CN117676532A - Emergency broadcast adapter and method based on direct broadcast satellite channel transmission data - Google Patents
Emergency broadcast adapter and method based on direct broadcast satellite channel transmission data Download PDFInfo
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Abstract
The invention discloses an emergency broadcast adapter and a method based on direct broadcast satellite channel transmission data, wherein the emergency broadcast adapter comprises a decoding unit for decoding received direct broadcast satellite signals to obtain a digital decoding result and sending the decoding result to an SOC module; the SOC module converts the decoding result into a first decoding result matched with the medium wave format, a second decoding result matched with the frequency modulation format and a third decoding result matched with the DTMB format respectively; the SOC module converts the first decoding result and the second decoding result into analog signals through the modulation unit, and then sends the analog signals to the medium-wave amplitude modulation transmitter port and the frequency modulation transmitter port respectively, and the third decoding result is directly sent to the DTMB exciter port. Under the condition of not depending on a mobile communication network, the acquired direct broadcast satellite signals are subjected to emergency broadcasting in different forms based on satellite reception through an emergency broadcasting adapter based on direct broadcast satellite channel transmission data, so that the safety of social public resources and lives and properties of people is ensured.
Description
Technical Field
The invention relates to the technical field of emergency broadcasting, in particular to an emergency broadcasting adapter and an emergency broadcasting method based on direct broadcast satellite channel transmission data.
Background
Emergency broadcasting is used as a rapid message providing platform and an information transmission channel, and when sudden public crisis such as major natural disasters, sudden events, public health, social security and the like, disaster messages or possibly caused hazard information can be transmitted to people at the first time so as to minimize the loss of social public resources and lives and property of people.
In the emergency broadcasting system construction engineering which has been widely implemented at present, the traditional wired broadband and 4G network become the main channels of emergency broadcasting messages, but the fact that when severe natural disasters such as earthquakes occur, the probability of damaging optical fibers is high, and signals of the receiving channels based on IP are easily interrupted, so that the emergency broadcasting messages cannot be timely and accurately sent out in emergency situations must also be considered.
Disclosure of Invention
The invention provides an emergency broadcast adapter and an emergency broadcast method based on direct broadcast satellite channel transmission data, which are used for realizing emergency broadcast of direct broadcast satellite signals.
According to an aspect of the present invention, there is provided an emergency broadcast adapter for transmitting data based on a direct broadcast satellite channel, including: the system-on-chip SOC module is connected with the decoding unit and the audio switching unit respectively;
the decoding unit is used for decoding the received direct broadcast satellite signals to obtain digital decoding results and sending the decoding results to the SOC module, wherein the decoding results comprise emergency broadcast instructions and audio data;
the SOC module is used for respectively converting the decoding result into a first decoding result matched with a medium wave format, a second decoding result matched with a frequency modulation format and a third decoding result matched with a terrestrial digital multimedia broadcasting (DTMB) format;
the SOC module is also used for switching entertainment audio and emergency broadcasting audio through the audio switching unit, converting the first decoding result and the second decoding result into analog signals through the modulation unit, then respectively transmitting the analog signals to a medium-wave amplitude modulation transmitter port and a frequency modulation transmitter port, and directly transmitting the third decoding result to a DTMB exciter port.
According to another aspect of the present invention, there is provided an emergency broadcast method based on direct broadcast satellite channel transmission data, which is applied to the emergency broadcast adapter based on direct broadcast satellite channel transmission data according to any one of the above embodiments, including:
decoding the received direct broadcast satellite signals through a decoding unit to obtain digital decoding results, and sending the decoding results to the SOC module, wherein the decoding results comprise emergency broadcast instructions and audio data;
converting the decoding result into a first decoding result matched with a medium wave format, a second decoding result matched with a frequency modulation format and a third decoding result matched with a terrestrial digital symbol media broadcast DTMB format through an SOC module;
and controlling an audio switching unit to switch the audio through the SOC module, converting the first decoding result and the second decoding result into analog signals through a modulation unit, respectively transmitting the analog signals to a medium-wave amplitude modulation transmitter port and a frequency modulation transmitter port, and directly transmitting the third decoding result to a DTMB exciter port.
