CN112887841A - Method for responding to emergency broadcast by digital frequency modulation, DTMB set top box and system - Google Patents
Method for responding to emergency broadcast by digital frequency modulation, DTMB set top box and system Download PDFInfo
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- 238000005520 cutting process Methods 0.000 claims description 6
- 230000002618 waking effect Effects 0.000 claims description 6
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/488—Data services, e.g. news ticker
- H04N21/4882—Data services, e.g. news ticker for displaying messages, e.g. warnings, reminders
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
- H04H20/59—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for emergency or urgency
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- H—ELECTRICITY
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- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
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- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/435—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
- H04N21/4353—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream involving decryption of additional data
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- H—ELECTRICITY
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- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
- H04N21/440236—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display by media transcoding, e.g. video is transformed into a slideshow of still pictures, audio is converted into text
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Abstract
The invention discloses a method for responding to emergency broadcast by digital frequency modulation, a DTMB set top box and a system, wherein the method comprises the following steps: the FM-CDR receiving module and the FM-CDR decryption and analysis module acquire emergency information from the FM-CDR broadcast signals, wherein the emergency information comprises emergency instructions and emergency information, and the emergency information is emergency broadcast content; the DTMB receiving module obtains a DTMB program from the DTMB broadcast television signal; the main control module receives the emergency message, executes the emergency instruction and awakens the DTMB set-top box in advance for a necessary time period; the main control module converts the media type of the emergency broadcast content and synthesizes the emergency broadcast content to output the emergency broadcast content. The invention realizes real-time detection and receiving of emergency messages in FM-CDR broadcast signals and awakening of the DTMB set-top box for emergency broadcasting.
Description
Technical Field
The invention belongs to the technical field of emergency broadcasting, and particularly relates to a method for responding to emergency broadcasting by digital frequency modulation, a DTMB set top box and a system.
Background
The ground digital television DTMB set-top box receives, demodulates, demultiplexes and decodes DTMB broadcast television signals to obtain broadcast television program data, and outputs the broadcast television program data to a television for playing. When natural disasters or social public events occur, the emergency broadcast management platform sends emergency messages to the DTMB set top box. The problem of how to respond to emergency messages and play emergency broadcasts exists when the DTMB set-top box is turned off, standby or plays programs.
The existing emergency broadcasting system inserts the emergency message into the DTMB broadcast television signal, and the DTMB set-top box receives and separates the emergency message, and has the defects that a DTMB receiving module and a main control module 7 x 24 of the DTMB set-top box are required to run in real time, and high-frequency components are required for receiving, demodulating and decoding the DTMB signal, and the data volume for processing the DTMB broadcast television signal is large, so that the power consumption required by the DTMB set-top box for detecting the emergency message in real time is large, and the data processing is complex.
The frequency modulation frequency band digital audio broadcasting (FM-CDR) is a new generation digital broadcasting technology independently developed by China, and two industrial standards of frequency modulation frequency band digital audio broadcasting (FM-CDR) channels and multiplexing with independent intellectual property rights are provided in China in 2013. The FM-CDR adopts high-efficiency audio coding technology, achieves high sound quality under the bandwidth of analog FM broadcast, and can simultaneously transmit texts, images and data. The method has the advantages of good anti-interference performance, high frequency spectrum utilization rate and small transmitting power.
Therefore, based on the existing problems, the invention considers that the FM-CDR broadcast signal receives, demodulates, decodes, decrypts and analyzes the medium and low frequency components, has low power consumption, small data volume for processing the FM-CDR broadcast signal and low processing complexity, combines the FM-CDR and the DTMB set-top box, and provides a new technical method for solving the problem of how to respond to the emergency message and play the emergency broadcast when the DTMB set-top box is turned off, stands by or plays programs.
Disclosure of Invention
The invention aims to provide a method for responding to emergency broadcast by digital frequency modulation, a DTMB set top box and a system, and aims to solve the problem of how to respond to emergency messages and play the emergency broadcast by the DTMB set top box.
In order to achieve the purpose, the invention provides the following technical scheme:
a method, a DTMB set-top box and a system for responding to an emergency broadcast by digital FM, wherein,
in one aspect of the present invention, there is provided a method for responding to an emergency broadcast by a digital fm, comprising the steps of:
(1) when the DTMB set top box is turned off or is in standby or plays programs, the FM-CDR receiving module receives FM-CDR broadcast signals, FM-CDR data are obtained through demodulation and decoding, and then the FM-CDR decryption analysis module decrypts and analyzes the FM-CDR data to obtain emergency messages;
the emergency message comprises an emergency instruction and emergency information;
the emergency information is emergency broadcast content;
(2) when the DTMB set-top box plays a program, the DTMB receiving module receives DTMB broadcast television signals, and video and audio data of the DTMB program are obtained after demodulation, demultiplexing and decoding;
(3) the main control module receives the emergency message, executes the emergency instruction and awakens the DTMB set-top box in advance for a necessary time period;
the necessary time period refers to the time required by the DTMB set top box from awakening to outputting emergency broadcast playing content;
(4) the main control module firstly converts the media types of the emergency broadcast contents and then carries out synthesis processing on the emergency broadcast contents to obtain the emergency broadcast playing contents;
(5) the main control module controls the output module to output the emergency broadcast playing content to the playing equipment;
the playing device is one of a text playing device, a picture playing device, an audio playing device, a video and audio playing device and a streaming media playing device.
Further, the emergency instruction comprises a target area code, a playing date and time, a synthesizing mode and a playing media type;
the synthesis mode is one of cutting and broadcasting, picture-in-picture and superimposed captions;
the playing media type is one of text, pictures, audio, video, audio and video and streaming media;
the emergency information consists of a text file, a picture file, an audio file, a video-audio file or a streaming media file.
