Julius O. Smith
YOU?
Author Swipe
View article: Aliasing Reduction in Neural Amp Modeling by Smoothing Activations
Aliasing Reduction in Neural Amp Modeling by Smoothing Activations Open
The increasing demand for high-quality digital emulations of analog audio hardware, such as vintage tube guitar amplifiers, led to numerous works on neural network-based black-box modeling, with deep learning architectures like WaveNet sho…
View article: A Comparison of Modal Parameter Extraction Methods When Applied to Measurements of Stringed Instruments
A Comparison of Modal Parameter Extraction Methods When Applied to Measurements of Stringed Instruments Open
Modal testing is a commonly used method to measure the transfer function or frequency response function of musical instruments or their components.Various excitation and measurement tools are used, and the recorded signals are analyzed to …
View article: SCATTERING PARAMETERS FOR THE KEEFE CLARINET TONEHOLE MODEL
SCATTERING PARAMETERS FOR THE KEEFE CLARINET TONEHOLE MODEL Open
The clarinet tonehole model developed by Keefe [1981] is parametrized as the cascade of a series reactance, a shunt complex impedance, and another series reactance. The transmission matrix description of this two-port tonehole model is giv…
View article: A landmark article on nonlinear time-domain modeling in musical acoustics
A landmark article on nonlinear time-domain modeling in musical acoustics Open
The Reflections series takes a look back on historical articles from The Journal of the Acoustical Society of America that have had a significant impact on the science and practice of acoustics.
View article: A Framework for Generative and Contrastive Learning of Audio Representations
A Framework for Generative and Contrastive Learning of Audio Representations Open
In this paper, we present a framework for contrastive learning for audio representations, in a self supervised frame work without access to any ground truth labels. The core idea in self supervised contrastive learning is to map an audio s…
View article: A Framework for Contrastive and Generative Learning of Audio Representations.
A Framework for Contrastive and Generative Learning of Audio Representations. Open
In this paper, we present a framework for contrastive learning for audio representations, in a self supervised frame work without access to any ground truth labels. The core idea in self supervised contrastive learning is to map an audio s…
View article: A Spatial Sampling Approach to Wave Field Synthesis: PBAP and Huygens Arrays
A Spatial Sampling Approach to Wave Field Synthesis: PBAP and Huygens Arrays Open
A simple approach to microphone- and speaker-arrays is described in which the microphone array is regarded as a sampling grid for the acoustic field, and the corresponding speaker-array is treated as a "spatial digital to analog converter"…
View article: A Spatial Sampling Approach to Wave Field Synthesis: PBAP and Huygens\n Arrays
A Spatial Sampling Approach to Wave Field Synthesis: PBAP and Huygens\n Arrays Open
A simple approach to microphone- and speaker-arrays is described in which the\nmicrophone array is regarded as a sampling grid for the acoustic field, and the\ncorresponding speaker-array is treated as a "spatial digital to analog\nconvert…
View article: SUPRA: Digitizing the Stanford University Piano Roll Archive
SUPRA: Digitizing the Stanford University Piano Roll Archive Open
This paper describes the digitization process of a large collection of historical piano roll recordings held in the Stanford University Piano Roll Archive (SUPRA), which has resulted in an initial dataset of 478 performances of pianists fr…
View article: Converting Series Biquad Filters Into Delayed Parallel Form: Application to Graphic Equalizers
Converting Series Biquad Filters Into Delayed Parallel Form: Application to Graphic Equalizers Open
Digital filter transfer functions can be converted between the direct form and parallel connections of elementary sections, typically second-order ('biquad') sections. The conversion from direct to parallel form is performed using a partia…
View article: Virtual acoustic rendering by state wave synthesis
Virtual acoustic rendering by state wave synthesis Open
In the context of the class of virtual acoustic simulation techniques that rely on traveling wave rendering as dictated by path-tracing methods (e.g, image-source, ray-tracing, beam-tracing) we introduce State Wave Synthesis (SWS), a novel…
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 sound scattering using a combination of the edge source integral equation and the boundary element method
Modeling sound scattering using a combination of the edge source integral equation and the boundary element method Open
