digplanet beta 1: Athena
Share digplanet:


Applied sciences






















Spectrogram of American English vowels [i, u, ɑ] showing the formants f1 and f2

Formants are defined by Gunnar Fant[1] as "the spectral peaks of the sound spectrum of the voice". In speech science and phonetics, formant is also used to mean an acoustic resonance[2] of the human vocal tract. It is often measured as an amplitude peak in the frequency spectrum of the sound, using a spectrogram (in the figure) or a spectrum analyzer, though in vowels spoken with a high fundamental frequency, as in a female or child voice, the frequency of the resonance may lie between the widely-spread harmonics and hence no peak is visible.

In acoustics, it refers to a peak in the sound envelope and/or to a resonance in sound sources, notably musical instruments, as well as that of sound chambers. Any room can be said to have a formant unique to that particular room, due to the way sound may bounce differently across its walls and objects. Room formants of this nature reinforce themselves by emphasizing specific frequencies and absorbing others, as exploited, for example, by Alvin Lucier in his piece I Am Sitting in a Room.

Formants and phonetics[edit]

Formants are the distinguishing or meaningful frequency components of human articulation and of singing. By definition, the information that humans require to distinguish between vowels can be represented purely quantitatively by the frequency content of the vowel sounds. In speech, these are the characteristic overtones that identify vowels to the listener. Most of these formants are produced by tube and chamber resonance, but a few whistle tones derive from periodic collapse of Venturi effect low-pressure zones. The formant with the lowest frequency is called f1, the second f2, and the third f3. Most often the two first formants, f1 and f2, are enough to disambiguate the vowel. The relationship between the perceived vowel quality and the first two formant frequencies can be appreciated by listening to "artificial vowels" that are generated by passing a click train (to simulate the glottal pulse train) through a pair of bandpass filters (to simulate vocal tract resonances). An interactive demonstration of this can be found here. The first two formants determine the quality of vowels in terms of the open/close and front/back dimensions (which have traditionally, though not entirely accurately, been associated with the position of the tongue). Thus the first formant f1 has a higher frequency for an open vowel (such as [a]) and a lower frequency for a close vowel (such as [i] or [u]); and the second formant f2 has a higher frequency for a front vowel (such as [i]) and a lower frequency for a back vowel (such as [u]).[3][4] Vowels will almost always have four or more distinguishable formants; sometimes there are more than six. However, the first two formants are most important in determining vowel quality, and this is often displayed in terms of a plot of the first formant against the second formant,[5] though this is not sufficient to capture some aspects of vowel quality, such as rounding.[6]

Nasals usually have an additional formant around 2500 Hz. The liquid [l] usually has an extra formant at 1500 Hz, while the English "r" sound ([ɹ]) is distinguished by virtue of a very low third formant (well below 2000 Hz).

Plosives (and, to some degree, fricatives) modify the placement of formants in the surrounding vowels. Bilabial sounds (such as /b/ and /p/ in "ball" or "sap") cause a lowering of the formants; velar sounds (/k/ and /ɡ/ in English) almost always show f2 and f3 coming together in a 'velar pinch' before the velar and separating from the same 'pinch' as the velar is released; alveolar sounds (English /t/ and /d/) cause less systematic changes in neighbouring vowel formants, depending partially on exactly which vowel is present. The time-course of these changes in vowel formant frequencies are referred to as 'formant transitions'.

If the fundamental frequency of the underlying vibration is higher than a resonance frequency of the system, then the formant usually imparted by that resonance will be mostly lost. This is most apparent in the example of soprano opera singers, who sing high enough that their vowels become very hard to distinguish.

Control of resonances is an essential component of the vocal technique known as overtone singing, in which the performer sings a low fundamental tone, and creates sharp resonances to select upper harmonics, giving the impression of several tones being sung at once.

Spectrograms are used to visualise formants.

Average vowel formants[7]
Vowel (IPA) Formant f1 Formant f2
i 240 Hz 2400 Hz
y 235 Hz 2100 Hz
e 390 Hz 2300 Hz
ø 370 Hz 1900 Hz
ɛ 610 Hz 1900 Hz
œ 585 Hz 1710 Hz
a 850 Hz 1610 Hz
æ 820 Hz 1530 Hz
ɑ 750 Hz 940 Hz
ɒ 700 Hz 760 Hz
ʌ 600 Hz 1170 Hz
ɔ 500 Hz 700 Hz
ɤ 460 Hz 1310 Hz
o 360 Hz 640 Hz
ɯ 300 Hz 1390 Hz
u 250 Hz 595 Hz

Singer's formant[edit]

Studies of the frequency spectrum of trained singers, especially male singers, indicate a clear formant around 3000 Hz (between 2800 and 3400 Hz) that is absent in speech or in the spectra of untrained singers. It is thought to be associated with one or more of the higher resonances of the vocal tract.[8] It is this increase in energy at 3000 Hz which allows singers to be heard and understood over an orchestra, which peak at much lower frequencies of around 500 Hz. This formant is actively developed through vocal training, for instance through so-called voce di strega (IPA: [ˈvoːtʃe di ˈstrɛːɡa]) or "witch's voice"[9] exercises and is caused by a part of the vocal tract acting as a resonator.[10][11]

See also[edit]


