CN112788412A - Method for awakening emergency broadcast by subcarrier, DTMB set top box and system - Google Patents

Method for awakening emergency broadcast by subcarrier, DTMB set top box and system Download PDF

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Publication number
CN112788412A
CN112788412A CN202110248137.9A CN202110248137A CN112788412A CN 112788412 A CN112788412 A CN 112788412A CN 202110248137 A CN202110248137 A CN 202110248137A CN 112788412 A CN112788412 A CN 112788412A
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China
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emergency
dtmb
broadcast
control module
top box
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CN202110248137.9A
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Chinese (zh)
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张瑞勋
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Lu'an Fuhua Intelligent Information Technology Co ltd
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Lu'an Fuhua Intelligent Information Technology Co ltd
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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
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/44—Arrangements characterised by circuits or components specially adapted for broadcast
    • H04H20/46—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95
    • 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
    • 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
    • H04N21/43—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
    • 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
    • H04N21/43—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
    • H04N21/4355—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream involving reformatting operations of additional data, e.g. HTML pages on a television screen
    • 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
    • H04N21/43—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
    • H04N21/439—Processing of audio elementary streams
    • H04N21/4398—Processing of audio elementary streams involving reformatting operations of audio signals
    • 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
    • H04N21/43—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
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
    • H04N21/440218—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display by transcoding between formats or standards, e.g. from MPEG-2 to MPEG-4
    • 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
    • H04N21/43—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
    • H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
    • H04N21/4432—Powering on the client, e.g. bootstrap loading using setup parameters being stored locally or received from the server
    • 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
    • H04N21/43—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
    • H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
    • H04N21/4436—Power management, e.g. shutting down unused components of the receiver
    • 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
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4622—Retrieving content or additional data from different sources, e.g. from a broadcast channel and the Internet
    • 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
    • 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]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/81—Monomedia components thereof
    • H04N21/8126—Monomedia components thereof involving additional data, e.g. news, sports, stocks, weather forecasts
    • H04N21/814—Monomedia components thereof involving additional data, e.g. news, sports, stocks, weather forecasts comprising emergency warnings

Abstract

The invention discloses a method for awakening emergency broadcast by subcarrier, a DTMB set-top box and a system, wherein the method comprises the following steps: the method comprises the steps that a frequency modulation subcarrier receiving module and a frequency modulation subcarrier decryption analysis module acquire emergency messages from frequency modulation subcarrier broadcast signals, the emergency messages comprise 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 first control module receives the emergency message, executes the emergency instruction, wakes up the DTMB set-top box in advance for a necessary time period, and transmits the emergency message to the main control module for receiving the program video and audio data; 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 frequency modulation subcarrier broadcast signals and awakening of the DTMB set top box for emergency broadcasting.

Description

Method for awakening emergency broadcast by subcarrier, DTMB set top box and system
Technical Field
The invention belongs to the technical field of emergency broadcasting, and particularly relates to a method for awakening emergency broadcasting by subcarrier, 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 bandwidth of FM broadcast stereo channel is about 200KHz, while the main carrier audio only occupies about half of the frequency, the rest part is unused, and the part is not called as subcarrier. The frequency modulation subcarrier technology is to transmit data signals by utilizing subcarriers, and one frequency modulation frequency can realize the simultaneous transmission of audio signals and coded signals. The FM subcarrier technology is classified into FM-SCA (chinese standard, national standard GB4311.3-84, subcarrier frequency 67 KHz), FM-RDS broadcast (european standard, subcarrier frequency 57KHz), FM-RBDS broadcast (american standard, subcarrier frequency 57KHz), and FM-DARC broadcast (japanese standard, subcarrier frequency 76 KHz).
