TETRA协议中语音压缩编译码算法研究及其DSP实现
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摘要
TETRA协议是欧洲电信标准协会(ETSI)1998年公布的一种数字集群通信系统标准。本文结合“基于TETRA的数字列车调度指挥系统”的实际项目,具体研究TETRA协议中语音压缩编译码算法及其DSP实现。
本文由语音信号的产生机理引入了语音信号的短时平稳特性,并在此基础上分析了线性预测编码(LPC)、合成分析(A-B-S)和码激励线性预测(CELP)技术。通过对TETRA 4.567kbit/s ACELP语音压缩编译码算法的研究,提出了基于ADSP 21535芯片的算法软硬件实现方案。文中给出了该算法的具体实现过程,并对其结果进行了分析验证。最后,在实践和阅读文献的基础上对算法提出了优化建议。
In 1998, ETSI publicized TETRA protocal, which is a standard of digital trunked radio communication system. Combined with the practical item of train attemper command system based on the TETRA protocol, this article researched the algorithm of TETRA speech compression coding and its DSP implementation.Short-time calm characteristics of audio signal is educed from the produce-mechanism of audio signal, Based on which the Linear Prediction Coding, the Analythsis-By-Synthesis technology, and Code-Excited Linear-Prediction coding are discussed. After researching the algorithm of TETRA 4.567kbit/s ACELP, its implementation scheme of software and hardware based on ADSP 21535 chips is designed, and the detail implementation procedure is presented in this article, the result is content. Furthermore, the algorithm is optimized based on the practical application and document.
本文由语音信号的产生机理引入了语音信号的短时平稳特性,并在此基础上分析了线性预测编码(LPC)、合成分析(A-B-S)和码激励线性预测(CELP)技术。通过对TETRA 4.567kbit/s ACELP语音压缩编译码算法的研究,提出了基于ADSP 21535芯片的算法软硬件实现方案。文中给出了该算法的具体实现过程,并对其结果进行了分析验证。最后,在实践和阅读文献的基础上对算法提出了优化建议。
In 1998, ETSI publicized TETRA protocal, which is a standard of digital trunked radio communication system. Combined with the practical item of train attemper command system based on the TETRA protocol, this article researched the algorithm of TETRA speech compression coding and its DSP implementation.Short-time calm characteristics of audio signal is educed from the produce-mechanism of audio signal, Based on which the Linear Prediction Coding, the Analythsis-By-Synthesis technology, and Code-Excited Linear-Prediction coding are discussed. After researching the algorithm of TETRA 4.567kbit/s ACELP, its implementation scheme of software and hardware based on ADSP 21535 chips is designed, and the detail implementation procedure is presented in this article, the result is content. Furthermore, the algorithm is optimized based on the practical application and document.
引文
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[2] ITU-TG.729[S], 1996
[3] John G Proakis.数字通信[M].北京:电子工业出版社,2003
[4] Channasandra Ravishankar, Spios Dimolitsas. Speech Coding[R], 1998
[5] Redwan Salami, Claude Laflamme, Jean-Pierre Adoul, Akitoshi Kataoka, Shinji Hayashi, Takehiro Moriya, Claude Lamblin, Dominique Massaloux, Massaloux, Stephane Proust, Peter Kroon, and Yair Shoham. Design and Description of CS-ACELP: A Toll Quality 8 kb/s Speech Coder[J], IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING, 1998
[6] 王炳锡.语音编码[M].西安:西安电子科技大学出版社,2002
[7] 胡广书,数字信号处理-理论、算法与实现[M].北京:清华大学出版社,2002
[8] 鲍长春,低比特率数字语音编码基础[M].北京:北京工业出版社,2001
