The CMMB technical standard is a mobile multimedia broadcast TV standard organized and developed by the State Administration of Radio, Film and Television. It is applicable to mobile mobile terminals with various screens of 7 inches or less, including mobile phones, GPS, MP4, digital cameras, etc. CMMB has the same national standard, wide network coverage, good mobility, rich programs, and mature terminal solutions. In September 2008, the Radio and Television Bureau directly under the State Administration of Radio, Film and Television established China Broadcasting Satellite Mobile Broadcasting Co., Ltd., responsible for the operation and promotion of the national CMMB, and formed a three-level operational structure with local radio and television. On March 16, 2009, Shanghai Wenguang took the lead in commercial operation. As of the end of April, CMMB signals have covered 137 cities across the country. According to the plan announced by the State Administration of Radio, Film and Television, the official commercial operation of 37 cities nationwide in July 2009, the CMMB signal will cover 337 cities nationwide by the end of 2009. On January 4, 2009, "Mobile Multimedia Broadcasting Part 10: Secure Broadcasting" was officially promulgated. The State Administration of Radio, Film and Television has promulgated ten mobile multimedia industry standards, and the CMMB standard is more perfect. This article will briefly introduce the principle, function and implementation method of "Mobile Multimedia Broadcasting Part 10: Secure Broadcasting".
This article refers to the address: http://
Principle and application of secure broadcasting
The secure broadcast technology enables the mobile multimedia terminal to have the ability to authenticate the legitimacy of the multimedia broadcast service by inserting secure broadcast information into the mobile multimedia broadcast signal. That is, when the mobile multimedia broadcast is maliciously replaced or falsified during the transmission process, the terminal can stop the illegal service presentation in time.
The secure broadcast system is composed of a front-end subsystem and a terminal module, wherein the front-end subsystem implements generation and transmission of secure broadcast information, and the terminal module implements reception and processing of secure broadcast information.
The secure broadcast front-end subsystem obtains the multiplexing control information table and the service characteristic information, and generates secure broadcast information according to the information, and multiplexes the transmission in the form of data service. The multiplexing subsystem uses a separate multiplex subframe to carry the secure broadcast information, assigns a service identification number thereto, and transmits it via the broadcast channel.
When the terminal receives the mobile multimedia broadcast service content, the secure broadcast terminal module obtains the secure broadcast information from the transmission frame according to the service identification number, and verifies the security broadcast information, and confirms the legality of the broadcast service content according to the verification result. To allow or prohibit business presentation.
The role of secure broadcasting
Compared with traditional TV, CMMB can use its own bandwidth advantage to provide various data services, including traffic guidance, stock market, e-magazine, life consultation, push download and so on. Through the backhaul of the mobile communication network, the CMMB terminal can also implement functions such as interaction and online payment. Of course, such a variety of applications must have a secure network as a guarantee. Imagine that if there is no safe broadcasting, the criminals may use the high-power mobile transmitting station to illegally broadcast in the area where the CMMB terminal is concentrated in order to achieve personal purposes. At this time, the interfered terminal will receive the poison from the illegal radio station. The TV program of the audience's thoughts, or the TV shopping channel that has been tampered with by telephone and bank account number, is not only the consumer but also the operator suffers a major loss.
The goal of the State Administration of Radio, Film and Television is to establish a mobile radio and television system that combines “the integration of heaven and earth, integration of stars and networks, unified standards, and national roamingâ€. In the future, it will rely on high-power satellites to cover CMMB signals in the Gwangju region, if illegal molecules adopt certain technologies to satellites. With direct control, illegal signals can be covered nationwide. Of course, this is only an assumption, but secure broadcast technology can guarantee that this assumption will never be established. 
Implementation of Secure Broadcast in CMMB Terminal
Tsinghua Tongfang Electronic Equipment Co., Ltd. introduced the TF376 security chip solution according to the "Safe Broadcasting" standard. By using the TF376 scheme, the terminal manufacturer can implement the secure broadcast function in the shortest time, and the CA function of the SMD mode can be conveniently implemented.
The figure above shows the hardware connection diagram of TF376 in the CMMB terminal. The TF376 is connected to the AP (application processor) or CP (coprocessor) of the terminal through the UART interface. The SMD CA chip of Nagra is connected to the TF376 through the 7816 interface. When the CMMB terminal system works, the AP or CP demultiplexes the received CMMB code stream to obtain a multiplex frame, and transmits the multiplex frame to the TF376 software module, and the TF376 software module performs CA descrambling on the corresponding multiplex frame. Secure broadcast information processing, the player can obtain descrambled clear stream data from the TF376 software module and decode it.
For TD-SCDMA terminals using MBBMS, the hardware connection shown in the figure below can be used.
In this system, the demultiplexing and descrambling work is done in TD Baseband, and the descrambled clear stream is sent to the TF376 software module for secure broadcast information processing, and the processed code stream is sent to the Decoder for decoding.
Shanghai Fengbao Electronic Technology Co., Ltd. has been paying attention to the CMMB industry since 2006 and is actively cooperating with Tsinghua Tongfang Electronic Equipment Co., Ltd. to provide secure broadcast +CA solutions for CMMB terminal manufacturers. The products of many terminal manufacturers have been mass-produced. . This solution is applicable to all types of platforms and can help terminal manufacturers to complete secure broadcast and CA functions in the shortest time. At the same time, TF376 built-in UnionPay payment module can easily realize the payment problem of CMMB terminal, and it is convenient for operators to carry out various value-added service applications.
Shanghai Fengbao Electronic Technology Co., Ltd. cooperated with Tsinghua Tongfang Electronic Equipment Co., Ltd. and Shanghai Jingda Digital to develop the world's first USB Dongle solution with built-in SMD CA and secure broadcasting. This program has been certified by Nagra and Radio and Television Planning Institute. Mass production has been achieved.
Hp Laptop 14-Dq 14-Fq,Hp 14-Fq Palmrest,Hp 14-Dq Palmrest,Hp 14-Fq Keyboard
S-yuan Electronic Technology Limited , https://www.syuanelectronic.com