CONF Asaei_SAPA-SCALE_2012/IDIAP Structured Sparse Coding for Microphone Array Location Calibration Asaei, Afsaneh Raj, Bhiksha Bourlard, Hervé Cevher, Volkan Microphone array calibration Model-based sparse recovery sparse coding Speech spectral structures EXTERNAL http://publications.idiap.ch/attachments/papers/2013/Asaei_SAPA-SCALE_2012.pdf PUBLIC SAPA-SCALE Conference, The 5th ISCA workshop on statistical and perceptual audition 2012 We address the problem of microphone location calibration from a sparse coding perspective where the sensor positions are approximated over a discretized grid. We characterize the microphone signals as a sparse vector represented over a codebook of multi-channel signals where the support of the representation encodes the microphone locations. The codebook is constructed of multi-channel signals obtained by inverse filtering the acoustic channel and projecting the signals onto a array manifold matrix of the hypothesized geometries. This framework requires that the position of a speaker or the track of its movement to be known without any further assumption about the source signal. The sparse position encoding vector is approximated by model-based sparse recovery algorithm exploiting the block-dependency structure underlying the broadband speech spectrum. The experiments conducted on real data recordings demonstrate the effectiveness of the proposed approach and the importance of the joint sparsity models in multi-channel speech processing tasks.