generate limit waveforms (envelope) from waveform

[srapp@moog.de]

Hello,

I want to read in a waveform and then generate a upper and lower limit waveform such as according the attached picture.

is there a function in lab view available which does the calculation of the limit functions for all possile waveforms (sine, rectangle...etc.. or does somone have programmed this and can give me the code.

It would be also much helfull if someone has this in the C (Lab Windows)

regards samuel

[Andre_Saller]

This issue is discussed in detail in this thread:

http://forums.ni.com/ni/board/message?board.id=170&message.id=153740&requireLogin=False

[srapp@moog.de]

Andra Thank You,

but I only have LV 6.i

works this also with LV 6.i?

I also have LabWindows 7.1

Is this function also available for LabWindows?

regards

samuel

[Andre_Saller]

I have CVI 8.1 and the function is available, too. I don´t have access to these old versions right now, so you have to check this out yourself.

[srapp@moog.de]

Andre,

what is the name of the function in CVI 8.x

regards

samuel

[Andre_Saller]

FastHilbertTransformation() is the name of the Function in CVI, about which the other thread is talking...

[srapp@moog.de]

Hello all and Andre, I have another question,

when I want to use the enveloppe.vi in teststand which is discussed in the link which you sent above it asks me for the following vi s

"Fast Hilbert Transform.vi"

"1D Rectangular To Polar.vi"

"Read From Spreadsheet File.vi"

But I only can find the following vi s:

"hilbert.vi"

"Read Write Spreadsheet File.vi"

"File Read Spreadsheet.vi"

"File Read Spreadsheet to Table.vi"

when I want ot use "hilbert.vi" instead of "Fast Hilbert Transform.vi"  it asks me to select "Fast Hilbert Transform.vi" again.

how can I solve this problem?

regards samuel