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.
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.