CN212486801U - Emergency broadcast adapter and emergency broadcast system - Google Patents
Emergency broadcast adapter and emergency broadcast system Download PDFInfo
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- CN212486801U CN212486801U CN202021090703.5U CN202021090703U CN212486801U CN 212486801 U CN212486801 U CN 212486801U CN 202021090703 U CN202021090703 U CN 202021090703U CN 212486801 U CN212486801 U CN 212486801U
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Abstract
The utility model relates to an emergent broadcast adapter and emergent broadcasting system. According to the utility model discloses the scheme that provides an emergent broadcast adapter including agreement adaptation module, wireless digital system coding module and audio decoding module. The emergency broadcast adapter can perform protocol conversion on emergency broadcast messages sent by an emergency broadcast platform through the protocol adaptation module, and further can decode emergency broadcast audio carried in the emergency broadcast messages obtained after the protocol conversion by using the audio decoding module, and can further perform code modulation on the emergency broadcast audio obtained after the decoding by using the Radio Digital System (RDS) coding module, and according to audio broadcast control instructions carried in the emergency broadcast messages obtained after the protocol conversion, the emergency broadcast audio obtained after the code modulation is sent to the frequency modulation broadcast system, so that the rapid adaptation and forwarding of signals between the emergency broadcast platform and the frequency modulation broadcast system are realized.
Description
Technical Field
The utility model relates to the field of communication technology, in particular to emergent broadcast adapter and emergent 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 frequency modulation broadcast system, no broadcast adapter exists at present, and rapid signal adaptation and forwarding between the emergency broadcast platform and the frequency modulation broadcast system can be realized.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an emergent broadcast adapter and emergent broadcasting system for solve the problem that can't realize that the quick adaptation of signal between emergent broadcasting platform and the frequency modulation broadcasting system is forwardded.
In a first aspect, the utility model provides an emergency broadcast adapter, emergency broadcast adapter includes agreement adapter module, wireless digital system coding module and audio decoding module, agreement adapter module respectively with wireless digital system coding module with audio decoding module connects, just wireless digital system coding module with audio 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 decoding module is used for decoding a first emergency broadcast audio carried in a second emergency broadcast message obtained by the protocol conversion of the protocol adaptation module;
and the wireless digital system coding module is used for coding and modulating the second emergency broadcast audio obtained by decoding the audio decoding module, and sending the third emergency broadcast audio obtained by coding and modulating to the frequency modulation broadcast system according to the audio 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 above, an emergency broadcasting adapter and a fm broadcasting system, wherein the emergency broadcasting adapter is deployed in the broadcast transmitting station of the fm broadcasting system.
According to the utility model discloses the scheme that provides an emergent broadcast adapter including agreement adaptation module, wireless digital system coding module and audio decoding module. The emergency broadcast adapter can perform protocol conversion on emergency broadcast messages sent by an emergency broadcast platform through the protocol adaptation module, and further can decode emergency broadcast audio carried in the emergency broadcast messages obtained after the protocol conversion by using the audio decoding module, and can further perform code modulation on the emergency broadcast audio obtained after the decoding by using the Radio Digital System (RDS) coding module, and according to audio broadcast control instructions carried in the emergency broadcast messages obtained after the protocol conversion, the emergency broadcast audio obtained after the code modulation is sent to the frequency modulation broadcast system, so that the rapid adaptation and forwarding of signals between the emergency broadcast platform and the frequency modulation broadcast 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 an emergency 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 an emergency broadcast adapter according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a rear panel of an emergency broadcast adapter according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a CPU start-up flow provided by an embodiment of the present invention;
fig. 6 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. An fm broadcast system is a system that transmits audio signals in a frequency modulated manner. The emergency broadcast messages issued by the emergency broadcast platform need to be further issued to the terminal equipment through the frequency modulation broadcast system. In order to further release the emergency broadcast message released by the emergency broadcast platform to the terminal device through the fm broadcast system, the emergency broadcast message released by the emergency broadcast platform needs to be adapted through the emergency broadcast adapter according to the release requirement of the fm broadcast system. Because the fm broadcast system transmits audio, the emergency broadcast adapter needs to adapt the emergency broadcast message sent by the emergency broadcast platform to an audio signal required by the fm broadcast system, and forward the audio signal to the fm broadcast system.
