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This module demonstrates runtime polymorphism using an array of an abstract type populated with references to objects of eight different subclasses of that abstract type in a format that is accessible to blind students.

Table of contents

Preface

This module is part of a collection titled Accessible Objected-Oriented Programming Concepts for Blind Students using Java . It demonstrates runtime polymorphism using an array of the abstract type AudioSignalGenerator02 populated with references to objects of eight different subclasses of AudioSignalGenerator02 in a format that is accessible to blind students.

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Listings

  • Listing 1 . Beginning of the class named MusicComposer08.
  • Listing 2 . Create and populate an array holding references to audio objects.
  • Listing 3 . Call the getMelody method on a subclass object selected at random.
  • Listing 4 . Play or file the melody.
  • Listing 5 . The class named AudioGraphSinusoidal.
  • Listing 6 . The class named AudioGraphSquareWave.
  • Listing 7 . The class named FMSweep.
  • Listing 8 . The class named MusicComposer08.
  • Listing 9 . The class named SquareWave.
  • Listing 10 . The class named StereoPingpong.
  • Listing 11 . The class named ToneMono.
  • Listing 12 . The class named TonesStereo.
  • Listing 13 . The class named WhiteNoise.
  • Listing 14 . The class named AudioFormatParameters01.
  • Listing 15 . The class named AudioPlayOrFile01.
  • Listing 16 . The class named AudioSignalGenerator02.

General background information

We have reached a plateau of sorts in our study of Java sound. This and previous modules have produced hard-coded sounds. Future modules will be moreflexible. For example, one future module will simulate a player piano. It will accept information about a melody as input data at runtime and will tailor the sound based on that information. Forexample, in future modules, you will learn to write a program to produce sounds like Greensleeves and MaryHadALittlelamb .

But I am getting ahead of myself. In previous modules, you have learned:

  • A little about the physical characteristics of sound.
  • How to produce white or pink noise.
  • How to produce square wave sound.
  • How to produce a pure sinusoidal tone.
  • How to produce an audio graph of a sinusoid.

In this module, you will learn how to produce a few more types of sounds:

  • An audio graph for a square wave.
  • A frequency-modulated sweep in stereo.
  • A stereo ping pong effect.
  • A pair of pure tones of different frequencies in stereo.

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Source:  OpenStax, Accessible objected-oriented programming concepts for blind students using java. OpenStax CNX. Sep 01, 2014 Download for free at https://legacy.cnx.org/content/col11349/1.17
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