The realization of non-directional linear electroacoustic arrays using Bessel weighting has been described in the literature. In this paper, we discuss generalized allpass arrays; since the far-field response of a uniformly spaced linear array is specified by a mapping of the DTFT of the array weights, any FIR approximation of an allpass filter gives weights which result in a nearly uniform array response as achieved by Bessel arrays. We explain the fundamental array theory and present a straightforward method for the design of arbitrary-order allpass arrays. We then discuss applications of allpass arrays in crossover-filtered configurations and in the implementation of efficient frequency-invariant beamformers.
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.