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th different places and manners of articulation producing different acoustic results because the posture of the vocal tract not just the position of the tongue can affect the resulting sound the manner of articulation is important for describing the speech sound the words tack and sack both begin with alveolar sounds in english but differ in how far the tongue is from the alveolar ridge this difference has large effects on the air stream and thus the sound that is produced similarly the direction and source of the airstream can affect the sound the most common airstream mechanism is pulmonic using the lungs but the glottis and tongue can also be used to produce airstreams voicing and phonation types edit a major distinction between speech sounds is whether they are voiced sounds are voiced when the vocal folds begin to vibrate in the process of phonation many sounds can be produced with or without phonation though physical constraints may make phonation difficult or impossible for some articulations when articulations are voiced the main source of noise is the periodic vibration of the vocal folds articulations like voiceless plosives have no acoustic source and are noticeable by their silence but other voiceless sounds like fricatives create their own acoustic source regardless of phonation phonation is controlled by the muscles of the larynx and languages make use of more acoustic detail than binary voicing during phonation the vocal folds vibrate at a certain rate this vibration results in a periodic acoustic waveform comprising a fundamental frequency and its harmonics the fundamental frequency of the acoustic wave can be controlled by adjusting the muscles of the larynx and listeners perceive this fundamental frequency as pitch languages use pitch manipulation to convey lexical information in tonal languages and many languages use pitch to mark prosodic or pragmatic information for the vocal folds to vibrate they must be in the proper position and there must be air flowing through the glottis 49 phonation types are modeled on a continuum of glottal states from completely open voiceless to completely closed glottal stop the optimal position for vibration and the phonation type most used in speech modal voice exists in the middle of these two extremes if the glottis is slightly wider breathy voice occurs while bringing the vocal folds closer together results in creaky voice 61 the normal phonation pattern used in typical speech is modal voice where the vocal folds are held close together with moderate tension the vocal folds vibrate as a single unit periodically and efficiently with a full glottal closure and no aspiration 62 if they are pulled farther apart they do not vibrate and so produce voiceless phones if they are held firmly together they produce a glottal stop 61 if the vocal folds are held slightly further apart than in modal voicing they produce phonation types like breathy voice or murmur and whispery voice the tension across the vocal ligaments vocal cords is less than in modal voicing allowing for air to flow more freely both breathy voice and whispery voice exist on a continuum loosely characterized as going from the more periodic waveform of breathy voice to the more noisy waveform of whispery voice acoustically both tend to dampen the first formant with whispery voice showing more extreme deviations 63 holding the vocal folds more tightly together results in a creaky voice the tension across the vocal folds is less than in modal voice but they are held tightly together resulting in only the ligaments of the vocal folds vibrating e the pulses are highly irregular with low pitch and frequency amplitude 64 some languages do not maintain a voicing distinction for some consonants f but all languages use voicing to some degree for example no language is known to have a phonemic voicing contrast for vowels with all known vowels canonically voiced g other positions of the glottis such as breathy and creaky voice are used in a number of languages like jalapa mazatec to contrast phonemes while in other languages like english they exist allophonically there are several ways to determine if a segment is voiced or not the simplest being to feel the larynx during speech and note when vibrations are felt more precise measurements can be obtained through acoustic analysis of a spectrogram or spectral slice in a spectrographic analysis voiced segments show a voicing bar a region of high acoustic energy in the low frequencies of voiced segments 65 in examining a spectral splice the acoustic spectrum at a given point in time a model of the vowel pronounced reverses the filtering of the mouth producing the spectrum of the glottis a computational model of the unfiltered glottal signal is then fitted to the inverse filtered acoustic signal to determine the characteristics of the glottis 66 visual analysis is also available using specialized medical equipment such as ultrasound and endoscopy 65 h vowels edit ipa vowels front central back close i y ɨ ʉ ɯ u near close ɪ ʏ ʊ close mid e ø ɘ ɵ ɤ o mid e̞ ø̞ ə ɤ̞ o̞ open mid ɛ œ ɜ ɞ ʌ ɔ near open æ ɐ open a ɶ ä ɑ ɒ ipa help audio full chart template legend unrounded rounded vowels are broadly categorized by the area of the mouth in which they are produced but because they are produced without a constriction in the vocal tract their precise description relies on measuring acoustic correlates of tongue position the location of the tongue during vowel production changes the frequencies at which the cavity resonates and it is these resonances known as formants which are measured and used to characterize vowels vowel height traditionally refers to the highest point of the tongue during articulation 67 the height parameter is divided into four primary levels high close close mid open mid and low open vowels whose height are in the middle are referred to as mid slightly opened close vowels and slightly closed open vowels are referred to as near close and near open respectively the lowest vowels are not just articulated with a lowered tongue but also by lowering the jaw 68 while the ipa implies that there are seven levels of vowel height it is unlikely that a given language can minimally contrast all seven levels chomsky and halle suggest that there are only three levels 69 although four levels of vowel height seem to be needed to describe danish and it is possible that some languages might even need five 70 vowel backness is dividing into three levels front central and back languages usually do not minimally contrast more than two levels of vowel backness some languages claimed to have a three way backness distinction include nimboran and norwegian 71 in most languages the lips during vowel production can be classified as either rounded or unrounded spread although other types of lip positions such as compression and protrusion have been described lip position is correlated with height and backness front and low vowels tend to be unrounded whereas back and high vowels are usually rounded 72 paired vowels on the ipa chart have the spread vowel on the left and the rounded vowel on the right 73 together with the universal vowel features described above some languages have additional features such as nasality length and different types of phonation such as voiceless or creaky sometimes more specialized tongue gestures such as rhoticity advanced tongue root pharyngealization stridency and frication are