KR102475922B1 - DMB Emergency broadcasting system and control method thereof - Google Patents

Abstract

An embodiment of the present invention relates to a DMB emergency broadcast transmission technique which is configured to reduce the delay time of DMB disaster broadcast transmission in case of a disaster. According to one aspect of the present invention, the DMB emergency broadcast transmission method is performed in a DMB emergency broadcast transmission device of a DMB emergency broadcast system. The method comprises: a step (a) of receiving a DMB emergency broadcast video from the outside; a step (b) of separating audio and video from the received DMB emergency broadcast video; a step (c) of converting the separated audio and video in parallel, respectively, according to preset audio and video formats; a step (d) of generating, during the delay time from a first point in time when the conversion of the audio is completed to a second point in time when the conversion of the video is completed, a first DMB emergency broadcast video by combining the converted audio and a pre-stored demo video and generating a second DMB emergency broadcast video by combining the converted audio and the converted video from the second point in time; and a step (e) of transmitting the generated first DMB emergency broadcast video from the first point in time to the second point in time, and transmitting the generated second DMB emergency broadcast video from the second point in time.

Description

DMB emergency broadcasting transmission device and method {DMB Emergency broadcasting system and control method thereof}

The present invention relates to a DMB emergency (or referred to as a disaster) broadcasting transmission technology, and more particularly, to a DMB emergency broadcasting transmission device and a control method for reducing the delay time of transmitting a DMB emergency broadcasting when a disaster situation occurs.

In general, DMB (Digital Multimedia Broadcasting) broadcasting is possible to receive a signal from a base station and watch broadcasting in normal cases, but it is difficult to receive signals in this way in shadow areas such as tunnels and underground spaces. The DMB disaster (emergency) broadcasting system receives regular broadcasting signals from the base station through outdoor antennas installed outside the tunnels and underground. On the other hand, when a disaster situation occurs in the tunnel and underground space, the disaster signal generation unit in the DMB disaster broadcasting system transmits disaster information corresponding to the disaster situation in the tunnel and underground space, so that you can watch regular broadcasting. Disaster information can be received from the DMB terminal so that people can evacuate.

That is, when a disaster situation occurs in the tunnel or underground space, the disaster signal generation unit in the DMB disaster broadcasting system transmits disaster information corresponding to the disaster situation in the tunnel or underground space. Disaster information is transmitted by receiving information or receiving signals from sensors installed in tunnels/underground facilities.

However, the conventional DMB emergency broadcasting system receives disaster safety video from organizations such as the Ministry of Disaster and Safety through Ethernet, encodes (converts) the video according to the format of regular DMB broadcasting, and relays it. For example, according to KBS, MBC, YTN, etc.), the video and audio standards are different, and the video is in about 4 to 5 types of formats (eg, MPEG, H.265, etc.), and Since audio is transmitted after converting (encoding) the source video into each format in about 2 to 3 formats (eg, BSAC, AAC+, etc.), a delay of several seconds or more occurs from reception to transmission. Accordingly, in the conventional DMB emergency broadcasting system, there is a problem in that a delay of several seconds or more occurs from reception to transmission of disaster broadcasting according to the format of regular DMB broadcasting.

Registered Patent Publication No. 10-1861752 (2018.05.21.)

The present invention is to solve the above-mentioned conventional problems, and its object is to provide a DMB emergency broadcast transmission device and method for reducing the delay time of DMB disaster broadcast transmission when a disaster situation occurs.

In order to achieve the above object, a DMB emergency broadcast transmission apparatus according to an aspect of the present invention includes a receiving unit for receiving a DMB emergency broadcast image from the outside; a separator for separating audio and video from the received DMB emergency broadcasting image; a converter for converting the separated audio and video in parallel according to preset audio and video formats; During the delay time from the first time point in which the audio conversion is completed to the second time point in which the video conversion is completed, a first DMB emergency broadcast video is generated by combining the converted audio and a pre-stored demo video, and the second time point a generation unit for generating a second DMB emergency broadcasting image by combining the converted audio and the converted video; and a transmitting unit configured to transmit the generated first DMB emergency broadcasting video from the first time point to the second time point, and to transmit the generated second DMB emergency broadcasting image from the second time point. .

to achieve the foregoing purpose A DMB emergency broadcast transmission method according to another aspect of the present invention is a method performed by a DMB emergency broadcast transmitter of a DMB emergency broadcast system, comprising the steps of: (a) receiving a DMB emergency broadcast image from the outside; (b) separating audio and video from the received DMB emergency broadcasting image; (c) converting the separated audio and video in parallel according to preset audio and video formats; (d) During the delay time from the first point in time when the audio conversion is completed to the second point in time when the video conversion is completed, a first DMB emergency broadcasting image is generated by combining the converted audio and a pre-stored demo video; generating a second DMB emergency broadcasting image by combining the converted audio and the converted video from a second point in time; and (e) transmitting the generated first DMB emergency broadcasting video from the first time point to the second time point, and transmitting the generated second DMB emergency broadcasting video from the second time point onwards. can

The demo video may include at least one of a sample moving image and a sample still image converted and stored in advance according to the preset video format, and the video format includes at least one of MPEG, H.264, and H.265. and the audio format may include at least one of BSAC and AAC+.

