Snare Drum Position Detection via Beat Interval Analysis
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Solution Overview
Problem
Existing music piece analysis techniques fail to accurately specify the sounding positions of a snare drum due to the coexistence of various instrumental sounds in music piece data.
Innovation Solution
A music piece analyzer and analysis program that acquire a beat interval, detect sounding positions with a significant change in sound level, and determine the sounding positions of the snare drum by identifying candidates at specific intervals, such as two-beat intervals, while excluding low-frequency sounds through HPF processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the technique of Patent Literature 1 is used to extract attack sounds by subtracting amplitude data after a predetermined time from attack positions, then the processing can be simplified, but the accuracy of specifying snare drum sounding positions deteriorates due to coexistence of various instrumental sounds
Solution Approach 1:
The patent segments the music piece data into multiple frequency bands using a frequency band divider. By dividing the frequency spectrum into distinct bands (e.g., low frequency band and high frequency band), the system can process each band separately to identify snare drum attack sounds, thereby improving accuracy while managing complexity through structured decomposition
Solution Approach 2:
The patent applies different processing characteristics to different frequency bands. The high frequency band is specifically targeted for snare drum attack sound extraction using amplitude subtraction methodology, while the low frequency band is handled differently. This localized approach allows optimized processing for specific instrumental characteristics without affecting other instruments
2Adaptability or versatility
If various instrumental sounds coexist in the music piece data, then the music piece data represents real music performance, but the accuracy of specifying snare drum sounding positions deteriorates
Solution Approach 1:
The frequency band divider segments the complex audio signal into distinct frequency ranges, allowing the system to isolate snare drum attack sounds in the high frequency band from other instruments. This segmentation enables accurate snare drum detection while preserving the authenticity of the original music piece data containing multiple instruments
Solution Approach 2:
The frequency band divider acts as an intermediary between the complex music piece data and the snare drum detection process. By introducing this intermediate frequency-based separation layer, the system can extract snare drum information without eliminating other instrumental sounds, thus maintaining representativeness while achieving detection accuracy
Data Source
AI summary
A music piece analyzer includes: a beat interval acquiring unit configured to acquire a beat interval in music piece data; a candidate detector configured to detect sounding positions where a change amount for sounding is equal to or more than a predetermined threshold in the music piece data, as candidates for sounding positions of a snare drum; and a sounding position determination unit configured to determine that the candidates for the sounding positions at a two-beat interval acquired by the beat interval acquiring unit in the music piece data are the sounding positions of the snare drum, among the candidates for the sounding positions of the snare drum.