LDSW emergency broadcast communication system and working method

Abstract

According to the LDSW emergency broadcast communication system and the working method provided by the invention, by virtue of the characteristics of wide coverage of high-power wireless broadcast signals and long propagation of low-rate wireless digital signals, broadcast receiving equipment of various sizes in a dormant state is awakened by utilizing an ultra-low power consumption and ultra-long distance sleep awakening function of an LDSW technology in an emergency. Comprising a movable pocket radio and an LDSW interphone, or a fixedly-mounted small household loudspeaker and a centralized broadcast large loudspeaker, so that the mobile pocket radio and the LDSW interphone can immediately enter a state of receiving and broadcasting an emergency alarm signal when needed. Therefore, in a low-cost and feasible mode, the majority of common people can receive the alarm information in time when an emergency occurs. A worker with the LDSW interphone can transmit local disaster situations and disaster relief dispatching command commands to the general public in a voice or text information mode through the local large and small loudspeakers, the LDSW interphone and the base station, and transmit the local disaster situations and disaster relief dispatching command commands to a remote command center through the fixed or movable LDSW satellite base station.

Description

Technical Field

[0001] The present invention relates to the technical field of emergency broadcast communication, and in particular to an LDSW emergency broadcast communication system and a working method. Background Art

[0002] The technology currently used for emergency broadcasting is IP network communication and FM voice broadcasting, which can be used normally under normal circumstances. Figure 1 . However, in the case of "three disconnections", that is, power outage, network disconnection, and circuit disconnection, it is difficult for conventional voice broadcasting to ensure that emergency information can be delivered to everyone who needs to be notified. Even the pocket radios used by ordinary people may not be able to receive emergency notification information broadcast by radio stations for various reasons. These reasons include not being able to receive signals due to long distances, the radio being turned off, or the radio not being listened to on the emergency communication broadcast channel; the village-level local broadcasting system is currently difficult to achieve remote wireless control, but requires people to operate it in the village broadcasting room. The coverage of large speakers is limited, and it is difficult to convey emergency evacuation notices to the general public, especially in rural areas where people live in dispersed areas. The radio equipment in villagers' homes needs to be manually turned on and adjusted to the specified frequency to listen to emergency broadcasts, which has limited support for the timeliness and delivery of emergency notifications.

[0003] It is obvious that the country and the general public are in urgent need of a technical means so that when a disaster occurs, the higher-level emergency relief center can understand the disaster situation in the villages and towns below, so as to efficiently mobilize disaster relief materials and personnel from all over the country and accurately command disaster relief; local cadres also need to understand the specific disaster situation in the local area, notify the local people in a timely manner, and effectively command specific emergency relief work. Summary of the invention

[0004] In view of this, the present invention provides a LDSW emergency broadcast communication system and working method to solve the above problems.

[0005] In order to solve the above technical problems, the present invention provides an LDSW emergency broadcast communication system, which includes at least one regional emergency rescue command and control center, one or more LDSW transmitters that transmit LDSW narrowband digital signals, and one or more LDSW speaker tags connected to voice playback speakers; they all have unique identity codes or regional group codes; wireless narrowband digital communication with the identity code or group code as the receiving address can be carried out between the transmitter and the LDSW speaker tag; they can be installed in a fixed position, or installed or placed on a mobile carrier such as a vehicle, an unmanned aerial vehicle, a ship, or a person; the LDSW speaker tag can be connected to a pocket speaker that people carry with them. The LDSW speaker tag is usually in a low-power state of periodic sleep and listens to the working instruction signal from the transmitter for a moment after waking up, and has the function of converting the received digital text information into voice and playing it through the speaker connected to it; the LDSW transmitter does not work normally and is only started in an emergency. Its task at least includes one-way broadcasting of LDSW digital signals to all target LDSW speaker tags within its signal coverage range, issuing a request for the radio connected to it to turn on the emergency broadcast frequency The LDSW transmitter receives emergency broadcast commands on the road, or requires the LDSW speaker tag to turn on the speaker connected to it, and converts the received digital text information to be broadcast into voice for broadcast; the signal transmission power of the LDSW transmitter will be determined according to the size of its signal coverage; the LDSW transmitter is divided into an LDSW speaker tag installed on the broadcast tower, which uses a large transmission power to connect the broadcast speaker within its signal coverage only when needed, an LDSW transmitter that unidirectionally transmits digital signal work instruction signals, and an LDSW transmitter installed on a village or urban community broadcasting station with the ability to communicate with the LDSW intercom in two directions. Or it is a portable LDSW intercom that can perform the task of the LDSW transmitter; the LDSW intercom described here has built-in LDSW speaker tag and LDSW transmitter, so it can undertake the work of both LDSW transmitter and LDSW speaker tag; the LDSW intercom can perform voice intercom communication and text information exchange; it can work on sub-G wireless frequency band and 2.4G and other frequency bands; the LDSW intercom can also be composed of a mobile phone plug-in and a general smart phone, and they can perform wireless voice and text communication without relying on mobile networks.

