In speech science and phonetics, a formant is the broad spectral maximum that results from an acoustic resonance of the human vocal tract. In acoustics, a formant is usually defined as a broad peak, or local maximum, in the spectrum. For harmonic sounds, with this definition, the formant frequency is sometimes taken as that of the harmonic that is most augmented by a resonance. The difference between these two definitions resides in whether "formants" characterise the production mechanisms of a sound or the produced sound itself. In practice, the frequency of a spectral peak differs slightly from the associated resonance frequency, except when, by luck, harmonics are aligned with the resonance frequency, or when the sound source is mostly non-harmonic, as in whispering and vocal fry.
Phonetics is a branch of linguistics that studies how humans produce and perceive sounds or, in the case of sign languages, the equivalent aspects of sign. Linguists who specialize in studying the physical properties of speech are phoneticians. The field of phonetics is traditionally divided into three sub-disciplines based on the research questions involved such as how humans plan and execute movements to produce speech, how various movements affect the properties of the resulting sound or how humans convert sound waves to linguistic information. Traditionally, the minimal linguistic unit of phonetics is the phone—a speech sound in a language which differs from the phonological unit of phoneme; the phoneme is an abstract categorization of phones and it is also defined as the smallest unit that discerns meaning between sounds in any given language.
Phonology is the branch of linguistics that studies how languages systematically organize their phones or, for sign languages, their constituent parts of signs. The term can also refer specifically to the sound or sign system of a particular language variety. At one time, the study of phonology related only to the study of the systems of phonemes in spoken languages, but may now relate to any linguistic analysis either:
The Speech Assessment Methods Phonetic Alphabet (SAMPA) is a computer-readable phonetic script using 7-bit printable ASCII characters, based on the International Phonetic Alphabet (IPA). It was originally developed in the late 1980s for six European languages by the EEC ESPRIT information technology research and development program. As many symbols as possible have been taken over from the IPA; where this is not possible, other signs that are available are used, e.g. [@] for schwa, [2] for the vowel sound found in French deux 'two', and [9] for the vowel sound found in French neuf 'nine'.
The Extended Speech Assessment Methods Phonetic Alphabet (X-SAMPA) is a variant of SAMPA developed in 1995 by John C. Wells, professor of phonetics at University College London. It is designed to unify the individual language SAMPA alphabets, and extend SAMPA to cover the entire range of characters in the 1993 version of International Phonetic Alphabet (IPA). The result is a SAMPA-inspired remapping of the IPA into 7-bit ASCII.
In phonetics, the airstream mechanism is the method by which airflow is created in the vocal tract. Along with phonation and articulation, it is one of three main components of speech production. The airstream mechanism is mandatory for most sound production and constitutes the first part of this process, which is called initiation.
Acoustic phonetics is a subfield of phonetics, which deals with acoustic aspects of speech sounds. Acoustic phonetics investigates time domain features such as the mean squared amplitude of a waveform, its duration, its fundamental frequency, or frequency domain features such as the frequency spectrum, or even combined spectrotemporal features and the relationship of these properties to other branches of phonetics, and to abstract linguistic concepts such as phonemes, phrases, or utterances.
Articulation may refer to:
Auditory phonetics is the branch of phonetics concerned with the hearing of speech sounds and with speech perception. It thus entails the study of the relationships between speech stimuli and a listener's responses to such stimuli as mediated by mechanisms of the peripheral and central auditory systems, including certain areas of the brain. It is said to compose one of the three main branches of phonetics along with acoustic and articulatory phonetics, though with overlapping methods and questions.
Peter Nielsen Ladefoged was a British linguist and phonetician. He was Professor of Phonetics at University of California, Los Angeles (UCLA), where he taught from 1962 to 1991. His book A Course in Phonetics is a common introductory text in phonetics, and The Sounds of the World's Languages is widely regarded as a standard phonetics reference. Ladefoged also wrote several books on the phonetics of African languages. Prior to UCLA, he was a lecturer at the universities of Edinburgh, Scotland and Ibadan, Nigeria (1959–60).
Janet Pierrehumbert is Professor of Language Modelling in the Oxford e-Research Centre at the University of Oxford and a senior research fellow of Trinity College, Oxford. She developed an intonational model which includes a grammar of intonation patterns and an explicit algorithm for calculating pitch contours in speech, as well as an account of intonational meaning. It has been widely influential in speech technology, psycholinguistics, and theories of language form and meaning. Pierrehumbert is also affiliated with the New Zealand Institute of Language Brain and Behaviour at the University of Canterbury.
Kenneth Noble Stevens was the Clarence J. LeBel Professor of Electrical Engineering and Computer Science, and professor of health sciences and technology at the research laboratory of electronics at MIT. Stevens was head of the speech communication group in MIT's research laboratory of electronics (RLE), and was one of the world's leading scientists in acoustic phonetics.
Clinical linguistics is a sub-discipline of applied linguistics involved in the description, analysis, and treatment of language disabilities, especially the application of linguistic theory to the field of Speech-Language Pathology. The study of the linguistic aspect of communication disorders is of relevance to a broader understanding of language and linguistic theory.
Electropalatography (EPG) is a technique used to monitor contacts between the tongue and hard palate, particularly during articulation and speech.
Lev Vladimirovich Shcherba was a Russian Empire and Soviet linguist and lexicographer specializing in phonetics and phonology.
Edward Wheeler Scripture was an American physician and psychologist. He founded the experimental psychology laboratory at Yale University, directed the Vanderbilt Speech Clinic at Columbia University and was a founder of the American Psychological Association. Trained under experimental psychology pioneer Wilhelm Wundt, Scripture became best known for his contributions to speech science.
Voice Quality Symbols (VoQS) are a set of phonetic symbols used to transcribe disordered speech for what in speech pathology is known as "voice quality". This phrase is usually synonymous with phonation in phonetics, but in speech pathology encompasses secondary articulation as well.
Sociophonetics is a branch of linguistics that broadly combines the methods of sociolinguistics and phonetics. It addresses the questions of how socially constructed variation in the sound system is used and learned. The term was first used by Denise Deshaies-Lafontaine in their 1974 dissertation on Quebecois French, with early work in the field focusing on answering questions, chiefly sociolinguistic, using phonetic methods and data. The field began to expand rapidly in the 1990s: interest in the field increased and the boundaries of the field expanded to include a wider diversity of topics. Currently, sociophonetic studies often employ methods and insight from a wide range of fields including psycholinguistics, clinical linguistics, and computational linguistics.
Sidney Wood is a British-born retired Swedish phonetician and Research Fellow (docent).
Yiya Chen is a linguist and phonetician specializing in speech prosody. She is professor of phonetics at Leiden University as well as senior researcher at the Leiden Institute for Brain and Cognition.
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