数字电视基础培训ppt课件

1、数字电视根底培训 Part 1有线所2019-09Confidential2内容n数字与模拟n图像紧缩n数字调制根底n数字电视规范n数字电视传输体系n数字电视效力体系n小结n参考文献Confidential3数字与模拟AnalogDigital Confidential4图像紧缩n为什么要进展紧缩编码为什么要进展紧缩编码n数字复合数字复合NTSC : 143Mbps n数字复合数字复合PAL : 177Mbpsn数字分量数字分量ITU-R 601 : 270MbpsConfidential5图像紧缩Confidential6图像紧缩紧缩规范：紧缩规范：JPEG： Joint Picture E

2、xperts Group Motion-JPEGMPEG：Moving Picture Experts Group MPEG-1 MPEG-2 MPEG-3 MPEG-4Confidential9图像紧缩Video InCoded framesQuantizeVariable LengthCoderDCTMUXBUFFERrate controllosslessAddPass /SubtractAnchor frame storeMotion Estimationpredicetdframe storeGOP ControlMotion Vectors422 to420inverseDCTCo

3、nfidential10图像紧缩12345678910111213I1P4B2B3P7B5B6P10 B8B9I13B11B1212345678910111213Confidential11图像紧缩PES packet payloadPES packet headerAudio or Video Elementary Stream TS PacketTS Packet HeaderConfidential12图像紧缩Elementary streamsVideoAudioMPEG AudioEncoderMPEG VideoEncoderInternalMultiplexerBasic Enc

4、oder FunctionSPTS -Single program MPEGTransport streamsPSIMPTS -Multiple program Transport streamRemuxPSI/SIManagerOutput AdapterBasic Multiplexer FunctionSPTS -SPTS -SPTS -SPTS -DATA -Confidential13图像紧缩0Channel ComplexityRelative Activity 电影新闻节目体育节目20%40%60%80%100%电影新闻节目体育节目Confidential14数字调制根底n信源编

5、码的目的是提高信源的效率n信道编码的目的是添加传输的可靠性n透明，对所传信息的内容没有任何限定n具有与信道相顺应的频谱特征n效率高n包含同步信息n有纠错才干n过失分散度低Confidential15数字调制根底0000000100100011010001010110011110001001101010111100110111101111Confidential16数字调制根底Confidential17数字调制根底0000-0011-1001-1111-1100-0111-0101-1000-0110-0010-01000000001110011111110001110101100001100

6、010010000000011100111111100011101011000011000100100需求需求VLC等对数据的优化等对数据的优化Confidential18数字电视规范AV信源AV编码紧缩码流复用信道编码调制信道解调解码AV解码AV显示Confidential19数字电视规范标准体系 ATSC DVB 视频编码 MPEG-2 MPEG-2 音频编码 Dolby AC-3 MPEG-2 /Dolby AC-3 地面广播标准/调制方式 8-VSB DVB-T COFDM 有线广播标准/调制方式 无 * DVB-C n-QAM 卫星广播标准/调制方式 QPSK 可选 8PSK、16Q

7、AM DVB-S QPSK 欧洲：DVB美国：ATSC日本：ISDB-TConfidential20数字电视传输体系n有线信道n数字有线电视n无线信道n数字卫星电视n数字地面电视n数字手持电视Confidential21数字电视传输体系数字有线电视16QAM, 32QAM,64QAM,128QAM,256QAMConfidential22数字电视传输体系数字卫星电视Confidential23数字电视传输体系数字地面电视调制方式： COFDM Coded Orthogonal Frequency Division Multiplex2K：17058K：6817Confidential24数字电

8、视传输体系数字地面电视Confidential25数字电视传输体系数字手持电视nBased on DVB-T, backwards fully compatiblenGives additional features to support Handheld portable and mobile receptionnbattery saving nmobility with high data rates, single antenna reception, SFN networksnimpulse noise tolerancenincreased general robustnessnsu

