基于双传声器的蓝牙耳机降噪算法

用于免提通信设备的语音增强算法一直是研究的热点问题,而算法处理结果的音质问题近年来也备受关注。针对基于双传声器降噪的蓝牙耳机系统,将常用多通道传声器降噪算法归纳为基于相干函数法和基于空间预分离法这两大类进行分析和比较。基于相干函数法利用两个通道间信号的相干函数对含噪信号滤波达到降噪目的,而基于空间预分离法利用空间特性从含噪信号中分离出噪声参考信号来消除噪声。分析基于降噪量、语音音质和综合性能三个指标,从约束语音损伤的角度分析最优解的形式,并对比两类算法的实际性能。结果表明选择合适的算法可权衡降噪量与语音损伤,达到较好的综合性能。

Two Microphone based Noise Suppression Algorithms for Bluetooth Headsets

This paper categorizes various kinds of multi-channel noise suppression algorithms into two groups for analyzing two microphone based noise suppression algorithms for Bluetooth headset systems. One group is the coherence based algorithm, which employs the coherence function between signals in the two channels for noise suppression. Another group is the spatially preprocess based algorithm, which takes advantage of spatial information to separate the noise reference signal from the noisy signal. Two typical algorithms will be assessed based on the performance of noise reduction, speech distortion and overall performance and an optimal solution with speech distortion constraint will be analyzed. Evaluation results indicate that better overall performance can be achieved by taking balance between noise reduction and speech distortion.