The Implementation and Analysis of the CELP Coder with a Dsp Processor
碩士 === 大同大學 === 電機工程研究所 === 85 === Nowadays, in the popular internet and personal communication network, the applications of digital speech signal will be promising and will be applied widely, so there is no doubt that the coder with low bit rates and high synthetic speech quality is important...
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ndltd-TW-085TTU034420012016-07-01T04:16:04Z http://ndltd.ncl.edu.tw/handle/84560912385965372785 The Implementation and Analysis of the CELP Coder with a Dsp Processor 以數位訊號處理器實現與分析CELP語音編碼器 Chiu, Ming-Fung 邱明鋒 碩士 大同大學 電機工程研究所 85 Nowadays, in the popular internet and personal communication network, the applications of digital speech signal will be promising and will be applied widely, so there is no doubt that the coder with low bit rates and high synthetic speech quality is important in this field. Code Excited Linear Prediction (CELP) is developed base on linear prediction and code excitation model, the scheme with potential to synthesize high speech quality at low bit rates. For example, the Federal Standard 1016 speech CODEC (encoder, decoder) can achieve high synthetic speech quality under 4.8k bps. Federal Standard 1016 speech encoder has three basic features: (1) Short-term linear prediction analysis, (2) Long-term adaptive codebook search and (3) Innovation stochastic codebook search. The objective of linear prediction analysis is to model physical shape of human vocal tract. Adaptive codebook is used to emulate the vibration of human vocal cords in order to produce period phenomenon of speech waveform. Stochastic codebook represents the air flow from lungs to lips. In this thesis, we will implement the Federal Standard 1016 speech CODEC with C language and discuss the problems we met in detail. Meanwhile, we will use TMS320C30 development system to implement the Federal Standard 1016 speech CODEC and analyze the implementation process. Chou, Chun-Hsien 周俊賢 1997 學位論文 ; thesis 56 zh-TW |
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碩士 === 大同大學 === 電機工程研究所 === 85 ===
Nowadays, in the popular internet and personal communication network, the applications of digital speech signal will be promising and will be applied widely, so there is no doubt that the coder with low bit rates and high synthetic speech quality is important in this field. Code Excited Linear Prediction (CELP) is developed base on linear prediction and code excitation model, the scheme with potential to synthesize high speech quality at low bit rates. For example, the Federal Standard 1016 speech CODEC (encoder, decoder) can achieve high synthetic speech quality under 4.8k bps.
Federal Standard 1016 speech encoder has three basic features: (1) Short-term linear prediction analysis, (2) Long-term adaptive codebook search and (3) Innovation stochastic codebook search. The objective of linear prediction analysis is to model physical shape of human vocal tract. Adaptive codebook is used to emulate the vibration of human vocal cords in order to produce period phenomenon of speech waveform. Stochastic codebook represents the air flow from lungs to lips.
In this thesis, we will implement the Federal Standard 1016 speech CODEC with C language and discuss the problems we met in detail. Meanwhile, we will use TMS320C30 development system to implement the Federal Standard 1016 speech CODEC and analyze the implementation process.
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author2 |
Chou, Chun-Hsien |
author_facet |
Chou, Chun-Hsien Chiu, Ming-Fung 邱明鋒 |
author |
Chiu, Ming-Fung 邱明鋒 |
spellingShingle |
Chiu, Ming-Fung 邱明鋒 The Implementation and Analysis of the CELP Coder with a Dsp Processor |
author_sort |
Chiu, Ming-Fung |
title |
The Implementation and Analysis of the CELP Coder with a Dsp Processor |
title_short |
The Implementation and Analysis of the CELP Coder with a Dsp Processor |
title_full |
The Implementation and Analysis of the CELP Coder with a Dsp Processor |
title_fullStr |
The Implementation and Analysis of the CELP Coder with a Dsp Processor |
title_full_unstemmed |
The Implementation and Analysis of the CELP Coder with a Dsp Processor |
title_sort |
implementation and analysis of the celp coder with a dsp processor |
publishDate |
1997 |
url |
http://ndltd.ncl.edu.tw/handle/84560912385965372785 |
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