Kurt James Werner
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View article: A Workflow and Digital Filters for Correcting Speed and Equalization Errors on Digitized Audio Open-Reel Magnetic Tapes
A Workflow and Digital Filters for Correcting Speed and Equalization Errors on Digitized Audio Open-Reel Magnetic Tapes Open
This paper presents a workflow and digital filters for compensating speed and equalization errors that can impact digitized audio open-reel tapes. Thirty cases of mismatch between recording and reproducing speed (3.75, 7.5, 15, and 30 in/s…
View article: Energy-Preserving Time-Varying Schroeder Allpass Filters and Multichannel Extensions
Energy-Preserving Time-Varying Schroeder Allpass Filters and Multichannel Extensions Open
We propose time-varying Schroeder allpass filters and Gerzon allpass reverberators that remain energy preserving irrespective of arbitrary variation of their allpass gains or feedback matrices over time.We propose various ways of realizing…
View article: Lightweight and Interpretable Neural Modeling of an Audio Distortion Effect Using Hyperconditioned Differentiable Biquads
Lightweight and Interpretable Neural Modeling of an Audio Distortion Effect Using Hyperconditioned Differentiable Biquads Open
In this work, we propose using differentiable cascaded biquads to model an audio distortion effect. We extend trainable infinite impulse response (IIR) filters to the hyperconditioned case, in which a transformation is learned to directly …
View article: Generalized Wave Digital Filter Realizations of Arbitrary Reciprocal Connection Networks
Generalized Wave Digital Filter Realizations of Arbitrary Reciprocal Connection Networks Open
In this paper, an existing approach for modeling and efficiently implementing arbitrary reciprocal connection networks using wave digital (WD) scattering junctions based on voltage waves is extended to be used in a broader class of WD filt…
View article: Modeling Circuits With Arbitrary Topologies and Active Linear Multiports Using Wave Digital Filters
Modeling Circuits With Arbitrary Topologies and Active Linear Multiports Using Wave Digital Filters Open
The wave digital filter (WDF) technique derives digital filters from analog prototypes that classically have been restricted to passive circuits with series/parallel topologies. Since most audio circuits contain active elements (e.g., op-a…
View article: Wave Digital Modeling of the Diode-Based Ring Modulator
Wave Digital Modeling of the Diode-Based Ring Modulator Open
The ring modulator is a strongly nonlinear circuit common in audio gear, especially as part of electronic musical instruments. In this paper, an accurate model based on Wave Digital (WD) principles is developed for implementing the ring mo…
View article: Sinusoidal Parameter Estimation Using Quadratic Interpolation around Power-Scaled Magnitude Spectrum Peaks
Sinusoidal Parameter Estimation Using Quadratic Interpolation around Power-Scaled Magnitude Spectrum Peaks Open
The magnitude of the Discrete Fourier Transform (DFT) of a discrete-time signal has a limited frequency definition. Quadratic interpolation over the three DFT samples surrounding magnitude peaks improves the estimation of parameters (frequ…
View article: Modeling nonlinear wave digital elements using the Lambert function
Modeling nonlinear wave digital elements using the Lambert function Open
A large class of transcendental equations involving exponentials can be made explicit using the Lambert W function. In the last fifteen years, this powerful mathematical tool has been extensively used to find closed-form expressions for cu…
View article: Modal Processor Effects Inspired by Hammond Tonewheel Organs
Modal Processor Effects Inspired by Hammond Tonewheel Organs Open
In this design study, we introduce a novel class of digital audio effects that extend the recently introduced modal processor approach to artificial reverberation and effects processing. These pitch and distortion processing effects mimic …