A Study On Digital TV Front Monitoring System

Based on the introduction of MPEG-2(Moving Picture Expert Group) transport stream and packet stream syntax, various kinds of useful digital TV data are separated from the standard MPEG-2 transport stream. With analysis of the PSI(Program Specification Information),including PAT(Program Association Table),PMT(Program Map Table) and CAT(Conditional Access Table),an effective method of parsing PSI is put forward. Through the specification of the DVB (Digital Video Broadcasting) SI (Specification Information), including NIT (Network Information Table), SDT (Service Descriptor Table) and BAT (Bouquet Association Table), the SI and various kinds of descriptors are parsed in the thesis.According to the above discussion about MPEG-2 transport stream and PSI/SI, This paper proposes a front monitoring system, strictly complying with MPEG-2 and DVB standards. To make the module easier to reuse, module design method is adopted. Urge the whole system depending on the receive data, receiving module get the data, and add the data into the channel, channel notify the main module. In the system, a filter is designed to parse and dispose the various digital video data, and a queue buffer is designed to play the program elementary stream. The program flux value and various statistics and the errors defined in ETSI (European Telecommunication Standard Institute) TR (Technical Report) 290 are recorded. Exception in transport stream can be alarmed. The event and message in the system running period can be recorded on a log that can be maintained.