數(shù)字電視基礎(chǔ)培訓(xùn)ppt課件

1、數(shù)字電視根底培訓(xùn) Part 1有線所2019-09Confidential2內(nèi)容n數(shù)字與模擬n圖像緊縮n數(shù)字調(diào)制根底n數(shù)字電視規(guī)范n數(shù)字電視傳輸體系n數(shù)字電視效力體系n小結(jié)n參考文獻(xiàn)Confidential3數(shù)字與模擬AnalogDigital Confidential4圖像緊縮n為什么要進(jìn)展緊縮編碼為什么要進(jìn)展緊縮編碼n數(shù)字復(fù)合數(shù)字復(fù)合NTSC : 143Mbps n數(shù)字復(fù)合數(shù)字復(fù)合PAL : 177Mbpsn數(shù)字分量數(shù)字分量ITU-R 601 : 270MbpsConfidential5圖像緊縮Confidential6圖像緊縮緊縮規(guī)范：緊縮規(guī)范：JPEG： Joint Picture E

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

3、nfidential10圖像緊縮12345678910111213I1P4B2B3P7B5B6P10 B8B9I13B11B1212345678910111213Confidential11圖像緊縮PES packet payloadPES packet headerAudio or Video Elementary Stream TS PacketTS Packet HeaderConfidential12圖像緊縮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圖像緊縮0Channel ComplexityRelative Activity 電影新聞節(jié)目體育節(jié)目20%40%60%80%100%電影新聞節(jié)目體育節(jié)目Confidential14數(shù)字調(diào)制根底n信源編

5、碼的目的是提高信源的效率n信道編碼的目的是添加傳輸?shù)目煽啃詎透明，對(duì)所傳信息的內(nèi)容沒(méi)有任何限定n具有與信道相順應(yīng)的頻譜特征n效率高n包含同步信息n有糾錯(cuò)才干n過(guò)失分散度低Confidential15數(shù)字調(diào)制根底0000000100100011010001010110011110001001101010111100110111101111Confidential16數(shù)字調(diào)制根底Confidential17數(shù)字調(diào)制根底0000-0011-1001-1111-1100-0111-0101-1000-0110-0010-01000000001110011111110001110101100001100

6、010010000000011100111111100011101011000011000100100需求需求VLC等對(duì)數(shù)據(jù)的優(yōu)化等對(duì)數(shù)據(jù)的優(yōu)化Confidential18數(shù)字電視規(guī)范AV信源AV編碼緊縮碼流復(fù)用信道編碼調(diào)制信道解調(diào)解碼AV解碼AV顯示Confidential19數(shù)字電視規(guī)范標(biāo)準(zhǔn)體系 ATSC DVB 視頻編碼 MPEG-2 MPEG-2 音頻編碼 Dolby AC-3 MPEG-2 /Dolby AC-3 地面廣播標(biāo)準(zhǔn)/調(diào)制方式 8-VSB DVB-T COFDM 有線廣播標(biāo)準(zhǔn)/調(diào)制方式 無(wú) * DVB-C n-QAM 衛(wèi)星廣播標(biāo)準(zhǔn)/調(diào)制方式 QPSK 可選 8PSK、16Q

7、AM DVB-S QPSK 歐洲：DVB美國(guó)：ATSC日本：ISDB-TConfidential20數(shù)字電視傳輸體系n有線信道n數(shù)字有線電視n無(wú)線信道n數(shù)字衛(wèi)星電視n數(shù)字地面電視n數(shù)字手持電視Confidential21數(shù)字電視傳輸體系數(shù)字有線電視16QAM, 32QAM,64QAM,128QAM,256QAMConfidential22數(shù)字電視傳輸體系數(shù)字衛(wèi)星電視Confidential23數(shù)字電視傳輸體系數(shù)字地面電視調(diào)制方式： COFDM Coded Orthogonal Frequency Division Multiplex2K：17058K：6817Confidential24數(shù)字電

8、視傳輸體系數(shù)字地面電視Confidential25數(shù)字電視傳輸體系數(shù)字手持電視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數(shù)字電視傳輸體系數(shù)字手持電視DVB-TUMTSDVB-TtransmitterBroadcastContentProviderMuxDTVbroadcast network operatorISPCorenetworkUMTSb

11、ase stationmobile operatorMobileterminalDVB-UMTSIMTIBOIBIIIMOCo-operation PlatformDVB-HPowerconsumptionis key !HConfidential27數(shù)字電視傳輸體系數(shù)字手持電視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數(shù)字電視傳輸體系數(shù)字手持電視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數(shù)字電視傳輸體系數(shù)字手持電視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數(shù)字電視傳輸體系數(shù)字手持電視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數(shù)字電視效力體系Confidential32數(shù)字電視效力體系Confidential33數(shù)字電視效力體系Confidential34數(shù)字電視效力體系Confidential35數(shù)字電視效力體系CW ECM EMM CW 視頻/音頻/

17、數(shù)據(jù) 視頻/音頻/數(shù)據(jù) （已加擾） 視頻/音頻/數(shù)據(jù) （已解擾） 加擾 控制字生成 ECM 生成（加密） 用戶管理系統(tǒng)（SMS） 用戶授權(quán)系統(tǒng)（SAS） 傳 輸 系 統(tǒng) 解擾 智能卡 Confidential36數(shù)字電視效力體系OS, drivers, firmware, .Java Virtual MachineInteroperable ApplicationTrans-portProto-col(s)DVB specificAPIsSun JavaAPIsDAVICAPIsDataHAViAPIsApplicationManager(Navigator)InteroperableApplication(and libraries)System SoftwareConfidential37數(shù)字電視效力體系Content DeliveryContent CreationContent ReceptionConfidential38數(shù)字電視效力體系數(shù)據(jù)廣播數(shù)據(jù)廣播音視頻內(nèi)容音視頻內(nèi)容數(shù)據(jù)內(nèi)容數(shù)據(jù)內(nèi)容音視頻處置單元音視頻處置單元數(shù)據(jù)廣播子系統(tǒng)數(shù)據(jù)廣播子系統(tǒng)復(fù)復(fù) 用用 器器CA/SMS系統(tǒng)系統(tǒng)網(wǎng)絡(luò)接口網(wǎng)絡(luò)接口傳輸網(wǎng)絡(luò)傳輸網(wǎng)絡(luò)用戶接納端用戶接納端數(shù)字電視系統(tǒng)數(shù)字電視系統(tǒng)Confidential39數(shù)字電視效力體系應(yīng)應(yīng)