WO2018086477A1

WO2018086477A1 - Digital television descrambling method and device

Info

Publication number: WO2018086477A1
Application number: PCT/CN2017/109052
Authority: WO
Inventors: 高翔
Original assignee: 深圳创维数字技术有限公司
Priority date: 2016-11-08
Filing date: 2017-11-02
Publication date: 2018-05-17
Also published as: CN106412698A; CN106412698B

Abstract

A digital television descrambling method and device. The method comprises: receiving a channel switching command for switching to a target program; determining whether a prestored authentication control information contains target authentication control information of the target program; if so, transmitting to a smart card the target authentication control information; receiving a control word responded by the smart card; and configuring, according to the control word, a descrambler, and descrambling the target program.

Description

Digital television descrambling method and device

Technical field

The present disclosure relates to the field of digital television, for example, to a method and apparatus for digital television descrambling.

Background technique

Digital TV provides people with rich program content and high-quality audio-visual enjoyment. Compared with analog TV, digital TV has small signal loss and good reception effect, but digital TV has an obvious disadvantage. It is slow for users to scramble programs. The experience is poor.

A commonly used method for fast channel switching descrambling is to simultaneously descramble a three-way program, that is, simultaneously parsing two programs before and after the scrambled program in the scrambled program and the program list into a control word (Control Word, CW). Some methods even parse all the programs at the current frequency point out of the CW. Considering the limited use resources of the processor in the top box, the total number of filters (Filter) and the smart card communication time, etc., all the current frequencies are analyzed. The CW of the program is unrealistic, and simultaneously descrambling the three-way program will take up more hardware resources.

Summary of the invention

The present disclosure provides a method and apparatus for digital television descrambling, which can quickly descramble a channel for a scrambled program with less hardware resources.

In a first aspect, the embodiment provides a method for descrambling digital television, including:

Receiving a channel change instruction for switching to the target program;

Determining whether there is a target authorization control letter of the target program in the pre-stored authorization control information data interest;

And if the target authorization control information of the target program is included in the pre-stored authorization control information data, sending the target authorization control information to the smart card, and receiving the control word returned by the smart card;

A descrambler is provided according to the control word to descramble the target program.

In a second aspect, the embodiment further provides a device for descrambling digital television, including:

a channel change command receiving module configured to receive a channel change command for switching to the target program;

The determining module is configured to determine whether the target authorization control information of the target program is included in the pre-stored authorization control information data;

a control word extraction module, configured to send the target authorization control information to the smart card, and receive the control word returned by the smart card, if it is determined that the pre-stored authorization control information data has the target authorization control information of the target program;

The first descrambling module is configured to set a descrambler according to the control word to descramble the target program.

The embodiment further provides a computer readable storage medium storing computer executable instructions for performing the above method of digital television descrambling.

The embodiment further provides a set top box including one or more processors, a memory, and one or more programs, the one or more programs being stored in the memory, when executed by one or more processors, Perform the above method of digital TV descrambling.

The embodiment further provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions, when the program instructions are executed by a computer A method of causing the computer to perform any of the above-described digital television descrambling.

The digital television descrambling method and apparatus provided by the present disclosure directly extracts a control word from a smart card according to the authorization control information when there is authorization control information of the target program in the pre-stored authorization control information data. It is not necessary to obtain the control word by acquiring the program map of the target program, parsing and filtering, etc., and the descrambling time when the digital TV is changed is reduced to achieve fast descrambling when occupying less hardware resources.

DRAWINGS

In order to explain the technical solutions in the embodiment, the drawings to be used in the description of the embodiment will be described below.

1 is a schematic flow chart of a method for descrambling digital television according to Embodiment 1;

2 is a schematic flow chart of a method for descrambling digital television provided by Embodiment 2;

3 is a schematic structural diagram of an apparatus for descrambling digital television provided by Embodiment 3;

4 is a schematic structural diagram of an apparatus for descrambling digital television provided by Embodiment 4;

FIG. 5 is a schematic structural diagram of hardware of a set top box according to Embodiment 5.

detailed description

The technical solution of this embodiment will be described below with reference to the accompanying drawings.

