File Exchange

image thumbnail

SPECTRAL WHITENING

version 1.0 (86.1 KB) by

This function applies whitening to a given signal within user defined frequency band.

8 Downloads

Updated

View License

FREQUENCY DOMAIN WHITENING OF DISCRETE TIME SIGNAL
This function generates flat Fourier spectrum for a given signal (which is originally not white) either for the full range of 0 Hz to the Nyquist frequency or for a user defined frequency band. This operation tends to sharpen signal, as well as the noise. 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.

Syntax:
xnew = whitening(x, Fs, freq, []) for the full range of 0 Hz to the Nyquist frequency
xnew = whitening(x, Fs, freq, [0.1, 20]) for 0.1 Hz to 20 Hz as an example

Input:
x = input signal (x must be a row vector)
Fs = sampling rate (e.g., 200)
freq = frequency limit for whitening in Hz (e.g., freq, [ ] or freq, [0.1, 20])

Output:
xnew = spectrally whitened signal for the full range of 0 Hz to the
Nyquist frequency or within a user defined frequency band

Example: See demo.m file

Comments and Ratings (0)

Updates

1.0

Updated notes

1.0

updated description

MATLAB Release
MATLAB 9.3 (R2017b)

MATLAB Online Live Editor Challenge

Win cash prizes and have your live script featured on our website

Learn more

Download apps, toolboxes, and other File Exchange content using Add-On Explorer in MATLAB.

» Watch video