Further, in the step (1),
the DTMB set top box is powered off, namely the main control module operates at a reduced frequency, the DTMB receiving module and the output module are powered off, and the user response module is powered off;
the DTMB set top box is in standby mode, the main control module operates in a frequency reducing mode, the DTMB receiving module and the output module are powered off, and the user response module operates;
the DTMB set-top box plays programs, wherein the main control module runs at full frequency, the main control module is provided with receiving parameters of the DTMB receiving module, the DTMB receiving module receives DTMB broadcast television signals, and after demodulation, demultiplexing and decoding, video and audio data of the currently played DTMB programs are output by the output module controlled by the main control module;
in step (3), the method for waking up the set top box is as follows:
(a1) if the set-top box is shut down, the main control module switches from the low-frequency operation to the full-frequency operation, and the main control module enables the output module to be powered on and initialized;
(a2) if the set-top box is in standby state, the main control module switches from low-frequency operation to full-frequency operation, and the main control module enables the output module to be powered on and initialized;
(a3) if the set-top box plays the program, the main control module does not have the awakening operation.
Further, the DTMB set-top box has a unique code, in the step (3), before the DTMB set-top box is awakened, the main control module checks the emergency instruction and the emergency information, and the specific method comprises the following steps:
(c1) checking whether the format of the emergency command conforms to a preset format, and if not, returning to the step 1;
(c2) checking whether the target area code of the emergency command is matched with the code of the DTMB set-top box or not, and if not, returning to the step 1;
(c3) checking whether the playing date and time of the emergency instruction is less than the current date and time, if not, returning to the step 1;
(c4) checking whether the format of the emergency information accords with a preset format, and if not, returning to the step 1;
(c5) checking whether the content of the emergency information is legal or not, and if not, returning to the step 1;
the method for checking whether the content of the emergency information is legal is as follows:
(d1) if the emergency information is a text, cutting words, sequentially searching a prestored illegal word library, and if the emergency information is matched, judging that the emergency information is illegal;
(d2) if the emergency information is a picture, firstly, extracting a text from the picture, searching a prestored illegal word library, and if the emergency information is a matched word library, judging the word library to be illegal, and secondly, searching the picture in the prestored illegal picture library, and if the emergency information is a matched word library, judging the word library to be illegal;
(d3) if the emergency information is audio, converting the audio into characters, searching a pre-stored illegal character word library, and if the emergency information is matched, judging that the emergency information is illegal;
(d4) if the emergency information is a video, firstly, framing the video, secondly, extracting characters from the video frame, searching a pre-stored illegal word library, and if the emergency information is a video, judging that the emergency information is illegal, and thirdly, searching the video frame for the pre-stored illegal picture library, and if the emergency information is a video, judging that the emergency information is illegal;
(d5) if the emergency information is video and audio, firstly, checking audio, extracting audio from the video and audio, converting the audio into text, retrieving a prestored illegal word library if the emergency information is matched with the audio, secondly, checking video, extracting video from the video and audio, framing the video, extracting characters from video frames, retrieving the prestored illegal word library if the emergency information is matched with the audio, and then retrieving the video frames from the prestored illegal picture library if the emergency information is matched with the audio;
(d6) if the emergency information is a streaming media, firstly, checking the audio stream, extracting the audio stream from the streaming media, then, converting the audio stream into a text, retrieving a pre-stored illegal word stock, if the emergency information is a streaming media, then, checking the video stream, extracting the video stream from the streaming media, framing the video, then, extracting characters from the video frame, retrieving the pre-stored illegal word stock, if the emergency information is a streaming media, then, retrieving the video frame from the pre-stored illegal picture stock, if the emergency information is a streaming media, then, illegally obtaining the video frame from the video frame.
Further, in the step (4), the media type of the emergency broadcast content is converted into one of text, picture, audio, video, audio-video and streaming media;
in step (4), the method for synthesizing the emergency broadcast content includes:
(b1) if the emergency command is cut-and-broadcast, then: the method comprises the steps of firstly, stopping outputting the currently played DTMB program if the DTMB program is currently played, and secondly, directly replacing emergency broadcast contents;
(b2) if the synthesis mode of the emergency instruction is picture-in-picture, overlapping the emergency broadcast content to the picture-in-picture area of the video picture of the currently played DTMB program, and synthesizing a new program video;
(b3) and if the synthesis mode of the emergency command is the caption superposition, superposing the emergency broadcast content to the caption area of the video picture of the currently played DTMB program to synthesize a new program video.
On the other hand, the invention provides a digital Frequency Modulation (FM) response emergency broadcast digital multimedia broadcasting (DTMB) set-top box, which comprises an FM-CDR receiving module, an FM-CDR decryption and analysis module, a main control module, a DTMB receiving module and an output module;
the FM-CDR receiving module is connected with the FM-CDR decryption analysis module, receives the FM-CDR broadcast signals, demodulates and decodes the FM-CDR broadcast signals to obtain FM-CDR data, and transmits the FM-CDR data to the FM-CDR decryption analysis module;
the FM-CDR decryption and analysis module is connected with the main control module, decrypts and analyzes the FM-CDR data to obtain an emergency message, and transmits the emergency message to the main control module;
the emergency message comprises an emergency instruction and emergency information;
the emergency information is emergency broadcast content;
and the DTMB receiving module receives DTMB broadcast television signals according to receiving parameters set by the main control module, and obtains DTMB programs after demodulation, demultiplexing and decoding.
