DEVICE AND METHOD FOR DETERMINING QUANTISER STEP VALUE Russian patent published in 2008 - IPC G10L19/02 

FIELD: physics.

SUBSTANCE: said utility invention relates to audio coders, in particular, to audio coders, in which time representation is converted into spectral representation. The essence of the invention is as follows: for the determination of the quantiser step for the quantisation of a signal containing audio or video information, the first quantiser step value is generated, along with the interference threshold. After that, the interference actually introduced due to the first quantiser step value is calculated and compared to the interference threshold. In spite of the fact that the comparison indicates that the actually introduced interference exceeds the threshold, the second, coarser quantiser step value is applied, which is then used for the quantisation if it is found that the interference introduced due to the coarser quantisation step value is less than the threshold or the interference introduced due to the first quantiser step value.

EFFECT: result of invention implementation is that quantisation interference decreases due to selection of coarser quantisation step value and resulting increased compression benefit.

10 cl, 5 dwg