摘要
为降低参量阵扬声器系统在非远场区域的失真程度,设计了一种基于幂级数形式的正交补偿算法,利用对角Volterra模型模拟参量阵扬声器系统的失真,离线地调整补偿成分的系数,并将不同频率的正弦信号作为输入,在换能器表面轴线方向垂直距离1.5 m处对该方法的失真抑制效果进行实验验证。实验结果显示,该方法与传统的正交调制方法相比提高了对参量阵扬声器系统谐波失真及互调失真的抑制作用,谐波失真及互调失真值分别下降了约13%和15%。
In order to reduce the distortion of the parametric loudspeakers in the non-far-field region,a quadrature amplitude modulation using power series was proposed.The one dimensional Volterra filter was introduced to model the distortion of parametric loudspeakers and adjust the coefficients of compensation component off-line.And sinusoidal signals were used as the input for parametric loudspeakers to verify validity of the compensation at a vertical distance of 1.5m in the direction of the surface axis of the transducer.The experimental results showed that the proposed method can improve the suppression effect of harmonic distortion and intermodulation distortion in parametric array loudspeaker system compared with the traditional orthogonal modulation method,and the values of harmonic distortion and intermodulation distortion decreased by 13%and 15%respectively.
作者
孙玮彦
季宏丽
裘进浩
李红元
吴逸飞
SUN Weiyan;JI Hongli;QIU Jinhao;LI Hongyuan;WU Yifei(Nanjing University of Aeronautics and Astronautics,Nanjing 210001,China;BeStar Smart Tech.,Ltd.,Nanjing 210001,China;BeStar Holding.,Ltd.,Nanjing 213000,China)
出处
《电声技术》
2020年第8期37-41,44,共6页
Audio Engineering
关键词
参量阵扬声器
正交调幅
对角Volterra模型
parametric loudspeaker
quadrature amplitude modulation
one dimensional Volterra filter
