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检索条件"主题词=Audio coding"

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A Multichannel Linear Prediction Method for the MPEG-4 ALS Compliant Encoder

A Multichannel Linear Prediction Method for the MPEG-4 ALS C...

引用

IEEE Workshop on Applications of Signal Processing to audio and Acoustics

作者： Yutaka Kamamoto Noboru Harada Takehiro Moriya NTT Communication Science Laboratories Nippon Telegraph and Telephone Corporation Atsugi Kanagawa Japan

A new linear prediction analysis method for multichannel signals was devised, with the goal of enhancing the compression performance of the MPEG-4 audio Lossless coding (ALS) compliant encoder. The multichannel coding tool for this standard carries out an adaptively weighted subtraction of the residual signals of the coding channel from those of the reference channel, both of which are produced by independent linear prediction. Our linear prediction method tries to directly minimize the amplitude of the predicted residual signal after subtraction of the signals of the coding channel. The results of a comprehensive evaluation show that this method yields a 0.1% smaller compressed file size averagely, the maximum improvement of compression ratio achieves 14.6%, at the cost of a small increase in computational complexity at the encoder and without increase in decoding time. This is a practical method because the compressed bit stream remains compliant with the MPEG-4 ALS standard.

关键词： Prediction methods MPEG 4 Standard Decoding Signal analysis Performance analysis Entropy coding IEC standards ISO standards audio coding Signal processing

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An Improved MDCT IP Core Generator with Architectural Model Simulation

An Improved MDCT IP Core Generator with Architectural Model ...

引用

IEEE Design and Diagnostics of Electronic Circuits and Systems (DDECS)

作者： Peter Malik Marcel Balaz Tomas Pikula Martin Simlastik Institute of Informatics Slovak Academy of Sciences Bratislava Slovakia

Compression of digital audio signals has become very important audio computation process. When audio data are compressed it is possible to store more data in a smaller memory and to increase the overall audio data throughput transferred through an interface. Several compression schemes were developed and well established. Most of them adopt the MDCT/IMDCT. This paper presents an software tool, an improved MDCT IP core generator with architectural model simulation that is capable to generate several MDCT architectures with adjustable parameters for FPGA-based design. The software tool has integrated functions of the computation precision and area estimation, which facilitate and speed up the design process.

关键词： Signal processing algorithms Digital audio players Software tools Computer architecture Circuits audio coding Frequency Computational modeling Signal processing Process design

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Perceptual Enhancement for Fully Scalable audio

Perceptual Enhancement for Fully Scalable Audio

引用

IEEE Workshop on Multimedia Signal Processing

作者： Te Li Susanto Rahardja Soo Ngee Koh Institute for Infocomm Research Singapore Nanyang Technological University Singapore

ISBN: (纸本)9781424412730

MPEG-4 Scalable Lossless (SLS) coding is the latest released ISO international standard for scalable audio coding. Besides its function as an extension of MPEG-4 Advanced audio coding (AAC) perceptual audio coder, SLS has a "non-core mode" that is able to offer full scalability. The perceptual audio coder is absent in this mode and scalability is achieved through pure bit-plane coding. In this paper, a perceptually enhanced bit-plane coding method, namely Quad-level Bit-Plane coding (QBPC) is proposed to enhance the perceptual quality of fully scalable audio at intermediate bitrates. With QBPC structure, the perceptual quality of fully scalable audio coded by SLS is significantly improved in a wide range of intermediate bitrates. Meanwhile this is achieved with trivial added overhead and complexity.

关键词： Laser sintering audio coding Frequency conversion MPEG 4 Standard Scalability Bit rate ISO standards Tellurium Transcoding Image coding

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Watermarking of AAC Bit-streams for Forensic Tracking

Watermarking of AAC Bit-streams for Forensic Tracking

引用

IEEE Signal Processing and Communications Applications (SIU)

作者： Serap Kirbiz Mehmet Celik Aweke Lemma Stefan Katzenbeisser ITÜ Elektrik Elektronik Fakültesi Telekomünikasyon Mühendisliği Bölümü Maslak Istanbul Turkey Philips Research Europe Eindhoven Netherlands

We propose a novel method for embedding robust forensic tracking watermarks to complement encryption in electronic music distribution applications. The watermark is embedded at the player during the AAC decoding process through modification of scale-factors in pre-defined frequency bands. It thereby modulates the short-time envelope of the decoded audio in the corresponding band. The resulting watermark is robust to various attacks such as re-compression and acoustic transmission. The method, due to its negligible computational overhead, can be used in resource constrained devices such as portable players.

