全数字式扬声器阵列系统的设计与实现  

Design and Implementation of All-Digital Loudspeaker Array System

作　　者：马登永[1,2] 蔡野锋[2] 沐永生[2] 杨军[2] 周建明[1] 柴国强[1] 

机构地区：[1]苏州上声电子有限公司,江苏苏州215133 [2]中国科学院声学研究所通信声学实验室,北京100190

出　　处：《电声技术》2011年第11期25-29,共5页Audio Engineering

摘　　要：为了改善PWM调制技术存在的非线性失真和过采样速率较低的缺陷,近年来许多学者都致力于研究基于∑-Δ调制技术的全数字式扬声器系统的实现方法。在参考前人研究工作的基础上,给出了基于1 bit和3 bit编码方式的64元全数字式扬声器阵列系统的设计和实现方法,并在全消声室内测试了系统的频响、总谐波失真比和声场分布曲线,同时基于测试结果评价了系统性能。To improve the nonlinear distortion and the lower oversampling rate in PWM modulation mode, in recently years, many researchers are engaged in the research and development of the SDM - based （ Sigma - Delta Modulation） digital loudspeaker systems. Based on their achievements, the design and implementation of the 64 - element all - digital loudspeaker array based on the 1 - bit and 3 - bit SDM methods are presented in this paper. The frequency response, THD （ Total Harmonic Distortion） and the distribution of the sound pressure field are measured in the anechoic room and the performance of this system is evaluated based on these curves.

关 键 词：全数字式扬声器阵列 多比特∑-Δ调制 失配整形 声场叠加 

分 类 号：TN643[电子电信—电路与系统]