Documentation

Data was recorded in an anechoic chamber and in four realistic environments at the natural science campus of the University of Oldenburg: 2 office rooms, the cafeteria and outside in the courtyard of the University.

A description of the database can be found in the publication "Database of Multichannel In-Ear and Behind-the-Ear Head-Related and Binaural Room Impulse Responses". See below for additional information about the different environments.

Anechoic chamber

In the anechoic chamber, the azimuth and the elevation angles were varied for two different distances between the source and the HATS:

Distance 80 cm , 300 cm Elevation angle -10° : 10° : 20° Azimuth angle -180° : 5° : 0°

Sketches of the setup in the realistic environments can be found below (click on the image to view it in full size):

Office I	Office II	Cafeteria	Courtyard

Recordings of ambient sounds

Recordings of the ambient sounds were conducted in the Office II, Cafeteria and Courtyard environments. In the office room, different "office sounds" were recorded: telephone ringing, keyboard typing, the noise from ventilation which is installed in the ceiling and the sound of opening and closing the door.
In the cafeteria two recordings were done: the normal ambient sound while the people were eating and chatting and for the the second one, the people arround were asked to speak all the time to generate a realistic babble noise.
In the courtyard, ambient sound was recorded in one continuous session.

Microphone setup Rigth side of the artificial head with BTE-hearing aid mounted on the ear. The hearing aid includes three microphones (front, middle and rear) connected directly to an external pre-amplifier. The in-ear microphones are at the end of the ear canal. The distances between the microphones are given in millimeters. The distance between the left and the corresponding right BTE-hearing aid microphones is 164 mm.