Electronic Keyboard Signal Processing for Dynamic Sound
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Solution Overview
Problem
Existing electronic piano technologies require separate sampling of hammer string hitting sound and key bed impact sound waveform data, limiting the ability to dynamically adjust sounds generated in response to user operations.
Innovation Solution
An electronic keyboard instrument that stores both string hitting sound and key bed impact sound waveform data in a single memory, allowing for real-time adjustment of sound generation through a control unit that processes key depression velocity and acceleration to adjust the gain of the key bed impact sound component, enabling dynamic sound variation without pre-sampling each sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate sampling of hammer string hitting sound and key bed impact sound is performed, then sound accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines the hammer string hitting sound and key bed impact sound into a single composite sound waveform stored in one waveform memory. This merging approach maintains sound accuracy by preserving both sound components while reducing device complexity by eliminating the need for separate waveform memories and separate sampling systems for each sound type.
2Measurement precision
If separate sampling of each sound is performed, then sound quality is improved, but ease of operation deteriorates
Solution Approach 1:
The patent implements dynamic control of the key bed impact sound component by varying its gain based on detected key depression acceleration. This allows the system to automatically adjust the mixture of hammer string hitting sound and key bed impact sound in real-time based on playing intensity, maintaining high sound quality while simplifying operation as the user only needs to play naturally without manually adjusting sound parameters.
3Adaptability or versatility
If separate sampling of each sound is performed, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent achieves adaptability by dynamically changing the gain parameter of the key bed impact sound component based on key depression acceleration. This allows the single composite waveform system to adapt to different playing intensities and styles, providing versatile sound expression without requiring multiple separate waveform memories or complex sampling systems for each sound variant.
Data Source
AI summary
A signal processing method according to an embodiment of the present disclosure includes outputting a second sound signal by varying a level of a portion of a band of a first sound signal based on a second parameter corresponding to a displacement of each of a plurality of operators, the first sound signal being identified by a first parameter corresponding to the displacement, the second parameter being different from the first parameter.