Inertial Percussion Controller for Accurate Impact Sensing
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Solution Overview
Problem
Conventional percussion controllers have limitations such as limited dynamic range, cross-talk between sensors, time lag in processing, and a lack of reconfigurability, which restrict their ability to accurately capture a percussionist's performance and require multiple custom-designed controllers for different instruments and techniques.
Innovation Solution
A percussion controller that decouples the sensing of impact intensity and location from the struck surface using inertial navigation techniques, allowing for flexible reconfiguration of impact zones and improved dynamic range, and enabling the use of a single controller for various techniques and instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pressure- or force-detecting sensors are used in predefined impact zones, then impact sensing is achieved, but dynamic range is limited and cross-talk occurs between sensors
Solution Approach 1:
The patent replaces mechanical pressure- or force-detecting sensors with an inertial measurement unit (IMU) that uses accelerometers and gyroscopes to detect impact characteristics. This substitution eliminates the need for multiple physical sensors across the drum surface, removing cross-talk issues while expanding dynamic range through the IMU's ability to measure acceleration forces across a broader spectrum.
Solution Approach 2:
The patent introduces a processor as an intermediary that receives raw IMU data and applies signal processing algorithms to extract impact location, velocity, and force information. This intermediary layer transforms the limited raw sensor data into comprehensive impact detection capabilities, effectively expanding the system's dynamic range without adding physical sensors.
2Area of stationary object
If multiple sensors are added to increase impact zones, then sensing coverage is improved, but processing complexity increases due to cross-talk removal requirements
Solution Approach 1:
The patent replaces a multi-sensor array with a single IMU unit, dramatically reducing the number of sensors from potentially dozens to just one. This substitution eliminates the combinatorial growth in processing complexity that would be required to remove cross-talk between multiple adjacent sensors.
Solution Approach 2:
The single IMU unit performs multiple functions that would otherwise require multiple sensors: it detects impact location, impact force, impact velocity, and even strike direction. This multi-functionality consolidates what would be a complex multi-sensor system into a single versatile sensor unit.
3Measurement precision
If conventional sensor processing is used, then impact detection is achieved, but time lag occurs in signal processing
Solution Approach 1:
The patent implements preliminary action by continuously sampling and pre-processing IMU data before an impact occurs. The system maintains a rolling buffer of acceleration and orientation data, so when an impact is detected, the processing algorithm can immediately analyze pre-captured data without waiting for post-impact sensor readings, significantly reducing time lag.
Solution Approach 2:
The patent replaces conventional pressure sensors that require mechanical deformation and signal amplification with an IMU that provides direct digital acceleration measurements. This substitution eliminates mechanical processing delays and enables faster digital signal processing.
4Measurement precision
If custom-designed controllers are used for different instruments and techniques, then instrument-specific performance is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements a universal controller design where a single IMU-based system can detect and differentiate between various drum types (snare, tom, floor tom), cymbals, and different playing techniques. The processor uses algorithmic differentiation based on impact characteristics rather than dedicated sensors for each instrument, providing instrument-specific accuracy through software configuration rather than hardware customization.
Solution Approach 2:
The patent applies dynamics by making the controller's impact zones and detection parameters reconfigurable through software rather than fixed hardware. The system can dynamically adjust sensitivity thresholds, impact zone boundaries, and detection algorithms to optimize performance for different instruments and playing styles without requiring physical reconfiguration or multiple dedicated devices.
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 approach reduces cross-talk, eliminates time lag, and allows for a single controller to adapt to different techniques and instruments, enhancing the accuracy and versatility of percussion performance.
Implementation Method 1
obtaining information pertaining to kinetics of the drumstick as the drumstick is being thrown by the performer using inertial navigation techniques
Implementation Method 2
predicting a force of impact of the drumstick on the drum surface and a location of the impact on the drum surface before the drumstick actually strikes the drum surface
Data Source
AI summary
A percussion controller comprises an instrumented striker including devices for obtaining inertial measurements and a wireless transmitter, a sensor-enabled striking surface that receives an impact from the instrumented striker, and a data processing system that receives the inertial measurements and predicts at least one of the force or location of impact of the instrumented striker on the sensor-enabled striking surface before impact actually occurs.