CN103581751A - System and method for receiving digital television signals - Google Patents
System and method for receiving digital television signals Download PDFInfo
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- CN103581751A CN103581751A CN201310051025.XA CN201310051025A CN103581751A CN 103581751 A CN103581751 A CN 103581751A CN 201310051025 A CN201310051025 A CN 201310051025A CN 103581751 A CN103581751 A CN 103581751A
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- terminal
- gateway device
- program
- descrambling
- digital television
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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
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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
- H04N21/45—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]
Abstract
The invention discloses a system and method for receiving digital television signals. The method for receiving the digital television signals comprises the steps that a terminal enters a working state, authorization management information is received, the terminal reads a self program list, a user selects a program to be watched, the terminal sends a locked and selected program command to gateway equipment, the gateway equipment obtains and sends a table SI and authorization control information related to the selected program from radio-frequency signals of the television network to the terminal, the terminal analyzes the received table SI, the authorization control information and the authorization management information and obtains secrete data related to the descrambling of the selected program, the secrete data related to the descrambling of the selected program are sent to the gateway equipment, the gateway equipment decodes the received secrete data to obtain a secrete key used for descrambling the selected program, a program clear stream is obtained by utilizing the selected program descrambled through the secrete key, the program clear stream is sent to the terminal, and the terminal receives the program clear stream and decodes and plays the program clear stream. The system and method for receiving the digital television signals solve the problem that digital television programs can not be watched through equipment such as a computer, a mobile phone and a tablet computer.
Description
Technical field
The present invention relates to digital TV field, relate in particular to a kind of digital television signal receiving system and method for reseptance.
Background technology
Fast development along with network technology and chip technology, the equipment such as television set, computer, mobile phone, panel computer all possess network function, and the broadcasting video-audio program of can decoding, television set, computer, mobile phone and panel computer have become the Main Means that people receive video-audio program.Digital television program is as one of maximum video and audio content of audient, but, due to the special scrambling system of digital television system, only have and support the chip of digital television standard to watch digital television program by descrambling, therefore, only have digital television all-in-one or Set Top Box ability receiving digital television program, do not support computer chip, chip for cell phone and the dull and stereotyped computer chip of digital television standard cannot directly watch digital television program.In addition, along with the continuous upgrading of digital television techniques and chip technology, the old digital television chip of before producing also may cannot be watched digital television program because meeting the requirement of new Digital Television encryption and decryption technology.
Summary of the invention
Object of the present invention is exactly because of its master chip, not support digital television standard and cannot watch digital TV contents in order to solve the equipment such as current computer, mobile phone, panel computer, and old digital television chip requires to watch the problems such as digital television program because not meeting new Digital Television encryption and decryption technology, a kind of digital television signal receiving system and method for reseptance have been proposed, it makes computer, mobile phone, panel computer and adopts the equipment such as television set of old digital television chip in the situation that not revising hardware configuration, receiving digital television program.
To achieve these goals, the present invention adopts following technical scheme:
, it comprises:
S1: terminal enters operating state;
S2: terminal receives Entitlement Management Message EMM;
S3: terminal is obtained the rendition list in self;
S4: user selects the program that will watch in terminal;
S5: terminal sends the selected program order of locking to gateway device;
S6: gateway device obtains the SI relevant with selected program table and Entitlement Control Message ECM to terminal from the radiofrequency signal of Broadcasting Cable Network;
S7: SI table, Entitlement Control Message ECM and Entitlement Management Message EMM that terminal parses is received, obtain the secret data relevant with the selected program of descrambling;
S8: terminal sends the relevant secret data of the program selected with descrambling to gateway device;
S9: the secret data that gateway device deciphering is received, obtains the ciphering key W that the selected program of descrambling is used;
S10: gateway device utilizes the selected program of ciphering key W descrambling, obtains program clear stream;
S11: gateway device sends program clear stream to terminal;
S12: terminal program receiving clear stream, decoding broadcast program.