In order to achieve the above object, according to another aspect of the present invention, it is possible to provide a computer-readable recording medium on which a program for executing the DMB emergency broadcast transmission method in a computer is recorded.

In order to achieve the above object, according to another aspect of the present invention, an application stored in a computer-readable recording medium can be provided to execute the DMB emergency broadcast transmission method in combination with hardware.

In order to achieve the above object, according to another aspect of the present invention, it is possible to provide a computer program stored in a computer-readable recording medium in order to execute the DMB emergency broadcast transmission method in a computer.

As described above, according to various aspects of the present invention, an effect of reducing the delay time of DMB disaster broadcast transmission when a disaster situation occurs is created.

In other words, it is very important to reduce this delay time because a delay of several seconds in delivering disaster broadcasting can avoid or prepare for a disaster situation. , Third-party collisions are occurring a lot, and in the case of a car in this situation, it can reach from hundreds of meters to several kilometers in a few seconds, so reducing this delay time can be expected to be very effective in preventing accidents. In addition, it is possible to expect the effect of helping people avoid disaster accidents or prepare for disaster situations through prompt transmission of disaster broadcasting in buildings or underground facilities.

1 is a configuration diagram of a DMB emergency broadcast transmission system according to an embodiment of the present invention;
2 is a configuration diagram of a DMB emergency broadcast transmission device according to an embodiment of the present invention;
3 is a flowchart of a DMB emergency broadcast transmission method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, the same components should have the same numerals as much as possible, even if they are displayed on different drawings. In addition, when it is determined that a detailed description of a known configuration or function related to an embodiment of the present invention may obscure the gist of the present invention, the detailed description will be omitted.

1 is a block diagram of a DMB emergency broadcast transmission system according to an embodiment of the present invention.

Referring to FIG. 1, the DMB emergency broadcasting transmission system according to an embodiment of the present invention transmits regular DMB from a base station (not shown) through an outdoor antenna (DMB Antenna) of a DMB emergency broadcasting transmission device 2 installed outside a tunnel and underground. It receives a broadcasting signal, and the regular DMB broadcasting signal input in this way normally relays broadcasting to tunnels and underground spaces through a plurality of transmitters #1 to #n (4 to 6), so that DMB terminals in tunnels and underground spaces (eg : A DMB terminal installed in a vehicle, a radio or a smartphone with a DMB reception function, etc.) (8) can also make it possible to watch regular broadcasts.

In addition, when a disaster situation occurs in a tunnel or underground space, the DMB emergency broadcast transmission device 2 of the DMB emergency broadcast transmission system according to an embodiment of the present invention is an institutional server of the Ministry of Disaster and Safety through the management PC 3 ( DMB terminal (8) that receives disaster information from 1) or receives disaster signals from sensors (not shown) installed in tunnels/underground facilities and transmits disaster information corresponding to disaster situations in tunnels or underground spaces to watch regular broadcasts. It is possible to receive disaster information in order to evacuate people.

As described above, the emergency broadcast transmitting device 2 of the DMB emergency broadcasting system according to an embodiment of the present invention receives disaster safety video from the agency server 1 such as the Ministry of Disaster and Safety through Ethernet, etc. and converts the video to regular DMB. It is encoded (converted) according to the format of the broadcast and relayed and transmitted to transmitters #1 to #n (4 to 6) in the tunnel or underground space. ) is first encoded, and a disaster broadcast is transmitted first along with a sample video (Video) that has already been converted into the format of each channel that has already been prepared. By transmitting video and audio together in sync with the audio being played, the delay due to the conventional encoding time can be reduced as much as possible.

In transmitting disaster broadcasting, it is very important to reduce the delay time when transmitting disaster broadcasting because a delay of several seconds can avoid or prepare for a disaster situation. For example, many secondary and tertiary collisions are occurring due to traffic congestion in tunnels due to recent collisions between vehicles inside tunnels. Therefore, many accidents can be prevented by reducing the delay time for transmitting disaster broadcasting according to the present invention. In addition, in buildings or underground facilities, people can avoid disaster accidents or prepare for disaster situations through rapid disaster broadcast transmission according to the present invention.