[0006] Furthermore, the wireless communication between the LDSW transmitter and the LDSW horn tag includes at least the following working mode: when the LDSW transmitter is required to send an emergency broadcast digital signal, the LDSW transmitter will continuously and repeatedly transmit the work instruction signal package within a period of time greater than the sleep-wake cycle of the LDSW horn tag, and seize the moment when the LDSW horn tag sleeps and wakes up to monitor the signal to establish communication with it, convey the work instruction task to it, and transmit the specific text information content that it needs to broadcast when necessary; while the LDSW horn tag is usually in a periodic sleep state, and after waking up, it will monitor the work instruction signal from the LDSW transmitter. A moment of low-power standby state; the LDSW speaker tag will use this moment to monitor the RF signal from the outside world. The length of this moment should be as short as possible, but it must be ensured that the LDSW speaker tag can use the monitored RF signal to determine whether the signal meets the communication frequency, modulation method, encoding method or address code required to establish wireless communication with the LDSW transmitter. Part or all of the requirements, if it meets the requirements, the LDSW speaker tag will extend the receiving time to receive a verified complete digital signal package; if it does not meet the requirements, the LDSW tag will immediately enter a low-power sleep state and wait for the next signal monitoring moment.

[0007] Furthermore, all broadcast receiving equipment equipped with LDSW speaker tags, including pocket radios, must, in any case, at least be guaranteed to have the power required to maintain the LDSW speaker tag's periodic sleep-wake monitoring and be able to execute working instructions from the LDSW transmitter.

[0008] Furthermore, the transmitter installed at the radio station in villages and towns with low population density and capable of at least two-way communication with LDSW walkie-talkies adopts a lower communication frequency of 433 MHz or a dedicated emergency communication frequency band to achieve a longer communication distance; and the LDSW transmitter installed in the community radio center in densely populated cities will additionally add an LDSW transceiver working on the 2.4G frequency band to communicate with the LDSW walkie-talkies working on the 2.4G frequency band and the LDSW smart student card / senior citizen card to meet the more intensive communication needs within a limited distance.

[0009] Furthermore, the LDSW transmitter installed on some or all of the broadcasting sites in villages, towns or urban communities is also connected to a satellite two-way communication module and a mobile network terminal module, so that it can communicate with the outside world through the mobile public network under normal circumstances; in the event of a mobile network interruption, the local disaster situation can also be uploaded to a distant emergency command and control center through the satellite communication module.

[0010] Furthermore, the method for inputting, outputting and displaying text information of the LDSW walkie-talkie includes the identity information of the LDSW walkie-talkie, the satellite coordinate position information generated by the built-in satellite positioning module, the pre-defined digital code information representing different text contents, or the text information generated or displayed by the LDSW walkie-talkie through the built-in text information input and output display module, and the wireless communication connection established with the smart phone by the built-in Bluetooth module can be used to realize the function of editing and displaying text information by using the smart phone.

