{|class="wikitable floatright"
|+Audio bands in telephony
! Name !! Range (Hz)
|-
| Narrowband || 300–3,400
|-
| Wideband || 50–7,000
|-
| Superwideband || 50–14,000
|-
| Fullband || 20–20,000
|}
A voice frequency (VF) or voice band is the range of audio frequencies used for the transmission of speech.
Frequency band
In telephony, the usable voice frequency band ranges from approximately 300 to 3400 Hz. 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, Thus, the fundamental frequency of most speech falls below the bottom of the voice frequency band as defined. However, enough of the harmonic series will be present for the missing fundamental to create the impression of hearing the fundamental tone.
Wavelength
The speed of sound at room temperature (20°C) is 343.15 m/s. Using the formula
:<math>\text{Wavelength} = \frac{\text{Speed{\text{Frequency,</math>
we have:
Typical female voices range from to .
Typical male voices range from to .
See also
- Formant
- Hearing (sense)
- Voice call