Before described step S2, also comprise, condition reception front end and terminal and gateway device carry out handshake communication, confirm the legitimacy of terminal and gateway device.
The step of described handshake communication is:
1) condition reception front end sends handshake data to terminal by IP network;
2) terminal parses handshake data obtains the verification msg of key and the encrypted form of encrypted form;
3) the terminal transmission key of encrypted form and the verification msg of encrypted form are to gateway device;
4) key of gateway device enabling decryption of encrypted form and the verification msg of encrypted form, obtain the verification msg of decrypted form;
5) verification msg that gateway device transmission deciphering obtains is to terminal;
6) verification msg that terminal transmission is received is to condition reception front end;
7) condition reception front end is according to the verification msg judgement terminal of receiving and the legitimacy of gateway device.
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 that receives to terminal by IP network;
(3) terminal parses handshake data obtains the verification msg of key and the encrypted form of encrypted form;
(4) the terminal transmission key of encrypted form and the verification msg of encrypted form are to gateway device;
(5) key of gateway device enabling decryption of encrypted form and the verification msg of encrypted form, obtain the verification msg of decrypted form;
(6) verification msg that gateway device transmission deciphering obtains is to condition reception front end;
(7) condition reception front end is according to the verification msg judgement terminal of receiving and the legitimacy of gateway device.
Described step S2 is specially, the Entitlement Management Message EMM that terminal condition of acceptance receiving front-end is sent by IP network; Or terminal receives the Entitlement Management Message EMM that gateway device obtains and sends from radiofrequency signal; Or terminal receives the Entitlement Management Message EMM that gateway device obtains from condition reception front end by IP network.
Described step S3 further comprises,
A) in terminal judges self, whether there is the rendition list, if exist, execution step b); If do not exist, execution 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, and sends to terminal from radiofrequency signal;
E) terminal parses 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 PAT, the PMT, the SDT that return to current locked frequency point show to terminal;
H) terminal parses PAT, PMT and SDT show, and obtain the programme information of current locked frequency point;
I) whether all frequencies in terminal judges radiofrequency signal all carried out lock operation, if so, performed step j); If not, execution step f);
J) programme information that preservation is obtained is in the memory of terminal.
Described step S11 is further: gateway device is used the public key encryption program clear stream of terminal, and the program clear stream after encrypting is sent to terminal;
Described step S12 is further: terminal receives the program clear stream of encrypting, and uses the program clear stream of the private key enabling decryption of encrypted of terminal, and the program clear stream that deciphering is obtained is decoded and plays.
Described terminal public key is when terminal and gateway device connect, and by terminal, sends to gateway device; The data of using described terminal public key to encrypt can be used the private key of described terminal to be decrypted.
Described terminal is carried out in the above-mentioned course of work, and terminal is regularly carried out described step S2.
Described SI table at least comprises a kind of in PAT, PMT, SDT, CAT table.
A receiving system, it comprises at least one gateway device, at least one terminal and at least one condition reception front end; Wherein,
Described gateway device at least comprises tuning demodulation module, demultiplexing module, deciphering module, descrambling module, processing unit and mixed-media network modules mixed-media, gateway device is connected by IP network is two-way with at least one terminal, the order that gateway device receiving terminal is sent, from Broadcasting Cable Network received RF signal, radiofrequency signal is carried out to tuning demodulation multiplexing, obtain program transport streams TS, the authorization message and the business information SI that at least comprise Entitlement Control Message ECM, gateway device transmission authorization message and SI information are to terminal, after receiving the secret data relevant with descrambling program that terminal sends, deciphering secret data obtains the ciphering key W of descrambling program, utilize ciphering key W deciphering program transport streams TS, and the program stream after descrambling is sent to terminal,
Described terminal sends order and controls gateway device work to gateway device, resolve the SI table that gateway device is sent, resolve Entitlement Control Message ECM and obtain the secret data relevant with the current program of descrambling with Entitlement Management Message EMM, and send to gateway device to be decrypted and descrambling operation secret data; Described terminal also receives the program stream that gateway device is sent, decoding broadcast program;
Described condition reception front end is connected by IP network is two-way with at least one terminal, and condition reception front end generates Entitlement Control Message ECM and delivers to Broadcasting Cable Network, generates Entitlement Management Message EMM and sends to terminal by Broadcasting Cable Network or IP network; Described condition reception front end also carries out handshake communication with terminal and gateway device, and the legitimacy of terminal and gateway device is verified.