Embodiment 1

Please refer to FIG. 1. FIG. 1 is a schematic flowchart diagram of a method for descrambling digital television provided by this embodiment. The method of this embodiment can be performed by a set top box of a digital television, and can be applied to a scene in which a digital television switches a program.

The method for descrambling digital television of this embodiment may include the following steps.

In step 110, a channel change instruction to switch to the target program is received.

Exemplarily, the user can issue various commands to the set top box through the remote control of the digital television or the menu button on the panel, for example, switching to the switching instruction of the target program A, and the set top box receives the switching instruction, wherein the target program A is plus Disturb the program.

In step 120, it is determined whether there is target authorization control information of the target program in the pre-stored authorization control information data.

Exemplarily, the set top box switches to the target program A in response to the received channel change command, and reads the program information (including the Transport ID, the Source ID, and the service ID) of the target program A from the database, and the pre-stored authorization according to the program information. The control information data is searched for whether there is target authorization control information of the target program A.

Entitlement Control Message (ECM) is private information of a Conditional Access (CA) system, including CW and private authorization information transmitted in a secure manner, applied to digital television.

In step 130, if yes, the target authorization control information is sent to the smart card, and the control word returned by the smart card is received.

Illustratively, when the target authorization control information of the target program A is found from the pre-stored authorization control information data, the target authorization control information is directly retrieved and the target authorization control information is sent to the smart card of the digital television, and the smart card receives the The target authorizes the control information and returns the current control word to the set top box.

In step 140, a descrambler is set according to the control word to descramble the target program.

When the digital television descrambling method provided by the embodiment includes the target authorization control information of the target program in the pre-stored authorization control information data, the control word may be directly extracted from the smart card according to the target authorization control information, and the descrambler is configured to solve the target program. The interference does not need to obtain the control word by acquiring the program map of the target program, parsing and filtering, etc., and the descrambling time when the digital TV is changed is reduced, and the fast descrambling is realized.

Embodiment 2

Please refer to FIG. 2. FIG. 2 is a schematic flow chart of a method for digital electrolytic disturbance provided by this embodiment. The difference between this embodiment and the first embodiment is that the content of the pre-stored authorization control information data is added, and an optional implementation manner is provided when it is determined that the pre-existing authorization control information data has no target authorization control information, and An optional implementation after the second descrambling.

In step 210, the authorization control information data is pre-stored.

Exemplarily, the authorization control information data may be sent by the front end, and the authorization control information data sent by the front end may include authorization control information of all programs at the current frequency point; or the authorization control information data sent by the front end may include the current frequency point and Authorization control information of all programs under adjacent frequency points; wherein the front end refers to a cable television room.

In step 220, a channel change command to switch to the target program is received.

In step 230, it is determined whether there is target authorization control information of the target program in the pre-stored authorization control information data.

Exemplarily, when there is the target authorization control information of the target program in the pre-stored authorization control information data, the process jumps to the following step 240; when there is no target authorization control information of the target program in the pre-stored authorization control information data, the jump Go to step 250 below.

In step 240, if yes, the target authorization control information is sent to the smart card, and the control word returned by the smart card is received.

Illustratively, after receiving the control word returned by the smart card, the set top box jumps to step 270 described below.

In step 250, if not, the program map of the target program is acquired from the front end and parsed, and the corresponding parsed data and packet identifier information are obtained.

Exemplarily, when there is no target authorization control information of the target program in the pre-stored authorization control information data, the set-top box acquires the program mapping table of the target program from the digital television front end, and parses the program mapping table. Get parsed data and packet identifier information.

In step 260, a filter is set according to the filtering parameter and the packet identifier information to filter the parsed data, the target authorization control information data is obtained and saved, the target authorization control information is retrieved from the target authorization control information data, and the control information is obtained from the smart card according to the target authorization. Extract the control word.

