isbell@marvin.DEC (Chris Isbell) (05/30/84)
[] hou5d!mat asks how he can determine the frequency of C. The general rule for determining the frequency of a note on the equal tempered scale based on standard concert pitch is as follows:- f = 440*2^(x/12) where: f is the frequency required and x is the number of semitione above A of the note in question. ( ^ means raised to the power of.) The result may be doubled (to raise it an octave), or halved (to lower it an octave) as required. In the specific case of C, x=3 (A-Bb-B-C), therefore f= 440*2^(3/12) This equals 523.251 Hz. Middle C is an octave lower at 216.163 Hz. Note that real instruments are not often tuned (or played) to an accurate equal tempered scale. This has be the subject of some debate in this news group. Chris.