Similarity of two signals

1. How do you find the similarity between two signals?
2. Is the measure of similarity between two different signals?
3. What is correlation between two signals?
4. How do you find the similarity between two signals in Python?

How do you find the similarity between two signals?

Similarity in energy (or power if different lengths): Square the two signals and sum each (and divide by signal length for power). (Since the signals were detrended, this should be signal variance.) Then subtract and take absolute value for a measure of signal variance similarity.

Is the measure of similarity between two different signals?

Cross-correlation is a measure of similarity between two signals.

What is correlation between two signals?

Correlation of two signals is the convolution between one signal with the functional inverse version of the other signal. The resultant signal is called the cross-correlation of the two input signals. The amplitude of cross-correlation signal is a measure of how much the received signal resembles the target signal.

How do you find the similarity between two signals in Python?

For measuring the similarity between two temporal signals, you can try using Dynamic Time Warping (DTW). DTW constructs a distance matrix between the two signals and tries to find minimum distance the two signals. If the two signals are identical, then distance is zero.