Therefore, based on the existing problems, the invention provides a new technical method by considering that the data volume of the frequency modulation subcarrier is small, the processing complexity is low, and the power consumption is low, and combining the frequency modulation subcarrier with the DTMB set-top box, so as to solve 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 awakening emergency broadcast by subcarrier, 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 waking up an emergency broadcast by a subcarrier, wherein,
in one aspect of the present invention, a method for waking up an emergency broadcast by a subcarrier is provided, which includes the following steps:
(1) when the DTMB set top box is turned off or is in standby or plays programs, the frequency modulation subcarrier receiving module receives frequency modulation subcarrier broadcasting signals, frequency modulation subcarrier data are obtained through demodulation and decoding, and then the frequency modulation subcarrier decryption analysis module decrypts and analyzes the frequency modulation subcarrier data to obtain emergency messages;
the frequency modulation subcarrier broadcast is one of FM-SCA broadcast, FM-RDS broadcast, FM-RBDS broadcast and FM-DARC broadcast;
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 first control module receives an emergency message, executes an emergency instruction, wakes up the DTMB set-top box in advance for a necessary time period, and transmits the emergency instruction and the emergency information to the main control module, 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;
(4) the main control module executes an emergency instruction, firstly converts the media type of emergency broadcast content, and then carries out synthesis processing on the emergency broadcast content to obtain emergency broadcast playing content;
(5) the main control module controls the output module to output the emergency broadcast playing content to the playing device, wherein 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, in the step (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.
Further, in the step (1),
the DTMB set top box is powered off when the main control module, the DTMB receiving module and the output module are powered off;
the DTMB set top box is in standby state, the main control module is in sleep state, and the DTMB receiving module and the output module are powered off;
the DTMB set-top box plays a program, the main control module sets 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 program are output by the output module under the control of 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 powered off, the first control module powers on and initializes the main control module, and the first control module directly or through the main control module powers on and initializes the output module;
(a2) if the set-top box is in standby, the first control module sends a wake-up instruction to the main control module, the main control module restores the working state from the dormant state, and the first control module directly or through the main control module enables the output module to be powered on and initialized;
(a3) if the set-top box plays the program, the first control module does not have the awakening operation.
Further, the DTMB set-top box has a unique code, and in step (3), before executing the emergency instruction, the first control module checks the emergency message, 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.
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 DTMB set-top box for awakening emergency broadcast by subcarrier, which comprises a frequency modulation subcarrier receiving module, a frequency modulation subcarrier decryption analysis module, a first control module, a main control module, a DTMB receiving module and an output module;
the frequency modulation subcarrier receiving module is connected with the frequency modulation subcarrier decryption analysis module, receives the frequency modulation subcarrier broadcast signals, demodulates and decodes the frequency modulation subcarrier broadcast signals to obtain frequency modulation subcarrier data, and transmits the frequency modulation subcarrier data to the frequency modulation subcarrier decryption analysis module;
the frequency modulation subcarrier decryption and analysis module is connected with the first control module, decrypts and analyzes frequency modulation subcarrier data to obtain emergency information, and transmits the emergency information to the first control module;
the frequency modulation subcarrier broadcast is one of FM-SCA broadcast, FM-RDS broadcast, FM-RBDS broadcast and FM-DARC broadcast;
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 after demodulation, demultiplexing and decoding, the currently played DTMB program video and audio data is directly output by the main control module or is synthesized with emergency broadcast contents and then output by the output module;
the first control module receives the emergency message, executes the emergency instruction, wakes up the DTMB set-top box in advance for a necessary time period, and transmits the emergency instruction and the emergency information to the main control module;
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 is connected with the DTMB receiving module and the output module, sets receiving parameters of the DTMB receiving module, receives DTMB program video and audio data from the DTMB receiving module, executes an emergency instruction, converts the media type of emergency broadcast content, then performs synthesis processing on the emergency broadcast content to obtain emergency broadcast content, and finally enables the output module to output the emergency broadcast 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.
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 first storage module connected with the first control module and a second storage module connected with the main control module, wherein the storage content of the first storage module comprises emergency instructions and emergency information, and the storage content of the second storage module comprises emergency broadcasting content and emergency broadcasting playing content.
