To create a FIFO array for DFT calculation and update array after each iteration

[lanister]

Hi all,

I'm currently working on DFT calculation of a real time signal withoutt using an FFT block, for that i need to store store particular length (say sampling period) of signal in an array . Using the elements of this array i'll calculate DFT using predefined equations.

After each DFT calculations, the array should get updated with values of  next sampling instants.

how to create this kind of queue..? 

[altenbach]

You probably should provide significantly more details, but maybe "fft ptbypt" would help.

[lanister]

Leave all that DFT calculation and everything.

I have a continuous periodic signal with me, (using Simulate Signal). i want 12 samples from each period, and i have to multiply each element with a constant and add them together and display the result. Then I have to get to get next set of samples and do the same until a stop condition is given.

Now can yu help..??

[altenbach]

Why don't you attach a simple VI showing how the data is generated?

Does one "period" contain exactly 12 samples or do yu want to select 12 random samples from each period. Are the 12 samples adjacent to each other? Is the multiplication constant always the same? (It would seem more efficient to add them first, then multiply with the constant afterwards. Less work!)