Patent ID: 8802956
Filing Date: 2014-08-12
Classification: G10H

Abstract:
1. An automatic accompaniment apparatus for an electronic keyboard musical instrument for performing chord detection based on a state of a key depressed in a region combining at least an accompaniment region and a melody playing region in a keyboard with a plurality of keys, so as to perform automatic accompaniment based on a detected chord, the automatic accompaniment apparatus, comprising: setting unit configured to set a detection mode by switching between a first detection mode and a second detection mode, the first detection mode setting a whole region combining the accompaniment region and the melody playing region to a detected object of the chord detection, the second detection mode setting a part of the accompaniment region to a detected object of the chord detection; first determining unit configured to determine whether or not a state of a key depressed in a region set to the detected object corresponds to any chord in a first chord group in a case where the first detection mode is set by the setting unit; first selecting unit configured to select a corresponding chord in the first chord group in a case where the first determining unit determines that the state of the key depressed corresponds to one chord in the first chord group; second determining unit configured to determine whether or not the state of the key depressed in the region set to the detected object corresponds to any chord in a second chord group in a case where the second detection mode is set by the setting unit; second selecting unit configured to select a corresponding chord in the second chord group in a case where the second determining unit determines that the state of the key depressed corresponds to one chord in the second chord group; and automatic accompaniment unit configured to perform automatic accompaniment based on a chord selected by the first selecting unit or the second selecting unit, wherein in a case where the number of chords belonging to the first chord group is set to be fewer than the number of chords belonging to the second chord group, and the setting unit sets the first detection mode, a previously selected chord is continuously determined when the first determining unit determines that the state of the key depressed is not any chord in the first chord group.