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Ç¥ÁعøÈ£ TTAE.IF-RFC4749 ±¸Ç¥ÁعøÈ£
Á¦°³Á¤ÀÏ 2007-12-26 ÃÑÆäÀÌÁö 21
ÇѱÛÇ¥Áظí G729.1 ¿Àµð¿À ÄÚµ¦À» À§ÇÑ RTP payload Æ÷¸Ë
¿µ¹®Ç¥Áظí RTP Payload Format for the G.729.1 Audio Codec
Çѱ۳»¿ë¿ä¾à º» Ç¥ÁØÀº ITU-TÀÇ ±¤´ë¿ª ÄÚµ¦ Ç¥ÁØÀÎ G.729.1 ÄÚµ¦ÀÇ ÀÎÄÚµùµÈ ¿Àµð¿À ½ÅÈ£¸¦ RTP
ÆäÀ̷ε忡 ÆÐŶȭ Çϱâ À§ÇÑ ÆäÀ̷εå Çü½ÄÀ» Á¦°øÇÑ´Ù. ITU-T G.729.1 ±¤´ë¿ª ÄÚµ¦Àº
8kbps¿¡¼­ 32kbps±îÁö 12°³ °èÃþÀÇ º¯È­°¡ °¡´ÉÇÑ °¡º¯´ë¿ª ÄÚµ¦ÀÇ Æ¯Â¡À» °¡Áö°í ÀÖ
´Ù. ù ¹ø° °èÃþÀÎ 8kbps´Â ITU-T G.729/G.729A¿Í ȣȯ °¡´ÉÇÏ´Ù. 12kbpsÀÇ Çù´ë¿ª
°èÃþÀÌ Á¸ÀçÇÏ°í, 14kbps¿¡¼­ 32kbps±îÁö 2kbps ´ÜÀ§·Î ±¤´ë¿ª °èÃþÀ» ÀÌ·ç°í ÀÖ´Ù. ¶Ç
ÇÑ ÄÚµ¦Àº 20ms ÇÁ·¹ÀÓÀ¸·Î µ¿ÀÛÇϸç, ±âº» »ùÇøµ ´ÜÀ§´Â 16kHzÀÌ´Ù. ¸ðµç ºñÆ®À²¿¡¼­
8kHzÀÇ ÀÔÃâ·Âµµ Áö¿øÇÑ´Ù. º» Ç¥ÁØ¿¡¼­´Â ÀÌ·¯ÇÑ ITU-T G.729.1 ÄÚµ¦ÀÇ °¡º¯´ë¿ª Ư¼º
À» RTP ÆäÀ̷ε忡 Àû¿ëÇϱâ À§ÇÑ ÆäÀ̷εå Çü½ÄÀ» Á¦°øÇÑ´Ù.
¿µ¹®³»¿ë¿ä¾à This standard specifies the payload format for packetization of ITU-T G.729.1
encoded audio signals into the Real-time Transport Protocol (RTP). The G.729.1 coder
produces an embedded bitstream structured in 12 layers corresponding to 12 available
bit rates between 8 and 32 kbps. The first layer, at 8 kbps, is called the core layer and
is bitstream compatible with the ITU-T G.729/G.729A coder. At 12 kbps, a second
layer improves the narrowband quality. Upper layers provide wideband audio (50-7000
Hz) between 14 and 32 kbps, with a 2 kbps granularity allowing graceful quality
improvements. The codec operates on 20-ms frames, and the default sampling rate is
16 kHz. Input and output at 8 kHz are also supported, at all bit rates. This standard
provides the payload format of RTP for the scalable and wideband G.729.1.
±¹Á¦Ç¥ÁØ IETF RFC 4749
°ü·ÃÆÄÀÏ TTAE.IF-RFC4749.pdf TTAE.IF-RFC4749.pdf            

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