TY - CONF AB - Microphone arrays represent the basis for many challenging acoustic sensing tasks. The accuracy of techniques like beamforming directly depends on a precise knowledge of the relative positions of the sensors used. Unfortunately, for certain use cases manually measuring the geometry of an array is not feasible due to practical constraints. In this paper we present an approach to unsupervised shape calibration of microphone array networks. We developed a hierarchical procedure that first performs local shape calibration based on coherence analysis and then employs SRP-PHAT in a network calibration method. Practical experiments demonstrate the effectiveness of our approach especially for highly reverberant acoustic environments. AU - Hennecke, Marius AU - Ploetz, Thomas AU - Fink, Gernot A. AU - Schmalenstroeer, Joerg AU - Haeb-Umbach, Reinhold ID - 11806 KW - acoustic sensing tasks KW - array geometry KW - calibration KW - coherence analysis KW - hierarchical procedure KW - local shape calibration KW - microphone array networks KW - microphone arrays KW - network calibration method KW - sensor arrays KW - SRP-PHAT KW - unsupervised shape calibration T2 - IEEE/SP 15th Workshop on Statistical Signal Processing (SSP 2009) TI - A hierarchical approach to unsupervised shape calibration of microphone array networks ER -