Piano Resonance Signal Generation Using Duplex Loop Processing
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Solution Overview
Problem
Conventional methods for electronically simulating the sound of a piano fail to reproduce the reverberation effects contributed by the front and rear duplexes of piano strings, which are essential for an authentic piano sound, especially during Staccato playing.
Innovation Solution
A resonance signal generating method and device that include separate loop processing for simulating the resonance frequencies of speaking lengths and duplexes, using delay and attenuation circuits to generate and combine resonance signals that mimic the vibration and energy propagation of piano strings, including those of the front and rear duplexes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional loop processing is used to simulate resonance of speaking lengths, then resonance sound of speaking lengths can be generated, but resonance sound of duplexes (front and rear) cannot be reproduced
Solution Approach 1:
The patent divides the resonance simulation into separate processing paths: one for speaking lengths and another for duplexes. The speaking length resonance is handled by conventional loop processing, while the duplex resonance is handled by additional loop processing that specifically targets the front and rear duplex components, allowing each to be simulated independently and accurately
Solution Approach 2:
The patent adds a new dimension to the resonance simulation by introducing duplex-specific loop processing alongside the existing speaking length processing. This creates a multi-dimensional resonance generation system that simultaneously handles speaking lengths, front duplex, and rear duplex, expanding the coverage from single-component to multi-component resonance simulation
2Reliability
If delay amount is set to simulate resonance of speaking length, then resonance frequency of speaking length can be enhanced, but reverberation of duplexes cannot be reproduced
Solution Approach 1:
The patent segments the resonance simulation into distinct processing paths with separate delay amounts: one delay amount for speaking length resonance and another delay amount for duplex resonance. This allows each component to be simulated with its specific acoustic characteristics, including the reverberation effects of the duplexes
Solution Approach 2:
The patent changes the delay amount parameter to differentiate between speaking length resonance and duplex resonance. By using different delay amounts for different string components, the system can accurately reproduce the distinct resonance frequencies and reverberation characteristics of each component
3Device complexity
If single loop processing is used, then processing complexity is low, but completeness of string component simulation is insufficient
Solution Approach 1:
The patent segments the resonance generation into multiple independent loop processing paths: one for speaking lengths and another for duplexes. Each path can be implemented with standard resonance generation circuits, so while the overall system is more complex, each individual component uses conventional, well-understood circuitry
Solution Approach 2:
The patent merges the speaking length resonance output and duplex resonance output into a single combined output signal. This allows the system to maintain the completeness of multi-component simulation while presenting a unified output that can be directly used in musical instrument applications without requiring separate processing paths for each component
Data Source
AI summary
A resonance signal generating method includes generating a first resonance signal of a first pitch circulating through first loop processing by inputting a first excitation signal to the first loop processing including first delay that delays the signal by a time corresponding to the first pitch and first attenuation that attenuates the signal, the first pitch being a pitch having a resonance frequency of a predetermined speaking length of a piano, generating a second resonance signal of a second pitch circulating through second loop processing by inputting a second excitation signal to the second loop processing including second delay that delays the signal by a time corresponding to the second pitch and second attenuation that attenuates the signal, the second pitch not being a pitch having a resonance frequency of any of speaking lengths of the piano or a pitch of a harmonic thereof but being higher than the first pitch, and outputting the first resonance signal circulating through the first loop processing and the second resonance signal circulating through the second loop processing.