Power spectrum of audio signal

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?

[Walter Roberson]

https://www.mathworks.com/matlabcentral/answers/345467-hi-how-can-i-plot-power-spectrum-from-a-time-series-data#answer_271285

Answer 1

[Roshni Garnayak]

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.