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MPEG-2 AAC(Advanced Audio Coding, ISO/IEC 13818-7) Æ÷¸ËÀº MPEG Layer III(MP3)¿Í´Â ´Þ¸® ÇÁ·¹ÀÓ ´ÜÀ§·Î µ¥ÀÌÅ͸¦ ÀúÀåÇÏ ¸ç, ±×·Î ÀÎÇØ ÃÖ´ë 30%±îÁö ¿ë·®ÀÌ ÁÙ¾îµé°í, Çâ»óµÈ À½ÁúÀ» Á¦°øÇÕ´Ï´Ù. MPEG-2 AAC LC´Â µðÄÚ´õÀÇ ÇÁ·Î¼¼¼ ÆÄ¿ö ¹× ¸Þ¸ð¸®ÀÇ »ç¿ë·®ÀÌ Main Profile°ú ºñ±³Çؼ ÀÛ´Ù´Â °ÍÀÌ Æ¯Â¡ÀÔ´Ï´Ù. Main Profile¿¡¼ »ç¿ëµÇÁö ¾Ê´Â Gain Control Tool À̿ܿ¡ µµ Prediction ToolÀÌ »ç¿ëµÇÁö ¾ÊÀ¸¸ç TNS Orderµµ Á¦ÇÑÀÌ ÀÖ½À´Ï´Ù. MPEG-4 AAC(ISO/IEC 14496-3 AAC) LC´Â ISO/IEC 13818-7¿¡ Á¤ÀÇµÈ MPEG-2 AAC LC Profile°ú ¸Å¿ì À¯»çÇÕ´Ï´Ù. ±×·¯³ª, PNS ToolÀÌ »õ·Ó°Ô Ãß°¡µÇ¾ú½À´Ï´Ù. MPEG-4 AAC bitstream syntax´Â ISO/IEC 13818-7¿¡ Á¤ÀÇµÈ Syntax¿Í ȣȯ¼ºÀÌ ÀÖ½À´Ï´Ù. MPEG-4 AAC LC bitstreamÀ» µðÄÚµåÇÒ ¼ö ÀÖ´Â Decoder´Â MPEG-2 AAC Raw Data StreamÀ» DecodeÇÒ ¼ö ÀÖ½À´Ï´Ù. ÇÏÁö¸¸, MPEG-2 AAC Decoder°¡ MPEG-4 AAC BitstreamÀ» ParsingÇÒ ¼ö ÀÖ´Ù ÇÒ Áö¶óµµ PNS°¡ »ç¿ëµÉ ¼ö Àֱ⠶§¹®¿¡ À߸øµÈ °ªÀ» DecodingÇÒ ¼öµµ ÀÖ½À´Ï´Ù. |
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IP-TV, Wibro µîÀÇ ¸ÖƼ¹Ìµð¾î ȯ°æÀ» ÅëÇØ¼ ÃÖÀûÀÇ »óÅ·ΠÀü¼ÛÇÒ ¼ö ÀÖµµ·Ï MPEG-4 AAC ºñÆ®½ºÆ®¸²À» »ý¼ºÇÒ ¼ö ÀÖ´Â MPEG-2/MPEG-4 AAC Encoding ModuleÀ» Á¦°øÇÕ´Ï´Ù. ¶ÇÇÑ MS, TNS, PNS µî ¾ÐÃàÀ» À§ÇÑ °¢Á¾ ÅøÀ» ¿Ïº®ÇÏ¸ç ±¸ÇöÇÏ¸é¼ ½Ç ½Ã°£ ¾ÐÃà ±â¼úÀ» ±¸ÇöÇÏ¸é¼ ¿ø·¡ MPEG-4 AACÀÇ À½ÁúÀ» À¯ÁöÇÒ ¼ö ÀÖ½À´Ï´Ù. |
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MPEG-4 AAC Decoder´Â PNS, TNS µîÀÇ ¸ðµç ToolµéÀ» Ç¥Áذú ¿Ïº®ÇÏ°Ô È£È¯µÇµµ·Ï º¹È£È¸¦ ÇÕ´Ï´Ù. ¶ÇÇÑ, °íÁ¤ ¼Ò¼öÁ¡ Çü Å·Π±¸ÇöÇÏ¸é¼ º¹Àâµµ¸¦ °³¼±ÇÏ¿©, ¸ð¹ÙÀÏ ±â±â µîÀÇ Low-power½Ã½ºÅÛ¿¡¼µµ °íÀ½Áú ¼ºñ½º¸¦ °¡´ÉÇϵµ·Ï Áö¿øÇÕ´Ï´Ù. |
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Special Features [Encoding] |
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¤ý¾ÐÃàÀ» À§ÇÑ °¢Á¾ Tool (MS, TNS, PNS, SBR) ¿Ïº® Áö¿ø ¤ý½Ç½Ã°£ Encoding ±¸Çö ¤ý°íÀ½Áú ±¸Çö : CD±Þ ¾ÐÃà - ÀÚü °³¹ßµÈ Psychoacoustic Model - ÃÖÀûÈµÈ bitrate-distortion Control |
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Special Features [Decoding] |
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¤ý´Ù¾çÇÑ ÀÓº£µðµå ȯ°æ Áö¿ø - TI, ARM, EQUATOR, x86 Áö¿ø - °íÁ¤ ¼Ò¼öÁ¡ Decoder ¿Ïº® ±¸Çö ¤ý¾ÐÃàÀ» À§ÇÑ °¢Á¾ Tool (MS, TNS, IS, PNS) ¿Ïº® Áö¿ø ¤ýMPEG-2/MPEG-4 Compliant AAC Decoding Module |
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