FIG. 2 is a block diagram of the DMB emergency broadcast transmitter 2 of FIG. 1 according to an embodiment of the present invention. As shown in the figure, the receiver 21, the separator 23, and the converter 25 , a generating unit 27, and a sending unit 29.

The receiving unit 21 is for receiving the DMB emergency broadcasting video from the outside, for example, as illustrated in FIG. can receive

Separator 23 is for separating audio and video from the DMB emergency broadcast video received by the receiver 21.

The conversion unit 25 is for converting the audio and video separated by the separation unit 23 in parallel according to a preset audio format and a preset video format, respectively, for example, the separated video and audio Conversion (or encoding) is performed according to a predetermined corresponding format for each channel (for example, video format is H.264, H.265, etc..., audio format is AAC+, BSAC, etc...).

Hereinafter, for convenience of description, a time point when audio conversion is completed by the conversion unit 25 is referred to as a first time point, and a time point when video conversion is completed is referred to as a second time point.

The conversion unit 25 starts conversion of audio and video at the same time, but converts the audio and video independently and in parallel to each other. At this time, the relatively small audio file finishes conversion before the video file , Accordingly, a delay time occurs between a first time point in which audio conversion is completed and a second time point in which video conversion is completed.

The generation unit 27 combines the converted audio file and the video file to create a DMB emergency broadcasting video for transmission. DMB emergency broadcasting video for transmission can be created by combining pre-stored demo video files.

In this embodiment, the demo video file is pre-converted according to a video format preset for each channel (eg, video format is H.264, H.265, etc..., audio format is AAC+, BSAC, etc...) and then DMB It may include at least one of a sample moving image and a sample still image pre-stored in a memory (not shown) of the emergency broadcast transmission device 2 .

The generation unit 27 converts the audio file converted through the conversion unit 25 and the demo video pre-stored in a memory (not shown) during the delay time from the first time when the audio conversion is completed to the second time when the video conversion is completed. may be combined through a transmission sequence multiplexer (TS Multiplexer) to generate the first DMB emergency broadcast video for transmission.

The generation unit 27 combines the audio and video converted by the conversion unit 25 and output from the second point in time when the video conversion is completed through a transmission multiplexer (TS Multiplexer) to produce a second DMB emergency broadcasting video for transmission. At this time, at the second point in time, the TS (Transport Stream) Multiplexer determines the playback time of the audio currently being played, and combines the two to match (synchronize) the encoded video to the audio playback time to generate the 2nd DMB An emergency broadcast video can be created.

The transmitting unit 29 transmits the DMB emergency broadcasting video generated and outputted by the generating unit 27 to transmitters #1 to #n (4 to 6), and the generating unit 27 The first DMB emergency broadcast video generated through ) may be transmitted, and the second DMB emergency broadcast video generated through the generation unit 27 may be transmitted from a second point in time.

The transmitting unit 29 transmits the DMB emergency broadcasting video in real time according to the TS protocol through OFDM modulation, so that users in a tunnel or underground can view the corresponding emergency broadcasting through the DMB terminal 8.

FIG. 3 is a flowchart of a DMB emergency broadcast transmission method according to an embodiment of the present invention. Since it is applied to the DMB emergency broadcast transmission device 2 of FIGS. 1-2, the operation of the corresponding device 2 will be described in parallel.

First, when a disaster situation occurs, the receiver 21 of the DMB emergency broadcast transmitter 2 receives disaster safety images from the agency server 1 such as the Ministry of Disaster and Safety through the management PC 3 (S310), and the separation unit 23 ) separates Video and Audio from the disaster safety image received through the receiving unit 21 in step S310 (S330).

Subsequently, the conversion unit 25 starts converting the video and audio separated in step S330 according to the format (Video: H.264 ..., Audio: AAC+, BSAC, ...) for each channel (S350).

In step S350, Audio and Video are independently converted (S351 and S352), and the relatively small audio file is converted first (S371 to S372).

Subsequently, the generation unit 27 combines the audio file and video file converted and output by the conversion unit 25 or a demo video file previously stored in a memory (not shown) to obtain a DMB emergency broadcast video for transmission and a DMB video for transmission. Make (S370).

In step S370, when the first point in time when the conversion of the audio file is completed (S371 to S372), the generation unit 27 transmits the DMB information received from the DMB emergency broadcasting system to the external antenna through SC (Synchronization Channel) and FIC (Fast Information Channel). ) The information is imported as it is and the video has not yet been converted, so the demo video (S374) pre-stored in the memory of the MSC (Main Service Channel) and the converted audio file (S372) are combined through the TS Multiplexer and transmitted as one video. A first DMB emergency broadcasting video is created (S376: S372+S374).

