• Use Slider to get Desired Frequenies and Amplitudes:
  
  
  
      
  F1 Hz

  
      
  Amp 1

  
      
  F2 Hz

  
      
  Amp 2

• Set Window Type, Sampling Frequency & #Lines:
  
  
  Window Type: No Window Hann Bartlett Blackman-Harris Flat Top Hamming

  Fmax: 
  Hz

  #Lines:  400 Lines 25 Lines 50 Lines 100 Lines 200 Lines 800 Lines 1600 Lines 3200 Lines

  Resolution: 
   Hz

Explanation:

In this simulator, the user can generate single or dual frequency signals. In the event that a specific frequency is not bin-centered, leakage of energy to adjacent bins occurs; a result of processing finite-duration records. Windows are weighing functions applied to data to reduce the spectral leakage associated with finite observation intervals. There are several types of windows available in this simulator including: Hann (Hanning / Raised Cosine), Bartlett, 4-term Blackman-Harris, Flat-Top, and Hamming windows.

The spectral content is amplitude corrected with the appropriate window Amplitude Correction Factor.

Fmax is calculated based on FS, # of Lines based on # Samples. Thus, Resolution (LRF) is calculated from FS and # Samples.

Important Note: # Samples must be power of 2. The Fast Fourier Transform requires that the number of samples always be a power of 2: i.e. 64, 128, 256, 512, 1024 etc, resulting in # of Lines of: 25 50 100 200 400, respectively.

Disclaimer:

• RITEC - Interactive - FFT, Windows and Leakage Simulation is a free demonstration tool provided by RITEC. All efforts are made to ensure accurate results. RITEC is not in any way liable for accuracy of provided results.
• No reproduction of this page, without explicit written consent from RITEC, is authorized. Violations will be construed as infringement of RITEC property.

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