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Fix in formula for creating frequency from MIDI note #348

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per1234 merged 1 commit into from
Jul 12, 2024
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Fix in formula for creating frequency from MIDI note #348

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Formula correction 
The stated formula for converting midi-notes to frequency is wrong – the base and exponent of the second factor should be interchanged
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@x-1xps
x-1xps authored Jul 11, 2024
commit 2d15db30d59ac456c6d2f5ff9693d4dd9af54b16
2 changes: 1 addition & 1 deletion libraries/AnalogWave/examples/DACEqualTemperedScale/DACEqualTemperedScale.ino
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Expand Up @@ -8,7 +8,7 @@
a formula for converting MIDI note numbers (0-127) to pitches. This sketch
reduces that to the notes 21 - 108, which are the 88 keys found on a piano:

frequency = 440 * ((noteNumber - 69) / 12.0)^2
frequency = 440 * 2^((noteNumber - 69) / 12.0)

You can see this applied in the code below.

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