| 主权项 |
1. An audio coding device comprising:
a memory; and a processor configured to execute a plurality of instructions stored in the memory, the instructions comprising:
selecting a main lobe among a plurality of lobes detected from a frequency signal configuring an audio signal on a basis of bandwidth and power of the plurality of lobes; andcoding the audio signal in such a manner that a first amount of bits per a unit frequency domain allocated to coding of a frequency signal of the main lobe selected is larger than a second amount of bits per a unit frequency domain allocated to coding of a frequency signal of a side lobe as a lobe other than the main lobe until an amount of bits relating to the coding is within a bit rate, wherein the selecting includes:
prescribing, as a threshold, a value of a first inflection point at which the power is lowest in an inflection point group in the plurality of lobes,prescribing, as a threshold, a value obtained by increasing in the power by a predetermined value from the threshold prescribed as the value of the first inflection point, andselecting, in the inflection point group, a third inflection point and a fourth inflection point as a start point and an end point of the main lobe, respectively, the third inflection point and the fourth inflection point being adjacent to a second inflection point at which the power is highest, on a lower frequency side and a higher frequency side, respectively, each of the third inflection point and the fourth inflection point having a value that is equal to or larger than the threshold prescribed as the value of the first inflection point and is smaller than the threshold prescribed as the value according to the increasing. |
