Speech enhancement using nonlinear microphone array with noise adaptive complementary beamforming
Speech enhancement using nonlinear microphone array with noise adaptive complementary beamforming
复制标题
使用具有噪声自适应互补波束形成的非线性麦克风阵列进行语音增强
DOI：
10.1109/icassp.2000.859143
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
F. Itakura
中科院分区：
文献类型：
--
作者：
H. Saruwatari;S. Kajita;K. Takeda;F. Itakura
本文介绍了一种改进的互补波束形成麦克风阵列与一种新的噪声自适应。互补波束形成基于被设计成获得互补方向性图案的两种类型的波束形成器。在该系统中，波束形成器的两个方向性图案适应于噪声方向，使得每个噪声功率谱的期望值最小化。使用这种技术，即使声源的数量超过麦克风的数量，我们也可以实现每个噪声的方向零点。为了评估效果，语音增强实验进行了计算机模拟的基础上与两个元素的阵列和三个声源。与传统的谱减法级联自适应波束形成器相比，它表明，该阵列提高了信号-噪声比退化的语音超过6 dB，并执行超过18%，更好的字识别率时，干扰噪声是两个扬声器。
This paper describes an improved complementary beamforming microphone array with a new noise adaptation. Complementary beamforming is based on two types of beamformers designed to obtain complementary directivity patterns. In this system, two directivity patterns of the beamformers are adapted to the noise directions so that the expectation values of each noise power spectrum are minimized. Using this technique, we can realize the directional nulls for each noise even when the number of sound sources exceeds that of microphones. To evaluate the effectiveness, speech enhancement experiments are performed based on computer simulations with a two-element array and three sound sources. Compared with the conventional spectral subtraction method cascaded with the adaptive beamformer, it is shown that the proposed array improves the signal-to-noise ratio of degraded speech by more than 6 dB and performs more than 18% better in word recognition rates when the interfering noise is two speakers.