How to access both channels of soundcard

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seme
seme 2013-9-8
Could anyone has any idea how i could access both channels of sound card at the same time .
Thank you

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Jan
Jan 2013-9-8
It depends on what "access" exactly means. If you show us, how you access one channel, an answer might be very easy. If you e.g. use the audio-recorder and mean capturing a stereo signal, there should not be a problem at all.
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Walter Roberson
Walter Roberson 2013-9-8
Right, it normally happens automatically if you are using the default audio.
If the sound card is being access through the data acquisition toolbox then we need to know more about it.
seme
seme 2013-9-9
编辑：Walter Roberson 2013-9-9
Thank you Jan Simon
Here is an example code to output to the sound card that i try
AO = analogoutput('winsound',0);
chan = addchannel(AO,2);
duration =1;
SampleRate = 44100;
set(AO,'SampleRate',SampleRate)
set(AO,'TriggerType','Manual')
NumSamples = SampleRate*duration;
x = linspace(0,2*pi*500,NumSamples);
y = linspace(0,(2*pi*500)-1.57,NumSamples);
data = sin(x)';
data1=sin(y)';
putdata(AO,data)
start(AO)
trigger(AO)
waittilstop(AO,5)
delete(AO)
clear AO
what i want is to output the data1(Sin(y)) in the second channel(channel 2)) , while I send to data(Sin(x)) sound card to channel 1
Thank you

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