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Estimation of diagonal Volterra Kernels of an audio System during Normal Operation with Multiple Least Mean Squares Adaptive Filters

Estimation of Diagonal Volterra Kernels of an Audio System D...

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2023 immersive and 3d audio: from architecture to automotive, i3da 2023

作者： Pinardi, daniel Farina, Angelo Binelli, Marco Toscani, Andrea University of Parma Dept. of Engineering and Architecture Parma Italy

ISBN: (纸本)9798350311044

The usage of Complete Volterra Kernels for emulating the nonlinear behavior of sound systems has been investigated for decades. due to the computational load, the real-time implementation is typically limited to second order distortion and not feasible for higher orders. This is usually unsatisfactory for audio systems in which the disturbing distortions occur mostly at orders three and five. The same authors of this work already solved the problem with the diagonal Volterra Kernels technique, which allowed to model arbitrarily high distortion orders. The estimation of the coefficients was obtained by exciting the system with an Exponential Sine Sweep signal. However, the result was often suboptimal since the signal reproduced by the sound system is usually different from a sinusoid. in this paper, a new method for estimating the diagonal Volterra Kernels coefficients is proposed, by employing any music, noise or speech signal being played by a sound system in real-time. Multiple Least Mean Square algorithms are used to estimate the coefficients up to the 5th distortion order, thus allowing to emulate the nonlinearities of a typical audio system. © 2023 iEEE.

关键词： Simulink

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Latency of spatial audio plugins: a comparative study

Latency of spatial audio plugins: a comparative study

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2023 immersive and 3d audio: from architecture to automotive, i3da 2023

作者： Tomasetti, Matteo Farina, Angelo Turchet, Luca University of Trento Dept. of Information Engineering and Computer Science Trento Italy University of Parma Dept. of Engineering and Architecture Parma Italy

ISBN: (纸本)9798350311044

The use of spatial audio plugins (SAPs) with Ambisonics processing and binaural rendering has become widespread in the last decade, thanks to their increased accessibility and usability. SAPs are particularly relevant in scenarios involving real-time music playing with headphones, such as networked music performance and individual recreational music-making using backing tracks. However, a crucial issue that has been largely overlooked thus far is the measurement of the processing latency introduced by currently available SAPs. identifying which SAPs are the fastest is essential to enable designers, musicians, and researchers to create time-sensitive applications involving 3d audio. To bridge this gap, we compared nine systems formed by different SAPs that enable 3d audio management. We measured the latency of each system throughout the third-order Ambisonics plugins pipeline: encoding, room simulation, sound scene rotation, and binaural decoding. in particular, the measurements were performed utilizing different buffer sizes. Results showed that to achieve a minimization of the latency, it is necessary to use a combination of different SAPs from different systems. Based on our measurements, we propose two spatial audio systems that mix different SAPs. Considering a sampling rate of 48 kHz, a dell Alienware x15 R2 laptop running the Windows 10 operating system, and an RME Fireface UFX sound card, the two systems achieved an overall latency of 0.33 ms and 0.94 ms respectively. © 2023 iEEE.

关键词： audio systems

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Multichannel mobile audio recordings for spatial enhancements and ambisonics rendering

Multichannel mobile audio recordings for spatial enhancement...

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2023 immersive and 3d audio: from architecture to automotive, i3da 2023

作者： Vryzas, Nikolaos Stamatiadou, Marina Eirini Vrysis, Lazaros dimoulas, Charalampos Thessaloniki Greece

ISBN: (纸本)9798350311044

Ambisonics recording allows the playback of a captured 3d audio scene. in many cases, higher-order ambisonics or a set of first-order ambisonics arrays may be used for better results. Virtual ambisonics synthesis and reproduction allows the design and rendering of an audio scene by providing the sound source signals and positions. in this paper, an extended array is proposed, comprising a first-order ambisonics soundfield array, and an arbitrary non-calibrated spatial smartphone-microphone array. The main objective is to investigate whether this extended setup can enhance the spatial resolution of the first-order soundfield array without dramatically increasing the system complexity. The smartphone array provides additional information concerning the relative direction of arrival of different sources, through the calculation of a vector containing the time difference of arrival for all available microphones. A T-SNE visualization is used to show the separability of these vectors that expresses the system's spatial and temporal resolution. Resolution proves to be higher than that of a first-order soundfield array compared to an experiment conducted in previous studies. This supports the idea that the proposed extended array can enhance the resolution of Ambisonic Energy-Based Localization methods. © 2023 iEEE.

