Near-field measurement of sound radiation from line speakers

Acoustic holography for determining the directional characteristics of loudspeaker systems with the help of near-field measurements

The radiation of a loudspeaker is traditionally measured in the far field, i.e. at a distance that is much larger than the geometric dimensions of the sound source. Such measurements require a low-reflection and interference-free measurement environment, which can only be implemented with great effort, especially for larger loudspeakers, such as those used for example as sound lines in professional sound reinforcement technology. A new method is to be developed that calculates the directional characteristics of the sound source, the radiated sound power and other acoustic parameters from sound pressure measurements that were determined in the near field of the source with the help of a microphone array scanner.