According to the technical scheme, under the condition of not depending on a mobile communication network, the acquired live broadcast satellite signals can be subjected to emergency broadcasting in different forms based on satellite reception through the live broadcast channel-based emergency broadcasting adapter, so that the safety of social public resources and lives and properties of people is guaranteed.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an emergency broadcast adapter based on direct broadcast satellite channel transmission data according to a first embodiment of the present invention;
fig. 2 is a flowchart of an emergency broadcasting method based on direct broadcast satellite channel transmission data according to a second embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, "comprises," "comprising," and "having" and any variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or terminal that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or terminal.
Example 1
Fig. 1 is a schematic structural diagram of an emergency broadcast adapter based on live broadcast satellite channel transmission data according to an embodiment of the present invention, where the embodiment is applicable to a situation of performing emergency broadcast on a received live broadcast satellite signal, as shown in fig. 1, the emergency broadcast adapter based on live broadcast satellite channel transmission data includes: a system-on-chip SOC module 11, a decoding unit 12 and an audio switching unit 13 connected to the SOC module 11, respectively.
The decoding unit is used for decoding the received direct broadcast satellite signals to obtain digital decoding results and sending the decoding results to the SOC module, wherein the decoding results comprise emergency broadcast instructions and audio data;
the SOC module is used for respectively converting the decoding result into a first decoding result matched with the medium wave format, a second decoding result matched with the frequency modulation format and a third decoding result matched with the terrestrial digital multimedia broadcasting DTMB format;
the SOC module is also used for switching entertainment audio and emergency broadcasting audio through the audio switching unit, converting the first decoding result and the second decoding result into analog signals through the modulation unit, then respectively transmitting the analog signals to the medium-wave amplitude modulation transmitter port and the frequency modulation transmitter port, and directly transmitting the third decoding result to the DTMB exciter port.
Optionally, the decoding unit is configured to receive and decode the direct broadcast satellite signal sent by the emergency broadcast platform through the direct broadcast satellite based on a specified satellite channel, so as to obtain the emergency broadcast instruction and the audio data, where the emergency broadcast instruction includes: region trigger descriptor: for indicating on/off-air instructions and emergency broadcast areas; EMM emergency broadcast instructions: an emergency broadcast message for indicating emergency broadcast channel information, effective time, version number; satellite channel information: the direct broadcast satellite channel is used for indicating an emergency broadcasting state and a signal locking state of the satellite channel, and when the emergency broadcasting state is not in the emergency broadcasting state and the signal locking state is the locking state, the direct broadcast satellite channel can be used as an emergency broadcasting channel to transmit emergency broadcasting information.
Optionally, the triggering mode of the decoding unit includes: the area code triggering mode adopts area codes to address decoding units, so that emergency broadcasting is triggered to the decoding units of the adapters in the designated area; and/or, the smart card number triggering mode adopts the smart card number to address the decoding unit, so that the decoding unit of the designated adapter is triggered to perform emergency broadcasting.
Specifically, the decoding unit of the embodiment can be automatically triggered to perform emergency broadcasting in both a start-up state and a standby state, and the triggering mode comprises two modes of area code triggering and smart card number triggering: the area code triggering adopts area code to address the decoding unit, so that the emergency broadcasting is triggered to the decoding unit of the adapter in the appointed area; the smart card number triggers the decoding unit addressing by adopting the smart card number, so that the emergency broadcasting is triggered to the decoding unit of the appointed adapter.
In one specific implementation, the decoding unit emergency broadcast region code triggering processing flow is as follows: the decoding unit monitors and acquires an emergency broadcast descriptor with the identification number of 0x87 from the direct broadcast satellite signal, if the version number of the descriptor is not 0x00 and is inconsistent with the version number of the descriptor stored by the decoding unit, the decoding unit analyzes the descriptor, then judges whether the matching bit number of the adapter takes a value of 1-8 according to a matching rule, if not, the follow-up operation is not carried out; if so, matching the region code in the descriptor with the region code stored in the decoding unit, if the matching is successful, responding to emergency broadcasting, simultaneously storing the version number of the descriptor into a memory, and if the matching is unsuccessful, continuing to monitor the network information table by the decoding unit. For example, the matching rule in this embodiment may be that the target adapter determines the number of matching bits by the match_number field in the network information table when performing region code matching. The matching rule is to match the local region code bit by bit from the high order, and the matching bit number is determined by the match_number. For example: the issued region code is 44110000, the region code of the decoding unit is 447000and the match_number is 4, 4 bits are matched from the high bit by bit, and the matching is successful; but if the match_number is 5, the match is unsuccessful. When the region code is 00000000 and the match_number is 8, all triggers are indicated. Of course, this embodiment is merely an example, and the specific content of the matching rule related to the region code trigger method is not limited thereto.
