The best place for this kind of question is:

http://www.mathworks.com/support

I hope somebody can help

I have a question about how to use a National Instruments PCI 6120 card with Matlab. The sampling frequency can go up to 1MHz, as far as I undesrtand from the specifications. However, with MatLab, I can’t set it greater than 500kHz.

set(ai,'SampleRate', Fe); % this is my input line
% Here is the Matlab answer
??? Error using ==> daqdevice/set
Unable to set SampleRate above maximum value of 500000.

Do you or anybody have heard about this problem? I am pretty sure there exists a way to force the NI card to a larger sampling frequency when it is given in the specifications of the card, maybe by changing some properties of the card using Matlab?
Thank you in advance for your answer.

– Guillaume

http://www.mathworks.com/access/helpdesk/help/techdoc/ref/audioplayer.html

I think that you might be able to get audioplayer to do what you want. I wonder if the click you are getting is because of a discontinuity between the end and beginning of the loop.

If you have Data Acquisition Toolbox, then you might be able to create and analog output and push data out that way and avoid the discontinuity problem also.

What kind of audio data are you attempting this with?

Doug

I have a question on how I can prevent clicks/pause while trying to
play a looped audio file (created in matlab) continuously.

The working example below plays a 1 second 100hz signal 5 times but I
can’t figure out a way to make it continuous so it doesn’t start and
stop with that pause/click. I tried to increase the array to like 30
seconds which would work but I want to run the loop for an hour or
three. When I tried this I ran out of memory (the array was just to
large to store in my 32bit 2gig ram windows system) Any suggestions/help

I also would like to be able to change the frequency (nSigRepeat) using a slider in a GUI and have it update / play the audio in realtime are their any video tutorials on this

clear;
fs=44100;
nSigRepeat=100; %how many times signal repeats in a second
nTimeIncreaseTo=1; %Duration of signal in seconds
x=linspace(0,nTimeIncreaseTo,fs);
y=sin(2*pi*x*nSigRepeat)*.8; %adjust amplitude by multiplying to
prevent clipping

xi=linspace(0,nTimeIncreaseTo,fs*nTimeIncreaseTo);
xi=xi';
yinterp=interp1(x,y,xi,'linear');
wavwrite(yinterp,fs,16,'c:\delHz.wav');

subplot(2,1,1)
plot(yinterp);
subplot(2,1,2)
plot(x,y);

%Plays audio file for 1 second 5 times at 100 hz.
for i=1:5
    soundsc(y,fs);
end;

tia sal22
and keep up the great work

You are best talking to htt://www.mathworks.com/support for this.

Thanks,
Doug

That is something that can be done. Do you have the Data Acquisition toolbox? What have you tried, can you connect to the board? What board is it?

Doug