Sound-source directivity dataset for four loudspekaers

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.

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).