0.5 Jbs2010-your first sound program

Table of contents

• Preface
  • Viewing tip
    • Listings
• General background information
• Discussion and sample code
  • The class named AudioPlayOrFile01
    • A formal mechanism for code reuse
    • The Java Standard edition library
    • Two special classes
    • Code reuse
  • The class named AudioFormatParameters01
  • Disk organization
  • The class named MusicComposer04
    • Beginning of the class named MusicComposer04
    • The instance variables
    • Command-line parameters
    • The main method
    • Compiling and executing the program
    • The constructor for MusicComposer04
    • Get and play or file the sound
  • The class named AudioSignalGenerator02
    • Beginning of the class named AudioSignalGenerator02
    • The constructor for AudioSignalGenerator02
    • The abstract method named getMelody
  • The class named WhiteNoise
    • Beginning of the class named WhiteNoise
    • The constructor for the WhiteNoise class
    • Beginning of the getMelody method
    • Overall structure of the program
    • The predefined audio parameters
    • Miscellaneous setup operations
    • Generating the white (random) noise
    • A stream of pseudorandom numbers
    • The sound of a stream of random numbers
• Run the program
• Miscellaneous
• Complete program listings

Preface

This module is part of a collection titled Accessible Objected-Oriented Programming Concepts for Blind Students using Java . It explains how to write a program that creates an audio output consistingof white noise.

Viewing tip

I recommend that you open another copy of this module in a separate browser window and use the following links to easily find the listings while you are reading about them.

Listings

• Listing 1 . Beginning of class MusicComposer04.
• Listing 2 . The file named WhiteNoise.bat.
• Listing 3 . Beginning of the constructor for MusicComposer04.
• Listing 4 . Get and play or file the sound.
• Listing 5 . Beginning of the class named AudioSignalGenerator02.
• Listing 6 . The constructor for AudioSignalGenerator02.
• Listing 7 . The abstract method named getMelody.
• Listing 8 . Beginning of the class named WhiteNoise.
• Listing 9 . Beginning of the getMelody method.
• Listing 10 . Miscellaneous setup operations.
• Listing 11 . Generating the white (random) noise.
• Listing 12 . The class named AudioPlayOrFile01.
• Listing 13 . The class named AudioFormatParameters01.
• Listing 14 . The class named MusicComposer04.
• Listing 15 . The class named AudioSignalGenerator02.
• Listing 16 . The class named WhiteNoise.

General background information

By this point in the course, you should have learned enough that you can put Java OOP to work in a substantive way. In this course, which is designedspecifically for blind students, you will write substantive programs that deal with something that you are probably very good at -- sound.

An earlier module explained some of the physical aspects of sound. It also explained a little about how you can write programs to create sound with acomputer.

This module will show you how to write a Java OOP program that uses a random number generator to produce white noise .