Signal Supply Device for Electronic Keyboard Using Acceleration-Based Sound Adjustment
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Solution Overview
Problem
Conventional electronic keyboard musical instruments fail to accurately reproduce the relationship between string striking sounds and keybed hitting sounds, which are crucial for authentic acoustic piano performance, as they do not adjust sound production timings and volumes based on key depression velocity and acceleration.
Innovation Solution
A signal supply device that generates both string striking and keybed hitting sound signals, adjusting their volumes and production timings based on calculated key depression velocity and acceleration, using a CPU and sound generator to simulate the dynamic interactions of an acoustic piano.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electronic keyboard instruments control sound intensity only by key depression velocity, then the system is simple to operate, but the sound production is unnatural and fails to distinguish between hard and soft depression
Solution Approach 1:
The patent changes the parameter used for key depression detection from velocity alone to include acceleration. By calculating acceleration from sequential velocity measurements, the system can distinguish between hard and soft depression based on the acceleration profile, enabling more natural sound production without requiring additional hardware sensors
Solution Approach 2:
The patent replaces the need for complex mechanical sensing systems with computational methods. Instead of using additional mechanical sensors to detect acceleration directly, the system substitutes mechanical measurement with mathematical calculation of acceleration from velocity data already obtained from the key depression detection mechanism
2Reliability
If acoustic piano keybed hitting sound is reproduced in electronic keyboard instruments, then the authenticity of sound is improved, but the device complexity increases due to additional sound generation requirements
Solution Approach 1:
The patent merges the generation of keybed hitting sound with the existing string striking sound production system. Both sounds are generated and adjusted within the same sound processing framework, using the same acceleration-based control mechanism, thereby reproducing authentic acoustic piano characteristics without requiring entirely separate sound generation subsystems
Solution Approach 2:
The patent makes the sound generation system universal by using a single acceleration calculation mechanism to control multiple sound types (string striking sound and keybed hitting sound). The same acceleration parameter derived from key depression detection is used to adjust both sound signals, allowing one system to serve multiple authenticating functions
3Adaptability or versatility
If the relationship between string striking sound and keybed hitting sound is adjusted based on acceleration, then the performance expression is enhanced, but the calculation and control complexity increases
Solution Approach 1:
The patent introduces dynamics to the sound production system by making the relationship between string striking sound and keybed hitting sound adjustable based on real-time acceleration measurements. The sound signals are dynamically adjusted according to the calculated acceleration value, allowing the system to adaptively reproduce different playing styles and expressions
Solution Approach 2:
The patent implements feedback by using the calculated acceleration information to adjust the sound signals. The acceleration derived from key depression detection feeds back into the sound generation process, creating a closed-loop system where the physical action of key depression directly influences the produced sound characteristics
Data Source
AI summary
A signal supply device according to an aspect of the present invention includes a generator configured to generate a first sound signal and a second sound signal in accordance with an instruction signal corresponding to an operation input to an operation body and an adjuster configured to calculate an acceleration of the operation body in accordance with the instruction signal and to adjust a relationship between the first sound signal and the second sound signal on the basis of the acceleration.