Drumstick Orientation Detection via Sensor Fusion
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Solution Overview
Problem
Existing virtual musical performance devices face accuracy issues in estimating the orientation of a drumstick-shaped member when moved at high speeds due to the combination of gravity and external forces, limiting the number of sound sources that can be placed and degrading sound emission accuracy.
Innovation Solution
An orientation detection device equipped with a triaxial acceleration sensor, angular velocity sensor, and geomagnetic sensor, which corrects the gravity direction by updating orientation parameters based on angular velocity and accumulating accelerations to improve orientation estimation accuracy, allowing for more precise sound emission timing and volume control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If acceleration sensor is used to detect gravity direction for sound source placement, then the number of sound sources can be increased beyond horizontal direction limits, but gravity direction cannot be specified when drumstick is moved at high speed, degrading orientation estimation accuracy
Solution Approach 1:
The patent combines data from multiple sensors (acceleration sensor, angular velocity sensor, and geomagnetic sensor) to determine drumstick orientation. This sensor fusion approach allows the system to maintain accurate orientation estimation even during high-speed movement when acceleration alone is insufficient, while still enabling versatile sound source placement in multiple directions.
Solution Approach 2:
The patent introduces an intermediary processing mechanism that separates gravity detection from motion detection. By using the angular velocity sensor to detect motion and the geomagnetic sensor to provide reference orientation, the system can accurately determine gravity direction relative to the drumstick even during high-speed movement, enabling accurate orientation estimation and multiple sound source placement.
2Measurement precision
If geomagnetic sensor is used to determine drumstick orientation, then different musical sounds can be emitted according to orientation, but sound sources can be placed only in horizontal direction, limiting maximum number of sound sources to three or four
Solution Approach 1:
The patent merges the capabilities of geomagnetic sensor (for accurate horizontal orientation detection) with acceleration sensor and angular velocity sensor (for vertical and dynamic orientation detection). This combination enables the system to detect orientation in three-dimensional space, allowing sound sources to be placed in multiple directions including vertical and diagonal orientations, thereby increasing the number of available sound sources beyond the horizontal limitation.
3Adaptability or versatility
If acceleration sensor detects playing motion for virtual musical performance, then musical sound can be emitted without real instrument, but gravity combines with external force to become resultant force, preventing gravity direction specification during high-speed movement
Solution Approach 1:
The patent segments the orientation detection function across three different sensors, each responsible for detecting specific components of motion and orientation. The acceleration sensor detects linear acceleration, the angular velocity sensor detects rotational motion, and the geomagnetic sensor provides reference orientation. This segmentation allows the system to maintain virtual performance capability while accurately determining gravity direction by combining information from all three sensors.
Solution Approach 2:
The patent uses the angular velocity sensor as an intermediary to distinguish between gravity-induced acceleration and motion-induced acceleration. By detecting angular velocity, the system can identify rotational movements and separate them from the gravity vector, enabling accurate gravity direction specification even during high-speed movement while maintaining virtual performance capability.
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
Enhances the accuracy of orientation estimation and sound emission, enabling the placement of multiple sound sources and improving the overall musical performance experience by accurately detecting the drumstick's orientation and motion.
Implementation Method 1
an acceleration sensor which detects acceleration occurring in each direction of three axes of the holding member which are orthogonal to each other
Implementation Method 2
an angular velocity sensor which detects angular velocity centering on each of the three axes which are orthogonal to each other
Data Source
AI summary
In the preset invention, in an initial stationary state of a drumstick section, a CPU stores acceleration that occurs due to gravity and is obtained by an acceleration sensor in a RAM, obtains, at every predetermined timing, acceleration that occurs due to a motion provided to the drumstick section and is obtained by the acceleration sensor at a predetermined timing, accumulates the accelerations each obtained at the predetermined timing for each predetermined interval, and conforms the accelerations obtained by accumulation to the acceleration stored in the RAM.