高保真无源分频器的幅频特性研究  

Research on Amplitude Frequency Characteristics of High Fidelity Passive Divider

作　　者：熊维德[1] 邱永正 张莉[1] 竹锦霞[1] 

机构地区：[1]四川文理学院物理与机电工程学院,四川达州635000

出　　处：《电声技术》2014年第8期31-34,共4页Audio Engineering

基　　金：四川省教育厅自然科学基金项目(08ZA134);四川文理学院大学生科学研究项目(201209)

摘　　要：采用protues和FilterSolutions软件对惠威DN-B9三分频器进行测试,发现合成后的声信号在各分频点附近的幅频特性曲线不理想,导致声音失真。通过对分频器的参数调整,低通滤波器由一阶变为二阶,分离相邻频段的截止频率,使相邻曲线交点的幅值有所下降,从而实现声信号幅频特性曲线平坦,有效地避免了分频点附近的信号过冲现象,降低了声信号的幅频失真。为广大电声爱好者改进分频器提供了一种有效的方法。After using protues and Filter Solutions software to test HuiWei DN - B9 three frequency divider, the ampli- tude frequency characteristic curve is not ideal, when the test to synthesized acoustic signals in the vicinity of each crossover point, leading to sound distortion. By adjusting the parameters of the frequency divider, changing the low pass filter by first order to the second order, the cutoff frequency separation of adjacent bands, the amplitude of the adjacent curve decreased, so as to achieve the flat of acoustic signal amplitude - frequency characteristic curve, it effectively avoid the phenomenon of sig- nal overshoot near the crossover point and reduces the amplitude frequency distortion of acoustic signals. It provides an effec- tive method to improve the frequency divider for the majority of electroacoustic lovers.

关 键 词：分频器 幅频特性 二阶低通滤波器 下限频率 上限频率 

分 类 号：TN912.2[电子电信—通信与信息系统]