On the other hand, in step S370, when the second point of time when the conversion of the video file is completed (S375), the generation unit 27 determines the playback time of the audio currently playing in the TS multiplexer, and converts (encoding) the video (S375) is synthesized according to the playback time of the corresponding audio (S372) to create a second DMB emergency broadcast video for transmission (S376: S372 + S375).

Finally, the transmitting unit 29 of the DMB emergency broadcast transmitting device 2 transmits the first DMB emergency broadcasting video generated by the generation unit 27 in step S370 from the first time point to the second time point, and transmits the second DMB emergency broadcasting image. From this point on, the 2nd DMB emergency broadcasting video generated by the generation unit 27 in step S370 is transmitted. Users in the basement or in the basement can view the corresponding disaster broadcasting through the DMB terminal 8.

On the other hand, according to the DMB emergency broadcast transmission method according to the embodiment of the present invention described above, a computer-readable recording medium in which a program for executing the corresponding method in a computer can be implemented.

On the other hand, according to the DMB emergency broadcast transmission method according to the embodiment of the present invention described above, an application stored in a computer-readable recording medium can be implemented in order to execute the method in combination with hardware.

On the other hand, according to the DMB emergency broadcast transmission method according to the above-described embodiment of the present invention, a computer program stored in a computer-readable recording medium may be implemented in order to execute the corresponding method on a computer.

For example, as described above, the DMB emergency broadcast transmission method according to an exemplary embodiment of the present invention includes a computer-readable recording medium including program instructions for performing various computer-implemented operations or an application stored on such a recording medium. can be implemented as The computer readable recording medium may include program instructions, local data files, local data structures, etc. alone or in combination. The recording medium may be specially designed and configured for the embodiment of the present invention, or may be known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical recording media such as CD-ROMs and DVDs, magneto-optical media such as floptical disks, and ROMs, RAMs, flash memories, and the like. A hardware device specially configured to store and execute the same program instructions is included. Examples of program instructions may include high-level language codes that can be executed by a computer using an interpreter or the like as well as machine language codes generated by a compiler.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

2: DMB emergency broadcast transmission device
4,6: Transmitter
8: DMB Terminal
21: receiver
23: separation unit
25: conversion unit
27: generating unit
29: transmission unit

Claims (11)

a receiving unit for receiving DMB emergency broadcasting images from the outside;
a separator for separating audio and video from the received DMB emergency broadcasting image;
a converter for converting the separated audio and video in parallel according to preset audio and video formats;
During the delay time from the first time point in which the audio conversion is completed to the second time point in which the video conversion is completed, a first DMB emergency broadcast video is generated by combining the converted audio and a pre-stored demo video, and the second time point a generation unit for generating a second DMB emergency broadcasting image by combining the converted audio and the converted video; and
a transmitting unit configured to transmit the generated first DMB emergency broadcasting video from the first time point to the second time point, and to transmit the generated second DMB emergency broadcasting image from the second time point;
DMB emergency broadcast transmission device comprising a. According to claim 1,
The demo video includes at least one of a sample moving image and a sample still image converted and stored in advance according to the preset video format. According to claim 1,
The video format includes at least one of MPEG, H.264, and H.265. According to claim 1,
The DMB emergency broadcast transmission device, characterized in that the audio format includes at least one of BSAC and AAC +. As a method performed in the DMB emergency broadcast transmission device of the DMB emergency broadcast system,
(a) receiving a DMB emergency broadcast video from the outside;
(b) separating audio and video from the received DMB emergency broadcasting image;
(c) converting the separated audio and video in parallel according to preset audio and video formats;
(d) During the delay time from the first point in time when the audio conversion is completed to the second point in time when the video conversion is completed, a first DMB emergency broadcasting image is generated by combining the converted audio and a pre-stored demo video; generating a second DMB emergency broadcasting image by combining the converted audio and the converted video from a second point in time; and
(e) transmitting the generated first DMB emergency broadcasting video from the first time point to the second time point, and transmitting the generated second DMB emergency broadcasting video from the second time point;
DMB emergency broadcast transmission method comprising a. According to claim 5,
The DMB emergency broadcast transmission method, characterized in that the demo video includes at least one of a sample moving image and a sample still image converted and stored in advance according to the preset video format. According to claim 5,
The DMB emergency broadcast transmission method, characterized in that the video format includes at least one of MPEG, H.264, and H.265. According to claim 5,
The DMB emergency broadcast transmission method, characterized in that the audio format includes at least one of BSAC and AAC +. A computer-readable recording medium recording a program for executing the DMB emergency broadcast transmission method according to any one of claims 5 to 8 in a computer. An application stored in a computer-readable recording medium to execute the DMB emergency broadcast transmission method of any one of claims 5 to 8 in combination with hardware. A computer program stored in a computer-readable recording medium in order to execute the DMB emergency broadcast transmission method according to any one of claims 5 to 8 in a computer.

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