What is Coherence? How to calculate Coherence in ASI Datalab?


Coherence represents that the response is related to excitation/reference signal. Two signals (Response and excitation/reference) is considered as coherent if it has constant phase difference and same frequencies.
Values for coherence will be between 0 and 1, where 0 indicates there is no relationship between the two signals and 1 indicates there is a perfect relationship between the two signals.
It uses Welch’s modified periodogram method for computation. It requires two inputs, first being the response signal and second being the excitation/reference signal. The output is a function of frequency (Hz).

To calculate coherence in ASI datalab following parameters are required as input:

  • Required Frequency Spacing (Hz)
  • Data Window (Default: Hann)
    • Available Window Options
      •  Parzen
      • Bartlett
      • Hanning
      • Hamming
      • Kaiser
      • Flat Top
      • Blackman-Harris
  • Percentage Overlap (Default: 75%)
    • Available: 0%, 25%, 50% and 75%
  • Use nearest spacing (Default: No)

Try it on ASI Datalab Now

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