PitchSpeller.java

package ie.dit;

public class PitchSpeller 
{	
	private float[] frequencies = {293.66f, 329.63f, 369.99f, 392.00f, 440.00f, 493.88f, 554.37f, 587.33f
			, 659.25f, 739.99f, 783.99f, 880.00f, 987.77f, 1108.73f, 1174.66f, 1318.51f, 1479.98f, 1567.98f, 1760.00f, 1975.53f, 2217.46f, 2349.32f};
	String[] spellings = {"D,", "E,", "F,", "G,", "A,", "B,", "C", "D", "E", "F", "G", "A", "B","c", "d", "e", "f", "g", "a", "b", "c'", "d'", "e'", "f'", "g'", "a'", "b'", "c''", "d''"}; 	
	//private String[] spellings = {"D", "E", "F", "G", "A", "B", "C", "D", "E", "F", "G", "A", "B","C", "D", "E", "F", "G", "A", "B", "C", "D", "E", "F", "G", "A", "B", "C", "D", "E", "F", "G", "A", "B", "C", "D"};
	
	public String spell(float frequency)
	{
		int minIndex = -1;
		float minDiff = Float.MAX_VALUE;
		
		for(int i = 0 ; i < frequencies.length ; i ++)
		{
			float diff = Math.abs(frequency - frequencies[i]);
			if (diff < minDiff)
			{
				minDiff = diff;
				minIndex = i;
			}
		}
		return spellings[minIndex];
	}
	
}