Filter Wavelet min/max frequencies

Dear Community,

I am analysing sound where the interesting things are in the ultraosund spectrum. I wanted to use wavelets to get some insights into the data.

However, 2/3 of the wavelet picture is focused on the uninteresting part (<10kHz), whereas the utrasound area gets a fraction of the attention.

Is there any chance I can specify, that the "music" is playing in certain frequency ranges? (e.g. above 40kHz or so)?

I use

cwt(x,fs);

to quickly display the wavelet.

Your answers are much appreciated!

Answer 1

[Roshni Garnayak]

You can use the Name-Value pair argument ‘FrequencyLimits’ to specify the range of frequencies you want to display. The value is specified as a two-element vector with positive strictly increasing entries.

You can use the following line of code where ‘minFreq’ and ‘maxFreq’ specifies the lower and upper limits of the frequency range:

cwt (x, fs, ‘FrequencyLimits’, [minFreq  maxFreq]); 

Please refer to the following link for more details on the usage of ‘FrequencyLimits’:

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

[Master1001]

Thanks a ton for the answer, makes life much easier ;)