The main control module is connected with the DTMB receiving module and the output module, receives emergency messages, executes emergency instructions and awakens the DTMB set-top box in advance for a necessary time period;
the necessary time period refers to the time required by the DTMB set top box from awakening to outputting emergency broadcast playing content;
the main control module firstly converts the media types of the emergency broadcast contents, then carries out synthesis processing on the emergency broadcast contents to obtain emergency broadcast contents, and finally outputs the emergency broadcast contents to the playing equipment;
the playing device plays the emergency broadcast playing content in a playing media type of text, pictures, audio, video and streaming media.
And the DTMB set-top box further comprises a user response module which is connected with the main control module and responds to user operation, wherein under the condition that the DTMB set-top box is standby or plays programs, the response user operation is shielded before the emergency broadcast is played, and the response user operation is recovered after the emergency broadcast is played.
The emergency broadcast system further comprises a peripheral startup and shutdown module which is connected with the main control module to detect the startup and shutdown state of the playing device and control the startup and shutdown of the playing device, and the playing device is started before the emergency broadcast is played.
The emergency broadcasting system further comprises a storage module connected with the main control module, and the storage content of the storage module comprises emergency instructions, emergency information, emergency broadcasting content and emergency broadcasting playing content.
In still another aspect of the present invention, a system for responding to an emergency broadcast by a digital frequency modulation is further provided, comprising an emergency broadcast management platform, an FM-CDR transmission network, a DTMB transmission network and a DTMB set-top box;
the emergency broadcast management platform generates an emergency message;
the FM-CDR transmission network receives the emergency message from the emergency broadcast management platform and then transmits the emergency message to the DTMB set-top box;
the DTMB transmission network receives and transmits the DTMB programs to the DTMB set-top box;
the emergency message comprises an emergency instruction and emergency information;
the emergency information is emergency broadcast content.
Compared with the prior art, the invention has the following beneficial effects:
1) the FM-CDR receiving module, the FM-CDR decryption analysis module and the first control module receive FM-CDR broadcast signals in real time, detect and receive emergency messages in FM-CDR data, wake up the DTMB set-top box in time and transmit emergency instructions and the emergency messages to the main control module; the main control module obtains the emergency broadcast content, and converts, synthesizes and plays the emergency broadcast content according to the emergency instruction. The invention realizes real-time detection and receiving of the emergency message in the FM-CDR and further awakens the DTMB set-top box for emergency broadcasting.
2) The FM-CDR receiving module, the FM-CDR decryption analysis module and the first control module are used for detecting and receiving the emergency message in the FM-CDR in real time, the power consumption is low, the method is different from a general DTMB set top box which is used for receiving the DTMB broadcast television signal in real time and detecting and receiving the emergency message from the DTMB data, the method relates to a high-frequency processing component, the power consumption is high, and the data processing amount is large. The invention has the advantages of reducing data processing amount, reducing power consumption for detecting emergency messages and reducing standby power consumption.
3) Before executing the emergency instruction and awakening the DTMB set top box, the emergency message is checked, specifically, the format of the emergency instruction, the target area code, the playing date and time and the format and content of the emergency message are checked, and the invalid or illegal emergency message is not processed and the DTMB set top box is not awakened. The invention ensures the safe playing of the DTMB set top box and avoids misoperation.
4) The first control module receives the emergency message, executes the emergency instruction, and wakes up the DTMB set-top box in advance for a necessary time period, wherein the necessary time period refers to the time required by the DTMB set-top box from being woken up to outputting emergency broadcast playing content. The invention realizes time accurate awakening of the DTMB set top box, and the DTMB set top box is not awakened once an emergency message is received, thereby consuming a lot of power, or is not awakened before the emergency broadcast playing moment, thereby causing the playing delay.
5) When the DTMB set top box is turned off or is in standby or plays programs, the DTMB set top box end wakes up the DTMB set top box in a self-adaptive mode, related modules awakened in different states are different, only the module awakened for emergency broadcast playing is ensured to be awakened, and the unrelated modules are not awakened. The invention realizes the optimization of the emergency broadcast playing power consumption.
6) The media type of the emergency broadcast content can be different from the playing media type of the emergency broadcast playing content, the emergency broadcast playing content is obtained by converting the media type of the emergency broadcast content at the DTMB set-top box end in a self-adaptive mode and then synthesizing the emergency broadcast content, and the length of the emergency message can be shortened. The invention improves the distribution efficiency of the emergency message and also improves the efficiency of the set top box for receiving the emergency message.
7) Processing the received emergency message, converting the media types of the emergency broadcast contents, synthesizing the emergency broadcast contents to obtain emergency broadcast playing contents, and outputting the emergency broadcast playing contents to playing equipment, wherein the playing equipment is one of text playing equipment, picture playing equipment, audio playing equipment, video and audio playing equipment and streaming media playing equipment; different from the common DTMB set-top box, the digital television set-top box can only output to a television or a sound box. The invention expands the output mode of the DTMB set top box for emergency broadcasting by converting the emergency broadcasting content into the media types, synthesizing the emergency broadcasting content and outputting the emergency broadcasting content finally, and supports text playing equipment, picture playing equipment, audio playing equipment, video and audio playing equipment and streaming media playing equipment.
8) And the user response module responds to the user operation, shields the response user operation before the emergency broadcast is played and restores the response user operation after the emergency broadcast is played under the condition that the DTMB set-top box is standby or plays programs. Different from the common DTMB set-top box, the emergency broadcast can be interrupted by the user operation during the emergency broadcast playing, so that the emergency broadcast cannot be played completely; the method is also different from the method that the state of the set top box is reported to the emergency broadcast management platform before and after the emergency broadcast is played by some DTMB set top boxes, and then the emergency broadcast management platform remotely controls whether to respond to the user operation or not. The invention realizes that the set-top box autonomously processes and responds to the user operation, has high efficiency and ensures the complete playing of the emergency broadcast.
