Resonance Sound Control Device Using Multi-Stage Switches
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Solution Overview
Problem
Existing electronic piano systems fail to accurately reproduce the intermediary resonance state of strings when keys are pressed partially, as they rely on the note-on state and do not account for key pressing depth, which is crucial for simulating the resonance dynamics of an acoustic piano.
Innovation Solution
A resonance sound control device with a multi-stage switch section and resonance circuit that controls the resonance sound by the open/close state of switches, allowing for the reproduction of intermediary and perfect resonance states, and considers the stepped-down states of the damper and sostenuto pedals to enhance resonance simulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the note-on state is used as the object of string resonance, then the resonance process is simple to implement, but it cannot reproduce intermediary resonance states that occur during partial key pressing
Solution Approach 1:
The key pressing action is segmented into multiple discrete stages using a multi-stage switch section with N switches. Each switch corresponds to a specific pressing depth threshold, allowing the system to distinguish between different phases of key depression (from initial contact to full press). This segmentation enables selective application of resonance effects at different pressing stages, accurately reproducing intermediary resonance states while maintaining clear control logic.
2Measurement precision
If key pressing depth information is utilized to control resonance, then intermediary resonance states can be reproduced, but the control system becomes more complex
Solution Approach 1:
A multi-stage switch section serves as an intermediary device between the key pressing action and the resonance control system. The switch section contains N switches arranged in series, where each switch closes at a specific pressing depth threshold. This intermediary structure converts the continuous key pressing motion into discrete control signals that can be processed by the resonance control section, simplifying the overall control architecture while enabling precise resonance state management.
Solution Approach 2:
The resonance control system dynamically adjusts the resonance effect based on the real-time state of the multi-stage switch section. As the key is pressed and switches close sequentially, the resonance control section activates different resonance parameters corresponding to each switch state. This dynamic adaptation allows the system to reproduce the evolving resonance characteristics that occur during the key pressing process, from initial contact through to full depression.
3Measurement precision
If multiple switches are used to detect key pressing stages, then intermediary resonance states can be captured, but the number of components increases
Solution Approach 1:
The multi-stage switch section merges multiple switching elements into a unified control structure that works together with the resonance control section. Rather than treating each switch as an independent component, the system integrates them into a sequential detection mechanism where the combined state of all N switches provides comprehensive information about key pressing depth. This merging approach enables precise multi-stage detection while maintaining a cohesive and manageable component architecture.
Data Source
AI summary
In an electronic piano including plural keys and a sound source device (sound emission section) that emits a sound by pressing of the key, an intermediary resonance state of a resonance sound can be reproduced by including a resonance circuit that inputs a sound source from the sound source device corresponding to the each key and outputs a resonance sound, a position detection sensor (multi-stage switch section) in which plural switches close sequentially according to a key pressing state of the key, and a resonance sound control device that controls the resonance sound by an open/close state of plural switches by the position detection sensor.