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ADAPTIVE DIFFERENTIAL MICROPHONE ARRAY WITH DISTORTIONLESS RESPONSE AT ARBITRARY DIRECTIONS FOR HEARING AID APPLICATIONS

Citation Author(s):
Hala As’ad, Martin Bouchard, Homayoun Kamkar-Parsi
Submitted by:
Hala As'ad
Last updated:
20 November 2018 - 11:59pm
Document Type:
Poster
Document Year:
2018
Event:
Presenters:
Hala As'ad
Paper Code:
1242
 

An adaptive sub-band differential microphone array beamformer is proposed in order to achieve a distortionless response at arbitrary target directions, using two closely-spaced microphones in a hearing aid. Different variations are introduced to have a distortionless response in the target speaker direction. Two of these variations assume a free field environment when designing the beamformer, while two other designs consider the head shadow effect by using Head-Related Transfer Functions (HRTFs), for hearing aid applications. Simulation results show that the four proposed designs can outperform the standard sub-band design from the literature, in terms of back hemisphere noise reduction and target distortion. The results also illustrate the superiority of the HRTF-based designs over the free field-based designs, in terms of target distortion.

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