Just-noticeable difference
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The just-noticeable difference (JND) is an estimation of the smallest interval that can be distinguished by an average listener.
The melodic JND is commonly given as:
- 10 ¢ (Wikipedia: Just-noticeable difference #Music production applications)
- 6 ¢ (H-System)
- 3.5 ¢ (Unnoticeable commas vs. Small commas)
The harmonic JND is much smaller because it becomes possible to discern beat frequencies.