9) And the peripheral on-off module is connected with the main control module to detect the on-off state of the playing equipment and control the on-off of the playing equipment, and the playing equipment is started before the emergency broadcast is played. The invention realizes that the DTMB set top box and the external playing equipment jointly send the emergency broadcast to the user, thereby ensuring the playing of the emergency broadcast.
10) The digital frequency modulation emergency broadcast digital television set top box comprises an FM-CDR receiving module, an FM-CDR decryption analysis module, a main control module, a DTMB receiving module, an output module, a user response module, an external on-off module and a storage module.
11) The invention relates to a system consisting of an emergency broadcast management platform, an FM-CDR transmission network, a DTMB transmission network and a DTMB set-top box, and realizes a system which enables the DTMB set-top box to respond to emergency messages from FM-CDR signals and play emergency broadcasts; the invention receives emergency information from FM-CDR signals, the distribution path of emergency broadcast is that an emergency broadcast management platform transmits to an FM-CDR transmission network, the FM-CDR transmission network transmits to a DTMB set-top box with FM-CDR receiving processing, while a general emergency broadcast system using the DTMB set-top box as a terminal receives the emergency information from DTMB broadcast television signals, the distribution path of emergency broadcast is that the emergency broadcast management platform transmits to the DTMB transmission network, and the DTMB transmission network transmits to the DTMB set-top box; the invention improves the distribution efficiency of the emergency message and reduces the operation and maintenance power consumption of the system by utilizing the advantages of large FM-CDR broadcast coverage range, long signal wavelength, convenient receiving and low detection power consumption.
Drawings
FIG. 1 is a flow chart illustrating a method for responding to an emergency broadcast by digital FM according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a DTMB set-top box responding to emergency broadcasting by digital fm in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a system for responding to emergency broadcasting by digital fm according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention are further described in detail below with reference to the accompanying drawings and the embodiments.
Embodiments a method, DTMB set-top box and system for responding to emergency broadcasts by digital fm, as shown in fig. 1-3, wherein,
in one aspect of this embodiment, a method for responding to an emergency broadcast by a digital fm includes the following steps:
(1) when the DTMB set top box 400 is turned off or is in standby or plays programs, the FM-CDR receiving module 1 receives FM-CDR broadcast signals, FM-CDR data are obtained through demodulation and decoding, and then the FM-CDR decryption analysis module 2 decrypts and analyzes the FM-CDR data to obtain emergency messages;
the emergency message comprises an emergency instruction and emergency information;
emergency information, which is emergency broadcast content;
(2) when the DTMB set-top box 400 plays a program, the DTMB receiving module 4 receives a DTMB broadcast television signal, and obtains video and audio data of the DTMB program after demodulation, demultiplexing and decoding;
(3) the main control module 3 receives the emergency message, executes the emergency instruction, and awakens the DTMB set-top box 400 in advance for a necessary time period;
a necessary time period, which is the time required for the DTMB set-top box 400 to output the emergency broadcast contents from being awakened;
(4) the main control module 3 firstly converts the media types of the emergency broadcast contents, and then carries out synthesis processing on the emergency broadcast contents to obtain emergency broadcast playing contents;
(5) the main control module 3 controls the output module 5 to output the emergency broadcast playing content to the playing device;
the playing device is one of a text playing device, a picture playing device, an audio playing device, a video and audio playing device and a streaming media playing device.
Further, the emergency instruction comprises a target area code, a playing date and time, a synthesizing mode and a playing media type;
the synthesis mode is one of cutting and broadcasting, picture-in-picture and superimposed caption;
the playing media type is one of text, pictures, audio, video, audio and video and streaming media;
the emergency information consists of a text file or a picture file or an audio file or a video-audio file or a streaming media file.
Further, in the step (1),
the DTMB set top box 400 is powered off, namely the main control module 3 operates at a low frequency, the DTMB receiving module 4 and the output module 5 are powered off, and the user response module 6 is powered off;
when the DTMB set-top box 400 is in standby, the main control module 3 operates at a low frequency, the DTMB receiving module 4 and the output module 5 are powered off, and the user response module 6 operates;
the DTMB set-top box 400 plays programs, namely, a main control module 3 runs at full frequency, the main control module 3 sets receiving parameters of a DTMB receiving module 4, the DTMB receiving module 4 receives DTMB broadcast television signals, and after demodulation, demultiplexing and decoding, video and audio data of the currently played DTMB programs are output by an output module 5 controlled by the main control module 3;
in step (3), the method for waking up the set top box is as follows:
(a1) if the set-top box is shut down, the main control module 3 is switched from the low-frequency operation to the full-frequency operation, and the main control module 3 enables the output module 5 to be powered on and initialized;
(a2) if the set-top box is in standby state, the main control module 3 is switched from low-frequency operation to full-frequency operation, and the main control module 3 enables the output module 5 to be powered on and initialized;
(a3) if the set-top box plays the program, the main control module 3 has no wake-up operation.
