Program remote scrambling system and framework

Abstract

The utility model discloses a program remote scrambling system and framework. The program remote scrambling system comprises a master station scrambling server which is connected with the input end of a master station broadcasting multiplexer, the output end of the master station broadcasting multiplexer is connected with one end of a first type switch, and the other end of the first type switch is connected with one end of a first type optical transceiver. The other end of the first type optical transceiver is connected with the regional broadcast multiplexer in each program transmitting system through an optical link; the main station scrambling server is used for scrambling the received program information to obtain scrambled information and sending the scrambled information to the main station broadcasting multiplexer; and the main station broadcast multiplexer is used for adding the scrambling information to each information table of the PSI / SI to form a corresponding TS stream, and transmitting the TS stream to the regional broadcast multiplexer of each program transmitting system through an optical link. According to the utility model, the operation and maintenance difficulty of integral broadcasting is reduced, the signal safety and transmission stability of the program remote scrambling system are ensured, and the safe broadcasting is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of digital television, in particular to a program remote scrambling system and architecture. Background Art

[0002] Digital TV terrestrial program scrambling is the basic structure of the wireless radio and television broadcasting system. Each district and county has its own wireless radio and television programs. The traditional scrambling mode is to first transmit the audio and video programs back to the front-end machine room of the main station, and then scramble the audio and video programs uniformly in the front-end machine room of the main station, and then transmit them to the district and county TV stations through optical cables. This not only wastes bandwidth resources, but also increases the pressure of front-end operation and maintenance. Utility Model Content

[0003] The utility model provides a program remote scrambling system and architecture to solve the technical problems of bandwidth resource waste and increased front-end operation and maintenance pressure in the prior art.

[0004] According to one aspect of the utility model, a program remote scrambling system is provided, comprising: a central station scrambling server, a central station broadcast multiplexer, a first type switch and a first type optical terminal; wherein the central station scrambling server is connected to the input end of the central station broadcast multiplexer, the output end of the central station broadcast multiplexer is connected to one end of the first type switch, the other end of the first type switch is connected to one end of the first type optical terminal, and the other end of the first type optical terminal is connected to the regional broadcast multiplexer in each program transmission system through an optical link;

[0005] The central station scrambling server is used to scramble the received program information, obtain scrambling information, and send it to the central station broadcast multiplexer;

[0006] The main station broadcast multiplexer is used to add the scrambling information to each information table of program-specific information and service information to form a corresponding transmission format TS stream;

[0007] The first type of switch is used to adjust the flow of the electrical signal corresponding to the TS stream;

[0008] The first type of optical terminal is used to convert the electrical signal corresponding to the TS stream into a corresponding optical signal, and transmit the TS stream to the regional broadcast multiplexer of each program transmission system through an optical link, so that the regional broadcast multiplexer can perform PID mapping on the scrambling information of the local station in the TS stream and the audio and video of the local station, and then multiplex and forward it to the transmitter.

[0009] In one embodiment, the program transmission system includes: a second type optical terminal, a second type switch, a regional broadcast multiplexer and a transmitter;

[0010] The second type of optical terminal is connected to the first type of optical terminal, the other end of the second type of optical terminal is connected to one end of the second type of switch, the other end of the second type of switch is connected to one end of the regional broadcast multiplexer, and the other end of the regional broadcast multiplexer is connected to the transmitter;

[0011] The second type optical terminal is used to receive the TS stream transmitted by the first type optical terminal, convert the TS stream from an optical signal to a corresponding electrical signal, and send it to the corresponding second type switch;

[0012] The second type switch is used to adjust the flow of the electrical signal and send it to the corresponding regional broadcast multiplexer;

[0013] The regional broadcast multiplexer maps the local audio and video with the local scrambling information in the TS stream and then multiplexes and forwards it to the transmitter;

[0014] The transmitter is used to transmit the audio and video of this station to the corresponding set-top box for program broadcasting.

[0015] In one embodiment, the program remote scrambling system adopts a waterfall system to transmit the scrambling information to each regional broadcast multiplexer in the program transmission system via an optical link.

[0016] In one embodiment, the first type of switch and the first type of optical transceiver included in the program remote scrambling system both correspond one-to-one to the external program transmission system.

[0017] In one embodiment, the first type of optical terminal and the second type of optical terminal have the characteristics of performance consistency, signal matching and signal synchronization.

[0018] In one embodiment, the program information includes at least one of the following: program name, program number, and program type.

