基于源镜像法的混响滤波器的设计与性能研究  

Design and Performance Research of Reverberation Filter System Based on Source Image Method

作　　者：童颖[1] 顾亚平[1] 杨小平[1] 张俊[1] 

机构地区：[1]中国科学院声学研究所东海研究站,上海200032

出　　处：《网络新媒体技术》2015年第1期24-27,共4页Network New Media Technology

摘　　要：为模拟不同环境下的混响效果,改善音频音质,本文设计了一种基于ARC600可配置处理器的数字混响系统。为设计一种房间参数可调的混响器,本文结合室内几何声学的特性,采用源镜像法得到前期混响的滤波器参数,采用改进的Schroeder模型模拟后期混响的特性,其中低通滤波器用来模拟空气对高频的吸收作用。用MATLAB软件对该系统进行仿真,仿真结果表明此混响算法能逼真的模拟厅堂的自然混响特性。最后依据ARC600内存结构对算法进行优化,运算速度提高了40%以上,增强了该系统在DSP平台上运行的实时性。To simulate reverberation effect in different environment and improve audio quality, a digital reverberation system based on ARC600 DSP is researched in this paper. In order to design a reverberation system which have adjustable room parameters, with the combination of the characteristics of room acoustics, this paper uses source image method to calculate filter parameters of the early re- verberation, and simulates the late reverberation by using improved Schroeder model, in which a low pass filter is used to simulate the effect of air absorption to high frequency. The simulation results obtained by MATLAB simulator show that this reverb algorithm can simulate natural reverberation characteristics realistically. After optimizing with the reference of ARC600 memory structure finally, it gains an additional 40 percents on the operation speed in 1 cycle, which enhances the real - time running on the DSP platform of the system.

关 键 词：数字混响系统 源镜像法 Schroeder模型 ARC600 

分 类 号：TN713[电子电信—电路与系统]