DOI: 10.5281/zenodo.10255555
title: Sound-source directivity dataset for four loudspekaers

description: A dataset of sound-source directivity measurements for four different sound sources that can be used in acoustic measurements. 

The loudspeakers included:



Genelec 8030B studio monitor;

Genelec 8331A studio monitor;

01 dB LS01 omnidirectional loudspeaker conforming with ISO 3382-1:2009 standard (OmniSource);

Mixed-order spherical loudspeaker type 393 (information on design of the loudspeaker is found in the publication: https://www.researchgate.net/publication/333132335_Design_and_Control_of_Mixed-Order_Spherical_Loudspeaker_Arrays). NOTE: the orientation of the drivers is specified in the table below.





Elevation (deg.)
Azimuth (deg.)
Driver #


0
0
15


0 
-40 (320)
11


0 
-80 (280)
10


0
-120 (240)
9


0
-160 (200)
8


0
40
7


0
80
6


0
120 
5


0
160
4


-45
120
13


-45
0
12


-45
-120 (240)
14


45
-60 (300)
2


45
60
1


45
180
3




 

The directivity was measured in the anechoic chamber Lampio at the Acoustics Lab of Aalto University in Espoo, Finland.

The measurement microphones were  G.R.A.S. 46AF 1/2" free-field microphones and B&K 4191 1/2" free-field microphone. All the receivers were fixed on a custom-made measurement arc. The sound sources were placed ona turntable allowing for high angular resolution in the XY-plane.

More information about the measurements is available in the paper: Anthony Gallien, Karolina Prawda, and Sebastian J. Schlecht, "Matching early reflections of simulated and measured RIRs by applying sound-source directivity filters", in Proc. AES ASR 2024, 22-26 Jan. 2024, Le Mans, France

Directivity plots for all sound sources are available online: http://research.spa.aalto.fi/publications/papers/aes-asr24-recreate-RIRs/ 

The work leading to producing the dataset and related research was conducted as Anthony Gallien's intership project at Aalto University Acoustics Lab from May 22 -- August 18, 2023.

 

How to read this dataset:

The measurements of each sound-source are available as a Spatially Oriented Format for Acoustics (SOFA), AES69-2015 file or as a set of individual directivity measurements in .wav format included in a .zip file with the name of a respective sound source. 

The naming convention for Genelec studio loudspeakers and 01 dB omnidirectional loudspeaker is:

Calibrated_IR_elevation_E_azimuth_A.wav

The naming convention for the mixed-order loudspeaker is:

Calibrated_IR_elevation_E_azimuth_A_driver_D.wav

NOTE that directivity measurements for mixed-order loudspeaker and elevation above 0 degrees are missing due to a loudspeaker-related technical issue during the measurement!

 

The azimuth and elevation angles are determined according to the scheme presented in the file azimuth_elevation.pdf.

Where elevation is relative to XY-plane at the horizontal axis of the sound source and azimuth is relative to the vertical plane at the vertical axis of the loudspekaer. 

The elevation angles range from -80 degrees to 90 degrees in 10-degree steps. The azimuth angles range from 0 degrees to 359 degrees in 1-degree steps for Genelec loudspekers and omnidirectional sound source, and in 5-degree steps for the mixed-order loudspeakers. The azimuth angles increase clockwise relative to the axis of the loudspeaker (1 degree azimuth means 1 degree right of the loudspeaker axis, 359 degree azimuth means 1 degree left of the loudspeaker axis).

 

The datset includes a total of 38 880 measurements (6 480 measurements for omnidirectional source and each of the Genelec loudspeakers, 19 440 measurements for the mixed-order loudspeaker).