A handy little tool I knocked up last night to round-off a generated harmonic series to the nearest semi-tone (and output as a named note (C,C#,D,…) to a .txt file. Written in python, give it a root frequency, and the length of the number of partials you want to calculate.
# Handy tool for generating a harmonic series above a given root, # and then rounding out to the nearest 12-TET semitone. # owmtxy, 2013 # python v.2.7.5 import math root = input("Root frequency: ") length = input("Spectra length: ") freqSpectra =  noteSpectra =  # Write out to a .txt file = open('harmonic_spectra_'+str(root)+'Hz.txt', 'w') # Define note names noteName = [ 'C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'B'] ### convert freq to pitch method (inc octaves) def freq2pitch(freq): pitch = 12 * math.log(freq/261.626) / math.log(2) #calculate relative to middle C4 note = noteName[int(round(pitch)) % 12] #get name octave = (int(round(pitch)) / 12)+4 #get octave, offset from C(4) return str(note + str(octave)) # no. semitones relative to C4 for i in range(1,length+1): #give >length< partials above root freqSpectra.append(root*i) noteSpectra.append(freq2pitch(root*i)) # print out data to .txt print('Spectra as frequency (Hz) / closest note:') file.write('Partial t Freq t Note n') for i in range(length): txt = str(i+1)+"t"+str(freqSpectra[i])+"t"+str(noteSpectra[i])+"n" print i+1, "t",freqSpectra[i], "t", noteSpectra[i] file.write(txt) file.close()