public class TestDBVolume {
    static int maxVolumeLevel = 20;
    static int minDBLevel = -100;

    public static void main(String[] args) {
        for (int volume = 0; volume <= maxVolumeLevel; ++volume) {
          int volumeInDecibels = calulateDSPVolume(volume);
          String output = String.format("volume: %d, db = %d", volume, volumeInDecibels);
          System.out.println(output);
        }
    }

    static private int calulateDSPVolume(int volume) {
       if (maxVolumeLevel == 0) {
           return 0;
       }

       int volumeInDecibels = (int) ((1 - Math.pow((volume / maxVolumeLevel), 0.125)) * (minDBLevel));

       return volumeInDecibels;
   }
}