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Wideband audio - Wikipedia
https://en.wikipedia.org/wiki/Wideband_audio#:~:text=The%20range%20of%20the%20human%20voice%20extends%20from,frequency%20range%20of%2050%20Hz%20to%207%20kHz.
Bandwidth - Telecom ABC
http://telecomabc.com/b/bandwidth.html
The bandwidth is measured in terms of Hertz (Hz). The bandwidth of a signal depends on the amount of information contained in it and the quality of it. The range of frequencies necessary for an analogue voice signal, with a fixed telephone line quality (recognizable speaker), is 300 - 3400 Hz. This means that the bandwidth of the signal is 3,100 Hz.
sampling - Why is telephone audio sampled at 8 kHz ...
https://dsp.stackexchange.com/questions/22107/why-is-telephone-audio-sampled-at-8-khz
It was thought to provide a good trade-off between quality and bandwidth. Actually a single voice signal occupies 8 kHz, not 8 kbps, of bandwidth. Each sample is quantized into 8 bits, yielding a rate of 64 kbps which is used universally. Further reading: http://en.wikipedia.org/wiki/Digital_Signal_0.
What Are VoIP Codecs? [Bandwidth & Comparisons] | G12 ...
https://www.g12com.com/voip-codecs/
The quality that you find in a typical phone call includes two bands: narrowband and wideband. With a narrowband, it covers frequencies from 300 Hz to 3400 Hz. Any audio between 50 Hz and 7000 Hz is considered wideband. When you talk in those ranges for wideband, that is commonly referred to as HD voice.
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