Power spectrum of audio signal

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Quant.Phys42
Quant.Phys42 2019-12-7
回答： Roshni Garnayak 2019-12-11
If i have an audio file, an .m4a file for example, how do i plot the power spectrum of such a signal (without redundant data) with the frequency axis in Hz given that the audio signal is sampled at 40000 Hz?

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Roshni Garnayak
Roshni Garnayak 2019-12-11
To import the audio file into MATLAB workspace, use the ‘audioread’ function. Refer to the link below to get the details of ‘audioread’ function:
https://www.mathworks.com/help/matlab/ref/audioread.html
To obtain the power spectrum of the audio signal, refer to the following links:
https://www.mathworks.com/help/matlab/math/basic-spectral-analysis.html
https://www.mathworks.com/help/signal/ref/dspdata.psd.html
The first link gives examples of power spectrum computation for audio signals. The second link is about the ‘dspdata.psd’ function which computes the power spectral density.

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