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Chord-name detection apparatus and chord-name detection program

A detection device and chord technology, applied to instruments, electro-acoustic musical instruments, etc., can solve problems such as inability to detect pitch

Inactive Publication Date: 2008-02-13
KAWAI MUSICAL INSTR MFG CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the pitch changes frequently like in jazz (the pitch changes in quarter notes, etc.), the pitch cannot be detected correctly by this method.

Method used

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  • Chord-name detection apparatus and chord-name detection program
  • Chord-name detection apparatus and chord-name detection program

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Experimental program
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Embodiment 1

[0197] Fig. 12 is an overall block diagram of the chord detection device of the present invention. In this figure, the structures of beat detection and bar detection are basically the same as those described above. Among the same structures, the structures for tempo detection and chord detection are different from the above structures, so the same description will be repeated below except for the formulas.

[0198] According to the figure, the present chord detection device is configured to include: an input unit 1 for inputting a sound signal; based on the input sound signal, FFT operation is performed using parameters suitable for beat detection at predetermined time intervals (frames), and according to the obtained Scale note strength detection section 2 for beat detection of each scale note strength of each frame obtained from the strength spectrum obtained; calculates the incremental value of each scale note strength of each frame for all scale notes, and obtains the value...

Embodiment 2

[0253] The structure of this embodiment is different from the structure of Embodiment 1. The Euclidean distance of the note intensity of each scale is calculated to detect the degree of harmony change, and the structure of the chord is detected by dividing the bars.

[0254] However, if the Euclidean distance is simply calculated at this time, the Euclidean distance becomes a large value due to a sudden sound increase (such as the beginning of a music) or a rapid sound decay (such as the end of a music, interruption, etc.). It is possible that although the harmony does not change, the measures are only divided according to the strength of the sound. Then, as shown in Figure 17, before calculating the Euclidean distance, the intensity of each scale note is normalized (Figure 17(a) is normalized as shown in Figure 17(c), Figure 17(b) Normalization is performed as shown in Fig. 17(d)). At this time, if the smaller value is used instead of the larger value (see Fig. 17(a) to (d))...

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Abstract

When a first bar-division determination section determines that the bass note changes in a bar or when a second bar-division determination section determines that the degree of change in the chord in the bar is large, a chord-name determination section divides the bar and detects chords. This operation allows correct chords to be detected even when the chord changes within a bar, while the bass note is maintained.

Description

technical field [0001] The present invention relates to a chord name detection device and a chord name detection program. Background technique [0002] As a chord detection device for detecting a chord name (harmony name) based on a music sound signal (sound signal) in which a plurality of musical instrument sounds are mixed, such as a music CD, the present applicant has previously filed a patent application of Japanese Patent Application No. 2006-1194 . [0003] In the structure of this application, the base tone is used as a determination method when a measure is composed of a plurality of chords (harmony). That is, the bar is divided into two parts, the first half and the second half, and pitches are detected in the two parts respectively. When another pitch is detected, the chord is also divided into the first half and the second half for detection. [0004] However, in this method, when the pitch is the same but the harmony is different, for example, when the first ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10H1/00
CPCG10H1/383G10H2210/066
Inventor 澄田錬
Owner KAWAI MUSICAL INSTR MFG CO
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