Hi,
I am looking to do audio signal processing in LabVIEW. I am using an electret microphone and the voltage signals are acquired by LabVIEW using LabJack U3. I need only the signals of certain frequency. So, I would like to first find the frequency of the incoming signals and filter them accordingly. I went through some LabVIEW programming that involves LabJack . I used "U3 eAIN Loop with Chart .vi" that is available in the LabJack website (https://labjack.com/support/software/examples/ud/labview )to obtain the signal and then connected it to power spectrum function to view the frequency. But, I couldn't achieve it correctly. I am not sure if this is a right way to do this. Please help me with this.
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Since you need to scan at at least twice the max frequency of interest, you probably need to use stream mode:
https://labjack.com/support/datasheets/u3/operation
Check out the example "U3 Stream with FFT.vi" from the LabVIEW_LJUD archive.
Thank you for your response. I will try this. Do I have to do anything in addition to make it work in stream mode?. Actually, I had amplified the microphone output using an op-amp and connected its output to AIN0. With this, can I just run the example or do I have to do some configuration?
Does the signal generally look okay? Perhaps do some intial testing with LJStreamUD to see if you have a decent looking signal coming in.