  This paper introduces SMP-PHAT, which performs direction of arrival (DoA) of
sound estimation with a microphone array by merging pairs of microphones that
are parallel in space. This approach reduces the number of pairwise
cross-correlation computations, and brings down the number of flops and memory
lookups when searching for DoA. Experiments on low-cost hardware with commonly
used microphone arrays show that the proposed method provides the same accuracy
as the former SRP-PHAT approach, while reducing the computational load by 39%
in some cases.
