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检索条件"主题词=Spatial audio coding"

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spatial audio coding WITHOUT RECOURSE TO BACKGROUND SIGNAL COMPRESSION 44

SPATIAL AUDIO CODING WITHOUT RECOURSE TO BACKGROUND SIGNAL C...

引用

44th IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

作者： Zamani, Sina Rose, Kenneth Univ Calif Santa Barbara Dept Elect & Comp Engn Santa Barbara CA 93106 USA

ISBN: (纸本)9781479981311

The MPEG-H 3D audio standard applies singular value decomposition (SVD) to the input higher order ambisonics data, then encodes each predominant (foreground) sound component independently using a standard core audio codec. The residual (background) signal is encoded in the ambisonic domain. This paper is motivated by the observations: i) separate coding of SVD components ignores spatial inter channel masking effects;ii) compression in both SVD and ambisonic domains is difficult to perceptually optimize;iii) Only few predominant components are encoded due to the prohibitive side information cost of specifying SVD basis vectors. The proposed coding architecture overcomes the first two concerns by performing all compression in the SVD domain with a masking threshold that is calculated jointly for all encoded components, thereby accounting for cross-component masking. The third shortcoming is circumvented by a novel method for extending a given set of SVD basis vectors at no side information cost, by computing (at both encoder and decoder) basis vectors to span the null space of the transmitted basis vectors. Experimental results provide evidence for substantial objective and subjective gains.

关键词： Higher order ambisonics spatial audio coding audio compression 3D audio

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Construction of Ambience Bases from Weighing Matrices with Application in spatial audio coding

Construction of Ambience Bases from Weighing Matrices with A...

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IEEE International Workshop on Signal Processing Systems (IEEE SiPS)

作者： Gorlow, Stanislaw Dolby Sweden Stockholm Sweden

ISBN: (纸本)9781538663189

Parametric spatial audio coding schemes, such as advanced joint channel coding in Dolby's next-generation audio coding system AC-4, achieve a higher data compression ratio as a result of a lower-dimensional intermediate signal representation, known as the downmix. During the inverse process, the upmix, which is guided by side information, the covariance between the source signals is reconstructed to preserve perceptually important cues such as ambience or source width. In this manuscript, a systematic approach for the construction of ambience bases from weighing matrices is presented. Furthermore, the basis vectors are generalized to accommodate for nonunitary mixing weights, and a new basis is derived. Round figures from internal listening tests are shared to underpin the utility of the approach.

关键词： variance-covariance reconstruction Gaussian single-channel mixture decorrelation parametric audio coding spatial audio coding

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FREQUENCY DOMAIN SINGULAR VALUE DECOMPOSITION FOR EFFICIENT spatial audio coding

FREQUENCY DOMAIN SINGULAR VALUE DECOMPOSITION FOR EFFICIENT ...

引用

IEEE Workshop on Applications of Signal Processing to audio and Acoustics (WASPAA)

作者： Zamani, Sina Nanjundaswamy, Tejaswi Rose, Kenneth Univ Calif Santa Barbara Dept Elect & Comp Engn Santa Barbara CA 93106 USA

ISBN: (纸本)9781538616321

Advances in virtual reality have generated substantial interest in accurately reproducing and storing spatial audio in the higher order ambisonics (HOA) representation, given its rendering flexibility. Recent standardization for HOA compression adopted a framework wherein HOA data are decomposed into principal components that are then encoded by standard audio coding, i.e., frequency domain quantization and entropy coding to exploit psychoacoustic redundancy. A noted shortcoming of this approach is the occasional mismatch in principal components across blocks, and the resulting suboptimal transitions in the data fed to the audio coder. Instead, we propose a framework where singular value decomposition (SVD) is performed after transformation to the frequency domain via the modified discrete cosine transform (MDCT). This framework not only ensures smooth transition across blocks, but also enables frequency dependent SVD for better energy compaction. Moreover, we introduce a novel noise substitution technique to compensate for suppressed ambient energy in discarded higher order ambisonics channels, which significantly enhances the perceptual quality of the reconstructed HOA signal. Objective and subjective evaluation results provide evidence for the effectiveness of the proposed framework in terms of both higher compression gains and better perceptual quality, compared to existing methods.

关键词： Higher Order Ambisonics spatial audio coding audio compression 3D audio

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Balanced-Delay Filterbank for Closed-Loop spatial audio coding 16

Balanced-Delay Filterbank for Closed-Loop Spatial Audio Codi...

