51 lines
1.0 KiB
Python
Executable File
51 lines
1.0 KiB
Python
Executable File
#!/usr/bin/python
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A = 440
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notes = {
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'C' : 0,
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'D' : 2,
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'E' : 4,
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'F' : 5,
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'G' : 7,
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'A' : 9,
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'B' : 11,
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}
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rel = (2**(1/12.))
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def note2freq(name):
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sharp = name[1] == '#'
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flat = name[1] == 'b'
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if sharp or flat:
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note = name[0:1]
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octave = int(name[2])
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else:
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note = name[0]
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octave = int(name[1])
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num = notes[note]
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if sharp:
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num += 1
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if flat:
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num -= 1
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fullnum = num + 12*(octave - 5)
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return A*rel**(fullnum + 3)
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if __name__ == '__main__':
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test_fmt = '{:3} gave {: 9.2f} Hz\nexpected {: 9.2f} Hz'
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def test(name, expected):
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print(test_fmt.format(name, note2freq(name), expected))
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test('C2' , 65.41)
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test('Ab4', 415.30)
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test('A4' , 440.00)
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test('B4' , 493.88)
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test('B#4', 523.25)
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test('Cb5', 493.88)
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test('C5' , 523.25)
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print()
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test('E4' , 329.63)
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test('B3' , 246.94)
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test('G3' , 196.00)
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test('D3' , 146.83)
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test('A2' , 110.00)
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test('E2' , 82.41)
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