The ability to accurately manipulate the spectral content of audio is indispensable for the artistic presentation of sound. While there are many devices currently available that are capable of performing this function, most tend to be either highly complex electrical engineering tools, or music-oriented products that are limited in functionality. Filter Designer was created to fill this gap by providing an environment with which musically-trained users can design and implement digital filters, while having access to control parameters and analysis data previously exclusive to the engineering field. This work explores the factors that motivated the creation of Filter Designer, and examines the process of its development, from basic user interface design to the calculation and implementation of digital filters for use with audio signals.

Filters constitute an essential tool for manipulating the spectral content of a signal. While there is a plethora of filtering tools, both in the hardware and software domain, the majority of them are geared towards engineers and scientists, rather than sound designers and electroacoustic composers. The "common-practice" approach is to consider filters as post-production tools. This can be restrictive if filters are to be used as artistic tools, dynamically involved in the shaping of the sound. This thesis was written with this approach in mind its aim is (a) to provide a survey of the various digital recursive filters, enabling a filter designer to choose the one that suits his needs, (b) to teach filter designers, such as electroacoustic composers and sound designers how to calculate digital filter coefficients, and (c) implement filter algorithms using the familiar syntax of computer music languages such as Csound and SuperCollider .

Modern industrial plants make use of large numbers of variable frequency drives for a variety process controls. However, a drawback of this technology is that drives are a source of harmonic currents. This work designs and models in PSCAD, an electrical system typically encountered in modern industrial operations, where the load is composed of a large percentage of voltage-source converter drives. Attempts are made to provide mitigation by employing passive shunt harmonic filters. Following the benchmarking of these filters, a shunt active filter, whose control algorithm is based on the Instantaneous Power Theory, is connected to the system. The results obtained for the active filter are compared against results obtained for the passive filters. It will be shown that a shunt active filter is more suited solution for mitigation of harmonics generated by loads dominated by drives than passive filters.

Modern industrial plants make use of large numbers of variable frequency drives for a variety process controls. However, a drawback of this technology is that drives are a source of harmonic currents. This work designs and models in PSCAD, an electrical system typically encountered in modern industrial operations, where the load is composed of a large percentage of voltage-source converter drives. Attempts are made to provide mitigation by employing passive shunt harmonic filters. Following the benchmarking of these filters, a shunt active filter, whose control algorithm is based on the Instantaneous Power Theory, is connected to the system. The results obtained for the active filter are compared against results obtained for the passive filters. It will be shown that a shunt active filter is more suited solution for mitigation of harmonics generated by loads dominated by drives than passive filters.

No description available.

Thesis (M.S.)--Ohio University, November, 1989. / Title from PDF t.p.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1993. / Vita. Abstract. Includes bibliographical references (leaves 140-143). Also available via the Internet.

Thesis (M.S.)--University of Wisconsin--Madison, 1969. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M. Eng.)--Carleton University, 1992. / Also available in electronic format on the Internet.

Thesis (M.S.)--University of Wisconsin--Madison, 1942. / Typescript. Includes bibliographical references (leaves 74-75).