题名低码率语音编码研究及实现(2400-9600比特/秒)
作者曾学文
学位类别博士
答辩日期1992
授予单位中国科学院声学研究所
授予地点中国科学院声学研究所
关键词语音波形编码 信号处理
其他题名Low-Bit Rate Speech Coding Research and Implementation (2400-9600 Bit/Second)
中文摘要本文首先对语音编码的发展及现状作了简单回顾与介绍,概括性地叙述了时域波形编码和变换域参数编码的几种主要算法的特点,对近十几年来基于先行预测(LPC)技术发展起来的几种语音压缩编码方法作了较详细的介绍。随后详细地叙述了LPC的基本原理,推导了几种主要的LPC算法的求解过程。参照美国标准LPC-10E算法对清浊判决,基音提取及激励源如何与理想激励源尽量相符作了较为深入细致的研究并用数字信号芯片(DSP)TMS320C30初步实现了一个码率为2400BPS的语音压缩编码系统。还详细介绍了9600BPS多脉冲激励LPC编码系统。
英文摘要This paper overviews the development and current status of speech coding including Waveform coding and Transform/parameter coding. The characteristics of some popular methods is generally reviewed. A detail introduction is given to several speech compress/coding alforithms that are developed by employing the linear Prediction Coding(LPC) technique. Then the paper gives a detail discription of LPC theory and solution process of several LPC algorithms. An intensive study inclution Unvoice/voice/silence detection and Pitch extraction and shaping excitation according to characteristics of LPC residual is performed. After the above simulatio, the algorithm is implemented on a TMS320C30 based floating point DSP development system, resulting in a 2400BPS vocoder. The final chapter is focused on a multi-pulse excite LPC(MPLPC) vocoder. This 9600BPS vocoder is implemented on a TMS320C25 based fixed pointed DSP development system.
语种中文
公开日期2011-05-07
页码80
内容类型学位论文
源URL[http://159.226.59.140/handle/311008/1210]  
专题声学研究所_声学所博硕士学位论文_1981-2009博硕士学位论文
推荐引用方式
GB/T 7714
曾学文. 低码率语音编码研究及实现(2400-9600比特/秒)[D]. 中国科学院声学研究所. 中国科学院声学研究所. 1992.
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