How can I get the energy of a wave?

I used signal analyzer to analyze a wave of the sound.

Now I would like to calculate the energy of the sound.

My idea is to firstly squared the amplitude and then integrated the whole wave.

I have squared the amplitude and got the diagram of squared amplitude v.s. time.

However, I don't know how to integrate this wave without having a wavefunction.

How could I do? Thank you.

[Li-Wun]

Now I found that I could use the code below to get my result:

data_squared = data.^2

S = sum(data)

Is there any other consideration?

Thank you.

[Paul]

Yes, that's the standard definition of the energy in the discrete-time signal as long as the elements of data are real and it's assumed that the signal is zero for indices outside those covered by data.

[Li-Wun]

Thank you so much.

Answer 1

[Paul]

Hi Li-Wun,

This answer may be what's needed. If not, feel free to post back here with follow-up questions, preferably with example code.

[Li-Wun]

Thank you so much.