[0019] In one embodiment, the regional playout multiplexer is also used for PID filtering, PID mapping, PCR correction, PSI / SI extraction, PSI / SI insertion and PSI / SI modification.

[0020] In one embodiment, the program transmission system includes a second type switch and a second type optical terminal.

[0021] In one embodiment, the optical link comprises one of the following: an optical fiber and an optical cable.

[0022] According to another aspect of the utility model, a program remote scrambling architecture is provided, comprising: a program transmission system, and a program remote scrambling system as described in any of the above embodiments; wherein the program remote scrambling system is connected to the program transmission system via an optical link;

[0023] The program remote scrambling system transmits the TS stream formed by the central station broadcast multiplexer in the program remote scrambling system to the regional broadcast multiplexer in each of the program transmission systems through an optical link; the regional broadcast multiplexer PID maps the scrambling information of the station in the TS stream with the audio and video of the station and then multiplexes and forwards it to the transmitter.

[0024] The technical solution of the embodiment of the utility model only needs to configure the central station scrambling server, the central station broadcast multiplexer, the first type switch and the first type optical terminal in the program remote scrambling system, and pre-edit the program information that needs to be scrambled through the central station scrambling server to obtain the corresponding scrambling information, and add the scrambling information to each information table of the program-specific information and service information through the central station broadcast multiplexer to form a corresponding TS stream, and transmit the TS stream to the regional broadcast multiplexer of each program transmission system through the optical link formed by the first type switch and the first type optical terminal, so that the regional broadcast multiplexer PID maps the scrambling information of the station in the TS stream with the audio and video of the station and then multiplexes and forwards it to the transmitter, thereby realizing remote scrambling of the station's program, avoiding the repeated construction of scrambling equipment in different district and county TV stations, and avoiding the technical problem of exponentially increased operation and maintenance difficulty, operation and maintenance cost and hardware cost caused by not sending the audio and video programs of each district and county TV station to the central station, thereby reducing bandwidth resources, and reducing operation and maintenance pressures such as operation and maintenance difficulty, operation and maintenance cost and hardware cost.

[0025] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a structural block diagram of a traditional digital television terrestrial program remote scrambling system provided by the prior art;

[0028] Figure 2It is a structural block diagram of a program remote scrambling system provided by an embodiment of the utility model;

[0029] Figure 3 It is a structural block diagram of a program transmission system provided by an embodiment of the utility model;

[0030] Figure 4 It is a structural block diagram of a program remote scrambling architecture provided by an embodiment of the utility model;

[0031] Figure 5 It is a structural block diagram of another program remote scrambling architecture provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] Figure 1 This is a block diagram of a traditional digital TV terrestrial program remote scrambling system provided by the prior art. Figure 1 As shown, the traditional digital television terrestrial program remote scrambling system at least includes a signal aggregation input switch and a signal aggregation output switch.

[0035] Since the digital TV program audio and video are remotely transmitted and delivered between the front-end machine room of the main station and the regional front-end machine rooms (for example, the front-end machine room in location A, the front-end machine room in location B, and the front-end machine room in location C), they are affected by many factors such as switches, optical terminals, and optical links, and signal interruptions caused by optical signals often occur. Once the network transmission rate is unstable or the optical cable is damaged, the program broadcast will be affected by poor broadcast or suspension. In addition, traditional audio and video require a large number of network devices during remote transmission and delivery, and the performance requirements of the switches are relatively high, which not only increases the difficulty of operation and maintenance, but also increases the operation and maintenance costs and equipment procurement costs exponentially.

[0036] In view of this, this practical embodiment proposes a remote scrambling system for programs, which only sends the scrambling information to each district and county TV station, and each district and county TV station multiplexes and broadcasts the scrambling information of the station through the local broadcast multiplexer, which reduces the frequency of remote bandwidth usage and the rate requirement for the network. Compared with the traditional digital TV terrestrial program remote scrambling system, it can reduce the use of redundant equipment and reduce the difficulty of operation and maintenance. Both hardware cost and safe broadcasting have been significantly improved compared with the traditional mode.

[0037] In addition, the front-end machine room of the main station transmits the digital TV scrambling information to the district and county TV stations through the network. The set-top box will store the received scrambling information and digital TV PSI table. Network connection is only required when authorization is required. Therefore, the stability of network transmission will not affect program viewing.

