Technology
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https://www.ico-optics.org/what-hz-is-human-voice/
https://www.voicescience.org/2025/05/lexicon/average-speaking-frequencies/
http://www.1st-acoustics.com/knowledge/frequency-range-for-human-voice.html
In these sources they are talking about the fundamental frequency of human Speech F~0~. Which is one important indicator but I don't think this band is sufficient for comprehension. Record yourself, apply a low-pass filter with cut frequently at 300Hz and check for yourself if this is enough to understand. It might be enough to make out some words, but I doubt it's enough to hear clearly.
Maybe machine learning can infer the missing wave information (like Fourier transforming partial waveforms??