Method for searching electric program menu in digital television system
A technology of electronic program menu and digital TV system, applied in electrical components, image communication, selective content distribution, etc., can solve the problems of long search time and low search efficiency, reduce search time, improve search efficiency, and speed up Effect
Inactive Publication Date: 2012-07-18
RUGAO CHANGJIANG SCI & TECHCAL IND CO LTD
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[0027] From the above search process, it can be seen that the prior art uses serial search, that is, PAT->PMT->NIT->BAT->SDT->EIT In order to search sequentially, what table is needed is what table is searched. If the table sent by the multiplex stream in this cycle is not the table currently needed, the sent table is discarded and the currently needed table is continued to be searched; when it is necessary to search the sent table For that kind of table, because it has been discarded in this cycle, it needs to be searched again from the next cycle. In this way, it often takes several cycles to search all kinds of tables. It can be seen that this serial search method takes a long time to search. , The search efficiency is low, it is very important to find a fast and efficient EPG search method
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[0045] The present invention is designed for tables without strict processing sequence requirements, and its basic idea is: fast search of EPG in parallel mode. Figure 5 It is a schematic diagram of a parallel method for searching EPG in the present invention, such as Figure 5 As shown, filters for various tables are set at the same time, and once a table is transmitted, the table is filtered out. In the actual search process, the PAT is the table that must be searched first, so a filter is set to filter out the PAT, and when the PAT is found, the PAT is parsed to obtain the PID of each PMT and the PID of the NIT. Since there is no strict transmission order for other tables, multiple filters can be turned on at the same time to filter PMT, NIT, BAT, SDT and EIT respectively, so that the function of filtering whatever table comes in can be realized.
[0046] Here, the filter is a logical concept, which can be implemented by hardware or simulated by software in specific imple...
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The present invention discloses a method for searching an electronic program guide (EPG) in a digital television system, which includes two steps. Firstly, a program association table (PAT) is sought out from a multiplexed stream, and the program association table (PAT) is parsed in order to obtain the packet identifier (PID) of the program mapping table (PMT) of each service and the packet identifier (PID) of the network information table (NIT) of each service; secondly, according to the parsing result, all forms transmitted by the multiplexed stream are searched and filtered out. Without increasing the hardware cost, the present invention can accelerate the searching of the electronic program guide (EPG) and increase the searching efficiency.
Description
technical field [0001] The invention relates to an electronic program menu (EPG, Electronic Program Guide) search technology, in particular to a method for searching an EPG in a digital television system. Background technique [0002] Digitization is a worldwide technological revolution and an inevitable trend in the development of broadcasting and television. In developed countries and regions, digital TV has now entered the stage of large-scale commercial application, especially in the past two years, digital TV has begun large-scale commercial use in many cities, users only need to connect a digital TV set-top box to the TV, and it can complete EPG search, channel selection, decoding, output and other functions of digital TV. [0003] The network layer transmits component information such as video, audio, and data in various services to the set-top box through various channels or transponders through broadcasting. The transmission model is as follows: figure 1 As shown,...
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IPC IPC(8): H04N21/434H04N21/435
Inventor 刘成刚
Owner RUGAO CHANGJIANG SCI & TECHCAL IND CO LTD