The Breadth and Depth of DSP课件.pptVIP

* Southeast University Department of Electrical Engineering The Breadth and Depth of DSP The Roots of DSP The roots of DSP are in the 1960s and 1970s when digital computers first became available. radar sonar oil exploration space exploration medical imaging The personal computer revolution of the 1980s and 1990s caused DSP to explode with new applications Southeast University Department of Electrical Engineering The Breadth and Depth of DSP Southeast University Department of Electrical Engineering The Breadth and Depth of DSP Southeast University Department of Electrical Engineering The Breadth and Depth of DSP Telecommunications Multiplexing 频分多址（FDMA）、时分多址（TDMA）、码分多址（CDMA） Compression Echo control Southeast University Department of Electrical Engineering The Breadth and Depth of DSP Audio Processing Music CD Mp3 Mix down Speech generation 一、机器再生一个预先存入的语音信号 二、声道模拟 语言合成可分成3个层次： （1）文字到语音的合成（Text-To-Speech） （2）概念到语音的合成（Concept-To-Speech） （3）意向到语音的合成（Intention-To-Speech） 文语转换过程 文本→文本处理→韵律处理→语音合成→输出 ↑ ↑ 词典/规则 语音库 Southeast University Department of Electrical Engineering The Breadth and Depth of DSP Speech recognition 对于人脑来说，语音识别是一件很简单的事情，但是对计算机来讲这很困难。 语音识别主要分为两步：特征量提取和特征量匹配 影响语音识别的因素 1、词汇量的大小 2、与说话者的相关性 3、环境因素 IBM ViaVoice 音频信号处理涉及到多学科，信号处理、声学、模式识别、语言学、通信和信息理论、生理学、计算机学科等。 Southeast University Department of Electrical Engineering The Breadth and Depth of DSP Image Processing Compression Medical x-rays CT（Computerized Tomography计算机X射线断层造影术） *