A receiving system, it comprises at least one gateway device, at least one terminal and at least one condition reception front end; Wherein,
Described gateway device at least comprises tuning demodulation module, demultiplexing module, deciphering module, descrambling module, processing unit and mixed-media network modules mixed-media, gateway device is connected by IP network is two-way with at least one terminal, the order that gateway device receiving terminal is sent, from Broadcasting Cable Network received RF signal, radiofrequency signal is carried out to tuning demodulation multiplexing, obtain program transport streams TS, the authorization message and the business information SI that at least comprise Entitlement Control Message ECM, gateway device transmission authorization message and SI information are to terminal, after receiving the secret data relevant with descrambling program that terminal sends, deciphering secret data obtains the ciphering key W of descrambling program, utilize ciphering key W deciphering program transport streams TS, and the program stream after descrambling is sent to terminal,
Described terminal sends order and controls gateway device work to gateway device, resolve the SI table that gateway device is sent, resolve Entitlement Control Message ECM and obtain the secret data relevant with the current program of descrambling with Entitlement Management Message EMM, and send to gateway device to be decrypted and descrambling operation secret data; Described terminal also receives the program stream that gateway device is sent, decoding broadcast program;
Described condition reception front end is connected by IP network is two-way with at least one gateway device, condition reception front end generates Entitlement Control Message ECM and delivers to Broadcasting Cable Network, generates Entitlement Management Message EMM and is issued gateway device and then 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, and the legitimacy of terminal and gateway device is verified.
Described gateway device also comprises key production module, for the key that generates the key of deciphering secret data and generate the key of deciphering handshake data encrypted form.
Described gateway device also comprises encrypting module, for encrypting the program clear stream obtaining after descrambling.
Described terminal is at least a kind of in television set, computer, mobile phone and panel computer.
The invention has the beneficial effects as follows: the present invention is by gateway device receiving digital television signal from Broadcasting Cable Network, and according to the order of terminal, the program that locking will be watched, the ciphering key W that decrypt authorized information acquisition descrambling program is used, and utilize ciphering key W descrambling program transport streams, again the program transport streams after descrambling is sent to the terminal broadcasting of decoding, solved the computer of not supporting digital television standard, mobile phone, panel computer and the equipment such as television set that do not meet the old digital television chip of employing that Digital Television new technology requires cannot be watched the problem of digital television program in the situation that not changing hardware, implement simple and convenient, cost is low, and gateway device of the present invention is only responsible for the program stream after descrambling to send to terminal, and terminal is decoded and play, can effectively reduce the data volume size of transmitting between gateway device and terminal, reduced transfer of data taking bandwidth.In addition, the present invention also service condition receiving front-end verifies the legitimacy of terminal and gateway device, guarantees to only have legal terminal and gateway device just can watch digital television program, has guaranteed the interests of operator, safe.Visible, the present invention has the advantages such as enforcement is simple and convenient, the network bandwidth takies less, fail safe height.
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 charts;
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 is obtained the rendition list flow chart in terminal;
Fig. 9 is the method for the invention embodiment 3 flow charts.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a part of the present invention, and illustrated embodiment of the present invention and explanation thereof are used for explaining the present invention, does not form inappropriate limitation of the present invention.
