CN212259205U - Broadcast adapter and emergency broadcast system - Google Patents
Broadcast adapter and emergency broadcast system Download PDFInfo
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- CN212259205U CN212259205U CN202021090658.3U CN202021090658U CN212259205U CN 212259205 U CN212259205 U CN 212259205U CN 202021090658 U CN202021090658 U CN 202021090658U CN 212259205 U CN212259205 U CN 212259205U
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Abstract
The utility model relates to a broadcasting adapter and emergency broadcasting system. According to the utility model discloses the scheme that provides one kind and includes agreement adapter module, transport stream coding module and audio and video decoding module's broadcast adapter. The broadcast adapter can perform protocol conversion on emergency broadcast messages sent by an emergency broadcast platform through the protocol adaptation module, further can decode emergency broadcast audio and video carried in the emergency broadcast messages obtained after the protocol conversion by using the audio and video decoding module, can further perform code modulation on the emergency broadcast audio and video obtained after the decoding by using the Transport Stream (TS) coding module, and sends the emergency broadcast audio and video obtained after the code modulation to a ground digital television system according to audio and video broadcast control instructions carried in the emergency broadcast messages obtained after the protocol conversion, so that the rapid adaptation and forwarding of signals between the emergency broadcast platform and the ground digital television system are realized.
Description
Technical Field
The utility model relates to the field of communication technology, in particular to broadcast adapter and emergency broadcast system.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
With the continuous development of society, the emergency broadcasting industry has been rapidly developed. When an emergency happens, the government and related departments can utilize emergency broadcasting to timely convey politics, release authority information, guide social public opinion and actively assist disaster relief. In the current emergency broadcasting system, the broadcasting adapter is used as an intermediate connection device, has a function of adapting and forwarding signals between uplink and downlink ring sections, and is used for receiving, adapting and forwarding signals of the emergency broadcasting system.
At present, an emergency broadcast platform can be used as a source of emergency broadcast, but when the emergency broadcast platform wants to realize emergency broadcast through a ground digital television system, no broadcast adapter exists at present, and rapid signal adaptation and forwarding between the emergency broadcast platform and the ground digital television system can be realized.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a broadcast adapter and emergency broadcasting system for solve the problem that can't realize that the quick adaptation of signal between emergency broadcasting platform and the ground digital television system is forwardded.
In a first aspect, the utility model provides a broadcast adapter, broadcast adapter includes agreement adapter module, transport stream coding module and audio and video decoding module, agreement adapter module respectively with transport stream coding module with audio and video decoding module connects, just transport stream coding module with audio and video decoding module connects, wherein:
the protocol adaptation module is used for carrying out protocol conversion on a first emergency broadcast message sent by the emergency broadcast platform;
the audio and video decoding module is used for decoding the first emergency broadcast audio and video carried in the second emergency broadcast message obtained by the protocol conversion of the protocol adaptation module;
and the transmission stream coding module is used for coding and modulating the second emergency broadcast audio and video obtained by decoding the audio and video decoding module, and sending the third emergency broadcast audio and video obtained by coding and modulating to a ground digital television system according to the audio and video broadcast control instruction carried in the second emergency broadcast message.
In a second aspect, the present invention further provides an emergency broadcasting system, the emergency broadcasting system includes an emergency broadcasting platform, as described above, a broadcasting adapter and a terrestrial digital television system, wherein the broadcasting adapter is deployed at a terrestrial digital television front end of the terrestrial digital television system.
According to the utility model discloses the scheme that provides one kind and includes agreement adapter module, transport stream coding module and audio and video decoding module's broadcast adapter. The broadcast adapter can perform protocol conversion on emergency broadcast messages sent by an emergency broadcast platform through the protocol adaptation module, further can decode emergency broadcast audio and video carried in the emergency broadcast messages obtained after the protocol conversion by using the audio and video decoding module, can further perform code modulation on the emergency broadcast audio and video obtained after the decoding by using the Transport Stream (TS) coding module, and sends the emergency broadcast audio and video obtained after the code modulation to a ground digital television system according to audio and video broadcast control instructions carried in the emergency broadcast messages obtained after the protocol conversion, so that the rapid adaptation and forwarding of signals between the emergency broadcast platform and the ground digital television system are realized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a broadcast adapter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an emergency broadcasting system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a front panel of a broadcast adapter according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a rear panel of a broadcast adapter according to an embodiment of the present invention;
fig. 5 is a schematic view illustrating a flat cable connection between a front panel and a rear panel of a broadcast adapter according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a CPU start-up flow provided by an embodiment of the present invention;
fig. 7 is a schematic view of a processing flow of emergency broadcast messages according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that, the "plurality" or "a plurality" mentioned herein means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The terms "first," "second," and the like in the description and in the claims, and in the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein.
Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In various embodiments of the present invention, the emergency broadcast platform is a platform dedicated to government and related departments for issuing emergency broadcast messages. A terrestrial digital television system is a system for transmitting a terrestrial digital television signal (a terrestrial digital television signal is an audio/video signal). The emergency broadcast messages issued by the emergency broadcast platform need to be further issued to the terminal equipment through the terrestrial digital television system. In order to further distribute the emergency broadcast message distributed by the emergency broadcast platform to the terminal device through the terrestrial digital television system, the emergency broadcast message distributed by the emergency broadcast platform needs to be adapted through the broadcast adapter according to the distribution requirement of the terrestrial digital television system. Since the ground digital television system transmits the audio and video, the broadcast adapter needs to adapt the emergency broadcast message sent by the emergency broadcast platform to the audio and video signal required by the ground digital television system and forward the audio and video signal to the ground digital television system.
In order to realize that the quick adaptation of signal between emergent broadcast platform and the FM broadcasting system is forwardded, the embodiment of the utility model provides a broadcast adapter, this broadcast adapter's structure can be as shown in FIG. 1, including agreement adaptation module 11, transport stream coding module 13 and audio and video decoding module 12, agreement adaptation module 11 respectively with transport stream coding module 13 with audio and video decoding module 12 connects, just transport stream coding module 13 with audio and video decoding module 12 connects, wherein:
the protocol adaptation module 11 is configured to perform protocol conversion on a first emergency broadcast message sent by the emergency broadcast platform according to a conversion relationship between an emergency broadcast platform interface protocol and a terrestrial digital television system emergency broadcast instruction protocol to obtain a second emergency broadcast message;
the audio and video decoding module 12 is configured to decode the first emergency broadcast audio and video carried in the second emergency broadcast message to obtain a second emergency broadcast audio and video;
and the transport stream coding module 13 is configured to perform coding modulation on the second emergency broadcast audio/video according to an emergency broadcast standard protocol of the terrestrial digital television system to obtain a third emergency broadcast audio/video, and send the third emergency broadcast audio/video to the terrestrial digital television system according to an audio/video broadcast control instruction carried in the second emergency broadcast message.
The audio and video broadcast control instruction can be understood as a control instruction for limiting how the emergency broadcast audio and video is broadcast.
The transport stream coding module 13 sends the third emergency broadcast audio and video to the terrestrial digital television system, and can be understood as sending the third emergency broadcast audio and video to the terrestrial digital television system according to any terrestrial digital television signal sending process.
Further, in a possible implementation manner, the transmission stream coding module 13 sends the third emergency broadcast audio/video to the terrestrial digital television system according to the audio/video broadcast control instruction carried in the second emergency broadcast message, including:
and according to the audio and video broadcast control instruction carried in the second emergency broadcast message, sending a ground digital television emergency broadcast index table and a ground digital television emergency broadcast content table generated according to the third emergency broadcast audio and video to a ground digital television system.
The transport stream coding module 13 sends the emergency broadcast index table of the terrestrial digital television and the emergency broadcast table of the terrestrial digital television, which are generated according to the third emergency broadcast audio and video, to the terrestrial digital television system, and can understand that the transport streams corresponding to the emergency broadcast index table of the terrestrial digital television and the emergency broadcast table of the terrestrial digital television are sent to the terrestrial digital television system.
In a possible implementation manner, in order to ensure the safety of the emergency broadcast, the emergency broadcast message may also be sent in an encrypted manner. When the emergency broadcast message is encrypted, the emergency broadcast message may be encrypted by a predetermined cryptographic algorithm, for example, SM2 or SM3 defined by the national crypto authority.
