博碩士論文 102521071 詳細資訊




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姓名 許時懷(Shih-huai Hsu)  查詢紙本館藏   畢業系所 電機工程學系
論文名稱 語音特徵參數擷取之濾波器改良
(Improved Filter-bank of Speech Feature Coefficient Extraction)
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摘要(中) 本論文研究之主題為針對語音關鍵詞辨識系統中的特徵參數擷取部分進行改良。在整個關鍵詞辨識系統的架構中,擷取語音特徵參數主要是想凸顯每段不同聲音個別的特性,並且在擷取的過程又可達到減低資料量的效果,很多學者都曾在文獻中提出不同的方式來擷取出語音特徵參數,或是對其中的擷取方法來進行改良。
  本論文主要為討論在梅爾倒頻譜係數中數種改良後的濾波器組,將效果最好的濾波器組取代原本的梅爾三角濾波器組,經實驗結果發現,應用此改良後的濾波器組能夠提升關鍵詞萃取系統的辨識率,故證明此濾波器組能有效的加強擷取出之語音的特性。
摘要(英) The theme of this thesis is to improve the part of feature extraction in the speech keyword recognition. In the framework of the entire keyword recognition system, feature extraction is to highlight the individual features of different voices, and can reduce the amount of data by means of the extract process. Many researchers have presented different ways to extract the speech features in the literature, or on which making improvements at extracting feature coefficient method.
  This thesis discusses several improved filter bank in mel-frequency cepstral coefficients (MFCC). The best filter bank is used to replace the original mel-triangular filter set. The experimental results showed that the application of this improved filter bank can effectively improve the recognition rate of the keyword extraction system.
關鍵字(中) ★ 梅爾濾波器組
★ 語音特徵
★ 關鍵詞萃取
關鍵字(英) ★ mel-filterbank
★ speech feature
★ keyword spotting
論文目次 摘要 I
Abstract II
致謝 III
目錄 IV
圖目錄 V
表目錄 VI
第一章 緒論 1
1.1 研究動機 1
1.2 文獻回顧 2
1.3 章節概要 4
第二章 語音處理 6
2.1 語音特徵參數擷取 7
2.2 特徵參數的補償 15
2.3 隱藏式馬可夫模型 16
2.4 聲學模型 20
2.5 模型訓練 25
第三章 多種梅爾濾波器組 30
3.1 遮蔽效應 31
3.2 傳統 MFCC三角濾波器組 32
3.3 不同之梅爾濾波器組 35
3.3.1 矩形濾波器組(Rectangle filter) 36
3.3.2 梯形濾波器組(Trapezoid filter) 37
3.3.3 高斯濾波器組(Gaussian filter) 38
第四章 關鍵詞萃取 41
4.1 關鍵詞萃取系統架構 41
4.2 一階動態規劃系統 44
4.3 關鍵詞辨識流程 48
第五章 實驗結果與分析 50
5.1 實驗環境 50
5.2 實驗結果 52
第六章 結論與未來展望 58
6.1 結論 58
6.2 未來展望 58
參考文獻 60
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指導教授 莊堯棠(Yau-tarng Juang) 審核日期 2015-7-17
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