Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 81 for “"formant"”.
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Accent Conversion via Formant-based Spectral Mapping and Pitch Contour Modification
… of accents. Acoustic characteristics such as formant frequencies, fundamental frequency and its variation slope, intensity of speech, and duration of phone were used for accent acoustic analysis. In this dissertation, accent conversion via formants modification and pitch contour manipulation …
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An investigation of vowel formant tracks for purposes of speaker identification.
Thesis. 1975. M.S.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Formant Deflection Directions of the Voiced Alveolar Stop Consonant in Different Vowel Contexts
… times to create different onglide and offglide formant deflection patterns. It was hypothesized that the formant deflection directions caused by the onset and release of the consonant constriction relative to the underlying vowel-to-vowel formant transitions (i.e., without consonant …
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Formant and burst spectral measurements with quantitative error models for speech sound classification
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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A verification experiment of the second formant transition feature as a perceptual cue in natural speech
… emphasis on one important feature, the second formant (F2) transition. A review of historical arguments made for and against its role in the perception of speech, as well as theories that accentuate its significance, is provided. A verification experiment is run to evaluate the importance of …
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Adaptive auditory-motor control of the time-varying formant trajectories in vowels and its patterns of generalization
… their auditory feedback of the first and second formant trajectories during the production of the Mandarin triphthong /iau/. On the group level, subjects adaptively adjusted their productions to partially compensate for the perturbations in auditory feedback under both the F1 and F2 …
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Acoustic Modeling and Feature Selection for Speech Recognition
… part, a nonlinear dynamic system is proposed for formant tracking. Compared to previous formant trackers depending on least squares estimation of LPC coefficients, MUSIC (Multiple Signal Classification) and ESPRIT (Estimation of Signal Parameters via Rotational Invariance Techniques) are used to …
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The role of lower airway resonances in defining vowel feature contrasts
… pairs interact non-linearly with the vocal tract formants, producing narrow frequency bands within which formant structure is unstable. The broader frequency bands between lower airway resonances are thus potentially optimal for the reliable production and accurate perception of specific formant …
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Dynamic Acoustic -Articulatory Relations
… relationship between tongue movement and dynamic formant patterns. Based on an analysis of tongue edge deformation from Lateral X-Ray Cineflurographic films, I argue that there are only two basic dynamic patterns: the pivot and the arch. These dynamic structures emerge when the analysis focuses on …
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Exploiting pitch dynamics for speech spectral estimation using a two-dimensional processing framework
… an accurate spectral representation of speech formant structure when the voicing source exhibits a high fundamental frequency. Our work is inspired by auditory perception and physiological modeling studies implicating the use of temporal changes in speech by humans. Specifically, we develop and …
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An acoustic analysis of labialization of coronal nasal consonants in American English
… toward following word-initial labial consonants. Formant frequency measurements were taken from words ending with coronal nasal consonants in potentially assimilating sentence contexts, and identical words ending in labial nasal consonants, across vowel contexts. The frequency of the second …
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Tongue Retraction in Arabic: An Ultrasound and Acoustic Study
… of the tongue coupled with the first three formants to investigate the articulation of Arabic emphatics, pharyngeals and uvulars in five dialects (Egyptian, Jordanian, Palestinian, Saudi and Yemeni). The total number of subjects participating in this study was fifteen. The articulatory and …
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Sensorimotor adaptation to perturbations of vowel acoustics and is relation to perception
… auditory feedback. Specifically, the first formant frequency (F1) was shifted in the auditory feedback heard by naive adult subjects as they produced vowels in single syllable words. These results indicated that subjects demonstrate compensatory formant shifts in their speech. This …
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The phonetic correlates of pharyngealization and pharyngealization spread patterns in Cairene Arabic an acoustic and real-time magnetic resonance imaging study
… configuration is a lowering of the second formant frequency in surrounding vowels. The extent of the modification in the formant frequency is determined by the length and quality of the vowel. This study uses real-time magnetic resonance imaging (rtMRI) to investigate the acoustic and …
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Subtlottal coupling and vowel space : an investigation in quantal theory
We describe the attenuation of the second vowel formant peak near the second resonance of the subglottal system, and test whether it is a quantal acoustic-articulatory relation (Stevens 1972, 1989) dividing front and back vowels. We find strong evidence for this hypothesis within English and …
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French Pronunciation Learning and Computer-Mediated Visual Feedback
… visual acoustic information pertaining to vowel formant trajectories: students were instructed that formant trajectories correlated with degree of mouth aperture (F1), tongue frontness/backness (F2), and lip rounding (F3). Subjects also completed a questionnaire to determine their preferred mode …
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Acoustic characterization of the glides /j/ and /w/ in American English
… vowels through RMS amplitude reduction, first formant frequency reduction, open quotient increase, harmonics-to-noise ratio reduction, and fundamental frequency reduction. The acoustic data suggest that glides differ from their cognate high vowels /i,u/ in that the glides are produced with a …
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The Effect of Timbre and Vibrato on Vocal Pitch Matching Accuracy
… F5. These source signals were filtered using 5 formant patterns (A-E) of vowel /a/ constituting a total of 30 stimuli (5 formant patterns*3pitches*2 vibrato conditions). Procedure: Ten sopranos and 10 mezzo-sopranos with at least 3 years of individual voice training were recruited from the …
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Quantitative phonetic and frequency domain characterization of vocal blend for sung vowels
… suppression occurs after blending. Vowel formants, the resonance frequencies of cavities in the vocal tract, amplify higher harmonics close in frequency to a given formant frequency. Across all vowels, the 2nd, 3rd, and 4th formant drop 1-3 harmonics between the unblended and blended time …
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The role of linguistic contrasts in the auditory feedback control of Speech
… Subjects were found to compensate more for formant shifts that resulted in a phonetic category change than for formant shifts that did not, despite the identical magnitudes of the shifts. Furthermore, the extent of neural activation in superior temporal and inferior frontal regions was …
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