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International Seminar on Intelligent Technology and Its Applications (ISITIA)

作者： Elfitri, Ikhwana Laksono, Heru Dibyo Permana, Al Kautsar Andalas Univ Fac Engn Dept Elect Engn Kampus UNAND Limau Manih Padang 25163 Sumatera Barat Indonesia

ISBN: (纸本)9781479977116

Closed-loop configuration has been introduced to spatial audio coding (SAC) which make it possible to minimise distortion introduced during the quantisation and encoding processes. Significant performance improvement has been shown and reported in some papers. However, implementation of closed-loop system directly to MPEG Surround (MPS) is still problematic due to the unbalanced-delay filterbank that is used in the MPEG standard which is not appropriate for a closed-loop system that needs synchronisation between the original audio signals with the target audio signals. In this paper, we investigate the delay characteristic of the Quadrature Mirror Filterbank (QMF) which is used in several MPEG standards. Based on this study, a balanced-delay QMF is proposed and tested in a closed-loop MPS system. The results of the experiments show that approximately 8 dB of SNR improvement is achieved when applying balanced-delay filterbank compared to the unbalanced-delay filterbank as specified in MPS.

关键词： Filterbank spatial audio coding Multichannel audio Signals Closed-Loop System

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Investigation on Objective Performance of Closed-loop spatial audio coding 6

Investigation on Objective Performance of Closed-loop Spatia...

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6th International Conference on Information Technology and Electrical Engineering (ICITEE)

作者： Elfitri, Ikhwana Kurnia, Rahmadi Fitrilina Andalas Univ Dept Elect Engn Padang 25163 Indonesia

ISBN: (纸本)9781479953035

Closed-loop spatial audio coding is a compression technique, developed based on MPEG Surround (MPS) standard, having an advantage of minimising distortion due to quantisation process of spatial parameters. Despite the MPS is developed based on filterbank, however, this closed-loop system performs better on Modified Discrete Cosine Transform (MDCT). Considering its high performance over the open-loop system, this paper presents further investigation on objective performance of closed-loop spatial audio coding against various quantisers of spatial parameters. Experiments have been conducted to measure signal to noise ratio (SNR) across different types of uniform spatial quantisers at various operating bitrates. The results show that the SNR achieved by the open-loop approach is strongly affected by the type of the quantiser while, in contrast, the SNR achieved by the closed-loop approach is relatively constant regardless the number of bits used in the quantisers. Moreover, the results also show that the closed-loop configuration can consistently improve SNR in any quantisation scheme.

关键词： spatial audio coding MPEG Surround Closed-loop system

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PERCEPTUALLY-MOTIVATED spatial audio CODEC FOR HIGHER-ORDER AMBISONICS COMPRESSION 49

PERCEPTUALLY-MOTIVATED SPATIAL AUDIO CODEC FOR HIGHER-ORDER ...

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49th IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Hold, Christoph McCormack, Leo Politis, Archontis Pulkki, Ville Aalto Univ Dept Informat & Communicat Eng Acoust Lab Espoo Finland Tampere Univ Fac Informat Technol & Commun Sci Tampere Finland

ISBN: (纸本)9798350344868;9798350344851

Scene-based spatial audio formats, such as Ambisonics, are playback system agnostic and may therefore be favoured for delivering immersive audio experiences to a wide range of (potentially unknown) devices. The number of channels required to deliver high spatial resolution Ambisonic audio, however, can be prohibitive for low-bandwidth applications. Therefore, this paper proposes a compression codec, which is based upon the parametric higher-order Directional audio coding (HO-DirAC) model. The encoder downmixes the higher-order Ambisonic (HOA) input audio into a reduced number of signals, which are accompanied by perceptually-motivated scene parameters. The downmixed audio is coded using a perceptual audio coder, whereas the parameters are grouped into perceptual bands, quantized, and downsampled. On the decoder side, low Ambisonic orders are fully recovered. Not fully recoverable HOA components are synthesized according to the parameters. The results of a listening test indicate that the proposed parametric spatial audio codec can improve the adopted perceptual audio coder, especially at low to medium-high bitrates, when applied to fifth-order HOA signals.

关键词： spatial audio coding Ambisonics Parametric spatial audio audio compression

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OPTIMIZING HIGHER-ORDER DIRECTIONAL audio coding WITH ADAPTIVE MIXING AND ENERGY MATCHING FOR AMBISONIC COMPRESSION AND UPMIXING

OPTIMIZING HIGHER-ORDER DIRECTIONAL AUDIO CODING WITH ADAPTI...

引用

IEEE Workshop on Applications of Signal Processing to audio and Acoustics (WASPAA)

作者： Hold, Christoph McCormack, Leo Politis, Archontis Pulkki, Ville Aalto Univ Dept Signal Proc & Acoust Espoo Finland Tampere Univ Fac Informat Technol & Commun Sci Tampere Finland

