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Cell Phone Frequencies / Wireless Communications Devices
https://service.shure.com/s/article/cell-phone-frequencies-wireless-communications-devices?language=en_US#:~:text=In%20the%20United%20States%2C%20there%20are%20the%20four,MHz%20%28PCS%20Band%29%204%201710%E2%80%931755%2F2110%E2%80%932155%20MHz%20%28AWS%20Band%29
What is the frequency response of the North American ...
https://hubtechinsider.wordpress.com/2009/06/03/what-is-the-frequency-response-of-the-north-american-public-switched-telephone-network/
The conventional North American Public Switched Telephone Network, or PSTN, has a frequency response range of 300 Hz to 3,400 Hz. The normal hearing range of humans is typically 30 Hz to 20,000 Hz. So the conventional telephone transmission system is unable to carry bright, high-frequency and deep, low-frequency tones.
What is AF (audio frequency or a.f.)? - Definition from ...
https://whatis.techtarget.com/definition/AF-audio-frequency-or-af
The AF range is generally considered to be from 20 Hz to 20,000 Hz. All telephone circuits operate with AF signals in a restricted range of approximately 200 Hz to 3000 Hz.
4pAAa12 – Hearing voices in the high ... - Acoustics.org
https://acoustics.org/hearing-voices-in-the-high-frequencies-what-your-cell-phone-isnt-telling-you-brian-b-monson/
You might already know that the reason is because a cell phone doesn’t transmit all of the sounds that the human voice creates. Specifically, cell phones don’t transmit very low-frequency sounds (below about 300 Hz) or high-frequency sounds (above about 3,400 Hz). The voice can and typically does make sounds at very high frequencies in the “treble” audio range (from about …
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