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中文摘要：
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.
英文摘要：
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.
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