Feedback Loop Resonator for Multi-Pitch Synthesis
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Solution Overview
Problem
Existing electronic musical instruments face challenges in generating resonance sounds efficiently without increasing circuit size, as they require multiple resonators and string models, leading to anomalous oscillation and high computational loads when simulating multiple pitches.
Innovation Solution
The implementation of a feedback loop configuration in an electronic musical instrument, where output signals from string models are integrated, inverted, and fed back into the loop, allowing for the generation of resonance sounds without additional computational resources and reducing anomalous oscillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple resonators and string models are provided to simulate multiple pitches, then resonance sound quality is improved, but circuit size and device complexity increase significantly
Solution Approach 1:
A single resonator is designed to serve multiple functions by simulating resonance for multiple pitches through feedback loops. The resonator processes excitation signals for different pitches (e.g., C4, C5, C6) and generates appropriate resonance sounds without requiring separate physical resonators for each pitch, thus reducing circuit complexity while maintaining sound quality.
Solution Approach 2:
Feedback loops are implemented to feed the output signal back to the input of the resonator with appropriate timing and attenuation. This allows the resonator to simulate the vibration characteristics of strings for multiple pitches by continuously processing the signal through the feedback path, enabling one resonator to replace multiple resonators and significantly reducing device complexity.
2Reliability
If multiple string models are used to achieve accurate resonance simulation, then sound realism is improved, but computational load increases
Solution Approach 1:
Multiple string model functions are merged into a single resonator implementation. The resonator handles excitation signals for multiple pitches and combines the resonance simulation for C4, C5, C6 and other pitches in one computational path, reducing the total computational load while maintaining sound realism through the feedback mechanism.
Solution Approach 2:
The system changes parameters such as feedback amount and attenuation coefficients based on the input pitch to simulate different string vibrations. By dynamically adjusting these parameters, a single resonator can accurately simulate the behavior of multiple string models with different pitches, reducing computational requirements while preserving sound realism.
3Stability of the object's composition
If feedforward connection is used for resonators, then resonance stability is improved, but the ability to simulate multiple pitches simultaneously is limited
Solution Approach 1:
Feedback loops are introduced to enable the resonator to process multiple pitches simultaneously while maintaining stability. The feedback path allows the resonator to continuously adjust its response based on the input signal characteristics, enabling stable resonance simulation for C4, C5, C6 and other pitches to be played together without the limitations of feedforward connections.
Data Source
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AI summary
According to one aspect, there is an electronic musical instrument including operators (11) which includes a first operator corresponding to a first pitch and a second operator corresponding to a second pitch, and a sound source (12D) configured to generate a first output signal from a first close loop (36A to 40A) and a second output signal from a second close loop, to generate an integration signal, and return (41A) a subtraction signal, the subtraction signal being obtained by subtracting (46A) a signal circulating through the first close loop (36A to 40A) from the integration signal, to the first close loop, and then output a musical sound signal including signal components corresponding to the second pitch as a musical sound signal corresponding to the first pitch.