At this time, the first emergency broadcast message sent by the emergency broadcast platform is encrypted by using a specified cryptographic algorithm; the broadcast adapter may further include an encryption/decryption module 14, where the encryption/decryption module 14 is connected to the protocol adaptation module 11 and the transport stream encoding module 13, respectively, and wherein:
the encryption and decryption module 14 is configured to decrypt the encrypted first emergency broadcast message sent by the emergency broadcast platform to obtain a first emergency broadcast message; encrypting the third emergency broadcast audio/video obtained by the transport stream coding module by using the specified cryptographic algorithm to obtain an encrypted third emergency broadcast audio/video;
the protocol adaptation module 11 performs protocol conversion on a first emergency broadcast message sent by an emergency broadcast platform, including: carrying out protocol conversion on the first emergency broadcast message obtained by decryption of the encryption and decryption module;
the transmission stream coding module 13 sends the third emergency broadcast audio/video to a terrestrial digital television system, and includes: and sending the encrypted third emergency broadcast audio and video to a ground digital television system.
In a possible implementation manner, an emergency broadcast message list may be further set in the broadcast adapter, and the protocol adaptation module may perform protocol conversion on each emergency broadcast message according to the priority of each emergency broadcast message in the emergency broadcast message list, so as to ensure that each emergency broadcast message can be processed in time.
At this time, the protocol adaptation module 11 is further configured to update an emergency broadcast message list according to the first emergency broadcast message, and perform protocol conversion on the first emergency broadcast message according to the priority of the first emergency broadcast message in the emergency broadcast message list to obtain the second emergency broadcast message.
Further, in a possible implementation manner, the updating, by the protocol adaptation module 11, the emergency broadcast message list according to the first emergency broadcast message may include:
firstly, judging whether a first emergency broadcast message is expired:
the expired emergency broadcast message is directly discarded without being processed, if the expired emergency broadcast message is not expired, whether the coverage area corresponding to the first emergency broadcast message contains the current area corresponding to the broadcast adapter is further judged:
if not, directly discarding and not processing, and if so, further judging whether the first emergency broadcast message carries a stopping instruction:
if the stop instruction is carried, deleting the first emergency broadcast message from the effective message list, so as to update the effective message list (it should be noted that if the stop instruction is carried, the first emergency broadcast message inevitably exists in the effective message list, at this time, the first emergency broadcast message needs to be deleted from the effective message list), and if the stop instruction is not carried, further judging whether the first emergency broadcast message ID exists in the effective message list:
if the emergency broadcast message with the same ID exists in the valid message list, the first emergency broadcast message in the valid message list is updated, so that the valid message list is updated (that is, if the emergency broadcast message with the same ID is received again, the emergency broadcast message with the same ID in the valid message list needs to be updated by using the emergency broadcast message received again), and if the emergency broadcast message does not exist, the first emergency broadcast message is inserted into the valid message list, so that the valid message list is updated (that is, if the emergency broadcast message with a certain ID is received for the first time, the emergency broadcast message with the ID can be added into the valid message list).
In one possible implementation manner, the priority of the first emergency broadcast message in the emergency broadcast message list may be determined according to the broadcast time of the first emergency broadcast message, and in the emergency broadcast message list, the closer the broadcast time of the emergency broadcast message is to the current time, the higher the priority is.
Based on the same inventive concept, the following system is further provided.
The embodiment of the utility model provides an emergent broadcasting system, the structure of this system can be as shown in fig. 2, including emergent broadcasting platform 21, broadcasting adapter 22 and terrestrial digital television system 23 that above-mentioned embodiment provided, wherein, broadcasting adapter 22 deploy in the terrestrial digital television front end of terrestrial digital television system 23.
In this embodiment, the emergency broadcast platform 21 may send the emergency broadcast message to the broadcast adapter 22 deployed at the front end of the terrestrial digital television, and the broadcast adapter 22 receives and analyzes the emergency broadcast message, responds to the audio/video broadcast control instruction therein, generates a terrestrial digital television emergency broadcast index table and an emergency broadcast content table transport stream (which may be referred to as an emergency broadcast transport stream), and performs multiplexing playing to the terrestrial digital television terminal (which may be referred to as a receiving terminal) through the terrestrial digital television transmitter.
The terrestrial digital tv terminal in the terrestrial digital tv system 23 can realize automatic wake-up and forced reception, and can play emergency broadcast in the manner of rolling captions or switching channel images, accompanying sound, etc.
In one possible implementation, the broadcast adapter 22 may further feed back the emergency broadcast message reception processing status to the emergency broadcast platform 21.
