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stepper-motor-synth
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gen_pitch_table: account for drop in higher frequency notes

This commit is contained in:
Peter Cai 2021-06-11 14:45:29 +08:00
parent 882f164a24
commit 00d233ebe5
1 changed files with 14 additions and 0 deletions
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14
gen_pitch_table.py
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@ -8,11 +8,25 @@ pitch_C1 = 24
pitch_A4 = 69
freq_A4 = 440
pitch_D5 = 74
pitch_F5 = 77
def pitch_to_freq(pitch):
dist_A4 = pitch - pitch_A4
factor = pow(2, abs(dist_A4) / 12)
if dist_A4 > 0:
# Notes after A4 are about 20 cents flat
factor = factor * pow(2, 20 / 12 / 100)
if pitch >= pitch_D5:
# After D5 it's about another 10 cents flat
factor = factor * pow(2, 10 / 12 / 100)
if pitch >= pitch_F5:
# After F5 it's about another 10 cents flat
factor = factor * pow(2, 10 / 12 / 100)
return freq_A4 * factor
else:
return freq_A4 / factor