Cross-Layer Rate-Distortion Optimization for Scalable Advanced Audio Coding

•where •P : set of AAC parameters scalefactors (SFs) + Huffman codebooks (HCBs) for both layers and all frames •R(b)(P),R(e)(P) : bitrate in each layer •D(b)(P), D(e)(P) : distortion in each layer, the distortion measure is the Maximum-Maximum NMR (MMNMR). •R t ,R (e) t : target bitrate in each layer •D t , D (e) t : target distortion in each layer •α, β : parameters that control the performance trade-off Optimal solution for the single layer case