Package midi

source code

Author: Mark Granroth-Wilding <mark.granroth-wilding@ed.ac.uk>

Submodules

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jazzparser.harmonical.midi.chords: Justly intoned chord sequence realization

Functions

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tuple

tonal_space_note_events(coord, start, duration, origin_note=60, velocity=100)
Creates the MIDI events needed to play the given tonal space coordinate.

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tuple

tonal_space_tuning(coord, origin_note=60)
Produces MIDI single note tuning event data that will retune the equal temperament equivalent note of the given coordinate to the true pitch of that coordinate.

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frequency_note_number_floor(freq)
Given a float frequency, returns the midi note number that represents to nearest ET note below this frequency.

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tonal_space_et_note(coord, valid_note=False, origin_note=60)
Returns the MIDI note number of the note to which equal temperament maps the given 3D tonal space coordinate.

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et_note_frequency(note)
Calculates the frequency in Hz of the given MIDI note number, assuming equal temperament and 440Hz as the A above middle C.

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Variables

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__package__ = 'jazzparser.harmonical.midi'

Function Details

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tonal_space_note_events(coord, start, duration, origin_note=60, velocity=100)

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Creates the MIDI events needed to play the given tonal space coordinate. These will be a single-note tuning event (to retune the appropriate note), a note-on event and a note-off event.

Parameters:

coord (tuple) - 3D tonal space coordinate
start (int) - start time of note in ticks
duration (int) - length of the note in ticks
origin_note (int) - midi note number to assume the origin of the tonal space is equal to in pitch (default 60, middle C)

Returns: tuple

(tuning event, note on event, note off event)

tonal_space_tuning(coord, origin_note=60)

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Produces MIDI single note tuning event data that will retune the equal temperament equivalent note of the given coordinate to the true pitch of that coordinate. This can, for example, be placed in a stream directly before a note-on event for that note to play the tonal space point.

If the resulting note number is outside the range of midi notes (0-127), it is shifted to the nearest octave that is within the range.

Parameters:

origin_note (int) - midi note number to assume the origin of the tonal space is equal to in pitch (default 60, middle C)

Returns: tuple

(note,semitone,cents), where note is the note to be tuned, and semitone and cents between them define the pitch to tune to. This can be used as note change data for a midi single note tuning event.

tonal_space_et_note(coord, valid_note=False, origin_note=60)

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Returns the MIDI note number of the note to which equal temperament maps the given 3D tonal space coordinate.

Parameters:

valid_note (bool) - if True, permits only valid MIDI notes (i.e. in range 0-127). If the true note is outside this range, returns the note in the nearest octave that is in the range
origin_note (int) - midi note number to assume the origin of the tonal space is equal to in pitch (default 60, middle C)