Browsing by Subject "faktoryzacja"

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Algorytm faktoryzacji z wykorzystaniem krzywych eliptycznych
(Data obrony: 2019-07-05) Piątkowski, Mateusz
Wydział Matematyki Stosowanej
Access status: Restricted ,
Faktoryzacja - opis wybranych algorytmów i ich zastosowania
(Data obrony: 2019-07-05) Widuch, Justyna
Wydział Matematyki Stosowanej
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Kolorowanie krawędziowe hipergrafów
(Data obrony: 2020-10-29) Kotrys, Kamila
Wydział Matematyki Stosowanej
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Kwantowa transformata Fouriera i jej zastosowania
(Data obrony: 2010-06-08) Ciechanowski, Marcin
Wydział Matematyki Stosowanej
Access status: Open Access ,
Multi-channel virtual-microphone feedback minimum-variance active noise control system
(Wydawnictwa AGH, 2009) Pawełczyk, Marek
Classical active noise control systems are designed to minimise, in a sense, the residual signal at the microphone providing information about acoustic noise and secondary sound interference. The secondary sound operates at the same time on the acoustic noise at other positions including user ears. In the worst case this can result in sound reinforcement at those positions. In many applications placing another microphone directly at the ears is not accepted. It is then justified to make efforts to design a dedicated system. The purpose is to minimise the mean-square value of the noise at the desired location while performing measurements of sound interference results at another location. This can be done by employing the general idea of Vrtual-Microphone Control systems. However, for many active noise control applications the use of a single pair of microphone and loudspeaker does not suffice to obtain satisfactory performance, i.e. generate a zone of quiet of acceptable dimensions. Moreover, for some applications, presence of an obstacle, e.g. the head in an active headrest system, constitutes a barrier for the zone of quiet at one side to propagate to the other side. Therefore, more microphones and loudspeakers are often necessary. In the most general case a coupling between subsequent pairs should be taken into account resulting in a multi-channel system. In previous papers of the author adaptive systems have been designed and analysed. In this paper a fixed parameter multi-channel Virtual-Microphone Control system, optimal in the mean- square sense, is designed. It includes non-minimum phase property of the system channels. Both the case of more inputs than outputs as well as the case of more outputs than inputs are considered. Factorization techniques have been used for the design. The system is verified by successfully controlling noise for the active headrest system.
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Ocena niezawodności układów sieciowych metodą faktoryzacji
(Data obrony: 2011-07-20) Sułek, Piotr
Wydział Inżynierii Mechanicznej i Robotyki