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¿µ¹®Ç¥Áظí Frame-synchronous control and indication signals for audiovisual systems
Çѱ۳»¿ë¿ä¾à µðÁöÅÐ ½Ãû°¢ ¼­ºñ½º´Â H.221¿¡ Á¤ÀÇµÈ ÇÁ·¹ÀÓ ±¸Á¶¸¦ ÀÌ¿ëÇÏ¿© µðÁöÅÐ °æ·Î¸¦ ÅëÇØ °ü·Ã ½ÅÈ£¸¦ ÁßøÇÏ¿© Àü¼Û ½Ã½ºÅÛÀ» ÅëÇؼ­ Á¦°øµÈ´Ù. À½¼º,¿µ»ó,»ç¿ëÀÚ µ¥ÀÌÅÍ ¹× Àü¼Û Á¤º¸¿¡ Ãß°¡ÇÏ¿© ½Ã½ºÅÛÀÇ Á¤»ó µ¿ÀÛÀ» À§ÇÑ Á¤º¸¸¦ Æ÷ÇÔÇÑ´Ù. ÀÌ Ãß°¡ Á¤º¸´Â Á¦¾î ¹× Ç¥½Ã ½ÅÈ£¶ó°í ºÒ¸®¸ç, Á¦¾î¸¦ À§ÇÑ ¸î ºñÆ® Á¤º¸¿Í ½Ã½ºÅÛ ±â´É¿¡ ´ëÇؼ­ »ç¿ëÀÚ¿¡°Ô Ç¥½Ã ±â´ÉÀ» ¹Ý¿µÇÏ°í ÀÖ´Ù. ÀÌ ±Ç°í¾ÈÀº ¼ýÀÚ¿Í ¹®ÀÚ¸¦ Àü¼ÛÇϱâ À§ÇÑ ¼ö´Ü, °ü¸®¸¦ À§ÇÑ Á¦¾î Ç¥½Ã½ÅÈ£, MLP ä³ÎÀ» »ç¿ëÇÏÁö ¾Ê´Â °£´ÜÇÑ ´ÙÀÚ°£ ȸÀÇ, ä³Î ÁýÇÕ, ³×Æ®¿öÅ© ÁÖ¼ÒÀÇ Àü¼Û ¹æ¹ý¿¡ ´ëÇÑ ½Ãû°¢°ú °ü·ÃµÈ Á¦¾î Ç¥½Ã½ÅÈ£¸¦ ´Ù·ç°í ÀÖ´Ù.
¿µ¹®³»¿ë¿ä¾à Digital audiovisual services are provided by a transmission system in which the relevant signals are multiplexed onto a digital path using the frame structure defined in ITU-T Rec. H.221. In addition to the audio, video, user data and telematic information, these signals include information for the proper functioning of the system. The additional information has been named Control and Indication (C&I) to reflect the fact that while some bits are genuinely for "control", causing a state change somewhere else in the system, others provide for indications to the users as to the functioning of the system. This Recommendation concerns only those C&I which must be transmission frame synchronous, or otherwise requiring rapid response.
The Recommendation details the C&I related to video and audio; means of transmitting numbers and characters; C&I for maintenance purposes; for simple multipoint conferences not using protocol in the MLP channel; for channel aggregation; and for the transfer of network addresses. The codepoint tables also indicate the circumstances under which the various functions may be mandatory or optional.
This revised version of H.230 introduces a number of enhancements and clarifications to the previous version, primarily the description on the usage of H.239, H.241, H.264 and ISO/IEC 14496-3 in H.320 systems.
±¹Á¦Ç¥ÁØ ITU-T H.230
°ü·ÃÆÄÀÏ TTAE.IT-H230.zip TTAE.IT-H230.zip            
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Á¦Á¤ 1993-11-24 TTAS.IT-H230
°³Á¤ 2003-12-18 TTAS.IT-H230/R1
°³Á¤ 2007-06-22 TTAE.IT-H230

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