Francesca Ortolani

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Interference in three-dimensional audio systems is a problematic issue. Eliminating noise, or any other disturbing source, without affecting the spatial audio rendering, is challenging, indeed. Using the least possible number of microphone capsules and reduced size is another issue. An elementary way for accomplishing this job makes use of a 3D audio(More)
Adaptive filtering can be expanded to new numerical systems and unseen sides of physical problems can be highlighted thanks to the mathematical properties of such hypercomplex algebras. Each algebra has its own rules and operation results may not be compatible from one algebra to another. However, such peculiarities diversify algebras in a way that each of(More)
3-dimensional (3D) audio is the new frontier in audio technology and it is quickly taking place in many applications, from cinema to virtual reality, audio surveillance and video games. The large amount of data requires fast and compact solutions for signal processing. With this aim in view, research is moving towards the exploration of hypercomplex(More)
During the recent years, signal processing research started investigating hypercomplex numbers and their usefulness in the modeling of systems. Together, digital signal processing groups started developing multidimensional algorithms in the hypercomplex domains. At present, many proposals include quaternion, octonion and Lie algebra solutions. However, a(More)
In this paper we propose an algorithm which operates weight adaptation by means of a periodic law and is based on the Widely Linear Quaternion Least Mean Square (WL-QLMS) algorithm. The WL-QLMS successfully handles real-world signals, either proper or improper. However, because of the introduction of full second order statistics into the algorithm, its(More)
The performance of hypercomplex adaptive filters has been widely experimented during the last decade. Quaternion filters, especially, have been utilized in systems where the signals to be processed have some form of correlation. However, besides correlation, some resolved explanation about what particular algebra to use in a certain context has not been(More)
The Memristor is considered as the fourth fundamental element besides the resistor, the capacitor and the inductor. When Leon Chua first introduced this element, it was just a theoretical idea. Today, after 30 years from Chua's first paper about it, it is possible to buy memristor devices. In this paper, we investigate a way to exploit memristors in a(More)
Coincident microphone array techniques are usually employed in 3-dimensional (3D) audio entertainment applications, like cinema sound, music, video games, but in other scenarios, like target localization, air and underwater warfare (where acoustics and hydrophones promptly support radio systems) their usage was investigated far too little. In RADAR theory,(More)
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