In the emergency broadcast adapter, the decoding unit triggers the emergency broadcast through the 'region coding trigger processing flow', and the decoding unit of fig. 1 transmits 'region trigger descriptor field', 'EMM emergency broadcast instruction field', and 'satellite channel information field' and other emergency broadcast instructions to the SOC module through the 'signaling interaction channel', and the SOC module completes 'emergency broadcast display under start/standby state' and 'emergency broadcast suspension mechanism'. Specifically, the emergency broadcast instruction includes: region trigger descriptor: for indicating on/off-air instructions and emergency broadcast areas; EMM emergency broadcast instructions: an emergency broadcast message for indicating emergency broadcast channel information, effective time, version number; satellite channel information: the direct broadcast satellite channel is used for indicating an emergency broadcasting state and a signal locking state of the satellite channel, and when the emergency broadcasting state is not in the emergency broadcasting state and the signal locking state is the locking state, the direct broadcast satellite channel can be used as an emergency broadcasting channel to transmit emergency broadcasting information. Of course, the present embodiment is merely an example, and the specific content included in the emergency broadcast instruction is not limited thereto.
In another specific implementation, the decoding unit emergency broadcasting smart card number triggering processing flow is as follows: the front-end system sends an EMM emergency broadcasting instruction to a decoding unit of the appointed smart card number, and if the appointed decoding unit analyzes that the instruction version number changes and is not 0x00, the decoding unit automatically jumps to the appointed emergency broadcasting channel at the appointed time. The emergency broadcast triggered by the smart card number supports immediate triggering and reservation triggering. The effective time in the emergency broadcasting smart card number triggering instruction is equal to or earlier than the emergency broadcasting of the current time; the emergency broadcast with the effective time later than the current time is reserved and triggered, and the decoding unit is switched to the appointed emergency broadcast channel after the effective time is reached.
Optionally, the adapter further includes a signal detection unit 14, where the signal detection unit is connected to the decoding unit; and the signal detection unit is used for monitoring signals of the designated satellite channel, checking the direct broadcast satellite signal when the direct broadcast satellite signal is determined to exist, and transmitting the direct broadcast satellite signal to the decoding unit when the direct broadcast satellite signal is determined to pass the checking.
Specifically, the adapter in this embodiment may be in communication connection with the emergency broadcast platform through a direct broadcast satellite, where the direct broadcast satellite may specifically be a satellite No. 9, and of course, this embodiment is only illustrative, and as long as the emergency broadcast information of the emergency broadcast platform can be forwarded, the adapter is within the protection scope of this application, and the specific type of the direct broadcast satellite is not limited in this embodiment. When an emergency situation occurs, such as a geological disaster like an earthquake, the emergency broadcast platform can send a direct broadcast satellite signal to the adapter through the direct broadcast satellite, and the direct broadcast satellite signal comprises an emergency broadcast message and an emergency broadcast audio signal. In this embodiment, a designated satellite channel adopted by the direct broadcast satellite and the adapter for communication is preconfigured, so that the signal detection unit in the adapter periodically performs signal detection on the designated satellite channel, and after determining that the direct broadcast satellite signal sent by the direct broadcast satellite exists, in order to avoid interference caused by an external hacker, the received direct broadcast satellite signal is checked to ensure the security of the received direct broadcast satellite signal, and a manner of encryption check or signature check may be adopted in the security check. When the fact that the safety verification of the direct broadcast satellite signal is not passed is determined, the fact that the received direct broadcast satellite signal is possibly tampered is indicated, and at the moment, the direct broadcast satellite signal is deleted and is not transmitted to the decoding unit, so that accuracy of emergency broadcasting is guaranteed.
