Decoder/coder compound combined engineering machine

Abstract

A composite engineering machine of coder / decoder consists of decoder, serializer, audio / video interface and coder. It is featured as using decoder to receive reach-through multi-path complex stream and to decode program signal of single channel then outputting decoded audio / video signal through audio / video interface, using coder to code and complex audio / video signal outputted by decoder then using serializer to output asynchronous serial digital signal.

Description

technical field [0001] The invention belongs to the field of digital TV transmission, and its application environment is on the cable / wireless digital TV front-end content transmission platform, and is widely used in digital TV channel integration and content integration projects, and its specific application points to DVB format transmission code stream (Transport Stream, TS ) Source coder / decoder compound combination engineering machine. Background technique [0002] Since my country's digital TV has taken cable TV as a breakthrough point, under the promotion of the national administration, the overall conversion of cable TV digitalization has been fully rolled out across the country, and a large number of front-end integration and transmission platforms for local access networks have emerged in 2,700 cities in my country (many There are multiple operators in one place in one region, which produce not only one set of front-end platforms), they all need to use DVB decoders a...

AI Technical Summary

Problems solved by technology

In a specific application, the satellite transmission adopts the European DVB-S standard. When one digital TV program is to be multiplexed and integrated into a centralized service platform in a certain area, there will be three situations, or the satellite transmission The incoming programs need a DVB-S satellite receiver, which is encoded and multiplexed after receiving the scheduled programs; or the cable transmission requires a DVB-C set-top box, which decodes the scheduled programs and then encodes and multiplexes them. ; or from the long-distance optical fiber SDH synchronous digital transmission system, it is necessary to provide an ASI (Ansynchronic Series Interface) asynchronous serial interface with a bandwidth of 44.736Mbps through a DS-3 adapter, and then use a decoder to process one of the video content Analysis, these three situations need to be realized through the ASI interface on the front-end platform, but ordinary satellite receivers and set-top boxes can only provide A / V output interfaces, and SDH synchronous digital sequences cannot provide display and monitoring of video content If you want to realize the recombination of program content and the real-time display of broadcast control and monitoring, the general domestic application is to add an MPEG-2 encoder to the integrated platform, and then integrate and use it after entering the data multiplexer through the ASI interface. Here comes the problem:

For this reason, some well-known manufacturers at home and abroad (such as Tongzhou Electronics and Jiuzhou Technology in China) have successively developed satellite receivers with ASI interfaces, but their designs are all aimed at the application of single program reception, and cannot use SI / PSI The unified distribution of digital TV service information and content information and the composition of the MPTS transport stream combination on the platform cannot use the built-in encoding function to develop new content integration methods. Although well-known foreign manufacturers (such as THOMSON) have this function, the peripheral The auxiliary functions are too complicated and the cost is too high (about 8000 euros);

[0006] (3) Although there are examples of engineering applications for satellite receivers at home and abroad, the DVB-C set-top box is not. It is completely a home computer, which neither supports 7×24 hours of continuous work nor supports engineering applications. It is not necessary to provide ASI interface for engineering application, so it is not competent for this application at all. Although it has many applications now, it is only a temporary substitute, because there is no engineering application at home and abroad. DVB-C decoder with ASI input interface;

[0007] (4) In addition, in the real-time monitoring of the working status of the front-end sending platform, the current domestic applications are provided by the DVB-C set-top box to provide A / V video output, or enter the multi-screen splitter to monitor on the large screen, or directly Access to the monitor to monitor, which requires the TS stream to be modulated by the QAM digital modulator to the corresponding RF frequency at the output of the front-end multiplexer, so that the program of the predetermined channel can be monitored through the RF input of the set-top box. When using QAM modulation not only increases the system cost, but also the item box is a civilian product after all, so it is not suitable for engineering applications. Once the remote control is touched, all preset programs will be changed, and it cannot work for a long time, which is very inapplicable

The main reason for this abnormal phenomenon is that when developing the DVB system in Europe, the management function of system monitoring and monitoring work status is based on the data display and parameter management of the system working status, and does not need to be broadcast directly through video. However, the reality in our country is different. First, most of the front-line maintenance personnel on the job site come from the analog era. The main working status of analog video broadcasting is monitored through monitors. This traditional management The model maintains a strong inertia. The staff and technical managers have not yet achieved a fundamental change from visual management to data process management. Second, China's national conditions require "performance projects". Leaders and decision makers can only directly judge the status of the content, but cannot accurately analyze the working status of the content through technical data, they need a direct display on the large screen to express the program content and working status

Therefore, on various digital TV front-end platforms across the country, the same real-time monitoring mode displayed on the monitor status as traditional TV broadcasting is indispensable.

[0008] (5) In the design of digital front-end system monitoring and monitoring, foreign countries basically realize it through the centralized display of system processing and the process management of overall monitoring. Although the design idea is advanced, the cost is extremely high (1 set / set of medium-sized system equipment It needs more than 1 million US dollars), which is not suitable for my country's national conditions. Even the CCTV with strong financial resources has no option to use this type of centralized equipment for its display and monitoring part.

At present, most of the domestic monitoring systems are replaced by set-top boxes by adding modulation equipment, which not only increases the operating cost, but also causes wrong display (the instability of civilian products can easily cause wrong display for long-term work)

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