CN101345847A

CN101345847A - Digital television terminal implementing method based on USB authorization mode

Info

Publication number: CN101345847A
Application number: CNA200810022469XA
Authority: CN
Inventors: 白建川; 阙秀震
Original assignee: Nanjing Panda Electronics Co Ltd; Panda Electronics Group Co Ltd
Current assignee: Nanjing Panda Electronics Co Ltd; Panda Electronics Group Co Ltd
Priority date: 2008-07-22
Filing date: 2008-07-22
Publication date: 2009-01-14

Abstract

The present invention discloses a digital television terminal implementing method based on USB authorization mode which loads a standard authorization module and an application function module of radio and television operators through USB apparatus. The invention is characterized by: a. defining a standard hardware and software interfaces and application function module of the digital television apparatus; b. establishing a digital television terminal equipment matching with step a; establishing a USB hardware carrier apparatus matching with the step b. The invention also includes the following steps: a tuning step, a channel demodulation and decoding step, a source decoding step, a judging step, a determining step, and a video and audio decoding step, wherein, in the source decoding step, the working principle of the descrambling and decryption function module in the USB is identical to the working principle of a receiving control module in the conventional conditional access system CA. The invention can protect the benefits of terminal equipment manufacturers and local radio and television operators in a maximum extent, to reach the object of effective and full use of the resources.

Description

Digital TV terminal implementation method based on the USB authorization

Technical field

The invention belongs to the television condition receiving system field, specifically a kind of digital TV terminal implementation method based on the USB authorization.

Background technology

In the present Digital Television implementation, the various places radio and TV operator adopts different condition receiving system CA, the mandate interface of rating and application software functional module disunity, cause the equipment business men need be at the software of zones of different customization different editions, the people is the compartmentalization otherness that causes receiving equipment, can't realize the versatility of equipment, and the essence of problem is: the leading side who realizes difference is various places broadcasting and TV rather than equipment manufacturers.

In digital television system, CA is the important means that guarantees the paid rating of user.The condition receiving course of order domestic user end relies on the smart card in the set-top box to carry out fully.

Traditional condition receiving system as shown in Figure 1, scrambler utilizes control word generator generation control word CW that MPEG (Motion Picture Experts Group) transport stream is carried out scrambling, use business cipher key SK that CW and other information are encrypted formation Entitlement Control Message ECM simultaneously, use individual distributing key PDK that SK and authorization message are encrypted formation Entitlement Management Message EMM.EMM, ECM and mpeg transport stream form new TS transport stream through multiplexing back, it is sent to each set-top box of user side by the mode of One-to-All Broadcast, the user is decrypted according to opposite order by smart card of set-top box, finally takes out CW and finishes descrambling to programme content.

We can see by above analysis, the encrypt and decrypt pilot process does not pass through third-party affirmation, the obtaining of key that yet promptly is used for deciphering do not need to be confirmed by the third party again, in brief, deciphering relevant " instrument " used is that pre-determined (each terminal equipment has a unduplicated unique address code; Have encryption system number and keys such as ECMK2, EMMK2 in the smart card), to this, be feasible based on the soft ware authorization dynamic load implementation of USB but make up us.

Summary of the invention

The present invention is directed to can't be in the strange land general shortcoming of existing apparatus of digital television receiving, disclose and a kind ofly loaded radio and TV operator's the standard authorization module and the digital TV terminal implementation method based on the USB authorization of standard application functional module by USB device.

Technical scheme of the present invention is:

A kind of digital TV terminal implementation method based on the USB authorization is characterized in that,

A. define the digital television devices interface between software and hardware and the applied function module of standard;

B. set up the digital TV terminal equipment that is complementary with a;

C. set up the USB hardware carrier equipment that is complementary with b;

Wherein, the digital TV terminal implementation method based on the USB authorization comprises the following steps:

Tuning step is used for the cable TV signal of high frequency is tuned as intermediate-freuqncy signal output;

Channel demodulation and decoding step are used for intermediate-freuqncy signal is carried out the demodulation sign indicating number, output base band TS stream;

The source coding step, descrambling, decipher function module realize the demultiplexing to base band TS stream, outputting video streams ES/ audio stream PES stream in the application USB hardware carrier equipment; With

Determining step is used to judge whether USB hardware carrier equipment can finish descrambling, the deciphering of base band TS stream;

Determining step is used for when the result of described determining step is "Yes", and the video flowing ES/ audio stream PES that output is authorized flows and when the result of described determining step is "No", exports free video flowing ES/ audio stream PES stream;

Look, the audio decoder step, be used for stream decoding with video flowing ES/ audio stream PES, output is looked, audio signal.

Wherein:

In the described source coding step, the operation principle that receives control module among the USB among the operation principle of descrambling, decipher function module and the traditional condition receiving system CA is identical.

