How can i set block parameters from m-file?

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Sergio 2013-10-31

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评论： Sergio 2013-11-12

Hi,

I´m using simulink dsp toolbox in order to record and reproduce audio and i need to let the user of my future program, to be able to select the Device to record/reproduce from a GUI.

Therefore it has to be handled from an m-file.

I tried the following without success:

My intention here was to see were the value was stored in order to change it later.

- ParameterValue = get_param('Model/Subsystem/From Audio Device','DialogParameters')

- ParameterValue = get_param('Model/Subsystem/From Audio Device','ObjectParameters')

Both commands result in a structure with multiple parameters but i could not find where the value of the currently selected sound card is.

I need to be able to set "From Audio Device" and "To Audio Device" Device name according to the available sound cards installed. Ideas?

Thanks in advance!

PD: I need to use simulink blocks, so no dsp.audiorecorder, or DAQ to stream audio.

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Answer 1

Puneet Rana 2013-11-12

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Hello Sergio,

'DeviceName' is the property of the 'To Audio Device' and 'From Audio Device' that contains the currently selected audio device in that block. You can access it using:

>> get_param('Model/From Audio Device', 'DeviceName')
ans =
Default
>> get_param('Model/To Audio Device', 'DeviceName')
ans =
Default

and similarly set the property using set_param.

Another tip: Since you mentioned that you will be using a GUI where the user can select an audio device from a list, it may be a good idea to populate that list using 'dspAudioDeviceInfo' function. This function returns a list of all audio devices on the current computer, it would be the same as the drop-down list in 'From Audio Device' or 'To Audio Device' blocks.