Title:
KEY JUDGING MUSICAL DEVICE
Document Type and Number:
Japanese Patent JP3088919
Kind Code:
B2
Abstract:
PURPOSE: To allow the key of each block of music to be automatically judged by providing a chord progress imparting means for imparting chord progress, and a key judging means for judging the key of each chord in the block chord progress, imparted from the chord progress imparting means, from the series of chords indicated by chord progress.
CONSTITUTION: A CPU is a control device for realizing automatic composing function. A motif, chord progress, the sort of the used pulse scale, the sort of the used musical scale, and the like are inputted from an input device 2. Because of extracting tonal structure from the chord progress, (1) tonality is not changed frequently by the progress of a tune so as to keep the same tonality; (2) the composed sound of the chord is on the scale of specific tonality; (1) in the case of generating tonality change, the nature of being easily changed to closely-related tone such as dominant or subdominant tone is taken into account. The specific tonality distance is therefore defined between the chords, and the CPU 1 obtains the tonality of each chord by calculating the distance to the tonality of the first chord to extract desirable tonality structure.
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Inventors:
Junichi Nanko
Application Number:
JP33533094A
Publication Date:
September 18, 2000
Filing Date:
December 22, 1994
Export Citation:
Assignee:
CASIO COMPUTER CO.,LTD.
International Classes:
G09B15/00; G10G1/00; (IPC1-7): G10G1/00; G09B15/00
Domestic Patent References:
| JP6261099A |
Other References:
菊本哲也「新しい音楽通論」１９７５−４−１０，株式会社 全音譜出版社 Ｐ１５９〜１６１