Digital TV as digital transmission, multiple services can be mixed together through a transmission channel. Therefore, digital television has not a single television business, but to channel through the transmission of digital television transmission services, including video, audio, images, data. Digital TV has entered the global stage of rapid development. Can be expected in the coming years, and digital TV-related business will grow substantially. The resulting problem is that when the digital TV can provide many times the amount of current programs and a variety of business programs, the user how to easily find the programs and information? Electronic Program Guide (EPG) is clearly an essential tool.

Electronic program guide to provide users with an easy to use, friendly interface, you can quickly access a program, users can also watch one or more of the functional channels, or even all channels will broadcast the show recently. At the same time, EPG can provide classification, can help users browse and select the types of programs. Of course, the business provider of electronic program guide is also very important.

Digital television information 1, program description information In digital television, all the information and signals, including video, audio, text, pictures have been digitized into the data. Before data transmission in accordance with relevant standards (usually MPEG-2) package, the formation of a fixed length of transmission (TS) packets, MPEG-2, TS packet length is 188 bytes, and then quickly transferred to the destination through the network. For the same length TS packets, without guidance information, the receiver decoder is unable to find the necessary code stream. Therefore, the specific definition MPEG-2 in the PSI. PSI's role is to automatically set and guide the decoder to decode. PSI from the program association table (PAT), Conditional Access Table (CAT), Program Map Table (PMT) and Network Information Table (NIT), each table is divided into several sections of mapping (transformation) to the TS in the transmission.

PSI contains several tables decoding and information needed to reproduce the program, its main role is to find programs and to extract the bit stream. PAT is a table where the root of all its PID value of 0. Practical application, a decoder to decode on a particular stream, the first to find the PAT. Then find the required PAT program (such as program 1), according to program an appropriate PMT's PID (eg 22), to find programs 1 PMT. PMT may include multiple digital bit stream (including the video stream, audio stream and data stream), each stream has a PID. If you want to decode the video stream, found in the PMT PID video stream is 54, to the TS in the package to find PID 54 and PID 54 all packages sent to the video decoder. In PAT, the program 0 is always reserved for the NIT.

PID is a decimal value

here, in the standard distribution of PID values are in hexadecimal, that is, beginning with the value 0 × said. 22,54, such as decimal, hexadecimal, respectively, in a 0 × 16,0 × 36.

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