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Find energy for each second of audio file

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Giggs B.
Giggs B. on 25 Jul 2021
Commented: Star Strider on 26 Jul 2021
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

Accepted Answer

Star Strider
Star Strider on 25 Jul 2021
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
.
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