Enhanced Sound Localization
Bob Mungamuru, Parham Aarabi, Member, IEEE
February 9, 2004 DRAFT
A new approach to sound localization, known as Enhanced Sound Localization, is introduced, o#ering two major
benefits over stateoftheart algorithms. First, higher localization accuracy can be achieved compared to existing methods.
Second, an estimate of the source orientation is obtained jointly, as a consequence of the proposed sound localization
technique. The orientation estimates and improved localizations are a result of explicitly modeling the various factors that
a#ect a microphone's level of access to di#erent spatial positions and orientations in an acoustic environment. Three primary
factors are accounted for, namely the source directivity, microphone directivity and sourcemicrophone distances.
Using this model of the acoustic environment, several di#erent Enhanced Sound Localization algorithms are derived.
Experiments are carried out in a real environment whose reverberation time is 0.1 seconds, with the average microphone
SNR ranging between 1020 dB. Using a 24element microphone array, a weighted version of the SRPPHAT algorithm is
found to give an average localization error of 13.7cm with 3.7% anomalies, compared to 14.7cm and 7.8% anomalies with
the standard SRPPHAT technique.
Facilitated by the staggering increase in the availability of computational power over the last two