Comprehensive measurements of head influence on a supercardioid microphone

摘要

The directional pickup pattern of microphones is designed as to assist the audio engineer in avoiding acoustic feedbacks or interference from other sound sources. If the pattern deviates from the specified one, it is important for the audio engineer to know. This work presents comprehensive measurements of a supercardioid microphone directivity under the influence of a dummy head. The dummy models the diffraction of a human talker or singer in front of the microphone. The discussed measurements collect information on a 15x15 degree grid in, azimuth and elevation for different distances between microphone and dummy head. Based on these data, we are able to discuss the influence of a singer's body on the free field directivity of the supercardioid microphone, its directivity index and its front-to-back random ratio in detail.