Capacitance Sensor for Electronic Percussion Rim Shot Detection
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Solution Overview
Problem
Conventional electronic percussion instruments fail to accurately simulate the playing techniques of acoustic percussion instruments, such as open and closed rim shots, due to differences in detection methods.
Innovation Solution
The electronic percussion instrument employs a capacitance sensor system with piezoelectric elements and a self-capacitance type sensor, where electrodes are disposed to detect changes in capacitance based on the proximity of a conductor, such as a human hand, to distinguish between open and closed rim shots by determining the conductor's approach or contact with the head, thereby accurately simulating acoustic percussion techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional switches are disposed on the rim to detect rim shots, then the device structure is simple, but the measurement precision of playing technique detection is insufficient
Solution Approach 1:
The sensor system is segmented into multiple functional components: a capacitance sensor with electrode for detecting hand proximity to the head, and a piezoelectric element for detecting rim strike force. This segmentation allows each sensor to specialize in detecting specific aspects of the playing technique, thereby improving overall measurement precision without requiring a single complex sensor system.
Solution Approach 2:
The capacitance sensor acts as an intermediary between the player's hand and the detection system. By detecting changes in capacitance caused by the proximity of the conductive human body to the electrode, the system can indirectly determine whether the head is being pressed, which is essential for distinguishing closed rim shots from open rim shots without direct mechanical contact.
2Measurement precision
If multiple switches are disposed on the rim to distinguish open and closed rim shots, then the detection capability is improved, but the device complexity increases
Solution Approach 1:
The capacitance sensor with electrode serves multiple functions: it detects both the proximity of the hand to the head and the force applied during rim strikes. The piezoelectric element similarly provides multi-functional detection of mechanical strikes. This multi-functionality reduces the need for multiple specialized sensors, thereby improving detection capability while controlling device complexity.
Solution Approach 2:
The patent replaces mechanical switch systems with a combination of capacitance sensing and piezoelectric detection. The capacitance sensor uses electrical field changes rather than mechanical contact to detect hand proximity, and the piezoelectric element converts mechanical strike force directly into electrical signals. This substitution reduces mechanical complexity while improving detection accuracy.
3Measurement precision
If the capacitance sensor electrode is placed close to the head for better detection, then the measurement precision improves, but the reliability of capacitance detection deteriorates due to interference
Solution Approach 1:
The electrode is positioned at a specific location on the rim rather than being uniformly distributed, creating a localized detection zone. This local quality approach allows the electrode to be optimally positioned for detecting capacitance changes during rim shots while minimizing interference from other parts of the drum structure. The piezoelectric element is similarly positioned at the center of the rim for optimal strike detection.
Solution Approach 2:
The capacitance sensor detects changes in capacitance caused by the proximity of the conductive human body to the electrode. By using the human body itself as part of the capacitive circuit, the system achieves reliable detection without requiring direct contact or extremely close proximity, thereby maintaining both measurement precision and detection stability.
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
This solution enhances the detection accuracy of playing techniques, allowing the instrument to accurately differentiate between open and closed rim shots, improving the simulation of acoustic percussion instrument playing methods.
Implementation Method 1
A capacitance sensor includes an electrode, which generates a capacitance with respect to a detected conductor, such as a human body, located on the front surface side of the head
Implementation Method 2
A sensor part is disposed at a center of the frame and comprises a rim sensor, wherein the rim sensor is for detecting striking on the rim and is composed of a piezoelectric element
Data Source
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AI summary
Provided is an electronic percussion instrument that is capable of simulating a playing technique for an acoustic percussion instrument. A tubular body part is opened on an axial end surface, and a head is attached to the axial end surface to be struck on the front surface. A capacitance sensor includes an electrode that generates a capacitance with respect to a detected conductor, such as a human body, positioned on the front surface side of the head. Because the capacitance sensor detects a change of a capacitance corresponding to a distance between the electrode and the detected conductor, whether the detected conductor approaches (contacts) the head or presses the head can be determined. As a result, the playing technique for the acoustic percussion instrument is simulated.