After receiving the direct broadcast satellite signal, the decoding unit in the embodiment performs descrambling and demultiplexing on the emergency broadcast message and the emergency broadcast audio signal in the direct broadcast satellite signal respectively to obtain an emergency broadcast instruction and audio data, takes the emergency broadcast instruction and the audio data obtained by decoding as decoding results, takes the decoding results in a digital form at the moment, and sends the decoding results in the digital form to the SOC module.
Optionally, the SOC module is configured to, when determining that the emergency broadcast instruction is an on-air instruction, convert the emergency broadcast instruction in the decoding result into a first emergency broadcast instruction matched with the medium-wave format, a second emergency broadcast instruction matched with the frequency modulation format, and a third emergency broadcast instruction matched with the DTMB format, respectively.
Optionally, the SOC module is further configured to convert the digital audio data in the decoding result into analog audio data, and send the analog audio data to the medium-wave amplitude modulation transmitter port and the frequency modulation transmitter port through the audio switching unit, respectively.
Optionally, the SOC module is further configured to send the third emergency broadcast instruction and the audio data in digital form directly to the DTMB exciter port.
Optionally, the adapter further comprises a medium wave modulation unit and a frequency modulation unit, the medium wave modulation unit is respectively connected with the SOC module and the medium wave amplitude modulation transmitter port, and the frequency modulation unit is respectively connected with the SOC module and the frequency modulation transmitter port. The medium wave modulation unit is used for modulating the first emergency broadcasting instruction to obtain a simulated first emergency broadcasting instruction and transmitting the simulated first emergency broadcasting instruction to a medium wave amplitude modulation transmitter port; the frequency modulation unit is used for modulating the second emergency broadcast to obtain an analog second emergency broadcast instruction and transmitting the analog second emergency broadcast instruction to the frequency modulation transmitter port.
Specifically, the adapter in this embodiment adopts three modes of medium wave amplitude modulation (Amplitude Modulation, AM), frequency modulation (Frequency Modulation, FM) and terrestrial digital multimedia broadcasting (Digital Terrestrial Multimedia Broadcast, DTMB) to broadcast, and the medium wave AM and FM are mainly broadcast according to analog signals, but the DTMB can be modulated into analog signals by using an additional third party device, and the adapter in this embodiment only needs to complete the conversion of the analog signals of the medium wave amplitude modulation and frequency modulation. The SOC module in this embodiment identifies the emergency broadcast instruction through the emergency broadcast instruction, and when determining that the emergency broadcast instruction is an on-air instruction, the emergency broadcast instruction is respectively converted into a first emergency broadcast instruction matched with a medium wave format, a second emergency broadcast instruction matched with a frequency modulation format and a third emergency broadcast instruction matched with a DTMB format, that is, conversion of a signal digital format is first performed, then the first emergency broadcast instruction is subjected to LDPC encoding, then the first emergency broadcast instruction is modulated into a simulated first emergency broadcast instruction by using MSK through a medium wave modulation unit, and is sent to a medium wave amplitude modulation transmitter port, and meanwhile, the second emergency broadcast instruction is subjected to manchester encoding, and then modulated into a simulated second emergency broadcast instruction by using BPSK through a frequency modulation unit, and is sent to a frequency modulation transmitter port. The emergency broadcasting instructions with the adaptive format are respectively obtained from the medium wave amplitude modulation transmitter port and the frequency modulation transmitter port through the processing, and the emergency broadcasting instructions comprise instruction information such as broadcasting areas, broadcasting time and the like.