9、pport for seamless handovernThe above have been achieved by adding optionsnTime-slicing for power savingnMPE-FEC for additional robustness and mobilityn4k mode for mobility and network design flexibilitynplus additional minor changes, e.g., in signallingnDVB-H is meant for IP-based services via MPE

10、insertionnDVB-H can share DVB-T multiplex with MPEG2 servicesnPortable/indoor coverage should be built to the network for fully exploit the DVB-H possibilities businesswiseConfidential26数字电视传输体系数字手持电视DVB-TUMTSDVB-TtransmitterBroadcastContentProviderMuxDTVbroadcast network operatorISPCorenetworkUMTSb

11、ase stationmobile operatorMobileterminalDVB-UMTSIMTIBOIBIIIMOCo-operation PlatformDVB-HPowerconsumptionis key !HConfidential27数字电视传输体系数字手持电视Based on DVB-T, can share multiplex with DVB-T servicesIP-based solution, MPE used over DVB-TNew 1: Time Slicing for power savingNew 2: MPE-FEC for mobile perfo

12、rmance and tolerance to impulse noise, (reuses memory of time slicing, has effectively a virtual time interleaver)New 3: features to DVB-T PHYOptional 4K mode and 4K symbol interleaver for mobility in large and medium sized SFNsOptional in-depth interleaver for 2K and 4KAdditional signalling in TPSM

13、andatory use of cell-ID5 MHz channels for non-broadcasting bandsConfidential28数字电视传输体系数字手持电视MUXMPEG-2 TV ServiceMPEG-2 TV ServiceMPEG-2 TV ServiceMPEG-2 TV ServiceMPEMPE-FECTimeSlicingDVB-HIP- EncapsulatorIP8k 4k 2kDVB-H TPSDVB-T ModulatorTSRFRFTransmitter8k 4k 2k DVB-H TPSDVB-T DemodulatorTSMPEMPE-

14、FECTimeSlicingDVB-HIP- DecapsulatorIPReceiverNew to DVB-HExistingChannelConfidential29数字电视传输体系数字手持电视nTime Sliced and non-Time Sliced services in common multiplexnOnly receiver switched off, transmitter on all the timenSupport for Time Slicing not mandatory to receive Time Sliced servicenEven 90% pow

15、er saving for the front-end can easily be achieved.nUninterrupted service reception with single receiver hand-over.Service 1 (not Time Sliced)Service 2 (Time Sliced)Service 3 (Time Sliced)Service 4 (Time Sliced)TimeCapacity shareTS bitrateConfidential30数字电视传输体系数字手持电视eeeF1F2F3DVB-H IPE-Time Slicing-M

16、PE-FECDVB-T Tx-4k capable, if neededRepeater-Repeaters may be used.IP-backboneDense SFNFFT-size selected according the planning requirementsSome operators use 4k some 8kConfidential31数字电视效力体系Confidential32数字电视效力体系Confidential33数字电视效力体系Confidential34数字电视效力体系Confidential35数字电视效力体系CW ECM EMM CW 视频/音频/

17、数据 视频/音频/数据 （已加扰） 视频/音频/数据 （已解扰） 加扰 控制字生成 ECM 生成（加密） 用户管理系统（SMS） 用户授权系统（SAS） 传 输 系 统 解扰 智能卡 Confidential36数字电视效力体系OS, drivers, firmware, .Java Virtual MachineInteroperable ApplicationTrans-portProto-col(s)DVB specificAPIsSun JavaAPIsDAVICAPIsDataHAViAPIsApplicationManager(Navigator)InteroperableApplication(and libraries)System SoftwareConfidential37数字电视效力体系Content DeliveryContent CreationContent ReceptionConfidential38数字电视效力体系数据广播数据广播音视频内容音视频内容数据内容数据内容音视频处置单元音视频处置单元数据广播子系统数据广播子系统复复 用用 器器CA/SMS系统系统网络接口网络接口传输网络传输网络用户接纳端用户接纳端数字电视系统数字电视系统Confidential39数字电视效力体系应应