[0011] In addition, the present invention also provides a working method of an LDSW emergency broadcast communication system, which utilizes the ultra-low power consumption and ultra-long-distance sleep and wake-up functions of the new generation of LDSW narrowband Internet of Things communication technology, as well as the high position of the antenna of the existing broadcast system transmission tower, large transmission power, and wide coverage of the one-way broadcast signal, especially the advantage of being able to achieve longer-distance signal coverage when low-rate broadcast digital text information is adopted; and only in an emergency, the high-power LDSW narrowband wireless signal emergency broadcast transmitter installed on the transmission tower is temporarily started, and various emergency broadcast devices that are usually in a low-power sleep state or a certain working state within the signal coverage range are awakened by transmitting a long-distance wake-up work command signal. This includes movable LDSW pocket radios and LDSW walkie-talkies, as well as fixed ones. The installed indoor small household speakers and outdoor large broadcast speakers are awakened so that they can immediately enter the working state of receiving and broadcasting alarm information when any emergency occurs; the immediate entry into the working state of broadcasting alarm information here means that after the LDSW speaker tag is awakened and receives the working instruction, it will immediately turn on the pocket radio that people carry with them, or the large broadcast speaker connected to the village radio station radio, so that it can immediately broadcast the voice alarm information broadcast from the radio station; or after the LDSW speaker tag receives the digital text working instruction broadcast from the LDSW transmitter, including the text information content that needs to be broadcast, the text content to be broadcast will be played out in the form of voice through the text-to-speech function module connected to the LDSW speaker tag.

[0012] Furthermore, in order to solve the problem of uploading local disaster-related information to a distant command and control center, or conveying disaster-related information and command and dispatch work instructions to every citizen in the area who is related to the disaster, the method of the present invention also adopts a method of establishing an LDSW gateway base station in a local village or urban community that can at least communicate with an LDSW walkie-talkie in two directions and is connected to a mobile network terminal and a satellite two-way communication module, so that authorized emergency rescue workers can use the LDSW walkie-talkie they carry with them to contact the outside world through the mobile network terminal at ordinary times, and can also contact the outside world through the satellite two-way communication terminal when the mobile network is interrupted; at the same time, he can also broadcast and convey various information related to local emergency rescue at any time through the LDSW gateway base station to various LDSW speaker tags within its signal coverage area.

[0013] Furthermore, the LDSW intercom and the LDSW pocket radio can be combined into one, to become an LDSW intercom with radio function or an LDSW radio with LDSW intercom function.

[0014] Furthermore, only when an emergency occurs, the emergency broadcast communication equipment connected to the LDSW speaker tag, which is usually in an ultra-low power sleep state or a certain working state, is started to enter the emergency working state by waking up the LDSW speaker tag; any equipment connected to the LDSW tag for emergency broadcast communication, including radios, walkie-talkies, etc., can also be used normally, but when receiving the LDSW alarm work instruction, they will stop working and enter the state of receiving emergency alarm information, and all emergency broadcast equipment connected to the LDSW speaker tag must retain at least the power required to maintain the LDSW tag's periodic sleep and wake-up signal monitoring moment, and to monitor the emergency broadcast work instruction signal and execute the emergency broadcast work task when in normal use.

[0015] The beneficial effects of the present invention are:

[0016] The LDFSW emergency broadcast communication system and working method provided by the present invention is a simple, low-cost and practical solution independently developed in view of the frequent occurrence of various disasters in my country and the world in recent years, while the existing emergency communication means in my country are not only expensive but also out of touch with reality. It takes into account the current actual situation in my country, especially the actual situation in the vast rural areas, and makes full use of the favorable conditions of my country's existing broadcast communication facilities, as well as the principle of dual use for peacetime and emergency. It can not only basically solve the problem of emergency broadcasting and communication in my country's current emergency relief work, but also can be promoted to foreign countries, especially developing countries and regions. Therefore, its benefits are very significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1A schematic diagram of a normal FM broadcasting system provided by the background technology of an embodiment of the present invention;

[0018] Figure 2 A schematic diagram of an LDSW emergency broadcast communication system provided by an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of a village emergency broadcast communication system provided by an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of a city emergency broadcast communication system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0022] See also Figure 2 , the system structure of this embodiment is:

[0023] The LDSW emergency broadcast communication system includes at least one regional emergency rescue command center, one or more LDSW transmitters that transmit LDSW narrowband digital signals, and one or more LDSW speaker tags connected to voice playback speakers; all of them have unique identity codes or regional group codes.

