ARTICLE Taghizadeh_SIGPRO_2014/IDIAP Enhanced Diffuse Field Model for Ad Hoc Microphone Array Calibration Taghizadeh, Mohammad J. Garner, Philip N. Bourlard, Hervé Ad hoc microphone array calibration Adequacy of diffuseness Diffuse field coherence model EXTERNAL http://publications.idiap.ch/attachments/papers/2014/Taghizadeh_SIGPRO_2014.pdf PUBLIC Signal Processing 101 242-255 0165-1684 2014 In this paper, we investigate the diffuse field coherence model for microphone array pairwise distance estimation. We study the fundamental constraints and assumptions underlying this approach and propose evaluation methodologies to measure the adequacy of diffuseness for microphone array calibration. In addition, an enhanced scheme based on coherence averaging and histogramming, is presented to improve the robustness and performance of the pairwise distance estimation approach. The proposed theories and algorithms are evaluated on simulated and real data recordings for calibration of microphone array geometry in an ad hoc set-up.