Chord Judging via Tonality Segmentation and Modulation
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Solution Overview
Problem
Existing chord judging methods for musical pieces lack accuracy in identifying chords, especially when modulation occurs, and often require sufficient sounding notes within a single measure, which can be insufficient.
Innovation Solution
A chord judging method and apparatus that estimates tonality based on component tones in specified segments of varying lengths, compares these tonalities to judge chords, and utilizes modulation analysis to provide more accurate chord progression even when notes are insufficient in a single measure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If chord judging is performed based on notes within a single measure, then the judgment can be made quickly, but the accuracy deteriorates when modulation occurs or notes are insufficient
Solution Approach 1:
The patent divides the musical piece into multiple segments of varying lengths (first segment, second segment, etc.) that may overlap in time. Each segment is analyzed separately to estimate tonality, and then these segment-based tonality estimates are combined to determine the final chord judgment. This segmentation allows the system to analyze incomplete measures more effectively by using overlapping segments that collectively provide sufficient tonal information even when individual measures are insufficient.
2Measurement precision
If multiple segments of different lengths are analyzed to improve tonality estimation, then chord judgment accuracy improves, but processing time increases
Solution Approach 1:
The patent analyzes multiple segments of different lengths, including segments that extend beyond the immediate measure boundaries. This partial action approach allows the system to use overlapping segments to compensate for insufficient notes within a single measure. By analyzing segments that partially overlap in time, the system can achieve accurate tonality estimation without requiring complete analysis of the entire piece, thus balancing processing time with accuracy.
3Reliability
If the system requires sufficient sounding notes within a single measure for chord judgment, then the judgment is simpler, but it fails when modulation occurs or notes are incomplete
Solution Approach 1:
The patent segments the musical data into multiple overlapping segments of different lengths, allowing the system to analyze tonality across segment boundaries rather than being constrained to single measures. This segmentation enables reliable chord judgment even when modulation occurs or when notes are incomplete within a single measure, as the overlapping segments collectively provide sufficient tonal information.
Solution Approach 2:
The patent performs preliminary tonality estimation on multiple segments before making the final chord judgment. By estimating tonality for each segment separately and then comparing these preliminary results, the system can reliably determine chords even when individual measures lack sufficient notes or contain modulation, thus improving reliability without significantly complicating the overall operation.
Data Source
AI summary
A chord judging apparatus for judging chords of a musical piece, is provided with a processor and a memory for storing data of the musical piece, wherein the processor specifies plural segments in the data of the musical piece, estimates a tonality of each of the specified segments based on component tones included in the segment, and judges a chord of the plural segments of the musical piece based on modulation in tonality, when modulation is introduced in the estimated tonalities of the plural segments.