[0024] The LDSW transmitter and the LDSW speaker tag can carry out wireless narrowband digital communication with the identity code or group code as the receiving address, so that in case of emergency transmission, the command center can choose to broadcast publicly or to broadcast to a specific area or person as needed.

[0025] LDSW transmitters and various broadcasting devices connected to LDSW speaker tags can be installed in fixed locations, or installed on mobile carriers such as vehicles, drones, and ships, or carried by people. LDSW speaker tags can be connected to pocket radios or other radios that people carry with them, or to small emergency alarm speakers installed in fixed locations indoors, and can also be connected to general outdoor broadcast loudspeakers.

[0026] The working method of this embodiment adopts the following scheme:

[0027] The LDSW speaker tag is usually in a low-power state where it periodically sleeps and listens to the working command signal from the LDSW transmitter for a moment after waking up. Therefore, it consumes very little power and can be driven by batteries, reducing the maintenance cost of the emergency communication system. The LDSW speaker tag also has the function of converting the received digital text information into voice and playing it through the speaker connected to it.

[0028] The LDSW transmitter is not normally operated to reduce interference with existing communication systems and reduce power requirements. It is only activated in emergency situations. The tasks of the LDSW transmitter include at least one-way broadcasting of LDSW digital signals to all target LDSW speaker tags within its signal coverage, issuing commands to the connected radio to start receiving emergency broadcasts on the emergency broadcast channel, or issuing commands requiring the LDSW speaker tag to turn on the speaker connected to it, converting the received digital text information to be broadcast into voice before broadcasting; the signal transmission power of the LDSW transmitter will be determined according to the size of its signal coverage; the LDSW transmitter is further divided into an LDSW speaker tag installed on a broadcast tower, which uses a large transmission power to connect the broadcast speaker within its signal coverage only when necessary, an LDSW transmitter that transmits digital signal work instruction signals in a one-way manner, and an LDSW transmitter installed on a village or urban community broadcasting station with the ability to conduct two-way communication with an LDSW intercom. Since the latter requires two-way communication with the intercom, the power of the LDSW transmitter is limited; or it is an LDSW intercom that can perform the LDSW transmitter task and can be moved. Because the LDSW intercom here has built-in LDSW speaker tags and LDSW transmitters, it can take on the work of both LDSW transmitters and LDSW speaker tags. LDSW intercoms can be used for both voice intercom communications and text message exchanges. Most intercoms operate on the 433 MHz public frequency band or on emergency communication channels below 1G (Gsub-G) to achieve longer distance transmission, especially LDSW transmitters installed in village and town radio stations. See Figure 3 .

[0029] Because the urban community broadcasting stations are relatively dense, the communication distance requirement is not high, but there are relatively many people who need to communicate with the LDSW transmitter for emergency, so it is reasonable and necessary to increase the use of 2.4G LDSW transmitters. Figure 4 .

