Frequency-Domain Integration

Frequency-domain integration is used to separate and analyze the different frequency components which make up measured signals.

You can use the following strategies to obtain the spectrum of an integrated signal:

  • Perform the integration in the time domain before computing the spectrum.
  • Compute the spectrum before performing the integration in the frequency domain.

The following figure shows the results of integration in the time and frequency domains.

Figure 19. Power Spectrum Obtained Using Single Integration

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The power spectrum is computed after the time-domain integration filters settle. The frequency-domain integration scales the spectrum at each frequency line. No settling time is necessary for the frequency-domain integration because integration filters are not involved in the frequency-domain integration.

Perform frequency-domain integration in the following situations to maximize performance:

  • When the integrated signal is not needed in the time domain
  • When spectral measurements are performed