Directivity Control of a Microphone Array in the Vehicle Cabin

Abstract

Directional microphone can be used in the car. With the microphone, the driver may be under instructions to control the car audio system and information. Directional microphones make speech recognition accuracy to avoid receiving the other unwanted voice and external vehicle noise. This study investigates the directivity control of a microphone array used in the vehicle cabin communication system. Most of the literatures in the directivity control of a microphone array used the delay-and-sum beamforming method only. However a microphone array using 8 microphones combining the delay-and-sum beamforming with the optimization method is used in this work to control the directivity of the microphone array. Simulation results showed that the directivity of the microphone array could be improved significantly using the method proposed in this work.