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 39 for “"Acoustic Characteristics"”.
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Acoustic characteristics of fiberglass-lined circular ducts
… either dual-wall or single-wall. They have been acoustically treated and are intended to be used in heating, ventilation and air conditioning (HVAC) duct systems to reduce the amount of sound that is generated by the operation of the components of the system; To quantify the amount of the sound …
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Acoustic characteristics and intelligibility of clear and conversational speech at the segmental level
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1980.
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Impact of human vocal fold vibratory asymmetries on acoustic characteristics of sustained vowel phonation
… per second). Synchronized recordings of the acoustic voice signal were made to explore physiological-acoustic relationships that were not possible using clinical stroboscopic imaging systems. In an initial study of asymmetric vibration in 14 patients treated for laryngeal cancer, …
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The influence of attributions and acoustic characteristics of infant cries on perceptual responses of maltreating and comparison parents
The purpose of this study was to examine the effects of cry pitch and attributions that crying infants had or had not been abused on the perceptual ratings of maltreating and comparison parents. Twenty maltreating parents and 20 comparison parents rated 12 cries which varied in the pattern of their …
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Whistles of Sympatric Species of Bottlenose Dolphins (Tursiops truncatus) and Spotted Dolphins (Stenella frontalis) in the Bahamas: Acoustic Characteristics and Contextual Use
… from three Bahamas populations, and the acoustic parameters, structure, and contextual use of their whistles were analyzed. The mean acoustic parameters of spotted dolphins in the Bimini and White Sand Ridge Bahamas populations were higher in frequency than those of bottlenose dolphins, …
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Effects of duct source and termination impedance on the acoustic response characteristics of duct elements
… the effects of termination of an air duct on the acoustic response characteristics of the elements in the duct system. The end reflections due to the mis-match of the acoustic impedance at the termination affect the acoustic characteristics of the duct elements; The ducts of the duct system, …
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Music in Site: Integrating elements of site-specificity into composition
Architectural spaces and their acoustic characteristics offer unique musical material for the compositional process. Acoustic and physical design features of unorthodox performance spaces can become part of works and their performances. This thesis examines ways to integrate acoustic …
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Condition Classification in Underground Pipes Based on Acoustical Characteristics. Acoustical characteristics are used to classify the structural and operational conditions in underground pipes with advanced signal classification methods
… and sewer condition/defect analysis based on acoustic characteristics. Pattern recognition has been studied and used widely in many fields including: identification and authentication; medical diagnosis and musical modelling. Audio based classification and research has been mainly focusing on …
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Speaker model adaptation in automatic speech recognition.
… is the inter-speaker variability in which the acoustic characteristics of different speakers are not the same. There are mainly three approaches to overcome this problem; extract invariant information, multiple template representation and speaker adaptation. This thesis describes a study of …
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Relationships between cognitive status, speech impairment and communicative participation in Parkinson’s disease
… The contributions of cognitive impairment and acoustic speech characteristics remain equivocal. Relationships between Impairment and Participation levels of the International Classification of Functioning, Disability and Health (ICF) have not been thoroughly investigated. Methods: 45 people …
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Accent Conversion via Formant-based Spectral Mapping and Pitch Contour Modification
… efficient identification and analysis of acoustic features of different accents. Two British regional accents which display distinct differences to the human listener were used in this study as two typical British regional accents. Vowel based acoustic analysis was carried out to …
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New empirical equations for calculating sound pressure levels in rooms
Six room acoustic models were reviewed in the existing literature. There was no single acoustical model that was satisfactory for the rooms whose geometric and acoustic characteristics were different. In order to develop a new empirical room equation to predict the sound pressure distribution in …
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Analyzing Skid Resistance and Tire/Road Noise on Porous Pavement Using Numerical Modeling
… drainage and reduces tire/road noise through acoustic absorption. This study attempts to explore the development of numerical models in predicting skid resistance and tire/road noise on porous pavements. The drainage capacity of a porous surface is modeled by a simplified pore structure. This …
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A study of vowels /ɛ/ and /ɪ/ in African American English and standard American English
… the Detroit, Michigan area. I first analyzed the acoustic properties of a number of speech samples to determine vowel quality and duration measurements. I then performed speech perception tests using the same speech samples. My analyses support and contradict claims about AAE and SAE, particularly …
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Patterns of anticipatory coarticulation in adults and typically developing children
… three and six years. This study focuses on the acoustic characteristics of an unstressed vowel, the schwa, prior to a series of real words. Results indicate that children exhibit adult-like patterns of coarticulation even at a relatively young age. However, the degree of anticipatory …
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Non-invasive assessment of bacterial biofilm in the middle ear using low-coherence interferometry/optical coherence tomography and acoustic measurements
… (LCI)/optical coherent tomography (OCT) and acoustic measurements. Portable systems were constructed by integrating LCI/OCT techniques with a standard video otoscope to provide depth-resolved optical scattering properties of the middle ear. An automatic algorithm was written to classify the …
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Acoustic and linguistic interdependencies of irregular phonation
… phonation is used as a signal of linguistic and acoustic intent. Nonetheless, there remain fundamental questions about the nature of irregular phonation and the interdependencies of irregular phonation with acoustic and linguistic speech characteristics, as well as the implications of this …
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Effect of liner thickness on acoustic wave propagation in ducts
The acoustic characteristics of a point-reacting duct liner that consists of a porous facing sheet backed by cellular cavities are derived by examining the wave propagation within the liner. The relation between the derived expression for the liner acoustic admittance and a semi-empirical formula …
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A turbulent combustion noise model
… Sound Pressure Level (OASPL), (4) the thermoacoustic efficiency, (5) the peak frequency, and (6) the sound power of combustion generated noise. In addition, a correlation for sound power is developed based on fundamental burner and fuel variables known to affect the acoustic characteristics …
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