MPEG-4 ALS is a lossless coding standard for audio signals based on time-domain prediction, and it was officially published in March 2006. Enhanced encoder algorithms and implementation examples of the MPEG-4 ALS are shown in this paper. To reduce the computational complexity of the encoder, new algorithms have been developed for the multi-channel prediction coding (MCC) tool, the long-term prediction (LTP) tool, and the hierarchical block switching (BS) tool. In addition, processing speed has been enhanced by means of software optimization, including assembler codes. As a result of these improvements, the software provides maximally 10 times faster encoding speed than that of the MPEG reference software and becomes more useful for various practical applications.
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.