A perceptual encoder divides an audio signal into successive time blocks, each time block is divided into frequency bands, and a scale factor is assigned to each of ones of the frequency bands. Bits per block increase with scale factor values and band-to-band variations in scale factor values. A preliminary...http://www.google.fr/patents/US7272566?utm_source=gb-gplus-shareBrevet US7272566 - Reducing scale factor transmission cost for MPEG-2 advanced audio coding (AAC) using a lattice based post processing technique
