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Entwicklung von Simulationssoftware zur Bestimmung der Gewichtsfunktion idealisierter Tiefpässe mit modifizierten nichtidealen Phasenspektren
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Technology & EngineeringElectrical
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ISBN10: 363863969X
ISBN13: 9783638639699
Publisher: Grin Verlag
Published: Jul 17 2007
Pages: 38
Weight: 0.14
Height: 0.09 Width: 5.83 Depth: 8.27
Language: German
ISBN13: 9783638639699
Publisher: Grin Verlag
Published: Jul 17 2007
Pages: 38
Weight: 0.14
Height: 0.09 Width: 5.83 Depth: 8.27
Language: German
Studienarbeit aus dem Jahr 2000 im Fachbereich Elektrotechnik, Note: 2,3, Hochschule Wismar (Elektrotechnik), Sprache: Deutsch, Abstract: Die gerade in der Nachrichtentechnik notwendige Filterung von Signalen erfordert eine genaue Analyse dieses Vorgangs im Zeit- und im Spektralbereich. Obwohl sich hier hauptsächlich die Dämpfungsverzerrungen durch Frequenzbandbeschränkung auf das Empfangssignal auswirken, können auch Phasenverzerrungen einen wesentlichen Einfluss darauf haben. Da die Verzerrungen Nebenechos bei der Gewichtsfunktion verursachen und damit den Einschwingvorgang verlängern, wird mit verschiedenen Methoden versucht, diese zu minimieren. So nutzt man beispielsweise Tiefpässe mit cos2-Flanken, die auftretende Überschwinger optimal dämpfen. Au erdem werden oft Netzwerke zur Phasenvorverzerrung eingesetzt, um den durch die Filter verursachten Phasenverzerrungen entgegenzuwirken. Dazu müssen aber die Auswirkungen dieser Verzerrungen genau analysiert werden. Zur Untersuchung des Einflusses verschiedener Phasenspektren auf die Gewichtsfunktion wurde deshalb ein entsprechendes HP VEE Programm entwickelt, mit dem das Systemverhalten für idealisierte Rechteck- und Trapeztiefpässe nachgebildet werden kann. Um die Zusammenhänge des Systemverhaltens im Spektral- und im Zeitbereich zu verdeutlichen, werden Amplitudengang, Phasengang, Gruppenlaufzeit und Gewichtsfunktion gleichzeitig graphisch dargestellt.
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