AACï¼Advanced Audio Codingï¼å®é
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±åå¼åçä¸ç§é³é¢æ ¼å¼ï¼å®æ¯MPEG-2è§èçä¸é¨åã
å 为âAACâæ¯ä¸ä¸ªå¤§å®¶æï¼ä»ä»¬æ¯å
±å为9ç§è§æ ¼ï¼ä»¥éåºä¸ååºåçéè¦ï¼
a) MPEG-2 AAC LC ä½å¤æ度è§æ ¼(Low Complexity)
b) MPEG-2 AAC Main 主è§æ ¼
c) MPEG-2 AAC SSR å¯ååæ ·çè§æ ¼(Scaleable Sample Rate)
d) MPEG-4 AAC LC ä½å¤æ度è§æ ¼(Low Complexity)ï¼ç°å¨çææºæ¯è¾å¸¸è§çMP4æ件ä¸çé³é¢é¨ä»½å°±å
æ¬äºè¯¥è§æ ¼é³é¢æ件
e) MPEG-4 AAC Main 主è§æ ¼
f) MPEG-4 AAC SSR å¯ååæ ·çè§æ ¼(Scaleable Sample Rate)
g) MPEG-4 AAC LTP é¿æ¶æé¢æµè§æ ¼(Long Term Predicition)
h) MPEG-4 AAC LD ä½å»¶è¿è§æ ¼(Low Delay)
i) MPEG-4 AAC HE é«æçè§æ ¼(High Efficiency)
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