As shown in Figure 1, digital television signal receiving system, it comprises at least one gateway device, at least one terminal and at least one condition reception front end; Wherein,
Described gateway device at least comprises tuning demodulation module, demultiplexing module, deciphering module and descrambling module, gateway device is connected by IP network is two-way with at least one terminal, the order that gateway device receiving terminal is sent, from Broadcasting Cable Network received RF signal, radiofrequency signal is carried out to tuning demodulation multiplexing, obtain program transport streams TS, the authorization message and the business information SI that at least comprise Entitlement Control Message ECM, gateway device transmission authorization message and SI information are to terminal, after receiving the secret data relevant with descrambling program that terminal sends, deciphering secret data obtains the ciphering key W of descrambling program, utilize ciphering key W deciphering program transport streams TS, and the program stream after descrambling is sent to terminal,
Described terminal sends order and controls gateway device work to gateway device, resolve the SI table that gateway device is sent, resolve Entitlement Control Message ECM and obtain the secret data relevant with the current program of descrambling with Entitlement Management Message EMM, and send to gateway device to be decrypted and descrambling operation secret data; Described terminal also receives the program stream that gateway device is sent, decoding broadcast program;
Described condition reception front end is connected with at least one terminal is two-way, and condition reception front end generates Entitlement Control Message ECM and delivers to Broadcasting Cable Network, generates Entitlement Management Message EMM and sends to terminal by Broadcasting Cable Network or IP network; Described condition reception front end also carries out handshake communication with terminal and gateway device, and the legitimacy of terminal and gateway device is verified.
Described terminal is television set, computer, mobile phone or panel computer.
As shown in Figure 2, digital television signal receiving system, it comprises at least one gateway device, at least one terminal and at least one condition reception front end; Wherein,
Described gateway device at least comprises tuning demodulation module, demultiplexing module, deciphering module and descrambling module, gateway device is connected by IP network is two-way with at least one terminal, the order that gateway device receiving terminal is sent, from Broadcasting Cable Network received RF signal, radiofrequency signal is carried out to tuning demodulation multiplexing, obtain program transport streams TS, the authorization message and the business information SI that at least comprise Entitlement Control Message ECM, gateway device transmission authorization message and SI information are to terminal, after receiving the secret data relevant with descrambling program that terminal sends, deciphering secret data obtains the ciphering key W of descrambling program, utilize ciphering key W deciphering program transport streams TS, and the program stream after descrambling is sent to terminal,
Described terminal sends order and controls gateway device work to gateway device, resolve the SI table that gateway device is sent, resolve Entitlement Control Message ECM and obtain the secret data relevant with the current program of descrambling with Entitlement Management Message EMM, and send to gateway device to be decrypted and descrambling operation secret data; Described terminal also receives the program stream that gateway device is sent, decoding broadcast program;
Described condition reception front end is connected by IP network is two-way with at least one gateway device, condition reception front end generates Entitlement Control Message ECM and delivers to Broadcasting Cable Network, generates Entitlement Management Message EMM and is issued gateway device and then 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, and the legitimacy of terminal and gateway device is verified.
As shown in Figure 3, described gateway device comprises tuning demodulation module, demultiplexing module, descrambling module, key production module, deciphering module, processing unit and mixed-media network modules mixed-media, wherein,
Tuning demodulation module is connected with demultiplexing module is unidirectional, and received RF digital television signal sends to demultiplexing module after tuning, demodulation;
Demultiplexing module is connected with descrambling module, and the digital television signal of demultiplexing module after to demodulation carries out demultiplexing, and authorization message and business information SI are sent to terminal, and program transport streams is sent to descrambling module;
Descrambling module is connected with deciphering module, the ciphering key W of the descrambling program that receiving and deciphering module is sent, and export program stream after descrambling to terminal;
Described descrambling module is connected with key production module, receives the required key of descrambling secret data that key production module produces, and the secret data that receiving terminal is sent simultaneously utilizes the secret key decryption secret data of receiving, obtains the required ciphering key W of descrambling program.
Described processing unit is connected with tuning demodulation module, demultiplexing module, descrambling module, key production module, deciphering module and encrypting module are two-way by bus, obtains the information of each module and each module is configured.
Described mixed-media network modules mixed-media is connected with demultiplexing module, descrambling module, deciphering module and encrypting module respectively, for realizing the data communication between gateway device and terminal equipment.
