增强技术在正弦波模型中的应用  

Application of Enhancement Techniques in Sinusoid Model

作　　者：周宏[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：《上海交通大学学报》2002年第9期1254-1257,共4页Journal of Shanghai Jiaotong University

摘　　要：针对可用正弦波数量较少、带宽略嫌不够的实际情况 ,提出合成端采用带宽增强、线谱增强和断点内插等后处理方法 .采用带宽增强不需或只需很少的额外比特就可增加合成信号的有效带宽 ,提高正弦波的利用率 ,使音色变得更为亮丽 .采用线谱增强可增加合成信号的厚实感 ,减少或消除因谱线损失引起的派生噪声 .采用断点内插可弥补正弦波轨迹被强制截断的缺点 。Considering the limited number of available sinusoid peaks and comparatively low bandwidth, the new post processing methods in decoder such as “bandwidth enhanced”, “line enhanced” and “break interpolation” were proposed. With these technologies, the effective bandwidth can be extended to one more octave at the cost of only very few additional bits; the timbre tends to sound sharper, thicker and more beautiful; the derivative noise due to deficiency of spectral bins can be reduced or diminished.

关 键 词：带宽增强 线谱增强 断点内插 低码率音频编码 语音增强 增强技术 正弦波模型 

分 类 号：TN912.35[电子电信—通信与信息系统]