[0030] At this time, we only need to use a simple 2.4G plug-in (similar to a Bluetooth plug-in) that can be carried with us, and install an APP that matches the plug-in in our smartphones. The smartphones we carry with us will become an LDSW intercom in an emergency. They can communicate wirelessly in voice and text without relying on mobile networks. In addition, it should be noted that the LDSW transmitter we are talking about here does not mean that it only does the work of transmitting signals. It also has the function of receiving LDSW signals, which can at least be achieved by time division. The wireless communication between the LDSW transmitter and the LDSW speaker tag includes at least the following working methods: that is, when the LDSW transmitter is required to send an emergency broadcast digital signal, the LDSW transmitter will continuously and repeatedly transmit the work instruction signal packet for a period of time greater than the sleep wake-up cycle of the LDSW speaker tag, and seize the moment when the LDSW speaker tag monitors the sleep wake-up signal to establish communication with it, convey the work instruction task to it, and transmit the specific text information content that it needs to broadcast to it when necessary. The LDSW speaker tag is usually in a periodic sleep state. After waking up, it will listen to the work instruction signal from the LDSW transmitter for a moment in a low-power standby state; the LDSW speaker tag will use this moment to listen to the RF signal from the outside world. In order to save power, the length of this moment should be as short as possible, but it must be ensured that the LDSW speaker tag can use the RF signal listened to at this moment to determine whether the signal meets the communication frequency, modulation method, encoding method or address code required for it to establish wireless communication with the LDSW transmitter. Part or all of the requirements; if it meets the requirements, the LDSW speaker tag will extend the receiving time to receive a complete digital signal package that has been verified; if it does not meet the requirements, the LDSW tag will immediately enter a low-power sleep state and wait for the next signal listening moment. See the CCSA communication industry standard "Technical Requirements for Low Duty Cycle IoT Smart Label Communication System".

[0031] In the system of this embodiment, all broadcast receiving devices equipped with LDSW speaker tags, including pocket radios, must, under any circumstances, at least have the battery power required to maintain the LDSW speaker tag's periodic sleep-wake monitoring and to be able to execute working instructions from the LDSW transmitter.

[0032] The transmitter installed at the broadcasting station in the village or town with low population density, which has the ability to communicate with LDSW intercom in two directions, uses the lower communication frequency of 433 MHz or the dedicated emergency communication frequency band to achieve a longer communication distance; while the LDSW transmitter installed in the community broadcasting center in the densely populated city will add an additional LDSW transceiver working on the 2.4G frequency band to communicate with LDSW intercom working on the 2.4G frequency band, as well as LDSW smart student card / senior card, to meet the more intensive communication needs within a limited distance. The LDSW smart student card and senior card here are low-power identity cards that can communicate with two designated objects using WeChat short voice only in emergency situations.

[0033] Considering the cost and the actual situation of emergency relief, we can only connect a satellite two-way communication module to the LDSW transmitter installed at some broadcasting sites in villages, towns or urban communities. In this way, when the mobile network is interrupted, the staff can use the LDSW walkie-talkie to upload the specific situation related to the disaster in the area to the remote emergency command center.

[0034] The method for inputting and outputting displaying text information of the LDSW walkie-talkie here includes the identity information of the LDSW walkie-talkie, the satellite coordinate position information generated by the built-in satellite positioning module, the pre-defined digital code information representing different text contents, or the text information input or displayed by the LDSW walkie-talkie through the built-in text information input and output display module. In addition, the built-in Bluetooth module can also be used to establish a wireless communication connection with a smart phone, and the smart phone can be used to realize the functions of text information editing and output display, including the electronic map required for satellite positioning.

[0035] This embodiment also provides a simple, effective and low-cost working method for an emergency broadcast communication system; this method utilizes the ultra-low power consumption and ultra-long-distance sleep wake-up functions of the new generation of narrowband Internet of Things communication technology of LDSW, as well as the high position of the antenna of the transmission tower of the existing broadcast system, high transmission power, and wide coverage of one-way broadcast signals, especially the advantage of being able to achieve longer-distance signal coverage when using low-rate broadcast digital text information. This embodiment method, by starting the high-power transmitter installed on the transmission tower of the radio station only in an emergency, transmits a long-distance wake-up work instruction signal to wake up various emergency broadcast devices that are usually in a low-power sleep state or a certain working state within the signal coverage range, including portable pocket radios and LDSW intercoms, as well as fixed indoor household small speakers and outdoor broadcast large speakers, so that they can immediately enter the working state of receiving and broadcasting alarm information when any emergency occurs, which greatly reduces the construction and maintenance costs of the system and reduces the impact of the emergency system on the daily lives of the general public.

