The Experts below are selected from a list of 2625 Experts worldwide ranked by ideXlab platform
Karlheinz Brandenburg - One of the best experts on this subject based on the ideXlab platform.
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perceptual coding of high Quality digital Audio
Proceedings of the IEEE, 2013Co-Authors: Karlheinz Brandenburg, Jürgen Herre, C Faller, James D Johnston, W B KleijnAbstract:This paper introduces high-Quality Audio coding using psychoacoustic models. This technology is now abundant, with gadgets named after a standard (mp3 players) and the ability to play high-Quality Audio from literally billions of devices. The usual paradigm for these systems is based on filterbanks, followed by quantization and coding, controlled by a model of human hearing. The paper describes the basic technology, theoretical framework to apply to check for optimality, and the most prominent standards built on the basic ideas and newer work.
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MPEG-4 natural Audio coding
Signal Processing-image Communication, 2002Co-Authors: Karlheinz Brandenburg, Oliver Kunz, Akihiko SugiyamaAbstract:MPEG-4 Audio represents a new kind of Audio coding standard. Unlike its predecessors, MPEG-1 and MPEG-2 high-Quality Audio coding, and unlike the speech coding standards which have been completed by the ITU-T, it describes not a single or small set of highly efficient compression schemes but a complete toolbox to do everything from low bit-rate speech coding to high-Quality Audio coding or music synthesis. The natural coding part within MPEG-4 Audio describes traditional type speech and high-Quality Audio coding algorithms and their combination to enable new functionalities like scalability (hierarchical coding) across the boundaries of coding algorithms. This paper gives an overview of the basic algorithms and how they can be combined.
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Encoding considerations for MP3 and MPEG‐2/MPEG‐4 advanced Audio coding
Journal of the Acoustical Society of America, 2000Co-Authors: Karlheinz BrandenburgAbstract:Perceptual coding of high‐Quality Audio has found widespread applications for broadcasting, internet delivery of music and storage of music as used in portable music players. The success of formats like MPEG‐1 Layer‐3 (AKA MP3) can be attributed to the standardization philosophy of MPEG: A universal format is specified and available for licensing for everybody. This leaves the encoder up to technical improvements. The presentation will (i) introduce the basics of high‐Quality Audio coding, (ii) give an overview on MP3 and MPEG‐2/4 AAC, (iii) explain encoding strategies, and (iv) give special consideration to parameters affecting coding Quality.
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Audio Compression for Network Transmission
Journal of The Audio Engineering Society, 1996Co-Authors: Martin Dietz, Karlheinz Brandenburg, Harald Popp, Robert FriedrichAbstract:For real-time as well as off-line transmission of high-Quality Audio signals over the Internet, the best Quality at very low bit rate is desired. MPEG-2 Layer 3 Audio supports close to FM stereo Quality (11-kHz bandwidth, 24-kHz sampling frequency) at 64 kbit/s total bit rate using advanced stereo coding techniques. The decoder supports real-time decoding on workstations or fast PCs. Different implementations of the encoder and the decoder and their use for Internet transmission of high-Quality Audio are described.
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Perceptual coding of height-Quality Audio signals
Journal of the Acoustical Society of America, 1994Co-Authors: Karlheinz BrandenburgAbstract:Perceptual coders promise to deliver true transparent coding. The listener should not be able to hear any difference between original and reconstructed signal. The main elements of perceptual coders are (1) a filterbank to map the time domain input signal to a time‐ frequency domain representation, (i.e., the masked threshold) and (2) the quantization and coding step that should include proper noise shaping according to the psychoacoustic model. An overview of current and future Audio coding systems is given. The completion of ISO/IEC 11172‐3 (the MPEG‐1 Audio coding standard) marks the end of the work on the first generation of Audio coding systems. While Audio coding is on the way to widespread application, topics for the new coding systems include joint stereo coding of two or more channels, different analysis‐by‐synthesis systems, and improved psychoacoustic models.
Yannick Mahieux - One of the best experts on this subject based on the ideXlab platform.
