| 摘要 |
A method and an apparatus to recover a high frequency component of an MP3 encoded audio signal in an audio decoder. The method includes: generating a filter bank value of a low frequency band from a modified discrete cosine transform (MDCT) coefficient, which is extracted from an input bitstream according to a window type, extracting transient information of a frame according to the window type and selecting a weight coefficient according to the extracted transient information, recovering a filter bank value of a lost high frequency band from the generated filter bank value of the low frequency band, and adjusting the recovered filter bank value of recovered high frequency components according to the weight coefficient.
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