Interval inversion |

Interval inversion – moving the sounds of the interval by an octave, in which its base becomes the upper sound, and the top becomes the lower one. The inversion of simple intervals (within an octave) is done in two ways: by moving the base of the interval up an octave or the vertex down an octave. As a result, a new interval appears, supplementing the original one to an octave, for example, a seventh is formed from the reversal of a second, a sixth from the reversal of a third, etc. All pure intervals turn into pure ones, small into large, large into small, increased into decreased and vice versa, double increased into double decreased and vice versa. The conversion of simple intervals into compound and compound intervals into simple ones is carried out in three ways: by moving the lower sound of the interval up two octaves or the upper sound two octaves down, or both sounds by one octave in the opposite direction.

It is also possible to convert compound intervals into compound intervals; in these cases, the movement of one sound is made by three octaves, and both sounds – by two octaves in the opposite direction (crosswise). See interval.

V. A. Vakhromeev