In the implementation of medium-wave and frequency modulation emergency broadcasting, the medium-wave amplitude modulation transmitter port and the frequency modulation transmitter port not only need the emergency broadcasting instruction with the adapted format, but also need specific broadcasting content, namely analog audio data, so that effective emergency broadcasting can be implemented. Therefore, the SOC module in this embodiment converts the digital audio data into analog audio data, and then uses the built-in audio switching unit to switch to the medium-wave amplitude modulation audio output channel or the frequency modulation audio output channel, for example, when it is determined that the medium-wave amplitude modulation broadcasting is currently being performed, and the audio switching unit is currently using the common audio channel to perform entertainment audio broadcasting, when receiving the analog audio data, it switches to the medium-wave amplitude modulation audio output channel and sends the analog audio data to the medium-wave amplitude modulation transmitter port. After the transmission of the analog first emergency broadcasting instruction and the analog audio data is completed, the medium-wave amplitude modulation transmitter port feeds back a playing completion instruction to the audio switching unit, and at the moment, the audio switching unit switches to a common audio output channel again after receiving the playing completion instruction. Therefore, the adapter in this embodiment also supports playing local audio sources, such as a usb disk or a microphone for shouting, so as to generate an emergency broadcast control signal, and outputs the emergency broadcast control signal and analog audio data together to the opening of the medium-wave amplitude modulation transmitter end for broadcast coverage. In addition, when it is determined that frequency modulation broadcasting is currently being performed, and the audio switching unit is currently performing entertainment audio broadcasting using a general audio channel, analog audio data is synchronously switched to the frequency modulation audio output channel and transmitted to the frequency modulation transmitter port after being received. After the frequency modulation transmitting port transmits the simulated second emergency broadcasting instruction and the simulated audio data, the frequency modulation transmitting port feeds back a playing completion instruction to the audio switching unit, and at the moment, the audio switching unit switches to the common audio output channel again after receiving the playing completion instruction. In addition, the adapter also supports the playing of local audio in the fm broadcast scene, and in this embodiment, no description will be given.
It should be noted that, since the adapter of the present embodiment does not support digital-to-analog conversion in the DTMB broadcasting scenario, the SOC module will directly send the third emergency broadcasting instruction and the digital audio data to the DTMB exciter port. And the DTMB exciter port is used for transmitting the audio data in a digital form and the third emergency broadcasting instruction to third equipment for digital-to-analog conversion, receiving a data conversion result of the third party equipment, and transmitting the converted analog audio data and the analog third emergency broadcasting instruction to terminal equipment in a coverage range through a DTMB transmitting station. The wave transmitter port in this embodiment is configured to send the analog audio data and the analog first emergency broadcast instruction to the terminal device in the coverage area through the medium wave transmitting station; and the frequency modulation transmitter port is used for transmitting the analog audio data and the analog second emergency broadcast instruction to terminal equipment in the coverage range through the frequency modulation transmitting station.
When the adapter broadcasts by adopting medium-wave amplitude modulation, frequency modulation or DTMB, the adapter specifically transmits the medium-wave amplitude modulation signal to the terminal device in the coverage area through the corresponding transmitting station in each broadcasting mode, for example, the medium-wave amplitude modulation signal transmitter port is used for transmitting the analog audio data and the analog first emergency broadcasting instruction to the terminal device in the coverage area through the medium-wave transmitting station.
According to the technical scheme, under the condition of not depending on a mobile communication network, the acquired live broadcast satellite signals can be subjected to emergency broadcasting in different forms based on satellite reception through the live broadcast channel-based emergency broadcasting adapter, so that the safety of social public resources and lives and properties of people is guaranteed.
Example two
Fig. 2 is a flowchart of an emergency broadcasting method based on direct broadcast satellite channel transmission data, which is provided in an embodiment of the present invention, and the embodiment is applied to the emergency broadcasting adapter based on direct broadcast satellite channel transmission data, so as to perform emergency broadcasting based on direct broadcast satellite channel transmission data. As shown in fig. 2, the method includes:
in step S201, the received direct broadcast satellite signal is decoded by the decoding unit to obtain a digital decoding result, and the decoding result is sent to the SOC module.
Specifically, the adapter in this embodiment may be in communication connection with the emergency broadcast platform through a direct broadcast satellite, where the direct broadcast satellite may specifically be a satellite No. 9, and of course, this embodiment is only illustrative, and as long as the emergency broadcast information of the emergency broadcast platform can be forwarded, the adapter is within the protection scope of this application, and the specific type of the direct broadcast satellite is not limited in this embodiment. When an emergency situation occurs, such as a geological disaster like an earthquake, the emergency broadcast platform can send a direct broadcast satellite signal to the adapter through the direct broadcast satellite, and the direct broadcast satellite signal comprises an emergency broadcast message and an emergency broadcast audio signal. In this embodiment, a designated satellite channel adopted by the direct broadcast satellite and the adapter for communication is preconfigured, so that the signal detection unit in the adapter periodically performs signal detection on the designated satellite channel, and after determining that the direct broadcast satellite signal sent by the direct broadcast satellite exists, in order to avoid interference caused by an external hacker, the received direct broadcast satellite signal is checked to ensure the security of the received direct broadcast satellite signal, and a manner of encryption check or signature check may be adopted in the security check. When the fact that the safety verification of the direct broadcast satellite signal is not passed is determined, the fact that the received direct broadcast satellite signal is possibly tampered is indicated, and at the moment, the direct broadcast satellite signal is deleted and is not transmitted to the decoding unit, so that accuracy of emergency broadcasting is guaranteed.
