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Arbitrary-Order IIR Antiderivative Antialiasing 任意阶IIR不定积分抗混叠
2021 24th International Conference on Digital Audio Effects (DAFx) Pub Date : 2021-09-08 DOI: 10.23919/DAFx51585.2021.9768266
Pier Paolo La Pastina, Stefano D'Angelo, L. Gabrielli
{"title":"Arbitrary-Order IIR Antiderivative Antialiasing","authors":"Pier Paolo La Pastina, Stefano D'Angelo, L. Gabrielli","doi":"10.23919/DAFx51585.2021.9768266","DOIUrl":"https://doi.org/10.23919/DAFx51585.2021.9768266","url":null,"abstract":"Nonlinear digital circuits and waveshaping are active areas of study, specifically for what concerns numerical and aliasing issues. In the past, an effective method was proposed to discretize nonlinear static functions with reduced aliasing based on the antiderivative of the nonlinear function. Such a method is based on the continuous-time convolution with an FIR antialiasing filter kernel, such as a rectangular kernel. These kernels, however, are far from optimal for the reduction of aliasing. In this paper we introduce the use of arbitrary IIR rational transfer functions that allow a closer approximation of the ideal antialiasing filter, required in the fictitious continuous-time domain before sampling the nonlinear function output. These allow a higher degree of aliasing reduction and can be flexibly adjusted to balance performance and computational cost.","PeriodicalId":221170,"journal":{"name":"2021 24th International Conference on Digital Audio Effects (DAFx)","volume":"566 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116244502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Spherical Decomposition of Arbitrary Scattering Geometries for Virtual Acoustic Environments 虚拟声环境中任意散射几何的球面分解
2021 24th International Conference on Digital Audio Effects (DAFx) Pub Date : 2021-09-08 DOI: 10.23919/DAFx51585.2021.9768234
Raimundo Gonzalez, A. Politis, T. Lokki
{"title":"Spherical Decomposition of Arbitrary Scattering Geometries for Virtual Acoustic Environments","authors":"Raimundo Gonzalez, A. Politis, T. Lokki","doi":"10.23919/DAFx51585.2021.9768234","DOIUrl":"https://doi.org/10.23919/DAFx51585.2021.9768234","url":null,"abstract":"A method is proposed to encode the acoustic scattering of objects for virtual acoustic applications through a multiple-input and multiple-output framework. The scattering is encoded as a matrix in the spherical harmonic domain, and can be re-used and manipulated (rotated, scaled and translated) to synthesize various sound scenes. The proposed method is applied and validated using Boundary Element Method simulations which shows accurate results between references and synthesis. The method is compatible with existing frameworks such as Ambisonics and image source methods.","PeriodicalId":221170,"journal":{"name":"2021 24th International Conference on Digital Audio Effects (DAFx)","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115960195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Alloy Sounds: Non-Repeating Sound Textures with Probabilistic Cellular Automata 合金声音:不重复的声音纹理与概率元胞自动机
2021 24th International Conference on Digital Audio Effects (DAFx) Pub Date : 2021-09-08 DOI: 10.23919/DAFx51585.2021.9768249
T. Tavares, Thales Roel P. Pessanha, Gustavo Nishihara, Guilherme Z. L. Avila
{"title":"Alloy Sounds: Non-Repeating Sound Textures with Probabilistic Cellular Automata","authors":"T. Tavares, Thales Roel P. Pessanha, Gustavo Nishihara, Guilherme Z. L. Avila","doi":"10.23919/DAFx51585.2021.9768249","DOIUrl":"https://doi.org/10.23919/DAFx51585.2021.9768249","url":null,"abstract":"Contemporary musicians commonly face the challenge of finding new, characteristic sounds that can make their compositions more distinct. They often resort to computers and algorithms, which can significantly aid in creative processes by generating unexpected material in controlled probabilistic processes. In particular, algorithms that present emergent behaviors, like genetic algorithms and cellular automata, have fostered a broad diversity of musical explorations. This article proposes an original technique for the computer-assisted creation and manipulation of sound textures. The technique uses Probabilistic Cellular Automata, which are yet seldom explored