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high Quality Audio transform coding at 64 kbps
IEEE Transactions on Communications, 1994Co-Authors: Yannick Mahieux, J P PetitAbstract:This paper presents a transform coding algorithm devoted to high Quality Audio coding at a bit rate of 64 kbps per monophonic channel. It enables the transmission of a high Quality stereo sound through the basic access (2B channels) of ISDN. Although a complete system including framing, synchronization and error correction has been developed, only the bit rate compression algorithm is described here. A detailed analysis of the signal processing techniques such as the time/frequency transformation, the pre-echo reduction by adaptive filtering, the fast algorithm computations, etc., is provided. The use of psychoacoustical properties is also precisely reported. Finally, some subjective evaluation results and one real time implementation of the coder using the ATT DSP32C digital signal processor are presented. >
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High Quality Audio transform coding at 64 kbit/s
Annales Des Télécommunications, 1992Co-Authors: Yannick MahieuxAbstract:This paper presents a transform coding algorithm designed for Audio coding at a bit rate of 64 kbit/s. It enables the transmission of a high Quality stereo sound through the 2B channels of isdn. Although a complete system including framing, synchronization and error correction has been developed, only the bit rate compression algorithm is described here. A detailed analysis of the signal processing techniques such as the time/frequency transformation, the preecho reduction by adaptive filtering, the fast algorithm computations…, is provided. The use of psychoacoustical properties is also precisely reported. Finally, some subjective evaluation results and one real time implementation of the coder using the att dsp52c digital signal processor are presented.RésuméCet article présente un algorithme de codage par transformation pour la transmission de signaux sonores de haute qualité à 64 kbit/s. Il permet le transport d’un son stéréo de haute qualité au travers de l’accès de base du rnis. Quoiqu’un système de codage complet incluant la synchronisation, la protection contre les erreurs…, ait été développé, seul l’algorithme de compression de débit est décrit ici. Une analyse détaillée des techniques de traitement du signal employées : transformation temps/fréquence, réduction des prééchos par filtrage adaptatif, algorithmes rapides,… est fournie. La prise en compte des propriétés psychoacoustiques dans l’algorithme de codage est également décrite en détail. Enfin, les performances de ce codeur en termes de qualité subjective sont évoquées ainsi que son implantation sur processeur de signal.
Ashwani Kumar - One of the best experts on this subject based on the ideXlab platform.
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Design, implementation, and evaluation of the Audio/video distribution transport protocol (AVDTP) for high Quality Audio support over Bluetooth
Computer Communications, 2005Co-Authors: Sherali Zeadally, Ashwani KumarAbstract:In recent years, we have seen wide adoption of wireless local area networks frequently used as extensions to the Internet to enable ubiquitous information access anywhere, anytime. Networks such as IEEE 802.11 and Bluetooth are extensively being deployed in the local area and personal area networking environments, respectively. For seamless connectivity to the Internet, these networks are expected to transport different types of traffic often involving various media (Audio, video, images). Our goal is to enable the effective transfer of high Quality Audio in Bluetooth Personal Area Networks (PANs). Most of the functionalities required for Audio/video streaming over Bluetooth are specified by the Bluetooth Audio/Video Distribution Transport Protocol (AVDTP) specification standard. We have designed and implemented AVDTP for high-Quality Audio support over Bluetooth networks. We also present and discuss a performance evaluation of our AVDTP implementation.
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Design, implementation, and evaluation of the Audio/video distribution transport protocol (AVDTP) for high Quality Audio support over Bluetooth
Computer Communications, 2005Co-Authors: Sherali Zeadally, Ashwani KumarAbstract:In recent years, we have seen wide adoption of wireless local area networks frequently used as extensions to the Internet to enable ubiquitous information access anywhere, anytime. Networks such as IEEE 802.11 and Bluetooth are extensively being deployed in the local area and personal area networking environments, respectively. For seamless connectivity to the Internet, these networks are expected to transport different types of traffic often involving various media (Audio, video, images). Our goal is to enable the effective transfer of high Quality Audio in Bluetooth Personal Area Networks (PANs). Most of the functionalities required for Audio/video streaming over Bluetooth are specified by the Bluetooth Audio/Video Distribution Transport Protocol (AVDTP) specification standard. We have designed and implemented AVDTP for high-Quality Audio support over Bluetooth networks. We also present and discuss a performance evaluation of our AVDTP implementation. ?? 2004 Elsevier B.V. All rights reserved.
