维普中文期刊产品整合服务

Improved MPEG-4 High-Efficiency AAC With Variable-Length Soft-Decision Decoding of the Quantized Spectral Coefficients

查看全文 作　　者：Sai [1,2]Han;Hongbing [1]Ma;Ping [2]Zhang;Tim [3]Fingscheidt 高影响力作者 机构地区：[1]China United Network Communications Group Company Limited,Beijing 100033,China;[2]Beijing University of Posts and Telecommunications,Beijing 100876,China;[3]Institute for Communications Technology,Technische Universitat Braunschweig,Braunschweig 38106,Germany高影响力机构 出　　处：《China Communications》索引2019年第16卷第10期,共18页高影响力期刊 摘　　要：MPEG-4 High-Efficiency Advanced Audio Coding (HE-AAC) is designed for low bit rate applications, such as audio streaming in mobile communications. The HE-AAC audio codec offers a better coding efficiency since variable-length codes (VLCs) are adopted. However, HE-AAC has originally been designed for storage and error-free transmission conditions. For the transmission over bit error-prone channels, error propagation is a serious problem for the VLCs. Therefore, a robust HE-AAC decoder is desired, especially for mobile communications. In contrast to traditional hard-decision decoding, utilizing bit-wise channel reliability information, softdecision (SD) decoding has been known to offer better audio quality. In HE-AAC, the global gain parameter is coded with fixedlength codes (FLCs), while the scale factors and quantized spectral coefficients are coded with VLCs. In this work, we apply FL/SD decoding to the global gain parameter, VL/SD decoding to the parameters scale factors and quantized spectral coefficients. Especially, in order to apply VL/SD decoding to the quantized spectral coefficients, a new modified trellis representation in VL/SD decoding is proposed. An improved HE-AAC performance is clearly observed, with the support of both instrumental measurements and a subjective listening test. 关 键 词：variable-length soft-decision decoding HE-AAC TRELLIS representation quantization spectral coefficients
相关文献

参考文献(35)

引证文献(4)

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1　渝公网安备 50019002500403号　违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费