CN103581751B - A kind of digital television signal receives system and method for reseptance - Google Patents
A kind of digital television signal receives system and method for reseptance Download PDFInfo
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- CN103581751B CN103581751B CN201310051025.XA CN201310051025A CN103581751B CN 103581751 B CN103581751 B CN 103581751B CN 201310051025 A CN201310051025 A CN 201310051025A CN 103581751 B CN103581751 B CN 103581751B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4345—Extraction or processing of SI, e.g. extracting service information from an MPEG stream
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
- H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video stream decryption
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
- H04N21/4623—Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message]
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a kind of digital television signal and receive system and method for reseptance, including: terminal enters duty；Receive Entitlement Management Message；Terminal reads the rendition list in self；User selects program to be watched；Terminal sends the selected Interface Command of locking to gateway device；Gateway device obtains the SI table relevant with selected program and Entitlement Control Message to terminal from the radiofrequency signal of Broadcasting Cable Network；Terminal resolves SI table, Entitlement Control Message and the Entitlement Management Message received, it is thus achieved that the secret data that program selected with descrambling is relevant；Send the relevant secret data of the program selected with descrambling to gateway device；Gateway device deciphers the secret data received, it is thus achieved that the key that the selected program of descrambling uses；Utilize the program that key descrambling is selected, obtain program clear stream；Send program clear stream to terminal；Terminal receives program clear stream, decodes and plays.The present invention solves the problem that the equipment such as computer, mobile phone, panel computer cannot watch digital television program.
Description
Technical field
The present invention relates to digital TV field, particularly relate to a kind of digital television signal and receive system and method for reseptance.
Background technology
Along with network technology and the fast development of chip technology, the equipment such as television set, computer, mobile phone, panel computer is all
Possessing network function, and can decode broadcasting video-audio program, television set, computer, mobile phone and panel computer become
People receive the Main Means of video-audio program.Digital television program as one of most audio-visual content of audient, but, by
In the scrambling system that digital television system is special, only support that the chip of digital television standard could descramble and watch that DTV saves
Mesh, therefore, only digital television all-in-one or Set Top Box could receive digital television program, does not support digital television standard
Computer chip, chip for cell phone and flat board computer chip cannot directly watch digital television program.It addition, along with DTV
Technology and the continuous upgrading of chip technology, the old digital television chip before produced is likely to because meeting new numeral electricity
Digital television program cannot be watched depending on the requirement of encryption and decryption technology.
Summary of the invention
The purpose of the present invention is contemplated to solve the equipment such as current computer, mobile phone, panel computer and does not props up because of its master chip
Hold digital television standard and digital TV contents cannot be watched, and old digital television chip is because being unsatisfactory for new DTV
Encryption and decryption technology requires and cannot watch the problems such as digital television program, it is proposed that a kind of digital television signal receives system and connects
Receiving method, it makes the equipment such as computer, mobile phone, panel computer and the television set using old digital television chip not repair
In the case of changing hardware configuration, receive digital television program.
To achieve these goals, the present invention adopts the following technical scheme that
A kind of digital television signal receiving method, it includes:
S1: terminal enters duty；
S2: terminal receives Entitlement Management Message EMM；
S3: terminal obtains the rendition list in self；
S4: user selects program to be watched in terminal；
S5: terminal sends the selected Interface Command of locking to gateway device；
S6: gateway device obtains the SI table relevant with selected program and authorization control letter from the radiofrequency signal of Broadcasting Cable Network
Breath ECM is to terminal；
S7: terminal resolves SI table, Entitlement Control Message ECM and the Entitlement Management Message EMM received, it is thus achieved that selected with descrambling
The secret data that program is relevant；
S8: terminal sends the relevant secret data of the program selected with descrambling to gateway device；
S9: gateway device deciphers the secret data received, it is thus achieved that the ciphering key W that the selected program of descrambling uses；
S10: gateway device utilizes the program that ciphering key W descrambling is selected, obtains program clear stream；
S11: gateway device sends program clear stream to terminal；
S12: terminal receives program clear stream, decodes and plays program.
Also including before described step S2, condition reception front end carries out handshake communication with terminal and gateway device, confirms eventually
End and the legitimacy of gateway device.
