一种面向高采样率音频信号的参数音频编码系统  

A Parametric Audio Coding System Oriented to High Sampling Frequency Audio Signals

作　　者：夏田[1] 窦维蓓[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《电声技术》2005年第3期44-48,共5页Audio Engineering

摘　　要：通过对现有的各种参数音频编码方案进行比较和改进,提出了一种面向高采样率音频信号的参数音频编码系统,通过使用多分辨率正弦模型、多分辨率ERB噪声模型,辅以谐波结构分析、双变换短时成分检测与双变换短时模型,可在24Kb/(s·ch)的码率下实现对44.1kHz,48kHz采样音频信号的参数音频编码,主观音质良好。With a brief review of current method used in parametric audio coding, a parametric audio coding system is presented in this paper, which is oriented to high sampling frequency audio signals. The proposed system is composed of a multiresolution sinusoidal model and a multiresolution ERB noise model. As options for the system, harmonic structure analysis, dual-transform transient component detector and dual-transform transient model also make the system perform better for certain kinds of audio signals. With the help of all these models, the proposed parametric audio coding system can achieve an average bitrate of 24 Kb/(s·ch) for audio signals sampled at 44.1 kHz and 48 kHz with a good subjective quality.

关 键 词：参数音频编码 多分辨率正弦模型 ERB噪声模型 双变换短时模型 

分 类 号：TN912[电子电信—通信与信息系统]