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ÎÒдµÄÖÐÓ¢ÎÄÕªÒª¶ÔÕÕÈçÏ£¬¸Ð¾õ²»ºÃ£¬Çó°ïÖú¡£ ¿¼Âǵ½Ç¶Èëʽϵͳ¹¦ºÄµÄÏÞÖÆºÍÎÞÏßÐŵÀµÄʱ±äÌØµã£¬±¾ÎÄÌá³öÒ»ÖÖ²ÉÓÃÊÓÆµÑ¹Ëõ¼¼ÊõºÍÀ¶ÑÀ´«Êä¼¼ÊõµÄʵʱÊÓÆµ´«Êä·½°¸¡£¸Ãϵͳ²Å°¢Ó»ùÓÚÖÊÁ¿¿ØÖÆ·þÎñ»úÖÆµÄÀ¶ÑÀ·Ö×éÀàÐÍ£¬²¢Í¨¹ýͨÐÅÐÅÓÃÏûºÄ»úÖÆÀ´Ö§³ÖʵʱÊÓÆµ·þÎñ¡£ÏêϸµÄ²âÊÔ½á¹û±íÃ÷£¬±¾ÏµÍ³¿ÉÒÔÖ»ÊÇÓÅÖÊʵʱÊÓÆµ´«Ê䡣ʵÑéͬʱ±íÃ÷£¬Õë¶Ô²»Í¬µÄÐÅÔë±È£¨SNR£©£¬²ÉÓúÏÊʵÄACL·Ö×éÀàÐÍ£¬¶ø²»ÊÇ×î´ó·Ö×éÀàÐÍ£¬¿ÉÒÔ»ñµÃ×î´óµÄ´«ÊäËÙ¶È¡£±¾·½°¸ÓÉÓÚ¾ßÓнϺõĿÉÒÆÖ²ÐԺͽ¡×³ÐÔ£¬¿ÉÒÔÈÝÒ×ÔÚÒÆ¶¯Ó¦ÓÃÖÐʵÏÖ¡£ Considering the limit of battery lifetime in embedded system and character of timing varying fading wireless channel and, a framework for real video transmission over Bluetooth channels adopting video compression technology MPEG4 is proposed in the paper. The system adopts Quality of Service mechanisms for Bluetooth packet type, and utilizes traffic credits to support for real-time video services. A detailed measured results show that the system can support real-time large-size video transmission with good quality. And more, it suggests that a best appropriate ACL packets type, rather than the maximum payload packet, should be select according to SNR to achieve a maximal speed of transmit. Due to good transportability and robustness, it can be realized easily for mobile applications. |
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