南京信息工程大学学报
南京信息工程大學學報
남경신식공정대학학보
JOURNAL OF NANJING UNIVERSITY OF INFORMATION SCIENCE & TECHNOLOGY
2014年
1期
41-46
,共6页
气象预警%预警信息%码率控制%数字多媒体广播( DMB)%传输流
氣象預警%預警信息%碼率控製%數字多媒體廣播( DMB)%傳輸流
기상예경%예경신식%마솔공제%수자다매체엄파( DMB)%전수류
meteorological early warning%early warning information%bit-rate control%digital multimedia broadcast-ing%transport stream
为解决预警信息音频广播的单一性，通过对数字多媒体广播（ DMB）的标准研究，设计了基于码率控制的DMB预警信息预处理系统．该系统采用MPEG-4 HE AAC和H．264/AVC编码算法对预警音视频信息分别进行信源编码，实现将编码后信息合成为TS码流；采用RS和卷积交织的信道编码方法实现 TS码流的纠错控制，提高传输可靠性．针对传输码率不稳定、音视频传输容量和速率不匹配的技术难点，提出基于码率控制的音视频匹配控制传输方法，通过空包插入法实现对编码输出数据码率的智能控制，达到音视频预警信息的稳定实时输出．该预处理系统目前已通过验证，可显著提高预警信息传输的可靠性、稳定性和实时性．
為解決預警信息音頻廣播的單一性，通過對數字多媒體廣播（ DMB）的標準研究，設計瞭基于碼率控製的DMB預警信息預處理繫統．該繫統採用MPEG-4 HE AAC和H．264/AVC編碼算法對預警音視頻信息分彆進行信源編碼，實現將編碼後信息閤成為TS碼流；採用RS和捲積交織的信道編碼方法實現 TS碼流的糾錯控製，提高傳輸可靠性．針對傳輸碼率不穩定、音視頻傳輸容量和速率不匹配的技術難點，提齣基于碼率控製的音視頻匹配控製傳輸方法，通過空包插入法實現對編碼輸齣數據碼率的智能控製，達到音視頻預警信息的穩定實時輸齣．該預處理繫統目前已通過驗證，可顯著提高預警信息傳輸的可靠性、穩定性和實時性．
위해결예경신식음빈엄파적단일성，통과대수자다매체엄파（ DMB）적표준연구，설계료기우마솔공제적DMB예경신식예처리계통．해계통채용MPEG-4 HE AAC화H．264/AVC편마산법대예경음시빈신식분별진행신원편마，실현장편마후신식합성위TS마류；채용RS화권적교직적신도편마방법실현 TS마류적규착공제，제고전수가고성．침대전수마솔불은정、음시빈전수용량화속솔불필배적기술난점，제출기우마솔공제적음시빈필배공제전수방법，통과공포삽입법실현대편마수출수거마솔적지능공제，체도음시빈예경신식적은정실시수출．해예처리계통목전이통과험증，가현저제고예경신식전수적가고성、은정성화실시성．
To solve the singleness of audio broadcasting of the early warning information,a pre-processing system of DMB( Digital Multimedia Broadcasting) early warning information based on rate control was designed according to the study of DMB standards. The audio and video of the warning information were encoded by the algorithm of MPEG-4 HE AAC and H.264/AVC and synthesized into transport streams in this system firstly.Then in order to im-prove communication reliability,the transport streams were error corrected by Reed Solomon encoding and convolu-tional interleaving.Meanwhile,to solve the problem of the transmission instability rate and ensure the value of the rate to be constant,a transportation control method of audio and video matching control based on rate control is pro-posed.Through this method,the intelligent controlling of the output rate is realized by adopting inserting null packa-ges.The whole system is validated by experiments and outperforms former DMB preprocessing system in both relia-bility and stability.
