Pseudo-octave
From Wikipedia, the free encyclopedia
A pseudo-octave, pseudooctave,[1] or paradoxical octave[2] in music is an interval whose frequency ratio is not 2:1 (2.3:1[1] or 1.9:1, for example), that of the octave, but is perceived or treated as equivalent to this ratio, and whose pitches are considered equivalent to each other as with octave equivalency.
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