required to describe a certain vowel 74 manner of articulation edit main article manner of articulation knowing the place of articulation is not enough to fully describe a consonant the way in which the stricture happens is equally important manners of articulation describe how exactly the active articulator modifies narrows or closes off the vocal tract 75 stops also referred to as plosives are consonants where the airstream is completely obstructed pressure builds up in the mouth during the stricture which is then released as a small burst of sound when the articulators move apart the velum is raised so that air cannot flow through the nasal cavity if the velum is lowered and allows for air to flow through the nose the result in a nasal stop however phoneticians almost always refer to nasal stops as just nasals 75 affricates are a sequence of stops followed by a fricative in the same place 76 fricatives are consonants where the airstream is made turbulent by partially but not completely obstructing part of the vocal tract 75 sibilants are a special type of fricative where the turbulent airstream is directed towards the teeth 77 creating a high pitched hissing sound 78 nasals sometimes referred to as nasal stops are consonants in which there s a closure in the oral cavity and the velum is lowered allowing air to flow through the nose 79 in an approximant the articulators come close together but not to such an extent that allows a turbulent airstream 78 laterals are consonants in which the airstream is obstructed along the center of the vocal tract allowing the airstream to flow freely on one or both sides 78 laterals have also been defined as consonants in which the tongue is contracted in such a way that the airstream is greater around the sides than over the center of the tongue 80 the first definition does not allow for air to flow over the tongue trills are consonants in which the tongue or lips are set in motion by the airstream 81 the stricture is formed in such a way that the airstream causes a repeating pattern of opening and closing of the soft articulator s 82 apical trills typically consist of two or three periods of vibration 83 taps and flaps are single rapid usually apical gestures where the tongue is thrown against the roof of the mouth comparable to a very rapid stop 81 these terms are sometimes used interchangeably but some phoneticians make a distinction 84 in a tap the tongue contacts the roof in a single motion whereas in a flap the tongue moves tangentially to the roof of the mouth striking it in passing during a glottalic airstream mechanism the glottis is closed trapping a body of air this allows for the remaining air in the vocal tract to be moved separately an upward movement of the closed glottis will move this air out resulting in it an ejective consonant alternatively the glottis can lower sucking more air into the mouth which results in an implosive consonant 85 clicks are stops in which tongue movement causes air to be sucked in the mouth this is referred to as a velaric airstream 86 during the click the air becomes rarefied between two articulatory closures producing a loud click sound when the anterior closure is released the release of the anterior closure is referred to as the click influx the release of the posterior closure which can be velar or uvular is the click efflux clicks are used in several african language families such as the khoisan and bantu languages 87 pulmonary and subglottal system edit further information breathing the lungs drive nearly all speech production and their importance in phonetics is due to their creation of pressure for pulmonic sounds the most common kinds of sound across languages are pulmonic egress where air is exhaled from the lungs 88 the opposite is possible though no language is known to have pulmonic ingressive sounds as phonemes 89 many languages such as swedish use them for paralinguistic articulations such as affirmations in a number of genetically and geographically diverse languages 90 both egressive and ingressive sounds rely on holding the vocal folds in a particular posture and using the lungs to draw air across the vocal folds so that they either vibrate voiced or do not vibrate voiceless 88 pulmonic articulations are restricted by the volume of air able to be exhaled in a given respiratory cycle known as the vital capacity the lungs are used to maintain two kinds of pressure simultaneously to produce and modify phonation to produce phonation at all the lungs must maintain a pressure of 3 5 cm h 2 o higher than the pressure above the glottis however small and fast adjustments are made to the subglottal pressure to modify speech for suprasegmental features like stress a number of thoracic muscles are used to make these adjustments because the lungs and thorax stretch during inhalation the elastic forces of the lungs alone can produce pressure differentials sufficient for phonation at lung volumes above 50 percent of vital capacity 91 above 50 percent of vital capacity the respiratory muscles are used to check the elastic forces of the thorax to maintain a stable pressure differential below that volume they are used to increase the subglottal pressure by actively exhaling air during speech the respiratory cycle is modified to accommodate both linguistic and biological needs exhalation usually about 60 percent of the respiratory cycle at rest is increased to about 90 percent of the respiratory cycle because metabolic needs are relatively stable the total volume of air moved in most cases of speech remains about the same as quiet tidal breathing 92 increases in speech intensity of 18 db a loud conversation has relatively little impact on the volume of air moved because their respiratory systems are not as developed as adults children tend to use a larger proportion of their vital capacity compared to adults with more deep inhales 93 source filter theory edit main article source filter model this section needs expansion you can help by adding missing information february 2020 the source filter model of speech is a theory of speech production which explains the link between vocal tract posture and the acoustic consequences under this model the vocal tract can be modeled as a noise source coupled onto an acoustic filter 94 the noise source in many cases is the larynx during the process of voicing though other noise sources can be modeled in the same way the shape of the supraglottal vocal tract acts as the filter and different configurations of the articulators result in different acoustic patterns these changes are predictable the vocal tract can be modeled as a sequence of tubes closed at one end with varying diameters and by using equations for acoustic resonance the acoustic effect of an articulatory posture can be derived 95 the process of inverse filtering uses this principle to analyze the source spectrum produced by the vocal folds during voicing by taking the inverse of a predicted filter the acoustic effect of the supraglottal vocal tract can be undone giving the acoustic spectrum produced by the vocal folds 96 this allows quantitative study of the various phonation types perception edit main article speech perception language perception is the process by which a linguistic signal is decoded and understood by a listener i to perceive speech the continuous acoustic signal must be converted into discrete linguistic units such as phonemes morphemes and words 97 to correctly identify and categorize s...