In telephony, the usable voice frequency band ranges from approximately 300 to 3400 Hz.
[2] It is for this reason that the ultra low frequency band of the electromagnetic spectrum between 300 and 3000 Hz is also referred to as voice frequency, being the electromagnetic energy that represents acoustic energy at baseband.
The bandwidth allocated for a single voice-frequency transmission channel is usually 4 kHz, including guard bands,[2] allowing a sampling rate of 8 kHz to be used as the basis of the pulse-code modulation system used for the digital PSTN.
The voiced speech of a typical adult male will have a fundamental frequency from 90 to 155 Hz, and that of a typical adult female from 165 to 255 Hz.
This article incorporates public domain material from Federal Standard 1037C.