Removing noise along and within range Frequency

Hallo everyone,

I've read about how to denoise a signal which has noise within frequency spectrum in Mathworks in this link below.

https://de.mathworks.com/matlabcentral/answers/321316-removing-noise-from-accelerometer-data

I think the advices about using "cmddenoise" might be really helpful for me, since i've the same problem right now(denoise noise within frequency signal). So far i know, i have to create my own Wavelet Name according to my signal, since each signal has different characteristic, am i right? But does everyone know or has experiences how to define the wname? Since it'd really helpful for my project.

Thanks before.

Answer 1

[Arnav Mendiratta]

The 'wname' is the name of wavelet from the Wavelet Toolbox. http://www.mathworks.com/help/wavelet/ref/cmddenoise.html#inputarg_wname

Based on your application, you can use the available wavelets in the Toolbox. These are all the wavelets that come with the toolbox:

https://www.mathworks.com/help/wavelet/ref/waveletfamilies.html

If you don't know which specific wavelet to use, you can test your application using the wavelet app. https://www.mathworks.com/help/wavelet/gs/introduction-to-the-wavelet-families.html

There is a functionality to add your own wavelets to the toolbox. If you want to use your own wavelet families with the Wavelet Toolbox™ software, do the following:

1. Create a new directory specifically to hold the wavelet extension files.

2. Move the previously mentioned files into this new directory.

3. Prepend this directory to the MATLAB® directory search path (see the reference entry for the path command).

4. Use this same directory for subsequent modifications. Allowing many wavelet extension files to proliferate in different directories may lead to unpredictable results.

5. Define an MATLAB file called <fsn>info.m (for example, see dbinfo.m or morlinfo.m), which will be associated automatically with the Wavelet Family button in the Wavelet Display option of the graphical tools.

Here is a comprehensive discussion of creating user defined wavelets: https://www.mathworks.com/matlabcentral/answers/75397-adding-custom-wavelets-to-cwt

[Big dream]

thanks very much. Your explanation helps.