[0038] In one embodiment, Figure 2 This is a structural block diagram of a program remote scrambling system provided by an embodiment of the utility model. This embodiment is applicable to the situation of remote scrambling of digital television terrestrial programs in different regions. The program remote scrambling system can be implemented in the form of hardware. In this embodiment, there are two program transmission systems connected to the program remote scrambling system. Correspondingly, the number of the first type of switches and the first type of optical terminals included in the program remote scrambling system are both two. Figure 2 As shown, the program remote scrambling system 10 includes: a central station scrambling server 110, a central station broadcast multiplexer 120, a first type switch 130 and a first type optical terminal 140; wherein the central station scrambling server 110 is connected to the input end of the central station broadcast multiplexer 120, the output end of the central station broadcast multiplexer 120 is connected to one end of the first type switch 130, the other end of the first type switch 130 is connected to one end of the first type optical terminal 140, and the other end of the first type optical terminal 140 is connected to the regional broadcast multiplexer 210 in each program transmission system 20 through an optical link;

[0039] The central station scrambling server 110 is used to scramble the received program information, obtain scrambled information, and send it to the central station broadcast multiplexer 120;

[0040] The main station broadcast multiplexer 120 is used to add the scrambling information to each information table of the program-specific information and the service information to form a corresponding transport format (Transport Stream, TS) stream;

[0041] The first type switch 130 is used to adjust the flow of the electrical signal corresponding to the TS flow;

[0042] The first type of optical terminal 140 is used to convert the electrical signal corresponding to the TS stream into a corresponding optical signal, and transmit the TS stream to the regional broadcast multiplexer 210 of each program transmission system 20 through an optical link, so that the regional broadcast multiplexer 210 maps the local station's scrambling information in the TS stream with the local station's audio and video packet identification code (Packet Identifier, PID) and then multiplexes and forwards it to the transmitter 220.

[0043] In one example, each program transmission system 20 corresponds to a regional front-end machine room one by one, and a regional front-end machine room corresponds to a district and county TV station one by one. Of course, the program transmission system can also be understood as a regional front-end machine room. Each district and county TV station sends the program information that needs to be scrambled to the main station through data transmission methods such as written form or email. In one example, program specific information (PSI) and service information (SI) can be understood as PSI / SI of the digital video broadcasting (DVB) standard. Correspondingly, the information table can be understood as each information table in the DVB standard PSI / SI. Exemplarily, the information table may include but is not limited to: Conditional Access Table (CAT), Program Association Table (PAT), Program Map Table (PMT), Service Description Table (SDT) and each program audio and video PID. Among them, CAT may include Entitlement Management Messages (EMM) and Entitlement Control Messages (ECM). In one example, TS stream refers to a transmission format of digital television signals. TS stream can encapsulate multiple audio, video and subtitle components together, and can be transmitted through transmission media such as satellite and cable TV networks. The central broadcast multiplexer 120 transmits the corresponding TS stream from each information table to the regional broadcast multiplexer 210 of each program transmission system 20. The regional broadcast multiplexer 210 parses and processes EMM and ECM according to the information contained in the CAT table in the TS stream to determine whether the district and county TV station corresponding to the program transmission system 20 has the right to access the encrypted content, and performs decryption and decoding operations.

[0044] In the embodiment, the central station scrambling server 110 in the program remote scrambling system 10 plans the required PID according to the needs of each district and county TV station, and scrambles the received program information to obtain the corresponding scrambling information, and sends it to the central station broadcast multiplexer 120, and adds the scrambling information of each district and county TV station to each information table of the DVB standard through the central station broadcast multiplexer 120 to form a corresponding TS stream. The central station broadcast multiplexer 120 sends the TS stream in the form of an electrical signal to the first type switch 130, and the first type switch 130 controls the flow of the electrical signal corresponding to the TS stream to ensure the stable transmission of the electrical signal, and sends the TS stream in the form of an electrical signal to the first type optical terminal 140, and converts the TS stream from an electrical signal to an optical signal through the first type optical terminal 140, and sends it to the regional broadcast multiplexer 210 of each program transmission system 20 through an optical link.

