Twoto three-channel audio upmix can be useful in a number of contexts. Adding a front center loudspeaker provides a more stable center image and an increase in dialogue clarity. Even in the absence of a physical center speaker, the ability to derive a center channel can facilitate speech enhancement by making it possible to boost or filter the dialogue, which is usually panned to the center. Tw...

Variations in illumination is a well-known affecting factor on face recognition system performance. Features extraction is one of the principal steps on a face recognition framework, where it is possible to alleviate the illumination effects on face images. The aim of this work is to study the illumination invariant properties of an hypercomplex image representation. A quaternion description fr...

Four different applications of spectral proper orthogonal decomposition (SPOD): low-rank reconstruction, denoising, frequency-time analysis, and prewhitening are demonstrated on large-eddy simulation data a turbulent jet. SPOD-based reconstruction can be performed by direct inversion truncated SPOD. This problem, however, is ambiguous since SPOD relies estimation. We demonstrate flow field usin...

Driven by the need to reduce the installation cost and maintenance cost of structural health monitoring (SHM) systems, wireless sensor networks (WSNs) are becoming increasingly popular. Perfect time synchronization amongst the wireless sensors is a key factor enabling the use of low-cost, low-power WSNs for structural health monitoring applications based on output-only modal analysis of structu...

AbstmctMulticarrier systems of the OFDM-type perform a frequency domain decomposition of a channel characterized by frequency selective distortion in a multitude of subchannels that are affected by frequency flat distortion. The distortion in each independent subchannel can then be compensated by simple gain and phase adjustements, somehow overcoming the need of one of the most complex componen...

purpose: comparison of the results of visual evoked potential (vep) in time domain and frequency domain between multiple sclerosis (ms) suspected patients and normal indivisuals. method: eleven ms suspected patients with normal visual findings and 20 normal individuals were tested by vep. results were compared between two groups. results: the time domain results showed no significant difference...