Further, the DTMB set-top box 400 has a unique code, and in step (3), before waking up the DTMB set-top box 400, the main control module 3 checks the emergency instruction and the emergency information, and the specific method is as follows:
(c1) checking whether the format of the emergency command conforms to a preset format, and if not, returning to the step 1;
(c2) checking whether the target area code of the emergency command is matched with the code of the DTMB set top box 400, if not, returning to the step 1;
(c3) checking whether the playing date and time of the emergency instruction is less than the current date and time, if not, returning to the step 1;
(c4) checking whether the format of the emergency information accords with a preset format, and if not, returning to the step 1;
(c5) checking whether the content of the emergency information is legal or not, and if not, returning to the step 1;
the method for checking whether the content of the emergency information is legal is as follows:
(d1) if the emergency information is a text, cutting words, sequentially searching a prestored illegal word library, and if the emergency information is matched, judging that the emergency information is illegal;
(d2) if the emergency information is a picture, firstly, extracting a text from the picture, searching a prestored illegal word library, and if the emergency information is a matched word library, judging the word library to be illegal, and secondly, searching the picture in the prestored illegal picture library, and if the emergency information is a matched word library, judging the word library to be illegal;
(d3) if the emergency information is audio, converting the audio into characters, searching a pre-stored illegal character word library, and if the emergency information is matched, judging that the emergency information is illegal;
(d4) if the emergency information is a video, firstly, framing the video, secondly, extracting characters from the video frame, searching a pre-stored illegal word library, and if the emergency information is a video, judging that the emergency information is illegal, and thirdly, searching the video frame for the pre-stored illegal picture library, and if the emergency information is a video, judging that the emergency information is illegal;
(d5) if the emergency information is video and audio, firstly, checking audio, extracting audio from the video and audio, converting the audio into text, retrieving a prestored illegal word library if the emergency information is matched with the audio, secondly, checking video, extracting video from the video and audio, framing the video, extracting characters from video frames, retrieving the prestored illegal word library if the emergency information is matched with the audio, and then retrieving the video frames from the prestored illegal picture library if the emergency information is matched with the audio;
(d6) if the emergency information is a streaming media, firstly, checking the audio stream, extracting the audio stream from the streaming media, then, converting the audio stream into a text, retrieving a pre-stored illegal word stock, if the emergency information is a streaming media, then, checking the video stream, extracting the video stream from the streaming media, framing the video, then, extracting characters from the video frame, retrieving the pre-stored illegal word stock, if the emergency information is a streaming media, then, retrieving the video frame from the pre-stored illegal picture stock, if the emergency information is a streaming media, then, illegally obtaining the video frame from the video frame.
Further, in the step (4), converting the media type of the emergency broadcast content into one of text, picture, audio, video, audio and streaming media;
in step (4), the method of synthesizing the emergency broadcast content includes:
(b1) if the emergency command is cut-and-broadcast, then: the method comprises the steps of firstly, stopping outputting the currently played DTMB program if the DTMB program is currently played, and secondly, directly replacing emergency broadcast contents;
(b2) if the synthesis mode of the emergency instruction is picture-in-picture, overlapping the emergency broadcast content to the picture-in-picture area of the video picture of the currently played DTMB program, and synthesizing a new program video;
(b3) and if the synthesis mode of the emergency command is the caption superposition, superposing the emergency broadcast content to the caption area of the video picture of the currently played DTMB program to synthesize a new program video.
In another aspect of this embodiment, a digital FM response emergency broadcast DTMB set-top box is provided, which includes an FM-CDR receiving module 1, an FM-CDR decryption and analysis module 2, a main control module 3, a DTMB receiving module 4, and an output module 5;
the FM-CDR receiving module 1 is connected with the FM-CDR decryption analysis module 2, receives the FM-CDR broadcast signals, demodulates and decodes the FM-CDR broadcast signals to obtain FM-CDR data, and transmits the FM-CDR data to the FM-CDR decryption analysis module 2;
the FM-CDR decryption and analysis module 2 is connected with the main control module 3, decrypts and analyzes the FM-CDR data to obtain an emergency message, and transmits the emergency message to the main control module 3;
the emergency message comprises an emergency instruction and emergency information;
emergency information, which is emergency broadcast content;
the DTMB receiving module 4 receives DTMB broadcast television signals according to receiving parameters set by the main control module 3, and obtains DTMB programs after demodulation, demultiplexing and decoding;
the main control module 3 is connected with the DTMB receiving module 4 and the output module 5, receives emergency messages, executes emergency instructions and wakes up the DTMB set-top box 400 in advance for a necessary time period;
a necessary time period, which is the time required for the DTMB set-top box 400 to output the emergency broadcast contents from being awakened;
the main control module 3 firstly converts the media types of the emergency broadcast contents, then carries out synthesis processing on the emergency broadcast contents to obtain emergency broadcast contents, and finally outputs the emergency broadcast contents to the playing equipment;
the playing device is used for playing the emergency broadcast playing content in a playing media type of text, pictures, audio, video, audio-video or streaming media.
Further, the digital television set top box 400 further comprises a user response module 6 connected with the main control module 3 to respond to user operation, wherein under the condition that the digital television set top box 400 is standby or plays programs, the response user operation is shielded before the emergency broadcast is played, and the response user operation is recovered after the emergency broadcast is played.
Further, the emergency broadcast system also comprises a peripheral startup and shutdown module 7 which is connected with the main control module 3 to detect the startup and shutdown state of the playing device and control the startup and shutdown of the playing device, and the playing device is started before the emergency broadcast is played.
Further, the emergency broadcast system also comprises a storage module 8 connected with the main control module 3, and the storage content of the storage module 8 comprises emergency instructions, emergency information, emergency broadcast content and emergency broadcast playing content.
Further, the core model of the main control module 3 is haisi hi3798MV 200.
