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Most of the websites i have looked at, say that the frequency of middle C note is approximately 261.626 Hz. and that middle C on guitar is at the 5th string 3rd fret. but my tuner says the frequency at the 5th string 3rd fret is 130.81 Hz.
Conversely, all higher center frequencies for octave bands can be defined from each other using the formula 1 2 ctr ctr fnn + = f. Then for each center frequency, the half-octave low (high) frequency for each octave band are (respectively) given by the formulae low 2 12 ffnn = and high 2 12 fnn = f.f we set/define the 13 th half-octave bandâs center frequency to be 13 1000 f ctr â¡ Hz, then all lower center frequencies for 1/2-octave bands can be defined from each other using the formula 121 2 ctr ctr ffnn â = .