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ÇѱÛÇ¥Áظí 64 kbit/s ÀÌÇÏ 7kHz ¿Àµð¿À ºÎȣȭ
¿µ¹®Ç¥Áظí 7kHz audio-coding within 64 kbit/s
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ÀÌ ºÎȣȭ/º¹È£È­ ½Ã½ºÅÛÀº ¼­ºê´ë¿ª ÀûÀÀ Â÷ºÐ ÆÞ½º ºÎÈ£ º¯Á¶(SBADPCM) ¹æ½ÄÀ» ÀÌ¿ëÇÏ¿© ÀÔ·Â ½ÅÈ£¸¦ 64 kbit/s ÀÌÇÏ·Î ¾ÐÃàÇÑ´Ù. µû¶ó¼­ ÀÌ ½Ã½ºÅÛÀ» 64
kbit/s ¿Àµð¿À(7kHz) ºÎȣȭ±â/º¹È£È­±â ¶ó°í ĪÇÑ´Ù. ÀÌ ½Ã½ºÅÛÀº 7kHz ¿Àµð¿À ºÎȣȭ¿¡ »ç¿ëµÇ¸ç ºñÆ®À²¿¡ µû¶ó¼­ ¼¼ °¡Áö ¸ðµå, 64, 56 ±×¸®°í 48 kbit/s ¸ðµå¸¦ Á¦°øÇÑ´Ù. ÈÄÀÚÀÇ µÎ ¸ðµå´Â ÇÏÀ§ ¼­ºê´ë¿ªÀÇ ºñÆ®¿¡ µû¶ó 64 kbit/s ³»¿¡¼­ Á¦°øµÉ ¼ö ÀÖ´Â °¢°¢ 8°ú 16 kbit/sÀÇ º¸Á¶ µ¥ÀÌÅÍ Ã¤³ÎÀ» °®´Â´Ù. ³×Æ®¿öÅ· Ãø¸é°ú ½ÃÇè ÀýÂ÷´Â º» Ç¥ÁØÀÇ ºÎ·Ï ¥°°ú ¥±¿¡ °¢°¢ ½Ç·ÁÀÖÀ¸¸ç, ¿¬¼ÓÀûÀ¸·Î ¿¬°áµÈ G.722 ºÎȣȭ/º¹È£È­±âÀÇ ½ÅÈ£ ´ë Àüü¿Ö°î ºñ¿¡ ´ëÇÑ ³»¿ëÀº ºÎ·Ï A¿¡ ½Ç·ÁÀÖ´Ù.
¿µ¹®³»¿ë¿ä¾à This Recommendation describes the characteristics of an audio (50 to 7 000 Hz) coding system which may be used for a variety of higher quality speech applications. The coding system uses sub-band adaptive differential pulse code modulation (SB-ADPCM)within a bit rate of 64 kbit/s. The system is henceforth referred to as 64 kbit/s (7 kHz) audio coding. In the SB-ADPCM technique used, the frequency band is split into two sub-bands (higher and lower) and the signals in each sub-band are encoded using ADPCM. The system has three basic modes of operation corresponding to the bit rates used for 7 kHz audio coding: 64, 56 and 48 kbit/s. The latter two modes allow an auxiliary data channel of 8 and 16 kbit/s respectively to be provided within the 64 kbit/s by making use of bits from the lower subband. Networking aspects and test sequences are addressed in Appendices I and II respectively to this Recommendation. Also, Annex A describes testing signal-to-total distortion for 7kHz audio-codecs at 64kbit/s Recommendation G.722 connected back-to back.
±¹Á¦Ç¥ÁØ ITU-T G.722
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