[0045] The technical solution of this embodiment only needs to configure the central station scrambling server, the central station broadcast multiplexer, the first type switch and the first type optical terminal in the program remote scrambling system, and pre-edit the program information that needs to be scrambled through the central station scrambling server to obtain the corresponding scrambling information, and add the scrambling information to each information table of the program-specific information and service information through the central station broadcast multiplexer to form a corresponding TS stream, and transmit the TS stream to the regional broadcast multiplexer of each program transmission system through the optical link formed by the first type switch and the first type optical terminal, so that the regional broadcast multiplexer PID maps the scrambling information of the station in the TS stream with the audio and video of the station and then multiplexes and forwards it to the transmitter, thereby realizing remote scrambling of the station's program, avoiding the repeated construction of scrambling equipment in different district and county TV stations, and avoiding the technical problem of exponentially increased operation and maintenance difficulty, operation and maintenance cost and hardware cost caused by not sending the audio and video programs of each district and county TV station to the central station, thereby reducing bandwidth resources, and reducing operation and maintenance pressures such as operation and maintenance difficulty, operation and maintenance cost and hardware cost.

[0046] In one embodiment, Figure 3 1 is a structural block diagram of a program transmission system provided by an embodiment of the utility model. Figure 3 As shown, the program transmission system 20 in the embodiment of the utility model includes: a second type optical terminal 240, a second type switch 230, a regional broadcast multiplexer 210 and a transmitter 220;

[0047] The second type optical terminal 240 is connected to the first type optical terminal 140, the other end of the second type optical terminal 240 is connected to one end of the second type switch 230, the other end of the second type switch 230 is connected to one end of the regional broadcast multiplexer 210, and the other end of the regional broadcast multiplexer 210 is connected to the transmitter 220;

[0048] The second type optical terminal 240 is used to receive the TS stream transmitted by the first type optical terminal 140, and convert the TS stream from an optical signal to a corresponding electrical signal, and send it to the corresponding second type switch 230;

[0049] The second type switch 230 is used to adjust the flow of the electrical signal and send it to the corresponding regional broadcast multiplexer;

[0050] The regional broadcast multiplexer 210 maps the local audio and video with the local scrambling information in the TS stream and then multiplexes and forwards it to the transmitter 220;

[0051] The transmitter 220 is used to transmit the audio and video of the station to the corresponding set-top box for program broadcasting.

[0052] In one example, each program transmission system 20 includes a second type optical terminal 240 and a second type switch 230. Each program transmission system 20 corresponds to a district or county TV station. Generally speaking, the scrambling information of the station corresponding to each program transmission system 20 is different. In an embodiment, the TS stream transmitted by the program remote scrambling system 10 can be received by the second type optical terminal 240 in the program transmission system 20, and the scrambling information of the station in the TS stream is mapped and multiplexed with the audio and video of the station through the regional broadcast multiplexer. Among them, the re-multiplexed content may include: PAT, PMT, CAT, SDT, program PID and ECM PID contained in the program, and then the audio and video PID of the station is mapped to the planned program PID, and finally the multiplexed TS stream is forwarded to the transmitter 220 in the output port of the regional broadcast multiplexer 210 for broadcasting, so that all set-top boxes associated with the transmitter 220 receive the corresponding program and broadcast and watch it.

[0053] The technical solution of this embodiment can realize customized scrambling of programs of TV stations in different regions by sending the pre-edited program information to the main station, and scrambling and adding information tables through the main station scrambling server and the main station broadcast multiplexer, thereby reducing the reuse of scrambling equipment in TV stations in different regions and improving the efficiency of equipment use. At the same time, the audio and video sources of TV stations in different regions are stored in the corresponding regional TV stations, and multiplexed with the program PID of this station through the regional broadcast multiplexer, so that the safe broadcast guarantee work can be completed in each district and county TV station, thereby solving the network security problem caused by long-distance transmission of audio and video.

[0054] In one embodiment, the program remote scrambling system adopts a waterfall system to transmit the scrambling information to the regional broadcast multiplexer in each program transmission system through an optical link. The waterfall system can be understood as one program remote scrambling system corresponding to multiple program transmission systems. Accordingly, the program remote scrambling system can be transmitted to the regional broadcast multiplexers in multiple program transmission systems through an optical link. Generally speaking, each program transmission system includes a regional broadcast multiplexer.