关键词： Smartphones

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Ambisonic room impulse responses extrapolation guided by single microphone measurements

Ambisonic room impulse responses extrapolation guided by sin...

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2023 immersive and 3d audio: from architecture to automotive, i3da 2023

作者： Fan, Yake Zhang, Wen Northwestern Polytechnical University Center of Intelligent Acoustics and Immersive Communications School of Marine Science and Technology Xi'an China

ISBN: (纸本)9798350311044

Sound fields and room impulse responses represented using higher-order-Ambisonics (HOA) is an efficient way to generate six-degree-freedom (6doF) binaural rendering. However, measuring the room impulse responses of the entire space is impractical in reality. While many methods have been proposed for Ambisonic room impulses response (ARiR) interpolation and extrapolation, in this work, we propose a robust ARiR extrapolation method by combing the ARiR, which is measured at a fixed point inside the room, with the monaural RiR measured at the extrapolation point. The ARiR is decomposed into a direct part, distinct early reflections, and the residual reverberation. For the direct and early reflection parts, extrapolation is performed by estimating the source positions based on a parametric analysis of the measured ARiR and monaural RiR. The extrapolation of the residual reverberation is achieved by manipulating the monaural RiR, where the weights are derived from ARiR measurements. Finally, objective and subjective evaluations are conducted to evaluate the accuracy and robustness of the proposed method. The results show that the proposed method approximates the true ARiR in terms of objective indicators and subjective perception. © 2023 iEEE.

关键词： Reverberation

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Treble Auralizer: a real time Web audio Engine enabling 3doF auralization of simulated room acoustics designs

Treble Auralizer: a real time Web Audio Engine enabling 3DoF...

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2023 immersive and 3d audio: from architecture to automotive, i3da 2023

作者： Milo, Alessia Einarsson, Jóhannes F. Einarsson, Úlfur Pind, Finnur Treble Technologies Reykjavík Iceland

ISBN: (纸本)9798350311044

We present with this paper an original system designed to experience spatial impulse responses generated by our acoustic simulation framework directly on the web. The user can set the simulation parameters (source-receiver positions, materials, simulation settings) and visualize the simulation results in the web application. Once the simulation data is obtained, the user can experience in 3doF the dynamic binaural rendering of the Second Order Ambisonics Room impulse Responses (SOA-RiRs) for each source-receiver pair, individually or with multiple sources at once. The original anechoic tracks from the database provided are convolved in real time with the SOA-RiRs and the source levels can be adjusted to create accurate soundscapes representing the acoustic design scenarios. The user can switch seamlessly between receiver positions and compare simulation results from different geometries or material configurations. in this paper we describe the system details and its technical limitations. Finally, we discuss its application for the acoustic engineering field, where perceptually comparing results from different room acoustic solutions can support the analysis of numerical or graphical reports, and thus shorten the time needed to find optimal design solutions. © 2023 iEEE.

关键词： audio acoustics

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iSO X3d 4.0 audio Graph for web3d applications. Latest trends in declarative 3d sound for the web

ISO X3D 4.0 Audio Graph for web3D applications. Latest trend...

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2023 immersive and 3d audio: from architecture to automotive, i3da 2023

作者： Papadaki, Maria Brutzman, don Lakka, Eftychia Puk, Richard daskalakis, Georgios Malamos, Athanasios G. Hellenic Mediterranean University Dept of Electrical and Computer Engineering Heraklion Greece MontereyCA United States University of South Wales Faculty of Computing Engineering and Science United Kingdom Intelligraphics Inc.