After receiving the direct broadcast satellite signal, the decoding unit in the embodiment performs descrambling and demultiplexing on the emergency broadcast message and the emergency broadcast audio signal in the direct broadcast satellite signal respectively to obtain an emergency broadcast instruction and audio data, takes the emergency broadcast instruction and the audio data obtained by decoding as decoding results, takes the decoding results in a digital form at the moment, and sends the decoding results in the digital form to the SOC module. Wherein the decoding result includes an emergency broadcast instruction and audio data.
Step S202, converting the decoding result into a first decoding result matched with the medium wave format, a second decoding result matched with the frequency modulation format and a third decoding result matched with the terrestrial digital multimedia broadcasting DTMB format through the SOC module.
Specifically, the adapter in this embodiment adopts three modes of medium wave amplitude modulation (Amplitude Modulation, AM), frequency modulation (Frequency Modulation, FM) and terrestrial digital media broadcasting (Digital Terrestrial Multimedia Broadcast, DTMB), and the medium wave AM and FM are mainly broadcast according to analog signals, but digital-to-analog conversion of DTMB can be modulated into analog signals by using additional third party equipment, and the adapter in this embodiment only needs to complete the conversion of the medium wave and frequency modulated analog signals. The SOC module in this embodiment identifies the emergency broadcast instruction by identifying the emergency broadcast instruction according to the application scenario of the medium waves AM and FM, and when determining that the emergency broadcast instruction is an on-air instruction, converts the emergency broadcast instruction into a first emergency broadcast instruction matched with the medium wave format, a second emergency broadcast instruction matched with the frequency modulation format, and a third emergency broadcast instruction matched with the DTMB format, that is, converts the signal digital form into the digital form.
Step S203, the SOC module controls the audio switching unit to switch entertainment audio and emergency broadcasting audio, the modulation unit converts the first decoding result and the second decoding result into analog signals and then sends the analog signals to the medium-wave amplitude modulation transmitter port and the frequency modulation transmitter port respectively, and the third decoding result is directly sent to the DTMB exciter port.
Specifically, after LDPC encoding is performed on a first emergency broadcast instruction, the first emergency broadcast instruction is modulated into an analog first emergency broadcast instruction by using an intermediate wave modulation unit and is sent to an intermediate wave amplitude modulation transmitter port, and meanwhile, after Manchester encoding is performed on a second emergency broadcast instruction, the second emergency broadcast instruction is modulated into an analog second emergency broadcast instruction by using a BPSK (binary phase shift keying) through a frequency modulation unit and is sent to a frequency modulation transmission port. The emergency broadcasting instructions with the adaptive format are respectively obtained from the medium wave amplitude modulation transmitter port and the frequency modulation transmitter port through the processing, and the emergency broadcasting instructions comprise instruction information such as broadcasting areas, broadcasting time and the like.