The step of described handshake communication is:
1) condition reception front end sends handshake data to terminal by IP network；
2) terminal parsing handshake data obtains the key of encrypted form and the checking data of encrypted form；
3) terminal sends the key of encrypted form and the checking data of encrypted form to gateway device；
4) gateway device deciphers key and the checking data of encrypted form of encrypted form, obtains the checking number of decrypted form
According to；
5) gateway device sends and deciphers the checking data obtained to terminal；
6) terminal sends the checking data received to condition reception front end；
7) condition reception front end judges the legitimacy of terminal and gateway device according to the checking data received.
Further, the step of described handshake communication is:
(1) condition reception front end sends handshake data to gateway device by IP network；
(2) gateway device sends the handshake data received to terminal by IP network；
(3) terminal parsing handshake data obtains the key of encrypted form and the checking data of encrypted form；
(4) terminal sends the key of encrypted form and the checking data of encrypted form to gateway device；
(5) gateway device deciphers key and the checking data of encrypted form of encrypted form, obtains the checking of decrypted form
Data；
(6) gateway device sends and deciphers the checking data obtained to condition reception front end；
(7) condition reception front end judges the legitimacy of terminal and gateway device according to the checking data received.
Described step S2 is specifically, the Entitlement Management Message EMM that sent by IP network of terminal condition of acceptance receiving front-end；Or
Person's terminal receives the Entitlement Management Message EMM that gateway device obtains from radiofrequency signal and sends；Or terminal receives gateway and sets
The standby Entitlement Management Message EMM obtained from condition reception front end by IP network.
Described step S3 farther includes,
A) whether terminal judges self existing the rendition list, if existing, performing step b)；If not existing, perform step
C)；
B) terminal reads the program information data of self and resolves；
C) terminal sends locking dominant frequency dot command to gateway device；
D) gateway device locking dominant frequency point, obtains NIT table from radiofrequency signal, and is sent to terminal；
E) terminal resolves NIT table, obtains the frequency point information in radiofrequency signal；
F) terminal sends locked frequency point order to gateway device；
G) gateway device locks corresponding frequency according to the order that receives, and return the PAT of Current lock frequency, PMT,
SDT table is to terminal；
H) terminal resolves PAT, PMT and SDT table, obtains the programme information of Current lock frequency；
I) whether all frequencies in terminal judges radiofrequency signal were carried out lock operation, if so, performed step j)；If
No, perform step f)；
J) programme information obtained is preserved in the memorizer of terminal.
Described step S11 is further: gateway device uses the public key encryption program clear stream of terminal, and by the joint after encryption
Mesh clear stream is sent to terminal；
Described step S12 is further: terminal receives the program clear stream of encryption, deciphers the program of encryption with the private key of terminal
Clear stream, the program clear stream obtaining deciphering is decoded and plays.
Described terminal public key is when terminal is connected with gateway device foundation, terminal be sent to gateway device；Use
The data of described terminal public key encryption can use the private key of described terminal to be decrypted.
Described terminal carries out in above-mentioned work process, and terminal is periodically executed described step S2.
Described SI table at least includes the one in PAT, PMT, SDT, CAT table.
A kind of digital television signal receives system, and it includes at least one gateway device, at least one terminal and at least one
Individual condition reception front end；Wherein,
Described gateway device at least includes tuning demodulation module, demultiplexing module, deciphering module, descrambling module, process list
Unit and mixed-media network modules mixed-media, gateway device is bi-directionally connected by IP network with at least one terminal, and gateway device receives the life that terminal is sent
Order, receives radiofrequency signal from Broadcasting Cable Network, is tuned radiofrequency signal solving harmonic solution multiplexing, obtains program transport streams TS, at least
Comprising authorization message and business information SI of Entitlement Control Message ECM, gateway device sends authorization message and SI information to terminal,
After receiving the secret data relevant with descrambled program that terminal is sent, deciphering secret data obtains the key of descrambled program
CW, utilizes ciphering key W to decipher program transport streams TS, and the program stream after descrambling is sent to terminal；
Described terminal sends commands to gateway device and controls gateway device work, resolves the SI table that gateway device is sent, solves
Analysis Entitlement Control Message ECM and Entitlement Management Message EMM obtains the secret data relevant with descrambling actual program, and by secret number
It is decrypted and descrambling operation according to being sent to gateway device；Described terminal also receives the program stream that gateway device is sent, and decoding is also
Play program；
Described condition reception front end is bi-directionally connected by IP network with at least one terminal, and condition reception front end generates and authorizes control
Information ECM processed also delivers to Broadcasting Cable Network, generates Entitlement Management Message EMM and is sent to terminal by Broadcasting Cable Network or IP network；Described
Condition reception front end also carries out handshake communication with terminal and gateway device, verifies the legitimacy of terminal and gateway device.
