How do I make use of all four channels of my four channel sound card using the Data Acquisition Toolbox?

Date Last Modified: Friday, June 26, 2009

Solution ID:		1-19SDX
Product:		Data Acquisition Toolbox
Reported in Release:		R12.1
Platform:		Windows
Operating System:		Windows Any

Subject:

Problem Description:

I am trying to acquire 4 channels simultaneously from a 4 channel soundcard using the Data Acquisition Toolbox. However, the 4 channels are presented as 2 Windows devices, so that in Windows --> Control Panel --> Multimedia, I am able to select channels 1 and 2 or channels 3 and 4. The MATLAB 'winsound' device only contains 2 channels, either 1 and 2 or 3 and 4.

Solution:

To see if MATLAB sees your soundcard as two analoginput objects, execute the following command:

daqhwinfo('winsound') ans.InstalledBoardIds
If MATLAB sees more than one InstalledBoardIds, then MATLAB recognizes two separate analoginput objects for your soundcard (probably ID's 0 and 1).

If this is the case, than you can access all four channels by creating two analoginput objects like this:

ai1 = analoginput('winsound',0) ai2 = analoginput('winsound',1)

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