In another aspect of the present invention, a system for waking up an emergency broadcast by a subcarrier is further provided, comprising an emergency broadcast management platform, a frequency modulation subcarrier transmission network, a DTMB transmission network and a DTMB set-top box;
the emergency broadcast management platform generates an emergency message;
the frequency modulation subcarrier transmission network receives an emergency message from the emergency broadcast management platform, performs frequency modulation subcarrier broadcast 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 frequency modulation subcarrier broadcast is one of FM-SCA broadcast, FM-RDS broadcast, FM-RBDS broadcast and FM-DARC broadcast;
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 system comprises a frequency modulation subcarrier receiving module, a frequency modulation subcarrier decryption and analysis module and a first control module, wherein the frequency modulation subcarrier receiving module, the frequency modulation subcarrier decryption and analysis module and the first control module receive frequency modulation subcarrier broadcast signals in real time within 7 x 24 hours, detect and receive emergency messages in frequency modulation subcarrier data, wake up a DTMB set top box in time and transmit emergency instructions and emergency messages to a main control module; the main control module acquires emergency broadcast contents, and converts, synthesizes and plays the emergency broadcast contents according to emergency instructions; the invention realizes real-time detection and receiving of emergency messages in frequency modulation subcarriers, and further awakens the DTMB set-top box for emergency broadcasting.
2) The method has the advantages that the frequency modulation subcarrier receiving module, the frequency modulation subcarrier decryption and analysis module and the first control module are used for detecting and receiving the emergency message in the frequency modulation subcarrier in real time, the processing data volume is small, the power consumption is low, the method is different from a general DTMB set top box in that the DTMB broadcast television signal is received in real time and the emergency message is detected and received from DTMB data, a high-frequency processing component is involved, the power consumption is large, and the processing data volume 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, invalid or illegal emergency messages are not processed, and the DTMB set top box is not awakened, so that safe playing is guaranteed, and misoperation is avoided.
4) The first control module receives an emergency message, executes an 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, the unrelated modules are not awakened, and the power consumption of the emergency broadcast playing is optimized.
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, the length of the emergency message can be shortened, the distribution efficiency of the emergency message is improved, and the efficiency of the set top box for receiving the emergency message is also improved.
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 condition that the general DTMB set-top box can only output to a television or a sound box, the method 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 media types and outputting the media types, 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 system consists of an emergency broadcast management platform, a frequency modulation subcarrier transmission network, a DTMB transmission network and a DTMB set top box, and the system realizes the system for awakening emergency broadcast by subcarrier; the emergency broadcast system receives emergency messages from frequency modulation subcarrier signals, the distribution path of emergency broadcast is that an emergency broadcast management platform transmits the emergency broadcast to a frequency modulation subcarrier transmission network, the frequency modulation subcarrier transmission network transmits the emergency broadcast to a DTMB set top box with frequency modulation subcarrier receiving processing, while a general emergency broadcast system taking the DTMB set top box as a terminal receives the emergency messages from the DTMB broadcast television signals, the distribution path of the emergency broadcast is that the emergency broadcast management platform transmits the emergency broadcast to the DTMB transmission network, and the DTMB transmission network transmits the emergency broadcast 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 broadcast coverage range, convenient receiving and low detection power consumption of the frequency modulation subcarrier.
Drawings
FIG. 1 is a flowchart illustrating a method for waking up an emergency broadcast by a subcarrier according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a DTMB set-top box according to an embodiment of the present invention, wherein the DTMB set-top box wakes up emergency broadcast by subcarrier;
fig. 3 is a schematic structural diagram of a system for waking up emergency broadcast by using subcarriers 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 subcarrier wake-up emergency broadcast, as shown in fig. 1-3, wherein,
in one aspect of this embodiment, a method for waking up an emergency broadcast by using a subcarrier is provided, which includes the following steps:
(1) when the DTMB set top box 400 is turned off or stands by or plays a program, the frequency modulation subcarrier receiving module 1 receives a frequency modulation subcarrier broadcasting signal, frequency modulation subcarrier data are obtained through demodulation and decoding, and then the frequency modulation subcarrier decrypting and analyzing module 2 decrypts and analyzes the frequency modulation subcarrier data to obtain an emergency message;
the FM subcarrier broadcasting is one of FM-SCA broadcasting, FM-RDS broadcasting, FM-RBDS broadcasting and FM-DARC broadcasting;