Exemplarily, since the authorization control information data changes once every preset time, the filter parameters of the filter are alternately changed, and the filter parameter of the authorization control information data is generally filtered by the filter to be 0x80 or 0x81, and the filter The filter parameters alternate between 0x80 and 0x81. For example, when the filter parameter of the filter is 0x80, when the new authorization control information data is received, the filter parameter of the filter needs to be modified to 0x81. The set top box filters the parsed data according to the filtering parameter and the packet identifier information setting filter, obtains the target authorization control information data including the target authorization control information, saves the target authorization control information data, and authorizes the control information data from the target. The target authorization control information is retrieved, the target authorization control information is sent to the smart card, and the control word returned by the smart card according to the target authorization control information is received.

In step 270, a descrambler is set according to the control word to descramble the target program.

In step 280, the process jumps to the above S260 every preset time period until the channel change command or the shutdown command is received again.

Exemplarily, the above steps 210-270 are the processing flow of the first descrambling of the set top box when the program is switched. Since the target program is a scrambled program, in order to realize the subsequent normal receiving signal to play the target program, the descrambling operation needs to be continued. The general control word contains a parity key. The control word changes every preset time. The target authorization control information of the corresponding target program also changes, for example, every 10 seconds. To achieve descrambling, every The above S260 is executed cyclically for 10 seconds until the channel change command is received again or the shutdown command is received to end the loop operation.

The target program in this embodiment refers to a scrambled program, and only the scrambled program needs to be descrambled, and the clear stream program can receive the signal normally without descrambling.

In summary, in the technical solution, the authorization control information data sent by the front end is pre-stored, and the set top box receives the switching instruction input by the user to switch to the target program, and the target authorization control information for the pre-stored authorization control information data with or without the target program. The two different situations are differently processed. When the target authorization control information of the target program is found from the pre-stored authorization control information data, the target authorization control information is retrieved and sent to the smart card, and the control word returned by the smart card is received. Setting a descrambler according to the control word, descrambling the target program, and subsequently continuing descrambling to ensure normal reception of the signal; and when there is no target authorization control information of the target program in the pre-stored authorization control information data, acquiring the target program from the front end The program mapping table is parsed, the corresponding parsing data and the packet identifier information are obtained, the target authorization control information is obtained according to the filtering parameter and the packet identifier information, and the control word is extracted from the smart card according to the target authorization control information to descramble the target program.

Embodiment 3

Please refer to FIG. 3. FIG. 3 is a schematic structural diagram of an apparatus for descrambling digital television provided by this embodiment.

The apparatus 300 for digital TV descrambling of this embodiment may include the following modules.

The channel change command receiving module 310 is configured to receive a channel change command for switching to the target program.

The determining module 320 is configured to determine whether there is target authorization control information of the target program in the pre-stored authorization control information data.

The control word extraction module 330 is configured to send the target authorization control information to the smart card and receive the control word returned by the smart card if the target authorization control information of the target program is included in the pre-stored authorization control information data.

The first descrambling module 340 is configured to set a descrambler according to the control word to descramble the target program.

In summary, in the technical solution, the set top box receives the switching instruction input by the user and switches to the target program, and when the target authorization control information of the target program is found from the pre-stored authorization control information data, the target authorization control information is retrieved. And send it to the smart card, receive the control word returned by the smart card, root According to the control word, a descrambler is disposed to descramble the target program; when the pre-stored authorization control information data includes the target authorization control information of the target program, the technical solution may directly extract the control word from the smart card according to the target authorization control information, and set The descrambler descrambles the target program, and does not need to obtain the control word by acquiring the program map of the target program, parsing and filtering, etc., and reducing the descrambling time when the digital TV is changed, taking advantage of less hardware resources. Fast descrambling.

Embodiment 4

Please refer to FIG. 4. FIG. 4 is a schematic structural diagram of an apparatus for descrambling digital television provided by this embodiment. The difference between this embodiment and the third embodiment is that the authorization control information data pre-storing module 410, the program mapping table parsing module 460, the second descrambling module 470, and the loop module 480 are added.