[0055] In one embodiment, the first type of switches and the first type of optical terminals included in the program remote scrambling system correspond one-to-one with the external program transmission system. The number of the first type of switches included in the program remote scrambling system is equal to the number of the external program transmission systems, and the number of the first type of single units is equal to the number of the external program transmission systems. Correspondingly, the number of the first type of switches is equal to the number of the first type of optical terminals, that is, there is a one-to-one correspondence between the first type of switches and the first type of optical terminals. In one example, the scrambling information of the program transmission systems corresponding to different district and county TV stations can be split through the main station broadcast multiplexer, and the scrambling information of the station can be transmitted through the first type of switches and the first type of optical terminals corresponding to each program transmission system itself, so as to reduce the occupation of bandwidth resources. Alternatively, the scrambling information of the program transmission systems corresponding to all district and county TV stations can be directly sent to the regional broadcast multiplexer of each program transmission system through the main station broadcast multiplexer, and then the scrambling information of the station corresponding to the audio and video of the station can be searched from all the scrambling information through the regional broadcast multiplexer, and the scrambling information of the station can be PID mapped with the audio and video of the station and then multiplexed to reduce the data processing amount of the main station broadcast multiplexer in the program remote scrambling system.

[0056] In one embodiment, the first type of optical terminal and the second type of optical terminal have the characteristics of performance consistency, signal matching and signal synchronization. The first type of optical terminal and the second type of optical terminal in the program remote scrambling system appear and are configured in pairs, and the two need to have the characteristics of performance consistency to ensure the normal transmission of optical signals; and need to have the characteristics of signal matching to ensure the accurate transmission of optical signals; and need to have the characteristics of signal synchronization to avoid distortion or loss of optical signals.

[0057] In one embodiment, the program information includes at least one of the following: program name, program quantity and program type. The program type may include but is not limited to: news, variety shows, documentaries, children's programs and sports, etc. The program name is used to represent the unique identifier of different TV programs; the program quantity is used to represent the total amount of TV programs that can be broadcast by each district and county TV station.

[0058] In one embodiment, the regional broadcast multiplexer is also used for PID filtering, PID mapping, PCR correction, PSI / SI extraction, PSI / SI insertion and PSI / SI modification. In one example, the regional broadcast multiplexer in each program transmission system can filter out data packets that are not related to the audio and video of the station, that is, only retain data packets of specific PIDs related to the audio and video of the station, thereby reducing redundant data in the TS stream and improving data transmission efficiency. In one example, the regional broadcast multiplexer in each program transmission system can map the audio and video PID in the TS stream to the output PID to reorganize the program structure, add or delete programs, and perform operations such as encryption and decryption on the program. In one example, the regional broadcast multiplexer in each program transmission system can also use the system clock to re-identify the program clock reference (Program Clock Reference, PCR) to ensure the synchronization of each program in time and avoid time deviation or picture jitter. In one example, the regional broadcast multiplexer in each program transmission system can also filter out the elementary stream ES from the received TS stream and extract PSI / SI information. In one example, the regional broadcast multiplexer in each program transmission system can also insert local PSI / SI information so that the set-top box as the receiving end can accurately identify and process the information related to the audio and video of this station. In one example, the regional broadcast multiplexer in each program transmission system can also modify the extracted PSI / SI information, such as changing the program name, channel number, service provider information, etc., so as to meet different business needs and user interface displays. In addition, the regional broadcast multiplexer in each program transmission system can also support the insertion and editing functions of private descriptors.

[0059] In one embodiment, the program transmission system includes a second type switch and a second type optical terminal. Generally speaking, the program transmission system includes a second type switch and a second type optical terminal. It is only necessary to convert the received TS stream from the optical signal to the electrical signal through the second type optical terminal, and control the flow of the electrical signal through the second type switch to stabilize the electrical signal.

[0060] In one embodiment, the optical link includes one of the following: an optical fiber and an optical cable. Generally speaking, since the TS stream contains an information table of scrambling information corresponding to each program information, that is, the data transmission volume is small, the TS stream can be transmitted by optical fiber between the first type optical terminal and the second type optical terminal. Of course, an optical cable composed of multiple optical fibers can also be used to transmit the TS stream between the first type optical terminal and the second type optical terminal to ensure more reliable connection and protection.

[0061] In one embodiment, Figure 4This is a structural block diagram of a program remote scrambling architecture provided by an embodiment of the utility model. Figure 4 As shown, the program remote scrambling architecture includes: a program transmission system 20, and a program remote scrambling system 10 as described in any of the above embodiments; wherein the program remote scrambling system 10 is connected to the program transmission system 20 via an optical link;

[0062] The program remote scrambling system 10 transmits the TS stream formed by the central station broadcast multiplexer 120 in the program remote scrambling system 10 to the regional broadcast multiplexer 210 in each program transmission system 20 through an optical link; the regional broadcast multiplexer 210 performs PID mapping on the scrambling information of the station in the TS stream and the audio and video of the station, and then multiplexes and forwards it to the transmitter 220.

