Filter Effect Device Dynamic Coefficient Retention
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Solution Overview
Problem
Existing electronic musical instruments can only switch between two filter characteristics, limiting their ability to effectively change filter characteristics.
Innovation Solution
A filter effect imparting device and electronic musical instrument that includes a characteristic-variable filter and a control circuit. The control circuit changes filter coefficient groups from a start point to an end point, retaining the coefficients during the change and setting the retained group as the new start point for subsequent changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If envelope signals are changed in a predetermined range, then the electronic musical instrument can be changed only between two filter characteristics, but the filter characteristics cannot be switched more effectively
Solution Approach 1:
The patent introduces a dynamic retention mechanism where the control circuit retains the current coefficient group during transition and uses it as the new start point for subsequent changes. This dynamic adjustment allows the filter characteristics to be switched more effectively by maintaining continuity and enabling multi-step transitions within a predetermined range, rather than being limited to fixed two-point switching.
2Adaptability or versatility
If the control circuit changes coefficient groups from start point to end point, then filter characteristics can be switched, but the complexity of control increases
Solution Approach 1:
The control circuit automatically retains the current coefficient group during transition and uses it as the new start point for subsequent changes. This self-service mechanism eliminates the need for manual intervention or complex external control logic, allowing the system to manage its own state transitions efficiently while maintaining adaptability in filter characteristic switching.
Data Source
AI summary
A filter effect imparting device includes a characteristic-variable filter that has a variable filter characteristic corresponding to a coefficient group composed of a plurality of filter coefficients, and a control circuit that changes the coefficient group from a first coefficient group that is set as a start point to a second coefficient group that is set as an end point. The control circuit retains the coefficient group during the change and, in newly setting a third coefficient group as the end point, the control circuit sets the retained coefficient group as the start point.