In the implementation of medium-wave and frequency modulation emergency broadcasting, the medium-wave amplitude modulation transmitter port and the frequency modulation transmitter port not only need the emergency broadcasting instruction with the adapted format, but also need specific broadcasting content, namely analog audio data, so that effective emergency broadcasting can be implemented. Therefore, the SOC module in this embodiment converts the digital audio data into analog audio data, and then uses the built-in audio switching unit to switch to the medium-wave amplitude modulation audio output channel or the frequency modulation audio output channel, for example, when it is determined that the medium-wave amplitude modulation broadcasting is currently being performed, and the audio switching unit is currently using the common audio channel to perform entertainment audio broadcasting, when receiving the analog audio data, it switches to the medium-wave amplitude modulation audio output channel and sends the analog audio data to the medium-wave amplitude modulation transmitter port. After the transmission of the analog first emergency broadcasting instruction and the analog audio data is completed, the medium-wave amplitude modulation transmitter port feeds back a playing completion instruction to the audio switching unit, and at the moment, the audio switching unit switches to a common audio output channel again after receiving the playing completion instruction. Therefore, the adapter in this embodiment also supports playing local audio sources, such as a usb disk or a microphone for shouting, so as to generate an emergency broadcast control signal, and outputs the emergency broadcast control signal and analog audio data together to the opening of the medium-wave amplitude modulation transmitter end for broadcast coverage. In addition, when it is determined that frequency modulation broadcasting is currently being performed, and the audio switching unit is currently performing entertainment audio broadcasting using a general audio channel, analog audio data is synchronously switched to the frequency modulation audio output channel and transmitted to the frequency modulation transmitter port after being received. After the frequency modulation transmitting port transmits the simulated second emergency broadcasting instruction and the simulated audio data, the frequency modulation transmitting port feeds back a playing completion instruction to the audio switching unit, and at the moment, the audio switching unit switches to the common audio output channel again after receiving the playing completion instruction. In addition, the adapter also supports the playing of local audio in the fm broadcast scene, and in this embodiment, no description will be given.
It should be noted that, since the adapter of the present embodiment does not support digital-to-analog conversion in the DTMB broadcasting scenario, the SOC module will directly send the third emergency broadcasting instruction and the digital audio data to the DTMB exciter port. And the DTMB exciter port is used for transmitting the audio data in a digital form and the third emergency broadcasting instruction to third equipment for digital-to-analog conversion, receiving a data conversion result of the third party equipment, and transmitting the converted analog audio data and the analog third emergency broadcasting instruction to terminal equipment in a coverage range through a DTMB transmitting station. The wave transmitter port in this embodiment is configured to send the analog audio data and the analog first emergency broadcast instruction to the terminal device in the coverage area through the medium wave transmitting station; and the frequency modulation transmitter port is used for transmitting the analog audio data and the analog second emergency broadcast instruction to terminal equipment in the coverage range through the frequency modulation transmitting station.
When the adapter broadcasts by adopting medium-wave amplitude modulation, frequency modulation or DTMB, the adapter specifically transmits the medium-wave amplitude modulation signal to the terminal device in the coverage area through the corresponding transmitting station in each broadcasting mode, for example, the medium-wave amplitude modulation signal transmitter port is used for transmitting the analog audio data and the analog first emergency broadcasting instruction to the terminal device in the coverage area through the medium-wave transmitting station.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. An emergency broadcast adapter for transmitting data based on a direct broadcast satellite channel, comprising: the system-on-chip SOC module is connected with the decoding unit and the audio switching unit respectively;
the decoding unit is used for decoding the received direct broadcast satellite signals to obtain digital decoding results and sending the decoding results to the SOC module, wherein the decoding results comprise emergency broadcast instructions and audio data;
the SOC module is used for respectively converting the decoding result into a first decoding result matched with a medium wave format, a second decoding result matched with a frequency modulation format and a third decoding result matched with a terrestrial digital multimedia broadcasting (DTMB) format;
the SOC module is also used for controlling the audio switching unit to switch entertainment audio and emergency broadcasting audio, converting the first decoding result and the second decoding result into analog signals through the modulation unit, then respectively transmitting the analog signals to a medium-wave amplitude modulation transmitter port and a frequency modulation transmitter port, and directly transmitting the third decoding result to a DTMB exciter port.
2. The adapter of claim 1, wherein the decoding unit is configured to receive and decode the live broadcast signal sent by an emergency broadcast platform via a live broadcast satellite based on a specified satellite channel to obtain the emergency broadcast instruction and the audio data, wherein the emergency broadcast instruction includes:
region trigger descriptor: for indicating on/off-air instructions and emergency broadcast areas;
EMM emergency broadcast instructions: an emergency broadcast message for indicating emergency broadcast channel information, effective time, version number;
satellite channel information: the direct broadcast satellite channel is used for indicating an emergency broadcasting state and a signal locking state of the satellite channel, and when the emergency broadcasting state is not in the emergency broadcasting state and the signal locking state is the locking state, the direct broadcast satellite channel can be used as an emergency broadcasting channel to transmit emergency broadcasting information.
