|Under such circumstances, binning the data can reveal patterns. Here is the same data grouped into four roughly equal-sized bins.|
|Here is the log plot with respect to bin number.|
|Using a carefully chosen bin size, the plot illustrates the underlying fact that there approximately 3/2 as many notes in successively higher pitched bins.
If, instead of plotting log of the count against respective bin numbers, we choose to make the x-axis the log of the mid-period size of each bin, we would also obtain a straight line. This is because the pitch periods have a logarithmic relationship to each other other through the formula for finding the frequency of a given pitch:
|Fp = Fref 2d/12|
|where Fp is the frequency of pitch we wish to calculate, Fref is the frequency of a reference pitch, and d is the intervallic distance between the two pitches as measured in semitones|
Return to Pitch Scaling.
© 2004 Harlan Brothers