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Math Help - noise level comparison in Matlab

  1. #1
    Member disclaimer's Avatar
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    noise level comparison in Matlab

    Hello;

    Is there a good way to compare noise levels between noisy and de-noised 1-D signals in Matlab? Something that would actually show a visible difference... The noise I used was generated by rand. Fast Fourier Transform...? Power Spectral Density? I'm not sure where to start. I'm cleaning signals with wavelets and I want some proof to show that the noise level has been reduced other than just looking at the de-noised signal. Suggestions will be greatly appreciated. Thanks.
    Last edited by disclaimer; January 22nd 2011 at 11:17 AM.
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by disclaimer View Post
    Hello;

    Is there a good way to compare noise levels between noisy and de-noised 1-D signals in Matlab? Something that would actually show a visible difference... The noise I used was generated by rand. Fast Fourier Transform...? Power Spectral Density? I'm not sure where to start. I'm cleaning signals with wavelets and I want some proof to show that the noise level has been reduced other than just looking at the de-noised signal. Suggestions will be greatly appreciated. Thanks.
    PSD would be a good start.

    If you know the signal you started with, comparison of de-noised signal with the ground truth signal in both time and frequency domain might be nice.


    CB
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