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The source–filter model represents speech as a combination of a sound source, such as the vocal cords, and a linear acoustic filter, the vocal tract.While only an approximation, the model is widely used in a number of applications such as speech synthesis and speech analysis because of its relative simplicity.
Linear predictive coding (LPC) is a method used mostly in audio signal processing and speech processing for representing the spectral envelope of a digital signal of speech in compressed form, using the information of a linear predictive model. [1] [2] LPC is the most widely used method in speech coding and speech synthesis.
Speech analytics vendors use the "engine" of a 3rd party and others develop proprietary engines. The technology mainly uses three approaches. The phonetic approach is the fastest for processing, mostly because the size of the grammar is very small, with a phoneme as the basic recognition unit.
Praat (/ p r ɑː t / PRAHT, Dutch: ⓘ; transl. "Talk") is a free, open-source computer software package widely used for speech analysis and synthesis in phonetics [4] and other fields of linguistics. It was designed and continues to be developed by Paul Boersma and David Weenink at the University of Amsterdam. [4]
Voice problems that require voice analysis most commonly originate from the vocal folds or the laryngeal musculature that controls them, since the folds are subject to collision forces with each vibratory cycle and to drying from the air being forced through the small gap between them, and the laryngeal musculature is intensely active during speech or singing and is subject to tiring.
Rhetorical criticism, or communication analysis, is an individual collegiate event in which the speaker has ten minutes to present a speech. [3] The speech usually consists of an introduction, the presentation of a rhetorical artifact, a communication theory or model, the application of the communication theory to the artifact, the implications ...
Most studies of prosody have been based on auditory analysis using auditory scales. Auditorily, the major prosodic variables are: pitch of the voice (varying between low and high) length of sounds (varying between short and long) loudness, or prominence (varying between soft and loud) timbre or phonatory quality (quality of sound)
Discourse analysis (DA), or discourse studies, is an approach to the analysis of written, spoken, or sign language, including any significant semiotic event. [ citation needed ] The objects of discourse analysis ( discourse , writing, conversation, communicative event ) are variously defined in terms of coherent sequences of sentences ...