In order to realize the signal fast adaptation between emergent broadcast platform and the FM broadcasting system and forward, the embodiment of the utility model provides an emergent broadcast adapter, this emergent broadcast adapter's structure can be as shown in FIG. 1, including agreement adapter module 11, wireless digital system coding module 13 and audio decoding module 12, agreement adapter module 11 respectively with wireless digital system coding module 13 with audio decoding module 12 connects, just wireless digital system coding module 13 with audio decoding module 12 connects, wherein:
the protocol adaptation module 11 is configured to perform protocol conversion on a first emergency broadcast message sent by an emergency broadcast platform according to a conversion relationship between an emergency broadcast platform interface protocol and an emergency broadcast instruction protocol of the fm broadcast system, so as to obtain a second emergency broadcast message;
the audio decoding module 12 is configured to decode the first emergency broadcast audio carried in the second emergency broadcast message to obtain a second emergency broadcast audio;
the wireless digital system coding module 13 is configured to perform coding modulation on the second emergency broadcast audio according to an emergency broadcast standard protocol of the fm broadcast system to obtain a third emergency broadcast audio, and send the third emergency broadcast audio to the fm broadcast system according to an audio broadcast control instruction carried in the second emergency broadcast message.
The audio broadcast control instruction may be understood as a control instruction defining how emergency broadcast audio is broadcast.
The wireless digital system coding module 13 transmits the third emergency broadcast audio to the fm broadcast system, and may be understood to transmit the third emergency broadcast audio and video to the fm broadcast system according to any fm broadcast signal transmission flow.
In a possible implementation manner, if the distribution terminal corresponding to the first emergency broadcast message is of a designated type (e.g., radio), the wireless digital system encoding module 13 sends the third emergency broadcast audio to the fm broadcast system according to an audio broadcast control instruction carried in the second emergency broadcast message, including:
and sending the third emergency broadcast audio to an audio switcher, and controlling the audio switcher to output the third emergency broadcast audio to a frequency modulation broadcast transmitter according to an audio broadcast control instruction carried in the second emergency broadcast message. That is, the audio switcher can switch the fm broadcast signal being played by the fm broadcast system to the emergency broadcast audio that is adaptively forwarded by the emergency broadcast adapter for broadcasting.
In another possible implementation manner, if the issuing terminal corresponding to the first emergency broadcast message is of a set type (for example, a loud speaker terminal or a wireless fm terminal), the wireless digital system encoding module 13 sends the third emergency broadcast audio to the fm broadcast system according to an audio broadcast control instruction carried in the second emergency broadcast message, including:
and sending a first frequency modulation instruction carried in the second emergency broadcast message to a wireless digital system coding controller, receiving a second frequency modulation instruction fed back by the wireless digital system coding controller, sending the second frequency modulation instruction and third emergency broadcast audio to an audio switcher, and controlling the audio switcher to output the second frequency modulation instruction and the third emergency broadcast audio to a frequency modulation broadcast transmitter according to an audio broadcast control instruction carried in the second emergency broadcast message.
It should be noted that, the wireless digital system encoding controller may obtain the second fm instruction by:
generating a wireless digital system data packet according to the first frequency modulation instruction, and packaging the wireless digital system data packet into a wireless digital system data frame;
and carrying out baseband coding and subcarrier modulation on the wireless digital system data frame to obtain a second frequency modulation instruction.
The fm command may be understood as a control command for adjusting the broadcast frequency of the issuing terminal.
That is to say, the RDS encoding controller can process the fm instruction to obtain the fm instruction signal sent to the fm broadcast signal, so as to realize the automatic wake-up and forced reception of the issuing terminal in the audio baseband manner.
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 emergency broadcast platform sends an encrypted first emergency broadcast message encrypted by using a specified cryptographic algorithm; the emergency 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 wireless digital system coding 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 obtained by the wireless digital system coding module by using the appointed cryptographic algorithm to obtain an encrypted third emergency broadcast audio;
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 wireless digital system encoding module 13 transmits the third emergency broadcast audio to the fm broadcast system, including: and sending the encrypted third emergency broadcast audio to a frequency modulation broadcast system.
Based on the same inventive concept, the following system is further provided.
