Electronic Percussion Instrument With Position-Specific Thresholds
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Solution Overview
Problem
Existing electronic percussion instruments fail to account for variations in vibration characteristics at different hit positions, leading to inconsistent musical sound production when multiple positions are hit consecutively.
Innovation Solution
An electronic percussion instrument that identifies hit positions and sets threshold values individually for each position, using a gradual decrease line to ensure reliable musical sound production, preventing false detection of hits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a uniform threshold value is set for all hit positions, then the device complexity is reduced, but the measurement precision of hit detection deteriorates due to varying vibration characteristics at different positions
Solution Approach 1:
The patent applies local quality by setting different threshold values for different hit positions (bow part, edge part, cup part) based on their specific vibration characteristics. Each position has its own threshold value stored in the memory, allowing the system to account for local variations in vibration behavior rather than using a uniform threshold across all positions.
Solution Approach 2:
The patent segments the hit detection process by dividing the hitting surface into multiple distinct positions (bow part, edge part, cup part) and assigning separate threshold values to each segment. This segmentation allows independent optimization of threshold values for each position, improving overall detection accuracy despite increased complexity.
2Reliability
If a high threshold value is set to prevent false detection, then the reliability of sound production is improved, but the productivity of music sound output deteriorates due to missed valid hits
Solution Approach 1:
The patent sets different threshold values for different hit positions based on their specific vibration characteristics. Positions with naturally higher vibration levels (like the cup part) receive higher thresholds, while positions with lower vibration levels (like the bow part) receive lower thresholds. This localized approach ensures reliable sound production for each position without unnecessarily suppressing valid hits.
Solution Approach 2:
The system uses feedback from vibration sensors to detect hits and generate detection signals. The threshold values are compared against these actual vibration measurements, allowing the system to adaptively determine when a hit occurred without false detection, thereby maintaining both reliability and productivity.
3Object-generated harmful factors
If the threshold value is set high to prevent erroneous sound production, then the purity of sound output is improved, but the loss of information about valid hits increases
Solution Approach 1:
The patent addresses this contradiction by tailoring threshold values to the local vibration characteristics of each hit position. Each position's threshold is optimized for its specific vibration profile, ensuring that valid hits at each position are correctly identified while preventing erroneous sounds. This localized optimization preserves hit information across all positions simultaneously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures accurate and consistent musical sound output by adjusting threshold values based on hit position, preventing false detections and maintaining performance quality.
Implementation Method 1
a vibration sensor that can detect a hit on the hitting surface
Data Source
AI summary
An electronic percussion instrument has a plurality of hit positions, and a sound source part 10 that includes: a hit position identification part 12 identifying one of the hit positions which has been hit, based on a detection signal output from a hit detection part; a threshold value setting part 13 sets a threshold value according to the hit position identified by the hit position identification part 12; and a musical sound production part 14 produces and outputs a predetermined musical sound based on a detection signal that has exceeded the threshold value set by the threshold value setting part 13. The threshold value set by the threshold value setting part 13 forms a gradual decrease line that gradually decreases with a lapse of time, and the gradual decrease line is set individually for the hit position identified by the hit position identification part 12.