Should I reset the FPGA FFT when changing the input signal?

Hello

I have an application based FlexRIO where I do FFT on several incoming signals. The signals will be ranked so that I get first for example 4096 samples of Ch1 and Ch2 4096 samples, etc. This means that I don't have to do it in parallel of the FFT and I would like to reuse the implementation of FFT and windowing to reduce the use of resources.

I intend using the VI Express followed by the Express VI of FFT window scaling

http://zone.NI.com/reference/en-XX/help/371599J-01/lvfpga/fpga_scaled_window/

http://zone.NI.com/reference/en-XX/help/371599J-01/lvfpga/fpga_fft/

and I'll use them inside a SCTL.

This figure comes from the section using the FFT and help illustrate the issue:

There is a discount to zero terminal for the fenestration and the FFT VI.

Are there internal registers in the windowing and FFT which force the image 1, image 2,... from the same signal or is it possible for the first entry in a framework of Ch1, the next frame belonging to Ch2, Ch3 gaze and so on and always get reliable results?

Another way to ask the same question: if I have to reset the window and FFT when changing the input signal?

Thank you

Anders

Hi Cyphish,

When using the FFT of the LabVIEW FPGA vi express and windows nationwide express vi calculations are make it point by point so there will be no problem when going through different types of measures. Therefore, you should have no problem with your application.

Best regards

Menelaos.K

Tags: NI Software

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