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I have created a little classifier that listens for certain keywords. Sometimes it will not react to a keyword, but if I shout the word, then the classifier will be able to pick it up.

The classifier uses MFCC as features, which is basically a Short-time Fourier Transform with some extra stuff. This tells me that when I shout, the frequencies that the classifier are detecting are actually different from the non-shout.

So I'm wondering: does the volume of my shout change the frequencies in my speech, or am I somehow enunciating differently when I shout?

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  • $\begingroup$ Could also be a signal to noise ratio problem. Getting a clean microphone pickup is difficult and speaking louder does help with that too $\endgroup$ – Hilmar Oct 15 '20 at 12:20
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In a nutshell: yes, it does, at least under certain circumstances.

In a noisy environment, people tend to not only increase their volume when speaking, but also speak in a higher pitch. It's called Lombard Effect, it's well known and you should find plenty of material about it.

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