Bandeira Mariana, Baumann Uwe, Weißgerber Tobias
Laryngorhinootologie. 2018 Feb;97(2):92-99. doi: 10.1055/s-0043-122744. Epub 2017 Nov 29.
The delivery of directional cues of a hearing device microphone are highly dependent on the position of the microphones. The aim of this work was the evaluation of different microphone positions with regard to the transmission of interaural time and level differences as well as the spectral characteristics and its impact on the localization abilities.
Head-related transfer functions of 30 subjects were measured with three different omnidirectional microphones at different positions: in the pinna (ITP), behind the ear (BTE), at the entrance of the ear canal (EEC). Sound localization abilities of 12 bilateral CI users was assessed for the microphone positions ITP and BTE.
Only the microphone positions in the ear (ITP, EEC) could sample the spectral cues of the pinna. However, the positioning of the microphone inside of the pinna did not significantly improve sound localization abilities compared to BTE microphones. For sound incidence from rear significantly less front-back confusions were achieved with the microphone inside of the pinna.
The microphone position in the pinna showed only a slight improvement in sound localization compared with BTE microphones in CI users. A precondition for better sound localization abilities is the improvement of the delivery of temporal and spectral fine structure cues in CI systems.
听力设备麦克风的定向线索传递高度依赖于麦克风的位置。这项工作的目的是评估不同麦克风位置在双耳时间和电平差异传输、频谱特性及其对定位能力的影响方面的情况。
使用三个不同的全向麦克风在不同位置测量30名受试者的头部相关传递函数：耳廓内（ITP）、耳后（BTE）、耳道入口处（EEC）。评估了12名双侧人工耳蜗使用者在ITP和BTE麦克风位置的声音定位能力。
只有耳部的麦克风位置（ITP、EEC）能够采集耳廓的频谱线索。然而，与BTE麦克风相比，将麦克风置于耳廓内并不能显著提高声音定位能力。对于来自后方的声音入射，耳廓内的麦克风产生的前后混淆明显更少。
与人工耳蜗使用者的BTE麦克风相比，耳廓内的麦克风位置在声音定位方面仅略有改善。提高人工耳蜗系统中时间和频谱精细结构线索的传递是获得更好声音定位能力的一个前提条件。
