| 摘要 |
In an audio encoding system that divides frames generated from input signals into multiple scale factor bands and that encodes each of the scale factor bands by using a scale factor, the invention provides a rate control apparatus that performs rate control based on an NMR, the rate control apparatus comprising an NMR determination unit that determines an NMR that does not exceed a target rate by a binary search; and a scale factor determination unit that determines, by a binary search, the largest scale factor corresponding to the NMR determined by the NMR determination unit and a rate. Each time the NMR determination unit selects an NMR candidate value that acts as a candidate when the NMR determination unit searches for an NMR by a binary search, the scale factor determination unit determines the scale factor corresponding to the NMR candidate value. |
