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Introduction to DSP - time domain processing: cross correlation I

Cross correlation (correlating a signal with another) can be used to detect and locate known reference signal in noise.

cross correlation to identify an object

The diagram shows how the signal can be located within the noise.

  • A copy of the known reference signal is correlated with the unknown signal.
  • The correlation will be high when the reference is similar to the unknown signal.
  • A large value for correlation shows the degree of confidence that the reference signal is detected.
  • The large value of the correlation indicates when the reference signal occurs.

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