Described gateway device also comprises encrypting module, and encrypting module is connected with descrambling module, and the program data that descrambling module is sent is encrypted, and the program data after encrypting is sent to terminal.
Embodiment 1:
As shown in Figure 4, digital television signal receiving method, its step is:
S101: terminal enters operating state;
S102: condition reception front end and terminal are carried out handshake communication, the legitimacy of confirmation 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 the program that will watch in terminal;
S106: terminal sends the selected program order of locking to gateway device;
S107: gateway device obtains the SI relevant with selected program table and Entitlement Control Message ECM to terminal from the radiofrequency signal of Broadcasting Cable Network;
S108: SI table, Entitlement Control Message ECM and Entitlement Management Message EMM that terminal parses is received, obtain the secret data relevant with the selected program of descrambling;
S109: terminal sends the relevant secret data of the program selected with descrambling to gateway device;
S110: the secret data that gateway device deciphering is received, obtains the ciphering key W that the selected program of descrambling is used;
S111: gateway device utilizes the selected program of ciphering key W descrambling, obtains program clear stream;
S112: gateway device sends program clear stream to terminal;
S113: terminal program receiving clear stream, decoding broadcast program.
Embodiment 2:
As shown in Figure 5, digital television signal receiving method, its step is:
S201: terminal enters operating state;
S202: condition reception front end and terminal are carried out handshake communication, the legitimacy of confirmation terminal;
S203: gateway device obtains Entitlement Management Message EMM and sends to terminal from the radiofrequency signal of Broadcasting Cable Network;
S204: terminal reads the rendition list in self;
S205: user selects the program that will watch in terminal;
S206: terminal sends the selected program order of locking to gateway device;
S207: gateway device obtains the SI relevant with selected program table and Entitlement Control Message ECM to terminal from the radiofrequency signal of Broadcasting Cable Network;
S208: SI table, Entitlement Control Message ECM and Entitlement Management Message EMM that terminal parses is received, obtain the secret data relevant with the selected program of descrambling;
S209: terminal sends the relevant secret data of the program selected with descrambling to gateway device;
S210: the secret data that gateway device deciphering is received, obtains the ciphering key W that the selected program of descrambling is used;
S211: gateway device utilizes the selected program of ciphering key W descrambling, obtains program clear stream;
S212: gateway device is used the PKI of terminal to be encrypted program clear stream, and the program data after encrypting is sent to terminal;
S213: terminal receives the program data of encrypting, is used the program data of terminal secret key enabling decryption of encrypted, and the program data after deciphering is decoded and play.
Described terminal public key is when terminal and gateway device connect, and by terminal, sends to gateway device; The data of using described terminal public key to encrypt can be used the private key of described terminal to be decrypted.
As shown in Figure 6, described condition reception front end and terminal and gateway device carry out handshake communication flow process, and its step is:
1) condition reception front end sends handshake data to terminal by IP network;
2) terminal parses handshake data obtains the key EKey of encrypted form and the verification msg NONCE of encrypted form;
3) the terminal transmission key EKey of encrypted form and the verification msg NONCE of encrypted form are to gateway device;
4) the key EKey of gateway device enabling decryption of encrypted form, obtains key K ey;
5) gateway device utilizes Key as the verification msg NONCE of primary key enabling decryption of encrypted form, the verification msg after being deciphered;
6) verification msg that gateway device transmission deciphering obtains is to terminal;
7) verification msg that terminal transmission receives is to condition reception front end;
8) whether the verification msg that condition reception front end judgement is received is identical with the data of expection, if identical, terminal and gateway device legitimacy; Otherwise terminal and gateway device are illegal.
