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{{Distinguish|Timber}}
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{{For|the Sophie B. Hawkins album|Timbre (album)}}
[[File:9577 Guitarz1970 Clean E9 Guitar Chord (Mike Tribulas).jpg|thumb|right|Spectrogram of the first second of an E9 chord played on a Fender Stratocaster guitar with noiseless pickups. Below is the E9 chord audio:
[[File:9577 Guitarz1970 Clean E9 Guitar Chord (Mike Tribulas).ogg]] ]]
 
In [[music]], '''timbre''' ({{IPAc-en|ˈ|t|æ|m|b|ər}} {{respell|TAM|bər}} or {{IPAc-en|ˈ|t|ɪ|m|b|ər}} {{respell|TIM|bər}}) also known as '''tone color''' or '''tone quality''' from [[psychoacoustics]], is the quality of a [[musical note]] or sound or tone that distinguishes different types of sound production, such as voices and [[musical instrument]]s, string instruments, wind instruments, and percussion instruments. The physical characteristics of sound that determine the perception of timbre include [[spectrum]] and [[envelope (waves)|envelope]].
 
In simple terms, timbre is what makes a particular musical sound different from another, even when they have the same pitch and [[loudness]]. For instance, it is the difference between a guitar and a piano playing the same note at the same loudness. Experienced [[musicians]] are able to distinguish between different instruments based on their varied timbres, even if those instruments are playing notes at the same [[Pitch (music)|pitch]] and [[loudness]].
 
==Synonyms==
 
''Tone quality'' and ''color'' are synonyms for ''timbre'', as well as the "''texture'' attributed to a single instrument". [[Hermann von Helmholtz]] used the German ''Klangfarbe'' (''tone color''), and [[John Tyndall]] proposed an English translation, ''clangtint''. But both terms were disapproved of by [[Alexander John Ellis|Alexander Ellis]], who also discredits ''register'' and ''color'' for their pre-existing English meanings (Erickson 1975, 7).
 
The sound of a [[musical instrument]] may be described with such words as ''bright'', ''dark'', ''warm'', ''harsh'', and other terms. There are also [[colors of noise]], such as [[Pink noise|pink]] and [[White noise|white]].
 
In visual representations of sound, timbre corresponds to the shape of the image (Abbado 1988, 3).
 
==American Standards Association definition==
The [[American Standards Association]] definition 12.9 of timbre describes it as "that attribute of sensation in terms of which a listener can judge that two sounds having the same [[loudness]] and [[Pitch (music)|pitch]] are dissimilar", adding, "Timbre depends primarily upon the spectrum of the stimulus, but it also depends upon the waveform, the sound pressure, the frequency location of the spectrum, and the temporal characteristics of the stimulus" (American Standards Association 1960, 45).
 
==Attributes==
 
Timbre has been called, "...the psychoacoustician's multidimensional waste-basket category for everything that cannot be labeled pitch or loudness." (McAdams and Bregman 1979, 34; ''cf.'' Dixon Ward 1965, 55 and Tobias 1970, 409).
 
Many commentators have attempted to decompose timbre into component attributes. For example, J. F. Schouten (1968, 42) describes the, "elusive attributes of timbre", as "determined by at least five major acoustic parameters", which [[Robert Erickson]] (1975) finds, "scaled to the concerns of much contemporary music":
 
# The range between [[tonality|tonal]] and [[noise]]like character
# The [[spectral envelope]]
# The [[ADSR envelope|time envelope]] in terms of rise, duration, and decay (ADSR—attack, decay, sustain, release)
# The changes both of [[spectral envelope]] (formant-glide) and [[fundamental frequency]] ([[Microtonal music|micro-intonation]])
# The [[prefix (acoustics)|prefix]], or [[Onset (audio)|onset]] of a sound, quite dissimilar to the ensuing lasting vibration
 
(Erickson 1975, 6) gives a table of subjective experiences and related physical phenomena based on Schouten's five attributes:
 
{|
| '''''Subjective'''''
| '''''Objective'''''
|-
| Tonal character, usually pitched
| Periodic sound
|-
| Noisy, with or without some tonal character, including [[rustle noise]]
| Noise, including random pulses characterized by the rustle time (the mean interval between pulses)
|-
| Coloration
| Spectral envelope
|-
| Beginning/ending
| Physical rise and decay time
|-
| Coloration glide or formant glide
| Change of spectral envelope
|-
| Microintonation
| Small change (one up and down) in frequency
|-
| [[Vibrato]]
| Frequency modulation
|-
| [[Tremolo]]
| Amplitude modulation
|-
| Attack
| Prefix
|-
| Final sound
| Suffix
|}
 
See also "Psychoacoustic evidence" below.
 
===Harmonics===
[[File:Harmonic spectra theoretical x y.png|thumb|Harmonic spectra.]]
 
