CN1960552A - Receiving terminal with separated device and card of mobile multimedia service - Google Patents

Abstract

A mobile multimedia service receiving terminal with machine-card separation, including a multimedia broadcast radio frequency receiving module, a demodulation module, a demultiplexing module, a decoding module, and an output module, which respectively complete the reception, demodulation, demultiplexing, and decoding of multimedia broadcasting data . Output function, wherein, the transport stream formed by the demultiplexing module includes scrambled program stream, authorization control information, and encrypted control word; the terminal also includes a conditional access card installed in the terminal and an integrated The descrambling module in the card or in the terminal, the conditional access card communicates with the demultiplexing module through the interface protocol, matches the authorization control information contained in the transmission stream with the service authorization information stored in the card for the operator, and according to the authorization Authorization generates and descrambles the control word to the descrambling module, and the descrambling module communicates with the demultiplexing module and the decoding module through the interface protocol, descrambles the scrambled program stream generated by the demultiplexing module, and sends the descrambled program Stream input decoding module.

Description

A mobile multimedia service receiving terminal with machine-card separation

technical field

The invention relates to a receiving terminal of mobile multimedia broadcasting service.

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 playback function of MP3 and MP4, and has a broad market prospect.

Contents of the invention

The purpose of the present invention is to provide a multi-functional mobile multimedia service receiving terminal with machine-card separation. Users can purchase and replace conditional receiving cards according to needs, and enjoy personalized multimedia broadcasting services.

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

A mobile multimedia service receiving terminal with machine-card separation, including a multimedia broadcast radio frequency receiving module, a demodulation module, a demultiplexing module, a decoding module, and an output module, which respectively complete the reception, demodulation, demultiplexing, and decoding of multimedia broadcasting data . An output function, wherein the transport stream formed by the demultiplexing module includes a scrambled program stream, authorization control information, and an encrypted control word, wherein the terminal further includes:

The conditional access card installed in the terminal communicates with the demultiplexing module through the interface protocol, matches the authorization control information contained in the transmission stream with the service authorization information of the operator stored in the card for the user, and judges Whether the terminal user has permission to watch the program, and if so, generates a descrambling control word according to the encrypted control word;

The descrambling module communicates with the demultiplexing module and the decoding module through the interface protocol, and receives the descrambling control word generated by the conditional access card through the interface protocol, and uses the descrambling control word to scramble the demultiplexing module. The program stream is descrambled, and the descrambled program stream is input into the decoding module for decoding.

The above descrambling module can be integrated in the conditional access card; in order to reduce the cost of the conditional access card, the above descrambling module can also be integrated in the terminal and separated from the conditional access card.

The decoding module includes a video and audio decoder, which performs video and audio decoding on the input transport stream; and also includes a data file processor, which performs data file processing on the input transport stream.

The beneficial effect of the present invention is that: since the conditional access card is installed in the terminal, it communicates with the relevant modules of the terminal through the general interface to complete the authentication of the user, so that the terminal realizes the separation of the machine and the card, which is convenient for the broadcasting operator to carry out business and Promotion, for multimedia broadcasting operators, they can provide condition cards of various program packages for users to choose, and develop rich value-added service applications. The operation mode of charging, on-demand and charging by time. 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 schematic diagram of the principle of an implementation of a mobile multimedia receiving terminal with machine-card separation according to the present invention.

FIG. 2 is a schematic diagram of another implementation of the mobile multimedia receiving terminal with machine-card separation according to the present invention.

Detailed ways

Referring to Fig. 1, the mobile multimedia service receiving terminal of machine-card separation of the present invention comprises multimedia broadcast radio frequency receiving module 1, demodulation module 2, demultiplexing module 3, conditional access card 6, decoding module 4, output module 5, wherein The descrambling module is integrated in the conditional access card 6, and is connected with the demultiplexing module 3 and the decoding module 4 through a common interface; the multimedia broadcast radio frequency receiving module 1, the demodulation module 2, the demultiplexing module 3, and the conditional access card 6 , the decoding module 4 and the output module 5 perform data transmission in sequence.

