How do I get the time-frequency plot from given signal and DWT?

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Georgina Gocza 2020-5-24

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评论： Rasula Dias 2021-4-16

在 MATLAB Online 中打开

I have a given signal. I know that I want to transform it with a Haar wavelet, and so I used wavedec to do just that:

[c,dcoeff] = wavedec(voltages,5,'haar')

This gives me back the coefficients. I also got the detail coefficient vectors:

[cd1,cd2,cd3,cd4,cd5]=detcoef(c,dcoeff,[1,2,3,4,5])

I want to plot this in the time-frequency domain to get an image much like this:

...but I have no idea how to do that just from the data above. Could anyone please share a time-frequency-amplitude plot code for wavelet transformed signals?

Thank you!

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Georgina Gocza 2020-8-6

BTW in the meantime I figured it out and the week I get my diploma, I'll upload the answer

Cheers peeps!

Rasula Dias 2021-4-16

Would be very grateful for the answer or to a link of it. I have the same question. Want to apply the DWT to an audio signal and visualize it.

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Answer 1

Sai Sri Pathuri 2020-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/532198-how-do-i-get-the-time-frequency-plot-from-given-signal-and-dwt#answer_439718

You may refer the following answer

https://www.mathworks.com/matlabcentral/answers/79332-how-can-i-get-a-time-frequency-representation-of-the-resulted-details-and-approximation-signals-from?s_tid=answers_rc1-2_p2_MLT

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How do I get the time-frequency plot from given signal and DWT?

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How do I get the time-frequency plot from given signal and DWT?

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