03. Lisensiaatin tutkinnon opinnäytteet / Licentiate theses
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Browsing 03. Lisensiaatin tutkinnon opinnäytteet / Licentiate theses by Degree programme/Major subject "Akustiikka ja äänenkäsittelytekniikka"
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Item The Adaptive Line Enhancer Applied to Carrier Phase Jitter Compensation in High-speed Voiceband Modems(1992) Koljonen, Jouni; Kari, Risto; Sähkötekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Karjalainen, MattiItem An agent-based method for self-study interactive web-based education(Teknillinen korkeakoulu, 2006) Rahkila, Martti; Karjalainen, Matti; Prof.; Department of Electrical and Communications Engineering; Sähkö- ja tietoliikennetekniikan osasto; Karjalainen, Matti; Prof.This thesis deals with computer-based education of acoustics and digital signal processing. The focus throughout the thesis is on interactive, self-study web-based applications even though many issues are of more general nature as well. The emphasis is especially on describing interactivity while using educational applications and the use of log information for evaluation of learning. The goal for the thesis has been to develop a web-based solution for audio signal processing education with emphasis on advanced, intelligent interactivity. The basis for this interactivity is the double agent architecture for web applications. The architecture allows the control of the interaction process by means of logs and using them as a basis for content adaptation. Furthermore, the novelty of this method is its applicability to evaluation of learning. The log information, provided by the architecture, can be used for on-line evaluation of users' requests and thus provides means for content adaptation. Furthermore, the log information can also be post-processed and used for off-line evaluation of the learning process by both teachers as well as students themselves. The latter has also pedagogical importance supporting the development of self-reflection and metacognitive skills.Item Audio coding with warped predictive methods(1998) Härmä, Aki; Laine, Unto K.; Sähkö- ja tietoliikennetekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Karjalainen, MattiItem Autoregressiivisen mallin soveltaminen merivälkesignaalin analyysissa(2000) Käyhkö, Kimmo; Sähkö- ja tietoliikennetekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Alku, PaavoItem Fractional Delay Waveguide Modeling of Acoustic Tubes(1994) Välimäki, Vesa; Sähkötekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Karjalainen, MattiItem Graafinen käyttöliittymäohjelmisto digitaalista signaalinkäsittelyjärjestelmää varten(1993) Helle, Seppo; Karjalainen, Matti; Sähkötekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Karjalainen, MattiItem Measurements of bending wave propagation by vibrational intensity technique(1990) Linjama, Jukka; Karjalainen, Matti; Sähkötekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Karjalainen, MattiItem Methods of automatic audio content classification(Teknillinen korkeakoulu, 2007) Pohjalainen, Jouni; Kurimo, Mikko;; Department of Electrical and Communications Engineering; Sähkö- ja tietoliikennetekniikan osasto; Laine, Unto K.; Prof.This study presents an overview of different methods of digital signal processing and pattern recognition that are frequently applicable to automatic recognition, classification and description of audio content. Moreover, strategies for the combination of the said methods are discussed. Some of the published practical applications from different areas are cited to illustrate the use of the basic methods and the combined recognition strategies. A brief overview of human auditory perception is also given, with emphasis on the aspects that are important for audio recognition.Item Modeling of Human Spatial Hearing in the Context of Digital Audio and Virtual Environments(1997) Huopaniemi, Jyri; Sähkö- ja tietoliikennetekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Karjalainen, MattiItem Multichannel multiprocessor system for real-time audio applications(1998) Huotilainen, Tommi; Simula, Olli; Sähkö- ja tietoliikennetekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Karjalainen, MattiItem Multiple-Resolution Analysis of Speech Signals(1989) Altosaar, Toomas; Sähkötekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Karjalainen, MattiItem Nonlinear Modeling Techniques for Plucked String Instruments(1999) Tolonen, Tero; Sähkö- ja tietoliikennetekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Karjalainen, MattiItem Properties of Acoustic Energy Quantities(1989) Uosukainen, Seppo; Sähkötekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Karjalainen, MattiItem Psychoacoustical Considerations in Speech Analysis and Recognition(1995) Boda, Peter Pal; Sähkötekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Karjalainen, MattiItem Short-Time power spectra Estimations and acoustical applications(1983) Lahti, Tapio; Sähkötekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Lampio, EeroItem Signal processing platform for multi-service networks(2000) Suvanen, Jyri; Lehtimäki, Matti; Sähkö- ja tietoliikennetekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Alku, PaavoItem Simulation of the acoustic behavior of an axial-flux permanent-magnet machine(2014) Simbierowicz, Gabriela; Keskinen, Eero; Signaalinkäsittelyn ja akustiikan laitos; Sähkötekniikan korkeakoulu; Välimäki, VesaThis study investigates the vibro-acoustic phenomena of an axial-flux permanent magnet machine, used as hoisting equipment for low and middle rise elevators. The primary aim of this work is to develop a method that can be used in the elevator industry, for understanding and influencing the factors affecting the acoustic behaviour of the machine. For this purpose, a multiphysics finite element model was built, coupling the electromagnetic, mechanical and acoustic environments created by the electrical machine. The first part of this thesis investigates the noise sources inside an elevator shaft. After a literature survey of the noise sources of electrical machines, the noise pressure in the elevator shaft was measured and evaluated based on the frequency content of the data. As a result, the study concentrated on the noise created by the active parts of the motor. The second part is focused on the governing equations for the electromagnetic and vibro-acoustic phenomena; solved by using the finite element method. The third part presents a model built for an axial-flux permanent-magnet machine, with the focus on the features and validation methods for the vibro-acoustic phenomena. The output of the model describes the acoustic response of the motor for different elevator speeds. The last part contains the most important findings of the work including the following: 1) the axial component of electromagnetic excitation has a dominant effect on noise emission, for the studied machine, in comparison with the tangential component; 2) the impact of mechanical resonances on the noise is substantial, even for very low electromagnetic excitations; 3) by reshaping the geometry of the machine, the eigenmode shapes can be altered and significant noise reduction can be achieved.Item State Classes - an Object-Oriented Approach to Dynamic Modelling(1993) Ran, Alexander S.; Karjalainen, Matti; Sähkötekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Karjalainen, MattiItem Yleistetty parametrien suhteen lineaarinen mallirakenne ja signaalinkäsittely(2000) Paatero, Tuomas; Karjalainen, Matti; Sähkö- ja tietoliikennetekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Karjalainen, Matti
