Array datasets R11-1018
In the download section we provide some example datasets to get familiar with SOFiA and to evaluate it. There are different scenarios taken in an anechoic chamber and in "real" rooms as listed below. Some of the application examples are based on that measurement data. All datasets are captured with a VariSphear spherical array measurement system, RME microphone preamplifiers and RME Hammerfall HDSP II audio interfaces. Different microphones and sources were used and are specified below.
The datasets can be imported to SOFiA using the readVSAdata() module.
For the examples 1-3 we have placed 4 sources (Genelec 1029A active 2-Way Speakers) in a circle of 2.5 meters radius and an angle spread of 30° around the array in an anechoic chamber (Room 8W4 at the Cologne University of Applied Sciences). The elevation is fixed at pi/2 (90°). The speakers were calibrated to deliver approximately identical sound pressure levels at the array position. They were driven thru a XTA DP224 PA speaker management system to apply different level and delay shifts.
Level differences and timing (From left to right as depicted in the figure above)
Example 4 is a dataset to evaluate a cardioid setup involving a Microtech Gefell M900 large diaphragm microphone. The source was a AD-Systems Flex15 PA Speaker with AD-Systems Impulse D1 system amplifier and was placed at a distance of approximately 4m to the array. The dataset was captured in the anechoic chamber.
Example 5Example 5 delivers measurement data from a real room. This is a common classroom with a volume of approx. 500m^3 and a surface of approx. 500m^2 (Measures: 20m x 8.5m x 3m). The mean RT60 is around 0.9s. Source and array were placed at a distance of 8m from each other. The source is a high power DSP-controlled 3-way dodecahedron (Sonic Ball) developed at the Cologne University of Applied Sciences wich offers a good omnidirectional radiation at the full audio bandwith.