Introduction to a new 3-dimensional method to visualize sound directivity based on a moving microphone array and beamforming

摘要

The aim of all sound visualization methods is to show the acoustic behaviour of the object in test as precise as possible. Most accurate results can be reached with methods taking all directions of sound emittance into account. These 3-dimensional methods require either a high number of microphones or moving the sensors around the object and a 3D model of the object itself. This work will introduce a new method based on moving a microphone array around the test-object to gather information from all directions. Furthermore, a 3D model is automatically generated with an integrated 3D point scanner. The introduced method also allows to get and visualize information about the directivity of the emitted sound. The underlying fundamental principles and the theoretical background will be explained. Results of some example measurement will be presented and the limitations and possibilities of the method will be discussed.