In another aspect of this embodiment, a system for responding to an emergency broadcast by a digital FM is further provided, which includes an emergency broadcast management platform 100, an FM-CDR transmission network 200, a DTMB transmission network 300, and a DTMB set-top box 400;
the emergency broadcast management platform 100 generates an emergency message;
the FM-CDR transmission network 200 receives the emergency message from the emergency broadcast management platform 100 and then transmits the emergency message to the DTMB set-top box 400;
a DTMB transmission network 300 for receiving and transmitting the DTMB program to the DTMB set-top box 400;
the emergency message comprises an emergency instruction and emergency information;
the emergency information is emergency broadcast content.
As can be seen from this embodiment, the present invention has the following advantages:
1) the FM-CDR receiving module 1, the FM-CDR decryption and analysis module 2 and the first control module receive FM-CDR broadcast signals in real time, detect and receive emergency messages in FM-CDR data, wake up the DTMB set-top box 400 in time and transmit emergency instructions and emergency messages to the main control module 3; the main control module 3 obtains the emergency broadcast content, and converts, synthesizes and plays the emergency broadcast content according to the emergency instruction. The invention realizes real-time detection and receiving of the emergency message in the FM-CDR and further awakens the DTMB set-top box for emergency broadcasting.
2) The FM-CDR receiving module 1, the FM-CDR decryption analysis module 2 and the first control module are used for detecting and receiving the emergency message in the FM-CDR in real time, and the method relates to a medium-low frequency processing component, is low in power consumption, is different from a common DTMB set top box which is used for receiving DTMB broadcast television signals in real time and detecting and receiving the emergency message from DTMB data, and relates to a high frequency processing component, is high in power consumption and large in data processing quantity. The invention has the advantages of reducing data processing amount, reducing power consumption for detecting emergency messages and reducing standby power consumption.
3) Before executing the emergency instruction and waking up the DTMB set-top box 400, the emergency message is checked, specifically, the format of the emergency instruction, the target area code, the playing date and time, and the format and content of the emergency message are checked, and the invalid or illegal emergency message is not processed and the DTMB set-top box 400 is not woken up. The invention ensures the safe playing of the DTMB set top box and avoids misoperation.
4) The first control module receives the emergency message, executes the emergency instruction, and wakes up the DTMB set-top box 400 in advance for a necessary time period, wherein the necessary time period refers to the time required by the DTMB set-top box 400 from being woken up to outputting the emergency broadcast playing content. The invention realizes time accurate awakening of the DTMB set top box, and the DTMB set top box is not awakened once an emergency message is received, thereby consuming a lot of power, or is not awakened before the emergency broadcast playing moment, thereby causing the playing delay.
5) When the DTMB set-top box 400 is turned off or is in standby or plays programs, the DTMB set-top box 400 is woken up the DTMB set-top box 400 in a self-adaptive manner, and related modules woken up in different states are different, so that only the module for playing emergency broadcast is woken up, and the unrelated modules are not woken up. The invention realizes the optimization of the emergency broadcast playing power consumption.
6) The media type of the emergency broadcast content can be different from the playing media type of the emergency broadcast playing content, and the emergency broadcast playing content is obtained by adaptively converting the media type of the emergency broadcast content at the DTMB set top box 400 and then synthesizing the emergency broadcast content, so that the length of the emergency message can be shortened. The invention improves the distribution efficiency of the emergency message and also improves the efficiency of the set top box for receiving the emergency message.
7) Processing the received emergency message, converting the media types of the emergency broadcast contents, synthesizing the emergency broadcast contents to obtain emergency broadcast playing contents, and outputting the emergency broadcast playing contents to playing equipment, wherein the playing equipment is one of text playing equipment, picture playing equipment, audio playing equipment, video and audio playing equipment and streaming media playing equipment; different from the common DTMB set-top box, the digital television set-top box can only output to a television or a sound box. The invention expands the output mode of the DTMB set top box for emergency broadcasting by converting the emergency broadcasting content into the media types, synthesizing the emergency broadcasting content and outputting the emergency broadcasting content finally, and supports text playing equipment, picture playing equipment, audio playing equipment, video and audio playing equipment and streaming media playing equipment.
8) The user response module 6, which responds to the user operation, masks the response user operation before the emergency broadcast is played and restores the response user operation after the emergency broadcast is played, under the condition that the DTMB set-top box 400 is standby or plays a program. Different from the common DTMB set-top box, the emergency broadcast can be interrupted by the user operation during the emergency broadcast playing, so that the emergency broadcast cannot be played completely; the method is also different from the method that the state of the set top box is reported to the emergency broadcast management platform before and after the emergency broadcast is played by some DTMB set top boxes, and then the emergency broadcast management platform remotely controls whether to respond to the user operation or not. The invention realizes that the set-top box autonomously processes and responds to the user operation, has high efficiency and ensures the complete playing of the emergency broadcast.
9) And the peripheral on-off module 7 is connected with the main control module 3 to detect the on-off state of the playing equipment and control the on-off of the playing equipment, and the playing equipment is started before the emergency broadcast is played. The invention realizes that the DTMB set top box and the external playing equipment jointly send the emergency broadcast to the user, thereby ensuring the playing of the emergency broadcast.
10) The digital frequency modulation emergency broadcast digital television set top box comprises an FM-CDR receiving module 1, an FM-CDR decryption analysis module 2, a main control module 3, a DTMB receiving module 4, an output module 5, a user response module 6, an external startup and shutdown module 7 and a storage module 8.
