error -20308 using Sound input VI

[rcard537622]

I am unsing the LabView sound input example.

I am measuring a 1 kHz tone on the microphone input.

I get Error -20308 which I suspect is a error due to the sampling rate.

How can i modify the program so if enough samples are not ready the VI will load more and not error out.

[Sam_Sharp]

There are a few options:

The bottom two are based on the number of samples, the top one uses the dt to get the duration of the waveform in seconds. Because you have an array of waveforms (two channels), you'll need to index out one of the waveforms first (I think).

[Artem.SPb]

Please, show your read settings and use vi snippet.

[rcard537622]

OK here is the snippet. I have never done a snippet before lets see if this works.

[Artem.SPb]

Did you see any signal on Waveform graph?
This code work if sound enough loud.

[rcard537622]

The program works as long as there is a signal to measure.

But if the signal goes away the program errors out.

I need the program to keep running and report the frequency as 0 Hz.

Is that possible useing the Express VI?

I was thinking it was a sample problem?

Any ideas guys?

[Sam_Sharp]

Did you look at my answer? I gave you multiple methods to work out the length of the waveform. Of course, if the data you have doesn't actually make the transition (i.e. if your threshold is too low/high) then the express VI will return an error - if it errors, you can put a case structure and wire the error wire to it and inside the error case, wire a 0 to your frequency.

[rcard537622]

I will try that today, thanks.