一种低码率移动通信音频带宽扩展方法研究  

A Research of a Low Bit Rate Audio Bandwidth Extension Method for Mobile Communication

作　　者：潘磊[1] 董智勇[1] 

机构地区：[1]中原工学院计算机学院,河南郑州450007

出　　处：《河南工程学院学报（自然科学版）》2010年第2期47-50,共4页Journal of Henan University of Engineering：Natural Science Edition

基　　金：河南省科技攻关项目(082102210082)

摘　　要：在移动通信中,音频编解码器要求采用计算复杂度低、码率低并且高质量的音频编码算法.提出了一种新的低码率音频带宽扩展算法,利用码本映射法得到高频合成滤波器系数,编码端在复用码流中高频部分只传递量化的增益修正,从而只增加极少的编码比特数和运算复杂度即可重建高频分量,提高解码音质.A good audio codee for mobile communication should provide high quality with low bit rate and low computational complexity. This paper proposed a novel low bit rate audio coding bandwidth extension method, which can improve decoded audio quality with inoreasing only a few coding bits per frame and a little computational complexity. This method calculate high-frequency synthesis filter by using codebook mapping method, and transmit only quantified gain corrections in high - frequency part of multiplexing coding bit stream.

关 键 词：带宽扩展 码本映射 增益因子 

分 类 号：TP393.04[自动化与计算机技术—计算机应用技术]