11) The invention relates to a system consisting of an emergency broadcast management platform 100, an FM-CDR transmission network 200, a DTMB transmission network 300 and a DTMB set-top box 400, and realizes a system which enables the DTMB set-top box 400 to respond to emergency messages from FM-CDR signals and play emergency broadcasts; the invention receives emergency information from FM-CDR signals, the distribution path of emergency broadcast is that an emergency broadcast management platform transmits to an FM-CDR transmission network, the FM-CDR transmission network transmits to a DTMB set-top box with FM-CDR receiving processing, while a general emergency broadcast system using the DTMB set-top box as a terminal receives the emergency information from DTMB broadcast television signals, the distribution path of emergency broadcast is that the emergency broadcast management platform transmits to the DTMB transmission network, and the DTMB transmission network transmits to the DTMB set-top box; the invention improves the distribution efficiency of the emergency message and reduces the operation and maintenance power consumption of the system by utilizing the advantages of large FM-CDR broadcast coverage range, long signal wavelength, convenient receiving and low detection power consumption.
The above embodiments further explain the object, technical solution and advantageous effects of the present invention in detail. The above description is only exemplary of the present invention and should not be taken as limiting the scope of the invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (10)
1. The method for responding to the emergency broadcast by the digital frequency modulation is characterized by comprising the following steps:
(1) when the DTMB set top box is turned off or is in standby or plays programs, the FM-CDR receiving module receives FM-CDR broadcast signals, FM-CDR data are obtained through demodulation and decoding, and then the FM-CDR decryption analysis module decrypts and analyzes the FM-CDR data to obtain emergency messages;
the emergency message comprises an emergency instruction and emergency information;
the emergency information is emergency broadcast content;
(2) when the DTMB set-top box plays a program, the DTMB receiving module receives DTMB broadcast television signals, and video and audio data of the DTMB program are obtained after demodulation, demultiplexing and decoding;
(3) the main control module receives the emergency message, executes the emergency instruction and awakens the DTMB set-top box in advance for a necessary time period;
the necessary time period refers to the time required by the DTMB set top box from awakening to outputting emergency broadcast playing content;
(4) the main control module firstly converts the media types of the emergency broadcast contents and then carries out synthesis processing on the emergency broadcast contents to obtain the emergency broadcast playing contents;
(5) the main control module controls the output module to output the emergency broadcast playing content to the playing equipment;
the playing device is one of a text playing device, a picture playing device, an audio playing device, a video and audio playing device and a streaming media playing device.
2. The method for emergency broadcasting with digital FM response according to claim 1,
the emergency instruction comprises a target area code, a playing date and time, a synthesizing mode and a playing media type;
the synthesis mode is one of cutting and broadcasting, picture-in-picture and superimposed captions;
the playing media type is one of text, pictures, audio, video, audio and video and streaming media;
the emergency information consists of a text file, a picture file, an audio file, a video-audio file or a streaming media file.
3. The method for emergency broadcasting with digital FM response according to claim 1, wherein in step (1),
the DTMB set top box is powered off, namely the main control module operates at a reduced frequency, the DTMB receiving module and the output module are powered off, and the user response module is powered off;
the DTMB set top box is in standby mode, the main control module operates in a frequency reducing mode, the DTMB receiving module and the output module are powered off, and the user response module operates;
the DTMB set-top box plays programs, wherein the main control module runs at full frequency, the main control module is provided with receiving parameters of the DTMB receiving module, the DTMB receiving module receives DTMB broadcast television signals, and after demodulation, demultiplexing and decoding, video and audio data of the currently played DTMB programs are output by the output module controlled by the main control module;
in step (3), the method for waking up the set top box is as follows:
(a1) if the set-top box is shut down, the main control module switches from the low-frequency operation to the full-frequency operation, and the main control module enables the output module to be powered on and initialized;
(a2) if the set-top box is in standby state, the main control module switches from low-frequency operation to full-frequency operation, and the main control module enables the output module to be powered on and initialized;
(a3) if the set-top box plays the program, the main control module does not have the awakening operation.
4. The method for responding to the emergency broadcast according to claim 1 or 2, wherein the DTMB set-top box has a unique code, and in the step (3), before waking up the DTMB set-top box, the main control module checks the emergency command and the emergency information, and the specific method is as follows:
(c1) checking whether the format of the emergency command conforms to a preset format, and if not, returning to the step 1;
(c2) checking whether the target area code of the emergency command is matched with the code of the DTMB set-top box or not, and if not, returning to the step 1;
(c3) checking whether the playing date and time of the emergency instruction is less than the current date and time, if not, returning to the step 1;
(c4) checking whether the format of the emergency information accords with a preset format, and if not, returning to the step 1;
(c5) checking whether the content of the emergency information is legal or not, and if not, returning to the step 1;
the method for checking whether the content of the emergency information is legal is as follows:
(d1) if the emergency information is a text, cutting words, sequentially searching a prestored illegal word library, and if the emergency information is matched, judging that the emergency information is illegal;
(d2) if the emergency information is a picture, firstly, extracting a text from the picture, searching a prestored illegal word library, and if the emergency information is a matched word library, judging the word library to be illegal, and secondly, searching the picture in the prestored illegal picture library, and if the emergency information is a matched word library, judging the word library to be illegal;
(d3) if the emergency information is audio, converting the audio into characters, searching a pre-stored illegal character word library, and if the emergency information is matched, judging that the emergency information is illegal;
(d4) if the emergency information is a video, firstly, framing the video, secondly, extracting characters from the video frame, searching a pre-stored illegal word library, and if the emergency information is a video, judging that the emergency information is illegal, and thirdly, searching the video frame for the pre-stored illegal picture library, and if the emergency information is a video, judging that the emergency information is illegal;
(d5) if the emergency information is video and audio, firstly, checking audio, extracting audio from the video and audio, converting the audio into text, retrieving a prestored illegal word library if the emergency information is matched with the audio, secondly, checking video, extracting video from the video and audio, framing the video, extracting characters from video frames, retrieving the prestored illegal word library if the emergency information is matched with the audio, and then retrieving the video frames from the prestored illegal picture library if the emergency information is matched with the audio;
(d6) if the emergency information is a streaming media, firstly, checking the audio stream, extracting the audio stream from the streaming media, then, converting the audio stream into a text, retrieving a pre-stored illegal word stock, if the emergency information is a streaming media, then, checking the video stream, extracting the video stream from the streaming media, framing the video, then, extracting characters from the video frame, retrieving the pre-stored illegal word stock, if the emergency information is a streaming media, then, retrieving the video frame from the pre-stored illegal picture stock, if the emergency information is a streaming media, then, illegally obtaining the video frame from the video frame.
