數(shù)字有線電視技術(shù)概覽(編輯修改稿)
2025-05-26 08:28 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 節(jié)目級(jí)復(fù)接 MPEG 復(fù)用 ? 系統(tǒng)級(jí)復(fù)接 MPTS Multiple program Transport stream Remux PSI/SI Manager Output Adapter Basic Multiplexer Function SPTS SPTS SPTS SPTS DATA PSI MPEG2 PSI Data Program Specific Information Table contents ? PAT Program Association Table Indicates the location (the PID values of the transport stream Packets) of the corresponding Program Map Table (PMT) for each service in the multiplex. ? CAT Conditional Access Table Provides the information of the Conditional Access system used in the multiplex。 the information is private and dependent on the CA system. ? PMT Program Map Table Identifies and indicates the locations of the streams that make up each service, and the location of the Program Block Reference fields for a service MPEG2 PSI Data Program Specific Information Table contents (cont) ? NIT Network Information Table The Network Information Table groups together services belonging to a particular Network provider. It contains all the tuning information that might be used during the setup of an IRD ? SDT Service Description Table The Service Description Table lists the names and other parameters associated with each service in a particular MPEG Multiplex Stream. ? EIT Event Information Table The Event Information Table is used to transmit information relating to all the events that occur or will occur in the MPEG Multiplex. The EIT contains information about the current transport, and optionally covers other transport streams that the IRD can receive MPEG2 PSI Data Program Specific Information Table contents (cont) ? TDT Time and Date Table The Time and Date Table is used to update the IRD’s internal clock ? BAT Bouquet Association Table The Bouquet Association Table provides a means of grouping services that might be used as one way an IRD presents the available services to the viewer. A particular service can belong to one or more bouquets ? RST Running Status Table The sections of the Running Status Table are used to rapidly update the running status of one or more events. The running Status are sent out only once, at the time the status of an event changes, unlike other SI tables which are normally repetitively transmitted 三、數(shù)字有線電視系統(tǒng) DVB Standard Overview DVB 標(biāo)準(zhǔn)家族 ? DVBS ?The digital satellite system for use in the frequency bands up to 11/1
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