How to characterize this whitening filter?

1. What is whitening filter?
2. What is whitening of a signal?
3. What is spectral whitening?
4. Why do we whiten signals?

What is whitening filter?

By definition, is a whitening filter if the components of are second-order decorrelated (or white) both in time and space. This means in the time domain: (8.17) Such a filter is not unique (consider the left multiplication of by any unitary matrix).

What is whitening of a signal?

The whitening process is often used for ambient vibration data before stacking waveforms for cross-correlation. The process is simple as Fourier transforming the signal after applying Hann window, then normalizing its magnitude, and then inverse Fourier transforming it.

What is spectral whitening?

Spectral Whitening (sometimes called balencing or broadening) is a process usually applied post-migration to improve the resolution and appearance of seismic data and is a crude attempt to correct for frequency attenuation.

Why do we whiten signals?

Whitening and de-emphasis enhance the quality of the speech signal. This module is especially useful if constant "whistling" is present in the recording. The algorithm starts with finding the part of the recording that contains only noise and no speech signal.