一种低码率音频压缩编码的窗切换方法  

3-An Approach of Window Switching for Low Code Rate Audio Compression Coding

作　　者：何兵[1] 徐盛[1] 陈健[1] 

机构地区：[1]上海交通大学电子工程系,上海200030

出　　处：《电声技术》2001年第11期3-6,共4页Audio Engineering

摘　　要：当前主流音频压缩技术都采用窗切换技术来抑制预回声现象。然而编码器切换到短窗虽然提高了对暂态信号的时间分辨率出在短窗时采用一种非均匀时频变换方法来取代短窗时频变换高的频率分辨率,同时性和有效性。The state of the art audio encoders use window switching technology to reduce or avoid pre-echoes encountered during encoding. However, the frequency resolution decreases when working with shorter block. Therefore we present a non-uniform time-frequency transform(NUTFT) to replace the ordinary time-frequency transform used in short block. The NUTFT can obtain high resolution in low frequency band and accurate location of high frequency components in time axis. An experiment is shown in this paper demonstrates the feasibility and efficiency.

关 键 词：穿切换 音频编码 时频分解 预回声 低码率音频压缩编码 

分 类 号：TN912.3[电子电信—通信与信息系统]