Question

You are given a file chords.txt where each line contains three double values. The first value is a duration and the second and third values are frequencies. Place this file into the data folder on Eclipse. Once again you are to read values in from a file but you must be careful in doing this as different values mean different things. After you open the file, follow this pseudocode: While not at the end of file for StdIn declare an array of length 2 read the duration for i in the range 0 to 1 read the frequency into the ith frequencies array entry end play the chord end Note that we are now using nested loops. To play a chord, you will need a different method and that's included here: public static void playchord (double duration, double frequencies final int slicecount (int) (StdAudio. SAMPLE RATE duration final double slices new double sliceCount+1 for (int i 0; i slice Count i++) double chord 0.0 for (double frequency frequencies) chord Math.sin (2 Math.PI i frequency StdAudio. SAMPLE RATE) slices [i chord/ frequencies. length. Std Audio play(slices);

Chords.txt

1.0 350.0 440.0

2.0 440 480

4.0 0 0

2.0 440 480

4.0 0 0

2.0 440 480

4.0 0 0

0.5 480 620

0.5 0 0

0.5 480 620

0.5 0 0

0.5 480 620

0.5 0 0

Answer 1

// Play.java

package chord; //Please give name of your package

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.StringTokenizer;

public class Play {

   private static final String FILENAME="D:\\WS17.2\\Sample\\src\\chord\\Chords.txt"; //give the absulate path of //file
  
   public static void playChord(double duration, double[] frequencies)
   {
       final int sliceCount = (int)(StdAudio.SAMPLE_RATE * duration);
       final double[] slices= new double[sliceCount + 1];
       for(int i=0;i<=sliceCount;i++)
       {
           double chord=0.0;
           for(double frequency:frequencies)
           {
               chord += Math.sin(2*Math.PI*i*frequency/StdAudio.SAMPLE_RATE);
           }
           slices[i] = chord/frequencies.length;
       }
       StdAudio.play(slices);
   }
  
   public static void main(String[] args)
   {
       BufferedReader br = null;
       FileReader fr = null;

       try {

           fr = new FileReader(FILENAME);
           br = new BufferedReader(fr);

           String sCurrentLine;

           br = new BufferedReader(new FileReader(FILENAME));
          
           while ((sCurrentLine = br.readLine()) != null) {
               System.out.println(sCurrentLine);
               StringTokenizer st = new StringTokenizer(sCurrentLine, " ");
               double []freq = new double[2];
               double duration = Double.parseDouble(st.nextToken());
               int i=0;
               while(st.hasMoreTokens())
               {
                   freq[i] = Double.parseDouble(st.nextToken());
                   i++;
               }
               playChord(duration,freq);
           }
          

       } catch (IOException e) {

           e.printStackTrace();

       } finally {

           try {

               if (br != null)
                   br.close();

               if (fr != null)
                   fr.close();

           } catch (IOException ex) {

               ex.printStackTrace();

           }

       }
   }
}

//I am assuing you have StdAudio class with you, If you do not have this class please let me know.

//output:

D Play,java Chors.bt StdAudio.java ー ロ| |BE Outline X |围Task List 1 package chord; chord 3e import java.io.BufferedReader: 4 import Java.io.FileReader; 5 import java.io.IOException; 6 import java.util.StringTokenizer; SF FILENAME: String playChord(double, double[I): void main(String[]): void 8 public class Play f 10 private static final String FILENAME. "D : \\ws 17.2\\Sample\\src\\chord\\Chords.txt 12 public static void playChord (double duration, double 13 14 15 frequencies) final int sliceCount-(int) (StdAudio.SAMPLE RATE duration) final double slices-new double[sliceCount +11: R Markers 啿Properties 鼎Servers Data Source Explorer Snippets亄Problems A Search Console X Debug Palette Progress terminated> Play Java Application] C:IProgram FilesJavaljdk1.8.0_111\binljavaw.exe(Jun 9, 2017, 11:59:41 AM) 4.000 2.0 440 480 4.0 0o 2.0 440 480 4.0 0o 0.5 480 620 0.5 0 0 0.5 480 620 0.5 00 0.5 480 620 0.5 0o Writable Smart Insert 10:32