Advanced Combined Parametric Stereo Audio Encoder and Decoder, Advanced Combined Parametric Stereo Audio Coding and Replication ADVANCED PARAMETRIC STEREO AUDIO DECODING AND SPECTRUM BAND REPLICATION METHOD AND COMPUTER-READABLE STORAGE

摘要

encoding an audio signal is provided wherein the audio signal includes a first audio channel and a second audio channel, the encoding including subband filtering each of the first audio channel and the second audio channel in a bank. complex modulated filter to provide a first plurality of subband signals for the first audio channel and a second plurality of subband signals for the second audio channel, sub-sampling each of the subband signals to providing a first plurality of sub-sampled subband signals and a second plurality of sub-sampled subband signals, additionally sub-filtering at least one of the sub-sampled subband signals in a filter bank in order to provide a plurality of sub-subband signals, derive spatial parameters from the sub-subband signals and those sub-sampled subband signals that are not additionally sub-filtered, and derive a sign of single channel audio including derived subband signals derived from the first plurality of sub-sampled subband signals and the second plurality of sub-sampled subband signals. Additionally, decoding is provided wherein an encoded audio signal including an encoded single channel audio channel and a spatial parameter set is decoded, decoding the encoded single channel audio channel to obtain a plurality of sub-subband signals. additionally filtering at least one of the sub-sampled subband signals in an additional filter bank to provide a plurality of sub-subband signals, and deriving two audio channels from the parameters. sub-band signals and those sub-sampled sub-band signals that are not additionally sub-band filtered.