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.
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