[0036] The immediately entering working state of broadcasting alarm information mentioned here means that after the LDSW speaker tag is awakened and receives the working instruction, it will immediately turn on the pocket radio that people carry with them, or the large broadcast speaker connected to the village radio station radio, so that it can immediately broadcast the voice alarm information broadcast from the radio station; or after the LDSW speaker tag receives the digital text working instruction broadcast from the LDSW transmitter, including the text information content that needs to be broadcast, the text content to be broadcast will be played in the form of voice through the text-to-speech function module connected to the LDSW speaker tag.

[0037] In order to solve the problem of uploading local disaster-related information to a remote command and control center, or conveying disaster-related information and command and dispatch work instructions to every citizen in the area who is related to the disaster. The method of this embodiment also adopts a method of establishing an LDSW gateway base station in a local village or urban community that can at least communicate two-way with an LDSW walkie-talkie, and can also communicate two-way with a satellite when necessary. Authorized emergency rescue workers can use the LDSW walkie-talkie they carry with them to broadcast and convey various information related to local emergency rescue to various LDSW speaker tags within the signal coverage range at any time through the LDSW gateway base station, or upload various information related to local emergency rescue to a remote emergency rescue command center through an LDSW gateway base station with a satellite two-way communication function.

[0038] The LDSW gateway base stations built in villages, towns and urban communities here also have the functions of both peacetime and emergency. For many remote towns, it is a simple communication system that can be used in normal times; for cities, it is a narrowband Internet of Things that can improve the level of urban intelligent management.

[0039] In addition, in order to facilitate the general public, we can also integrate the functions of LDSW walkie-talkie and LDSW pocket radio (two into one), making it an LDSW walkie-talkie with radio function, or an LDSW radio with LDSW walkie-talkie function.

[0040] Various devices in the emergency broadcast communication system of this embodiment, including radios, intercoms, etc., can be used normally, but they must stop existing work and enter the state of receiving emergency alarm information when receiving the LDSW alarm work instruction. And all emergency broadcast equipment connected to the LDSW speaker tag must retain power at least enough to maintain the LDSW tag's periodic sleep and wake-up to monitor the signal for a moment, and to monitor the emergency broadcast work instruction signal and perform the emergency broadcast work task when in normal use.

[0041] Through the above scheme, the LDFSW emergency broadcast communication system and working method provided by this embodiment is a simple, low-cost and practical solution independently developed in view of the frequent occurrence of various disasters in my country and the world in recent years, and the fact that my country's existing emergency communication means are not only expensive but also out of touch with reality. It takes into account the current actual situation in my country, especially the actual situation in the vast rural areas, and makes full use of the favorable conditions of my country's existing broadcast communication facilities, as well as the principle of dual use for peace and emergency. It can not only basically solve the problem of emergency broadcasting and communication in my country's current emergency rescue work, but also can be promoted abroad, especially to developing countries and regions. Therefore, its benefits are very significant.