The richness of a sound or note a musical instrument produces is sometimes described in terms of a sum of a number of distinct [[frequency|frequencies]]. The lowest frequency is called the ''[[fundamental frequency]]'', and the [[pitch (music)|pitch]] it produces is used to name the note, but the fundamental frequency is not always the dominant frequency. The dominant frequency is the frequency that is most heard, and it is always a multiple of the fundamental frequency. For example, the dominant frequency for the transverse flute is double the fundamental frequency. Other significant frequencies are called [[overtone]]s of the fundamental frequency, which may include [[harmonic]]s and [[Harmonic series (music)#Partial|partials]]. Harmonics are [[Natural number|whole number]] multiples of the fundamental frequency, such as ×2, ×3, ×4, etc. Partials are other overtones. There are also sometimes [[subharmonic]]s at whole number ''divisions'' of the fundamental frequency. Most instruments produce harmonic sounds, but many instruments produce partials and [[inharmonic]] tones, such as cymbals and other [[Percussion_instrument#Indefinite_pitch|indefinite-pitched]] instruments.
 
When the [[A440 (pitch standard)|orchestral tuning note]] is played, the sound is a combination of 440&nbsp;Hz, 880&nbsp;Hz, 1320&nbsp;Hz, 1760&nbsp;Hz and so on. Each instrument in the orchestra produces a different combination of these frequencies, as well as harmonics and overtones.  The sound waves of the different frequencies overlap and combine, and the balance of these amplitudes is a major factor in the characteristic sound of each instrument.
 
[[William Sethares]] wrote that [[just intonation]] and the western [[Equal temperament|equal tempered]] [[Scale (music)|scale]] are related to the harmonic [[spectrum|spectra]]/timbre of many western instruments in an analogous way that the inharmonic timbre of the [[Music of Thailand|Thai]] renat (a xylophone-like instrument) is related to the seven-tone near-equal tempered [[pelog]] scale in which they are tuned. Similarly, the inharmonic spectra of [[Bali]]nese metallophones combined with harmonic instruments such as the stringed [[rebab]] or the voice, are related to the five-note near-equal tempered [[slendro]] scale commonly found in Indonesian [[gamelan]] music (Sethares 1998, 6, 211, 318).
 
===Envelope===
[[File:C Envelope follower.png|thumb|A signal and its envelope marked with red]]
The timbre of a sound is also greatly affected by the following aspects of its ''envelope:''  attack time and characteristics, decay, sustain, release ([[ADSR envelope]]) and [[Transient (acoustics)|transient]]s. Thus these are all common controls on [[Synthesizer (musical instrument)|synthesizer]]s. For instance, if one takes away the attack from the sound of a piano or trumpet, it becomes more difficult to identify the sound correctly, since the sound of the hammer hitting the strings or the first blast of the player's lips are highly characteristic of those instruments. The envelope is the overall amplitude structure of a sound, so called because the sound just "fits" inside its envelope: what this means should be clear from a time-domain display of almost any interesting sound, zoomed out enough that the entire waveform is visible.
 
==Timbre in music history==
 
The music of [[Debussy]], composed during the last decades of the nineteenth and the first decades of the twentieth centuries, has been credited with elevating the role of timbre in music:  "To a marked degree the music of Debussy elevates timbre to an unprecedented structural status; already in ''[[Prélude à l'après-midi d'un faune]]'' the ''color'' of [[flute]] and [[harp]] functions referentially" (Samson 1977, {{Page needed|date=November 2010}}).
 
==Psychoacoustic evidence==
Often, listeners can identify an instrument, even at different pitches and loudness, in different environments, and with different players. In the case of the [[clarinet]], acoustic analysis shows waveforms irregular enough to suggest three instruments rather than one. David Luce (1963, 16) suggests that this implies that, "Certain strong regularities in the acoustic waveform of the above instruments must exist which are invariant with respect to the above variables." However, Robert Erickson argues that there are few regularities and they do not explain our "...powers of recognition and identification." He suggests borrowing the concept of [[subjective constancy]] from studies of vision and [[visual perception]] (Erickson 1975, 11).
 
Psychoacoustic experiments from the 1960s onwards tried to elucidate the nature of timbre. One method involves playing pairs of sounds to listeners, then using a [[multidimensional scaling]] algorithm to aggregate their dissimilarity judgments into a timbre space. The most consistent outcomes from such experiments are that [[Brightness#Brightness_of_sounds|brightness]] or spectral energy distribution (Grey 1977), and the ''bite'', or rate and synchronicity (Wessel 1979) and rise time (Lakatos 2000), of the attack are important factors.
 
