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kennethreitz
9da3ac8b28
- circle_of_fifths.py — visualize keys around the circle - chord_identifier.py — identify chords from notes and fingerings - key_explorer.py — explore keys, signatures, progressions, borrowed chords - temperament_comparison.py — compare equal, Pythagorean, and meantone - chord_tension.py — analyze tension, consonance, and voice leading - world_scales.py — scales from 6 musical traditions - fretboard_explorer.py — instruments, tunings, capo transposition - midi_converter.py — MIDI ↔ note ↔ frequency reference - progression_writer.py — famous progressions, Nashville numbers, random generation - interval_trainer.py — interval names, songs, and consonance ranking - overtone_series.py — harmonics and why chords sound good - key_detection.py — detect keys from melodies and chord progressions Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
36 lines
1.3 KiB
Python
36 lines
1.3 KiB
Python
"""Convert between MIDI note numbers, frequencies, and note names."""
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from pytheory import Tone
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print("MIDI ↔ Note ↔ Frequency Reference")
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print("=" * 50)
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print()
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print(f"{'MIDI':>5s} {'Note':>5s} {'Freq (Hz)':>10s} {'Octave':>6s}")
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print(f"{'─' * 5} {'─' * 5} {'─' * 10} {'─' * 6}")
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# Show all notes from C2 to C7
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for midi in range(36, 97):
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tone = Tone.from_midi(midi)
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freq = tone.frequency
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print(f"{midi:>5d} {tone.full_name:>5s} {freq:>10.2f} {tone.octave:>6d}")
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# Useful reference points
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print()
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print("Key Reference Points:")
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print(f" Lowest piano note: A0 = MIDI {Tone.from_string('A0', system='western').midi}")
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print(f" Middle C: C4 = MIDI {Tone.from_string('C4', system='western').midi}")
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print(f" Concert A: A4 = MIDI {Tone.from_string('A4', system='western').midi}")
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print(f" Highest piano note: C8 = MIDI {Tone.from_string('C8', system='western').midi}")
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# Round-trip demo
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print()
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print("Round-trip conversions:")
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for start in ["C4", "A4", "F#3", "Bb5"]:
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tone = Tone.from_string(start, system="western")
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midi = tone.midi
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freq = tone.frequency
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from_midi = Tone.from_midi(midi)
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from_freq = Tone.from_frequency(freq)
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print(f" {start:4s} → MIDI {midi} → {from_midi.full_name:4s} | "
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f"{start:4s} → {freq:.2f} Hz → {from_freq.full_name}")
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