  There is an emerging need for comparable data for multi-microphone
processing, particularly in acoustic sensor networks. However, commonly
available databases are often limited in the spatial diversity of the
microphones or only allow for particular signal processing tasks. In this
paper, we present a database of acoustic impulse responses and recordings for a
binaural hearing aid setup, 36 spatially distributed microphones spanning a
uniform grid of (5x5) m^2 and 12 source positions. This database can be used
for a variety of signal processing tasks, such as (multi-microphone) noise
reduction, source localization, and dereverberation, as the measurements were
performed using the same setup for three different reverberation conditions
(T_60\approx{310, 510, 1300} ms). The usability of the database is demonstrated
for a noise reduction task using a minimum variance distortionless response
beamformer based on relative transfer functions, exploiting the availability of
spatially distributed microphones.