ISBN: (纸本)9798350311044

Our work, as 3d audio Working Group of Web3d Consortium, aims to integrate acoustic properties associated with geometric shapes together with 3d spatial sound and insert this new technology into the X3d v4.0 iSO standard. in this paper we present X3d 4.0 audio Graph APi as it is embedded with all the latest improvements and examples. Moreover, we introduce novel ideas and use cases on how X3d v4.0 may improve immersion experience in Metaverse games, theatre or music performances and concerts. in this paper we introduce new audio components of the X3d standard and we present a case study of a platform that enhances users' experience in scenarios of live online performances, mainly theater or music concerts, by enriching the realism of the streamed audio through auralization and virtual specialization. Our strong point is that we manage to include all the necessary information inside the scene nodes and combine three technologies that serve different purposes to work harmonically together, allowing multiple people to stream and enjoy the performance as they would in a real theater. We achieve this goal by joining state of the art technologies that involves web3d, teleconferencing and sound. Thus we may encourage community to create new real time applications like virtual theatre or tele-orchestras. © 2023 iEEE.

关键词： iSO Standards

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AdM-OSC: an industry initiative for communicating object-based audio data

ADM-OSC: an industry initiative for communicating object-bas...

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2023 immersive and 3d audio: from architecture to automotive, i3da 2023

作者： Zbyszyński, Michael déjardin, Hervé Marston, david Le Nost, Guillaume Creative Software L-Acoustics London United Kingdom Radio France Audio Innovation Department Paris France Research & Development Bbc London United Kingdom

ISBN: (纸本)9798350311044

Spatial and immersive audio has become increasingly mainstream, presented in concert halls and more recently (e.g. Apple: June 2021) through music streaming services. There is a diverse ecosystem of hardware and software controllers and renderers in both live and studio settings that would benefit from a standardized communication protocol. Since 2021 a growing group of industry stakeholders has been working to develop AdM-OSC to fill this need. AdM-OSC proposes a standard for transmitting position data for object-based audio by implementing a namespace in parallel with the audio definition Model (AdM), a metadata standard developed in the broadcast industry. Open Sound Control (OSC) is a well-established data transport protocol developed for flexible and accurate communication of real-time performance data. By leveraging these open standards, we have created a lightweight specification that can be easily implemented in audio software, plugins, game engines, consoles, and *** paper will discuss the design principals of AdM-OSC, developed to meet the needs of specific stakeholders and use cases. The core address space for position data is described, including a solution for representing both physics-based and cinematic distance. Proposed extensions to the next version of the specification will add comprehensive support for additional broadcast use cases, including different types of audio content (e.g., different languages or assistive descriptions), user interactivity, and cues for reducing channel count. We conclude with an overview of future AdM-OSC development, including next steps in bringing together ideas and discussion from multiple industry partners. © 2023 iEEE.

关键词： Metadata

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Effects of the Types of Headphones and Sound Sources on Spatial audio Quality

Effects of the Types of Headphones and Sound Sources on Spat...

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2023 immersive and 3d audio: from architecture to automotive, i3da 2023

作者： Soeta, Yoshiharu Nishiura, Takanobu Biomedical Research Institute Osaka Japan Ritsumeikan University Graduate School of Information Science and Engineering Shiga Japan

ISBN: (纸本)9798350311044

Acoustic characteristics of sound fields reproduced by headphones are a major concern to evaluate spatial audio quality. Several specifications exist for acoustic attributes, including frequency response, impedance, and sensitivity. While prior research has illuminated these acoustic features, it falls short in evaluating the spatial audio quality produced by headphones. Such studies don't sufficiently detail the impact of headphones and sound sources. in this study, we carried out psychological evaluations and acoustical measurements of sound fields reproduced by headphones to identify the acoustic elements that account for the spatial audio quality rendered by the headphones. Three types of sound excerpts were played with seven types of headphones, and the psychological evaluations were carried out by 30 participants. Envelopment and apparent source width were evaluated as psychological evaluations. from the binaural impulse response, we determined the center time (Ts), the maximum value (iACC) of the interaural cross-correlation function (iACF), and the iACC width (WiACC). We derived the iACF and auto-correlation function (ACF) parameters from the recorded sound sources. The traits of both the headphones and the sound source influenced the psychological assessments. The variation in spatial audio quality across headphones and sound sources can be attributed to the peak value of the initial maximum amplitude of the ACF, Ts, and WiACC © 2023 iEEE.

