Find energy for each second of audio file

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Giggs B. 2021-7-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/885654-find-energy-for-each-second-of-audio-file

评论： Star Strider 2021-7-26

Hi,

I have an audio signal which has 44.1 KHz sampling rate, which would be stored as an array. I am trying to find energy for each second using:

sum(x.^2);

Can someone help me how to do that? Thanks

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Answer 1

Star Strider 2021-7-25

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https://ww2.mathworks.cn/matlabcentral/answers/885654-find-energy-for-each-second-of-audio-file#answer_753604

Use the buffer function:

Fs = 44.1E+3;                               % Sampling Frequency
s = randn(Fs*5.2,1);                        % Signal
seconds_sampled = 1;                        % Desired Smaple Length
sec1 = Fs*seconds_sampled;                  % Corresponding Samples
s_sections = buffer(s,sec1)
s_sections = 44100×6
    1.5751    1.0628    0.3946    0.6711   -0.3298   -2.0274
    1.5076    1.0714    0.6997   -1.6182   -0.7092    0.3166
   -0.9737    0.2084    0.1273   -0.9344    0.6038   -0.0711
    0.2128    0.7510    0.3992   -0.5763   -0.0085   -0.7977
   -0.8026    1.5172   -0.1044    0.7109    0.4487    1.7293
    0.1842   -0.8955    0.0778   -0.2759   -0.5885    1.3357
   -0.7606    0.9031   -0.5579   -0.3093   -1.3640    0.1967
    0.1805    1.6719   -0.8658    1.0763    0.9120    0.9080
    0.0411   -0.1559   -0.9230   -1.8707   -0.3266   -1.5487
   -1.1568    0.2762    0.5586   -0.8734    0.1023    1.6655
Check = size(s_sections)
Check = 1×2
       44100           6
Energy = sum(s_sections.^2)
Energy = 1×6
	1.0e+04 *

    4.4284    4.3893    4.4579    4.4808    4.4129    0.9051