Compared with prior art, the invention has the beneficial effects as follows;

But realize technology by the authorization module of standard in the USB hardware carrier, the dynamic load of applied function module, the separable implementation of digital TV terminal equipment of a kind of mandate, applied function module and standard is provided for the Digital Television in the whole nation, can solve in the market since the trouble waters that mandate interface standard not of the same race, different application function coexistences are caused (various places authorization method is inconsistent, and different CA is arranged; Apparatus of digital television receiving can't be general in the strange land; The equipment business men need be at software of zones of different customization different editions or the like), can protect terminal software equipment vendor, various places radio and TV operator's interests to the full extent, reach resources effective and the purpose that makes full use of.USB interface is a standard interface, and user side is easy to operate.

Description of drawings

Fig. 1 is traditional condition receiving system schematic block diagram.

Fig. 2 is a workflow diagram of the present invention.

Fig. 3 is the workflow diagram in concrete enforcement of the present invention.

Embodiment

Bottom does the present invention with embodiment in conjunction with the accompanying drawings and describes in further detail:

At first:

The digital television devices interface between software and hardware and the applied function module of a. national broadcasting and TV merchant's cooperative television equipment vendor definition standard; B. the television equipment merchant sets up the digital TV terminal equipment that is complementary with a; C. national broadcasting and TV merchant sets up the USB hardware carrier equipment that is complementary with b.

The dynamically load authorization module of the broadcasting and TV merchant of country issue can be assigned to a unique sequence number, add unique identifier of the related hardware of the digital TV terminal equipment of having bought in our family, both carry out corresponding algorithm computation and obtain a user identity identification ID that can submit to the broadcasting and TV merchant when needing paid service, USB hardware carrier authorization module is owing to be dynamic load, descrambling wherein, the instrument that deciphering need be used (encryption system number and ECMK2, keys such as EMMK2) also be built in the software kit, if we need paid service consumption, must ownly initiatively apply for to the broadcasting and TV merchant, tell the broadcasting and TV merchant how many my unique identity recognition number ID of digital TV terminal equipment is, the broadcasting and TV merchant carries out the scrambling of related service according to this identity recognition number ID then, encrypt, our digital TV terminal utilizes the authorization module in the USB hardware carrier to carry out corresponding descrambling again, deciphering is up to the final rating of content.Do the licensing issue that can well solve the rating content like this, and solved traditional existing payment mode (receiving the mode of monthly rent), the user only need just can open the pattern of relevant payment business by buying debit card, this pattern is very similar to the consumption mode of mobile phone, consume in mobile phone but on a key point, have any different, because mobile phone consumption network is two-way, our system is an one-way transmission.

As shown in Figure 2, the digital TV terminal implementation method that the present invention is based on the USB authorization comprises the following steps:

Tuning step adopts tuner (can adopt model is the product of TDQG4-001A) that the cable TV signal of high frequency is tuned as intermediate-freuqncy signal output;

Channel demodulation and decoding step adopt channel demodulator (can adopt model is the product of LS8G52) that intermediate-freuqncy signal is carried out the demodulation sign indicating number, output base band TS stream;

Look, the audio decoder step, adopt Video Decoder (can adopt model is the product of ST7100), audio decoder (can adopt model is the product of ST7100) with the decoding of video flowing ES/ audio stream PES stream, output is looked, audio signal.

Wherein, in the described source coding step, the operation principle that receives control module among the USB among the operation principle of descrambling, decipher function module and the traditional condition receiving system CA is identical, and described operation principle has been done detailed introduction in background technology, no longer repeat at this.

As shown in Figure 3, in the practical application of Digital Television, at first system boot and initialization, USB hardware carrier equipment is inserted in the corresponding USB interface, in order to prevent that the user from using the key in the same USB carrier on different digital TV terminal equipment, improve the fail safe of authorization module, key of design regularly reads timer in the USB vehicle equipment, start this timer behind the system initialization, (can be tens seconds) just removes to read usb key as long as timer regularly expires, when the source coding step begins among Fig. 2, use the descrambling that the authorization module realization is flowed base band TS in the USB hardware carrier equipment, deciphering, when the key that provides when USB hardware carrier equipment is wrong, export free video flowing ES/ audio stream PES stream, when the key that provides when USB hardware carrier equipment is correct, the video flowing ES/ audio stream PES stream that output is authorized, video flowing ES/ audio stream PES flow point Jing Guo not looked, audio decoder is handled back output and is looked, audio signal, and showing on the display and in loud speaker, exporting respectively.

Claims

1. the digital TV terminal implementation method based on the USB authorization is characterized in that,

A. the digital television devices interface between software and hardware and the applied function module of standard;

B. set up the digital TV terminal equipment that is complementary with a;

C. set up the USB hardware carrier equipment that is complementary with b;

The digital TV terminal implementation method that the present invention is based on the USB authorization comprises the following steps:

2. the digital TV terminal implementation method based on the USB authorization according to claim 1, it is characterized in that, in the described source coding step, the operation principle that receives control module among the USB among the operation principle of descrambling, decipher function module and the traditional condition receiving system CA is identical.