Publications
CONFERENCE (INTERNATIONAL) Linear Microphone Array Parallel to the Driving Direction for In-Car Speech Enhancement
Masanori Tsujikawa (NEC), Akihiko Sugiyama, Ken Hanazawa (NEC America), Yoshinobu Kajikawa (Kansai University)
2023 International Conference on Acoustics, Speech and Signal Processing (ICASSP 2023)
June 05, 2023
This paper proposes a linear microphone array parallel to the driving direction for in-car speech enhancement. In contrast to other linear microphone arrays in the car cabin reported in a literature or implemented as a commercial product, the array axis is arranged in parallel to the driving direction. Thanks to the $90$-degree rotated array axis with the constraints on the microphone position specific to the car environment, a mirror image of the directivity toward the talker with respect to the array axis is no longer projected in the direction of interference and redirected to a direction with no interference. As a result, the talker speech can be discriminated from the interference by directivity, leading to good interference reduction with little speech distortion. Simulation results with signals recorded in a car environment show that the proposed linear microphone array with the array axis parallel to the driving direction has a null in the direction of interference, which leads to $13$% higher word accuracy than the conventional microphone array with the array axis perpendicular to the driving direction.
Paper :
Linear Microphone Array Parallel to the Driving Direction for In-Car Speech Enhancement
(external link)