Noise source identification with a spherical microphone array: application to a realistic environment

摘要

Spherical microphone array is a recent tool dedicated for noise source identification in variousrnenvironments: room, car or aircraft cabin, train interior, but also in free-field conditions. Thisrntype of microphone array supported by the spherical beamforming processing aims to localizernacoustic sources in all directions around the sphere. In particular it contributes to determine thernmost important sources for a given position of the sensor in the environment. When thernenvironment is an enclosed space, for example a car or a helicopter cabin, incident waves andrnreflections arrive at the sensor position from all directions, making necessary a 3D analysis of thernsound field. In this paper, we investigate the capabilities of such array in a realistic test case: thernsituation considered here is the identification of noise sources inside a car cabin. In the setup, thernsound field inside the cabin is generated by the engine, and different regimes are consideredrn(idle, run-up). It is shown the good performances in terms of resolution and dynamic range ofrnthis type of sensor for a relatively broad frequency range.