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首页> 外文期刊>The Journal of the Acoustical Society of America >Performance of an adaptive beamforming noise reduction scheme for hearing aid applications. II. Experimental verification of the predictions
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Performance of an adaptive beamforming noise reduction scheme for hearing aid applications. II. Experimental verification of the predictions

机译：助听器应用的自适应波束成形降噪方案的性能。二。预测的实验验证

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摘要

A method to predict the amount of noise reduction which can be achieved using a two-microphone adaptive beamforming noise reduction system for hearing aids [J. Acoust. Soc. Am. 109, 1123 (2001)] is verified experimentally. 34 experiments are performed in real environments and 58 in simulated environments and the results are compared to the predictions. In all experiments, one noise source and one target signal source are present. Starting from a setting in a moderately reverberant room (reverberation time 0.42 s, volume 34 m~3, distance between listener and either sound source 1 m, length of the adaptive filter 25 ms), eight different parameters of the acoustical environment and three different design parameters of the adaptive beamformer were systematically varied. For those experiments, in which the direct-to-reverberant ratios of the noise signal is +3 dB or less, the difference between the predicted and the measured improvement in signal-to-noise ratio (SNR) is -0.21 ± 0.59 dB for real environments and -0.25 ± 0.51 dB for simulated environments (average ± standard deviation). At higher direct-to-reverberant ratios, SNR improvement is systematically underestimated by up to 5.34 dB. The parameters with the greatest influence on the performance of the adaptive beamformer have been found to be the direct-to-reverberant ratio of the noise source, the reverberation time of the acoustic environment, and the length of the adaptive filter.
机译：一种使用助听器的两麦克风自适应波束形成降噪系统可以预测的降噪量的方法[J. co Soc。上午。 109，1123（2001）]进行了实验验证。在实际环境中进行了34个实验，在模拟环境中进行了58个实验，并将结果与​​预测结果进行了比较。在所有实验中，都存在一个噪声源和一个目标信号源。从中等混响房间的设置开始（混响时间0.42 s，音量34 m〜3，听众与任一声源之间的距离1 m，自适应滤波器的长度25 ms），八个不同的声学环境参数和三个不同的参数自适应波束形成器的设计参数被系统地改变。对于那些噪声信号的直接与混响比为+3 dB或更小的实验，对于信号噪声比，预测的和测量的改善之间的差异为-0.21±0.59 dB真实环境，模拟环境为-0.25±0.51 dB（平均值±标准偏差）。在较高的直接混响比下，SNR的改善被系统地低估了5.34 dB。已经发现，对自适应波束形成器的性能影响最大的参数是噪声源的直接混响比，声学环境的混响时间以及自适应滤波器的长度。

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