4.2Kb/s码激励线性预测语音编码方案的实时实现
A REAL-TIME IMPLEMENTATION OF 4.2Kb/s CELP SPEECH CODING
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摘要: 本文表述了一个4.2Kb/s码激励线性预测语音编码方案在单个DSP上的实时实现;提出了一个减少自适应码本搜索复杂性的算法;讨论了A参数转变为LSP参数的求解方法;描述了该编码方案在具有一片TMS320C30的商用开发系统上的实时实现过程。
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关键词:
- 语音编码; 线性预测; 矢量量化
Abstract: This paper presents a real-time implementation of 4.2Kb/s CELP speech coding on single DSP. An algorithm reducing search complexity for adaptive codebook is suggested, the solving method, which changes a parameter into LSP parameter, is discussed. The real-tune implementation procedure of this coding on a commercial development board with a single TMS320C30 is discribed. -
Schroeder M R，Atal B S. Code-excited linear prediction(CELP): High quality speech at very low[2]bit rates. in Proc. IEEE Int. Conf. ASSP, Tampa, FL: 1985, 937-940.[3]Cuperman V, Gersho A, Pettigrew R. Low-delay vector excitation coding of speech at 16Kb/s. IEEE[4]Trans. on COM., 1992, COM-40(1): 129-139.[5]Gerson I, Jasiuk M A. Vector sum excited linear prediction(VSELP) speech coding at 8Kbps. in Proc. IEEE Int. Conf. ASSP, New Mexico, USA: 1990, 461-464.[6]Campbell J P, Welch V C, Tremain T E. An expandable error-protected 4800bps CELP coder(U. S.[7]Federal standard 4800bps voice coder). in Proc. IEEE Int. Conf. ASSP, Glasgow, Scotland: 1989, 735-738.[8]Bao Cha,ngchun, et al. Improved populating code-excited linear predictive coder. The Journal of[9]China Universities of Posts and Telecommunications. 1994, 1(1), 45-51.[10]鲍长春,等.码激励线性预测语音编码快速算法及评价.电子科学学刊,1995, 17(1): 70-79. -
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