Placement Design of Microphone Arrays in Near-Field Broadband Beamformers
Placement Design of Microphone Arrays in Near-Field Broadband Beamformers
复制标题
近场宽带波束形成器中麦克风阵列的布局设计
DOI：
10.1109/tsp.2011.2178491
复制
发表时间：
2012-03-01
影响因子：
5.4
通讯作者：
Nordholm, Sven Erik
中科院分区：
文献类型：
--
作者：
Feng, Zhi Guo;Yiu, Ka Fai Cedric;Nordholm, Sven Erik
在波束形成器的设计中，麦克风阵列的配置往往是规定的，并改变滤波器的系数，以提高降噪性能。然而，麦克风元件的位置在整体性能中起着重要作用，应同时进行优化。本文针对这一问题进行了研究。为了理解通过位置移动的性能改进，我们首先看具有无限滤波器长度的设计，其给出了有限滤波器长度设计的性能限制。当滤波器长度有限时，滤波器系数和麦克风阵列的放置都是决策变量。在这两种情况下，问题都可以表示为约束优化问题。随着滤波器长度的增加，我们表明，性能迅速收敛到极限。为了说明，解决了两个数值例子。通过与几种常用配置的比较，表明优化配置的性能有了显著的提高。
In beamformer design, the microphone array configuration is often prescribed and the filter coefficients are varied in order to improve on the noise reduction performance. However, the positions of the microphone elements play an important role in the overall performance and should be optimized at the same time. This problem is addressed in this paper. In order to understand the performance improvement through location movements, we first look at the design with an infinite filter length, which gives the performance limit for finite filter length designs. When the filter length is finite, both the filter coefficients and the placement of the microphone array are decision variables. In both situations, the problems can be formulated as constrained optimization problems. As the filter length increases, we show that the performance converges quickly to the limit. For illustration, two numerical examples are solved. Comparing with several popular configurations, we show that the performance of the optimized configuration improves significantly.