How to determine the energy at different frequency bands of an acoustic signal?

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Kwaku Owusu 2021-2-3

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https://ww2.mathworks.cn/matlabcentral/answers/734477-how-to-determine-the-energy-at-different-frequency-bands-of-an-acoustic-signal

回答： Sindhu Karri 2021-2-5

Please, I have an acoustic signal and I have been able to convert it the frequency domain using FFT. Now I would like to determine the the energy of different frequency bands (A-weighting function) as a function of the energy of the entire frequency spectrum.

Please, I would like to know how this could be done in Matlab.

Thank you.

Kwaku

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Answer 1

Sindhu Karri 2021-2-5

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Hii,

You can use "weightingFilter" function to apply A-weighting filter to input singal and use "bandpower" function to caluclate power in a particular frequency interval.By dividing the power in a particualr frequency by total power gives us the percentage of total power.

Refer to below link for more information:

https://www.mathworks.com/help/audio/ref/weightingfilter-system-object.html

https://www.mathworks.com/help/signal/ref/bandpower.html