In the course of the 'MPEG-4 Extension 2' standardisation process, a parametric coding scheme is under development. This coding scheme is based on the notion that any audio signal can be dissected into three objects: transient, sinusoids and noise. Each of these objects allows for an efficient parametric representation. The parametric coder is targeting medium to high quality for CD quality material, at bit-rates ranging from 24 ' 40 kbit/s stereo. Recently, improvements have been made to increase the overall performance of the coder. One of these improvements consists of an improved model for the noise object. Furthermore, a very efficient representation for the stereo image has been defined. In this paper, all recent improvements will be discussed.

Authors: Oomen, Werner; Schuijers, Erik; den Brinker, Bert; Breebaart, Jeroen
Affiliations: Philips Digital Systems Laboratories, Eindhoven, The Netherlands ; Philips Research Laboratories, Eindhoven, The Netherlands(See document for exact affiliation information.)
AES Convention: 114 (March 2003) Paper Number: 5852
Publication Date: March 1, 2003
Subject: Low Bit-Rate Coding

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