Crate rill_core_wdf 

Wave Digital Filter (WDF) core — elements, adapters, and analysis for analog circuit modeling.

All types are generic over rill_core::Transcendental, supporting both f32 and f64. The SIMD module (behind the simd feature) uses the rill_core_dsp vector infrastructure.

Design

WDF elements are built around the WdfElement trait, which defines a port resistance, wave processing, and state update cycle. Elements can be combined via SeriesAdapter and ParallelAdapter to form arbitrary linear circuits. Nonlinear elements like Diode use Newton-Raphson iteration for implicit solution.

References:

• A. Fettweis, “Wave Digital Filters: Theory and Practice” (1986)
• K. J. Werner et al., “An Improved and Generalized Diode Clipper Model for Wave Digital Filters” (2015)

Modules

analysis

Frequency response and distortion analysis

filters

WDF-based filter models WDF-based filters.

Structs

Capacitor

Capacitor WDF element (trapezoidal integration)

Diode

Diode WDF element (nonlinear, Newton-Raphson solution)

Inductor

Inductor WDF element (trapezoidal integration)

ParallelAdapter

Parallel adapter — connects WDF elements in parallel

Resistor

Resistor WDF element

SeriesAdapter

Series adapter — connects WDF elements in series

WaveVariables

Wave variables: a (incident), b (reflected)

Enums

PortType

Wave port type for WDF adapters

Traits

WdfElement

Base WDF element trait