Leah H. Jamieson - One of the best experts on this subject based on the ideXlab platform.
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High-Quality Audio compression using an adaptive wavelet packet decomposition and psychoacoustic modeling
IEEE Transactions on Signal Processing, 1998Co-Authors: Pramila Srinivasan, Leah H. JamiesonAbstract:This paper presents a technique to incorporate psychoacoustic models into an adaptive wavelet packet scheme to achieve perceptually transparent compression of high-Quality (34.1 kHz) Audio signals at about 45 kb/s. The filter bank structure adapts according to psychoacoustic criteria and according to the computational complexity that is available at the decoder. This permits software implementations that can perform according to the computational power available in order to achieve real time coding/decoding. The bit allocation scheme is an adapted zero-tree algorithm that also takes input from the psychoacoustic model. The measure of performance is a quantity called subband perceptual rate, which the filter bank structure adapts to approach the perceptual entropy (PE) as closely as possible. In addition, this method is also amenable to progressive transmission, that is, it can achieve the best Quality of reconstruction possible considering the size of the bit stream available at the encoder. The result is a variable-rate compression scheme for high-Quality Audio that takes into account the allowed computational complexity, the available bit-budget, and the psychoacoustic criteria for transparent coding. This paper thus provides a novel scheme to marry the results in wavelet packets and perceptual coding to construct an algorithm that is well suited to high-Quality Audio transfer for Internet and storage applications ER -
Sherali Zeadally - One of the best experts on this subject based on the ideXlab platform.
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Design, implementation, and evaluation of the Audio/video distribution transport protocol (AVDTP) for high Quality Audio support over Bluetooth
Computer Communications, 2005Co-Authors: Sherali Zeadally, Ashwani KumarAbstract:In recent years, we have seen wide adoption of wireless local area networks frequently used as extensions to the Internet to enable ubiquitous information access anywhere, anytime. Networks such as IEEE 802.11 and Bluetooth are extensively being deployed in the local area and personal area networking environments, respectively. For seamless connectivity to the Internet, these networks are expected to transport different types of traffic often involving various media (Audio, video, images). Our goal is to enable the effective transfer of high Quality Audio in Bluetooth Personal Area Networks (PANs). Most of the functionalities required for Audio/video streaming over Bluetooth are specified by the Bluetooth Audio/Video Distribution Transport Protocol (AVDTP) specification standard. We have designed and implemented AVDTP for high-Quality Audio support over Bluetooth networks. We also present and discuss a performance evaluation of our AVDTP implementation.
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Design, implementation, and evaluation of the Audio/video distribution transport protocol (AVDTP) for high Quality Audio support over Bluetooth
Computer Communications, 2005Co-Authors: Sherali Zeadally, Ashwani KumarAbstract:In recent years, we have seen wide adoption of wireless local area networks frequently used as extensions to the Internet to enable ubiquitous information access anywhere, anytime. Networks such as IEEE 802.11 and Bluetooth are extensively being deployed in the local area and personal area networking environments, respectively. For seamless connectivity to the Internet, these networks are expected to transport different types of traffic often involving various media (Audio, video, images). Our goal is to enable the effective transfer of high Quality Audio in Bluetooth Personal Area Networks (PANs). Most of the functionalities required for Audio/video streaming over Bluetooth are specified by the Bluetooth Audio/Video Distribution Transport Protocol (AVDTP) specification standard. We have designed and implemented AVDTP for high-Quality Audio support over Bluetooth networks. We also present and discuss a performance evaluation of our AVDTP implementation. ?? 2004 Elsevier B.V. All rights reserved.