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 5 receives a DTMB broadcast television signal, and obtains video and audio data of the DTMB program after demodulation, demultiplexing and decoding;
(3) the first control module 3 receives the emergency message, executes the emergency instruction, wakes up the DTMB set-top box 400 in advance for a necessary time period, and transmits the emergency instruction and the emergency information to the main control module 4, 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;
(4) the main control module 4 executes the emergency instruction, firstly converts the media type of the emergency broadcast content, and then carries out synthesis processing on the emergency broadcast content to obtain the emergency broadcast playing content;
(5) the main control module 4 controls the output module 6 to output the emergency broadcast content to the playing device, wherein 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, in the step (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 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 4, the DTMB receiving module 5 and the output module 6 are powered off;
the DTMB set-top box 400 is in standby, the main control module 4 is in sleep, and the DTMB receiving module 5 and the output module 6 are powered off;
the DTMB set-top box 400 plays a program, the main control module 4 sets receiving parameters of the DTMB receiving module 5, the DTMB receiving module 5 receives DTMB broadcast television signals, and after demodulation, demultiplexing and decoding, video and audio data of the currently played DTMB program are output by the output module 6 under the control of the main control module 4;
in step (3), the method for waking up the set top box is as follows:
(a1) if the set-top box is powered off, the first control module 3 powers on and initializes the main control module 4, and the first control module 3 directly or through the main control module 4 powers on and initializes the output module 6;
(a2) if the set-top box is in standby, the first control module 3 sends a wake-up instruction to the main control module 4, the main control module 4 restores the working state from the dormant state, and the first control module 3 directly or through the main control module 4 enables the output module 6 to be powered on and initialized;
(a3) if the set-top box plays the program, the first control module 3 has no wake-up operation.
Further, the DTMB set-top box 400 has a unique code, and in step (3), before executing the emergency instruction, the first control module 3 checks the emergency message, which includes the following specific 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 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.
On the other hand, the present embodiment provides a DTMB set-top box for waking up emergency broadcast by subcarrier, which includes a frequency modulation subcarrier receiving module 1, a frequency modulation subcarrier decryption and analysis module 2, a first control module 3, a main control module 4, a DTMB receiving module 5, and an output module 6;
the frequency modulation subcarrier receiving module 1 is connected with the frequency modulation subcarrier decryption analysis module 2, receives the frequency modulation subcarrier broadcast signals, demodulates and decodes the frequency modulation subcarrier broadcast signals to obtain frequency modulation subcarrier data, and transmits the frequency modulation subcarrier data to the frequency modulation subcarrier decryption analysis module 2;
the frequency modulation subcarrier decryption and analysis module 2 is connected with the first control module 3, decrypts and analyzes frequency modulation subcarrier data to obtain an emergency message, and transmits the emergency message to the first control module 3;
the FM subcarrier broadcasting is one of FM-SCA broadcasting, FM-RDS broadcasting, FM-RBDS broadcasting and FM-DARC broadcasting;
the emergency message comprises an emergency instruction and emergency information;
emergency information, which is emergency broadcast content;
the DTMB receiving module 5 receives DTMB broadcast television signals according to receiving parameters set by the main control module 4, and after demodulation, demultiplexing and decoding, the currently played DTMB program video and audio data is directly output by the main control module 4 or is output by the output module 6 after being synthesized with emergency broadcast contents;
the first control module 3 receives the emergency message, executes the emergency instruction, wakes up the DTMB set-top box 400 in advance for a necessary time period, and transmits the emergency instruction and the emergency information to the main control module 4;
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 4 is connected with the DTMB receiving module 5 and the output module 6, sets receiving parameters of the DTMB receiving module 5, receives DTMB program video and audio data from the DTMB receiving module 5, executes an emergency instruction, converts the media types of emergency broadcast contents, performs synthesis processing on the emergency broadcast contents to obtain emergency broadcast contents, and finally enables the output module 6 to output the emergency broadcast contents 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 digital television set top box 400 further comprises a user response module 7 connected with the main control module 4 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 8 which is connected with the main control module 4 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 first storage module 9 connected with the first control module 3 and a second storage module 10 connected with the main control module 4, wherein the storage content of the first storage module 9 comprises emergency instructions and emergency information, and the storage content of the second storage module 10 comprises emergency broadcast content and emergency broadcast playing content.
