AES Journal Forum

Filter Design Method for Loudspeaker Equalization Based on IIR Parametric Filters

Document Thumbnail

A novel method for the equalization of loudspeakers and other audio systems using IIR (infinite impulse response) parametric filters is presented. The main characteristic of the proposed filter design method resides in the fact that the equalization structure is planned from the beginning as a chain of SOSs (second-order sections), where each SOS is a low-pass, high-pass, or peak filter, defined by its parameters. The algorithm combines a direct search method with a heuristic parametric optimization process where constraints on the values could be imposed in order to obtain practical implementations. A psychoacoustic model based on the detection of peaks and dips in the frequency response has been employed to determine which ones need to be equalized, reducing the filter order without noticeable effect. The first computed sections of the designed filter are the ones that correct the response more effectively, allowing scalable solutions when hardware limitations exist or different degrees of correction are needed. The method has been validated with subjective testing and compared with other methods. Its results could be applied to passive and multiway active loudspeakers.

JAES Volume 54 Issue 12 pp. 1162-1178; December 2006
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