A kind of digital television signal receives system, and it includes at least one gateway device, at least one terminal and at least one
Individual condition reception front end；Wherein,
Described gateway device at least includes tuning demodulation module, demultiplexing module, deciphering module, descrambling module, process list
Unit and mixed-media network modules mixed-media, gateway device is bi-directionally connected by IP network with at least one terminal, and gateway device receives the life that terminal is sent
Order, receives radiofrequency signal from Broadcasting Cable Network, is tuned radiofrequency signal solving harmonic solution multiplexing, obtains program transport streams TS, at least
Comprising authorization message and business information SI of Entitlement Control Message ECM, gateway device sends authorization message and SI information to terminal,
After receiving the secret data relevant with descrambled program that terminal is sent, deciphering secret data obtains the key of descrambled program
CW, utilizes ciphering key W to decipher program transport streams TS, and the program stream after descrambling is sent to terminal；
Described terminal sends commands to gateway device and controls gateway device work, resolves the SI table that gateway device is sent, solves
Analysis Entitlement Control Message ECM and Entitlement Management Message EMM obtains the secret data relevant with descrambling actual program, and by secret number
It is decrypted and descrambling operation according to being sent to gateway device；Described terminal also receives the program stream that gateway device is sent, and decoding is also
Play program；
Described condition reception front end is bi-directionally connected by IP network with at least one gateway device, and condition reception front end generates and awards
Power control information ECM also delivers to Broadcasting Cable Network, generates Entitlement Management Message EMM and issues gateway device by Broadcasting Cable Network or IP network and enter
And it is sent to terminal；Described condition reception front end also carries out handshake communication with terminal and gateway device, to terminal and gateway device
Legitimacy verify.
Described gateway device also includes key production module, for generating the key of deciphering secret data and generating deciphering
The key of the key of encrypted form in handshake data.
Described gateway device also includes encrypting module, the program clear stream obtained after encrypting descrambling.
Described terminal is at least the one in television set, computer, mobile phone and panel computer.
The invention has the beneficial effects as follows: the present invention receives digital television signal, and root by gateway device from Broadcasting Cable Network
According to the order of terminal, locking program to be watched, deciphering authorization message obtains the ciphering key W of descrambled program, and utilizes ciphering key W
Descrambled program transmission stream, then will descrambling after program transport streams be sent to terminal be decoded play, solve and do not support numeral
The computer of television standard, mobile phone, panel computer and be unsatisfactory for that DTV new technique requires use old DTV
The equipment such as the television set of chip cannot watch the problem of digital television program in the case of not changing hardware, implements simple side
Just, low cost；And the program stream after gateway device of the present invention is only responsible for descrambling is sent to terminal, and terminal is decoded and broadcasts
Put, can effectively reduce the data volume size of transmission between gateway device and terminal, reduce data transmission and bandwidth is taken.
It addition, the present invention also uses condition reception front end to verify the legitimacy of terminal and gateway device, it is ensured that the most legal
Terminal and gateway device just can watch digital television program, it is ensured that the interests of operator, and safety is high.Visible, the present invention has
Have enforcement simple and convenient, the network bandwidth takies less, safety advantages of higher.