In one possible implementation, the terrestrial digital television terminal may transmit data back to the emergency broadcast platform 21.
In this embodiment, the emergency broadcast platform may sign the emergency broadcast message by integrating a country secret (country password) certificate security agent and a country secret signature verification module, and issue the emergency broadcast message to the adaptation layer on the distribution transmission channel through the service module for distribution transmission.
That is, in order to establish a trusted chain between the emergency broadcast platform, the broadcast adapter, and the terrestrial digital television system, the emergency broadcast platform may manage the certificate chain of the broadcast adapter and the terrestrial digital television system through a cryptographic certificate security agent. The safety protection mechanism of the emergency broadcast message adopts a digital signature mode to realize the protection of legality, integrality and authenticity, and the cryptographic algorithm can adopt SM2 and SM3 algorithms specified by the State crypto administration.
After the broadcast adapter of the distribution transmission adaptation layer receives the signed emergency broadcast message, the signature verification module can be used for verifying the signature, the adaptation processing (including coding and decoding processing, format, content adaptation and the like) is carried out after the signature is verified to be correct, and then the emergency broadcast message is issued to the next stage through the distribution channel of the stage.
When receiving an emergency broadcast message, a ground digital television terminal (emergency broadcast terminal) in the ground digital television system performs signature verification and verification through an integrated national secret signature verification module, and plays or displays the emergency broadcast message after the emergency broadcast message is verified to be correct.
The scheme provided by the first embodiment is explained by a specific example.
An embodiment of the utility model provides a broadcast adapter, this broadcast adapter can include and think adapter module, transport stream coding module, audio and video decoding module and encryption and decryption module, can also include hardware basic module, come to provide the hardware basis for broadcast adapter. The hardware basic module can comprise a power supply module, a machine frame module, a man-machine interaction key module, a network communication interface module and the like.
In a possible implementation manner, a main control Central Processing Unit (CPU) of the broadcast adapter may adopt a TI AM335X chip, which adopts an ARM core-a 8 core and has a main frequency of 800 MHZ. The chip is a CPU special for industrial control and is characterized by stable and abundant IO resources.
In this embodiment, the machine frame module may include a front panel and a rear panel, and a liquid crystal screen, keys and an indicator light may be disposed on the front panel, wherein the keys may be multi-key keys, for example, up, down, left, right, ok, exit, and the like. The indicator light can be set to be at least one, for example, a power supply warning indicator light can be set, the power supply warning indicator light is not controlled by the CPU and is turned on when power is supplied, two indicator lights can be additionally reserved, and the function of the reserved indicator light can be defined according to actual needs.
The schematic diagram of the front panel may be as shown in fig. 3, and in the schematic diagram given in fig. 3, a liquid crystal screen (the liquid crystal screen may adopt a topol micro LM16032 liquid crystal screen, and is connected to the CPU IO port in a serial manner), 4 keys (a menu key, a set key, an upward selection key, and a downward selection key, respectively), and a power supply alarm indicator are disposed on the front panel.
A network communication interface (for example, an ARM network interface, an ARM development serial port, etc.), an audio codec interface, an encryption/decryption module interface, etc. may be disposed on the back panel, and a schematic diagram of the back panel may be as shown in fig. 4.
The ARM network interface is connected according to the connection mode of the development board, and the bus length is equal as much as possible, otherwise, the bus length is easy to be unstable. The serial port for ARM development that sets up links according to the connected mode of development board, connects COM2 out, leaves a 4pin row needle interface on the bottom plate can, need not external TTL commentaries on classics 232 chip. The audio codec interface can adopt WM8960, WM8960 IIS to connect with McAAsp-0 interface of TI AM335X chip, and I2c to connect with I2C-0 of TI AM335X chip. WM8960 has multiple audio input channels, can use line input, cannot use other input channels, and otherwise causes audio distortion due to internal amplification.
The front panel and the rear panel can be connected by a flat cable, and the schematic view can be shown in fig. 5.
In the present embodiment, in terms of mechanical structure: the network communication interface and the audio codec interface are designed on the mainboard and positioned on the rear panel; the power socket and the switch are arranged on the rear panel, and the power switch can be provided with a fuse; the liquid crystal screen and the keys are made into an independent circuit board and are arranged on the front panel; the CPU core board and the encryption and decryption module are installed on the mainboard in the form of plug boards.
