[SoX-users] Confused about SOX and ALSA

[<pf...@fa...>]

Hello List

I have a high sample rate (250 khz) USB microphone.

I've tried to record from it using matlab, audacity and the command tool
arecord. However, to no avail. All these tools return the same error:
the sample rate is wrong.

However, using sox, I can record without problems. Generating a
spectrogram from sound with a known frequency confirms that the sample
rate is indeed 250khz - also the files contain (give or take some
samples) the correct number of samples.

So, my question is, why can i record using sox but not any of the other
tools. In case it helps, I have attached the sox output below.

Best
Peter

----------------
rec:      SoX v14.4.1

Input File     : 'hw:2,0' (alsa)
Channels       : 1
Sample Rate    : 250000
Precision      : 16-bit
Sample Encoding: 16-bit Signed Integer PCM
Endian Type    : little
Reverse Nibbles: no
Reverse Bits   : no

rec INFO sox: Overwriting `test.wav'

Output File    : 'test.wav'
Channels       : 1
Sample Rate    : 250000
Precision      : 16-bit
Sample Encoding: 16-bit Signed Integer PCM
Endian Type    : little
Reverse Nibbles: no
Reverse Bits   : no
Comment        : 'Processed by SoX'

rec INFO channels: has no effect in this configuration
rec INFO sox: effects chain: input       250000Hz  1 channels
rec INFO sox: effects chain: highpass    250000Hz  1 channels
rec INFO sox: effects chain: vol         250000Hz  1 channels
rec INFO sox: effects chain: spectrogram  250000Hz  1 channels
rec INFO sox: effects chain: dither      250000Hz  1 channels
rec INFO sox: effects chain: output      250000Hz  1 channels
In:0.00% 00:00:04.33 [00:00:00.00] Out:1.07M [      |      ]       
Clip:0    ^C
Aborted.