Partial Filter Crossfading for Smooth Reverb Characteristic Switching
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Solution Overview
Problem
Existing effect providing devices for electronic instruments face unnatural transitions when changing filter characteristics, such as reverberation effects, leading to audible discontinuities during reverb type switching.
Innovation Solution
A filter characteristics changing device and method that employs crossfading processing between multiple partial filters, gradually decreasing the contribution of one filter and increasing the contribution of another to smoothly transition between different reverberation characteristics, using a processor to manage the fade-out and fade-in processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If filter characteristics are changed directly without crossfading, then the switching speed is fast and response is immediate, but unnatural transitions and audible discontinuities occur
Solution Approach 1:
The patent introduces a crossfading mechanism as an intermediary process between direct filter switching. Multiple partial filters are used with varying degrees of contribution, where the transition from one filter characteristic to another is mediated through gradual adjustment of contribution degrees, eliminating abrupt transitions while maintaining reasonable switching speed
Solution Approach 2:
The patent makes the filter system dynamic by allowing the degree of contribution of each partial filter to change over time during transitions. Instead of static filter switching, the system dynamically adjusts the contribution weights of multiple filters to achieve smooth transitions while maintaining operational responsiveness
2Object-affected harmful factors
If crossfading processing is implemented between multiple partial filters, then natural transitions are achieved and unnaturalness is eliminated, but the device complexity increases
Solution Approach 1:
The patent segments the overall filter function into multiple partial filters, each handling a portion of the filtering task. This segmentation allows independent control and gradual transition of each partial filter's contribution, achieving smooth overall transitions while keeping individual filter components relatively simple and manageable
Solution Approach 2:
The patent creates a multi-functional filter system where multiple partial filters work together to provide both the original filter characteristic and the transitioning characteristic. The same partial filters serve multiple purposes: maintaining current characteristics, enabling transitions, and providing target characteristics, thereby reducing the need for entirely separate filter sets
Data Source
AI summary
When an instruction is provided for changing a characteristic of a set filter which includes a plurality of partial filters and forms a specified characteristic by combining a plurality of partial filters, a processor performs, as crossfading processing for a first filter and a second filter among the plurality of partial filters, fade-out processing of gradually decreasing a degree of contribution of the first filter to the characteristic and fade-in processing of gradually increasing a degree of contribution of the second filter to the characteristic. As a result, unnaturalness occurring at the time of changing filter characteristics is solved.