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, authorization control information and encrypted control word (CW, Control Word), program guide information, transport stream It is transmitted to the conditional access card 6 through the interface protocol; the service authorization information of the broadcast operator to the user is arranged in the conditional access card 6, 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 there is authority, then Generate the descrambling control word according to the encryption control word, and the descrambling module in the conditional access card descrambles the audio and video streams according to the descrambling control word into the audio and video streams of the original encoding, and outputs the multimedia decoding module 4 of the terminal; The decoding module 4 performs audio and video decoding on the descrambled transport stream, and restores the original video and audio signals to the multimedia broadcasting output module 5; the output module 5 outputs the video signal to the display screen, and outputs the audio signal to the audio output Devices, such as speakers or earphones, users can watch rich and colorful, high-quality multimedia audio and video programs.

In the above solution, the descrambling module is integrated in the conditional access card, and the conditional access card 6 completes the descrambling function. It is also possible to integrate a dedicated descrambling module 7 in the terminal, and the descrambling function of the conditional access card is completed by the descrambling module 7, as shown in FIG. 2 .

In the embodiment shown in Figure 2, the terminal includes a multimedia broadcasting radio frequency receiving module 1, a demodulation module 2, a demultiplexing module 3, a descrambling module 7, a decoding module 4, an output module 5 and a conditional access card 6; the conditional access card 6. Perform data exchange with the demultiplexing module 3 and the descrambling module 7 through an interface protocol. The advantage of doing this is that the processing capability of the conditional access card is low, and the cost of the conditional access card can be reduced.

At this time, the multimedia broadcast demultiplexing module 3 sends the scrambled transmission stream to the conditional access card 6 and the multimedia broadcast descrambling module 7, and the conditional access card 6 passes the descrambling control word through a safe interface protocol after completing the service authentication. Pass it to the multimedia broadcast descrambling module 7, and the descrambling module 7 descrambles the audio and video streams according to the descrambling control word, and outputs it to the decoding module 4 of the multimedia broadcasting of the terminal.

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

In order to be portable and mobile, the power supply of the complete terminal device of the present invention can be provided by batteries.

In addition, the terminal of the present invention can include a USB interface for communicating with other devices and charging the battery; a storage module for storing multimedia file data; devices such as earphone jacks can also be set; and can support MP3, MP4 playback, playback Program content recording and other functions.

Claims (10)

1. A mobile multimedia service receiving terminal with machine-card separation, including a multimedia broadcast radio frequency receiving module, a demodulation module, a demultiplexing module, a decoding module, and an output module, which respectively complete the reception, demodulation, and demultiplexing of multimedia broadcasting data , decoding, and output functions, wherein the transport stream formed by the demultiplexing module includes scrambled program streams, authorization control information, and encrypted control words, wherein the terminal further includes: The conditional access card installed in the terminal communicates with the demultiplexing module through the interface protocol, matches the authorization control information contained in the transmission stream with the service authorization information of the operator stored in the card for the user, and judges Whether the terminal user has permission to watch the program, and if so, generates a descrambling control word according to the encrypted control word; The descrambling module communicates with the demultiplexing module and the decoding module through the interface protocol, and receives the descrambling control word generated by the conditional access card through the interface protocol, and uses the descrambling control word to scramble the demultiplexing module. The program stream is descrambled, and the descrambled program stream is input into the decoding module for decoding. 2. The terminal according to claim 1, wherein the descrambling module is integrated in the conditional access card. 3. The terminal according to claim 1, wherein the descrambling module is integrated in the terminal and separated from the conditional access card. 4. 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. 5. 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. 6. 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. 7. The terminal according to claim 1, wherein the power supply of the terminal is provided by a battery. 8. The terminal according to claim 1, wherein the terminal is provided with a USB interface for communicating with other devices and charging the battery. 9. The terminal according to claim 1, characterized in that: said terminal further comprises a storage module for storing multimedia file data. 10. The terminal according to claim 1, characterized in that: said terminal is provided with an earphone jack.

Images