Dissemination

Marie Curie

SUBRIR database

Data available for download, but currently protected by password (to be removed after publication of the report cited below)
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description

The Subwoofer Room Impulse Response (SUBRIR) database is a collection of acoustic measurements performed in an unoccupied, standard domestic listening room at Bang & Olufsen headquarters in Struer (Denmark) using a subwoofer as the sound source. Two subwoofers with different characteristics and two types of omnidirectional microphones were used to measure the RIR at different locations, for a total of 96 measurements.

The objective of this database is to provide a set of reliable RIRs at very low frequency, even below the frequency region of modal resonances, and it is expected to find application in the validation of acoustic signal enhancement algorithms intended for music reproduction.

When using any portion of this data set, please cite:

G. Vairetti, N. Kaplanis, E. De Sena, S. H. Jensen, S. Bech, M. Moonen, and T. van Waterschoot, “The subwoofer room impulse response database (SUBRIR),” KU Leuven, Tech. Rep., 2016.

 

measurements

RIR measurements were obtained using the exponential sine-sweep technique using  5 s sine sweeps (0.1 Hz-24 KHz)  with a sampling rate of 48 kHz, in conformity with the guidelines in ISO 3382-1,2 for precision measurements.

Measurements were performed using two different subwoofers and two different microphones at 6 different microphone positions (see Table II) and 4 different subwoofer positions (see Table III). In total, the database consists of 4 sets of 24 RIRs each (96 RIRs in total). 

Additional measurements:

  • Near Field is a measurement as close as possible to the driver, at subwoofer position 4.
  • Calibration contains an on axis measurement at 0.5cm at centre of the room. (driver position)

 

room description

When furnished, the room complies with IEC 60268-13 with RT(500 Hz−1 KHz) = 0.35 s. The room comprises of wooden floor, wooden false ceiling filled with Rockwool®, and lightly plastered painted walls with high-frequency absorbing panels on the side walls.

During the measurements, the room was emptied, except for 16 acoustic wooden panels (0.5×0.5×0.025 m) and 2 Helmholtz absorbers tuned at 200-300 Hz. The room is sketched in the figure below. The room dimensions and the values of the reverberation time are given in Table I.

 BeoRoom2

Table I: Room specifications

Dimensions 4.09 L x 6.35 W x 2.40 H (m)
Volume 62.3 m3

 

source-microphone positions

Table II: Microphone positions (in m)

 Mic X Y Z
 1 1.120 1.560 1.500
 2 0.770 4.040 1.800
 3 2.040 2.474 0.900
4 1.620 5.320 0.600
5 3.050 3.064 1.500
6 3.090 5.072 1.000
 

Table III: Subwoofer positions (in m)

Speaker X Y Z
1 3.843 3.840 0.530
2 2.907 0.809 0.530
3 3.629 5.835 0.530
4 2.354 4.551 1.130

 

equipment

subwoofers: 

A) custom Genelec 1094A subwoofer (15-120 Hz, ±3 dB)

B) Genelec 7050 subwoofer (25-120 Hz ±3 dB)

microphones: 

C) 1/4” 4939 B&K

D) 1/2” 4133 B&K

preamplifier:

B&K 2669

amplifier:

NEXUS B&K

audio interface:

RME UCX

 

reverberation time (sub A, mic D)

Frequency-dependent values of the reverberation time are computed using a cosine-modulated filterbank and an approximation of the RIRs using orthonormal basis function models in order to reduce problems related to low signal-to-noise ratio and to the influence of the band-pass filters of the filterbank (see report for more details).

RevTime

 

data and file format

Room impulse responses and recorded raw signals are provided in a MATLAB .mat file, which also contains useful information about the measurements (e.g.. estimated reverberation time, acoustic delays, etc.). More details are provided in a README file included in each .zip file (see links below for download). Each .zip file also contain a script useful for the processing and the analysis of the measurements (see README text file for details).

 

download

ready-to-use post-processed RIRs

subwoofer B, microphone D: SUBRIR_SpB_MicD_RIRs  (44 MB)

full databases (recorded signals (RAWs), post-processed RIRs, ESS and inverse signals)

subwoofer A, microphone C: SUBRIR_SpA_MicC  (540 MB)

subwoofer A, microphone D: SUBRIR_SpA_MicD  (520 MB)

subwoofer B, microphone C: SUBRIR_SpB_MicC  (538 MB)

subwoofer B, microphone D: SUBRIR_SpB_MicD  (515 MB)

other measurements

Near Field measurement (subwoofer A): SUBRIR_NF_SpA  (14 MB)

Calibration measurements: SUBRIR_Calibration (11 MB)

 

 NOTE: the data are currently protected by password (to be removed after publication of the report cited above)

contact: This email address is being protected from spambots. You need JavaScript enabled to view it.

 

credits and disclaimer

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The Subwoofer Room Impulse Response database (SUBRIR)   

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(c) 2016 KU LEUVEN - BANG & OLUFSEN A/S - AALBORG UNIVERSITY        

FP7-PEOPLE Marie Curie Initial Training Network 'Dereverberation and Reverberation of Audio, Music, and Speech (DREAMS)', funded by the European Commission under Grant Agreement no. 316969        

http://www.dreams-itn.eu/

Giacomo Vairetti, This email address is being protected from spambots. You need JavaScript enabled to view it.

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