In terms of hardware design requirements, the problem of interference needs to be noticed in analog audio signal processing, when IO is used, a PIN for configuring a startup item and a GPMC PIN need not to be used, an encryption and decryption module installation position needs to be reserved, a 4PIN socket is adopted to be in butt joint with an encryption and decryption module, and the PINs are respectively 5V, TX, RX and GND.
In the main functions, the following basic functions are included: the front panel liquid crystal screen and the keys can inquire main parameters such as IP addresses and the like and the alarm state of the equipment; equipment configuration management, emergency broadcast service configuration and monitoring can be accessed and operated through a browser; the Ethernet interface 100M/1000M is supported, and the configuration of the main and standby 1+1 modes is supported; the receiving, storage and decoding of the emergency broadcast audio and video are supported; the receiving, storage and analysis of the audio and video broadcast control instruction are supported; the system is provided with an RS232 or other interfaces and can be externally connected with other emergency broadcast monitoring equipment; the system has a flexible and advanced backup mechanism, and can ensure safe broadcasting; the power supply module has the functions of dual power supply, alternating current/direct current selection of the power supply, hot backup and hot plug of the power supply module, no service interruption caused when the power supply module is replaced, and direct power-off function; a real-time alarm function is supported; the system is provided with a 100Base-T Ethernet interface, can realize the centralized network management based on SNMP, can carry out equipment configuration through the monitoring management of a unified network management software system, can realize the unified and centralized state monitoring through network management, and supports software upgrading; the TS stream is processed in compliance with the MPEG-2 standard, and the 204/188 packet length can be flexibly set.
On the main function, the system also comprises the following emergency broadcast platform interface functions: the interface is in butt joint with a superior emergency broadcast platform, and the interface is in accordance with GD/J083-2018 Emergency broadcast platform interface Specification; the emergency broadcast system adopts a hardware mode, has the functions of checking the signature of the received emergency broadcast message and signing an emergency broadcast table sent to a lower-level ground digital television system, and meets the processing requirement of GD/J081-2018 digital signature of emergency broadcast safety protection technical specification; the emergency broadcast protocol encapsulation, adaptation and transmission of the ground digital television system are realized, the emergency broadcast index table and the emergency broadcast content table of the ground digital television TS stream and the processing of the emergency broadcast audio and video transmission stream are included, and the output signal conforms to the ground digital television emergency broadcast technical specification GD/J087 plus 2018.
In the main function, the following requirements of the terrestrial digital television function are supported: the system is provided with an emergency broadcast index table and an emergency broadcast content table of the ground digital television TS stream and an output interface of an emergency broadcast audio/video transmission stream, and supports ASI and IP output; the ASI and gigabit IP interface supports MPTS and SPTS, and supports GbE full duplex input and output; the PSI/SI table editing, modifying and inserting functions of the TS flow of the ground digital television are supported; the method supports the preview function of the emergency broadcast table, can perform local preview viewing on detailed field definitions of a transmitted emergency broadcast index table and an emergency broadcast content table, and performs table analysis according to standard specifications; the system has the function of multiplexing the terrestrial digital television, and the multiplexed stream output by the multiplexing system conforms to the national standard; the multiplexing system supports the remapping of PID and supports the filtering of PID code streams; the device is provided with at least 2 paths of ASI input interfaces and 1 path of ASI output interfaces.
In the main function, the following security encryption function requirements are also supported: carrying out safety encryption by adopting a hardware mode; the method has the advantages that the method has an encapsulation function of the emergency broadcast protocol loaded with the protection of the national cryptographic algorithm; the emergency broadcast protocol receiving and analyzing device has the function of receiving and analyzing the emergency broadcast protocol loaded with the protection of the cryptographic algorithm.
In the main function, the following input and output interface requirements are also supported:
(1) and a 19-inch 1U standard rack type design is adopted, and different board cards can be configured according to different application scenes.
(2) There are 2 ethernet interfaces.
(3) Possess 1 way serial ports, interface type: and RS 232.
(4) The method has 1-way network management IP interface, and the interface types are as follows: and RJ 45.
(5) Possess 1 USB interface, the interface type: USB type A.
(6) The method is characterized by comprising at least 2 ASI input interfaces, 1 ASI output interface and interface types: BNC.
(7) Possess 2 way alternating current power input interfaces, the interface type: three-core power socket.
