US 5,288,234 AGranted

Device for composing and decomposing chords and scales

OwnerHouari Hamziinventor

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Abstract

This invention consists of a device for composing, decomposing, retransposing and retranscribing all chords and scales contained in music. The device in question comprises two superimposed disks of different diameters, joined at their center by a pin enabling the disks to rotate independently. The twelve musical notes of the diatonic scale are written on the lower disk with the larger diameter. Intervals, interval qualifications, degrees of intervals and various indexed scales are written on the upper disk with the smaller diameter. Whatever the composition, decomposition, retransposition and retranscription information required for a given chord or scale, the user, by rotating the disks, matches the chosen note with the "FUNDAMENTAL" interval, on which all chord or scale building is based. This allows him to see the position, degree, interval and qualification of the other notes of the chord or scale. This device may be used for all diatonic, monophonic and polyphonic instruments.

Claims7

Dependent claims

Device for composing, decomposing, retransposing and retranscribing all chords and scales contained in music and comprising two superimposed disks of different diameters joined at their centre by a pin enabling the disks to rotate independently;

the device is characterized by a lower disk with a larger diameter, on whose outer edge is marked the sequence of notes of the diatonic scale A;
A#/Bb;
B;
C;
C#/Db;
D;
D#/Eb;
E;
F;
F#/Gb;
G;
G#/Ab;
the device features an upper disk with a smaller diameter divided into three bands by two concentric circles, the outer band indicates sequentially the sequence of intervals with their qualifications below, viz. the FUNDAMENTAL/OCTAVE interval;
the SECOND interval with the minor, Major qualifications below;
the THIRD interval with the minor, Major qualifications below;
the FOURTH interval with the perfect qualification below;
the FOURTH qualification with the augmented qualification below and the FIFTH interval with the diminished qualification below;
the FIFTH interval with the perfect qualification below;
the SIXTH interval with the minor, Major qualifications below;
the SEVENTH interval with the minor, Major qualifications below, the middle band indicates abbreviations related to the scales, the inner band indicates degrees in numerical sequence from 1 to 14, the whole device is arranged so that each note of the lower disk is matched by information marked in the three bands of the upper disk and pertaining to chords, scales and degrees.

17 more elements

Dependencies are inferred from the claim text.