Virtual Analog Models of the Lockhart and Serge Wavefolders

Esqueda, Fabian; Pöntynen, Henri; Parker, Julian; Bilbao, Stefan

doi:10.3390/app7121328

Cited by 12 publications

(11 citation statements)

References 18 publications

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“…Convolution is also used to emulate other linear systems, such as the tonality of guitar cabinets. A review of techniques for the digital emulation of tube-based amplifiers have can be found in References [135,136].…”

Section: Digital Signal Processingmentioning

confidence: 99%

A History of Audio Effects

et al. 2020

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Audio effects are an essential tool that the field of music production relies upon. The ability to intentionally manipulate and modify a piece of sound has opened up considerable opportunities for music making. The evolution of technology has often driven new audio tools and effects, from early architectural acoustics through electromechanical and electronic devices to the digitisation of music production studios. Throughout time, music has constantly borrowed ideas and technological advancements from all other fields and contributed back to the innovative technology. This is defined as transsectorial innovation and fundamentally underpins the technological developments of audio effects. The development and evolution of audio effect technology is discussed, highlighting major technical breakthroughs and the impact of available audio effects.

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Section: Digital Signal Processingmentioning

confidence: 99%

A History of Audio Effects

et al. 2020

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“…For this work, only saturating nonlinearities are considered. Thus, the hard-clipping nonlinear shaping function is selected due to its aggressive spectral-enhancement action on the input signals [15,16,34]. The nonlinear transfer function of the hard clipper is shown in Fig.…”

Section: Performance Comparisonmentioning

confidence: 99%

Oversampling for Nonlinear Waveshaping: Choosing the Right Filters

Kahles¹,

Esqueda²,

Välimäki³

2019

J. Audio Eng. Soc.

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An assessment of filters for classic oversampled audio waveshaping schemes is carried out in this paper, pursuing aliasing reduction. For this purpose, the quality measure of the Aweighted noise-to-mask ratio is computed for test tones covering the frequency range from 27.5 Hz to 4.186 kHz, sampled at 44.1 kHz, and processed at eight-times oversampling. All filters are designed to have their passband contained within a ±1 dB range and to display a minimum stopband attenuation value of 40 dB. Waveshaping of sinusoids via hard clipping is investigated: the spectral enrichment due to the discontinuities introduced by its nonlinear transfer function maximizes aliasing distortion. The obtained results suggest that linear interpolation equalized with a high shelving filter is a sufficiently good method for upsampling. Concerning decimation, the interpolated FIR, elliptic, and cascaded integrator-comb filters all improve the results with respect to the trivial case. Regarding performance, the cascaded integrator-comb filter is the only tested decimation filter that achieves perceptually sufficient aliasing suppression for the entire frequency range when combined with the linear interpolator.

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“…Esqueda et al [5] present virtual analogue models of the Lockhart and Serge wavefolders. The input-output relationship of both circuits was digitally modeled using the Lambert-W function.…”

Section: Audio Signal Processingmentioning

confidence: 99%