
Formants are defined by Gunnar Fant 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 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,.....
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http://en.wikipedia.org/wiki/Formant

anything that limits, determines or defines
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(from the article `electronic music`) ...as do pipe organs. Signals rich in harmonic partials (such as sawtooth waves) are selected by the performer at the keyboard and combined and ... Groups of emphasized harmonics, known as formants, play a crucial role in the vowel sounds produced by the human voice. Vocal formants arise from ... ...
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http://www.britannica.com/eb/a-z/f/47

of a complex sound, range of frequencies in which there is a local maximum in the sound spectrum NOTE - The frequency at the maximum is the formant frequency.
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An element in the sound of a voice or instrument that does not change frequency as different pitches are sounded.
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Frequency component or resonance of an instrument or voice sound that doesn't change with the pitch of the note being played or sung. For example, the body resonance of an acoustic guitar remains constant, regardless of the note being played
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A resonant peak in a frequency spectrum. For example, the variable formants produced by the human vocal tract are what give vowels their characteristic sound.
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Type: Term Pronunciation: fōr′mănt Definitions: 1. Tones and their overtones including their intensities resulting from the production of vowel phonemes.
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Frequency component or resonance of an instrument or voice sound that doesn't change with the pitch of the note being played or sung. For example, the body resonance of an acoustic guitar remains constant, regardless of the note being played.
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http://www.traditionalmusic.co.uk/music%20tech%20glossary/Music%20Tech%20Gl

the range and number of partials present in a tone of a specific instrument, representing its timbre. · one of the regions of concentration of energy, prominent on a sound spectrogram, that collectively constitute the frequency spectrum of a speech sound. The relative positioning of the first and second formants, whether periodic or aperiod...
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https://www.infoplease.com/dictionary/formant
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