Select 'DeviceName' for dsp.AudioRecorder and dsp.AudioPlayer

I was wondering if the DSP blocks have a way of listing the available audio devices in my computer similar to what the audiodevinfo function does? The problem I'm having is that when I use audiodevinfo it only returns a partial name of the available devices and not the full name of the device so I can't assign this name to the DeviceName parameter in dsp.AudioRecorder or dsp.AudioPlayer from the Command Window in MATLAB...

so, this is what I'm doing:

h = dsp.AudioPlayer;

h.DeviceName = audiodevinfo(0,1);

and, this is the error I get:

??? Error using ==> CompEnum.findMatch at 60 Communications Headphones (IDT is not a valid setting for the DeviceName property.

Error in ==> C:\Program Files\MATLAB\R2010b\toolbox\shared\system\+matlab\+system\@APIProp\APIProp.p>APIProp.checkForEnumProp at 433

I appreciate any help I can get!

Answer 1

[Wayne King]

Enter

devinfo = audiodevinfo;

then look at

devinfo.output

the name there should be a valid DeviceName property.

The easiest way is to use tab completion on the System object property

h = dsp.AudioPlayer;

then type the following

h.DeviceName = '

after you type the first single quote, hit the TAB key, you should see a list of valid device names.

[Daniel Jimenez]

Thanks for your reply Wayne, that's what I've found so far but it's not quite what I'm looking for. You see, when I type:

devinfo = audiodevinfo;
devinfo.output.Name

I get:

ans =
HDMI PDP (Intel(R) Display Audi
ans =
Communications Headphones (IDT 
ans =
Speakers and Headphones (IDT Hi

I can't use neither of these strings to specify the DeviceName property for dsp.AudioPlayer since none of them has the complete name of the device, therefore returning the aforementioned error.

What I would like is to be able to get the complete names of the devices in order to use them in a popup list object in a GUI so I can assign them to the DeviceName property of dsp.AudioPlayer without using the tab completion for it.

Is there a way of doing this?

[Daniel Jimenez]

I found that dspAudioDeviceInfo retrieves the information I need to display in regards to the name of the default interface that MATLAB is using for dsp.AudioRecorder and dsp.AudioPlayer. Thanks for your reply Wayne!

Answer 2

[Wayne King]

Hi Daniel, can you try this:

 To select or change the Audio Hardware API, select Preferences from the MATLAB Toolstrip. Then select DSP System Toolbox from the tree menu. You should see which audio hardware API you can choose from.

[Daniel Jimenez]

Yes, of course. In the Preferences from the MATLAB Toolstrip, under the Signal Processing Blockset leaf from the tree menu (there is no DSP System Toolbox leaf) I found:

Audio Hardware API

Select the API that is used to communicate with the audio hardware (soundcard) for the To and From Audio Device blocks, and the dsp.AudioPlayer and dsp.AudioRecorder System objects.

 (*) Windows DirectSound
 ( ) Windows WMD-KS

Selecting the Windows WMD-KS radio button causes that when creating a new dsp.AudioPlayer Object it doesn't find any output devices.