MPEG-2 advanced audio coding which uses lattice basic post processing technology (AAC) scale factor transmission cost decrease of for the sake of

摘要

The audible audio encoder divides the audio signal to continual time block, each assistant secretary block is divided to frequency zone, scale factor is allotted to each one of frequency zone each. With fluctuation between the bands of scale factor value and scale factor value it increases the bit every of block. Temporary scale factor is decided concerning each one of frequency zone each, scale factor is optimized concerning each one of this frequency zone each, this optimization includes the fact that scale factor is made to increase to bigger value, than value of temporary scale factor concerning the frequency zone of one or more as for increase of the bit cost in the increasing, it is the same, as the decrease in the bit cost which is obtained from decrease of fluctuation between the bands in the scale factor value which is brought from increase of scale factor concerning the frequency zone of one or more or or is less than that.