Influence of temporal discretization schemes on formant frequencies and bandwidths in time domain simulations of the vocal tract system

2004 ◽  
Author(s):  
Peter Birkholz ◽  
Dietmar Jackel
Keyword(s):  
Time Domain ◽  
Vocal Tract ◽  
Formant Frequencies ◽  
Temporal Discretization ◽  
Discretization Schemes ◽  
Vocal Tract System

Single-matrix formulation of a time domain acoustic model of the vocal tract with side branches

2008 ◽  
Vol 50 (3) ◽  
pp. 179-190 ◽  
Author(s):  
Parham Mokhtari ◽  
Hironori Takemoto ◽  
Tatsuya Kitamura
Keyword(s):  
Time Domain ◽  
Vocal Tract ◽  
Acoustic Model ◽  
Matrix Formulation ◽  
Single Matrix

Correlation between vocal tract length, body height, formant frequencies, and pitch frequency for the five Japanese vowels uttered by fifteen male speakers

2012 ◽  
Author(s):  
Hiroaki Hatano ◽  
Tatsuya Kitamura ◽  
Hironori Takemoto ◽  
Parham Mokhtari ◽  
Kiyoshi Honda ◽  
...  
Keyword(s):  
Vocal Tract ◽  
Body Height ◽  
Tract Length ◽  
Formant Frequencies ◽  
Pitch Frequency

Formant Frequencies of Stuttered and Fluent Vowels

1987 ◽  
Vol 30 (3) ◽  
pp. 301-305 ◽  
Author(s):  
Robert A. Prosek ◽  
Allen A. Montgomery ◽  
Brian E. Walden ◽  
David B. Hawkins
Keyword(s):  
Vocal Tract ◽  
Formant Frequencies ◽  
Vowel Space

The formant frequencies of 15 adult stutterers' fluent and disfluent vowels and the formant frequencies of stutterers' and nonstutterers' fluent vowels were compared in an F1-F2 vowel space and in a normalized F1-F2 vowel space. The results indicated that differences in formant frequencies observed between the stutterers' and nonstutterers' vowels can be accounted for by differences among the vocal tract dimensions of the talkers. In addition, no differences were found between the formant frequencies of the fluent and disfluent vowels produced by the stutterers. The overall pattern of these results indicates that, contrary to recent reports (Klich & May, 1982), stutterers do not exhibit significantly greater vowel centralization than nonstutterers.

scholarly journals Field Propagation Experiments of Male African Savanna Elephant Rumbles: A Focus on the Transmission of Formant Frequencies

Animals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 167 ◽  
Author(s):  
Anton Baotic ◽  
Maxime Garcia ◽  
Markus Boeckle ◽  
Angela Stoeger
Keyword(s):  
Fundamental Frequency ◽  
Vocal Communication ◽  
Vocal Tract ◽  
Natural Habitat ◽  
Ecological Factors ◽  
Transmission Efficiency ◽  
Long Distance ◽  
African Savanna ◽  
Formant Frequencies ◽  
Resonance Frequencies

African savanna elephants live in dynamic fission–fusion societies and exhibit a sophisticated vocal communication system. Their most frequent call-type is the ‘rumble’, with a fundamental frequency (which refers to the lowest vocal fold vibration rate when producing a vocalization) near or in the infrasonic range. Rumbles are used in a wide variety of behavioral contexts, for short- and long-distance communication, and convey contextual and physical information. For example, maturity (age and size) is encoded in male rumbles by formant frequencies (the resonance frequencies of the vocal tract), having the most informative power. As sound propagates, however, its spectral and temporal structures degrade progressively. Our study used manipulated and resynthesized male social rumbles to simulate large and small individuals (based on different formant values) to quantify whether this phenotypic information efficiently transmits over long distances. To examine transmission efficiency and the potential influences of ecological factors, we broadcasted and re-recorded rumbles at distances of up to 1.5 km in two different habitats at the Addo Elephant National Park, South Africa. Our results show that rumbles were affected by spectral–temporal degradation over distance. Interestingly and unlike previous findings, the transmission of formants was better than that of the fundamental frequency. Our findings demonstrate the importance of formant frequencies for the efficiency of rumble propagation and the transmission of information content in a savanna elephant’s natural habitat.

Vocal tract area functions and formant frequencies in opera tenors’ modal and falsetto registers

2011 ◽  
Vol 129 (6) ◽  
pp. 3955-3963 ◽  
Author(s):  
Matthias Echternach ◽  
Johan Sundberg ◽  
Tobias Baumann ◽  
Michael Markl ◽  
Bernhard Richter
Keyword(s):  
Vocal Tract ◽  
Formant Frequencies

Changes in the Human Vocal Tract Due to Aging and the Acoustic Correlates of Speech Production

2003 ◽  
Vol 46 (3) ◽  
pp. 689-701 ◽  
Author(s):  
Steve An Xue ◽  
Grace Jianping Hao
Keyword(s):  
Speech Production ◽  
Vocal Tract ◽  
Cost Effective ◽  
The Elderly ◽  
Cross Sectional ◽  
Men And Women ◽  
Acoustic Reflection ◽  
Dimensional Changes ◽  
Formant Frequencies ◽  
Age Related

This investigation used a derivation of acoustic reflection (AR) technology to make cross-sectional measurements of changes due to aging in the oral and pharyngeal lumina of male and female speakers. The purpose of the study was to establish preliminary normative data for such changes and to obtain acoustic measurements of changes due to aging in the formant frequencies of selected spoken vowels and their long-term average spectra (LTAS) analysis. Thirty- eight young men and women and 38 elderly men and women were involved in the study. The oral and pharyngeal lumina of the participants were measured with AR technology, and their formant frequencies were analyzed using the Kay Elemetrics Computerized Speech Lab. The findings have delineated specific and similar patterns of aging changes in human vocal tract configurations in speakers of both genders. Namely, the oral cavity length and volume of elderly speakers increased significantly compared to their young cohorts. The total vocal tract volume of elderly speakers also showed a significant increment, whereas the total vocal tract length of elderly speakers did not differ significantly from their young cohorts. Elderly speakers of both genders also showed similar patterns of acoustic changes of speech production, that is, consistent lowering of formant frequencies (especially F1) across selected vowel productions. Although new research models are still needed to succinctly account for the speech acoustic changes of the elderly, especially for their specific patterns of human vocal tract dimensional changes, this study has innovatively applied the noninvasive and cost-effective AR technology to monitor age-related human oral and pharyngeal lumina changes that have direct consequences for speech production.

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