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Title: Investigations on the applications of dynamical instabilities and deterministic chaos for speech signal processing
Researcher: Prajith, P
Guide(s): Narayanan, N K
Keywords: Physics
Speech signal processing
Upload Date: 1-May-2012
University: University of Calicut
Completed Date: 02/01/2008
Abstract: This study investigates the potential use of Reconstructed Phase Space (RPS) based parameters for Speech Signal Processing by utilizing nonlinear dynamical systems theory. In this approach features are extracted from the time domain. Study of nonlinear dynamical system shows that the RPS is able to capture the nonlinear information of the underlying system, that cannot be captured by frequency domain analysis. A multimedia based system is converted into a low cost data acquisition system by adding a presampling antialiasing analog filter prior to A/D converter of the sound card. A speech database of short vowels in Malayalam is created. Nonlinear invariant parameters of vowel sounds are calculated. With these parameters one can quantify the chaotic behaviour of the speech signal. Reconstructed Phase Space is generated for speech sounds by the method of time delay embedding. From the reconstructed space, a unique parameter called Reconstructed Phase Space Distribution Parameter (RPSDP) is extracted. These parameters are found to be similar for same vowel and differ from vowel to vowel. They are further used in the recognition experiments. A new method for pitch estimation using Reconstructed Phase Space in two dimensions is presented. The proposed new method does not suffer from the limitations of other short term pitch estimation techniques. The problems in choosing the optimal time delay and the minimum embedding dimension for the reconstruction of phase space using the method of delays are addressed in this thesis. A simple procedure that quantifies expansion from the identity line of embedding space is developed for choosing proper time delay.
Pagination: 255p.
Appears in Departments:Department of Physics

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01_title.pdfAttached File34.63 kBAdobe PDFView/Open
02_dedication.pdf20.94 kBAdobe PDFView/Open
03_certificate.pdf14.9 kBAdobe PDFView/Open
04_declaration.pdf13.68 kBAdobe PDFView/Open
05_acknowledgements.pdf32.7 kBAdobe PDFView/Open
06_content.pdf26.56 kBAdobe PDFView/Open
07_abstract.pdf13.51 kBAdobe PDFView/Open
08_list of figures.pdf36.97 kBAdobe PDFView/Open
09_list of tables.pdf13.27 kBAdobe PDFView/Open
10_chapter 1.pdf43.26 kBAdobe PDFView/Open
11_chapter 2.pdf75.32 kBAdobe PDFView/Open
12_chapter 3.pdf288.29 kBAdobe PDFView/Open
13_chapter 4.pdf231.28 kBAdobe PDFView/Open
14_chapter 5.pdf1.13 MBAdobe PDFView/Open
15_chapter 6.pdf242.85 kBAdobe PDFView/Open
16_chapter 7.pdf1.65 MBAdobe PDFView/Open
17_chapter 8.pdf268.83 kBAdobe PDFView/Open
18_chapter 9.pdf119.8 kBAdobe PDFView/Open
19_chapter 10.pdf25.37 kBAdobe PDFView/Open
20_references.pdf74.83 kBAdobe PDFView/Open
21_list of publications.pdf14.02 kBAdobe PDFView/Open

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