【導(dǎo)讀】湖南涉外經(jīng)濟(jì)學(xué)院。電氣與信息工程學(xué)部

　　

【正文】 pacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec 12 解決方案。通過發(fā)展完全民族化的語音產(chǎn)業(yè)，培養(yǎng)一大批這方面的本地人才，才能推動這一技術(shù)的快速發(fā)展。 雖然目前國內(nèi)從事語音識別技術(shù)研究的單位不是很多，學(xué)科基礎(chǔ)薄弱，能進(jìn)行非特定人、 大詞匯量、連續(xù)語音識別的更是寥若晨星，但在國家 863 計劃的支持下，在我國科研人員長期艱苦的努力下，我國在語音技術(shù)研究水平和原型系統(tǒng)開發(fā)方面完全達(dá)到了世界級的水平。中科院自動化研究所模式識別國家重點(diǎn)實(shí)驗(yàn)室研制的漢語非特定人、連續(xù)語音聽寫機(jī)系統(tǒng)的普通話系統(tǒng)，其錯誤率可以控制在 10％以內(nèi) ，并具有非常好的自適應(yīng)功能。 SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec 13 第 3 章 端點(diǎn)檢測技術(shù)的現(xiàn)狀 隨著科技的進(jìn)步，語音端點(diǎn)檢測目前主要的目的是： ① 減少識別器的數(shù)據(jù)處理量：可以大量減少信號傳輸量及識別器的運(yùn)算負(fù)載，對于語音對話的實(shí)時識別有重要作用； ② 拒絕非語音的信號：對非語音信號的識別不僅是一種資源浪費(fèi)，而且有可能改變對話的狀態(tài)，造成對用戶的困擾； ③ 在需要打斷（ bargein）功能的系統(tǒng)中，語音的起始點(diǎn)是必須的。在端點(diǎn)檢測找到語音的起始點(diǎn)時，系統(tǒng)將停止提示音的播放。完成打斷功能； 在很長一段時間里，語音端 點(diǎn)檢測算法主要是依據(jù)語音信號的時域特性 [23]。其采用的主要參數(shù)有短時能量、短時平均過零率等，即通常說的基于能量的端點(diǎn)檢測方法。近年來，隨著通信業(yè)的迅猛發(fā)展，在各行業(yè)對通信系統(tǒng)語音質(zhì)量的客觀評價以及語音識別方法等技術(shù)實(shí)用化的強(qiáng)烈需求了，又出現(xiàn)了很多的語音端點(diǎn)檢測算法。它們主要是通過采用各種新特征參數(shù)，以提高算法的抗噪聲性能。如基于 1994年由 JunquaJ－ C 提出的 TF 參數(shù)的語音端點(diǎn)檢測 [45]，還有諸如倒譜系數(shù) [67]、短時頻帶方差 [8]、自相關(guān)相似距離[9]、信息熵 [1011]等也逐漸的被應(yīng)用到 端點(diǎn)檢測中。有時，還通過將信號的幾種特征組合成為一個新的特征參數(shù)業(yè)進(jìn)行端點(diǎn)檢測。對語音端點(diǎn)的判決方式也由原來的單一門限SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec 14 [12]、雙門限 [13]發(fā)展到基于模糊理論的判決方式 [14]。 SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaa