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https://github.com/sehugg/8bitworkshop.git
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90 lines
2.2 KiB
Python
Executable File
90 lines
2.2 KiB
Python
Executable File
#!/usr/bin/python
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import sys, math
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test_notes = int(sys.argv[1]) or 49
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final_notes = int(sys.argv[2]) or 64
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basehz = 15720.0 #4
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basehz2 = 5240.0 #12
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basehz3 = 1014.2 #6
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s = 8
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bittable = [
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0b00000000,
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0b00000001,
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0b00010001,
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0b01001001,
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0b01010101,
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0b10110101,
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0b11011011,
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0b11101111,
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]
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results = []
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for a440 in range(4200,4600):
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error = 0
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for note in range(4,test_notes):
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notehz = a440 / 10.0 * math.pow(2.0, (note - 49) / 12.0);
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period = round(basehz * s / notehz) / s
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tonehz = basehz / period
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if period < s or period > 32*s:
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tonehz = -10000
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period2 = round(basehz2 * s / notehz) / s
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tonehz2 = basehz2 / period
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if period2 < s or period2 > 32*s:
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tonehz2 = -10000
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period3 = round(basehz3 * s / notehz) / s
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tonehz3 = basehz3 / period
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if period3 < s or period3 > 32*s:
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tonehz3 = -10000
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error += min(abs(notehz-tonehz), abs(notehz-tonehz2), abs(notehz-tonehz3))
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#print a440,note,notehz,notehz-tonehz,period
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#if a440 == 4405:
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# print '%d,%f,%d' % (note,tonehz-notehz,period)
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results.append((error, a440))
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results.sort()
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best_error, best_a440 = results[0]
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best_a440 /= 10.0
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print '//', best_a440, best_error, test_notes
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periods = []
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tones = []
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bits = []
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print "const int note_table[%d] = {" % final_notes
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for note in range(0,final_notes):
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notehz = best_a440 * math.pow(2.0, (note - 49) / 12.0);
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bestperiod = 255
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bestscore = 999999
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besthz = -1
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for hz in [basehz, basehz2, basehz3]:
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period = int(round(hz * s / notehz))
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if period >= s and period <= 32*s:
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tonehz = hz / period
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error = notehz - hz
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if error < bestscore:
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bestscore = error
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bestperiod = period
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besthz = hz
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#print '%d,' % period,
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print note, besthz, bestperiod, notehz
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periods.append(bestperiod / s - 1)
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bits.append(bittable[bestperiod & (s-1)])
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if besthz==basehz:
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tones.append(4)
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elif besthz==basehz2:
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tones.append(12)
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elif besthz==basehz3:
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tones.append(6)
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else:
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tones.append(0)
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print "};"
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print periods
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print bits
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print tones
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