Live satellite set-top box solution based on GX1121 and GX3001 - Power Circuit - Circuit Diagram

SMD aluminum electrolytic capacitor

MOS power IC full range

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

1. introduction

Direct broadcast satellite is an important part of China's innovative industry layout. It focuses on the latest achievements in satellite communication technology, microelectronics technology, computer technology and many other fields, greatly improving the coverage of China's radio and television, and enhancing the service capabilities of radio and television. Promote the improvement of technical research level including satellite design and manufacturing technology, program transmission technology, and safety broadcast technology, and promote the development of related product manufacturing and service industries and industrial upgrading. It is expected to form a market scale of hundreds of billions, which will eventually achieve a role in pulling GDP. At present, there is a huge demand for live broadcast satellites in China. Hangzhou Guoxin has been approved by the State Administration of Radio, Film and Television to develop ABS-S demodulation chips. In order to shorten the development cycle of manufacturers and reduce the bom of the whole machine, GX1121 (ABS-S solution) was launched. A complete solution for the live satellite set-top box of the GX3001 (MPEG2 decoder chip).

2. ABS-S set-top box function overview:

GX1121+GX3001 solution ABS-S set-top box is a digital satellite receiver that conforms to the software function and hardware index of China Broadcasting and Television Broadcasting Satellite "Village Communication". This program receiver demodulation conforms to China Advanced Broadcasting System (ABS-S) The specified modulation signal. The scheme has two video outputs, one S-VIDEO output, one channel left and right channel audio output, which can meet the audio and video output requirements of different users. The following are some supplementary instructions for the set-top box of the solution:

Support information service

Powerful program management

Remote upgrade via serial or satellite

The software interface is beautiful and easy to operate

3. DVB-C set-top box design based on GX1121 and GX3001

3.1 system hardware design

The following mainly introduces the design of our scheme from the channel and source of the system. Figure 1 is a block diagram of the system application of our solution:

Figure 5 software architecture diagram

Description of each module:

PSI/SIengine: In the application software, program search and EPG information need to obtain detailed data information of each table in PSI and SI. In addition, some data in the table need to be acquired or monitored in real time by software, so how to filter these tables And parsing needs to be organized in a certain way. PSI/SIengine effectively organizes the monitoring, filtering and analysis of PSI/SI tables, enhancing the real-time performance of software functions and the readability of code.

UI system: build a set-top box interface development platform, providing a rich variety of controls and powerful features to improve the efficiency of interface development.

NODE: Manages set-top box data storage, reduces fragmentation of flash, and ensures efficient storage and fast extraction of data.

Search: The receiving mechanism of the related table is built on the PSI/SI engine to complete the program search, sorting and saving of the set-top box. Program search includes single frequency search and automatic search.

EPG: The receiving mechanism of the related table is established on the PSI/SI engine. When the demultiplexing is not filtered to the EPG data, the EPG module is in a sleep state. When there is data, the EPG module can effectively and quickly parse the stored data. This can achieve the purpose of updating new data and deleting expired data in real time without wasting system resources.

Book: Implements the reserved program function, and the appointment time is automatically switched to the program reserved by the user.

Time: Implement two functions, one is to provide system time for the set-top box, and the other is to provide timer function for the above application and other modules in the same layer.

AV: Mainly for some operations on audio and video. Including playback programs, channel settings and reading, volume adjustment and reading, volume level settings and reading, TV broadcast system reading and setting.

Dbase: Call NODE to store, read, delete, modify, and increase the data of the set-top box.

Informationservice: Implements the filtering, collation, XML parsing and interface menu processing of information service data.

4. Conclusion

At present, many STB manufacturers in China have adopted the GX1121+GX3001 solution to pass the live broadcast star certification test of Radio and TV. At the same time, the overall performance of the program and the company's close-to-close service have been unanimously recognized by domestic STB manufacturers.

Due to the increasingly fierce market competition, STB manufacturers feel that the pressure on time-to-market is increasing, requiring chip suppliers to provide more comprehensive and efficient technical support. Therefore, the level of technical support of chip suppliers has become an important factor to consider when selecting STB vendors. In the past, foreign chip manufacturers mostly adopted the method of entrusting domestic agents to provide technical support, but now this model has been difficult to meet the dual requirements of the complete machine manufacturers for differentiated design and time to market. As a local company, Hangzhou Guoxin has unique advantages in technical support, in addition to providing a full set of GX1121, GX3001 development kits (including samples, evaluation boards, application manuals, evaluation software, standard C language drivers), The on-site support team consisting of chip designers completes all aspects of technical support from differentiated design, on-site debugging, software integration to mass production test solutions to ensure that customers can achieve mass production in the shortest possible time.

In short, in the face of good prospects and fierce competition, STB manufacturers need to adopt more flexible technical strategies to deal with various new design challenges. The complete solution of the live satellite set-top box based on GX1121 and GX3001 is your ideal choice.

references:

GX1121datasheet,HangzhouNationalChipScience&TechnologyCo.,Ltd;

GX3001datasheet,HangzhouNationalchipScience&TechnologyCo.,Ltd;

[3] Deng Yugui, etc., digital set-top box principle, application and maintenance, People's Posts and Telecommunications Press;

[4] Chinese People's Broadcasting and Television Standard GB/T233-2008;

[5] John G. Proakis, Modern Communication Systems, Electronics Industry Press;