#region License
/* Copyright (c) 2005 Leslie Sanford
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#endregion
#region Contact
/*
* Leslie Sanford
* Email: jabberdabber@hotmail.com
*/
#endregion
using System;
namespace Multimedia.Midi
{
/// <summary>
/// Converts a MIDI note number to its corresponding frequency.
/// </summary>
public sealed class MidiNoteConverter
{
// Notes per octave.
private const int NotesPerOctave = 12;
// Offsets the note number.
private const int NoteOffset = 9;
// Reference frequency used for calculations.
private const double ReferenceFrequency = 13.75;
// Prevents instances of this class from being created - no need for
// an instance to be created since this class only has static methods.
private MidiNoteConverter()
{
}
/// <summary>
/// Converts note to frequency.
/// </summary>
/// <param name="noteNumber">
/// The number of the note to convert.
/// </param>
/// <returns>
/// The frequency of the specified note.
/// </returns>
public static double NoteToFrequency(int noteNumber)
{
double exponent = (double)(noteNumber - NoteOffset) / NotesPerOctave;
return ReferenceFrequency * Math.Pow(2.0, exponent);
}
}
}