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2014 Turntable for an Automatic Acquisition System for Measuring the Directional Characteristic of Musical Instruments

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  BACHELOR THESIS University of Applied Sciences Technikum Wien, Electronic Engineering Turntable for an Automatic AcquisitionSystem for Measuring the DirectionalCharacteristic of Musical Instruments Author: Martin LahmerStudent ID: 1210254005Academic Supervisor: FH-Prof. Dipl.-Ing. Christian KollmitzerCompany Supervisor: Ing. DI (FH) Alexander MayerVienna, June 4, 2014  Declaration „I confirm that this paper is entirely my own work. All sources and quotations have been fullyacknowledged in the appropriate places with adequate footnotes and citations. Quotationshave been properly acknowledged and marked with appropriate punctuation. The worksconsulted are listed in the bibliography. This paper has not been submitted to anotherexamination panel in the same or a similar form, and has not been published.“Vienna, June 4, 2014Place, Date Signatur  Abstract Musical instruments are complex physical systems. This paper deals with the class of brasswind instruments especially the Tuba. Brass instruments are excited by the vibrating lipsof the musician and radiates the played tone at the end of the tube via the bell into theacoustic room. How the sound is radiated, is determined by individual characteristics of anmusical instrument. One of these attributes is the directivity, which will be considered ingreater detail in this work. It defines how the sound is radiated as a function of positionand frequency. For this purpose an automatic measuring system was developed which allowsstimulating a brass instrument and measuring the radiated sound pressure in different angles.So a complete sound pattern can be created. This was realized by a turntable system whichis driven by automatic controlled stepper motors.By the measurement of two different Tubas the system has been successfully tested.Thereby, useful diagrams were obtained that represent the angle-dependent sound radiationof the instruments over a number of frequency bands. This success serves as a basis forfurther acquisitions which could be done in one plane at least. The developed system con-sisting of hard- and software is simply adaptable for almost all kinds of musical instrumentsfor further purpose. Keywords:  Brass Wind Instruments, Directional Characteristic, Automated AcquisitionSystem, Step Motor driven Turntable, Arduino, LabVIEW  Kurzfassung Musikinstrumente sind komplexe physikalische Systeme. Diese Arbeit beschäftigt sich mitder Klasse der Blechblasinstrumente, speziell der Tuba. Diese werden durch die schwingendenLippen des Spielers angeregt und am Ende der Röhre wird der Ton über den Schalltrichterin den akustischen Raum abgegeben. Wie der Schall abgestrahlt wird, wird durch die in-dividuelle Charakteristik des jeweiligen Musikinstruments bestimmt. Eines dieser Attributeist deren Richtwirkung, die in dieser Arbeit genauer betrachtet wurde. Sie beschreibt, wieein Musikinstrument den Schall in Abhängigkeit von Ort und Frequenz abstrahlt. Dafürwurde ein automatisches Messsystem entwickelt, das es ermöglicht ein Blechblasinstrumentanzuregen und den abgestrahlten Schalldruck für verschiedene Winkel zu messen. Realisiertwurde dies durch ein automatisierten Drehtischsystem, das per Schrittmotoren angetriebenwird.Durch das Messen von zwei verschiedenen Tuben wurde das System erfolgreich getestet.Dabei wurden brauchbare Diagramme gewonnen, die die winkelabhängige Schallabstrahlungder Tuben über mehrere Frequenzbänder abbilden. Dieser Erfolg dient als Grundlageum weitere Musikinstrumente zumindest in einer Ebene ausmessen zu können. DasSystemkonzept von Hard- und Software wurde für weiterführende Messzwecke so ausgelegt,dass es für nahezu sämtliche Musikinstrumente angepasst werden kann. Schlagwörter:  Blechblasinstrumente, Richtcharakteristik, Automatisches Messsystem,Drehtisch mit Schrittmotor, Arduino, LabVIEW

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Jul 24, 2017
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