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

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Khaled Abojlala
Khaled Abojlala 2016-9-15
评论： Walter Roberson 2016-9-15
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

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回答（1 个）

Walter Roberson
Walter Roberson 2016-9-15
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.
  2 个评论
Walter Roberson
Walter Roberson 2016-9-15
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

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