We perceive the intervals as being ìthe sameî if the RATIO of the frequencies is the same:
example: 1:2 ratio (octave) 200Hz-> 400Hz
or 400Hz -> 800Hz
2:3 ratio (ìfifthî) 200Hz -> 300Hz
or 400Hz -> 600Hz
divide or multiply all frequencies by same number
-> same interval
1. Musical Interval
a musical interval is defined by frequency RATIO
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