Flute acoustics: measurement, modelling and design - School of ...
Flute acoustics: measurement, modelling and design - School of ...
Flute acoustics: measurement, modelling and design - School of ...
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CHAPTER 8. SOFTWARE IMPLEMENTATION 115<br />
Table 8.1: C library files for the woodwind model. C program files (.h <strong>and</strong> .c) for each filename<br />
are provided in Appendix B.<br />
Filename<br />
Acoustics<br />
Analysis<br />
Complex<br />
Map<br />
Minima<br />
Note<br />
ParseImpedance<br />
ParseXML<br />
Point<br />
TransferMatrix<br />
Vector<br />
Woodwind<br />
Description<br />
Calculates acoustical constants, transfer matrices etc.<br />
Contains methods used by AnalyseNotes.<br />
Complex arithmetic library.<br />
Simple implementation <strong>of</strong> a map (associative array).<br />
Contains definition <strong>and</strong> methods for finding minima.<br />
Representation <strong>of</strong> a musical note, including name, tuning <strong>and</strong><br />
midi number.<br />
Parses the file returned by PlayedImpedance for use by<br />
AnalyseNotes.<br />
Parses XML representation <strong>of</strong> a woodwind, <strong>and</strong> returns a<br />
Woodwind structure.<br />
Definition <strong>of</strong> a simple structure containing (x, y) data.<br />
An implementation <strong>of</strong> a 2 × 2 matrix, <strong>and</strong> functions to multiply<br />
<strong>and</strong> invert such matrices.<br />
A linked list <strong>of</strong> void* pointers.<br />
Definition <strong>of</strong> Woodwind structure, <strong>and</strong> functions to calculate<br />
transfer matrices <strong>and</strong> impedances.<br />
2.0 0.117 1.620<br />
4.0 0.124 1.620<br />
...<br />
(The origin <strong>of</strong> the x-axis used by ‘Waves’ is at the embouchure hole <strong>of</strong> the flute; hence the<br />
negative values.)<br />
8.1.7 Library files<br />
Various library files are used by the programs described in this section. A brief description <strong>of</strong><br />
each <strong>of</strong> these is given in Table 8.1 <strong>and</strong> the complete program listings are given in Appendix B.<br />
8.2 THE USER INTERFACE<br />
The previous section described the development <strong>of</strong> a set <strong>of</strong> comm<strong>and</strong>-line tools to calculate the<br />
acoustical <strong>and</strong> musical properties <strong>of</strong> a flute. These tools incorporate the mathematical model<br />
<strong>of</strong> the flute. In order to make the results <strong>of</strong> this thesis generally accessible to members <strong>of</strong> the<br />
flute making community, who may not have a scientific background, a user-friendly interface<br />
to the comm<strong>and</strong> line tools was developed, using the computer programming language Java.<br />
Java is a language developed by Sun Microsystems with similar syntax to C <strong>and</strong> C++, but Java<br />
applications are typically compiled to run on virtual machines. Programs developed using Java<br />
are easily deployed to different machines with different operating systems, since Java Virtual<br />
Machines (JVMs) are available for most popular platforms.<br />
8.2.1 Design goals<br />
The following attributes were considered highly desirable in the user interface:
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