3. The adapter according to claim 1 or 2, wherein the triggering means of the decoding unit comprises:
the area code triggering mode adopts area codes to address decoding units, so that emergency broadcasting is triggered to the decoding units of the adapters in the designated area; and/or the number of the groups of groups,
the intelligent card number triggering mode adopts the intelligent card number to address the decoding unit, so as to trigger emergency broadcasting to the decoding unit of the appointed adapter.
4. The adapter of claim 1, wherein the SOC module is configured to, when determining that the emergency broadcast instruction indicates an on-air instruction, convert the emergency broadcast instruction in the decoding result to a first emergency broadcast instruction matching a medium wave format, a second emergency broadcast instruction matching a frequency modulation format, and a third emergency broadcast instruction matching a DTMB format, respectively.
5. The adapter of claim 4 wherein said SOC module is further configured to convert audio data in digital form in said decoding result to analog audio data and to transmit said analog audio data to said medium wave amplitude modulation transmitter port and said frequency modulation transmitter port, respectively, via said audio switching unit.
6. The adapter of claim 5 wherein the SOC module is further configured to send the third emergency broadcast instruction and the audio data in digital form directly to the DTMB exciter port.
7. The adapter according to claim 6, wherein the adapter further comprises a medium wave modulation unit and a frequency modulation unit,
the medium wave modulation unit is used for modulating the first emergency broadcast instruction to obtain a simulated first emergency broadcast instruction, and transmitting the simulated first emergency broadcast instruction to the medium wave amplitude modulation transmitter port;
the frequency modulation unit is used for modulating the second emergency broadcast to obtain an analog second emergency broadcast instruction, and sending the analog second emergency broadcast instruction to the frequency modulation transmitter port.
8. The adapter of claim 5, wherein the medium wave transmitter port is configured to transmit the analog audio data and the analog first emergency broadcast instruction to a terminal device within a coverage area via a medium wave transmitting station;
and the frequency modulation transmitter port is used for transmitting the analog audio data and the analog second emergency broadcast instruction to terminal equipment in a coverage range through a frequency modulation transmitting station.
9. The adapter according to claim 2, further comprising a signal detection unit therein, wherein the signal detection unit is connected to the decoding unit;
the signal detection unit is used for monitoring signals of the designated satellite channel, checking the direct broadcast satellite signal when the direct broadcast satellite signal is determined to exist, and transmitting the direct broadcast satellite signal to the decoding unit when the direct broadcast satellite signal is determined to pass the checking.
10. An emergency broadcasting method based on direct broadcast satellite channel transmission data, applied to the emergency broadcasting adapter based on direct broadcast satellite channel transmission data as claimed in any one of claims 1 to 9, comprising:
decoding the received direct broadcast satellite signals through a decoding unit to obtain digital decoding results, and sending the decoding results to the SOC module, wherein the decoding results comprise emergency broadcast instructions and audio data;
converting the decoding result into a first decoding result matched with a medium wave format, a second decoding result matched with a frequency modulation format and a third decoding result matched with a terrestrial digital multimedia broadcasting (DTMB) format through an SOC module;
and the SOC module is used for controlling the audio switching unit to switch entertainment audio and emergency broadcasting audio, converting the first decoding result and the second decoding result into analog signals, respectively transmitting the analog signals to a medium-wave amplitude modulation transmitter port and a frequency modulation transmitter port, and directly transmitting the third decoding result to a DTMB exciter port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311672298.6A CN117676532A (en) | 2023-12-07 | 2023-12-07 | Emergency broadcast adapter and method based on direct broadcast satellite channel transmission data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311672298.6A CN117676532A (en) | 2023-12-07 | 2023-12-07 | Emergency broadcast adapter and method based on direct broadcast satellite channel transmission data |
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| Publication Number | Publication Date |
|---|---|
| CN117676532A true CN117676532A (en) | 2024-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311672298.6A Pending CN117676532A (en) | 2023-12-07 | 2023-12-07 | Emergency broadcast adapter and method based on direct broadcast satellite channel transmission data |
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| Country | Link |
|---|---|
| CN (1) | CN117676532A (en) |
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2023
- 2023-12-07 CN CN202311672298.6A patent/CN117676532A/en active Pending
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