Workshop W-6 at the AES 110th Convention, Amsterdam, May 13th, 2001
Chairman: Jürgen Herre
Contrary to previous well-known MPEG coding standards (such as MPEG-1, MPEG-2 and MPEG-4), MPEG-7 goes beyond the domain of audiovisual coding and focuses on efficient search and retrieval, filtering and semantic description of content. The workshop will try to give a timely update on this ongoing standardization process by explaining its overall concepts and discussing the technical components of the proposed standard. This will be complemented by examples for attractive potential applications and prototype demonstrations.
See also: Workshop sessions at the AES 110th Convention
See also: Latest Version of the MPEG-4 Overview on the MPEG home page
Workshop W10 at the AES 106th Convention, Munich, May 10th, 1999
Chairman: Schuyler Quackenbush
MPEG-4 is the most recent member of the well known family of ISO/MPEG coding standards. MPEG-4 provides an integrated set of audio coders with a number of novel functionalities, such as bitrate scalability and bandwidth scalability. It also supports new concepts in audio coding systems, such as multi-signal composition and interactive signal post-processing. The workshop will present an overview of the MPEG-4 audio standard and discuss how MPEG-4 can be used in specific audio applications. The workshop will attempt to answer the question "What is MPEG-4 and what can I do with it?" There will be a number of demonstrations.
See also: Workshop sessions at the AES 106th Convention
Workshop W3 at the AES 108th Convention, Paris, February 19th, 2000
Chairman: Jürgen Herre
MPEG-4 is the most recent member of the well-known family of ISO/MPEG coding standards, and provides an integrated set of audio coders with attractive capabilities, including bit-rate and bandwidth scalability. After the release of the MPEG-4 standard in 1999, the new Version 2 Standards Addendum, to be published in 2000, defines extended functionalities, such as low delay audio coding, parametric audio coding, error resilience and spatialization. The workshop aims at answering the questions "what is MPEG-4 v2 and what can I do with it?" and includes a number of demonstrations.
See also: Workshop sessions at the AES 108th Convention
Session 3 at the AES 17th Conference: High Quality Audio Coding, Signa, Italy, September 4th, 1999
Karlheinz Brandenburg: MP3 and AAC explained (Full paper available via MPEG Home Page (PDF))
The last years have shown widespread proliferation of .mp3-files, both from legal and illegal sources. Yet most people using these audio files do not know much about audio compression and how to use it. The paper gives an introduction to audio compression for music file exchange. Beyond the basics the focus is on quality issues and the compression ratio / audio bandwidth / artifacts tradeoffs.
Session 4 at the AES 17th Conference: High Quality Audio Coding, Signa, Italy, September 4th, 1999
Masayuki Nishiguchi: MPEG-4 speech coding (Presentation slides (PDF))
MPEG-4 Audio standard (ISO/IEC 14496-3) supports highly efficient representation of speech signals at 2.0-24 kbps using two basic algorithms; Harmonic Vector eXcitation Coding (HVXC) and Code Excited Linear Prediction (CELP). This paper describes overview of MPEG-4 speech coding algorithms and new functionalities such as speed/pitch change and bit-rate scalability, which, together with high coding efficiency, distinguish MPEG-4 from other standards.
Bernhard Grill: The MPEG-4 General Audio Coder (Presentation slides (PDF))
The paper presents the MPEG-4 general audio (GA) coder which - unlike the MPEG-4 speech or synthetic coding schemes - is designed to work with any type of audio material. The GA coder includes all features of MPEG-2 AAC, plus extensions for improved coding quality at very low bitrates, including the TwinVQ scheme. In addition, embedded coding techniques, where one program is represented by a hierarchical set of coding layers, further extend the capabilities.
Heiko Purnhagen: An Overview of MPEG-4 Audio Version 2 (Presentation slides (PDF))
The MPEG-4 Audio Standard provides audio and speech coding for natural and synthetic content at bitrates ranging from 2 to 64 kbit/s and above. While the first version of MPEG-4 Audio was ffinalizedin 1998, work continues for Version 2, complementing MPEG-4 Audio by the following new tools: Error Resilience, Low-Delay Audio Coding, Small Step Scalability, Parametric Audio Coding, and Environmental Spatialisation.
See also: All paper abstracts (The full papers are available in the AES 17th Conference Proceedings)
Vancouver, BC, CA, July 17th, 1999
See also: All seminar slides on the MPEG home page
Heiko Purnhagen 01-Jun-2001