Generate tone frequencies

From Dave Goodman CompuServe ID: [72330,130]

This equation allows programmers and others to determine the frequency for a musical note. For instance, you can enter middle A and it will tell you that its 440 Hz. The equation also gives an example of the use of the if(S(variable)) function.

{Music|!Tone Frequencies !

!Enter the octave, then press !

!function key for the note !

!Example: 4, F2 (octave), F8 (A) !

!and you will see A4 = 440 hz !

Octave 0 +

if(S(C), 2093.00 / 2^(7-Octave) - C,

if(S(D), 2349.32 / 2^(7-Octave) - D,

if(S(E), 2637.02 / 2^(7-Octave) - E,

if(S(F), 2793.83 / 2^(7-Octave) - F,

if(S(G), 3135.96 / 2^(7-Octave) - G,

if(S(A), 3520.00 / 2^(7-Octave) - A,

if(S(B), 3951.07 / 2^(7-Octave) - B,

if(S(CS),2217.46 / 2^(7-Octave) -CS,

if(S(DS),2489.02 / 2^(7-Octave) -DS,

if(S(FS),2959.96 / 2^(7-Octave) -FS,

if(S(GS),3322.44 / 2^(7-Octave) -GS,

if(S(AS),3729.31 / 2^(7-Octave) -AS,

0))))))))))))

}

A shortcut for keying in the above equation is to enter the line:

if(S(C), 2093.00 / 2^(7-Octave) - C

Press (ENTER), then highlight the line with (SHIFT)-(<DOWN-ARROW>). Copy the line to the clipboard, using [CTRL]-[C] and then paste it 11 times, using the keystrokes [CTRL]-[V]. Make sure you're in over-write mode and type in the correct frequency number letter for each note and 12 parentheses after the final 0.