The embodiment of the utility model provides an emergency broadcasting system, this system's structure can be as shown in fig. 2, including emergency broadcasting platform 21, emergency broadcasting adapter 22 and frequency modulation broadcasting system 23 that above-mentioned embodiment provided, wherein, emergency broadcasting adapter 22 deploy in frequency modulation broadcasting system 23's broadcast transmitting station.
In fig. 2, it is illustrated that the distribution terminal (which may be referred to as an emergency broadcast terminal) corresponding to the first emergency broadcast message distributed by the emergency broadcast platform includes a radio, a loud speaker terminal, and a wireless fm terminal.
In this embodiment, the emergency broadcast platform may be a multi-stage emergency broadcast platform, and each stage of emergency broadcast platform may be understood as a corresponding peer fm broadcast system. An fm broadcast system may distribute emergency broadcast messages sent by a peer emergency broadcast platform or a higher emergency broadcast platform.
That is, the emergency broadcast adapter 22 disposed at the broadcast transmitting station of the fm broadcast system 23 may be adapted to transmit a third emergency broadcast audio (fm broadcast signal) to the audio switcher corresponding to the emergency broadcast message transmitted by the emergency broadcast platform 21 (which may be an emergency broadcast platform at the same level as the fm broadcast system 23, or an emergency broadcast platform at a higher level than the fm broadcast system 23), and control the audio switcher to output the third emergency broadcast audio to the fm broadcast transmitter according to the audio broadcast control instruction, so as to implement emergency broadcast to a specified type of distribution terminal (for example, a radio receiver as shown in fig. 2) through the fm broadcast transmitter.
The emergency broadcast adapter 22 disposed at the broadcast transmitting station of the fm broadcast system 23 may also send a first fm instruction carried in an emergency broadcast message sent by the emergency broadcast platform 21 (which may be an emergency broadcast platform at the same level as the fm broadcast system 23, or an emergency broadcast platform at an upper level of the fm broadcast system 23) to the RDS encoding controller, obtain a second fm instruction by the RDS encoding controller, and further send the second fm instruction fed back by the RDS encoding controller, and the third emergency broadcast audio is sent to an audio switcher, and the audio switcher is controlled to output the second frequency modulation instruction and the third emergency broadcast audio to a frequency modulation broadcast transmitter according to an audio broadcast control instruction, emergency broadcasting to set types of distribution terminals (e.g., a loud-speaker terminal and a wireless fm terminal as shown in fig. 2) is implemented by an fm broadcast transmitter.
Namely, the emergency broadcast adapter and the RDS coding adapter can be used for jointly completing the adaptation and the forwarding of the emergency broadcast message at the broadcast transmitting station, so that the automatic awakening and the forced receiving of the issuing terminal can be realized in an audio baseband mode.
In one possible implementation, the audio switch may feed back information reception processing conditions to the emergency broadcast adapter 22.
In one possible implementation, the emergency broadcast adapter 22 may further feed back the emergency broadcast message reception processing status to the emergency broadcast platform 21.
In one possible implementation, emergency broadcast terminals with a backhaul function (e.g., a loud speaker terminal and a wireless fm terminal) may transmit data back to the emergency broadcast platform 21.
It should be noted that, as shown in fig. 2, the audio switch and the RDS encoding controller may be integrated in the broadcast transmitting station of the fm broadcast system 23.
As can be seen from the above description, the emergency broadcast adapter in this embodiment may be a two-in-one emergency broadcast adapter, in which emergency broadcast to a specific type of distribution terminal may be implemented by using a fm broadcast system, or emergency broadcast to a set type of distribution terminal may be implemented by using a fm broadcast system. Of course, the emergency broadcast adapter may also implement emergency broadcast to a specified type of distribution terminal solely through the fm broadcast system, or implement emergency broadcast to a set type of distribution terminal solely through the fm broadcast system.
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, to establish a trusted chain between the emergency broadcast platform, the emergency broadcast adapter, and the fm broadcast system, the emergency broadcast platform may manage the certificate chain of the emergency broadcast adapter and the fm broadcast system via a national security certificate 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 receiving the signed emergency broadcast message, the emergency broadcast adapter of the distribution transmission adaptation layer can check the signature through the national secret signature verification module, correct verification and adaptation processing (including coding and decoding processing, format, content adaptation and the like) are carried out, and then the emergency broadcast message is issued to the next stage through the distribution channel of the stage.
