数字电视基础培训

1,数字电视基础培训 Part 1,有线所 2005-09,Confidential,2,内容,数字与模拟 图像压缩 数字调制基础 数字电视标准 数字电视传输体系 数字电视服务体系 小结 参考文献,Confidential,3,数字与模拟,Confidential,4,图像压缩,为什么要进行压缩编码 数字复合NTSC : 143Mbps 数字复合PAL : 177Mbps 数字分量ITU-R 601 : 270Mbps,Confidential,5,图像压缩,Confidential,6,图像压缩,压缩标准： JPEG： Joint Picture Experts Group Motion-JPEG MPEG：Moving Picture Experts Group MPEG-1 MPEG-2 MPEG-3 MPEG-4,Confidential,9,图像压缩,Confidential,10,图像压缩,1,2,3,4,5,6,7,8,9,10,11,12,13,I 1,P 4,B 2,B 3,P 7,B 5,B 6,P 10,B 8,B 9,I 13,B 11,B 12,1,2,3,4,5,6,7,8,9,10,11,12,13,Confidential,11,图像压缩,Confidential,12,图像压缩,Confidential,13,图像压缩,Confidential,14,数字调制基础,信源编码的目的是提高信源的效率 信道编码的目的是增加传输的可靠性 透明，对所传信息的内容没有任何限定 具有与信道相适应的频谱特征 效率高 包含同步信息 有纠错能力 差错扩散度低,Confidential,15,数字调制基础,0000,0001,0010,0011,0100,0101,0110,0111,1000,1001,1010,1011,1100,1101,1110,1111,Confidential,16,数字调制基础,Confidential,17,数字调制基础,0000-0011-1001-1111-1100-0111-0101-1000-0110-0010-0100,0000,0011,1001,1111,1100,0111,0101,1000,0110,0010,0100,00000011100111111100011101011000011000100100,需要VLC等对数据的优化,Confidential,18,数字电视标准,AV信源,AV 编码压缩,码流复用,信道编码调制,信道解调解码,AV解码,AV显示,Confidential,19,数字电视标准,欧洲：DVB 美国：ATSC 日本：ISDB-T,Confidential,20,数字电视传输体系,有线信道 数字有线电视 无线信道 数字卫星电视 数字地面电视 数字手持电视,Confidential,21,数字电视传输体系数字有线电视,16QAM, 32QAM,64QAM,128QAM,256QAM,Confidential,22,数字电视传输体系数字卫星电视,Confidential,23,数字电视传输体系数字地面电视,调制方式： COFDM Coded Orthogonal Frequency Division Multiplex 2K：1705 8K：6817,Confidential,24,数字电视传输体系数字地面电视,Confidential,25,数字电视传输体系数字手持电视,Based on DVB-T, backwards fully compatible Gives additional features to support Handheld portable and mobile reception battery saving mobility with high data rates, single antenna reception, SFN networks impulse noise tolerance increased general robustness support for seamless handover The above have been achieved by adding options Time-slicing for power saving MPE-FEC for additional robustness and mobility 4k mode for mobility and network design flexibility plus additional minor changes, e.g., in signalling DVB-H is meant for IP-based services via MPE insertion DVB-H can share DVB-T multiplex with MPEG2 services Portable/indoor coverage should be built to the network for fully exploit the DVB-H possibilities businesswise,Confidential,26,数字电视传输体系数字手持电视,DVB-H,Power consumption is key !,H,Confidential,27,数字电视传输体系数字手持电视,Based on DVB-T, can share multiplex with DVB-T services IP-based solution, MPE used over DVB-T New 1: Time Slicing for power saving New 2: MPE-FEC for mobile performance and tolerance to impulse noise, (reuses memory of time slicing, has effectively a virtual time interleaver) New 3: features to DVB-T PHY Optional 4K mode and 4K symbol interleaver for mobility in large and medium sized SFNs Optional in-depth interleaver for 2K and 4K Additional signalling in TPS Mandatory use of cell-ID 5 MHz channels for non-broadcasting bands,Confidential,28,数字电视传输体系数字手持电视,MUX,8k,4k,2k,DVB-H TPS,DVB-T Modulator,TS,RF,RF,Transmitter,8k,4k,2k,DVB-H TPS,DVB-T Demodulator,TS,Receiver,Channel,Confidential,29,数字电视传输体系数字手持电视,Time Sliced and non-Time Sliced services in common multiplex Only receiver switched off, transmitter on all the time Support for Time Slicing not mandatory to receive Time Sliced service Even 90% power saving for the front-end can easily be achieved. Uninterrupted service reception with single receiver hand-over.,e.g. MPEG2,Confidential,30,数字电视传输体系数字手持电视,Confidential,31,数字电视服务体系,Confidential,32,数字电视服务体系,Confidential,33,数字电视服务体系,Confidential,34,数字电视服务体系,Confidential,35,数字电视服务体系,Confidential,36,数字电视服务体系,Confidential,37,数字电视服务体系,Confidential,38,数字电视服务体系,数据广播,Confidential,39,数字电视服务体系,应 用,MPEG-2 TS 流,数据管道,数据流,PES,MPEG-2 私有数据段,DSM-CC Section,DSM-CC 数据轮播,DSM-CC 对象轮播,对象轮播,多协议 封装,数