Window Function

This node multiplies the input rows with a window function to prevent spectral leakage in subsequent FFT. You might want to use this node together with the Fast Fourier Transform (FFT) Node.

This node is part of the DSP Extensions provided by AI.Associates GmbH, Germany. For more information please refer to https://ai.associates/knime or write an email to knime@ai.associates.

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Window Function

Choose the appropriate window function for your signal - in case of doubt choose the Hann function.

• Hann: useful for combinations of sine-waves and unknown content
  
• Hamming: useful for closely spaced sine-waves
  
• Flat-Top: useful for sine-waves if amplitude accuracy is important
  
• Blackman: good general-purpose window
  
  

For a good intuitive explanation of window function see for instance:
http://www.ni.com/white-paper/4844/en/

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