Browsing by Author "Firoozabadi, A. D."
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- Item3D multiple sound source localization by proposed cuboids nested microphone array in combination with adaptive wavelet-based subband GEVD(2020) Firoozabadi, A. D.; Irarrázaval Mena, Pablo; Adasme, P.; Zabala Blanco, D.; Palacios Jativa, P.; Azurdia Meza, C.
- ItemA multi-channel speech enhancement method based on subband affine projection algorithm in combination with proposed circular nested microphone array(2021) Firoozabadi, A. D.; Irarrázaval Mena, Pablo; Adasme, P.; Durney, H.; Olave, M. S.; Zabala Blanco, D.; Azurdia Meza, C.
- ItemEvaluation of localization precision by proposed quasi-spherical nested microphone array in combination with multiresolution adaptive steered response power(2020) Firoozabadi, A. D.; Irarrázaval Mena, Pablo; Adasme, P.; Zabala Blanco, D.; Azurdia Meza, C.
- ItemMultiresolution Speech Enhancement Based on Proposed Circular Nested Microphone Array in Combination with Sub-Band Affine Projection Algorithm(2020) Firoozabadi, A. D.; Irarrázaval Mena, Pablo; Adasme, P.; Zabala Blanco, D.; Durney, H.; Sanhueza, M.; Palacios Jativa, P.; Azurdia Meza, C.
- ItemSimultaneous Sound Source Localization by Proposed Cuboids Nested Microphone Array Based on Subband Generalized Eigenvalue Decomposition(2021) Firoozabadi, A. D.; Irarrázaval Mena, Pablo; Adasme, P.; Durney, H.; Olave, M. S.; Zabala-Blanco, D.; Azurdia-Meza, C.
- ItemVelocity Variability in MRI Phase-Contrast(IEEE, 2018) Firoozabadi, A. D.; Irarrázaval Mena, Pablo; Uribe Arancibia, Sergio A.; Tejos Núñez, Cristián Andrés; Sing-Long C., Carlos A.MRI phase contrast is a well known technique for computing the average velocity associated to each pixel. In this work, we calculate the exact probability distribution function for the velocity given the noise in the signal. This pdf is not necessarily Gaussian, particularly for low Signal-to-Noise ratio. We first find the pdf of the signals phase, assuming Gaussian noise in the real and imaginary channels of the signal. The pdf of the velocity is then the convolution of the phases pdfs. To confirm this, we measure several times the velocity in a flow phantom and compare the empirical histogram with the theoretical pdf. We also acquire the velocity from a volunteers aorta using a standard protocol for 4D Flow and multiple coils. Based on this noise characterization, we also propose an optimal weighing for combining multiple coils which is not based only on the coil sensitivities.