Thread Subject: real-time data acquisition from a custom device

I try to receive and process sound data frame by frame from a custom audio input board with USB interface in MATLAB. I have used this board through windows drivers and C APIs successfully in C world.

At first, I made a data receiving thread with C-MEX to copy frame buffers and call matlab functions to process and visualize the data. But, I realized that mex functions like mexCallMATLAB are not thread-safe functions. I had no idea to proceed.

Next, I noticed that the DAQ toolbox adaptor kit may work. Here, I don’t want to implement complicated timing codes. Just need places for Init, Start, Stop function and a thread for calling a MATLAB function with a sound frame.

Do you have any idea or suggestion?
Other fancy solutions are welcome.

If the use of DAQ toolbox is best, I need simple examples or tutorials relevant to my problem.

Thanks in advance.

Hi,
If your device adheres to the Windows MME interface
(see http://msdn.microsoft.com/en-us/library/aa909811.aspx)
it can be supported by Data Acquisition Toolbox. There are some limitations you can read about here:
http://www.mathworks.com/access/helpdesk/help/toolbox/daq/f5-54943.html
http://www.mathworks.com/support/solutions/data/1-19SDX.html
The winsound interface constrains the sound card to up to 24 bits per sample,
with the default set to 16. This help page gives more information
http://www.mathworks.com/access/helpdesk/help/toolbox/daq/bitspersample.html

If your device does adhere to Windows MME then you can see examples and documentation here:
http://www.mathworks.com/access/helpdesk/help/toolbox/daq/daq.html
http://www.mathworks.com/products/daq/demos.html

Sherryl

Thanks for your reply, but my device doesn't adhere to Windows MME.