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USING DAQ TOOLBOX TO ACQUIRE MICROPHONE ARRAY DATA USING NI USB 9234

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Hello,
I am trying to use DAQ toolbox to measure microphone Array data using NI USB 9234.
In LabVIEW, I configure the device using sound pressure measurement mode.
But, I don't know how to do that in MATLAB DAQ toolbox.
My code is:
clc;
clear all;
i=0;
ai=analoginput('nidaq','Dev1');
chan=addchannel(ai,1);
set (ai, 'SampleRate', 1700);
set(ai.Channel, 'UnitsRange', [0 135]); /* tried it in both volts range and db range*/
set(ai.Channel, 'Units', 'dB');
set(ai,'SamplesPerTrigger',inf);
%%start acquisition
start(ai);
while isrunning(ai)
[data,time]=getdata(ai,1);
i=i+1;
data1(i,1)=data;
end
stop(ai);
Data that's being saved seems to contain only noise. I don't see any sound data i it.
It would be great if someone could tell me how to acquire sound data using the toolbox.
Thanks, Haritha

Answers (2)

Manisha
Manisha on 13 Feb 2012
Hi Haritha,
NI 9234 has built-in IEPE excitation circuitry. Is your microphone IEPE compliant?
If yes, you can use the new feature added in session based interface for your microphone. R2012a pre-release has added a new specialized measurement type called 'Microphone'. This will turn on the IEPE excitation on your device and thus return meaningful results
You may need to modify the following code:
s = daq.createSession('ni');
s.addAnalogInputChannel('Dev1', 0, 'Microphone');
s.Channels.Sensitivity = 0.037; %Set the microphone's Sensitivity to the value specified in the sensor's data sheet in v/Pascals.
[data,time] = s.startForeground();
Hope that helps,
Manisha
  2 Comments
HARITHA
HARITHA on 13 Feb 2012
Thanks a lot for your reply.
Yes, my microphone is IEPE compliant.
Can I do it with R2011b version of MATLAB which has version 3.0 DAQ toolbox?
Thanks,
Haritha
Atiqah Selamat
Atiqah Selamat on 12 Jun 2013
i am using this code but do not how to check where it did save my recording.

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Vinh Dang
Vinh Dang on 5 Mar 2015
Hello, In my application, I have a cDAQ configuration with AI modules 9234 (for accelerometers), 9237 (for pressure and load cell) and 9215 (for proximity and temperature). All modules are put in one chassis cDAQs-9178. What is the valid sampling rate for this?

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