关键词： Watermarking Forensics Internet audio coding Robustness Decoding Remuneration Information security Europe Cryptography

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A Novel audio Codec for Mobile Multimedia Applications

A Novel Audio Codec for Mobile Multimedia Applications

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第三届IEEE无线通讯、网络技术暨移动计算国际会议

作者： Cong Zhang RuiMin Hu School of Computer Wuhan University Wuhan China National Engineering Research Center for Multimedia Software Wuhan University Wuhan China

During the last decade, new mobile multimedia applications have emerged for mobile and network multimedia, wireless multimedia communication, audio/video teleconferencing, remote assistance, digital storage systems, secure audio transmission and so on. In order to meet these requirements, tremendous research efforts have been put in the development of efficient digital audio coding technologies. In China, AVS-M audio standard is such an audio technology targeting for mobile multimedia applications which is developed and owned by China audio and Video coding Standard Workgroup. In this paper, AVS-M audio standard is discussed by revealing the technical principles of the en- and decoding, the standardization situation and the suitability of the codec in relation to technology available, economical feasibility and the market needs. Finally it concludes with a brief discussion of future research directions.

关键词： AVS-M audio coding 3GPP

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Introduction to Digital audio coding and Standards [Book Review]

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IEEE Circuits and Devices Magazine 2004年第6期20卷 52-53页

作者： D. Lingaiah Cranes Software International Limited Bangalore

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Improved integer transforms using multi-dimensional lifting [audio coding examples]

Improved integer transforms using multi-dimensional lifting ...

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

作者： R. Geiger Y. Yokotani G. Schuller J. Herre Fraunhofer IIS AEMT Ilmenau Germany Electrical Engineering Department University of Texas Arlington Arlington TX USA Fraunhofer IIS Erlangen Germany

Recently lifting-based integer transforms have received much attention, especially in the area of lossless audio and image coding. The usual approach is to apply the lifting scheme to each Givens rotation. Especially in the case of long transform sizes in audio coding applications, this leads to a considerable approximation error in the frequency domain. This paper presents a multidimensional lifting approach for reducing this approximation error. In this approach, large parts of the transform are calculated without rounding operations, only the output is rounded and added. The new approach is applied and evaluated for both the integer modified discrete cosine transform (IntMDCT) and the integer fast Fourier transform (IntFFT).

关键词： Matrix decomposition Approximation error audio coding Discrete transforms Computational complexity Image coding Discrete cosine transforms Fast Fourier transforms Roundoff errors Frequency domain analysis

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Rate-distortion efficient amplitude modulated sinusoidal audio coding

Rate-distortion efficient amplitude modulated sinusoidal aud...

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Asilomar Conference on Signals, Systems & Computers

作者： M.G. Christensen S. van de Par Department of Communication Technology University of Aalborg Denmark Digital Signal Processing Group Philips Research Laboratories Netherlands

In this paper, an improved parametric audio coder is presented. This coder addresses an important issue in audio coding, namely handling of transients. We propose a dedicated coder for transients based on amplitude modulated sinusoids. This coder is then combined with a constant-amplitude sinusoidal coder, and by rate-distortion optimization we choose which of the two is used for each segment. We show by rate-distortion curves and listening tests that the proposed coder offers significant improvements as compared to the constant-amplitude coder.

关键词： Rate-distortion Amplitude modulation Modulation coding audio coding Digital signal processing Phase modulation Communications technology Testing audio recording Context modeling

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A scalable lossy to lossless audio coder for MPEG-4 lossless audio coding

A scalable lossy to lossless audio coder for MPEG-4 lossless...

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

作者： Rongshan Yu Xiao Lin S. Rahardja C.C. Ko Institute for Infocomm Research Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore

In this paper, we present Advanced audio Zip (AAZ), a scalable lossless audio coding technology that was recently selected as the reference model for MPEG audio scalable lossless coding (SLS) work. AAZ provides excellent compression performance while delivering fine grain bit-rate scalability from lossy to lossless coding. Moreover, AAZ provides backward compatibility to the MPEG advanced audio coding (AAC) system by embedding an AAC compliant bit-stream into the lossless bit-stream. As a result, AAZ serves as a universal coding solution with functionalities that were previously offered by several distinct audio coding technologies such as lossless audio coding, perceptual audio coding, or scalable audio coding; and maximizes the interchangeability for digital audio contents migrating among these application domains.

关键词： MPEG 4 Standard audio coding audio compression Transform coding Scalability Bandwidth Application software Laser sintering Performance loss Streaming media

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A hybrid parametric-waveform approach to bit stream scalable audio coding

A hybrid parametric-waveform approach to bit stream scalable...

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Asilomar Conference on Signals, Systems & Computers

作者： F. Riera-Palou A.C. den Brinker A.J. Gerrits Philips Research Laboratories Eindhoven Netherlands

In this paper we present a wideband (44.1 kHz sampling rate) audio and speech coder that combines two different strategies, namely, parametric and waveform coding. It is shown how this approach can be used to design a layered bit stream scalable coder offering a wide variety of decoding bit rates with little scalability loss. Moreover, the bit rates associated with the different layers are competitive, in terms of quality, to those of standardized coders (MP3, AAC) tuned at a particular bit rate.

关键词： Streaming media audio coding Bit rate Decoding Scalability Digital audio players Speech coding Internet Laboratories Wideband

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