Accompanying drawing explanation
Fig. 1 is the structural representation of system of the present invention；
Fig. 2 is another structural representation of system of the present invention；
Fig. 3 is gateway device structural representation in system of the present invention；
Fig. 4 is the method for the invention embodiment 1 flow chart；
Fig. 5 is the method for the invention embodiment 2 flow chart；
Fig. 6 is condition reception front end of the present invention and terminal and gateway device handshake communication flow chart；
Fig. 7 is condition reception front end of the present invention and terminal and another flow chart of gateway device handshake communication；
Fig. 8 is that terminal of the present invention obtains the rendition list flow chart in terminal；
Fig. 9 is the method for the invention embodiment 3 flow chart.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the present invention, this
Bright illustrated embodiment and explanation thereof are used for explaining the present invention, are not intended that inappropriate limitation of the present invention.
As it is shown in figure 1, digital television signal receive system, it include at least one gateway device, at least one terminal and
At least one condition reception front end；Wherein,
Described gateway device at least includes tuning demodulation module, demultiplexing module, deciphering module and descrambling module, and gateway sets
For being bi-directionally connected by IP network with at least one terminal, gateway device receives the order that terminal is sent, and receives radio frequency from Broadcasting Cable Network
Signal, is tuned radiofrequency signal solving harmonic solution multiplexing, obtains program transport streams TS, including at least Entitlement Control Message ECM
Authorization message and business information SI, gateway device sends authorization message and SI information to terminal, is receiving what terminal was sent
After the secret data relevant with descrambled program, deciphering secret data obtains the ciphering key W of descrambled program, utilizes ciphering key W deciphering joint
Program transport stream TS, and the program stream after descrambling is sent to terminal；
Described terminal sends commands to gateway device and controls gateway device work, resolves the SI table that gateway device is sent, solves
Analysis Entitlement Control Message ECM and Entitlement Management Message EMM obtains the secret data relevant with descrambling actual program, and by secret number
It is decrypted and descrambling operation according to being sent to gateway device；Described terminal also receives the program stream that gateway device is sent, and decoding is also
Play program；
Described condition reception front end is bi-directionally connected with at least one terminal, and condition reception front end generates Entitlement Control Message
ECM also delivers to Broadcasting Cable Network, generates Entitlement Management Message EMM and is sent to terminal by Broadcasting Cable Network or IP network；Described condition connects
Receive front end and also carry out handshake communication with terminal and gateway device, the legitimacy of terminal and gateway device is verified.
Described terminal is television set, computer, mobile phone or panel computer.
As in figure 2 it is shown, digital television signal receive system, it include at least one gateway device, at least one terminal and
At least one condition reception front end；Wherein,
Described gateway device at least includes tuning demodulation module, demultiplexing module, deciphering module and descrambling module, and gateway sets
For being bi-directionally connected by IP network with at least one terminal, gateway device receives the order that terminal is sent, and receives radio frequency from Broadcasting Cable Network
Signal, is tuned radiofrequency signal solving harmonic solution multiplexing, obtains program transport streams TS, including at least Entitlement Control Message ECM
Authorization message and business information SI, gateway device sends authorization message and SI information to terminal, is receiving what terminal was sent
After the secret data relevant with descrambled program, deciphering secret data obtains the ciphering key W of descrambled program, utilizes ciphering key W deciphering joint
Program transport stream TS, and the program stream after descrambling is sent to terminal；
Described terminal sends commands to gateway device and controls gateway device work, resolves the SI table that gateway device is sent, solves
Analysis Entitlement Control Message ECM and Entitlement Management Message EMM obtains the secret data relevant with descrambling actual program, and by secret number
It is decrypted and descrambling operation according to being sent to gateway device；Described terminal also receives the program stream that gateway device is sent, and decoding is also
Play program；
Described condition reception front end is bi-directionally connected by IP network with at least one gateway device, and condition reception front end generates and awards
Power control information ECM also delivers to Broadcasting Cable Network, generates Entitlement Management Message EMM and issues gateway device by Broadcasting Cable Network or IP network and enter
And it is sent to terminal；Described condition reception front end also carries out handshake communication with terminal and gateway device, to terminal and gateway device
Legitimacy verify.