  1. ^ Fant, G. (1960). Acoustic Theory of Speech Production. Mouton & Co, The Hague, Netherlands.
  2. ^ Titze, I.R. (1994). Principles of Voice Production, Prentice Hall, ISBN 978-0-13-717893-3.
  3. ^ Ladefoged, Peter (2006) A Course in Phonetics (Fifth Edition), Boston, MA: Thomson Wadsworth, p. 188. ISBN 1-4130-2079-8
  4. ^ Ladefoged, Peter (2001) Vowels and Consonants: An Introduction to the Sounds of Language, Maldern, MA: Blackwell, p. 40. ISBN 0-631-21412-7
  5. ^ Deterding, David (1997) 'The Formants of Monophthong Vowels in Standard Southern British English Pronunciation', Journal of the International Phonetic Association, 27, pp. 47-55.
  6. ^ Hayward, Katrina (2000) Experimental Phonetics, Harlow, UK: Pearson, p. 149. ISBN 0-582-29137-2
  7. ^ Catford, J.C. (1988) A Practical Introduction to Phonetics, Oxford University Press, p. 161. ISBN 978-0198242178
  8. ^ Sundberg, J. (1974) “Articulatory interpretation of the ‘singing formant’,” Journal of the Acoustical Society of America, 55, 838-844.
  9. ^ Frisell, Anthony (2007). Baritone Voice. Boston: Branden Books. p. 84. ISBN 0-8283-2181-7. 
  10. ^ "Vocal Ring, or The Singer's Formant". The National Center for Voice and Speech. Retrieved 2008-04-07. 
  11. ^ Sundberg, Johan (1987). The science of the singing voice. DeKalb, Ill: Northern Illinois University Press. ISBN 0-87580-542-6. 

External links[edit]

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Formant — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.
21011 videos foundNext > 

Team Sleep - Formant

Team Sleep's greatest song so far.

Minilecture Bioacoustics 101-Formant Frequencies

Prof. Tecumseh Fitch explains formant frequencies in this Minilecture.

Minilecture Bioacoustics 101 - Where do formants come from ?

Prof. Tecumseh Fitch explains where formants come from.


A short tutorial on formants or formant regions.

Monster Formant Modular

This is the mega big DIY Formant Mudular Synthesizer of my friend Siegfried Brückner from Duesseldorf/Germany. Many Modules are prepatched on the rear into 3...

Kemper Profiler Formant Shift Demo

Bill Ruppert demonstrates the new Formant shift function in the Kemper Profiler.

Strymon Mobius - Formant Machine audio demo

For more on Strymon Mobius, please visit http://strymon.net/mobius Mobius gives you twelve legendary, versatile, and inspirational modulation machines, all i...

Formant Musik-Synthesizer #1 Demo-Tape 1978 (German)

For educational purpose only! Das vorliegende Demonstrationsband war Teil des vom Fachverlag Elektor herausgegebenen Buches „Formant Musik-Synthesizer" (1978...

Siggi's Super Formant Synthesizer - Sound Monster

For more information please write to: mail@brueckner-av.de Siggi's Super Formant Synthesizer ist der weltweit einzige und grösste Formant Synthesizer mit ein...

Praat formant measurement

This is a series of short tutorials for researchers and students who just started working with PRAAT (http://www.fon.hum.uva.nl/praat/), a program for carryi...

21011 videos foundNext > 

2094 news items

Tue, 02 Sep 2014 03:07:30 -0700

He accommodates people in a pathological formant, even when the subject being discussed by his guest is not relevant to his thought. This quality of the man is more of inheritance. It is in his blood because the typical Izon man has an enduring "with ...
Sun, 31 Aug 2014 19:25:53 -0700

However, Sun Pharma and Ranbaxy received notice from Competition Commission of India (CCI) to make public details of their proposed merger transaction in a “prescribed formant” within 10 working days. This put pressure on share price of Sun and ...

Les Échos

Les Échos
Tue, 02 Sep 2014 00:41:15 -0700

En 1944 l'école Camondo est venue renforcer ce vivier de création, formant des architectes d'intérieur et des designers. Pendant plusieurs années l'institution a organisé le Salon des artistes qui a fait connaître Eileen Gray, Jacques-Emile Ruhlmann ...

Les Échos

Les Échos
Tue, 02 Sep 2014 02:00:00 -0700

Chercher à faire monter en compétences une personne un peu faible en la parrainant ou en la formant est une belle opportunité envisageable, si toutefois l'intéressé(e) dispose d'aptitudes lui permettant réellement d'évoluer. Chercher à lui offrir une ...
News Press (Communiqué de presse)
Tue, 02 Sep 2014 06:07:30 -0700

Il s'agit d'une gravure abstraite formant un croisillon, profondément incisée dans le sol d'une plateforme rocheuse située au fond de la grotte. Elle était couverte, au moment de son identification, par une couche de sédiments datés au Carbone 14 à 39 ...
Gazette des communes
Mon, 01 Sep 2014 22:37:30 -0700

L'Etat œuvre de manière très concrète afin de développer les usages en accompagnant les collectivités qui se lancent et en formant les agents territoriaux. Les collectivités moyennes, et a fortiori celles accueillant une maternité, ont tout intérêt à ...
Les Inrocks
Mon, 01 Sep 2014 08:45:00 -0700

Quinze ans en arrière, la plateforme de messagerie avait déjà compris que les utilisateurs étaient friands de ces petites images qui remplaçaient allègrement les mots dans des conversations à bâton rompu, formant à elles seules un nouveau langage.
Al Huffington Post
Mon, 01 Sep 2014 12:27:48 -0700

A l'image d'une grande majorité des partis formant le paysage politique tunisien actuel, Ettakatol ira encore une fois seul aux élections. Le parti de Mustapha Ben Jaâfar, président de l'Assemblée nationale constituante (ANC), a présenté les listes ...

Oops, we seem to be having trouble contacting Twitter

Talk About Formant

You can talk about Formant with people all over the world in our discussions.

Support Wikipedia

A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia. Please add your support for Wikipedia!