Kristofer Kjörling

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MPEG Spectral Band Replication (SBR) is the newest compression technology available as part of the MPEG standards. It is combined with MPEG Advanced Audio Coding (AAC) and improves coding efficiency by more than 30%. The resulting scheme is called High-Efficiency AAC (HE AAC). This presentation explains MPEG SBR and its integration into the existing MPEG-4(More)
Recently, technologies for parametric coding of multi-channel audio signals have received wide attention under the name of " Spatial Audio Coding. " In contrast to a fully discrete representation of multi-channel sound, these techniques allow for a backward compatible transmission at bitrates only slightly higher than rates commonly used for mono / stereo(More)
Surround sound is on the verge of broad adoption in consumers' homes, for digital broadcasting and even for Internet services. The currently developed MPEG Surround technology offers bitrate efficient and mono/stereo compatible transmission of high-quality multi-channel audio. This enables multi-channel services for applications where mono or stereo(More)
1 At recent AES conventions, authors have had the option of submitting complete 4-to 10-page manuscripts for peer-review by subject-matter experts. The following two papers have been recognized as co-winners of the AES 132nd Convention Peer-Reviewed Paper Award. The AES has launched a new opportunity to recognize student members who author technical papers.(More)
Recommended by Antonio Ortega This paper describes novel methods for evoking a multichannel audio experience over stereo headphones. In contrast to the conventional convolution-based approach where, for example, five input channels are filtered using ten head-related transfer functions, the current approach is based on a parametric representation of the(More)
Recommended by James Kates In 2003 and 2004, the ISO/IEC MPEG standardization committee added two amendments to their MPEG-4 audio coding standard. These amendments concern parametric coding techniques and encompass Spectral Band Replication (SBR), Sinusoidal Coding (SSC), and Parametric Stereo (PS). In this paper, we will give an overview of the basic(More)
The names in bold are those of students that worked under my direct supervision. Fast recovery for a CELP-like speech codec after a frame erasure. Codage de la parole à bas et à très bas débit 2. " Annales des Télécommunications, vol. 55, n° 9-10, pp. 462-482, September 2000. [6] Philippe Gournay and Philippe Viravau. " Corrélation spectrale théorique des(More)
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