As it is shown on figure 3, described gateway device includes tuning demodulation module, demultiplexing module, descrambling module, key generation mould
Block, deciphering module, processing unit and mixed-media network modules mixed-media, wherein,
Demodulation module is unidirectional with demultiplexing module is connected in tuning, receives RF digital TV signal, tune, demodulate after transmission
To demultiplexing module；
Demultiplexing module is connected with descrambling module, and the digital television signal after demodulation is demultiplexed by demultiplexing module,
Authorization message and business information SI are sent to terminal, program transport streams is sent to descrambling module；
Descrambling module is connected with deciphering module, the ciphering key W of the descrambled program that receiving and deciphering module is sent, and exports descrambling
After program stream to terminal；
Described descrambling module is connected with key production module, needed for receiving the descrambling secret data that key production module produces
Key, receive the secret data sent of terminal simultaneously, utilize the secret key decryption secret data received, needed for obtaining descrambled program
Ciphering key W.
Described processing unit by bus with tuning demodulation module, demultiplexing module, descrambling module, key production module,
Deciphering module and encrypting module are bi-directionally connected, and obtain the information of each module and configure each module.
Described mixed-media network modules mixed-media is connected with demultiplexing module, descrambling module, deciphering module and encrypting module respectively, is used for realizing
Data communication between gateway device and terminal unit.
Described gateway device also includes encrypting module, and encrypting module is connected with descrambling module, the joint sending descrambling module
Mesh data are encrypted, and the program data after encryption is sent to terminal.
Embodiment 1:
As shown in Figure 4, digital television signal receiving method, its step is:
S101: terminal enters duty；
S102: condition reception front end and terminal carry out handshake communication, confirm the legitimacy of terminal；
S103: the Entitlement Management Message EMM that terminal condition of acceptance receiving front-end is sent；
S104: terminal reads the rendition list in self；
S105: user selects program to be watched in terminal；
S106: terminal sends the selected Interface Command of locking to gateway device；
S107: gateway device obtains the SI table relevant with selected program and authorization control from the radiofrequency signal of Broadcasting Cable Network
Information ECM is to terminal；
S108: terminal resolves SI table, Entitlement Control Message ECM and the Entitlement Management Message EMM received, it is thus achieved that with descrambling choosing
Determine the secret data that program is relevant；
S109: terminal sends the relevant secret data of the program selected with descrambling to gateway device；
S110: gateway device deciphers the secret data received, it is thus achieved that the ciphering key W that the selected program of descrambling uses；
S111: gateway device utilizes the program that ciphering key W descrambling is selected, obtains program clear stream；
S112: gateway device sends program clear stream to terminal；
S113: terminal receives program clear stream, decodes and plays program.
Embodiment 2:
As it is shown in figure 5, digital television signal receiving method, its step is:
S201: terminal enters duty；
S202: condition reception front end and terminal carry out handshake communication, confirm the legitimacy of terminal；
S203: gateway device obtains Entitlement Management Message EMM from the radiofrequency signal of Broadcasting Cable Network and is sent to terminal；
S204: terminal reads the rendition list in self；
S205: user selects program to be watched in terminal；
S206: terminal sends the selected Interface Command of locking to gateway device；
S207: gateway device obtains the SI table relevant with selected program and authorization control from the radiofrequency signal of Broadcasting Cable Network
Information ECM is to terminal；
S208: terminal resolves SI table, Entitlement Control Message ECM and the Entitlement Management Message EMM received, it is thus achieved that with descrambling choosing
Determine the secret data that program is relevant；
S209: terminal sends the relevant secret data of the program selected with descrambling to gateway device；
S210: gateway device deciphers the secret data received, it is thus achieved that the ciphering key W that the selected program of descrambling uses；
S211: gateway device utilizes the program that ciphering key W descrambling is selected, obtains program clear stream；
S212: gateway device uses the PKI of terminal to be encrypted program clear stream, and is sent out by the program data after encryption
Give terminal；
S213: terminal receives the program data of encryption, uses the program data of terminal secret key deciphering encryption, after deciphering
Program data is decoded and plays.
Described terminal public key is when terminal is connected with gateway device foundation, terminal be sent to gateway device；Use
The data of described terminal public key encryption can use the private key of described terminal to be decrypted.
