How can I find the maxima and minima of a signal using labview? I want to draw a upper and lower envelop.

[victorchoy]

Dear All,

How can I find the maxima and minima of a signal using labview? I want to draw a upper and lower envelop.

Victor

[Andy_C.]

You can use Array Max & Min VI to find the max/min value for an array

[victorchoy]

Thanks. But where can I find this VI? I want to find the local maximum and minimum. Then I want to draw the envelop.

Victor

[smercurio_fc]

You mean like a modulation? Are you part of the same group that seems to be asking all about modulation this week? Like this one, this one, and this one.

[victorchoy]

No. I just want to draw the upper envelop and lower envelop.

[Dennis_Knutson]

I'm not sure exactly what you are looking for. Do you need help in how to use the Limit Testing function on the Signal Processing>Waveform Measurement>Waveform Monitoring palette? The Mask & Limit Testing Express VI can also be used. That allows you to draw the limits on a graph. What is the type of signal?

[victorchoy]

This is my signal. I want to find out all the local maximum and minimum point then draw the envelop. Which function in the labview should I use? Thanks.

Victor

[esmaham]

I would search the array to find the MAX and Min values and draw them as constant lines then. You can use the function “Array MIN & MAX” to do that.