how to create fourier transform properties using labview

[NAdvwe]

Hi everyone

i am a new user to Labview and i only have 2 weeks left to complete an assignment.

This assignment involves the implementation of the various types of fourier transform properties using Labview. These properties include linearity, time shifting, frequency shifting, time scaling,

I do not really know how to implement them using Labview

PLS HELP!!!

Thanks

[andre.buurman@carya]

First of all do you know how to implement them on paper or with a different language or tool?

[NAdvwe]

i am using labview to implement the functions

[Eriquito]

Hi NAdvwe,

The NI Example Finder has several examples related to FFTs.  In LabVIEW, go to Help » Find Examples, click 'search' and type "FFT."

The example "FFT and Power Spectrum Units"  is a pretty good example of how to use LabVIEW's FFT function.

I think what Andre was saying is that, if you know the mathematical equations that you need to apply to achieve the transforms you are looking for, we could help you figure out how to convert them to LabVIEW code.

[NAdvwe]

i am refering to the fourier transform properties listed below:

A) time shifting

x(t-a) ------- >  exp (-jwa) X(w) 

For the time shifting property above, i have problem creating the exponential term using labview

B) time scaling

x(at)-----------> 1/a X (w/a)

C) Time convolution

Y(w) = F[h(t) * x(t)] = H(w)X(w)

where * stands for the convolution operation and F stands for fourier transform

Please provide diagrams if possible. Thank you

PLEASE HELP!!!!!!!!  THANKS!!!!!!!

 

[Eric_Cunningham]

There are many tools in LabVIEW to help you do that as long as you know how to implement them mathematically.  Some of these tools include the formula node, the formula express VI, exponential functions, and many other mathematical functions.

[NAdvwe]

i know about all the functions that u listed.

i need u to show me exactly how to create all the properties that i listed....

i need the actual diagram

thanks

[Eli_S]

Nadvwe,

As posted above you need to understand how the mathematics behind what you are trying to do work. If you know how to do this on paper, the you will be able to easily do it on LabVIEW using the functions Eric C. mentioned. I would recommend the formula node specifically.

Additionally, please look at this post which is similar to what you are trying to do.

http://forums.ni.com/ni/board/message?board.id=170&message.id=294686&requireLogin=False


Also, please understand that at this point you are asking someone to do your work for you and this is not what this resource is in place for.