[0063] The technical solution of this embodiment is to pre-edit the program information that needs to be scrambled through the program remote scrambling system, and form the corresponding TS stream through the main station broadcast multiplexer, and then transmit it to the corresponding program transmission system of each district and county TV station via the transmission link, so that the regional broadcast multiplexer in the program transmission system can perform PID mapping and multiplexing based on the scrambling information of the station in the TS stream and the audio and video of the station, thereby realizing remote scrambling of programs of multiple district and county TV stations, avoiding repeated construction of scrambling equipment in different locations, reducing the hardware cost in the program transmission system, and improving the control of program scrambling of district and county TV stations. At the same time, since the program remote scrambling system only needs to scramble and transmit the program information, the overall broadcast operation and maintenance difficulty is reduced, and the signal security and transmission stability of the program remote scrambling system can be guaranteed to a greater extent, as well as safe broadcasting.

[0064] In one embodiment, Figure 5 This is a structural block diagram of another program remote scrambling architecture provided by an embodiment of the utility model. This embodiment is based on the above embodiment, with the program remote scrambling system as the front-end machine room of the main station, the program transmission system as the regional front-end machine room, the second type of switch including: A-site switch, B-site switch and C-site switch, the second type of optical terminal including: optical terminal receiving end A, optical terminal receiving end B and optical terminal receiving end C, and the regional broadcast multiplexer including: A-site broadcast multiplexer, B-site broadcast multiplexer and C-site broadcast multiplexer as an example, to illustrate the structure of program remote scrambling.

[0065] like Figure 5As shown, the program remote scrambling architecture in this embodiment includes: a central station front-end machine room and regional front-end machine rooms (respectively, the front-end machine room in site A, the front-end machine room in site B, and the front-end machine room in site C); wherein, the central station front-end machine room includes: a central station scrambling server, a central station broadcast multiplexer, three first-type switches (respectively, switch A, switch B, and switch C), and three first-type optical terminals (respectively, optical terminal output terminal A, optical terminal output terminal B, and optical terminal output terminal C); the front-end machine room in site A includes: an optical terminal receiving terminal A, a site switch, a broadcast multiplexer in site A, and a transmitter in site A; the front-end machine room in site B includes: an optical terminal receiving terminal B, a site switch, a broadcast multiplexer in site B, and a transmitter in site B; the front-end machine room in site C includes: an optical terminal receiving terminal C, a site switch, a broadcast multiplexer in site C, and a transmitter in site C.

[0066] In an embodiment, the central station scrambling server scrambles the program name, program quantity and program type that need to be scrambled to obtain corresponding scrambling information; then the central station broadcast multiplexer adds the scrambling information to the various tables of the DVB standard PSI / SI, such as CAT's EMM and ECM, PAT, PMT, SDT and each program's audio and video PID, to form a DVB standard TS stream, and sends the TS stream to the optical terminal receiving terminal A through switch A and optical terminal input terminal A, and sends the TS stream to the optical terminal receiving terminal B through switch B and optical terminal input terminal B, and sends the TS stream to the optical terminal receiving terminal C through switch C and optical terminal input terminal C. Then, the TS stream transmitted from the remote end is received through the optical terminal receiving end A, and the TS stream containing the program information of this station is re-multiplexed through the broadcast multiplexer at A. The re-multiplexed content includes: PAT, PMT, CAT, SDT, program PID and ECMPID contained in the program. Then, the audio and video PID of this station is mapped to the planned program PID. Finally, the multiplexed TS stream is forwarded to the transmitter at A for broadcast in the output port of the multiplexer; the TS stream transmitted from the remote end is received through the optical terminal receiving end B, and the TS stream containing the program information of this station is re-multiplexed through the broadcast multiplexer at B. The re-multiplexed content includes: PAT, PMT, CAT, SDT, program PID and ECM contained in the program PID, and then map the audio and video PID of this station to the planned program PID, and finally forward the multiplexed TS stream to the transmitter at B for broadcast in the multiplexer output port; and receive the TS stream transmitted from the remote end through the optical terminal receiving end C, and re-multiplex the TS stream containing the program information of this station through the broadcast multiplexer at C. The re-multiplexed content includes: PAT, PMT, CAT, SDT, program PID and ECMPID contained in the program, and then map the audio and video PID of this station to the planned program PID, and finally forward the multiplexed TS stream to the transmitter at C for broadcast in the multiplexer output port.