On the performance requirement, the working voltage range can be AC 100V-260V; gigabit IP throughput: more than or equal to 800 Mbps; ASI interface code rate: is more than or equal to 200 Mbps.
In the workflow, the CPU start-up process may be as shown in fig. 6, and includes: after starting up, the system automatically executes rc.local scripts, then starts up a resource release program, and then reads the encrypted information to judge whether the encrypted information is normal:
if the resource is normal, releasing the resource, executing dev _ run.local scripts in the resource, starting a web server and an application program, and starting successfully;
otherwise, the encrypted information is read again and whether the encrypted information is normal or not is judged.
The processing flow of the emergency broadcast message by the broadcast adapter may be as shown in fig. 7, and includes:
(1) and receiving an emergency broadcast message sent by an emergency broadcast platform.
(2) And judging whether the received emergency broadcast message is overdue or not, and directly discarding the overdue emergency broadcast message without processing.
(3) If the emergency broadcast message is not expired, judging whether the coverage area corresponding to the emergency broadcast message contains the current area corresponding to the broadcast adapter or not, and if not, directly discarding and not processing the emergency broadcast message.
(4) If yes, judging whether the emergency broadcast message carries a stop instruction, and if the emergency broadcast message carries the stop instruction, deleting the emergency broadcast message from the effective message list.
(5) If the emergency broadcast message does not carry the stop command, judging whether the emergency broadcast message ID exists in the effective message list, if so, updating the emergency broadcast message in the effective message list, and if not, inserting the emergency broadcast message into the effective message list.
(6) And sequencing the emergency broadcast messages in the effective message list according to the priority, wherein the closer the emergency broadcast message broadcasting time is to the current time, the higher the priority is.
(7) And (4) judging whether the emergency broadcast message with the highest priority reaches the broadcasting time, and repeating the step (6) until the broadcasting time is reached so as to realize the encapsulation and the playing of the emergency broadcast message with the highest priority.
The application program starting process comprises the following steps: initializing a liquid crystal display and a key; reading the encryption chip and checking authorization information; initializing parameters; and monitoring an emergency broadcast platform interface and executing corresponding operation.
In the application workflow, the system further includes an HTTP service (in this embodiment, an HTTP server may be configured to interface with an upper emergency broadcast platform, and mainly has an HTTP file receiving function, and an HTTP client may be further configured to push a packet to the upper emergency broadcast platform, and may be implemented by transplanting liburl), tar decompression/compression (may be implemented by transplanting libz), RTP unpacking/packaging (may autonomously implement unpacking and packaging an RTP packet header), TS packaging (may autonomously implement a library to pack an audio ES generated by encoding into a TS output and generate a basic PSI), TS emergency broadcast instruction generation (may autonomously implement a library to generate a TS instruction), audio encoding and decoding (may implement a liblame for MP3 encoding, and employ a liblame or libmad for MP3 decoding).
In this embodiment, a WEB server may be used as a platform for setting and viewing the state of the broadcast adapter, and the WEB server has the following functions: a user logs in; checking the state; local resource code configuration; selecting DVB-C/DTMB scenes; setting codes; program viewing and parameter setting; restoring factory settings; restarting the equipment; modifying the network parameters of the equipment; upgrading on line; import and export parameters, etc.
The WEB server can interact with a webpage through AJAX in content interaction and internally communicate with an application program through IPC.
In this embodiment, the broadcast adapter supports updating of all software resources including the application, driver, and WEB server itself of the device through the WEB server. In order to ensure the convenience and the confidentiality of the upgrade, a private algorithm can be adopted to package and encrypt the files needing to be upgraded. And directly providing an upgrade package each time when the upgrade is needed.
In this embodiment, the main technical features of the broadcast adapter include: the requirements of receiving, packaging and playing of national standards are met; the safety protection requirements of national standards are met; the input and output interfaces with the outside are complete; and the manual interaction operation is convenient.
The broadcast adapter provided by the embodiment can complete the butt joint adaptation of the emergency broadcast message and the terrestrial digital television system. The system can receive emergency broadcast messages issued by an emergency command center through an emergency broadcast platform, analyzes signals issued to a ground digital television channel, realizes the function of emergency broadcast, and has the functions of automatic access, safety certification, addressing awakening, protocol conversion, switching control, state acquisition and return, remote maintenance and the like.