ISBN: (纸本)9798350323726

In order to transmit sound-scenes encoded into the higher-order Ambisonics (HOA) format to low-bandwidth devices, transmission codecs are needed to reduce data requirements. Recently, the model-based higher-order directional audio coding (HO-DirAC) method was formulated for HOA input to HOA output. Compression is achieved by reducing the number of audio transport channels through spatial discretization. These transport channels are then used to reconstruct the scene on the receiving end based on accompanying spatial metadata. This reconstructed scene may also be optionally upmixed to a higher-order;leading to an enhancement in spatial-resolution. In this paper, the authors analyze certain sound-scenes that were especially challenging for the previously proposed HO-DirAC framework, which the authors postulate could be attributed to the lower-order reconstruction of diffuse sound-field components. Three optimizations for HO-DirAC are proposed, which all employ optimal adaptive mixing and/or energy matching of Ambisonic components based on spatial covariance matrices. The methods are formulated such that they are applied directly in the reconstruction of HOA from the spatially discrete transport audio signals. Notably, a dedicated low-complexity solution without additional side-information is derived. Instrumental evaluations confirm a reduced reconstruction error when using either of the proposed optimizations. These improvements were also demonstrated via a perceptual evaluation, whereby four, six, and twelve transport channels were used to reconstruct (and upmix to) fifth-order reference sound-scenes. The evaluation highlighted the high perceptual performance of the proposed optimizations, including the low-complexity version, thereby improving parametric spatial audio coding and reproduction.

关键词： spatial audio coding higher order ambisonics spherical harmonic domain

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Ambisonics coding in IVAS: A Hybrid SPAR and DirAC System

Ambisonics Coding in IVAS: A Hybrid SPAR and DirAC System

引用

2025 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2025

作者： Weckbecker, Dominik Brown, Stefanie Torres, Juan Multrus, Markus Tamarapu, Archit Fuchs, Guillaume Fraunhofer IIS Erlangen Germany Dolby Laboratories Sydney Australia

ISBN: (纸本)9798350368741

The Ambisonics audio format represents a 3D sound field as a fixed set of audio channels, with a tradeoff between spatial detail and the required number of audio channels. Because the number of audio channels that must be coded increases quadratically with respect to Ambisonics order, high-quality coding of Ambisonics signals under practical bitrate and complexity constraints becomes a major challenge. To overcome this, the 3GPP IVAS codec employs a new hybrid parametric and residual coding scheme combining complementary spatial Reconstruction (SPAR) and Directional audio coding (DirAC) techniques. In this paper, we describe the implementation of this hybrid coding system and demonstrate its advantages to discrete channel-coding approaches in terms of computational complexity and audio quality. © 2025 IEEE.

关键词： Ambisonics mobile communications spatial audio coding

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A first-order DirAC-based parametric Ambisonic coder for immersive communications

A first-order DirAC-based parametric Ambisonic coder for imm...

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2025 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2025

作者： Fuchs, Guillaume Ghido, Florin Weckbecker, Dominik Thiergart, Oliver Fraunhofer IIS Erlangen Germany

ISBN: (纸本)9798350368741

Directional audio coding (DirAC) is a proven method for parametrically representing a 3D audio scene in B-format and is capable of reproducing it on arbitrary loudspeaker layouts. Although such a method seems well suited for low bitrate Ambisonic transmission, little work has been done on the feasibility of building a real system upon it. In this paper, we present a DirAC-based coding for Higher-Order Ambisonics (HOA), developed as part of a standardisation effort to extend the 3GPP EVS codec to immersive communications. Starting from the first-order DirAC model, we show how to reduce algorithmic delay, the bitrate required for the parameters and complexity by bringing the full synthesis in the spherical harmonic domain. The evaluation of the proposed technique for coding 3rd order Ambisonics at bitrates from 32 to 128 kbps shows the relevance of the parametric approach compared with existing solutions. © 2025 IEEE.

关键词： Ambisonics directional audio coding (DirAC) higher-order Ambisonics (HOA) spatial audio coding

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Experimental Study of MPEG Surround for Stereo audio Transmission 5

Experimental Study of MPEG Surround for Stereo Audio Transmi...

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5th International Conference on Information Technology Systems and Innovation (ICITSI)

作者： Luthfi, Amirul Permana, Al Kautsar Saputra, Oki Elfitri, Ikhwana Univ Andalas Dept Elect Engn Padang Indonesia Univ Jambi Dept Elect Engn Jambi Indonesia Inst Teknol Bandung Sch Elect Engn & Informat Bandung Indonesia

ISBN: (纸本)9781538656938

MPEG Surround (MPS) has been well-known for years as a standard for encoding multichannel audio signals based on the concept of spatial audio coding. It is normally used for 5.1 audio channels or even higher number of audio channels. However, as a modular encoding system, it is also possible to employ MPS for encoding lower number of audio channels such as for stereo audio signals. In this study, MPEG Surround is operated for encoding stereo audio signals at low bitrates. The reverse one-to-two (R-OTT), a module applied in the MPEG Surround to down-mix two channels as a single channel, is employed as a single block to process stereo audio signal. Using a single R-OTT module in the encoder and a single OTT module in the decoder, performance of MPS to compress stereo audio can be analyzed. The objective results show that employing single block R-OTT, MPEG Surround can outperform HE-AAC+ Parametric Stereo (PS) at very low bitrate 24 kb/s. At the same time, it also provides good performance over HE-AAC at bitrate 32 - 64 kb/s.

关键词： spatial audio coding MPEG Surround Stereo audio

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