摘要
为提高语音信号的编码质量和节省宽带资源,文中在传统的CVSD编码中加入了小波阈值去噪方法.首先讨论了小波阈值去噪中估计小波系数的软阈值和硬阈值方法,然后提出了一种改进方案.该方案在阈值函数中加入因子,可以自适应地减少阈值函数中的恒定偏差,最后对重构后的语音信号再进行CVSD的编译码.Matlab仿真实验证明了该改进方案的有效性和优越性.
In order to improve the encoding quality of speech signal and save the resource of bandwidth,we added the method of wavelet-thresholding denoising based on the traditional CVSD coding.We first present soft-thresholding and hard-thresholding denoising methods in wavelet thresholding denoising,then it presents a new thresholding function based on them,we add a factor to the modified project,which can be self-adaptivly reduce the fixed deviation in soft-thresholding function.Subsequently,we encode and decode the speech signal which has been reconstructed based on CVSD.In this paper,we validate the effectiveness and superority of the improved scheme by Matlab simulation.
出处
《微电子学与计算机》
CSCD
北大核心
2009年第5期138-141,共4页
Microelectronics & Computer
基金
国家自然科学基金项目(60572026)
教育部新世纪优秀人才支持计划(A0160419950120)
关键词
CVSD
小波变换
阈值函数
CVSD
wavelet transform
thresholding function
