, Rate 2000 Hz, Mono
arecord: set_params:1233: Sample format non available
Available formats:
- S16_LE
- S24_LE
- S32_LE

Does the board not support lower thank 8 kHz?

[flatmax]

Hi there,

You can software resample to get a rate lower then 8 kHZ. Use the dsnoop plugin to reduce the rate below this.

I have tried to use dsnoop at a 2 kHz sample rate. This is what I got :

Code: Select all

pi@raspberrypi:~ $ arecord -Dplug:dsnoop -fS16_LE -r 2000 -c2 /tmp/test.wav
Recording WAVE '/tmp/test.wav' : Signed 16 bit Little Endian, Rate 2000 Hz, Stereo
Warning: rate is not accurate (requested = 2000Hz, got = 4000Hz)
         please, try the plug plugin 

It seems that the software resampler is limited to 4 kHz as the lowest rate.

Hope this helps.
Matt

[whalechaser]

Great - this solution did work for recording @ 4 kHz on my Pi, which will be sufficient for my project.

Thank you,

Chris