How Can I use FFT to extract dq component of specific frequency from distorted signal?

I am trying to extract a signal with specific frequency from distorted signal using FFT, but I couldn't find the frequency option in simulink 2016.

any ideas

Answer 1

[Walter Roberson]

The result of the fft will be a vector. Index into the vector. See https://www.mathworks.com/matlabcentral/answers/33009-simulink-block-to-extract-signal-at-index-from-vector-signal-doesn-t-exist for information on indexing.

You would need to calculate the index to use, in the standard ways based on Fs and number of points to determine the bin width.

[Khaled Abojlala]

Thanks but How can I extract the required frequency from this output?

[Walter Roberson]

frequency resolution is number of points divided by Fs divided by 2. Bin index is 1 + floor(target frequency divided by frequency resolution) . You can do those mathematical calculations using Math blocks