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The relation between speech segment selectivity and source localization accuracy

An experimental analysis of the relation between speech signal segment power and the source direction-of-arrival-estimation accuracy is conducted. A total of 10 different speakers, including both male and female speakers, totaling to approximately 2 hours of speech are used to analyze the performance of the Phase Transform, the Maximum Likelihood, and the Unfiltered Cross Correlation time-delay estimation techniques. For female speakers, it is determined that the Phase Transform technique has a lower percentage of anomalies and a lower direction-of-arrival root mean-square error (DOA RMSE). Conversely, for male speakers, it is determined that the Unfiltered Cross Correlation has a lower percentage of anomalies although the Phase Transform has a lower DOA RMSE. The spatial distribution of the errors as well as the speech segment power relation to the errors are also presented.