數(shù)字廣告電視傳媒標準管理及系統(tǒng)簡介(編輯修改稿)
2025-01-29 23:25 本頁面
【文章內容簡介】 。reflection– Largebandwidth– QPSKwithStrongcoding? DVBC– Lownoisewithcontrollednoreflections– Smallbandwidth– 16256QAMwithWeakcoding? DVBT– NoisysignalwithreflectionsStrongcoding– Smallbandwidth– COFDMwithStrongcodingConfidential 23ChannelEncodingModulationRandomizationOuterCoderOuterInterleaverInnerCoderInnerInterleaverModulatorRS(204,188)RS(204,188)RS(204,188)RandomizationOuterCoderOuterInterleaverInnerCoderInnerInterleaverDemodulatorTSTSRFRFQPSKQAMOFDMConvolutionConvolutionPunctureConvolutionPunctureConvolutionConvolutionConvolutionSatelliteCableTerrestrialConfidential 24DSTSTBSystemBlockDigital Tuner QPSKDemod/FECHDD IFHDDCPUGraphics ControllersAudioDACDecryptCPCANTSC/PALEncoderVideo DACR/G/BY/U/V (HDTV)AudioSmart card readerSmart CardmodemDRAMFlashADCMPEGIIDemux Decode,A/V DecoderCVBSYCLNBConfidential 25DCTSTBSystemBlockDigital TunerOOB QPSK TunerRF ? Baseband Preprocessing Main processing Post processing Output / Input64/256QAMDemod/FECNTSC DecodeQPSKDemodVBI Data DecodeMPEG2Demux Decode,A/V decoderVideoAudioDecryptCPCAMultimediaProcessorGraphic processorNTSC EncodeCPUUser Interfacesettop functions applicationsCondition Access (POD)Composite videoComponentSvideoStereo AudioAC3 RCAL/RRCAADCDRAMFlash1394CableHAViQPSKModConfidential 26DTTSTBSystemBlockDigital Tuner OFDM/VSBDemod/FECHDD IFHDDCPUGraphics ControllersAudioDACDecryptCPCANTSC/PALEncoderVideo DACR/G/BY/U/V (HDTV)AudioSmart card readerSmart CardmodemDRAMFlashADCMPEGIIDemux Decode,A/V DecoderCVBSYCRFConfidential 27DifferencewithDVDPlayer? Conditional Access (CA)– Encryption,Subscription,PayPerView,…? Electronic Program Guide (EPG)– Sortingbytime,bychannel,
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