1. Musical Interval:
a tune consists of a sequence of frequency changes,
called "intervals".
We perceive the intervals as being the same if the RATIO of the frequencies is the same:
example: 1:2 ratio (octave) 200Hz 400Hz
same as 300Hz 600Hz
2:3 ratio (ìfifthî) 200Hz 300Hz
same as 300Hz 450Hz
divide or multiply all frequencies of a tune by same number -> same tune (called ìtranspositionî)
a musical interval is a given frequency RATIO
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