[0042] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. LDSW emergency broadcast communication system, characterized in that: The system includes at least one regional emergency rescue command and control center, one or more LDSW transmitters transmitting LDSW narrowband digital signals, and one or more LDSW speaker tags connected to voice playback speakers; they all have unique identity codes or regional group codes; wireless narrowband digital communication with the identity code or group code as the receiving address can be carried out between the transmitter and the LDSW speaker tag; they can be installed in fixed locations or installed or placed on mobile carriers such as vehicles, drones, ships and people; the LDSW speaker tag can be connected to a pocket radio or other radio carried by people, or to a fixed radio installed indoors. The LDSW speaker tag is usually in a low-power state of periodic sleep and listens to the working command signal from the transmitter for a moment after waking up, and has the function of converting the received digital text information into voice and playing it through the speaker connected to it; the LDSW transmitter does not work normally and is only started in an emergency. Its task at least includes one-way broadcasting of LDSW digital signals to all target LDSW speaker tags within its signal coverage range, issuing commands requiring the connected radio to start receiving emergency broadcasts on the emergency broadcast channel, or requiring L The DSW speaker tag turns on the speaker connected to it, converts the received digital text information to be broadcast into voice and then broadcasts it; the signal transmission power of the LDSW transmitter will be determined according to the size of its signal coverage; the LDSW transmitter is divided into an LDSW speaker tag installed on a broadcast tower, which uses a large transmission power to connect to the broadcast speaker within its signal coverage only when needed, an LDSW transmitter that transmits digital signal work instruction signals in one direction, and an LDSW transmitter installed on a broadcast station in villages, towns, urban communities or intersections, which has the ability to communicate with LDSW walkie-talkies in two directions, or is just a A portable LDSW intercom that can perform the LDSW transmitter task; the LDSW intercom described here has built-in LDSW speaker tags and LDSW transmitters, so it can undertake the work of both LDSW transmitters and LDSW speaker tags; the LDSW intercom can perform voice intercom communications and text information exchanges; it can work on sub-G wireless frequency bands and on other frequency bands such as 2.4G; the LDSW intercom can also be composed of a mobile phone plug-in and a general smart phone, and wireless voice and text communications can be performed between them without relying on mobile networks.

2. The LDSW emergency broadcast communication system according to claim 1, characterized in that: The wireless communication between the LDSW transmitter and the LDSW horn tag includes at least the following working mode: when the LDSW transmitter is required to send an emergency broadcast digital signal, the LDSW transmitter will continuously and repeatedly transmit the work instruction signal packet within a period of time greater than the sleep-wake cycle of the LDSW horn tag, and seize the moment when the LDSW horn tag sleeps and wakes up to monitor the signal to establish communication with it, convey the work instruction task to it, and transmit the specific text information content that it needs to broadcast to it when necessary; while the LDSW horn tag is usually in periodic sleep, and after waking up, it monitors the work instruction signal from the LDSW transmitter for a moment. The LDSW speaker tag will use this moment to monitor the RF signal from the outside world. The length of this moment should be as short as possible, but it must be ensured that the LDSW speaker tag can use the monitored RF signal to determine whether the signal meets the communication frequency, modulation method, encoding method or address code required to establish wireless communication with the LDSW transmitter. Part or all of the requirements, if it meets the requirements, the LDSW speaker tag will extend the receiving time to receive a verified complete digital signal package; if it does not meet the requirements, the LDSW tag will immediately enter a low-power sleep state and wait for the next signal monitoring moment.

3. The LDSW emergency broadcast communication system according to claim 2, characterized in that: All broadcast receiving equipment equipped with LDSW speaker tags, including pocket radios, must, in any case, at least be guaranteed to have the power required to maintain the LDSW speaker tag's periodic sleep-wake monitoring and be able to execute working instructions from the LDSW transmitter.

4. The LDSW emergency broadcast communication system according to claim 1, characterized in that: The transmitter installed at the radio station in villages and towns with low population density and having at least the ability to conduct two-way communication with LDSW walkie-talkies adopts a lower communication frequency of 433 MHz or a dedicated emergency communication frequency band to achieve a longer communication distance; and the LDSW transmitter installed in the community radio center in densely populated cities will additionally add an LDSW transceiver working on the 2.4G frequency band to communicate with the LDSW walkie-talkies working on the 2.4G frequency band and the LDSW smart student card / senior citizen card to meet the more intensive communication needs within a limited distance.

5. The LDSW emergency broadcast communication system according to claim 1, characterized in that: The LDSW transmitter installed on part or all of the broadcasting sites in villages, towns or urban communities is also connected to a satellite two-way communication module and a mobile network terminal module, so that it can communicate with the outside world through the mobile public network under normal circumstances; in the event of a mobile network interruption, the local disaster situation can also be uploaded to a remote emergency command and control center through the satellite communication module.