[9] 王念旭,DSP基础与应用系统设计[M].北京:北京航空航天大学出版社,2002
[10] 代明桢、周建江,TMS320C54xDSP结构、原理及应用[M].北京:北京航空航天大学出版社,2002
[11] Jaewon Kim, Hyungjung Kim, Songin Cho,Younggap You,THE IMPLEMENTATION OF G.729 SPEECH CODER ON A 16-BIT DSP CHIP FOR THE CDMA IMT-2000 SYSTEM[J], IEEE TRANSACTIONS ON CONSUMER ELECTRONICS,1999
[12] 王涛、余松煜,结合DSP与PC技术的多路G.723语音编码方案[J],计算机工程,2002
[13] 董恩清、汪一鸣、李宏亮、候兴松、刘贵忠,基于局部余弦变换的2.4kb/s低比特率语音编码[J],西安交通大学学报,2003
[14] 刘志勇、唐昆、冯重熙,8kbit/s短时语音编码算法—LD-ACELP[J],清华大学学报,1997
[15] 万蕾、江凌、匡镜明,8kbit/s ACELP声码器的GSM平台仿真[J],北京理工大学学报,1999
[16] 田铮,随机过程(白皮书),西北工业大学,2003
[17] 于薇、赵胜辉、匡镜明,关于汉语/英语AMR语音编码参数统计特性的研究[J],电讯技术,2002
[18] Peter Kroon, Low Bit-Rate Speed Coder for Multimedia Communication[J], IEEE Communication Magazine, 1996
[19] Soon Y.Kwon,Hochong Park,Hyokang Chang, A HIGH QUALITY BI-CELP SPEECH CODER AT 8 KBIT/S AND BELOW[J], IEEE,1997
[20] R.Salami, C.Laflame, B.Bessette, J.P.Adoal, DESCRIPTION OF ITU-T RE-RECOMMENTATION G.729 ANNEX A:REDUCED COMPLEXITY 8KBIT/S CS-ACELP CODEC[J], IEEE, 1997
[21] Hong Kook Kim, ADAPTIVE ENCODING OF FIXED CODEBOOK IN CELP CODERS[J],IEEE,1998
[22] Chiouguey chen, G.729/A Speech CoderMultichannel TMS320C62x Implementation[R], Digital Signal Processing Solution, 1999
[2] ITU-TG.729[S], 1996
[3] John G Proakis.数字通信[M].北京:电子工业出版社,2003
[4] Channasandra Ravishankar, Spios Dimolitsas. Speech Coding[R], 1998
[5] Redwan Salami, Claude Laflamme, Jean-Pierre Adoul, Akitoshi Kataoka, Shinji Hayashi, Takehiro Moriya, Claude Lamblin, Dominique Massaloux, Massaloux, Stephane Proust, Peter Kroon, and Yair Shoham. Design and Description of CS-ACELP: A Toll Quality 8 kb/s Speech Coder[J], IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING, 1998
[6] 王炳锡.语音编码[M].西安:西安电子科技大学出版社,2002
[7] 胡广书,数字信号处理-理论、算法与实现[M].北京:清华大学出版社,2002
[8] 鲍长春,低比特率数字语音编码基础[M].北京:北京工业出版社,2001
[9] 王念旭,DSP基础与应用系统设计[M].北京:北京航空航天大学出版社,2002
[10] 代明桢、周建江,TMS320C54xDSP结构、原理及应用[M].北京:北京航空航天大学出版社,2002
[11] Jaewon Kim, Hyungjung Kim, Songin Cho,Younggap You,THE IMPLEMENTATION OF G.729 SPEECH CODER ON A 16-BIT DSP CHIP FOR THE CDMA IMT-2000 SYSTEM[J], IEEE TRANSACTIONS ON CONSUMER ELECTRONICS,1999
[12] 王涛、余松煜,结合DSP与PC技术的多路G.723语音编码方案[J],计算机工程,2002
[13] 董恩清、汪一鸣、李宏亮、候兴松、刘贵忠,基于局部余弦变换的2.4kb/s低比特率语音编码[J],西安交通大学学报,2003
[14] 刘志勇、唐昆、冯重熙,8kbit/s短时语音编码算法—LD-ACELP[J],清华大学学报,1997
[15] 万蕾、江凌、匡镜明,8kbit/s ACELP声码器的GSM平台仿真[J],北京理工大学学报,1999
[16] 田铮,随机过程(白皮书),西北工业大学,2003
[17] 于薇、赵胜辉、匡镜明,关于汉语/英语AMR语音编码参数统计特性的研究[J],电讯技术,2002
[18] Peter Kroon, Low Bit-Rate Speed Coder for Multimedia Communication[J], IEEE Communication Magazine, 1996
[19] Soon Y.Kwon,Hochong Park,Hyokang Chang, A HIGH QUALITY BI-CELP SPEECH CODER AT 8 KBIT/S AND BELOW[J], IEEE,1997
[20] R.Salami, C.Laflame, B.Bessette, J.P.Adoal, DESCRIPTION OF ITU-T RE-RECOMMENTATION G.729 ANNEX A:REDUCED COMPLEXITY 8KBIT/S CS-ACELP CODEC[J], IEEE, 1997
[21] Hong Kook Kim, ADAPTIVE ENCODING OF FIXED CODEBOOK IN CELP CODERS[J],IEEE,1998
[22] Chiouguey chen, G.729/A Speech CoderMultichannel TMS320C62x Implementation[R], Digital Signal Processing Solution, 1999