When a release terminal (emergency broadcast terminal) in the frequency modulation broadcast system receives an emergency broadcast message, the integrated national secret signature verification module is used for verifying and verifying the signature, and the signature is played or displayed after the signature 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 an emergent broadcast adapter, this emergent broadcast adapter can also include the hardware foundation module except can including agreement adaptation module, wireless digital system coding module, audio decoding module and encryption and decryption module, comes to provide the hardware foundation for emergent 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 emergency broadcast adapter may adopt a TI AM335X chip, the chip adopts an ARM coordinate-a 8 core, and the master frequency is 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 flat cables.
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, storing and decoding of emergency broadcast audio are supported; the receiving, storing and analyzing of the audio broadcasting 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 function of butt joint with an automatic system of the frequency modulation broadcast transmitter is supported, and the working state of the frequency modulation broadcast transmitter can be obtained from the automatic system; and supporting an output control instruction, and controlling the audio switcher to switch and output the emergency broadcast audio program.
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 subordinate frequency modulation broadcast system, and meets the processing requirement of GD/J081-2018 digital signature of emergency broadcast safety protection technical specification; the method realizes the encapsulation, adaptation and transmission of the RDS emergency broadcast protocol of the FM broadcast system, and comprises the functions of RDS baseband coding of the FM broadcast system, RDS data generation and RDS transmission of emergency broadcast, and audio output of emergency broadcast, wherein output signals conform to GD/J085-2018 technical specification of analog FM emergency broadcast.
In the main function, the following requirements of frequency modulation broadcasting function are supported: the emergency broadcasting analog audio output is provided, and stereo differential audio signal output is supported; the emergency broadcast RDS baseband signal output is provided, and the emergency broadcast RDS baseband signal output can be directly connected with an RDS interface of a frequency modulation broadcast transmitter; the baseband RDS output amplitude can be adjusted.
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) Possess 1 RDS output interface, the interface type: 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; the RDS interface rate may be 1.1875 kbps; the RDS output frequency may be 57 kHz. The RDS output amplitude can be 0-3.3Vpp, and the amplitude can be adjusted.
In the workflow, the CPU start-up process may be as shown in fig. 5, 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 emergency broadcast adapter may be as shown in fig. 6, 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 emergency 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 set to interface with an upper emergency broadcast platform, and mainly has an HTTP file receiving function, and an HTTP client may be set to push a packet to the upper emergency broadcast platform, and may be implemented by transplanting libcurl), tar decompression/compression (may be implemented by transplanting libz), RTP decompression/packaging (may autonomously implement the decompression and packaging of an RTP packet header), RDS packaging (may autonomously implement a library to package an audio ES generated by encoding into an RDS output, and generate a basic PSI), RDS emergency broadcast instruction generation (may autonomously implement a library to generate an RDS instruction), audio codec (may employ liblame for MP3 encoding, and employ liblame or libmad for MP3 decoding).
In this embodiment, a WEB server may be used as a platform for setting and checking the state of the emergency 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 emergency broadcast adapter supports the update 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 emergency 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 emergency broadcast adapter provided by the embodiment can complete the butt joint adaptation of the emergency broadcast message and the frequency modulation broadcast system. The emergency broadcast receiving and transmitting system can receive emergency broadcast messages issued by an emergency command center through an emergency broadcast platform, analyzes signals issued to a frequency modulation broadcast channel, achieves 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 (8)
1. An emergency broadcast adapter, comprising a protocol adaptation module, a wireless digital system coding module and an audio decoding module, wherein the protocol adaptation module is connected with the wireless digital system coding module and the audio decoding module respectively, and the wireless digital system coding module is connected with the audio decoding module, 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 decoding module is used for decoding a first emergency broadcast audio carried in a second emergency broadcast message obtained by the protocol conversion of the protocol adaptation module;
and the wireless digital system coding module is used for coding and modulating the second emergency broadcast audio obtained by decoding the audio decoding module, and sending the third emergency broadcast audio obtained by coding and modulating to the frequency modulation broadcast system according to the audio broadcast control instruction carried in the second emergency broadcast message.
