Musical Instrument Position Detection via Electromagnetic Calibration
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Solution Overview
Problem
Existing musical instruments face challenges in accurately detecting the position of movable members, such as keys, due to variations in coil positions, leading to inconsistent detection signals.
Innovation Solution
A musical instrument configuration that includes a fixed member, a movable member, a detectable circuit with a magnetic or conductive body, and a detector circuit with a coil on the fixed member, which generates position data based on detection signals and calibrates these signals using a processor to account for variations in coil distance, ensuring accurate position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the excitation coil and position detection coil are disposed on the fixed member and the excitable coil is disposed on the movable member, then the position detection system can be implemented, but the detection accuracy deteriorates due to variations in relative positions between coils
Solution Approach 1:
The patent replaces the mechanical relative positioning system with an electromagnetic field-based detection system. By using a detection coil on the fixed member and an excitable coil on the movable member, the system measures position through electromagnetic coupling rather than mechanical alignment, thereby eliminating sensitivity to mechanical position variations.
Solution Approach 2:
The patent changes the detection parameter from direct mechanical position to electromagnetic coupling characteristics. By measuring the voltage output from the detection coil that depends on the distance and coupling between coils, the system transforms position measurement into an electromagnetic parameter measurement that is less sensitive to alignment variations.
2Ease of manufacture
If the relative position between the position detection coil and the excitable coil varies, then the system can accommodate some manufacturing tolerances, but the position of the movable member cannot be accurately detected
Solution Approach 1:
The patent substitutes mechanical position measurement with electromagnetic field measurement. The detection coil measures position through electromagnetic coupling with the excitable coil, replacing the need for precise mechanical alignment and enabling accurate detection despite manufacturing tolerances in coil positioning.
Solution Approach 2:
The patent introduces an electromagnetic field as an intermediary between the fixed member and movable member. The detection coil on the fixed member detects the position of the movable member by measuring the electromagnetic coupling with the excitable coil, using the electromagnetic field as a mediator that is insensitive to mechanical alignment variations.
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 configuration improves the accuracy of movable member position detection by calibrating correspondences between voltage signals and positions, enhancing the reliability of musical instrument performance.
Implementation Method 1
a detector circuit including a coil disposed on the fixed member and configured to output a detection signal corresponding to a voltage that is dependent on a distance between the detectable circuit and the coil
Data Source
AI summary
A musical instrument includes: a fixed member; a movable member displaceable relative to the fixed member within a movable range in response to a playing operation of the musical instrument; a detectable circuit including a magnetic or conductive body and disposed on the movable member; a detector circuit including a coil disposed on the fixed member and configured to output a detection signal corresponding to a voltage that is dependent on a distance between the detectable circuit and the coil; at least one memory storing instructions; and at least one processor configured to implement the instructions to perform a plurality of tasks, including: a generating task that generates, based on correspondences between voltages of detection signals and positions of the movable member in the movable range, position data indicating a position of the movable member that depends on the voltage of the detection signal output from the detector circuit; and a calibrating task that calibrates the correspondences based on the voltage of the detection signal obtained while the movable member is at a predetermined position within the movable range.