As shown in Figure 6, described condition reception front end carries out handshake communication flow process with terminal and gateway device, its step
For:
1) condition reception front end sends handshake data to terminal by IP network；
2) terminal parsing handshake data obtains the key EKey of encrypted form and checking data NONCE of encrypted form；
3) terminal sends the key EKey of encrypted form and checking data NONCE of encrypted form to gateway device；
4) the key EKey of gateway device deciphering encrypted form, obtains key Key；
5) gateway device utilizes Key to decipher checking data NONCE of encrypted form as primary key, after being deciphered
Checking data；
6) gateway device sends and deciphers the checking data obtained to terminal；
7) terminal sends the checking data received to condition reception front end；
8) condition reception front end judges that the checking data that receive are the most identical with intended data, if identical, then terminal and
Gateway device legitimacy；Otherwise, terminal and gateway device are illegal.
As it is shown in fig. 7, described condition reception front end carries out handshake communication flow process with terminal and gateway device, its step
For:
(1) condition reception front end sends handshake data to gateway device by IP network；
(2) gateway device sends the handshake data received to terminal by IP network；
(3) terminal parsing handshake data obtains the key of encrypted form and the checking data of encrypted form；
(4) terminal sends the key of encrypted form and the checking data of encrypted form to gateway device；
(5) gateway device deciphers key and the checking data of encrypted form of encrypted form, obtains the checking of decrypted form
Data；
(6) gateway device sends and deciphers the checking data obtained to condition reception front end；
(7) condition reception front end judges the legitimacy of terminal and gateway device according to the checking data received, if checking number
According to the most identical with intended data, then terminal and gateway device legitimacy；Otherwise, terminal and gateway device are illegal.
As shown in Figure 8, terminal obtains the flow process of the rendition list in self, and its step is:
A) whether terminal judges self existing the rendition list, if existing, performing step b)；If not existing, perform step
C)；
B) terminal reads the program information data of self and resolves；
C) terminal sends locking dominant frequency dot command to gateway device；
D) gateway device locking dominant frequency point, obtains NIT table from radiofrequency signal, and is sent to terminal；
E) terminal resolves NIT table, obtains the frequency point information in radiofrequency signal；
F) terminal sends locked frequency point order to gateway device；
G) gateway device locks corresponding frequency according to the order that receives, and return the PAT of Current lock frequency, PMT,
SDT table is to terminal；
H) terminal resolves PAT, PMT and SDT table, obtains the programme information of Current lock frequency；
I) whether all frequencies in terminal judges radiofrequency signal were carried out lock operation, if so, performed step j)；If
No, perform step f)；
J) programme information obtained is preserved in the memorizer of terminal.
Embodiment 3:
As it is shown in figure 9, digital television signal receiving method, its step is:
S301: terminal enters duty；
S302: condition reception front end and terminal carry out handshake communication, confirm the legitimacy of terminal；
S303: gateway device obtains Entitlement Management Message EMM from the radiofrequency signal of Broadcasting Cable Network and is sent to terminal；
S304: terminal reads the rendition list in self；
S305: user selects program to be watched in terminal；
S306: terminal resolve user select program, it is thus achieved that including at least program place frequency, program video stream information and
The programme information of program audio stream information；
S307: terminal sends locked frequency point order to gateway device；
S308: gateway device performs locked frequency point operation, returns locking frequency point state to terminal；
S309: terminal judges locking frequency point state, if locking successfully, performs step S310；If locking unsuccessfully, provide lock
Determine frequency unsuccessfully to point out；
S310: terminal sends configuration PID filter and Section filter order to gateway device；
S311: gateway device arranges PID filter and Section filter, obtains CAT and EMM and returns to terminal；
S312: terminal resolves EMM and obtains authorization terminal information, if actual program with no authorized, provides prompting, waits user
Operation；If actual program has mandate, perform step 313；
S313: terminal sends configuration PID filter and Section filter order to gateway device；
S314: gateway device arranges PID filter and Section filter, obtains PMT and is sent to terminal；
S315: terminal resolves PMT, it is judged that actual program adds flow-disturbing or clear stream, if clear stream, performs step S316；
If adding flow-disturbing, perform step S319；
S316: terminal sends configuration PID filter order to gateway device；
S317: gateway device configuration PID filter, and program stream is sent to terminal unit；
S318: terminal unit receives program stream, decodes and plays；
S319: terminal sends configuration PID filter and Section filter order to gateway device；
S320: gateway device configuration PID filter and Section filter, obtains authorization control from radiofrequency signal
Information ECM, and ECM information is sent to terminal；
S321: terminal resolves ECM information, obtains the ciphering key W data of encrypted form and is sent to gateway device；
S322: terminal send resolve that EMM obtains with deciphering encrypted form relevant for ciphering key W key data to gateway
Equipment；
S323: gateway device is deciphered described key data and is obtained deciphering the key of the ciphering key W of encrypted form, and close with this
The ciphering key W of key deciphering encrypted form obtains the ciphering key W of descrambled program；
S324: gateway device uses ciphering key W descrambled program data, and the program data after descrambling is sent to terminal；
S325: terminal receives program data, decodes and plays program.
