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From: Shane on 8 Apr 2010 01:48
I am trying to get an external audio signal to trigger 2 second data acquisition within Matlab. ie.. the audio is a stimulus, which also signals for matlab to begin recording EEG responses to the audio.

Currently I have the audio signal connected to the 'mic in' of the windows sound card, while the EEG signals go to a National Instruments DAQcard 6024E.

When I try to set this up I receive this error:
"??? The channel must be from the same parent"

Does this mean that Matlab cannot use two different D/A convertors simultaneously (the windows sound card and the National Instruments DAQcard)?

I don't think it's possible for me to route the audio into the NI DAQcard input, which would fix my problem.

Any help would be much appreciated. I'm pretty new at Matlab.

Thank you,

Shane


Detailed info:

*My .m file

ainidaq = analoginput('nidaq',1);
chanR = addchannel(ainidaq,0);

aiwinsound = analoginput('winsound',0);
chanT = addchannel(aiwinsound,1);

duration = 2;
set(ainidaq, 'SampleRate',10000);
ActualRate = get(ainidaq,'SampleRate');

set(ainidaq,'SamplesPerTrigger',ActualRate*duration);
set(ainidaq,'TriggerChannel',chanT);
set(ainidaq,'TriggerType','Software');
set(ainidaq,'TriggerCondition','Rising');
set(ainidaq,'TriggerConditionValue',1);
set(ainidaq,'TriggerFcn','mycallback');
start(ainidaq);

waittilstop(ainidaq,20);
delete(ainidaq);
clear ainidaq;


*the error:

Warning: Support for the National Instruments
Traditional NI-DAQ driver will
not be provided in future releases of Data
Acquisition Toolbox.
Instead, it will be available as a separate
download.
Consider upgrading to the NI-DAQmx version if it
supports your hardware.
See Solution 1-5LI9NF for details.
??? The channel must be from the same parent.

Error in ==> daqdevice.set at 228
set(x.uddobject(i), prop, val);

Error in ==> trigger2 at 12
set(ainidaq,'TriggerChannel',chanT);
From: Shane on 8 Apr 2010 23:39
bump? :)
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