in the music domain, to blend two audio tracks into a third, different one. The proposed blending process works by dividing the source tracks into frequency bands and then associating each of the automaton's cell to a frequency band. Only one source, chosen by the cell's state, is active within each band. The resulting track has a non-repeating textural pattern that follows the changes in the Cellular Automata. This blending process allows the musician to choose the original material and the blend granularity, significantly changing the resulting blends. We demonstrate how to use the proposed blending process in sound design and its application in experimental and popular music.","PeriodicalId":221170,"journal":{"name":"2021 24th International Conference on Digital Audio Effects (DAFx)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130040537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Non-Iterative Schemes for the Simulation of Nonlinear Audio Circuits 非线性音频电路仿真的非迭代算法
2021 24th International Conference on Digital Audio Effects (DAFx) Pub Date : 2021-09-08 DOI: 10.23919/DAFx51585.2021.9768254
M. Ducceschi, S. Bilbao, Craig J. Webb
{"title":"Non-Iterative Schemes for the Simulation of Nonlinear Audio Circuits","authors":"M. Ducceschi, S. Bilbao, Craig J. Webb","doi":"10.23919/DAFx51585.2021.9768254","DOIUrl":"https://doi.org/10.23919/DAFx51585.2021.9768254","url":null,"abstract":"In this work, a number of numerical schemes are presented in the context of virtual-analog simulation. The schemes are linearly-implicit in character, and hence directly solvable without iterative methods. Schemes of increasing order of accuracy are constructed, and convergence and stability conditions are proven formally. The schemes are able to handle stiff problems very efficiently, because of their fast update, and can be run at higher sample rates to reduce aliasing. The cases of the diode clipper and ring modulator are investigated in detail, including several numerical examples.","PeriodicalId":221170,"journal":{"name":"2021 24th International Conference on Digital Audio Effects (DAFx)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130182710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Interacting with Digital Audio Effects Through a Haptic Knob with Programmable Resistance 通过可编程电阻的触觉旋钮与数字音频效果进行交互
2021 24th International Conference on Digital Audio Effects (DAFx) Pub Date : 2021-09-08 DOI: 10.23919/DAFx51585.2021.9768295
Y. D. Pra, F. Fontana, S. Papetti
{"title":"Interacting with Digital Audio Effects Through a Haptic Knob with Programmable Resistance","authors":"Y. D. Pra, F. Fontana, S. Papetti","doi":"10.23919/DAFx51585.2021.9768295","DOIUrl":"https://doi.org/10.23919/DAFx51585.2021.9768295","url":null,"abstract":"Live music performances and music production often involve the manipulation of several parameters during sound generation, processing, and mixing. In hardware layouts, those parameters are usually controlled using knobs, sliders and buttons. When these layouts are virtualized, the use of physical (e.g. MIDI) controllers can make interaction easier and reduce the cognitive load associated to sound manipulation. The addition of haptic feedback can further improve such interaction by facilitating the detection of the nature (continuous / discrete) and value of a parameter. To this end, we have realized an endless-knob controller prototype with programmable resistance to rotation, able to render various haptic effects. Ten subjects assessed the effectiveness of the provided haptic feedback in a target-matching task where either visual-only or visual-haptic feedback was provided; the experiment reported significantly lower errors in presence of haptic feedback. Finally, the knob was configured as a multi-parametric controller for a real-time audio effect software written in Python, simulating the voltage-controlled filter aboard the EMS VCS3. The integration of the sound algorithm and the haptic knob is discussed, together with various haptic feedback effects in response to control actions.","PeriodicalId":221170,"journal":{"name":"2021 24th International Conference on Digital Audio Effects (DAFx)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131142964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Amp-Space: A Large-Scale Dataset for Fine-Grained Timbre Transformation 放大器空间:用于细粒度音色变换的大规模数据集