6. The LDSW emergency broadcast communication system according to claim 1, 3, 4, or 5, characterized in that: The method for inputting and outputting display text information of the LDSW intercom includes the identity information of the LDSW intercom, the satellite coordinate position information generated by the satellite positioning module of the LDSW intercom, the digital code information pre-defined to represent different text contents, or the text information generated or displayed by the LDSW intercom through the text information input and output display module of the LDSW intercom, and the wireless communication connection established with the smart phone by the Bluetooth module of the LDSW intercom can be used to realize the function of editing and displaying text information by using the smart phone.

7. The working method of the LDSW emergency broadcast communication system is characterized in that: It utilizes the ultra-low power consumption and ultra-long-distance sleep and wake-up functions of the new generation of narrowband IoT communication technology of LDSW, as well as the high position of the antenna of the existing broadcasting system transmission tower, large transmission power, and wide coverage of one-way broadcast signals, especially the advantage of being able to achieve longer-distance signal coverage when broadcasting digital text information at a low rate; and only in an emergency, temporarily start the high-power LDSW narrowband wireless signal emergency broadcast transmitter installed on the transmission tower, and by transmitting a long-distance wake-up work command signal, various emergency broadcasting devices that are usually in a low-power sleep state or a certain working state within the signal coverage range, including movable LDSW pocket radios and LDSW intercoms, as well as fixed indoor small household loudspeakers and outdoor large broadcast loudspeakers, are awakened. When any emergency occurs, they can immediately enter the working state of receiving and broadcasting alarm information; the immediate entry into the working state of broadcasting alarm information here means that after the LDSW speaker tag is awakened and receives the alarm working instruction, it will immediately send out a voice alarm signal, and turn on the pocket radio that people carry with them, or the large broadcast speaker connected to the village radio station radio, so that it can immediately receive and broadcast the voice alarm information broadcast from the radio station; or after the LDSW speaker tag receives the digital text working instruction broadcast from the LDSW transmitter, including the text information content that needs to be broadcast, the text content that needs to be broadcast will be played out in the form of voice through the text-to-speech function module connected to the LDSW speaker tag.

8. The LDSW emergency broadcast communication system working method according to claim 7, characterized in that: In order to solve the problem of uploading local disaster-related information to a remote command and control center, or conveying disaster-related information and command and dispatch work instructions to every citizen in the area who is related to the disaster, the method of the present invention also adopts a method of establishing an LDSW gateway base station in a local village or urban community that can at least communicate with an LDSW walkie-talkie in two directions and is connected to a mobile network terminal and a satellite two-way communication module, so that authorized emergency rescue workers can use the LDSW walkie-talkie they carry with them to contact the outside world through the mobile network terminal at ordinary times, and can also contact the outside world through the satellite two-way communication terminal when the mobile network is interrupted; at the same time, he can also broadcast and convey various information related to local emergency rescue at any time through the LDSW gateway base station to various LDSW speaker tags within its signal coverage area.

9. The LDSW emergency broadcast communication system working method according to claim 7, characterized in that: The LDSW intercom and the LDSW pocket radio can be combined into one, forming a LDSW intercom with radio function or a LDSW radio with LDSW intercom function.

10. The LDSW emergency broadcast communication system working method according to claim 8, characterized in that: Only when an emergency occurs, the emergency broadcast communication equipment connected to the LDSW speaker tag, which is usually in an ultra-low power sleep state or a certain working state, is started to enter the emergency working state by waking up the LDSW speaker tag; any equipment connected to the LDSW tag for emergency broadcast communication, including radios, walkie-talkies, etc., can also be used normally, but when receiving the LDSW alarm work instruction, they will stop working and enter the state of receiving emergency alarm information, and all emergency broadcast equipment connected to the LDSW speaker tag must retain at least the power required to maintain the LDSW tag's periodic sleep and wake-up signal monitoring moment, and to monitor the emergency broadcast work instruction signal and perform the emergency broadcast work task.

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