论文标题:TM1300平台下AMR-WB算法的研究与优化
The Study and Optimization of AMR-WB Based on TM1300
论文作者
论文导师 常义林,论文学位 硕士,论文专业 军事通信学
论文单位 西安电子科技大学,点击次数 533,论文页数 70页File Size3578K
2006-01-01论文网 http://www.lw23.com/lunwen_24506207/
AMR-WB;TM1300 ;Speech coding ;Algorithm Optimizaiton;ACELP
随着现代无线通信特别是多媒体通信的发展,人们对语音通信的质量要求越来越高。3GPP/ETSI TS026和ITU-T 722.2标准确定的自适应宽带语音编解码器AMR-WB具有的低比特率、互操作性和高语音质量,使之不仅能够应用于无线通信领域,而且可广泛应用于其他各种通信系统和平台,包括:VoIP、因特网、PSTN高质量音频会议、音频流、ISDN宽带电话、ISDN可视电话和电视会议等。本文以ITU-T G.722.2为基础,对AMR-WB音频编码器的原理作了深入的研究。接着对广泛应用于音视频处理领域的DSP芯片-Philip公司TM1300作了简要介绍,然后对基于TM1300平台下AMR-WB定点算法的优化进行了重点分析。最后对优化后的算法进行了测试,并给出了优化结果。实验结果表明,优化后的程序执行效率相比优化前有了很大提高,这对于降低AMR-WB算法强度,从而利于其广泛应用有着一定的实际意义。
The current second-generation and third-generation (3G) mobile communication systems operate with narrow audio bandwidth limited to 200-3400Hz.As wireless systems are evolving from voice-telephony dominated services to multimedia and high-speed data services, the introduction of a wider bandwidth of 50–7000 Hz speech codec which provides substantially improved speech quality and naturalness is quite necessary. The Adaptive Multi-rate Wideband (AMR-WB) speech codec which was selected by 3GPP/ETSI and ITU-T can provide natural, present and comfortable codec speech and have higher intelligence and robustness in wireless systems. A wide range of applications are envisioned for AMR-WB, including ISDN wideband telephony and audio/video teleconferencing,Voice over IP and Internet applications such as IP video conferencing, voice mail, voice chat, broadcast, and voice streaming. This paper describes AMR-WB codec and its implementation optimization based on TM1300. Firstly, The principle of AMR-WB algorithm is discussed in detail, Secondly a brief introduction of the widely used audio/video DSP–TM1300,which is presented by Philip Corp, is given.Then we concentrate on the techniques of the optimization of AMR-WB algorithms based on TM1300. Finally, the result of the experiment is given out to show that distinctive improvement is obtaineded in efficiency and performance, and it is important for the implementation of AMR-WB in commerce.
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