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Title: Analysis of Excitation Information in Expressive Speech
Researcher: Sudarsana Reddy Kadiri
Guide(s): Bayya Yegnanarayana
Keywords: Emotions
Engineering and Technology,Engineering,Engineering Electrical and Electronic
Excitation source
Expressive voice
Glottal closure instant
Glottal open region
Phonation type
Signal processing
Singing voice
University: International Institute of Information Technology, Hyderabad
Completed Date: 04/12/2018
Abstract: Speech often consists of expressive and nonverbal sounds in addition to the message to be conveyed. The objective of this thesis is to analyze expressive voices to determine the features needed for representing, newlinedescribing and discriminating different types of expressions. Here expression refers to the information in the signal produced by the speech production mechanism, that characterizes different phonations, emotions, singing (normal and artistic) and nonverbal sounds. Most of these expressive features are as a result of the variations in the excitation component of speech production processes, although it is difficult to isolate the excitation component from the dynamic vocal tract system component. Also, the expressiveness is reflected in the dynamics of the excitation component. Few methods for extracting the excitation source features rely on inverse filtering methods, newlinewhich are known to have limitation for high pitched voices such as emotional speech and singing voice. In this work, we propose a representation of the excitation source in terms of impulse-like sequence to capture variations in the source. Significance of the excitation source is studied for three types of expressive voices, namely, phonation types (in speech and singing), emotional speech and artistic (Noh) singing voice. The primary mode of excitation is due to vibration of the vocal folds at the glottis. Even though the excitation information is present throughout the glottal cycle, it is considered to be significant only when there is large newlinechange in a short-time interval, i.e., when it is impulse-like. The impulse-like characteristic is usually exhibited newlinearound the instant of glottal closure within each glottal cycle. Apart from the primary impulse-like excitation at the instant of glottal closure, other major and minor excitation impulses may also occur at glottal opening and in creaky voice. Other excitation impulses become prominent in aperiodic voices, like artistic (Noh) singing voice.
Pagination: All Pages
Appears in Departments:Department of Electronic and Communication Engineering

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02_copyright.pdf11.35 kBAdobe PDFView/Open
03_dedication.pdf20.67 kBAdobe PDFView/Open
04_certificate.pdf19.55 kBAdobe PDFView/Open
05_acknowledgement.pdf33.99 kBAdobe PDFView/Open
06_abstract.pdf24.38 kBAdobe PDFView/Open
07_contents.pdf39.25 kBAdobe PDFView/Open
08_list of figures and tables.pdf70.55 kBAdobe PDFView/Open
09_abbreviations.pdf20.63 kBAdobe PDFView/Open
10_chapter1.pdf41.7 kBAdobe PDFView/Open
11_chapter2.pdf390.93 kBAdobe PDFView/Open
12_chapter3.pdf1.01 MBAdobe PDFView/Open
13_chapter4.pdf2.39 MBAdobe PDFView/Open
14_chapter5.pdf638.39 kBAdobe PDFView/Open
15_chapter6.pdf291.99 kBAdobe PDFView/Open
16_chapter7.pdf2.45 MBAdobe PDFView/Open
17_chapter8.pdf37.92 kBAdobe PDFView/Open
18_list of publications.pdf37.5 kBAdobe PDFView/Open
19_appendix-a.pdf1.07 MBAdobe PDFView/Open
20_bibliography.pdf74.67 kBAdobe PDFView/Open

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