MATLAB: Is it possible to process two microphones input in real time using DSP Toolbox?

Question

I have been trying to implement active noise cancellation system using dsp system toolbox. I have used the dsp.AudioRecorder and AudioPlayer as well. Here is my initialization code.

mic_reference = dsp.AudioRecorder('NumChannels',1);
mic_reference.DeviceName='ASIO4ALL v2'; 
mic_error = dsp.AudioRecorder('NumChannels',1);
mic_error.DeviceName='ASIO4ALL v2';
sink1_2 = dsp.AudioPlayer;
sink1_2.DeviceName='ASIO4ALL v2';

when I call step(frame) for each of the microphone. I am getting error saying that

'Error using AudioRecorder/step A given audio device may only be opened once.'

Is it the limitation of dsp system toolbox to be able to operate only one audio recorder device at a time? or is it possible to use two audio recorder devices at a time ?

There is a provision for multichannel processing of the same audio device but how to process the audio from two independent devices in real time ?

Answer 1

You used the same device name for both of them. You need to distinguish the devices.

http://www.mathworks.com/matlabcentral/answers/114717-select-devicename-for-dsp-audiorecorder-and-dsp-audioplayer