A hybrid method for sound scattering calculations is presented in this paper. The boundary element method (BEM) is combined with a recently developed edge source integral equation (ESIE) [J. Acoust. Soc. Am. 133, 3681–3691 (2013)]. Althoug…
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: Neural Style Transfer for Audio Spectograms
Neural Style Transfer for Audio Spectograms Open
There has been fascinating work on creating artistic transformations of images by Gatys. This was revolutionary in how we can in some sense alter the 'style' of an image while generally preserving its 'content'. In our work, we present a m…
View article: FAUST2SMARTKEYB: A TOOL TO MAKE MOBILE INSTRUMENTS FOCUSING ON SKILLS TRANSFER IN THE FAUST PROGRAMMING LANGUAGE
FAUST2SMARTKEYB: A TOOL TO MAKE MOBILE INSTRUMENTS FOCUSING ON SKILLS TRANSFER IN THE FAUST PROGRAMMING LANGUAGE Open
In this paper, we present faust2smartkeyb, a tool to create musical apps for Android and iOS using the FAUST programming language. The use of musical instrument physical models in this context through the FAUST Physical Modeling Library is…
View article: THE FAUST PHYSICAL MODELING LIBRARY: A MODULAR PLAYGROUND FOR THE DIGITAL LUTHIER
THE FAUST PHYSICAL MODELING LIBRARY: A MODULAR PLAYGROUND FOR THE DIGITAL LUTHIER Open
International audience
View article: Mobile Music, Sensors, Physical Modeling, and Digital Fabrication: Articulating the Augmented Mobile Instrument
Mobile Music, Sensors, Physical Modeling, and Digital Fabrication: Articulating the Augmented Mobile Instrument Open
Two concepts are presented, extended, and unified in this paper: mobile device augmentation towards musical instruments design and the concept of hybrid instruments. The first consists of using mobile devices at the heart of novel musical …
View article: Modeling And Digitizing Reproducing Piano Rolls.
Modeling And Digitizing Reproducing Piano Rolls. Open
[TODO] Add abstract here.
View article: Passively Augmenting Mobile Devices Towards Hybrid Musical Instrument Design
Passively Augmenting Mobile Devices Towards Hybrid Musical Instrument Design Open
Mobile devices constitute a generic platform to make standalone musical instruments for live performance. However, they were not designed for such use and have multiple limitations when compared to other types of instruments. We introduce …
View article: Perceptual Spatial Audio Recording, Simulation, and Rendering: An overview of spatial-audio techniques based on psychoacoustics
Perceptual Spatial Audio Recording, Simulation, and Rendering: An overview of spatial-audio techniques based on psychoacoustics Open
Developments in immersive audio technologies have been evolving in two directions: physicallymotivated and perceptually-motivated systems. Physically motivated techniques aim to reproduce a physically accurate approximation of desired soun…
View article: New Signal Processing Libraries for Faust
New Signal Processing Libraries for Faust Open
We present a completely re-organized set of signal processing libraries for the Faust programming language. They aim at providing a clearer classification of the different Faust DSP functions, as well as better documentation. After giving …
View article: faust2api: a Comprehensive API Generator for Android and iOS
faust2api: a Comprehensive API Generator for Android and iOS Open
International audience
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: Closed Form Fractional Integration and Differentiation via Real Exponentially Spaced Pole-Zero Pairs
Closed Form Fractional Integration and Differentiation via Real Exponentially Spaced Pole-Zero Pairs Open
We derive closed-form expressions for the poles and zeros of approximate fractional integrator/differentiator filters, which correspond to spectral roll-off filters having any desired log-log slope to a controllable degree of accuracy over…
View article: Augmenting The Ipad: The Bladeaxe
Augmenting The Ipad: The Bladeaxe Open
In this paper, we present the BladeAxe: an iPad-based musical instrument leveraging the concepts of augmented mobile device and hybrid physical model controller. By being almost fully standalone, it can be used easily on stage in the frame…
View article: Mobilefaust: A Set Of Tools To Make Musical Mobile Applications With The Faust Programming Language
Mobilefaust: A Set Of Tools To Make Musical Mobile Applications With The Faust Programming Language Open
This work presents a series of tools to turn Faust code into various elements ranging from fully functional applications to multi-platform libraries for real time audio signal processing on iOS and Android. Technical details about their us…