关键词： Acoustic fields

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Effects of Modified Late Reverberation on audio-Visual Plausibility and Externalization in AR

Effects of Modified Late Reverberation on Audio-Visual Plaus...

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2023 immersive and 3d audio: from architecture to automotive, i3da 2023

作者： Schneiderwind, Christian Richter, Maike Merten, Nils Neidhardt, Annika Technische Universität Ilmenau Electronic Media Technology Group Ilmenau Germany Brandeburg Labs GmbH Ilmenau Germany Technische Universität Ilmenau Institute of Media Technology Ilmenau Germany

ISBN: (纸本)9798350311044

Binaural synthesis systems can create virtual sound sources that are indistinguishable from reality. in Augmented Reality (AR) applications, virtual sound sources need to blend in with the real environment to create plausible illusions. However, in some scenarios, it may be desirable to enhance the natural acoustic properties of the virtual content to improve speech intelligibility, alleviate listener fatigue, or achieve a specific artistic effect. Previous research has shown that deviating from the original room acoustics can degrade the quality of the auditory illusion, often referred to as the room divergence effect. This study investigates whether it is possible to modify the auditory aesthetics of a room environment without compromising the plausibility of a sound event in AR. To accomplish this, the length of the reverberation tails of measured binaural room impulse responses are modified after the mixing time to change reverberance.A listening test was conducted to evaluate the externalization and audio-visual plausibility of an exemplary AR scene for different degrees of reverberation modification. The results indicate that externalization is unaffected even with extreme modifications (such as a stretch ratio of 1.8). However, audio-visual plausibility is only maintained for moderate modifications (such as stretch ratios of 0.8 and 1.2). © 2023 iEEE.

关键词： Reverberation

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immersive Venice - A Thousand Echoes

Immersive Venice - A Thousand Echoes

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2023 immersive and 3d audio: from architecture to automotive, i3da 2023

作者： Vismara, Giulia Van Tonder, Cobi McArthur, Angela Royal Academy and Conservatory Anvers MaxLAb Research Group Belgium University of Bologna Dept of Architecture Italy University College London Dept. of Anthropology London United Kingdom

ISBN: (纸本)9798350311044

The soundscapes of Venice are as fascinating as its architectural wonders, rich history, impressive art and vibrant contemporary life. The timeless essence of the city, carved in marble over the millennia, appears firm and fluid, echoing the ebb of the tides. Venice is a city engaged in an incessant dialogue with its past, bridging the gap between the ephemeral and the lasting. Following the technique of auralization, we embark on a journey to explore the echoes of Venice, capturing its acoustic footprints and the existing and imaginary immersive sound. We venture into the quiet nights of the city, recording impulse responses from unusual viewpoints capturing different moments in time and space. Our collection includes field recordings that include the rhythmic cadence of thousands of steps, the daily buzz of voices on the streets, and the gentle caress of water against boats, docks, and seabeds, all contributing to the unique acoustics of the city. Through our artistic practice, we challenge the notion of objectivity in scientific research. We intersect our subjective sound practices with a scientific approach using technological means that respond to a specific space definition. Living a notion of space as physical and sensory and a notion of time as layered and non-linear, we agree on all these elements to present an exploration enriched by the auditory landscape of Venice. This material that reveals the deep connection between this extraordinary city's sound and essence will nourish three compositions and an acoustic mapping. This article presents meta-perspectives that consider paradigms of objectivity/ subjectivity and the importance of recognizing multiple perspectives when working with acoustic and sonic footprints of places. © 2023 iEEE.

关键词： art auralisation composition immersive listening sonic-mapmaking sound space

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