Keyboard Musical Instrument Key Position Correction
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Solution Overview
Problem
Keyboard musical instruments face challenges in maintaining accurate relative positions between keys and displacement members, such as hammers, due to manufacturing inaccuracies and part deformation, affecting sound control and detection reliability.
Innovation Solution
A keyboard musical instrument with detection units to monitor key and displacement member positions and speeds, using correction information derived from these measurements to adjust sound control, ensuring accurate sound generation and silencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detection units are used to monitor key and displacement member positions, then sound control accuracy is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by deriving correction information during a derivation mode before normal performance. The system performs detection calibration in advance, storing correction values that compensate for manufacturing deviations. This allows the detection units to achieve accurate measurements without requiring extremely high manufacturing precision, as the correction data pre-compensates for positional variations.
Solution Approach 2:
The patent changes parameters by introducing correction information that adjusts the relationship between detection unit readings and actual physical quantities. By modifying the interpretation parameters (correction values) rather than the physical detection parameters, the system achieves accurate sound control despite variations in manufacturing precision of the detection units and their relative positions.
2Reliability
If correction information is derived through detection units, then sound control reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback by using detection units to monitor actual positions and speeds, then deriving correction information that feeds back into the sound control process. The system continuously compares detection results with expected values, applies corrections based on stored correction information, and adjusts sound generation accordingly. This feedback loop significantly improves sound control reliability by compensating for detection mechanism variations.
3Measurement precision
If multiple detection units are used to detect position and speed, then measurement accuracy is improved, but ease of manufacture decreases
Solution Approach 1:
The patent introduces correction information as an intermediary that mediates between the detection units and the sound control system. Rather than requiring perfect alignment and calibration of multiple detection units during manufacturing, the correction information acts as a compensating layer that adjusts for assembly variations. This intermediary approach maintains measurement accuracy while significantly easing manufacturing and assembly processes.
Data Source
AI summary
A keyboard musical instrument is provided in which variations in the detection mechanism is corrected so that an appropriate musical sound control can be performed. Detection sections SW1, SW2, and SW3 detect an object at detection positions pSW1, pSW2, and pSW3. On the basis of a detection timing (rT2) by the detection section SW2, a detected key depression speed (V21), and a detection timing (rT3) by the detection section SW3 in a case where the key is depressed in a derivation mode, after a rST32 value is calculated, a stroke correction value calST32 is derived as correction information J and stored in a memory 57. In the performance mode, the musical sound is controlled on the basis of the detection timing by the detection sections SW1, SW2, and SW3 and the stroke correction value calST32.