Voice frequency

A voice frequency (VF) or voice band is the range of audio frequencies used for the transmission of speech.

This article is about a technical treatment of the human voice. For voice categories derived from a European musical history, see vocal range. For a more general discussion of musical vocal ranges, see Voice classification in non-classical music.

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, allowing a sampling rate of 8 kHz to be used as the basis of the pulse code modulation system used for the digital PSTN. Per the Nyquist–Shannon sampling theorem, the sampling frequency (8 kHz) must be at least twice the highest component of the voice frequency via appropriate filtering prior to sampling at discrete times (4 kHz) for effective reconstruction of the voice signal.

Fundamental frequency

The voiced speech of a typical adult male will have a fundamental frequency from 85 to 180 Hz, and that of a typical adult female from 165 to 255 Hz.[1][2] Thus, the fundamental frequency of most speech falls below the bottom of the voice frequency band as defined above. However, enough of the harmonic series will be present for the missing fundamental to create the impression of hearing the fundamental tone.

gollark: Because you shouldn't. Those are different.
gollark: Do you mean octaplex?
gollark: Wait, evil base?
gollark: What if umwn is just visiting periodically to not lose his claims?
gollark: *Is* it good going to have stock after 100 days? Either you have really good automation systems, which would be good I guess, or your prices are too high so you're not selling.

See also

References
  1. Titze, I.R. (1994). Principles of Voice Production, Prentice Hall (currently published by NCVS.org) (pp. 188), ISBN 978-0-13-717893-3.
  2. Baken, R. J. (1987). Clinical Measurement of Speech and Voice. London: Taylor and Francis Ltd. (pp. 177), ISBN 1-5659-3869-0.

 This article incorporates public domain material from the General Services Administration document: "Federal Standard 1037C". (in support of MIL-STD-188)

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