Electronic Drum RF Sensing for Precise Hit Position Detection
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Solution Overview
Problem
Existing electronic drums lack accurate position and velocity sensing capabilities, leading to limited sound differentiation and responsiveness, often requiring multiple sensors and complex manufacturing processes.
Innovation Solution
A signal processor configured to analyze RF signals from a single or multiple drum sensors to determine the position, velocity, and intensity of hits on an electronic drum head, allowing for precise sound assignment and enhanced responsiveness with a simpler sensor configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are used to improve position and velocity sensing accuracy, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent implements a single drum sensor that performs multiple functions: detecting both position and velocity of drum head strikes, and providing information for multiple sound assignments. This multi-functional sensor eliminates the need for multiple separate sensors while maintaining comprehensive detection capabilities, directly resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent changes the operational parameters of the drum sensor by analyzing different characteristics of the RF signal (amplitude, frequency, phase) to extract both position and velocity information from a single sensor. This parameter-based differentiation allows one sensor to provide the measurement precision previously requiring multiple sensors, while avoiding the complexity increase
2Measurement precision
If multiple sensors are deployed to enable accurate position sensing across the drum head, then measurement precision is improved, but manufacturing precision and production complexity increase
Solution Approach 1:
The patent extracts the position sensing capability from multiple distributed sensors and consolidates it into a single sensor system. By taking out the position detection function from the multi-sensor architecture and implementing it through signal analysis in a single sensor, the manufacturing precision requirements for sensor placement and calibration are significantly reduced
Solution Approach 2:
The patent creates a virtual representation of the drum head surface through RF signal analysis from a single sensor, effectively copying the spatial information that would otherwise require multiple physical sensors. This virtual mapping approach achieves accurate position sensing without the manufacturing complexity of precisely placing and calibrating multiple physical sensors across the drum head surface
3Ease of manufacture
If a single sensor is used to reduce device complexity, then ease of manufacture is improved, but measurement precision and sound differentiation capability deteriorate
Solution Approach 1:
The patent implements dynamic signal processing that adapts to different strike positions and velocities on the drum head. The single sensor dynamically analyzes RF signal characteristics to extract precise position and velocity information, maintaining measurement precision while keeping the physical sensor configuration simple and easy to manufacture
Solution Approach 2:
The patent introduces signal processing algorithms as an intermediary between the single sensor and the sound generation system. This intermediary layer extracts detailed position and velocity information from the RF signals, enabling accurate measurement precision and sound differentiation with only one physical sensor, thus maintaining ease of manufacture
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
Enables accurate position sensing and responsive electronic drum performance with fewer sensors, allowing for various sound characteristics across the drum head and improved manufacturing efficiency, while maintaining durability and temperature stability.
Implementation Method 1
The passive resonant circuit is inductively coupled to the active resonant circuit, providing a signal which varies as the mutual separation of the active tuned resonant circuit and the passive tuned resonant circuit is varied.
Data Source
Figure 1a~1b
Figure 2
Figure 3a~3b
AI summary
An electronic drum, comprising: a bottom member; a drumhead; a drum sensor comprising: a passive resonant circuit mounted on the drum head and having a resonant frequency; and an active resonant circuit mounted on the bottom member and configured to excite the passive resonant circuit at the resonant frequency; a sensor driver to drive the active resonant circuit with an RF drive signal at the resonant frequency; and a detector to detect a level of RF signal from the driven active resonant circuit for sensing a position and/or velocity of the drum head; and a signal processor, coupled to the detector, configured to process the detected level of RF signal to sense a position and/or velocity of the drum head for determining when the drum head is hit.