==Tristimulus timbre model==<!--merged from [[Tristimulus timbre model]] per b[[WP:Articles for deletion/Tristimulus timbre model]]-->
 
The concept of [[tristimulus]] originates in the world of colour, describing the way three primary colours can be mixed together to create a given colour. By analogy, the musical tristimulus measures the mixture of [[harmonic]]s in a given sound, grouped into three sections. The first tristimulus measures the relative weight of the first harmonic; the second tristimulus measures the relative weight of the 2nd, 3rd, and 4th harmonics taken together; and the third tristimulus measures the relative weight of all the remaining harmonics (Peeters 2003; Pollard and Jansson 1982, {{Page needed|date=December 2013}}):
 
:<math>T1 = \frac{a_1}{\sum_{h=1}^{H}{a_h}}</math>
 
:<math>T2 = \frac{a_2 + a_3 + a_4}{\sum_{h=1}^{H}{a_h}}</math>
 
:<math>T3 = \frac{\sum_{h=5}^{H}{a_h}}{\sum_{h=1}^{H}{a_h}}</math>
 
==See also==
* [[Formant]]
 
==References==
* Abbado, Adriano (1988). "Perceptual Correspondences: Animation and Sound". MS Thesis. Cambridge: Massachusetts Institute of Technology.
* American Standards Association (1960). ''American Standard Acoustical Terminology''. New York: American Standards Association.
* Dixon Ward, W. (1965). "Psychoacoustics". In ''Audiometry: Principles and Practices'', edited by Aram Glorig, 55. Baltimore: Williams & Wilkins Co. Reprinted, Huntington, N.Y.: R. E. Krieger Pub. Co., 1977. ISBN 0-88275-604-4
* Dixon Ward, W. (1970) "[http://books.google.com/books?id=XNVsAAAAMAAJ&q=timbre+wastebasket&dq=timbre+wastebasket&lr=&as_brr=0&ei=GdzvSMWaMYPWsgObmIWYBw&pgis=1 Musical Perception]". In ''Foundations of Modern Auditory Theory'' vol. 1, edited by Jerry V. Tobias, {{Page needed|date=May 2010}}<!--Inclusive page numbers of the article needed.-->. New York: Academic Press. ISBN 0-12-691901-1.
* Erickson, Robert (1975). ''Sound Structure in Music''. University of California Press. ISBN 0-520-02376-5.
* Grey,  John M. (1977). "Multidimensional Perceptual Scaling of Musical Timbres". ''The Journal of the Acoustical Society of America'' 61(5):1270–77. {{doi|10.1121/1.381428}}
* Lakatos, S. (2000). "A Common Perceptual Space for Harmonic and Percussive Timbres". ''Perception & Psychophysics'' 62(7):1426–39. PMID 11143454.
* Luce, David A. (1963). "Physical Correlates of Nonpercussive Musical Instrument Tones", Ph.D. dissertation. Cambridge: Massachusetts Institute of Technology.
* McAdams, Stephen, and Albert Bregman (1979). "Hearing Musical Streams". ''Computer Music Journal'' 3, no. 4 (December): 26–43, 60.
*Peeters, G. (2003) “[http://www.ircam.fr/anasyn/peeters/ARTICLES/Peeters_2003_cuidadoaudiofeatures.pdf A Large Set of Audio Features or Sound Description (Similarity and Classification) in the CUIDADO Project]”.{{Full|date=December 2013}}
*Pollard, H. F., and E. V. Jansson (1982) ''A Tristimulus Method for the Specification of Musical Timbre''. ''Acustica'' 51:162–71.
* Samson, Jim (1977). ''Music in Transition: A Study of Tonal Expansion and Atonality, 1900-1920''. New York: W.W. Norton & Company. ISBN 0-393-02193-9.
* Schouten, J. F. (1968). "The Perception of Timbre". In ''Reports of the 6th International Congress on Acoustics, Tokyo, GP-6-2'', 6 vols., edited by Y. Kohasi, {{Full|date=May 2010}}<!--Volume number needed.-->35–44, 90. Tokyo: Maruzen; Amsterdam: Elsevier.
* Sethares, William (1998). [http://books.google.com/books?id=KChoKKhjOb0C&printsec=frontcover&source=gbs_summary_r ''Tuning, Timbre, Spectrum, Scale'']. Berlin, London, and New York: [http://www.springer.com/978-1-85233-797-1 Springer]. ISBN 3-540-76173-X.
* Wessel, David (1979). "Low Dimensional Control of Musical Timbre". ''Computer Music Journal'' 3:45–52. Rewritten version, 1999, as "[http://mediatheque.ircam.fr/articles/textes/Wessel78a/ Timbre Space as a Musical Control Structure]".
 
{{Melody}}
{{opera terms}}
{{Timbre}}
{{Vocal Music}}
 
[[Category:Opera terminology]]
[[Category:Timbre|*]]

Revision as of 19:54, 12 February 2014

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