Harald Klemenz

Measurement and visualization of three‐dimensional directivity pattern

In order to optimize a new second‐order multimicrophone technology for a KEMAR dummy head, a three‐dimensional directivity measurement setup was developed. To minimize mechanical mass and to reduce total measurement time a C‐Bow setup was used, containing 18 calibrated loudspeakers. Those small tweeters identical in construction are placed in every 10 deg of elevation in a semicircular arc of 2‐m diameter. The only moving part of this setup is a full‐circle rotating KEMAR. The ANSI Standard 3.35 for directional measurement is fully supported and the required 48 measuring points are completed in less than 3 min. Using this fast and simple setup, the various responses attained from different latitudes need to be weighted to calculate a three‐dimensional directivity value. Utilizing an equally distributed number, for example 400 measuring points easily executable with this setup, weighting can be omitted and a three‐dimensional plot with high resolution can be visualized. Additionally, two‐dimensional cuts o...