Dataset description

This dataset is comprised of acoustic Room Impulse Response (RIR) measurements using different measurement equipment at the iconic Auditorium A, in the Niels Bohr Institute, Copenhagen. The measurements were carried out during the days July 22^nd & 23^rd, 2023.

The dataset includes:

• rir_NBI_line.h5 – Sequential measurements over a line using a robotic arm (UR5, Universal Robots) for microphone positioning.
• rir_NBI_em32.h5 – Distributed RIRs measured with the 32-channel spherical microphone array Eigenmike (em32, mh Acoustics).
• rir_NBI_em32.sofa – SOFA format of the previous file.

The room

The Auditorium has a volume of approximately 126 m3 and is roughly rectangular with a tilted floor for the audience. The room was fully furnished with classroom equipment when measured. On one side wall, there are several interspaced windows.

The reverberation time in octave bands is:

The measurements

All measurements were obtained using an exponential sweep covering the frequencies 20-20k Hz. The specific duration of the sweep varies with the measurement setup and can be found in the corresponding file. The sampling rate is 48 kHz.

The source is a two-way loudspeaker (BM6, Dynaudio), and its position was kept constant throughout the entire measurement campaign. The remaining equipment utilised was an audio interface (Fireface UCX, RME), a loudspeaker amplifier, a microphone amplifier (Nexus, B&K).

The atmospheric conditions for each set of measurements are included in the corresponding file.

Related publications

This dataset is linked to the publication:

• Figueroa-Duran A. & Fernandez-Grande E., Reconstruction of reverberant sound fields over large spatial domains. In J. Acoust. Soc. Am. (2025), https://doi.org/10.1121/10.0034833

Contact

For any questions, please address them to antonio.figueroa@upm.es.