The apparatus 400 for digital TV descrambling of this embodiment may include the following modules.

The authorization control information data pre-storing module 410 is configured to pre-store the authorization control information data; wherein the authorization control information data includes authorization control information of all programs at the current frequency point; or the authorization control information data includes the current frequency point and adjacent frequency points. Authorization control information for all programs under.

The channel change command receiving module 420 is configured to receive a channel change command for switching to the target program.

The determining module 430 is configured to determine whether there is target authorization control information of the target program in the pre-stored authorization control information data.

The control word extraction module 440 is configured to send the target authorization control information to the smart card and receive the control word returned by the smart card if the target authorization control information of the target program is included in the pre-stored authorization control information data.

The first descrambling module 450 is configured to set a descrambler according to the control word to descramble the target program.

The program mapping table parsing module 460 is configured to obtain the program mapping table of the target program from the front end and parse the pre-stored authorization control information data without the target authorization control information of the target program, and obtain the corresponding parsing data and the packet identifier. information.

The second descrambling module 470 is configured to set a filter according to the filtering parameter and the packet identifier information to filter the parsed data, obtain and save the target authorization control information data, and retrieve the target authorization control information from the target authorization control information data, according to the target authorization. The control information extracts the control word from the smart card, sets the descrambler according to the control word, and descrambles the target program.

The loop module 480 is configured to cyclically start the second descrambling module 470 every preset time period until the channel change command or the shutdown command is received again.

In summary, in the technical solution, the pre-existing authorization control information data, the set-top box receives the user-switched switching instruction to the target program, and the target authorization control information for the pre-stored authorization control information data with or without the target program. Different situations are differently processed. When the target authorization control information of the target program is found from the pre-stored authorization control information data, the target authorization control information is retrieved and sent to the smart card, and the control word returned by the smart card is received, according to the control. The word set descrambler, descrambles the target program, and then continues descrambling to ensure normal reception of the signal; when there is no target authorization control information of the target program in the pre-stored authorization control information data, the program map of the target program is obtained from the front end And parsing, obtaining corresponding parsing data and packet identifier information, obtaining target authorization control information according to the filtering parameter and the packet identifier information, and extracting the control word from the smart card according to the target authorization control information to descramble the target program.

Embodiment 5

The embodiment provides a computer readable storage medium storing computer executable instructions for performing the above method of digital point descrambling.

FIG. 5 is a schematic diagram showing the hardware structure of a set top box according to the embodiment. As shown in FIG. 5, the set top box includes: one or more processors 510 and a memory 520. One processor 510 is taken as an example in FIG.

The set top box may further include: an input device 530 and an output device 540.

The processor 510, the memory 520, the input device 530, and the output device 540 in the set top box may be In connection with the bus or other means, the connection through the bus is taken as an example in FIG.

The input device 530 can receive input numeric or character information, and the output device 540 can include a display device such as a display screen.

The memory 520 is a computer readable storage medium that can be used to store software programs, computer executable programs, and modules. The processor 510 executes various functional applications and data processing by executing software programs, instructions, and modules stored in the memory 520 to implement any of the above embodiments.

The memory 520 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application required for at least one function. In addition, the memory may include volatile memory such as random access memory (RAM), and may also include non-volatile memory such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device.

Memory 520 can be a non-transitory computer storage medium or a transitory computer storage medium. The non-transitory computer storage medium, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, memory 520 can optionally include memory remotely located relative to processor 510, which can be connected to the set top box via a network. Examples of the above networks may include the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

Input device 530 can be used to receive input numeric or character information and to generate key signal inputs related to user settings and function control of the set top box. The output device 540 can include a display device such as a display screen.

The set top box of this embodiment may also include communication means 550 for transmitting and/or receiving information over a communication network.

Implementing all or part of the processes in the foregoing embodiment may be performed by a computer program executing related hardware, and the program may be stored in a non-transitory computer readable storage medium. The program, when executed, may include the flow of an embodiment of the method as described above, wherein the non-transitory computer readable storage medium may be a magnetic disk, an optical disk, a read only memory (ROM), or a random access memory (RAM). Wait.

