79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
/* Scale in the key of 1/10000 */
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/*
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These are periods -- if you delay this long,
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then toggle the speaker pin, you'll get approximate
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pitches.
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This is the 16-bit version. The pitches get less accurate
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as they get higher, but not as bad as the 8-bit one.
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"x" denotes sharp.
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Can be generated by Python:
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import math
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scale = ['C', 'Cx', 'D', 'Dx', 'E', 'F', 'Fx', 'G', 'Gx', 'A', 'Ax', 'B']
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def octave(baseLength):
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periods = [baseLength / math.exp(x*math.log(2)/12) for x in range(0, 12)]
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periods = [int(round(x)) for x in periods]
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return( zip(scale, periods) )
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for i in range(0,4):
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for note, period in octave(10000 / 2**i):
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if period < 65500:
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noteString = note + str(i)
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print "#define {:<5}{:>6}".format(noteString, period)
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*/
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#define C0 10000
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#define Cx0 9439
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#define D0 8909
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#define Dx0 8409
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#define E0 7937
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#define F0 7492
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#define Fx0 7071
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#define G0 6674
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#define Gx0 6300
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#define A0 5946
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#define Ax0 5612
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#define B0 5297
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#define C1 5000
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#define Cx1 4719
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#define D1 4454
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#define Dx1 4204
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#define E1 3969
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#define F1 3746
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#define Fx1 3536
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#define G1 3337
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#define Gx1 3150
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#define A1 2973
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#define Ax1 2806
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#define B1 2649
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#define C2 2500
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#define Cx2 2360
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#define D2 2227
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#define Dx2 2102
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#define E2 1984
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#define F2 1873
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#define Fx2 1768
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#define G2 1669
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#define Gx2 1575
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#define A2 1487
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#define Ax2 1403
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#define B2 1324
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#define C3 1250
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#define Cx3 1180
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#define D3 1114
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#define Dx3 1051
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#define E3 992
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#define F3 936
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#define Fx3 884
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#define G3 834
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#define Gx3 787
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#define A3 743
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#define Ax3 702
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#define B3 662
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