2. The emergency broadcast adapter of claim 1, wherein if the distribution terminal corresponding to the first emergency broadcast message is of a specific type, the wireless digital system encoding module sends a third emergency broadcast audio obtained by encoding and modulating to the fm broadcast system according to an audio broadcast control instruction carried in the second emergency broadcast message, and the method includes:
and sending the third emergency broadcast audio obtained by coding modulation to an audio switcher, and controlling the audio switcher to output the third emergency broadcast audio to a frequency modulation broadcast transmitter according to an audio broadcast control instruction carried in the second emergency broadcast message.
3. The emergency broadcast adapter of claim 2 wherein the specified type comprises a radio.
4. The emergency broadcast adapter of claim 1, wherein if the distribution terminal corresponding to the first emergency broadcast message is of a set type, the wireless digital system encoding module sends a third emergency broadcast audio obtained by encoding and modulating to the fm broadcast system according to an audio broadcast control command carried in the second emergency broadcast message, and the method includes:
and sending a first frequency modulation instruction carried in the second emergency broadcast message to a wireless digital system coding controller, receiving a second frequency modulation instruction fed back by the wireless digital system coding controller, sending the second frequency modulation instruction and third emergency broadcast audio obtained by coding modulation to an audio switcher, and controlling the audio switcher to output the second frequency modulation instruction and the third emergency broadcast audio to a frequency modulation broadcast transmitter according to an audio broadcast control instruction carried in the second emergency broadcast message.
5. An emergency broadcast adapter according to claim 4, wherein the setting types include a loud speaker terminal and a wireless fm terminal.
6. The emergency broadcast adapter of claim 4 wherein the wireless digital system code controller obtains the second fm instructions by:
generating a wireless digital system data packet according to the first frequency modulation instruction, and packaging the wireless digital system data packet into a wireless digital system data frame;
and carrying out baseband coding and subcarrier modulation on the wireless digital system data frame to obtain a second frequency modulation instruction.
7. The emergency broadcast adapter of any one of claims 1 to 6 wherein the emergency broadcast platform sends the encrypted first emergency broadcast message encrypted using a specified cryptographic algorithm; the emergency broadcast adapter further comprises an encryption and decryption module, the encryption and decryption module is respectively connected with the protocol adaptation module and the wireless digital system 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 obtained by coding and modulating the wireless digital system coding module by using the specified cryptographic algorithm to obtain an encrypted third emergency broadcast audio;
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 wireless digital system coding module sends a third emergency broadcast audio frequency obtained by coding modulation to a frequency modulation broadcast system, and comprises: and sending the encrypted third emergency broadcast audio to a frequency modulation broadcast system.
8. An emergency broadcasting system, comprising an emergency broadcasting platform, an emergency broadcasting adapter according to any one of claims 1 to 7, and a fm broadcasting system, wherein the emergency broadcasting adapter is disposed at a broadcasting transmitting station of the fm broadcasting system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021090703.5U CN212486801U (en) | 2020-06-12 | 2020-06-12 | Emergency broadcast adapter and emergency broadcast system |
Applications Claiming Priority (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116192313A (en) * | 2022-05-20 | 2023-05-30 | 北京恒业世纪科技股份有限公司 | Broadcast control method, broadcast access device and emergency broadcast system |
| CN116566526A (en) * | 2023-05-12 | 2023-08-08 | 北京悦视科技有限公司 | Media terminal adaptation method and system supporting emergency broadcasting |
| CN118118112A (en) * | 2024-04-01 | 2024-05-31 | 广州市突发事件预警信息发布中心(广州市气象探测数据中心) | An emergency broadcast system based on VHF |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116192313A (en) * | 2022-05-20 | 2023-05-30 | 北京恒业世纪科技股份有限公司 | Broadcast control method, broadcast access device and emergency broadcast system |
| CN116566526A (en) * | 2023-05-12 | 2023-08-08 | 北京悦视科技有限公司 | Media terminal adaptation method and system supporting emergency broadcasting |
| CN118118112A (en) * | 2024-04-01 | 2024-05-31 | 广州市突发事件预警信息发布中心(广州市气象探测数据中心) | An emergency broadcast system based on VHF |
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