Industrial applicability

The digital television descrambling method and apparatus provided by the present disclosure, when the target authorization control information of the target program is included in the pre-stored authorization control information data, may directly extract the control word from the smart card according to the target authorization control information, and set the descrambler to the target. The program descrambling does not need to obtain the control word by acquiring the program map of the target program, parsing and filtering, etc., and reduces the descrambling time when the digital TV is changed, and achieves fast descrambling when occupying less hardware resources.

Claims

A method for descrambling digital television, comprising:

Receiving a channel change instruction for switching to the target program;

Determining whether there is target authorization control information of the target program in the pre-stored authorization control information data;

And if the target authorization control information of the target program is included in the pre-stored authorization control information data, sending the target authorization control information to the smart card, and receiving the control word returned by the smart card;

A descrambler is provided according to the control word to descramble the target program.
The method of claim 1, wherein the receiving the switching to the target program before the switching instruction further comprises:

Pre-existing authorization control information data;

The authorization control information data includes authorization control information of all programs at a current frequency point.
The method of claim 1, wherein the receiving the switching to the target program before the switching instruction further comprises:

Pre-existing authorization control information data;

The authorization control information data includes authorization control information of all programs under the current frequency point and adjacent frequency points.
The method according to any one of claims 1-3, wherein, after determining whether the target authorization control information of the target program is included in the pre-stored authorization control information data, the method further includes:

If the target authorization control information of the target program is not included in the pre-stored authorization control information data, the program mapping table of the target program is acquired from the front end and parsed to obtain corresponding parsing data and packet identifier information;

Setting a filter according to the filter parameter and the package identifier information to filter the parsed data, obtaining target authorization control information data, and saving, and retrieving the target from the target authorization control information data And authorizing the control information, extracting a control word from the smart card according to the target authorization control information, and setting a descrambler according to the control word to descramble the target program.
The method of claim 4, wherein the setting a descrambler according to the control word, after descrambling the target program, further comprises:

Performing the filter according to the filter parameter and the packet identifier information to filter the parsed data every preset time period, obtaining target authorization control information data and saving, and retrieving the target authorization control information data from the target authorization control information data The target authorization control information extracts a control word from the smart card according to the target authorization control information, sets a descrambler, and descrambles the target program until the channel change command or the shutdown command is received again.
A digital television descrambling device includes:

a channel change command receiving module configured to receive a channel change command for switching to the target program;

The determining module is configured to determine whether the target authorization control information of the target program is included in the pre-stored authorization control information data;

a control word extraction module, configured to send the target authorization control information to the smart card, and receive the control word returned by the smart card, if it is determined that the pre-stored authorization control information data has the target authorization control information of the target program;

The first descrambling module is configured to set a descrambler according to the control word to descramble the target program.
The apparatus of claim 6 further comprising:

The authorization control information data pre-storing module is configured to pre-store the authorization control information data;

The authorization control information data includes authorization control information of all programs at a current frequency point.
The apparatus of claim 6 further comprising:

The authorization control information data pre-storing module is configured to pre-store the authorization control information data;

The authorization control information data includes all programs under the current frequency point and adjacent frequency points. Authorization control information.
The apparatus of any of claims 6-8, further comprising:

a program mapping table parsing module, configured to: when the target authorization control information of the target program is not included in the pre-stored authorization control information data, obtain a program mapping table of the target program from the front end and parse the data, and obtain corresponding parsing data and Packet identifier information;

a second descrambling module, configured to set a filter according to the filtering parameter and the packet identifier information to filter the parsed data, obtain target authorization control information data, and save, and retrieve the target from the target authorization control information data And authorizing the control information, extracting a control word from the smart card according to the target authorization control information, and setting a descrambler according to the control word to descramble the target program.
The apparatus of claim 9 further comprising:

The loop module is configured to cycle start the second descrambling module every preset time period until the channel change command or the shutdown command is received again.
A computer readable storage medium storing computer executable instructions for performing the method of any of claims 1-5.