STEREO AUDIO CODING METHOD, APPARATUS THEREOF, DECODING METHOD AND APPARATUS THEREOF

摘要

PURPOSE: A stereo audio coding method, an apparatus thereof, a decoding method and an apparatus thereof are provided to supply more stable sound quality at a low frequency bandwidth and encode stereo audio into less bits. CONSTITUTION: A conversion unit(11) converts audio samples obtained from a plurality of channels, respectively. A psychological sound unit(12) supplies attack sensing information to the conversion unit(11), ties the converted audio signal as proper subband signals, calculates a masking threshold in each subband by using the masking phenomenon due to the interaction of each signal and then supplies the calculated value to a quantizing unit(13). The quantizing unit(13) quantizes correlation cancellation samples of each band on the basis of corresponding scale factor information and supplies the quantized samples. A bit packing unit(14) codes the quantized samples without loss and packages the coded samples by the unit of frame.