This paper proposes an efficient method to estimate the 3D directivity pattern of loudspeakers or portable devices with embedded speakers. We place the loudspeaker on a horizontal turntable and use a first order microphone located on the horizontal plane to measure pressure and pressure gradients along three orthogonal directions to construct equivalent virtual arrays of first order microphones on the horizontal plane. By exploiting the properties of the associated Legendre functions, we construct the 3D directivity pattern of the loudspeaker over frequencies. The method is equivalent to having a measurement setup consist of a dense spherical array encompassing the loudspeaker. The underlying theory and method are corroborated by simulations as well as measurements of the directivity of a physical loudspeaker.

Authors: Birnie, Lachlan; Abhayapala, Thushara; Samarasinghe, Prasanga
Affiliations: Australian National University, Canberra, Australia; Australian National University, Canberra, ACT, Australia(See document for exact affiliation information.)
AES Convention: 143 (October 2017) Paper Number: 9872
Publication Date: October 8, 2017
Subject: Transducers

Click to purchase paper as a non-member or you can login as an AES member to see more options.

No AES members have commented on this paper yet.

Subscribe to this discussion

To be notified of new comments on this paper you can subscribe to this RSS feed. Forum users should login to see additional options.

Start a discussion!

If you would like to start a discussion about this paper and are an AES member then you can login here:
Username:
Password:

If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.