Denoise Noisy Doppler Signal
Use Signal Analyzer to denoise the noisy Doppler signal and display its scalogram. This example requires a Wavelet Toolbox™ license.
Load the noisy Doppler signal.
Open Signal Analyzer and drag the signal from the Workspace Browser to the Signal table. Duplicate the signal. Rename the duplicate
noisdoppDenoise. Click Display Grid to create a one-by-two grid of displays. Plot
noisdopp in the left display and
noisdoppDenoise in the right display.
Select the right display and highlight the name
noisdoppDenoise in the Signal table. Select the Analyzer tab, click Preprocess to enter the preprocessing mode, and choose
Denoise from the list of preprocessing options.
Use the Function Parameters panel to adjust and apply denoising parameters to the selected signal. For more information, see Wavelet Signal Denoiser (Wavelet Toolbox). Click the Apply button to denoise the signal with the default settings. Click Accept All to save the preprocessing results and exit the mode. The denoised signal is smoother than the original signal.
To denoise the signal with a different set of parameters, click Undo Preprocessing, reenter the preprocessing mode, and select
Denoise. In the Function Parameters panel, select
Universal Threshold from the Denoising Method dropdown list and
Hard from the Thresholding dropdown list. Click Apply and exit the mode.
To see the effects of denoising on the scalogram, click Time-Frequency on the Display tab and select
Scalogram. Click on the left display and repeat the steps.
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