Georg Götz, Sebastian J. Schlecht and Ville Pulkki
Motus: A dataset of higher-order Ambisonic room impulse responses and 3D models measured in a room with varying furniture
Companion page for the identically named paper published at the International Conference on Immersive and 3D Audio (I3DA), September 2021.
The article can be downloaded here: [IEEEXplore], [Aalto University's research portal]
The dataset can be downloaded here: [Zenodo]
Abstract
This paper presents a new dataset of higher-order Ambisonic room impulse responses. The measurements took place in a single room while varying the amount and placement of furniture. 830 different room configurations were measured with four source-to-receiver configurations, resulting in 3320 room impulse responses in total. The dataset features various furniture object placements, including non-uniform distributions of absorptive material and cases with occluded direct paths between source and receiver. All acoustic measurements are accompanied by matching 3D models and 360°-photographs of the room. After describing the dataset, we demonstrate its usage with a reverberation time analysis. The analysis reveals that most of our measurements follow the expected relationship between absorption area and reverberation time. Some exceptional cases feature particular room acoustic phenomena, such as non-uniform absorption area distributions or multi-slope decays. Additionally, we show with a large number of measurements that furniture placement can significantly affect the reverberation time of a room. The dataset can be used to investigate room acoustic topics such as the acoustic effects of absorber placements or the decay behavior of rooms.
Dataset description
The Motus dataset consists of higher-order Ambisonic RIRs measured in a single room with 830 different furniture configurations. In the following two videos, we showcase all measured room configurations of the dataset with spherical photographs and 3D models.
The Motus dataset was measured using an em32 Eigenmike microphone array and Genelec 1030A loudspeakers. Logarithmic sine sweeps with a length of 5 s were used as excitation signals. All RIRs were measured in a 4.9 m x 4.4 m x 2.9 m (approx. volume of 60 m2) seminar room of Aalto University. The dataset contains RIR measurements from four different source-to-receiver configurations.
The measurement room has concrete walls, a vinyl-coated concrete floor, a single door, and two large windows. Variation was introduced into the dataset by changing the number of furniture objects and their position and orientation. The furniture was mostly moved on the floor and rotated on the horizontal plane to represent common furniture placements. The furniture objects were positioned freely in space, i.e., they could be placed at the walls and at any other position inside the room. In some room configurations, the direct path between the loudspeakers and the microphone array was occluded.
Although the dataset consists of 830 unique room configurations, some of them feature the same amount of furniture objects and therefore differ only with respect to the furniture placement. More precisely, the room configurations of the dataset can be divided into 60 groups, each of which represents the room configurations with a particular amount of furniture objects or absorption area.
Sound examples
The following sound example are based on measurements of the present dataset. They were generated using the SPARTA VST Plugin-Suite [1]. More precisely, we first convolved the higher-order Ambisonic room impulse responses with dry mono signals using the sparta_matrixconv plugin. Then we auralized the results with a binaural ambisonic decoder based on the parametric COMPASS model [2] using the compass_binaural plugin.
The dry trumpet and brass section audio samples were taken from the Brückner piece in [3], and the dry speech samples are part of the TSP Speech Database [4].
Small amount of furniture (measurement #769)
Static, loudspeaker 1, trumpet:
Static, loudspeaker 4, trumpet:
Rotation, loudspeaker 1, trumpet:
Rotation, loudspeaker 4, trumpet:
Static, loudspeaker 1, brass section:
Static, loudspeaker 4, brass section:
Rotation, loudspeaker 1, brass section:
Rotation, loudspeaker 4, brass section:
Static, loudspeaker 1, speech:
Static, loudspeaker 4, speech:
Rotation, loudspeaker 1, speech:
Rotation, loudspeaker 4, speech:
Large amount of furniture (measurement #20)
Static, loudspeaker 1, trumpet:
Static, loudspeaker 4, trumpet:
Rotation, loudspeaker 1, trumpet:
Rotation, loudspeaker 4, trumpet:
Static, loudspeaker 1, brass section:
Static, loudspeaker 4, brass section:
Rotation, loudspeaker 1, brass section:
Rotation, loudspeaker 4, brass section:
Static, loudspeaker 1, speech:
Static, loudspeaker 4, speech:
Rotation, loudspeaker 1, speech:
Rotation, loudspeaker 4, speech:
Occluding furniture objects between loudspeaker 2 and the microphone array (measurement #212)
Static, loudspeaker 1, trumpet:
Static, loudspeaker 2, trumpet:
Static, loudspeaker 4, trumpet:
Rotation, loudspeaker 1, trumpet:
Rotation, loudspeaker 2, trumpet:
Rotation, loudspeaker 4, trumpet:
Static, loudspeaker 1, brass section:
Static, loudspeaker 2, brass section:
Static, loudspeaker 4, brass section:
Rotation, loudspeaker 1, brass section:
Rotation, loudspeaker 2, brass section:
Rotation, loudspeaker 4, brass section:
Static, loudspeaker 1, speech:
Static, loudspeaker 2, speech:
Static, loudspeaker 4, speech:
Rotation, loudspeaker 1, speech:
Rotation, loudspeaker 2, speech:
Rotation, loudspeaker 4, speech:
Equal distribution of absorptive material (measurement #166)
Static, loudspeaker 1, trumpet:
Static, loudspeaker 4, trumpet:
Rotation, loudspeaker 1, trumpet:
Rotation, loudspeaker 4, trumpet:
Static, loudspeaker 1, brass section:
Static, loudspeaker 4, brass section:
Rotation, loudspeaker 1, brass section:
Rotation, loudspeaker 4, brass section:
Static, loudspeaker 1, speech:
Static, loudspeaker 4, speech:
Rotation, loudspeaker 1, speech:
Rotation, loudspeaker 4, speech:
Unequal distribution of absorptive material (measurement #171)
Static, loudspeaker 1, trumpet:
Static, loudspeaker 4, trumpet:
Rotation, loudspeaker 1, trumpet:
Rotation, loudspeaker 4, trumpet:
Static, loudspeaker 1, brass section:
Static, loudspeaker 4, brass section:
Rotation, loudspeaker 1, brass section:
Rotation, loudspeaker 4, brass section:
Static, loudspeaker 1, speech:
Static, loudspeaker 4, speech:
Rotation, loudspeaker 1, speech:
Rotation, loudspeaker 4, speech:
Double-slope decay (measurement #178)
Static, loudspeaker 1, trumpet:
Static, loudspeaker 4, trumpet:
Rotation, loudspeaker 1, trumpet:
Rotation, loudspeaker 4, trumpet:
Static, loudspeaker 1, brass section:
Static, loudspeaker 4, brass section:
Rotation, loudspeaker 1, brass section:
Rotation, loudspeaker 4, brass section:
Static, loudspeaker 1, speech:
Static, loudspeaker 4, speech:
Rotation, loudspeaker 1, speech:
Rotation, loudspeaker 4, speech: