Parametric Bit Allocation in a Perceptual Audio Coder
The psychoacoustically based bit allocation algorithm employed in the AC-3 multichannel audio coder is presented. This algorithm differs from previous schemes in that it combines advantages of both forward and backward adaptation. The parametric approach is based upon conveying only the essential psychoacoustic features to the decoder instead of the entire bit assignment. The technique allows a greater percentage of the bits available for coding to be applied to audio data, and enables encoder improvements without modifying the decoder.
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 temporarily free for AES members.