[Question:] How to capture intensity or perceived loudness of a given audio file at regular intervals

[StanSilas]

If you are playing a song on your laptop, As you increase the volume from 0 to 100, the audio becomes louder and louder.

Say I have an .mp3 or .wav , how do I capture this ^ perceived loudness/intensity at regular intervals (may be 0.1 second) in the audio using python speech features?

Any advice is appreciated.

Thanks
Vivek

[morenoh149]

the amplitude of the waveform is the loudness. So to measure the loudness every 0.1 seconds you get the amplitude at that point in time. Maybe you want something else?

this project uses scipy and that returns a numpy array (https://docs.scipy.org/doc/scipy/reference/generated/scipy.io.wavfile.read.html#scipy.io.wavfile.read) so you'd just seek in that np array to the time you're interested in and return the value at that time.

[venkatsubash2003]

Do you mean that Loudness is nothing but Amplitude per second?

[jameslyons]

Loudness is a perceptual quality of audio related nonlinearly to the audio waveform. You can approximate it quite well by squaring the time domain waveform, summing the result and taking the logarithm (cube root can also work here). If you are interested in rough perceptual loudness per second, that will do if you sum over 1 second segments of your audio.

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