0.10 Jbs2060-a player piano simulator

Table of contents

• Preface
  • Viewing tip
    • Listings
• General background information
  • A player piano simulator
  • I am not a musician
  • Required classes
• Discussion and sample code
  • The class named MusicComposer09
    • Beginning of the class named MusicComposer09
    • The main method
    • Beginning of the constructor for the MusicComposer09 class
    • Get a melody array
  • The class named PlayerPiano01
    • Treble clef and bass clef
    • Command-line parameters
    • Required text file format
    • Shaping the notes
    • Beginning of the PlayerPiano01 class
    • The constructor for the PlayerPiano01 class
    • Beginning of the getMelody method
    • The treble clef and bass clef data
    • Beats per second
    • Get and save treble clef note data
    • Parsing the treble clef note data
    • Get and save bass clef note data
    • Compute the length of each clef in beats
    • Check for treble and bass clefs of different lengths
    • Convert treble notes to amplitude values
    • Convert bass notes to amplitude values
    • Populate and return the melody array with stereo data
    • Populate and return the melody array with monaural data
    • The getPiano method
    • Musical instruments must be tuned
    • The in-between frequencies
    • Beginning of the getPiano method
    • Store the current note and compute the frequency of the next note
    • Construct the name of the next note
    • Beginning of the method named makeMusic
    • Process each array containing duration and note names in the ArrayList object
    • Process each sample
    • Process each piano key that is pressed
    • Use a scale factor to shape the note
• 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 simulates a player piano in a formatthat is accessible to blind students.

Here are some sample melodies produced by the program. (You should be able to play these audio files with any standard media player that can handle the AU file type. In case you are onthe OpenStax site and you are unable to download the audio files, click the Legacy Site link at the top of this page to switch over to the same module on the Legacy site. You should be able todownload the audio files from there .)

• AllNotes
• Chords
• FourScales
• Greensleeves
• MaryLambSimple
• MaryLambStereo
• Scales

Click here to download a zip file containing the text files and the Windows batch files needed to playthese melodies. The zip file also contains the audio files of type AU listed above.

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 the class named MusicComposer09.
• Listing 2 . The main method.
• Listing 3 . Beginning of the constructor for the MusicComposer09 class.
• Listing 4 . Get a melody array.
• Listing 5 . Beginning of the PlayerPiano01 class.
• Listing 6 . The constructor for the PlayerPiano01 class.
• Listing 7 . Beginning of the getMelody method.
• Listing 8 . Get and save treble clef note data.
• Listing 9 . Get and save bass clef note data.
• Listing 10 . Compute the length of each clef in beats.
• Listing 11 . Check for treble and bass clefs of different lengths.
• Listing 12 . Convert treble notes to amplitude values.
• Listing 13 . Convert bass notes to amplitude values.
• Listing 14 . Populate and return the melody array with stereo data.
• Listing 15 . Populate and return the melody array with monaural data.
• Listing 16 . Beginning of the getPiano method.
• Listing 17 . Store the current note and compute the frequency of the next note.
• Listing 18 . Construct the name of the next note.
• Listing 19 . Beginning of the method named makeMusic.
• Listing 20 . Process each array containing duration and note names in the ArrayList object.
• Listing 21 . Process each sample.
• Listing 22 . Process each piano key that is pressed.
• Listing 23 . Use a scale factor to shape the note.
• Listing 24 . The class named AudioFormatParameters01.
• Listing 25 . The class named AudioPlayOrFile01.
• Listing 26 . The class named AudioSignalGenerator02.
• Listing 27 . The class named MusicComposer09.
• Listing 28 . The class named PlayerPiano01.
• Listing 29 . The file named GreensleevesTreble.txt
• Listing 30 . The file named GreensleevesBass.txt
• Listing 31 . The file named Greensleeves.bat.