[0067] By scrambling the pre-edited program information in the front-end machine room of the main station and transmitting the scrambled information to the front-end machine rooms in each region remotely, customized scrambling of programs in different regions can be achieved, thereby reducing the reuse of equipment and improving the efficiency of equipment use. At the same time, the audio and video sources are placed in each district and county TV station, and multiplexed with the program PID through the regional broadcast multiplexer, which solves the network security problem caused by long-distance transmission, and the safe broadcast guarantee work can be completed in each district and county TV station.

[0068] It should be noted that the scrambling method in the embodiment of the utility model can use the existing program scrambling method to scramble the program information.

[0069] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0070] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A program remote scrambling system, characterized in that: include: A central station scrambling server, a central station broadcast multiplexer, a first type switch and a first type optical terminal; wherein the central station scrambling server is connected to the input end of the central station broadcast multiplexer, the output end of the central station broadcast multiplexer is connected to one end of the first type switch, the other end of the first type switch is connected to one end of the first type optical terminal, and the other end of the first type optical terminal is connected to the regional broadcast multiplexer in each program transmission system through an optical link; The central station scrambling server is used to scramble the received program information, obtain scrambling information, and send it to the central station broadcast multiplexer; The main station broadcast multiplexer is used to add the scrambling information to each information table of program-specific information and service information to form a corresponding transmission format TS stream; The first type of switch is used to adjust the flow of the electrical signal corresponding to the TS stream; The first type of optical terminal is used to convert the electrical signal corresponding to the TS stream into a corresponding optical signal, and transmit the TS stream to the regional broadcast multiplexer of each program transmission system through an optical link, so that the regional broadcast multiplexer can map the scrambling information of the local station in the TS stream with the audio and video of the local station into a packet identification code PID and then multiplex and forward it to the transmitter.

2. The system according to claim 1, characterized in that The program transmission system comprises: a second type optical terminal, a second type switch, a regional broadcast multiplexer and a transmitter; The second type of optical terminal is connected to the first type of optical terminal, the other end of the second type of optical terminal is connected to one end of the second type of switch, the other end of the second type of switch is connected to one end of the regional broadcast multiplexer, and the other end of the regional broadcast multiplexer is connected to the transmitter; The second type optical terminal is used to receive the TS stream transmitted by the first type optical terminal, convert the TS stream from an optical signal to a corresponding electrical signal, and send it to the corresponding second type switch; The second type switch is used to adjust the flow of the electrical signal and send it to the corresponding regional broadcast multiplexer; The regional broadcast multiplexer maps the local audio and video with the local scrambling information in the TS stream and then multiplexes and forwards it to the transmitter; The transmitter is used to transmit the audio and video of this station to the corresponding set-top box for program broadcasting.

3. The system according to claim 1, characterized in that The program remote scrambling system adopts a waterfall system to transmit the scrambling information to each regional broadcast multiplexer in the program transmission system through an optical link.

4. The system according to claim 1, characterized in that The first type of switch and the first type of optical terminal included in the program remote scrambling system correspond one-to-one to the external program transmission system.

5. The system according to claim 2, characterized in that The first type of optical terminal and the second type of optical terminal have the characteristics of performance consistency, signal matching and signal synchronization.

6. The system according to claim 1, characterized in that The program information includes at least one of the following: program name, program number and program type.

7. The system according to claim 1, characterized in that The regional broadcast multiplexer is also used for PID filtering, PID mapping, PCR correction, PSI / SI extraction, PSI / SI insertion and PSI / SI modification.

8. The system according to claim 1, characterized in that The program transmission system comprises a second type switch and a second type optical terminal.

9. The system according to claim 1, characterized in that The optical link includes one of the following: optical fiber and optical cable.

10. A program remote scrambling architecture, characterized in that: include: A program transmission system, and a program remote scrambling system as claimed in any one of claims 1 to 9; wherein the program remote scrambling system is connected to the program transmission system via an optical link; The program remote scrambling system transmits the TS stream formed by the central station broadcast multiplexer in the program remote scrambling system to the regional broadcast multiplexer in each of the program transmission systems through an optical link; the regional broadcast multiplexer PID maps the scrambling information of the station in the TS stream with the audio and video of the station and then multiplexes and forwards it to the transmitter.

Images