Browsing by Subject "DSP"
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Item Open Access Design and implementation of a dsp based controller for brushless dc motors(Bilkent University, 1996) Ergün, ArmağanThis work presents development of a high speed digital signal processor based controller for Brushless DC Motors. A working model of the plant as motor and amplifier is introduced and verified through experiment. Design and implementation of the hardware using wire-wrap board is accomplished and a PID control algorithm is developed. A user interface is designed for easy performance testing of the control system.Item Open Access Three-dimensional video coding on mobile platforms(Bilkent University, 2009) Bal, CanWith the evolution of the wireless communication technologies and the multimedia capabilities of the mobile phones, it is expected that three-dimensional (3D) video technologies will soon get adapted to the mobile phones. This raises the problem of choosing the best 3D video representation and the most efficient coding method for the selected representation for mobile platforms. Since the latest 2D video coding standard, H.264/MPEG-4 AVC, provides better coding efficiency over its predecessors, coding methods of the most common 3D video representations are based on this standard. Among the most common 3D video representations, there are multi-view video, video plus depth, multi-view video plus depth and layered depth video. For using on mobile platforms, we selected the conventional stereo video (CSV), which is a special case of multi-view video, since it is the simplest among the available representations. To determine the best coding method for CSV, we compared the simulcast coding, multi-view coding (MVC) and mixed-resolution stereoscopic coding (MRSC) without inter-view prediction, with subjective tests using simple coding schemes. From these tests, MVC is found to provide the best visual quality for the testbed we used, but MRSC without inter-view prediction still came out to be promising for some of the test sequences and especially for low bit rates. Then we adapted the Joint Video Team’s reference multi-view decoder to run on ZOOMTM OMAP34xTM Mobile Development Kit (MDK). The first decoding performance tests on the MDK resulted with around four stereo frames per second with frame resolutions of 640×352. To further improve the performance, the decoder software is profiled and the most demanding algorithms are ported to run on the embedded DSP core. Tests resulted with performance gains ranging from 25% to 60% on the DSP core. However, due to the design of the hardware platform and the structure of the reference decoder, the time spent for the communication link between the main processing unit and the DSP core is found to be high, leaving the performance gains insignificant. For this reason, it is concluded that the reference decoder should be restructured to use this communication link as infrequently as possible in order to achieve overall performance gains by using the DSP core.Item Open Access The transformation of western European social democracy and its reflections on Turkish center-left(Bilkent University, 1999) Evcan, SinanThis master’s thesis is a general overview of the practical and ideological implications of the post-1980 transformation of Western European social democratic parties with specific reference to Britain, Germany and Sweden and the reflections of this transformation on Turkish center-left parties. Within this framework, the roots and developmental trend of Western European Social Democracy have been narrated throughout the first chapter of this study to clarify which social democratic principles and policies have changed during the most recent transformation of these parties. In the following chapters, which concentrate on the post-1980 period, the reasons for the electoral erosion of the Northwestern European social democratic parties during the 1980’s and the way they transformed themselves during the 1990’s to stop the decline have been analysed with reference to societal and economic changes on the one hand and to the strategical and structural changes of the parties on the other. The implications of these changes in terms of the shift in the equality principle and the changing function of pragmatism have been highlighted to draw a main profile of the social democratic transformation often referred to as the “Third Way”. The last part of my study focuses on the common and divergent patterns of the Turkish and Western European center-left, both past and present, and compares the current situation of the so-called social democratic parties in Turkey with those of Western Europe presently being conquered by a la mode Third Way currents.