The above-mentioned preferred embodiment for the present invention, on the basis of technical scheme, the various amendments made or
Deformation still falls within protection scope of the present invention.
Claims (8)
1. a digital television signal receiving method, is characterized in that, it includes:
S1: terminal enters duty；
S2: terminal receives Entitlement Management Message EMM；
S3: terminal reads the rendition list in self；
S4: user selects program to be watched in terminal；
S5: terminal sends the selected Interface Command of locking to gateway device；
S6: gateway device obtains the SI table relevant with selected program and Entitlement Control Message from the radiofrequency signal of Broadcasting Cable Network
ECM is to terminal；
S7: terminal resolves SI table, Entitlement Control Message ECM and the Entitlement Management Message EMM received, it is thus achieved that program selected with descrambling
Relevant secret data；
S8: terminal sends the relevant secret data of the program selected with descrambling to gateway device；
S9: gateway device deciphers the secret data received, it is thus achieved that the ciphering key W that the selected program of descrambling uses；
S10: gateway device utilizes the program that ciphering key W descrambling is selected, obtains program clear stream；
S11: gateway device sends program clear stream to terminal；
S12: terminal receives program clear stream, decodes and plays program；
Also including before described step S2, condition reception front end and terminal and gateway device carry out handshake communication, confirm terminal and
The legitimacy of gateway device；
The step of described handshake communication is:
1) condition reception front end sends handshake data to terminal by IP network；
2) terminal parsing handshake data obtains the key of encrypted form and the checking data of encrypted form；
3) terminal sends the key of encrypted form and the checking data of encrypted form to gateway device；
4) gateway device deciphers key and the checking data of encrypted form of encrypted form, obtains the checking data of decrypted form；
5) gateway device sends and deciphers the checking data obtained to terminal；
6) terminal sends the checking data received to condition reception front end；
7) condition reception front end judges the legitimacy of terminal and gateway device according to the checking data received.
2. a digital television signal receiving method, is characterized in that, it includes:
S1: terminal enters duty；
S2: terminal receives Entitlement Management Message EMM；
S3: terminal reads the rendition list in self；
S4: user selects program to be watched in terminal；
S5: terminal sends the selected Interface Command of locking to gateway device；
S6: gateway device obtains the SI table relevant with selected program and Entitlement Control Message from the radiofrequency signal of Broadcasting Cable Network
ECM is to terminal；
S7: terminal resolves SI table, Entitlement Control Message ECM and the Entitlement Management Message EMM received, it is thus achieved that program selected with descrambling
Relevant secret data；
S8: terminal sends the relevant secret data of the program selected with descrambling to gateway device；
S9: gateway device deciphers the secret data received, it is thus achieved that the ciphering key W that the selected program of descrambling uses；
S10: gateway device utilizes the program that ciphering key W descrambling is selected, obtains program clear stream；
S11: gateway device sends program clear stream to terminal；
S12: terminal receives program clear stream, decodes and plays program；
Also including before described step S2, condition reception front end and terminal and gateway device carry out handshake communication, confirm terminal and
The legitimacy of gateway device；
The step of described handshake communication is:
1) condition reception front end sends handshake data to gateway device by IP network；
2) gateway device sends the handshake data received to terminal by IP network；
3) terminal parsing handshake data obtains the key of encrypted form and the checking data of encrypted form；
4) terminal sends the key of encrypted form and the checking data of encrypted form to gateway device；
5) gateway device deciphers key and the checking data of encrypted form of encrypted form, obtains the checking data of decrypted form；
6) gateway device sends and deciphers the checking data obtained to condition reception front end；
7) condition reception front end judges the legitimacy of terminal and gateway device according to the checking data received.
