CN1997144A - A receiving terminal of the mobile multi-media service - Google Patents

Abstract

A mobile multimedia service receiving terminal, including a multimedia broadcast radio frequency receiving module, a demodulation module, a demultiplexing module, a descrambling module, a decoding module, and an output module, which respectively complete the reception, demodulation, demultiplexing, and demultiplexing of multimedia broadcasting data. Scrambling, decoding, and output functions, characterized in that: a conditional access card is installed in the terminal, and the conditional access card has service authorization information of broadcast operators to users, which is used to complete identification of users and service authorization; the multimedia broadcasting The radio frequency receiving module, the demodulation module, the demultiplexing module, the descrambling module, the decoding module and the output module perform data transmission in sequence, and the conditional receiving card performs data exchange with the demultiplexing module and the descrambling module through the interface protocol.

Description

A mobile multimedia service receiving terminal

technical field

The invention relates to a mobile multimedia service receiving terminal.

Background technique

The mobile multimedia service based on the broadcast network has the advantages of high spectrum utilization, large capacity, relatively low construction cost, and wide audience. However, because there is no return channel, the protection and authorization of broadcast content is particularly important. Conditional Access (CA) technology is the most typical application of modern cryptography in the field of digital TV. It uses various digital technologies to scramble programs so that only authorized users can watch (listen) the scrambled programs. Programs have been widely used in the field of digital broadcasting. Conditional access users can use relevant services only with the authorization of the broadcasting operator, and can realize the paid service of the digital TV broadcasting system. Conditional access is an expansion of the management methods of broadcasting operators, enabling operators to authorize and control the information received by users. powerful tool.

Conditional access is mainly used in the field of digital TV broadcasting in two ways: organic card integration and machine card separation. In the machine card separation mode, users do not need to change the set-top box to watch programs of different CAs, but only need to change the conditional access card, which protects the user's investment. Users can freely choose their favorite programs, which has great flexibility and convenience; at the same time, the separation of machine and card solves the problem of incapable of large-scale production caused by CA differences, and has been widely used in the field of digital TV; However, in the field of mobile multimedia service receiving terminals, there is no mobile multimedia receiving device that separates the machine card (conditional access card) at present.

With the enhancement of integrated circuit technology and microchip processing capability and the reduction of power consumption, it is possible to realize the portable multimedia receiving terminal with machine-card separation. The multimedia service receiving terminal also has the function of playing MP3 and MP4, and has a broad market prospect.

Contents of the invention

The purpose of the present invention is to provide a mobile multimedia service receiving terminal, the user can purchase and replace the conditional access card according to the needs, and enjoy the personalized multimedia broadcasting service.

For realizing the purpose of the present invention, adopt following technical scheme:

A mobile multimedia service receiving terminal, including a multimedia broadcast radio frequency receiving module, a demodulation module, a demultiplexing module, a descrambling module, a decoding module, and an output module, which respectively complete the reception, demodulation, demultiplexing, and demultiplexing of multimedia broadcasting data. Scrambling, decoding, and output functions, characterized in that: a conditional access card is installed in the terminal, and the conditional access card has service authorization information of broadcast operators to users, which is used to complete identification of users and service authorization; the multimedia broadcasting The radio frequency receiving module, the demodulation module, the demultiplexing module, the descrambling module, the decoding module and the output module perform data transmission in sequence, and the conditional receiving card performs data exchange with the demultiplexing module and the descrambling module through the interface protocol.

The beneficial effect of the present invention is that: since the conditional access card is installed in the terminal, the terminal realizes the separation of the machine and the card, which is convenient for the broadcasting operator to develop and promote the business, and for the multimedia broadcasting operator, it can provide the conditions for various program packages Cards are available for users to choose, and a wealth of value-added service applications can be carried out. In addition to the operation model of the original digital TV network with a single monthly fee, it can also carry out the operation models of pay-per-view, on-demand and time-based charges. For users, they can freely choose multimedia program packages by changing the card, and at the same time, the original service of the terminal can also be used after the user changes the card. The present invention is small and exquisite in volume, is easy to carry, can watch digital TV (audio) programs at any time, and data services such as electronic magazines, and can also have MP3, MP4 playing functions.

Description of drawings

Fig. 1 is a principle schematic diagram of an implementation manner of a mobile multimedia service receiving terminal of the present invention.

Detailed ways

Referring to Fig. 1, the multimedia service receiving terminal of the present invention includes a multimedia broadcast radio frequency receiving module 1, a demodulation module 2, a demultiplexing module 3, a conditional access card 6, a descrambling module 7, a decoding module 4, and an output module 5, wherein The conditional receiving card 6 is connected with the demultiplexing module 3 and the decoding module 4 through a general interface; the multimedia broadcast radio frequency receiving module 1, the demodulation module 2, the demultiplexing module 3, the descrambling module 7, the decoding module 4, the output module 5 in turn for data transmission.

