EVALUATION OF AN ADAPTIVE BEAMFORMING METHOD FOR HEARING-AIDS

被引:134
作者
GREENBERG, JE
ZUREK, PM
机构
[1] Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts
关键词
D O I
10.1121/1.402446
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
In this paper evaluations of a two-microphone adaptive beamforming system for hearing aids are presented. The system, based on the constrained adaptive beamformer described by Griffiths and Jim [IEEE Trans. Antennas Propag. AP-30, 27-34 (1982)], adapts to preserve target signals from straight ahead and to minimize jammer signals arriving from other directions. Modifications of the basic Griffiths-Jim algorithm are proposed to alleviate problems of target cancellation and misadjustment that arise in the presence of strong target signals. The evaluations employ both computer simulations and a real-time hardware implementation and are restricted to the case of a single jammer. Performance is measured by the spectrally weighted gain in the target-to-jammer ratio in the steady state. Results show that in environments with relatively little reverberation: (1) the modifications allow good performance even with misaligned arrays and high input target-to-jammer ratios; and (2) performance is better with a broadside array with 7-cm spacing between microphones than with a 26-cm broadside or a 7-cm endfire configuration. Performance degrades in reverberant environments; at the critical distance of a room, improvement with a practical system is limited to a few dB.
引用
收藏
页码:1662 / 1676
页数:15
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