Playing Apparatus Angular Rate Calculation for Accurate Tone Color
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Solution Overview
Problem
Conventional playing apparatuses fail to accurately generate musical tones of the correct tone color when the stick is swung slantwise, due to timing delays and incorrect tone color generation.
Innovation Solution
A playing apparatus equipped with a holding member, angular rate sensors, and a sound source map, which calculates the angular rate of the stick's top and presumes the direction of its turning axis to determine the correct position in a virtual space, allowing for precise sound generation based on the stick's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the playing apparatus detects acceleration in the direction opposite to the swing direction and generates sound when acceleration exceeds threshold, then sound generation timing can be determined, but a time delay occurs from the timing signal production to sound generation
Solution Approach 1:
The patent applies preliminary action by calculating the position of the stick at a predetermined time before the actual shot timing. The system uses angular rate data to predict where the stick will be at the moment of impact, then generates the sound based on this predicted position rather than the detected position, thereby compensating for the time delay in the sound generation process
Solution Approach 2:
The patent applies preliminary anti-action by anticipating the timing delay and position error in advance. The system calculates a corrected position that accounts for the predetermined time delay, effectively counteracting the expected error before it occurs, ensuring the sound is generated at the correct virtual position
2Loss of time
If the playing apparatus sets sound generation timing when angular rate falls below threshold to compensate for delay, then timing can be adjusted, but incorrect tone color is generated when the stick is swung slantwise
Solution Approach 1:
The patent applies local quality by removing the angular rate component in the longitudinal direction of the stick from the calculation. This isolates the relevant angular motion components (perpendicular to the stick) that determine the correct virtual position and tone color, while excluding the longitudinal component that would introduce errors when swinging slantwise
Solution Approach 2:
The patent applies parameter changes by modifying how angular rate is processed - specifically by removing the longitudinal component and using only the perpendicular components for position calculation. This parameter modification ensures accurate tone color selection regardless of swing direction
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 the generation of musical tones with accurate tone color corresponding to the stick's position at the correct shot timing, even when swung slantwise, by anticipating delays and correcting for angular rate changes.
Implementation Method 1
an angular rate sensor mounted on the holding member for obtaining angular rates of the holding member respectively in three axial directions
Data Source
AI summary
A sensor obtains an angular rate of a stick member. A sound source map includes plural areas disposed in a virtual space. CPU presumes a direction of a turning axis of the stick member based on the angular rate obtained by the sensor, while a user is operating the stick member, calculates an angular rate of a top of the stick member based on the angular rate obtained by the sensor with the angular rate in the longitudinal direction of the stick member removed, calculates a position of the holding member in the virtual space after a predetermined time, based on the recent direction of the turning axis of the stick member and recent angular rate of the top of the stick member, and sends a sound generating unit a note-on event of a musical tone assigned to an area corresponding to the calculated position among the plural areas.