The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. The broadcast adapter is characterized in that the broadcast adapter comprises a protocol adaptation module, a transmission stream coding module and an audio and video decoding module, the protocol adaptation module is respectively connected with the transmission stream coding module and the audio and video decoding module, the transmission stream coding module is connected with the audio and video decoding module, and the protocol adaptation module comprises:
the protocol adaptation module is used for carrying out protocol conversion on a first emergency broadcast message sent by the emergency broadcast platform;
the audio and video decoding module is used for decoding the first emergency broadcast audio and video carried in the second emergency broadcast message obtained by the protocol conversion of the protocol adaptation module;
and the transmission stream coding module is used for coding and modulating the second emergency broadcast audio and video obtained by decoding the audio and video decoding module, and sending the third emergency broadcast audio and video obtained by coding and modulating to a ground digital television system according to the audio and video broadcast control instruction carried in the second emergency broadcast message.
2. The broadcast adapter of claim 1, wherein the transport stream encoding module, according to an audio/video broadcast control instruction carried in the second emergency broadcast message, transmits a third emergency broadcast audio/video obtained by encoding and modulation to a terrestrial digital television system, and includes:
and according to the audio and video broadcast control instruction carried in the second emergency broadcast message, sending a ground digital television emergency broadcast index table and a ground digital television emergency broadcast content table generated according to the third emergency broadcast audio and video obtained by coding modulation to a ground digital television system.
3. The broadcast adapter of claim 1, wherein the first emergency broadcast message sent by the emergency broadcast platform is encrypted using a specified cryptographic algorithm; the broadcast adapter further comprises an encryption and decryption module, the encryption and decryption module is respectively connected with the protocol adaptation module and the transport stream coding module, wherein:
the encryption and decryption module is used for decrypting the encrypted first emergency broadcast message sent by the emergency broadcast platform to obtain a first emergency broadcast message; encrypting a third emergency broadcast audio/video obtained by encoding and modulating the transport stream encoding module by using the specified cryptographic algorithm to obtain an encrypted third emergency broadcast audio/video;
the protocol adaptation module performs protocol conversion on a first emergency broadcast message sent by an emergency broadcast platform, and includes: carrying out protocol conversion on the first emergency broadcast message obtained by decryption of the encryption and decryption module;
the transport stream coding module sends the third emergency broadcast audio and video obtained by coding modulation to the ground digital television system, and comprises: and sending the encrypted third emergency broadcast audio and video to a ground digital television system.
4. The broadcast adapter of any one of claims 1 to 3, wherein the protocol adaptation module is further configured to update an emergency broadcast message list according to the first emergency broadcast message, and perform protocol conversion on the first emergency broadcast message according to a priority of the first emergency broadcast message in the emergency broadcast message list to obtain the second emergency broadcast message.
5. An emergency broadcasting system, comprising an emergency broadcasting platform, a broadcasting adapter according to any one of claims 1 to 4, and a terrestrial digital television system, wherein the broadcasting adapter is deployed at a terrestrial digital television front end of the terrestrial digital television system.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114449317A (en) * | 2021-12-27 | 2022-05-06 | 福建新大陆通信科技股份有限公司 | Digital television emergency broadcasting method |
| CN115842931A (en) * | 2022-11-28 | 2023-03-24 | 北京交大思源科技有限公司 | Television broadcasting system and method for emergency broadcast message |
| CN116488757A (en) * | 2023-05-12 | 2023-07-25 | 北京悦视科技有限公司 | Urban emergency broadcast media adaptation method and system |
| WO2023186192A3 (en) * | 2023-07-12 | 2024-03-14 | 六安景顺长华科技有限公司 | Dtmb set-top box for emergency broadcast activated by fm-cdr |
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2020
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114449317A (en) * | 2021-12-27 | 2022-05-06 | 福建新大陆通信科技股份有限公司 | Digital television emergency broadcasting method |
| CN115842931A (en) * | 2022-11-28 | 2023-03-24 | 北京交大思源科技有限公司 | Television broadcasting system and method for emergency broadcast message |
| CN116488757A (en) * | 2023-05-12 | 2023-07-25 | 北京悦视科技有限公司 | Urban emergency broadcast media adaptation method and system |
| WO2023186192A3 (en) * | 2023-07-12 | 2024-03-14 | 六安景顺长华科技有限公司 | Dtmb set-top box for emergency broadcast activated by fm-cdr |
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