IC697CPX772
非特定人語音識(shí)別技術(shù)研究的最終目的是讓計(jì)算機(jī)等設(shè)備能夠“聽懂”人類語音，提取出語音中所包含的特定信息，成為人機(jī)通信和交互最便捷的手段。由于語音信號(hào)本身具有不確定性、動(dòng)態(tài)性和連續(xù)性，這就為準(zhǔn)確量化和處理該信號(hào)帶來非常大的困難，每個(gè)人的語音要建立不同的語音樣本也為識(shí)別的普及帶來瓶頸約束。目前的語音識(shí)別是先建立特征庫然后將待識(shí)別的信號(hào)經(jīng)處理與特征庫比對(duì)得到相似結(jié)果判定輸出。從本質(zhì)上屬于基于統(tǒng)計(jì)模式的基本理論，分語言模型訓(xùn)練、識(shí)別分析兩個(gè)大階段構(gòu)成和實(shí)現(xiàn)，如圖1所示。
聲學(xué)訓(xùn)練階段通常是離線完成的，由語言學(xué)家對(duì)預(yù)先收集好的海量語音樣本、語言數(shù)據(jù)庫、噪聲數(shù)據(jù)進(jìn)行信號(hào)處理和知識(shí)挖掘，通過語音信號(hào)處理理論及相應(yīng)數(shù)學(xué)算法模型建立語音識(shí)別系統(tǒng)所需要的“聲學(xué)模型”和“語言模型”。
識(shí)別分析階段通常是在線完成的，對(duì)用戶實(shí)時(shí)的語音進(jìn)行自動(dòng)識(shí)別。識(shí)別過程通常又可以分為“前端”和 “后端”兩大模塊：“前端”模塊主要的作用是進(jìn)行端點(diǎn)檢測、降噪、特征提取等；“后端”模塊的作用是利用訓(xùn)練好的“聲學(xué)模型”和“語言模型”對(duì)用戶說話的特征向量進(jìn)行統(tǒng)計(jì)模式識(shí)別，得到其包含的文字信息，此外，后端模塊還存在一個(gè)“自適應(yīng)”的反饋模塊，可以對(duì)用戶的語音進(jìn)行自學(xué)習(xí)，
IC697CPX772
IC697CPX772聯(lián)系人：李先生
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