As shown in Figure 7, described condition reception front end and terminal and gateway device carry out handshake communication flow process, and its step is:
(1) condition reception front end sends handshake data to gateway device by IP network;
(2) gateway device sends the handshake data that receives to terminal by IP network;
(3) terminal parses handshake data obtains the verification msg of key and the encrypted form of encrypted form;
(4) the terminal transmission key of encrypted form and the verification msg of encrypted form are to gateway device;
(5) key of gateway device enabling decryption of encrypted form and the verification msg of encrypted form, obtain the verification msg of decrypted form;
(6) verification msg that gateway device transmission deciphering obtains is to condition reception front end;
(7) condition reception front end is according to the verification msg judgement terminal of receiving and the legitimacy of gateway device, if whether verification msg is identical with the data of expection, and terminal and gateway device legitimacy; Otherwise terminal and gateway device are illegal.
As shown in Figure 8, terminal is obtained the flow process of the rendition list in self, and its step is:
A) in terminal judges self, whether there is the rendition list, if exist, execution step b); If do not exist, execution 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, and sends to terminal from radiofrequency signal;
E) terminal parses 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 PAT, the PMT, the SDT that return to current locked frequency point show to terminal;
H) terminal parses PAT, PMT and SDT show, and obtain the programme information of current locked frequency point;
I) whether all frequencies in terminal judges radiofrequency signal all carried out lock operation, if so, performed step j); If not, execution step f);
J) programme information that preservation is obtained is in the memory of terminal.
Embodiment 3:
As shown in Figure 9, digital television signal receiving method, its step is:
S301: terminal enters operating state;
S302: condition reception front end and terminal are carried out handshake communication, the legitimacy of confirmation terminal;
S303: gateway device obtains Entitlement Management Message EMM and sends to terminal from the radiofrequency signal of Broadcasting Cable Network;
S304: terminal terminal reads the rendition list in self;
S305: user selects the program that will watch in terminal;
S306: the program that terminal parses user selects, obtains the programme information that at least comprises program place frequency, program video stream information and program audio stream information;
S307: terminal sends locked frequency point order to gateway device;
S308: gateway device is carried out locked frequency point operation, returns to locking frequency point state to terminal;
S309: terminal judges locking frequency point state, if lock successfully, execution step S310; If lock unsuccessfully, provide locked frequency point and unsuccessfully point out;
S310: terminal transmission configuration PID filter and Section filter order are to gateway device;
S311: gateway device arranges PID filter and Section filter, obtains CAT and EMM and returns to terminal;
S312: terminal parses EMM obtains authorization terminal information, if current program with no authorized provides prompting, waits for user's operation; If current program has mandate, perform step 313;
S313: terminal transmission configuration PID filter and Section filter order are to gateway device;
S314: gateway device arranges PID filter and Section filter, obtains PMT and sends to terminal;
S315: terminal parses PMT, judges that current program adds flow-disturbing or clear stream, if clear stream, execution step S316; If add flow-disturbing, execution 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 equipment;
S318: terminal equipment program receiving stream, decode and play;
S319: terminal transmission configuration PID filter and Section filter order are to gateway device;
S320: gateway device configuration PID filter and Section filter obtain Entitlement Control Message ECM, and ECM information are sent to terminal from radiofrequency signal;
S321: terminal parses ECM information, the ciphering key W Data Concurrent that obtains encrypted form is given gateway device;
S322: the key data relevant with the ciphering key W of enabling decryption of encrypted form that terminal transmission parsing EMM obtains is to gateway device;
S323: gateway device is deciphered the key that described key data obtains the ciphering key W of enabling decryption of encrypted form, and with the ciphering key W of this secret key decryption encrypted form, obtain the ciphering key W of descrambling program;
S324: gateway device is used ciphering key W descrambling program data, and the program data after descrambling is sent to terminal;
S325: terminal program receiving data, decoding broadcast program.
Above-mentioned is preferred embodiment of the present invention, and on the basis of technical scheme of the present invention, the various modifications of making or distortion still belong to protection scope of the present invention.
