An anolog signal will be received by my computer through the microphone input. The signal will be in the form of a pulsed tone. Can I use LabView to count the number of pulses per minute, and determine the frequency of the tone?

[JohnChimpo]

I am currently evaluating LabView 7.0, in hopes that it will be useful in my needed application, however, I am unfamiliar with its capiblities. The tone and pulses per minute are two independent pieces of data, one is windspeed, and the other temperature. After the device is calibrated the two pieces of data will be used to determine windchill.

[Joe_H]

labview has an express VI in 7.0 that will give you the frequency easily. and there are many examples of doing this. use the help find examples to see them

[Khalid]

Hi John,

LabVIEW 7 has VIs (functions, basically) which allow one to "read" from the microphone (via the sound card), etc. If you have the Evaluation version of LabVIEW 7 you may want to try this out quickly. As a starting point, you may use the shipping example -- Launch "Find examples.." from the Help menu, and search for "sound"

Regards,

Khalid

[JohnChimpo]

Sweet, I found the example that interfaces with the sound card and displays frequency, but how would I go about editing this loop to count pulses per minute?

[JohnChimpo]

Sweet, I found the example that interfaces with the sound card and displays frequency, but how would I go about editing this loop to count pulses per minute?

[JohnChimpo]

I'm tyring to implement the tone express VI for frequency, but Im uncertain how to get it to plot it as a tone vs time graph... do you know of any tutorials?

[Jeremy Braden]

If you have the frequency, you can find pulses per minute by multiplying by a scalar.