Multimedia broadcasting radio frequency receiving module 1 receives the digital program signal of mobile multimedia broadcasting network (such as CMMB, DVB-H, S-DMB, T-DMB) from antenna 8, comprises TV, audio frequency, data file (such as electronic magazine) etc., receives Module 1 amplifies the input signal and transmits it to demodulation module 2; multimedia broadcast demodulation module 2 completes channel decoding, separates the transmission code stream containing audio, video and other data information from the carrier, and transmits it to demultiplexing module 3; The demultiplexing module 3 demultiplexes the input code stream to form a transport stream (TS stream), which includes a scrambled program stream and encrypted control word (CW, Control Word), program guide information, and the transport stream is transmitted through an interface protocol Give the conditional access card 6; in the conditional access card 6, there is the business authorization information of the broadcast operator to the user, and the conditional access card judges whether the user has the authority to watch the program according to the operator's authorization to the user, and if so, according to the encrypted control word Generate the descrambling control word, and transmit it to the descrambling module 7 through the interface protocol, and the descrambling module descrambles the audio and video streams into the original coded audio and video streams according to the descrambling control word, and outputs them to the multimedia decoding module of the terminal 4; the decoding module 4 carries out audio and video decoding to the transport stream after descrambling (the terminal also has a data file processing module, if it is a data file, then it is processed by the data file processing module), and the original video and audio signals are transmitted to Multimedia broadcasting output module 5; the output module 5 outputs video signals to the display screen and audio signals to audio output devices, such as speakers or earphones, so that users can watch colorful and high-quality multimedia audio and video programs.

The service charging module can be integrated in the conditional access card of the present invention to complete the service charging function.

In addition, the terminal of the present invention may include devices such as a USB interface, a storage module (for storing multimedia file data), an earphone interface, and the like; and may support functions such as playing MP3 and MP4, recording of playing program content, and the like.

In order to be portable and mobile, the power supply of the complete terminal device of the present invention can be provided by a battery, and the battery can be charged through a USB interface.

Claims (10)

1. A mobile multimedia service receiving terminal, comprising a multimedia broadcasting radio frequency receiving module, a demodulation module, a demultiplexing module, a descrambling module, a decoding module, and an output module, which respectively complete the reception, demodulation, and demultiplexing of multimedia broadcasting data , descrambling, decoding, and output functions, characterized in that: a conditional access card is installed in the terminal, and the conditional access card has business authorization information of the broadcast operator to the user, which is used to complete the identification of the user and business authorization; The multimedia broadcast radio frequency receiving module, the demodulation module, the demultiplexing module, the descrambling module, the decoding module, and the output module perform data transmission in sequence, and the conditional access card performs data exchange with the demultiplexing module and the descrambling module through the interface protocol. 2. The terminal according to claim 1, characterized in that: the radio frequency receiving module receives the digital program signal of the multimedia broadcasting network and sends it to the demodulation module; the demodulation module separates the audio, video and other data information from the carrier The transmission stream of the demultiplexing module is sent to the demultiplexing module; the demultiplexing module distinguishes and extracts the scrambled program stream and encrypted control word of different programs and sends them to the descrambling module and the conditional access card respectively; the conditional access card is authorized by the operator to the user, Generate a descrambling control word according to the encrypted control word, and output it to the descrambling module; the descrambling module descrambles the audio and video streams according to the descrambling control word and sends them to the decoding module; the decoding module performs audio processing on the descrambled transport stream , Video decoding, restore the original video and audio signals to the output module; the output module outputs video signals to the display screen, and outputs audio signals to the audio output device. 3. The terminal according to claim 1, wherein the decoding module includes a video and audio decoder for performing video and audio decoding on the input transport stream. 4. The terminal according to claim 1, wherein the decoding module includes a data file processor, which performs data file processing on the input transport stream. 5. The terminal according to claim 1, characterized in that: said conditional access card is integrated with a service charging module to complete the service charging function. 6. The terminal according to claim 1, characterized in that: said terminal is provided with a USB interface. 7. The terminal according to claim 1, characterized in that: said terminal further comprises a storage module for storing multimedia file data. 8. The terminal according to claim 1, wherein the terminal is provided with an earphone jack. 9. The terminal according to claim 1, wherein the power supply of the terminal is provided by a battery. 10. The terminal according to claim 6, wherein the power supply of the terminal is provided by a battery, and the battery is charged through a USB interface.