Last Updated: 20060821, mei
P7 - Posters: Audio Coding
Friday, October 6, 9:00 am — 10:30 am
P7-1 Error-Robust Frame Splitting for Audio Streaming Over the Lossy Packet Network—Jong Kyu Kim, Hwan Sik Yun, Jung Su Kim, Seoul National University - Seoul, Korea; Joon Hyuk Chang, Inha University - Incheon, Korea; Nam Soo Kim, Seoul National University - Seoul, Korea
In this paper we propose a novel audio streaming scheme for the perceptual audio coder over the packet-switching network. Each frame is split into several subframes, which are independently decoded based on the specified packet size for robust error concealment. We further improve the subframe splitting techniques by allocating the spectral lines to each subframe adaptively. Through an informal listening test, it was discovered that our approach enhances audio signals under the lossy packet network environments.
Convention Paper 6893 (Purchase now)
P7-2 Adaptive Filter Banks Using Fixed Size MDCT and Subband Merging for Audio Coding—Comparison with the MPEG AAC Filter Banks—Ewen Camberlein, Pierrick Philippe, France Télécom R&D - Cesson-Sévigné, France; Frederic Bimbot, IRISA - Rennes, France
The MPEG Audio AAC Standard uses two MDCT sizes and transition windows in order to adapt these uniform transforms to the signal specifics. We present a new adaptation scheme based on a fixed size MDCT where subband merging is applied in order to obtain appropriate temporal resolution on chosen parts of the spectrum. The performances of the proposed approach are evaluated, with respect to the AAC, thanks to an objective measure, which takes into account the temporal masking effect.
Convention Paper 6894 (Purchase now)
P7-3 An Audio Archiving Format Based on the MPEG-4 Audio Lossless Coding—Noboru Harada, Takehiro Moriya, Yutaka Kamamoto, NTT Communication Science Labs. - Atsugi, Kanagawa, Japan
An audio archiving tool using MPEG-4 audio lossless coding as the encoding engine offers the excellent compression performance and functionality for handling several audio files as one archived file. The archiving tool is suitable for a variety of applications. Test results show that the compression performance of the proposed tool is much better than that of ZIP when the input data are audio files. This application format for the archiving tool has been proposed to the MPEG-A and is being discussed as one of the multimedia application formats under development.
Convention Paper 6895 (Purchase now)
P7-4 Quality Improvement of a Scalable Audio Codec Based on a Phase Estimation Technique for Reconstructed Harmonic Structure—Wei-Chen Chang, Alvin Su, National Cheng-Kung University - Tainan, Taiwan
A spectral oriented trees-based audio coder with harmonic structure reconstruction was proposed recently. Its fine scalability, low complexity, and almost MP3 quality make it suitable for internet applications. However, during the reconstruction process, the phase information of the reconstructed coefficients is absent. This may create phase discontinuities between two adjacent frames. It is audible in listening tests and the objective grades are degraded for many testing sources. In this paper we proposed a new inter/intra frame estimation method to reduce the problem and a refined harmonic reconstruction method is also applied. The quality improvement is significant. It outperforms the method in [the above mentioned paper] and its performance is closer to the popular MP3 Pro for many audio music sources.
Convention Paper 6896 (Purchase now)