This paper presents an alternative approach to acoustic source
localization which modifies the traditional two-step localization
procedure to not require explicit time-delay estimates. Instead,
the cross-correlation functions derived from various microphone
pairs are simultaneously maximized over a set of potential delay
combinations consistent with candidate source locations. The
result is a procedure that combines the advantages offered by the
PHAT weighting (or any reasonable cross-correlation type function)
and a more robust localization procedure without dramatically
increasing computational load. Simulations are performed across a
range of reverberation conditions to illustrate the utility of the
proposed method relative to conventional GCC filtering approaches
and a more modern eigenvalue-based technique.
