Subband Inversion of Multichannel Acoustic Systems
Subband Inversion of Multichannel Acoustic Systems
复制标题
多通道声学系统的子带反演
DOI：
10.1007/978-1-84996-056-4_7
复制
发表时间：
2010
期刊：
影响因子：
3.3
通讯作者：
P. Naylor
中科院分区：
文献类型：
--
作者：
N. Gaubitch;P. Naylor
声传递函数均衡在语音去混响等声信号处理中有着重要的应用。ATF通常被建模为具有数千阶抽头和非最小相位特性的有限脉冲响应滤波器。在实践中，由于测量噪声、有限的估计精度和源-接收器几何形状的时间变化，仅可获得实际ATF的近似估计。这些问题使均衡成为一个难题。在本章中，我们讨论多通道均衡，重点是不精确的ATF估计。我们提出了一种多通道的均衡滤波器的设计方法，利用抽取和过采样的子带，其中的全带声脉冲响应被分解成等效的子带滤波器之前的均衡。该技术不仅计算效率更高，而且与全频带对应物相比对脉冲响应不准确更鲁棒。使用模拟和测量的ATF的仿真结果和子带方法的语音去混响的应用程序进行了演示和评估。
Equalization of Acoustic Transfer Functions (ATFs) is an important topic with several applications in acoustic signal processing including speech dereverberation. ATFs are often modelled as finite impulse response filters with orders of thousands of taps and non-minimum phase characteristics. In practice, only approximate estimates of the actual ATFs are available due to measurement noise, limited estimation accuracy and temporal variation of the source-receiver geometry. These issues make equalization a difficult problem. In this chapter, we discuss multichannel equalization with focus on inexact ATF estimates. We present a multichannel method for the equalization filter design utilizing decimated and oversampled subbands, where the full-band acoustic impulse response is decomposed into equivalent subband filters prior to equalization. This technique is not only more computationally efficient but also more robust to impulse response inaccuracies compared with the full-band counterpart. Simulation results using simulated and measured ATFs are presented and the application of the subband method to speech dereverberation is demonstrated and evaluated.