Claims (15)
1. a digital television signal receiving method, is characterized in that, it comprises:
S1: terminal enters operating state;
S2: terminal receives Entitlement Management Message EMM;
S3: terminal reads the rendition list in self;
S4: user selects the program that will watch in terminal;
S5: terminal sends the selected program order of locking to gateway device;
S6: gateway device obtains the SI relevant with selected program table and Entitlement Control Message ECM to terminal from the radiofrequency signal of Broadcasting Cable Network;
S7: SI table, Entitlement Control Message ECM and Entitlement Management Message EMM that terminal parses is received, obtain the secret data relevant with the selected program of descrambling;
S8: terminal sends the relevant secret data of the program selected with descrambling to gateway device;
S9: the secret data that gateway device deciphering is received, obtains the ciphering key W that the selected program of descrambling is used;
S10: gateway device utilizes the selected program of ciphering key W descrambling, obtains program clear stream;
S11: gateway device sends program clear stream to terminal;
S12: terminal program receiving clear stream, decoding broadcast program.
2. digital television signal receiving method as claimed in claim 1, is characterized in that, before described step S2, also comprises, condition reception front end and terminal and gateway device carry out handshake communication, confirms the legitimacy of terminal and gateway device.
3. digital television signal receiving method as claimed in claim 2, is characterized in that, the step of described handshake communication is:
1) condition reception front end sends handshake data to terminal by IP network;
2) terminal parses handshake data obtains the verification msg of key and the encrypted form of encrypted form;
3) the terminal transmission key of encrypted form and the verification msg of encrypted form are to gateway device;
4) key of gateway device enabling decryption of encrypted form and the verification msg of encrypted form, obtain the verification msg of decrypted form;
5) verification msg that gateway device transmission deciphering obtains is to terminal;
6) verification msg that terminal transmission is received is to condition reception front end;
7) condition reception front end is according to the verification msg judgement terminal of receiving and the legitimacy of gateway device.
4. digital television signal receiving method as claimed in claim 2, is characterized in that, 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 that receives to terminal by IP network;
3) terminal parses handshake data obtains the verification msg of key and the encrypted form of encrypted form;
4) the terminal transmission key of encrypted form and the verification msg of encrypted form are to gateway device;
5) key of gateway device enabling decryption of encrypted form and the verification msg of encrypted form, obtain the verification msg of decrypted form;
6) verification msg that gateway device transmission deciphering obtains is to condition reception front end;
7) condition reception front end is according to the verification msg judgement terminal of receiving and the legitimacy of gateway device.
5. digital television signal receiving method as claimed in claim 1, is characterized in that, described step S2 is specially, the Entitlement Management Message EMM that terminal condition of acceptance receiving front-end is sent by IP network; Or terminal receives the Entitlement Management Message EMM that gateway device obtains and sends from radiofrequency signal; Or terminal receives the Entitlement Management Message EMM that gateway device obtains from condition reception front end by IP network.
6. digital television signal receiving method as claimed in claim 1, is characterized in that, described step S3 further comprises,
A) in terminal judges self, whether there is the rendition list, if exist, execution step b); If do not exist, execution 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, and sends to terminal from radiofrequency signal;
E) terminal parses 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 PAT, the PMT, the SDT that return to current locked frequency point show to terminal;
H) terminal parses PAT, PMT and SDT show, and obtain the programme information of current locked frequency point;
I) whether all frequencies in terminal judges radiofrequency signal all carried out lock operation, if so, performed step j); If not, execution step f);
J) programme information that preservation is obtained is in the memory of terminal.
7. digital television signal receiving method as claimed in claim 1, is characterized in that, described step S11 is further: gateway device is used the public key encryption program clear stream of terminal, and the program clear stream after encrypting is sent to terminal;
Described step S12 is further: terminal receives the program clear stream of encrypting, and uses the program clear stream of the private key enabling decryption of encrypted of terminal, and the program clear stream that deciphering is obtained is decoded and plays.
8. digital television signal receiving method as claimed in claim 7, is characterized in that, described terminal public key is when terminal and gateway device connect, and by terminal, sends to gateway device; The data of using described terminal public key to encrypt can be used the private key of described terminal to be decrypted.
9. digital television signal receiving method as claimed in claim 1, is characterized in that, terminal is carried out in described procedure, and terminal is regularly carried out described step S2.