Further, the core model of the first control module 3 is STM32F030C8, and the core model of the main control module 4 is haisi hi3798MV 200.
In another aspect of this embodiment, a system for waking up an emergency broadcast by using a subcarrier is further provided, including an emergency broadcast management platform 100, a frequency modulation subcarrier 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 subcarrier transmission network 200 receives the emergency message from the emergency broadcast management platform 100, performs fm subcarrier broadcast, and transmits the fm subcarrier broadcast 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 FM subcarrier broadcasting is one of FM-SCA broadcasting, FM-RDS broadcasting, FM-RBDS broadcasting and FM-DARC broadcasting;
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 frequency modulation subcarrier receiving module 1, the frequency modulation subcarrier decryption and analysis module 2 and the first control module 3 receive frequency modulation subcarrier broadcast signals in real time, detect and receive emergency messages in frequency modulation subcarrier data, wake up the DTMB set top box 400 in time and transmit the emergency instructions and the emergency messages to the main control module 4; the main control module 4 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 emergency messages in frequency modulation subcarriers, and further awakens the DTMB set-top box for emergency broadcasting.
2) The frequency modulation subcarrier receiving module 1, the frequency modulation subcarrier decryption analysis module 2 and the first control module 3 are used for detecting and receiving the emergency message in the frequency modulation subcarrier in real time, the processing data volume is small, the power consumption is low, and the method is different from a common DTMB set top box which receives DTMB broadcast television signals in real time and detects and receives the emergency message from the DTMB data, relates to a high-frequency processing component, and is large in power consumption and large in processing data volume. 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 3 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 optimizes 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 7, 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 8 is connected with the main control module 4 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 system consists of an emergency broadcast management platform 100, a frequency modulation subcarrier transmission network 200, a DTMB transmission network 300 and a DTMB set-top box 400, and the system realizes the system for awakening emergency broadcast by subcarrier. The emergency broadcast system receives emergency messages from frequency modulation subcarrier signals, the distribution path of emergency broadcast is that an emergency broadcast management platform transmits the emergency broadcast to a frequency modulation subcarrier transmission network, the frequency modulation subcarrier transmission network transmits the emergency broadcast to a DTMB set top box with frequency modulation subcarrier receiving processing, while a general emergency broadcast system taking the DTMB set top box as a terminal receives the emergency messages from the DTMB broadcast television signals, the distribution path of the emergency broadcast is that the emergency broadcast management platform transmits the emergency broadcast to the DTMB transmission network, and the DTMB transmission network transmits the emergency broadcast 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 broadcast coverage range, convenient receiving and low detection power consumption of the frequency modulation subcarrier.
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 waking up the emergency broadcast by the subcarrier 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 frequency modulation subcarrier receiving module receives frequency modulation subcarrier broadcasting signals, frequency modulation subcarrier data are obtained through demodulation and decoding, and then the frequency modulation subcarrier decryption analysis module decrypts and analyzes the frequency modulation subcarrier data to obtain emergency messages;
the frequency modulation subcarrier broadcast is one of FM-SCA broadcast, FM-RDS broadcast, FM-RBDS broadcast and FM-DARC broadcast; 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 first control module receives an emergency message, executes an emergency instruction, wakes up the DTMB set-top box in advance for a necessary time period, and transmits the emergency instruction and the emergency information to the main control module, 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;
(4) the main control module executes an emergency instruction, firstly converts the media type of emergency broadcast content, and then carries out synthesis processing on the emergency broadcast content to obtain emergency broadcast playing content;
(5) the main control module controls the output module to output the emergency broadcast playing content to the playing device, wherein 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 of subcarrier wake-up emergency broadcast according to claim 1, wherein, in step (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 of subcarrier wake-up emergency broadcast according to claim 1, wherein, in step (1),
the DTMB set top box is powered off when the main control module, the DTMB receiving module and the output module are powered off;
the DTMB set top box is in standby state, the main control module is in sleep state, and the DTMB receiving module and the output module are powered off;
the DTMB set-top box plays a program, the main control module sets 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 program are output by the output module under the control of 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 powered off, the first control module powers on and initializes the main control module, and the first control module directly or through the main control module powers on and initializes the output module;
(a2) if the set-top box is in standby, the first control module sends a wake-up instruction to the main control module, the main control module restores the working state from the dormant state, and the first control module directly or through the main control module enables the output module to be powered on and initialized;
(a3) if the set-top box plays the program, the first control module does not have the awakening operation.
