AUDIO DECODING DEVICE, DECODING METHOD, AND PROGRAM

摘要

An audio decoding device includes an energy correction unit (105) for correcting a target energy of a higher band component and a correction coefficient calculation unit (106) for calculating an energy correction coefficient from a low sub-band signal. These processing units execute the correction processing of the target energy required when performing the band extension processing using only real numbers. Thus, instead of a complex sub-band synthesis filter and a complex band extension unit, it is possible to use a real number sub-band synthesis filter and a band extension unit requiring less calculation amount while maintaining a high sound quality. Thus, it is possible to reduce the necessary calculation amount and the device size.