3. digital television signal receiving method as claimed in claim 1 or 2, is characterized in that, described step S2 is specifically, terminal
The Entitlement Management Message EMM that condition of acceptance receiving front-end is sent by IP network；Or terminal receives gateway device from radiofrequency signal
Middle acquisition the Entitlement Management Message EMM sent；Or terminal is received gateway device and is obtained from condition reception front end by IP network
Entitlement Management Message EMM.
4. digital television signal receiving method as claimed in claim 1 or 2, is characterized in that, described step S3 farther includes,
A) whether terminal judges self existing the rendition list, if existing, performing step b)；If not existing, perform step c)；
B) terminal reads the program information data of self and resolves；
C) terminal sends locking dominant frequency dot command to gateway device；
D) gateway device locking dominant frequency point, obtains NIT table from radiofrequency signal, and is sent to terminal；
E) terminal resolves NIT table, obtains the frequency point information in radiofrequency signal；
F) terminal sends locked frequency point order to gateway device；
G) gateway device locks corresponding frequency according to the order received, and returns PAT, PMT, SDT of Current lock frequency
Table is to terminal；
H) terminal resolves PAT, PMT and SDT table, obtains the programme information of Current lock frequency；
I) whether all frequencies in terminal judges radiofrequency signal were carried out lock operation, if so, performed step j)；If it is not,
Perform step f)；
J) programme information obtained is preserved in the memorizer of terminal.
5. digital television signal receiving method as claimed in claim 1 or 2, is characterized in that, described step S11 is further:
Gateway device uses the public key encryption program clear stream of terminal, and the program clear stream after encryption is sent to terminal；
Described step S12 is further: terminal receives the program clear stream of encryption, and the program deciphering encryption with the private key of terminal is clear
Stream, the program clear stream obtaining deciphering is decoded and plays.
6. digital television signal receiving method as claimed in claim 5, is characterized in that, described terminal public key is at terminal and net
Pass equipment is set up when connecting, terminal be sent to gateway device；The data using described terminal public key to encrypt can use institute
The private key stating terminal is decrypted.
7. digital television signal receiving method as claimed in claim 1 or 2, is characterized in that, terminal performs described procedure
In, terminal is periodically executed described step S2.
8. digital television signal receiving method as claimed in claim 1 or 2, is characterized in that, described SI table at least include PAT,
One in PMT, SDT, CAT table.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310051025.XA CN103581751B (en) | 2013-02-08 | 2013-02-08 | A kind of digital television signal receives system and method for reseptance |
| PCT/CN2014/000086 WO2014121652A1 (en) | 2013-02-08 | 2014-01-23 | Digital television signal receiving system and receiving method |
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| CN201310051025.XA CN103581751B (en) | 2013-02-08 | 2013-02-08 | A kind of digital television signal receives system and method for reseptance |
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| CN103581751B true CN103581751B (en) | 2016-12-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104038814A (en) * | 2014-06-19 | 2014-09-10 | 四川长虹电器股份有限公司 | Quick program filtering method for digital televisions |
| CN105791954B (en) * | 2014-12-23 | 2019-02-01 | 深圳Tcl新技术有限公司 | Digital TV terminal condition receiving method, terminal and system |
| CN104506925A (en) * | 2015-01-08 | 2015-04-08 | 大唐微电子技术有限公司 | Multimedia gateway and method |
| CN107257505A (en) * | 2016-09-19 | 2017-10-17 | 深圳创维数字技术有限公司 | A kind of method and system for preventing front end from changing digital television program code stream privately |
| CN106713977B (en) * | 2016-12-22 | 2020-01-14 | 深圳Tcl数字技术有限公司 | Network playing method and device |
| CN109275004A (en) * | 2018-11-07 | 2019-01-25 | 深圳Tcl数字技术有限公司 | Digital television signal de-scrambling method, mobile terminal, system and storage medium |
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| CN103581751A (en) | 2014-02-12 |
| WO2014121652A1 (en) | 2014-08-14 |
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