4. The method for waking up emergency broadcasting by subcarrier according to claim 1 or 2, wherein the DTMB stb has a unique code, and the first control module checks the emergency message before executing the emergency command in step (3), specifically, the method comprises:
(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. Method for subcarrier wake-up emergency broadcasting 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 DTMB set-top box for waking up emergency broadcasting by subcarriers according to any one of claims 1-5, comprising a frequency modulation subcarrier receiving module, a frequency modulation subcarrier decryption and analysis module, a first control module, a main control module, a DTMB receiving module and an output module;
the frequency modulation subcarrier receiving module is connected with the frequency modulation subcarrier decryption analysis module, receives the frequency modulation subcarrier broadcast signals, demodulates and decodes the frequency modulation subcarrier broadcast signals to obtain frequency modulation subcarrier data, and transmits the frequency modulation subcarrier data to the frequency modulation subcarrier decryption analysis module;
the frequency modulation subcarrier decryption and analysis module is connected with the first control module, decrypts and analyzes frequency modulation subcarrier data to obtain emergency information, and transmits the emergency information to the first control module;
the frequency modulation subcarrier broadcast is one of FM-SCA broadcast, FM-RDS broadcast, FM-RBDS broadcast and FM-DARC broadcast; 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 after demodulation, demultiplexing and decoding, the currently played DTMB program video and audio data is directly output by the main control module or is synthesized with emergency broadcast contents and then output by the output module;
the first control module receives the emergency message, executes the emergency instruction, wakes up the DTMB set-top box in advance for a necessary time period, and transmits the emergency instruction and the emergency information to the main control module;
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 is connected with the DTMB receiving module and the output module, sets receiving parameters of the DTMB receiving module, receives DTMB program video and audio data from the DTMB receiving module, executes an emergency instruction, converts the media type of emergency broadcast content, then performs synthesis processing on the emergency broadcast content to obtain emergency broadcast content, and finally enables the output module to output the emergency broadcast 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.
7. The DTMB set-top box for waking up emergency broadcasts by subcarriers of claim 6, further comprising a user response module connected to the main control module for responding to user operations, wherein the DTMB set-top box masks response to user operations before the emergency broadcasts are played and resumes response to user operations after the emergency broadcasts are played under standby or program playing conditions.
8. The DTMB set-top box for waking up emergency broadcasts by subcarriers according to claim 6, further comprising a peripheral power on/off module connected to the main control module for detecting a 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 waking up emergency broadcasting by subcarriers according to claim 6, further comprising a first storage module connected to the first control module and a second storage module connected to the main control module, wherein the storage contents of the first storage module comprise emergency instructions and emergency information, and the storage contents of the second storage module comprise emergency broadcasting contents and emergency broadcasting contents.
10. The system for awakening emergency broadcast by subcarrier is characterized by comprising an emergency broadcast management platform, a frequency modulation subcarrier transmission network, a DTMB transmission network and a DTMB set-top box;
the emergency broadcast management platform generates an emergency message;
the frequency modulation subcarrier transmission network receives an emergency message from the emergency broadcast management platform, performs frequency modulation subcarrier broadcast 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 subcarrier wake-up emergency broadcast of any of claims 6 to 9;
the frequency modulation subcarrier broadcast is one of FM-SCA broadcast, FM-RDS broadcast, FM-RBDS broadcast and FM-DARC broadcast; the emergency message comprises an emergency instruction and emergency information;
the emergency information is emergency broadcast content.
CN202110248137.9A 2021-03-07 2021-03-07 Method for awakening emergency broadcast by subcarrier, DTMB set top box and system Withdrawn CN112788412A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116488757A (en) * 2023-05-12 2023-07-25 北京悦视科技有限公司 Urban emergency broadcast media adaptation method and system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116488757A (en) * 2023-05-12 2023-07-25 北京悦视科技有限公司 Urban emergency broadcast media adaptation method and system

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