10. digital television signal receiving method as claimed in claim 1, is characterized in that, described SI table at least comprises a kind of in PAT, PMT, SDT, CAT table.
11. 1 kinds of digital television signal receiving systems, is characterized in that, it comprises at least one gateway device, at least one terminal and at least one condition reception front end; Wherein,
Described gateway device at least comprises tuning demodulation module, demultiplexing module, deciphering module, descrambling module, processing unit and mixed-media network modules mixed-media, gateway device is connected by IP network is two-way with at least one terminal, the order that gateway device receiving terminal is sent, from Broadcasting Cable Network received RF signal, radiofrequency signal is carried out to tuning demodulation multiplexing, obtain program transport streams TS, the authorization message and the business information SI that at least comprise Entitlement Control Message ECM, gateway device transmission authorization message and SI information are to terminal, after receiving the secret data relevant with descrambling program that terminal sends, deciphering secret data obtains the ciphering key W of descrambling program, utilize ciphering key W deciphering program transport streams TS, and the program stream after descrambling is sent to terminal,
Described terminal sends order and controls gateway device work to gateway device, resolve the SI table that gateway device is sent, resolve Entitlement Control Message ECM and obtain the secret data relevant with the current program of descrambling with Entitlement Management Message EMM, and send to gateway device to be decrypted and descrambling operation secret data; Described terminal also receives the program stream that gateway device is sent, decoding broadcast program;
Described condition reception front end is connected by IP network is two-way with at least one terminal, and condition reception front end generates Entitlement Control Message ECM and delivers to Broadcasting Cable Network, generates Entitlement Management Message EMM and sends to terminal by Broadcasting Cable Network or IP network; Described condition reception front end also carries out handshake communication with terminal and gateway device, and the legitimacy of terminal and gateway device is verified.
12. 1 kinds of digital television signal receiving systems, is characterized in that, it comprises at least one gateway device, at least one terminal and at least one condition reception front end; Wherein,
Described gateway device at least comprises tuning demodulation module, demultiplexing module, deciphering module, descrambling module, processing unit and mixed-media network modules mixed-media, gateway device is connected by IP network is two-way with at least one terminal, the order that gateway device receiving terminal is sent, from Broadcasting Cable Network received RF signal, radiofrequency signal is carried out to tuning demodulation multiplexing, obtain program transport streams TS, the authorization message and the business information SI that at least comprise Entitlement Control Message ECM, gateway device transmission authorization message and SI information are to terminal, after receiving the secret data relevant with descrambling program that terminal sends, deciphering secret data obtains the ciphering key W of descrambling program, utilize ciphering key W deciphering program transport streams TS, and the program stream after descrambling is sent to terminal,
Described terminal sends order and controls gateway device work to gateway device, resolve the SI table that gateway device is sent, resolve Entitlement Control Message ECM and obtain the secret data relevant with the current program of descrambling with Entitlement Management Message EMM, and send to gateway device to be decrypted and descrambling operation secret data; Described terminal also receives the program stream that gateway device is sent, decoding broadcast program;
Described condition reception front end is connected by IP network is two-way with at least one gateway device, condition reception front end generates Entitlement Control Message ECM and delivers to Broadcasting Cable Network, generates Entitlement Management Message EMM and is issued gateway device and then 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, and the legitimacy of terminal and gateway device is verified.
13. digital television signal receiving systems as described in claim 11 or 12, is characterized in that, described gateway device also comprises key production module, for the key that generates the key of deciphering secret data and generate the key of deciphering handshake data encrypted form.
14. digital television signal receiving systems as described in claim 11 or 12, is characterized in that, described gateway device also comprises encrypting module, for encrypting the program clear stream obtaining after descrambling.
15. digital television signal receiving systems as described in claim 11 or 12, is characterized in that, described terminal is at least a kind of in television set, computer, mobile phone and panel computer.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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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 |
| 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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| WO2014121652A1 (en) | 2014-08-14 |
| CN103581751B (en) | 2016-12-28 |
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