2021 24th International Conference on Digital Audio Effects (DAFx) Pub Date : 2021-09-08 DOI: 10.23919/DAFx51585.2021.9768241
Jason Naradowsky
{"title":"Amp-Space: A Large-Scale Dataset for Fine-Grained Timbre Transformation","authors":"Jason Naradowsky","doi":"10.23919/DAFx51585.2021.9768241","DOIUrl":"https://doi.org/10.23919/DAFx51585.2021.9768241","url":null,"abstract":"We release Amp-Space, a large-scale dataset of paired audio samples: a source audio signal, and an output signal, the result of a timbre transformation. The types of transformations we study are from blackbox musical tools (amplifiers, stompboxes, studio effects) traditionally used to shape the sound of guitar, bass, or synthesizer sounds. For each sample of transformed audio, the set of parameters used to create it are given. Samples are from both real and simulated devices, the latter allowing for orders of magnitude greater data than found in comparable datasets. We demonstrate potential use cases of this data by (a) pre-training a conditional WaveNet model on synthetic data and show that it reduces the number of samples necessary to digitally reproduce a real musical device, and (b) training a variational autoencoder to shape a continuous space of timbre transformations for creating new sounds through interpolation.","PeriodicalId":221170,"journal":{"name":"2021 24th International Conference on Digital Audio Effects (DAFx)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125080964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Exposure Bias and State Matching in Recurrent Neural Network Virtual Analog Models 递归神经网络虚拟模拟模型的暴露偏差与状态匹配
2021 24th International Conference on Digital Audio Effects (DAFx) Pub Date : 2021-09-08 DOI: 10.23919/DAFx51585.2021.9768259
Aleksi Peussa, Eero-Pekka Damskägg, Thomas W. Sherson, S. Mimilakis, Lauri Juvela, Athanasios Gotsopoulos, V. Välimäki
{"title":"Exposure Bias and State Matching in Recurrent Neural Network Virtual Analog Models","authors":"Aleksi Peussa, Eero-Pekka Damskägg, Thomas W. Sherson, S. Mimilakis, Lauri Juvela, Athanasios Gotsopoulos, V. Välimäki","doi":"10.23919/DAFx51585.2021.9768259","DOIUrl":"https://doi.org/10.23919/DAFx51585.2021.9768259","url":null,"abstract":"Virtual analog (VA) modeling using neural networks (NNs) has great potential for rapidly producing high-fidelity models. Recurrent neural networks (RNNs) are especially appealing for VA due to their connection with discrete nodal analysis. Furthermore, VA models based on NNs can be trained efficiently by directly exposing them to the circuit states in a gray-box fashion. However, exposure to ground truth information during training can leave the models susceptible to error accumulation in a free-running mode, also known as “exposure bias” in machine learning literature. This paper presents a unified framework for treating the previously proposed state trajectory network (STN) and gated recurrent unit (GRU) networks as special cases of discrete nodal analysis. We propose a novel circuit state-matching mechanism for the GRU and experimentally compare the previously mentioned networks for their performance in state matching, during training, and in ex-posure bias, during inference. Experimental results from modeling a diode clipper show that all the tested models exhibit some exposure bias, which can be mitigated by truncated backpropagation through time. Furthermore, the proposed state matching mechanism improves the GRU modeling performance of an overdrive pedal and a phaser pedal, especially in the presence of external modulation, apparent in a phaser circuit.","PeriodicalId":221170,"journal":{"name":"2021 24th International Conference on Digital Audio Effects (DAFx)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132185436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
On the Equivalence of Integrator- and Differentiator-Based Continuous- and Discrete-Time Systems 基于积分器和微分器的连续和离散系统的等价性
2021 24th International Conference on Digital Audio Effects (DAFx) Pub Date : 2021-09-08 DOI: 10.23919/DAFx51585.2021.9768248
V. Zavalishin, Julian Parker
