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

constants

Physical constants and tolerances Physical constants and numerical tolerances used throughout the crate.

filters

WDF-based filter models WDF-based filters.

macros

WDF eDSL macros for defining elements and filters

Macros

wdf_cascade

wdf_compose

Compose two WDF elements into Series or Parallel.

wdf_element

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

Transcendental

Трансцендентные операции (sin, cos, sqrt, exp, ln).

WdfElement

Base WDF element trait