Z Transform and Correlation II.

Cuthbert Nyack
The applet below shows autocorrelation(correlation of a sequence with itself) being used to "clean up" a signal with noise.

Magenta and yellow show a sinusoid and a sinusoid with noise. The autocorrelation of the magenta sequence is in pink and that of the yellow sequence is in cyan. The difference between the autocorrelations is much less than the difference between the signals.

The spectra of the noisy signal and its autocorrelation is also shown.

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COPYRIGHT 2008 Cuthbert Nyack.