Does this make sense for cross-correlation in frequency domain?

1. What is cross-correlation in frequency domain?
2. Does cross-correlation use FFT?
3. What does cross-correlation tell you?
4. Why do we use correlation for signals?

What is cross-correlation in frequency domain?

According to the cross-correlation theorem : the cross-correlation between two signals is equal to the product of fourier transform of one signal multiplied by complex conjugate of fourier transform of another signal.

Does cross-correlation use FFT?

The calculation of the cross-correlation function using FFT is a well-known method for measuring correlation and time delay or shift between 1D and 2D signals in fields such as audio and image analysis.

What does cross-correlation tell you?

Cross-correlation is a measurement that tracks the movements of two or more sets of time series data relative to one another. It is used to compare multiple time series and objectively determine how well they match up with each other and, in particular, at what point the best match occurs.

Why do we use correlation for signals?

What does correlation mean in signal processing? The concept of correlation in general quantifies the similarity of two spatial- or time-dependent signals x and y . The main property of correlation is that both signals do not have to depend on each other; only statements regarding their similarity can be given.