92 lines
2.3 KiB
Python
Executable File
92 lines
2.3 KiB
Python
Executable File
#!/usr/bin/python
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import sys, string, math, argparse
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parser = argparse.ArgumentParser()
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parser.add_argument('-l', '--length', type=int, default=64, help="length of note table")
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parser.add_argument('-u', '--upper', type=int, default=49, help="upper note # to test")
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args = parser.parse_args()
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test_notes = args.upper
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final_notes = args.length
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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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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(note, besthz, bestperiod, notehz)
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print('%d,' % period, end='')
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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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