基于Lerner滤波器的线性相位音频均衡器设计方法  

Linear Phase Audio Equalizer Design Based on Lerner Filter

作　　者：杨小平[1,2] 童颖[1] 顾亚平[1,2] 张俊[1,2] 王毅[2] 

机构地区：[1]中国科学院声学研究所东海研究站,上海200032 [2]中国科学院上海声学实验室湖南国科微电子有限公司数字视音频技术联合实验室,湖南长沙410007

出　　处：《电声技术》2015年第6期28-30,44,共4页Audio Engineering

摘　　要：IIR(Infinite Impulse Response)滤波器设计的音频均衡器存在相位失真,而FIR(Finite Impulse Response)滤波器设计的音频均衡器的计算复杂度较高。Lerner滤波器具有近似线性相位、计算复杂度偏低等特点,提出了基于Lerner滤波器实现线性相位均衡器的方法,并给出了实现均衡器的结构和详细的设计步骤。计算机仿真结果表明该方法设计的均衡器具有频率选择性好、近似线性相位的优点。Audio equalizer with IIR filter has disadvantages of phase distortion, and using the FIR filter cost high compu- tation complexity. Lerner filter has characteristic of approximated linear phase, transition band sharpness and low - complexi- ty, the approach of digital equalizer based on Lerner filter is presemted, then this equalizer structure and detail design steps are presented. The computer simulate illustrate that the designed equalizer has advantage of better frequency - selectivity, little distort of phase.

关 键 词：图示均衡器 Lerner滤波器 倍频程 相位失真 

分 类 号：TN715[电子电信—电路与系统]