AES Journal Forum

Estimation of Loudspeaker Frequency Response and Directivity Using the Radiation-Mode Method

Document Thumbnail

Although the acoustic radiation of common loudspeaker systems can be easily measured using modern measurement techniques, the process requires free-field conditions that may be difficult to satisfy. Large anechoic rooms are very expensive and outdoor measurements are subject to uncontrollable weather conditions. This paper proposes the use of the radiation mode (RM) method to estimate the frequency response and directivity pattern of loudspeaker systems. The underlying theory and method principle are first described and then assessed in both an anechoic room and large non-anechoic hall by measuring four loudspeaker systems with different radiation patterns. Results show a satisfactory level of accuracy for the proposed method across all sources tested and both measurement rooms, especially when considering the reduced number of measurement points needed. These examples are then complemented with a preliminary parametric study based on the simulation of a tall system, namely a line array for which standard measurement techniques are not applicable. More specifically, the influences of identification point locations, noise, and RM series truncation are all investigated. The output of these simulations illustrates the potential of this method to characterize sound sources that cannot be measured using classical means.

JAES Volume 67 Issue 3 pp. 101-115; March 2019
Publication Date:

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

RSS Feed 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:

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.

AES - Audio Engineering Society