[1]汤一彬,吴镇扬.一种自适应速率的线谱频率参数暂时分解算法[J].东南大学学报(自然科学版),2009,39(1):6-11.[doi:10.3969/j.issn.1001-0505.2009.01.002]
 Tang Yibin,Wu Zhenyang.Adaptive rate temporal decomposition algorithm for line spectral frequency parameters[J].Journal of Southeast University (Natural Science Edition),2009,39(1):6-11.[doi:10.3969/j.issn.1001-0505.2009.01.002]
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一种自适应速率的线谱频率参数暂时分解算法()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
39
期数:
2009年第1期
页码:
6-11
栏目:
信息与通信工程
出版日期:
2009-01-20

文章信息/Info

Title:
Adaptive rate temporal decomposition algorithm for line spectral frequency parameters
作者:
汤一彬 吴镇扬
东南大学信息科学与工程学院, 南京 210096
Author(s):
Tang Yibin Wu Zhenyang
School of Information Science and Engineering, Southeast University, Nanjing 210096, China
关键词:
低速率语音编码 暂时分解 LSF参数量化 自适应速率
Keywords:
low bit-rate speech coding temporal decomposition LSF(line spectral frequency)parameters’ quantization adaptive rate
分类号:
TN912.3
DOI:
10.3969/j.issn.1001-0505.2009.01.002
摘要:
为了解决语音编码中线谱频率参数经传统暂时分解算法量化后编码速率波动的问题,对修正严格的暂时分解算法进行了改进,包括定义新的事件插入法则、引入事件消除机制和基于失真门限的编码速率自适应方法; 提出了一种自适应速率的线谱频率参数暂时分解算法.在新算法中,暂时分解所得失真都能受到约束控制,事件分解也更加灵活,并且能够有效抑制编码速率的波动.实验结果表明,新算法通过一定时间的自适应能够将参数编码速率稳定在所需编码速率附近,获得了较好的效果.
Abstract:
To solve the bit rate fluctuation problem of the line spectral frequency parameters’ quantization in speech encoding which is caused by the conventional temporal decomposition algorithm, an adaptive rate temporal decomposition algorithm for line spectral frequency parameters’ quantization is presented based on the modified restricted temporal decomposition algorithm, by adjusting the distortion threshold value with the new event insert rule definition and the event erasure mechanism. In the new algorithm, the distortion produced in the temporal decomposition process can be controlled and the event generation is more flexible with the effective restraint of the bit rate fluctuation. The experimental results show that, with a certain adapting time, the algorithm can adjust the parameter encoding rate to the vicinal area of the necessary coding rate stably and achieve a good performance.

参考文献/References:

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备注/Memo

备注/Memo:
作者简介: 汤一彬(1982—),男,博士生; 吴镇扬(联系人),男,教授,博士生导师,zhenyang@seu.edu.cn.
基金项目: 国家重点基础研究发展计划(973计划)资助项目(2002 CB312102).
引文格式: 汤一彬,吴镇扬.一种自适应速率的线谱频率参数暂时分解算法[J].东南大学学报:自然科学版,2009,39(1):6-11.
更新日期/Last Update: 2009-01-20