Patent ID: 8620673

Claim:
An audio decoding method, comprising: determining, by a decoding end, that bitstreams to be decoded are monophony coding layer and first stereo enhancement layer bitstreams, wherein the decoding end does not receive any other enhancement layer bitstreams other than the first stereo enhancement layer bitstream, and wherein the first stereo enhancement layer comprises left and right residual signals; decoding, by the decoding end, the monophony coding layer bitstream to obtain a monophony decoded frequency-domain signal; reconstructing, by the decoding end, left and right channel frequency-domain signals in a first sub-band region by utilizing the monophony decoded frequency-domain signal after an energy adjustment has been applied, wherein left and right channel residual signals in the first sub-band region are included in the first stereo enhancement layer bitstreams and obtained by the decoding end and wherein first sub-band region is the region of a first number of subbands comprising the lower frequency spectrum where energy enhancement is performed; and reconstructing, by the decoding end, left and right channel frequency-domain signals in a second sub-band region by utilizing the monophony decoded frequency-domain signal without the energy adjustment being applied, wherein left and right channel residual signals in the second sub-band region are not obtained by the decoding end and wherein second sub-band region is the region of second number of subbands comprising the higher frequency spectrum where no energy enhancement is performed.