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Improvement of Time Scale Modification Techniques for Speech Signals

Esmaeili, Hojjatollah | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41386 (19)
  4. University: Sharif University of Technology
  5. Department: Computer Engineering
  6. Advisor(s): Manzuri Shalmani, Mohammad Taghi
  7. Abstract:
  8. In this study, various methods of speech time scale modification are inspected and the most important one is modified. First, a brief review on all existing methods for audio time scale modification and its applications is presented in introduction section. As will be noted, the presented method could be classified in three classes of Time domain, Phase-vocoder and signal model. In next chapter a review on Time-domain methods is presented and its advantages and disadvantages have been addressed. Afterward, a review on Phase-vocoder and Signal-model methods is expressed in chapter 3 and 4 respectively. Considering the complexity and extent material relating to these techniques, the research had to be focused on one category. Phase-vocoder methods have better response for polyphonic sources which is subject of this thesis. Therefore the research focused on phased vocoder techniques. In chapter 5 an optimized method for Phase-vocoder methods is proposed. Then modified version of the method is presented. Using PESQ and LLR criteria we illustrate the proposed method has improved in quality respect to the state of art methods of Phase vocoder methods
  9. Keywords:
  10. Speech Time Scale Modification ; Perceptual Evaluation of Speech Quality (PESQ) ; Log-Likelihood Ratio (LLR) ; Phase Vocoder Method ; Constant Hop Size Multiresolution Peak Picking

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