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Introduction to DSP

Time domain processing

Cross correlation to locate a signal

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

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.

Last updated: 10th December 1997 | http://www.bores.com/courses/intro/time/2_locate.htm

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