Signal matching How to quantify the difference between two signals of varying frequency

1. How do you find the difference between two signals?
2. How do you quantify similarity between two signals?
3. How do you know if two signals are correlated?
4. Which is used to compare two signals?

How do you find the difference between two signals?

function [ diff ] = FindDiff( signal1, signal2 ) %FINDDIFF Finds the difference between two signals of equal frequency %after an appropritate time shift is applied % Calculates the time shift between two signals of equal frequency % using cross correlation, shifts the second signal and subtracts the % shifted signal ...

How do you quantify 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.

How do you know if two signals are correlated?

In words, we compute a correlation by multiplying two signals together and then summing the product. The result is a single number that indicates the similarity between the signals x[n] and y[n]. What values can C(x, y) take on, and what does this tell us about the signals x[n] and y[n]?

Which is used to compare two signals?

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