Department of Electrical Engineering, Indian Institute of Technology Bombay, Powai, Maharashtra, India.
Int J Audiol. 2012 Apr;51(4):334-44. doi: 10.3109/14992027.2011.642012. Epub 2011 Dec 27.
The objective of the study was to evaluate the effectiveness of binaural dichotic presentation using comb filters with complementary magnitude responses, based on fixed bandwidth and auditory critical bandwidth, in improving speech perception by persons with moderate bilateral sensorineural hearing loss, and to assess its effect on localization of the sound source.
Listening tests involving consonant recognition and source direction identification were conducted on six normal-hearing subjects under simulated hearing loss and on eleven subjects with moderate bilateral sensorineural loss in quiet.
The tests on normal-hearing subjects showed higher recognition scores and smaller response times for the comb filters based on the auditory critical bandwidth. The tests using these comb filters on the hearing-impaired subjects resulted in an increase of 14%-31% (mean: 22%) in recognition scores and a significant decrease in response times, with no significant effect on the identification of the direction of broadband sound sources.
The results show that dichotic presentation may be useful for speech processing in binaural hearing aids.
本研究旨在评估基于固定带宽和听觉临界带宽的梳状滤波器对双侧中度感音神经性听力损失者言语感知的改善效果，并评估其对声源定位的影响。
在模拟听力损失的情况下，对 6 名正常听力受试者和 11 名双侧中度感音神经性听力损失受试者进行了包含辅音识别和声源方向识别的听力测试。
正常听力受试者的测试结果显示，基于听觉临界带宽的梳状滤波器具有更高的识别分数和更小的响应时间。在听力受损受试者中使用这些梳状滤波器的测试结果表明，识别分数提高了 14%-31%（平均提高 22%），响应时间显著缩短，对宽带声源方向的识别没有显著影响。
结果表明，在双耳助听设备中，双声道呈现可能对言语处理有用。
