Keyboard Instrument Sound Signal Attenuation Control
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Solution Overview
Problem
Current electronic piano technologies fail to accurately replicate the sound attenuation effects of an acoustic piano's damper pedal, leading to unnatural reverberation and difficulty in emphasizing melodies, as they do not consider the varying effectiveness of the damper on different strings.
Innovation Solution
A sound signal generation device with a processor that generates sound signals based on key and pedal operation data, using an attenuation control task to vary the attenuation velocity of the sound signal according to the operation velocity of the key and the state of the damper pedal, mimicking the acoustic piano's damper effects by adjusting the decay rate of the sound signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed attenuation velocity is used for all keys, then the control is simple, but the sound does not accurately reflect the damper's varying influence on different strings
Solution Approach 1:
The patent applies local quality by assigning different attenuation velocities to different keys based on their individual characteristics. Each key's sound signal is attenuated at a velocity that reflects the damper's specific influence on that string, rather than using a uniform attenuation rate for all keys. This creates locally optimized sound reproduction that matches the physical behavior of an acoustic piano.
Solution Approach 2:
The patent implements dynamics by making the attenuation velocity variable rather than fixed. The attenuation control unit dynamically adjusts the attenuation velocity for each key based on operation data, allowing the system to adaptively reproduce the damper's varying effects. This dynamic approach captures the nuanced behavior of real piano dampers that exert different forces on different strings.
2Productivity
If the attenuation velocity is increased to reduce reverberation, then melodic emphasis improves, but the sound becomes unnatural and loses acoustic piano characteristics
Solution Approach 1:
The patent applies local quality by allowing different keys to have different attenuation velocities tailored to their specific characteristics and musical context. This enables selective emphasis of melodic lines through higher attenuation velocities for certain keys while maintaining natural decay for others, achieving both melodic emphasis and natural sound reproduction simultaneously.
Solution Approach 2:
The patent implements parameter changes by varying the attenuation velocity parameter based on multiple factors including key position, operation data, and desired musical effect. This flexible parameter adjustment allows the system to optimize both melodic emphasis and naturalness by changing the attenuation velocity parameter adaptively rather than using a fixed value.
Data Source
AI summary
A sound signal generation device according to one embodiment includes a memory storing instructions, and a processor that implements the instructions and execute a plurality of tasks, including a signal generation task that generates a sound signal based on first operation data corresponding to an operation to a key, and an attenuation control task that controls an attenuation velocity of the sound signal to one of a first velocity or a second velocity that is faster than the first velocity, based on the first operation data, and second operation data corresponding to an operation to a pedal, wherein the attenuation control task varies a value of the second velocity based on an operation velocity of the key included in the first operation data to control the attenuation velocity of the sound signal to the second velocity.