5. A method for responding to an emergency broadcast by digital FM according to claim 1 or 2,
in the step (4), the media type of the emergency broadcast content is converted into one of text, picture, audio, video, audio and streaming media;
in step (4), the method for synthesizing the emergency broadcast content includes:
(b1) if the emergency command is cut-and-broadcast, then: the method comprises the steps of firstly, stopping outputting the currently played DTMB program if the DTMB program is currently played, and secondly, directly replacing emergency broadcast contents;
(b2) if the synthesis mode of the emergency instruction is picture-in-picture, overlapping the emergency broadcast content to the picture-in-picture area of the video picture of the currently played DTMB program, and synthesizing a new program video;
(b3) and if the synthesis mode of the emergency command is the caption superposition, superposing the emergency broadcast content to the caption area of the video picture of the currently played DTMB program to synthesize a new program video.
6. The digital FM response emergency broadcasting DTMB set-top box according to any one of claims 1-5, comprising an FM-CDR receiving module, an FM-CDR decryption parsing module, a main control module, a DTMB receiving module and an output module;
the FM-CDR receiving module is connected with the FM-CDR decryption analysis module, receives the FM-CDR broadcast signals, demodulates and decodes the FM-CDR broadcast signals to obtain FM-CDR data, and transmits the FM-CDR data to the FM-CDR decryption analysis module;
the FM-CDR decryption and analysis module is connected with the main control module, decrypts and analyzes the FM-CDR data to obtain an emergency message, and transmits the emergency message to the main control module;
the emergency message comprises an emergency instruction and emergency information;
the emergency information is emergency broadcast content;
the DTMB receiving module receives DTMB broadcast television signals according to receiving parameters set by the main control module, and the DTMB broadcast television signals are demodulated, demultiplexed and decoded to obtain DTMB programs;
the main control module is connected with the DTMB receiving module and the output module, receives emergency messages, executes emergency instructions and awakens the DTMB set-top box in advance for a necessary time period;
the necessary time period refers to the time required by the DTMB set top box from awakening to outputting emergency broadcast playing content;
the main control module firstly converts the media types of the emergency broadcast contents, then carries out synthesis processing on the emergency broadcast contents to obtain emergency broadcast contents, and finally outputs the emergency broadcast contents to the playing equipment;
the playing device plays the emergency broadcast playing content in a playing media type of text, pictures, audio, video and streaming media.
7. The DTMB set-top box for responding to emergency broadcasts by digital FM according to claim 6, further comprising a user response module connected to the main control module for responding to user actions, wherein under standby or program playing conditions of the DTMB set-top box, the response to user actions is masked before the emergency broadcast is played, and the response to user actions is resumed after the emergency broadcast is played.
8. The DTMB set-top box for responding to emergency broadcasts by digital FM according to claim 6, further comprising a peripheral power on/off module connected to the main control module for detecting the power on/off state of the playback device and controlling the power on/off of the playback device, wherein the playback device is powered on before the emergency broadcast is played.
9. The DTMB set-top box for responding to emergency broadcasts by digital FM according to claim 6, further comprising a storage module connected to the main control module, wherein the storage contents of the storage module comprise emergency instructions, emergency information, emergency broadcast contents and emergency broadcast playing contents.
10. The system for responding to the emergency broadcast by the digital frequency modulation is characterized by comprising an emergency broadcast management platform, an FM-CDR transmission network, a DTMB transmission network and a DTMB set-top box;
the emergency broadcast management platform generates an emergency message;
the FM-CDR transmission network receives the emergency message from the emergency broadcast management platform and then transmits the emergency message to the DTMB set-top box;
the DTMB transmission network receives and transmits the DTMB programs to the DTMB set-top box;
the DTMB set-top box comprising the DTMB set-top box for emergency broadcasting by digital fm response of any of claims 6 to 9;
the emergency message comprises an emergency instruction and emergency information;
the emergency information is emergency broadcast content.
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| CN202110251236.2A CN112887841A (en) | 2021-03-08 | 2021-03-08 | Method for responding to emergency broadcast by digital frequency modulation, DTMB set top box and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023186192A3 (en) * | 2023-07-12 | 2024-03-14 | 六安景顺长华科技有限公司 | Dtmb set-top box for emergency broadcast activated by fm-cdr |
| WO2023186191A3 (en) * | 2023-07-12 | 2024-03-14 | 六安景顺长华科技有限公司 | Dtmb set-top box for emergency broadcast in response to fm-cdr |
-
2021
- 2021-03-08 CN CN202110251236.2A patent/CN112887841A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023186192A3 (en) * | 2023-07-12 | 2024-03-14 | 六安景顺长华科技有限公司 | Dtmb set-top box for emergency broadcast activated by fm-cdr |
| WO2023186191A3 (en) * | 2023-07-12 | 2024-03-14 | 六安景顺长华科技有限公司 | Dtmb set-top box for emergency broadcast in response to fm-cdr |
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