Pitchtools

pitchtools provides a set of functions to work with musical pitches.

Features

convert between frequencies, midinotes and notenames
microtones are fully supported
split a pitch into its multiple components (pitch class, octave, microtonal deviation, etc.)
transpose a pitch taking its spelling into consideration
create custom pitch converters to work with custom reference frequencies, or modify the reference frequency globally

Documentation

https://pitchtools.readthedocs.io/en/latest/

Examples

Convert some note names to frequencies

>>> from pitchtools import *
>>> eflat_scale = "4Eb 4F 4G 4Ab 4Bb 5C 5D".split()
>>> for note in eflat_scale:
...     # convert notename to frequency using the default reference frequency (442 Hz)
...     freq = n2f(note)
...     # convert frequency to midi
...     midinote = f2m(freq)
...     print(f"{note} = {freq:.1f}Hz (midi = {midinote})")
4Eb = 312.5 Hz (midi = 63.0)
4F  = 350.8 Hz (midi = 65.0)
4G  = 393.7 Hz (midi = 67.0)
4Ab = 417.2 Hz (midi = 68.0)
4Bb = 468.3 Hz (midi = 70.0)
5C  = 525.6 Hz (midi = 72.0)
5D  = 590.0 Hz (midi = 74.0)

The same but with a different reference frequency

from pitchtools import *
ebscale = "4Eb 4F 4G 4Ab 4Bb 5C 5D".split()
cnv = PitchConverter(a4=435)
for note in ebscale:
    # Convert to frequency with default a4=442 Hz
    freq = cnv.n2f(note)
    midinote = cnv.[Of2m(freq)
    print(f"{note} = {freq} Hz (midinote = {midinote})")

Microtones

Microtones are fully supported, either as fractional midinotes or as notenames.

>>> from pitchtools import *
>>> n2m("4C+")
60.5
>>> n2m("4Db-10")
60.9
>>> m2n(61.2)
4C#+20

Microtonal notation

Midinote	Notename
60.25	4C+25 / 4C>
60.45	4C+45
60.5	4C
60.75	4Db-25
61.5	4D-
61.80	4D-20
63	4D#
63.5	4D#+
63.7	4E-30

Installation

pip install pitchtools

gesellkammer / pitchtools