Yuan Meng. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references (leaves 85-91). / Abstracts in English and Chinese. / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- History of ASR development --- p.2 / Chapter 1.2 --- Fundamentals of automatic speech recognition --- p.3 / Chapter 1.2.1 --- Classification of ASR systems --- p.3 / Chapter 1.2.2 --- Automatic speech recognition process --- p.4 / Chapter 1.3 --- Performance measurements of ASR --- p.7 / Chapter 1.3.1 --- Recognition accuracy --- p.7 / Chapter 1.3.2 --- Complexity --- p.7 / Chapter 1.3.3 --- Robustness --- p.8 / Chapter 1.4 --- Motivation and goal of this work --- p.8 / Chapter 1.5 --- Thesis outline --- p.10 / Chapter 2 --- Signal processing techniques for front-end --- p.12 / Chapter 2.1 --- Basic feature extraction principles --- p.13 / Chapter 2.1.1 --- Pre-emphasis --- p.13 / Chapter 2.1.2 --- Frame blocking and windowing --- p.13 / Chapter 2.1.3 --- Discrete Fourier Transform (DFT) computation --- p.15 / Chapter 2.1.4 --- Spectral magnitudes --- p.15 / Chapter 2.1.5 --- Mel-frequency filterbank --- p.16 / Chapter 2.1.6 --- Logarithm of filter energies --- p.18 / Chapter 2.1.7 --- Discrete Cosine Transformation (DCT) --- p.18 / Chapter 2.1.8 --- Cepstral Weighting --- p.19 / Chapter 2.1.9 --- Dynamic featuring --- p.19 / Chapter 2.2 --- Practical issues --- p.20 / Chapter 2.2.1 --- Review of practical problems and solutions in ASR appli- cations --- p.20 / Chapter 2.2.2 --- Model of environment --- p.23 / Chapter 2.2.3 --- End-point detection (EPD) --- p.23 / Chapter 2.2.4 --- Spectral subtraction (SS) --- p.25 / Chapter 3 --- HMM-based Acoustic Modeling --- p.26 / Chapter 3.1 --- HMMs for ASR --- p.26 / Chapter 3.2 --- Output probabilities --- p.27 / Chapter 3.3 --- Viterbi search engine --- p.29 / Chapter 3.4 --- Isolated word recognition (IWR) & Connected word recognition (CWR) --- p.30 / Chapter 3.4.1 --- Isolated word recognition --- p.30 / Chapter 3.4.2 --- Connected word recognition (CWR) --- p.31 / Chapter 4 --- DSP for embedded applications --- p.32 / Chapter 4.1 --- "Classification of embedded systems (DSP, ASIC, FPGA, etc.)" --- p.32 / Chapter 4.2 --- Description of hardware platform --- p.34 / Chapter 4.3 --- I/O operation for real-time processing --- p.36 / Chapter 4.4 --- Fixed point algorithm on DSP --- p.40 / Chapter 5 --- ASR algorithm optimization --- p.42 / Chapter 5.1 --- Methodology --- p.42 / Chapter 5.2 --- Floating-point to fixed-point conversion --- p.43 / Chapter 5.3 --- Computational complexity consideration --- p.45 / Chapter 5.3.1 --- Feature extraction techniques --- p.45 / Chapter 5.3.2 --- Viterbi search module --- p.50 / Chapter 5.4 --- Memory requirements consideration --- p.51 / Chapter 6 --- Experimental results and performance analysis --- p.53 / Chapter 6.1 --- Cantonese isolated word recognition (IWR) --- p.54 / Chapter 6.1.1 --- Execution time --- p.54 / Chapter 6.1.2 --- Memory requirements --- p.57 / Chapter 6.1.3 --- Recognition performance --- p.57 / Chapter 6.2 --- Connected word recognition (CWR) --- p.61 / Chapter 6.2.1 --- Execution time consideration --- p.62 / Chapter 6.2.2 --- Recognition performance --- p.62 / Chapter 6.3 --- Summary & discussion --- p.66 / Chapter 7 --- Implementation of practical techniques --- p.67 / Chapter 7.1 --- End-point detection (EPD) --- p.67 / Chapter 7.2 --- Spectral subtraction (SS) --- p.71 / Chapter 7.3 --- Experimental results --- p.72 / Chapter 7.3.1 --- Isolated word recognition (IWR) --- p.72 / Chapter 7.3.2 --- Connected word recognition (CWR) --- p.75 / Chapter 7.4 --- Results --- p.77 / Chapter 8 --- Conclusions and future work --- p.78 / Chapter 8.1 --- Summary and Conclusions --- p.78 / Chapter 8.2 --- Suggestions for future research --- p.80 / Appendices --- p.82 / Chapter A --- "Interpolation of data entries without floating point, divides or conditional branches" --- p.82 / Chapter B --- Vocabulary for Cantonese isolated word recognition task --- p.84 / Bibliography --- p.85
| Identifer | oai:union.ndltd.org:cuhk.edu.hk/oai:cuhk-dr:cuhk_324923 |
| Date | January 2004 |
| Contributors | Yuan, Meng., Chinese University of Hong Kong Graduate School. Division of Electronic Engineering. |
| Source Sets | The Chinese University of Hong Kong |
| Language | English, Chinese |
| Detected Language | English |
| Type | Text, bibliography |
| Format | print, xi, 91 leaves : ill. ; 30 cm. |
| Rights | Use of this resource is governed by the terms and conditions of the Creative Commons “Attribution-NonCommercial-NoDerivatives 4.0 International” License (http://creativecommons.org/licenses/by-nc-nd/4.0/) |
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