Problems with Matlab to capture samples on Digiducer 333D01 under Ubuntu 16

2 次查看（过去 30 天）

Chris Chow 2016-10-18

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/307885-problems-with-matlab-to-capture-samples-on-digiducer-333d01-under-ubuntu-16

I'm using Ubuntu version 16 and am trying to use Matlab functions to capture samples on the Digiducer accelerometer (333D01). I go to System Settings under the OS and select that device. I check under audiodevices that Matlab does recognize as ALSA device. However when I run the code below which "shaking" the device, I don't seem to be able to capture anything. I get some random fluctuations close to zero.

---------------------------------------------------------------------------- release(H); % Under SystemSettings->Sound->Input, under Record sound from: Microphone (333D01)

H = dsp.AudioRecorder('DeviceName', '333D01 10595173209464075160919: USB Audio (hw:2,0)', ... 'SampleRate', 22050, ... 'NumChannels', 1, ... 'DeviceDataType', '16-bit integer', ... 'BufferSizeSource', 'Property', ... 'BufferSize', 4096, ... 'QueueDuration', 1.0, ... 'SamplesPerFrame', 1024, ... 'OutputDataType', 'double');

[SN, CalA, CalB, CalDate, version] = DigiDecoder(); CalA = CalA / 256; % scaled for 16-bit values CalB = CalB / 256; % scaled for 16-bit values

AUDIO = step(H); y = ((2^16)/(1*CalA)*AUDIO); -----------------------------------------------------------

when I call the AudioRecorder, I see the following error in my Linux command line

ALSA lib pcm_dsnoop.c:606:(snd_pcm_dsnoop_open) unable to open slave ALSA lib pcm_dmix.c:1029:(snd_pcm_dmix_open) unable to open slave ALSA lib pcm.c:2266:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear ALSA lib pcm.c:2266:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe ALSA lib pcm.c:2266:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side ALSA lib pcm_dmix.c:1029:(snd_pcm_dmix_open) unable to open slave