Archer-Boyd Alan W, Whitmer William M, Brimijoin W Owen, Soraghan John J
Institute of Communication Acoustics, Ruhr-Universität Bochum, Building ID 2/231, 44780 Bochum, Germany
Medical Research Council/Chief Scientist Office Institute of Hearing Research-Scottish Section, New Lister Building, Glasgow Royal Infirmary, 16 Alexandra Parade, Glasgow G31 2ER, United Kingdom
J Acoust Soc Am. 2015 May;137(5):EL360-6. doi: 10.1121/1.4918297.
Sound sources at the same angle in front or behind a two-microphone array (e.g., bilateral hearing aids) produce the same time delay and two estimates for the direction of arrival: A front-back confusion. The auditory system can resolve this issue using head movements. To resolve front-back confusion for hearing-aid algorithms, head movement was measured using an inertial sensor. Successive time-delay estimates between the microphones are shifted clockwise and counterclockwise by the head movement between estimates and aggregated in two histograms. The histogram with the largest peak after multiple estimates predicted the correct hemifield for the source, eliminating the front-back confusions.
在双麦克风阵列(如双侧助听器)前方或后方同一角度的声源会产生相同的时间延迟以及两个到达方向估计值:前后混淆。听觉系统可以通过头部运动来解决这个问题。为了解决助听器算法中的前后混淆问题,使用惯性传感器测量头部运动。麦克风之间连续的时间延迟估计值会根据估计之间的头部运动顺时针和逆时针移动,并汇总到两个直方图中。多次估计后峰值最大的直方图预测了声源的正确半视野,消除了前后混淆。