{"title":"On the Equivalence of Integrator- and Differentiator-Based Continuous- and Discrete-Time Systems","authors":"V. Zavalishin, Julian Parker","doi":"10.23919/DAFx51585.2021.9768248","DOIUrl":"https://doi.org/10.23919/DAFx51585.2021.9768248","url":null,"abstract":"The article performs a generic comparison of integrator- and differentiator based continuous-time systems as well as their discrete-time models, aiming to answer the reoccurring question in the music DSP community of whether there are any benefits in using differentiators instead of conventionally employed integrators. It is found that both kinds of models are practically equivalent, but there are certain reservations about differentiator based models.","PeriodicalId":221170,"journal":{"name":"2021 24th International Conference on Digital Audio Effects (DAFx)","volume":"182 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122592266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Combining Zeroth and First-Order Analysis with Lagrange Polynomials to Reduce Artefacts in Live Concatenative Granulation 结合零阶和一阶分析与拉格朗日多项式减少实时串联造粒中的伪影
2021 24th International Conference on Digital Audio Effects (DAFx) Pub Date : 2021-09-08 DOI: 10.23919/DAFx51585.2021.9768227
Dario Sanfilippo, Julian Parker
{"title":"Combining Zeroth and First-Order Analysis with Lagrange Polynomials to Reduce Artefacts in Live Concatenative Granulation","authors":"Dario Sanfilippo, Julian Parker","doi":"10.23919/DAFx51585.2021.9768227","DOIUrl":"https://doi.org/10.23919/DAFx51585.2021.9768227","url":null,"abstract":"This paper presents a technique addressing signal discontinuity and concatenation artefacts in real-time granular processing with rectangular windowing. By combining zero-crossing synchronicity, first-order derivative analysis, and Lagrange polynomials, we can generate streams of uncorrelated and non-overlapping sonic fragments with minimal low-order derivatives discontinuities. The resulting open-source algorithm, implemented in the Faust language, provides a versatile real-time software for dynamical looping, wavetable oscillation, and granulation with reduced artefacts due to rectangular windowing and no artefacts from overlap-add-to-one techniques commonly deployed in granular processing.","PeriodicalId":221170,"journal":{"name":"2021 24th International Conference on Digital Audio Effects (DAFx)","volume":"407 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122798364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Higher-Order Anti-Derivatives of Band Limited Step Functions for the Design of Radial Filters in Spherical Harmonics Expansions 带限阶跃函数的高阶不定导数用于球面谐波展开中径向滤波器的设计
2021 24th International Conference on Digital Audio Effects (DAFx) Pub Date : 2021-09-08 DOI: 10.23919/DAFx51585.2021.9768233
Nara Hahn, Frank Schultz, S. Spors
{"title":"Higher-Order Anti-Derivatives of Band Limited Step Functions for the Design of Radial Filters in Spherical Harmonics Expansions","authors":"Nara Hahn, Frank Schultz, S. Spors","doi":"10.23919/DAFx51585.2021.9768233","DOIUrl":"https://doi.org/10.23919/DAFx51585.2021.9768233","url":null,"abstract":"This paper presents a discrete-time model of the spherical harmonics expansion describing a sound field. The so-called radial functions are realized as digital filters, which characterize the spatial impulse responses of the individual harmonic orders. The filter coefficients are derived from the analytical expressions of the time-domain radial functions, which have a finite extent in time. Due to the varying degrees of discontinuities occurring at their edges, a time-domain sampling of the radial functions gives rise to aliasing. In order to reduce the aliasing distortion, the discontinuities are replaced with the higher-order anti-derivatives of a band-limited step function. The improved spectral accuracy is demonstrated by numerical evaluation. The proposed discrete-time sound field model is applicable in broadband applications such as spatial sound reproduction and active noise control.","PeriodicalId":221170,"journal":{"name":"2021 24th International Conference on Digital Audio Effects (DAFx)","volume":"291 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122086743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
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