KR101920304B1 - Method and apparatus for providing digital broadcast signal - Google Patents

Abstract

An apparatus and method for providing a digital broadcast signal are provided. A digital broadcast signal providing apparatus detects a first disaster message signal from a terrestrial DMB signal and generates a second disaster message based on a value of a first field of a first disaster message signal, A disaster broadcasting section for generating a disaster message signal, and a broadcast signal relay section for controlling the dispatch of a second disaster message signal transmitted from the disaster broadcasting section.

Description

[0001] The present invention relates to a method and apparatus for providing a digital broadcast signal,

The present invention relates to an apparatus and a method for providing a digital broadcast signal, and more particularly, to an apparatus and method for providing a digital broadcast signal by using an Automatic Emergency Alert Service (AEAS) And to provide a digital broadcast signal for providing a disaster warning service for a shadow area through multimedia.

T-DMB (Terrestrial Digital Multimedia Broadcasting) is a broadcasting medium that is excellent in mobility and portability, can be utilized even in case of power failure, and can transmit disaster information quickly and accurately in multimedia such as audio and video. T-DMB supports MPEG-4 Advanced Video Coding (AVC) video compression data and MPEG-4 bit-sliced audio coding (BSAC) audio compression through stream modes defined in the European Digital Audio Broadcating (DAB) Multiplexes MPEG-4 Binary Format for Scenes (BIFS) data for data and interactive data broadcasting into an MPEG-4 SL (Sync Layer) and an MPEG-2 TS (Transport Stream), and then transmits the multiplexed data to a stream to which an error protection mechanism is applied .

The disaster broadcasting technology utilizing the features of the T-DMB and DAB broadcasting networks has been developed in Korea and transmits a disaster message using FIDC (Fast Information Data Channel). This disaster warning service technology for T-DMB shaded areas was standardized in 2006 and has been actually used after being broadcasted in 2009. However, since most of the terminals that are deployed do not support the standard, ordinary people are not aware of the emergency alert broadcasting.

Also, in a specific shadow area such as a tunnel and an underground space in the T-DMB and DAB broadcasting service areas, the reception environment of the T-DMB is poor and it is difficult to receive the broadcasting service. In order to solve this problem, in case of a disaster situation, the T-DMB broadcasting is relayed, and in case of a disaster, disaster broadcasting is performed so that the T-DMB and DAB broadcasting service can be normally received without the operation of the T- T-DMB and DAB disaster broadcasting system for tunnel transmission were developed.

However, the above-described system for the T-DMB and DAB disaster broadcasting for the specific transliteration area has a problem that the disaster situation can not be received through video and audio in a situation where the receiver is turned off. Particularly, there is a problem in that disaster broadcasting can not be provided in a specific shade area under the condition that the T-DMB watching is prohibited by the law during the recent operation.

Therefore, there is a need for techniques to provide disaster broadcasting in certain shadow areas such as tunnels and underground spaces.

Korean Patent No. 10-1253159 (" Digital broadcast signal and apparatus and method for processing the signal ", published by LG Electronics Co., Ltd., Nov. 29, 2007)

It is an object of the present invention to solve the above-mentioned problems and to provide an automatic emergency alert service (AEAS) And an apparatus and method for providing a digital broadcast signal for providing a disaster warning service for a shadow area through multimedia such as voice.

According to an aspect of the present invention, there is provided an apparatus for providing a digital broadcast signal, the apparatus comprising: a first disaster message signal detecting unit for detecting a first disaster message signal from a terrestrial DMB signal; A disaster broadcasting unit for generating a second disaster message signal including disaster broadcast activation data for a disaster alert service for a shade area; And a broadcast signal relay unit for controlling transmission of the second disaster message signal transmitted from the disaster broadcasting unit.

The first field is a FIG 5 Extension 2 field which is a Fast Information Data Channel (FIDC) in a Fast Information Channel (FIC) of the first disaster message signal.

Wherein the disaster broadcasting unit includes a terminal activating unit for generating a second disaster message signal by changing a structure of the first disaster message signal according to a result of determining whether disaster broadcasting data is included in the first field .

Wherein the terminal activation unit changes the structure of the first disaster message signal when the disaster broadcast data is not included in the first field and then transmits the disaster broadcast activation data and the shade area message for the shade area emergency alert service, And an issuing organization is added to generate the second disaster message signal.

Wherein the terminal activation unit generates a structure change disaster message signal by changing a structure of a second field not used in the first disaster message signal and displays the disaster broadcast activation data in a first field of the structure change disaster message signal And displays the message issuing organization in a message segment of the structure change disaster message signal.

The terminal activation unit generates the message segment by dividing the structure change disaster message signal, and adds a message issuing organization for the disaster alert service for the shade area to the header table of the message segment.

Wherein the terminal activation unit displays the disaster broadcast activation data instead of the disaster broadcast data included in the first field when the disaster broadcast data is included in the first field or displays the disaster broadcast data included in the first field And generating the second disaster message signal by adding the disaster broadcast activation data.

The terminal activation unit generates the FIG message signal including the message segment as the first disaster message signal and generates the FIG message signal based on the value of the second field that is not used in the FIG message signal in place of the disaster broadcast data included in the first field And displays the disaster broadcast activation data.

The terminal activation unit adds the disaster broadcast activation data to a second field for displaying a short message while maintaining the disaster broadcast data included in the first field of the first disaster message signal.

The broadcast signal relay unit receives the modulated signal of the terrestrial DMB signal through the first input terminal and receives the modulated signal by multiplexing the second disaster message signal through the second input terminal and selectively transmits And a frequency selection unit.

According to another aspect of the present invention, there is provided a method of providing a digital broadcast signal, comprising: detecting a first disaster message signal from a terrestrial DMB signal; Generating disaster broadcast activation data for providing a disaster alert service for a shadow area; Generating a second disaster message signal including the disaster broadcast activation data based on a value of a first field of the first disaster message signal; And delivering the second emergency message signal to be controlled to be controlled.

The first field is a FIG 5 Extension 2 field which is a Fast Information Data Channel (FIDC) in a Fast Information Channel (FIC) of the first disaster message signal.

The generating of the second disaster message signal may include: determining whether disaster broadcast data is included in the first field; Generating a second disaster message signal by changing a structure of the first disaster message signal when the first field does not include the disaster broadcast data; And generating the second disaster message signal without changing the structure of the first disaster message signal when the first field includes the disaster broadcast data.

Generating a structure change disaster message signal by changing a structure of a second field not used in the first disaster message signal when the first field does not include the disaster broadcast data; Displaying the disaster broadcast activation data in a first field of the structure change disaster message signal; And displaying a message issuing organization for the shaded area disaster alert service in a message segment of the reshape message.

Wherein the step of displaying the message issuing authority comprises: dividing the structured change disaster message signal to generate the message segment; And adding the message issuing authority to a table of a header of the message segment.

And generating the second disaster message signal by displaying the disaster broadcast activation data instead of the disaster broadcast data included in the first field when the first field includes the disaster broadcast data.

The step of displaying the disaster broadcast activation data may include generating a FIG message signal including a message segment of the first disaster message signal; And displaying the disaster broadcast activation data instead of the disaster broadcast data included in the first field according to a value of a second field not used in the FIG message signal.

And generating the second disaster message signal by adding the disaster broadcast activation data while maintaining the disaster broadcast data included in the first field when the first field includes the disaster broadcast data .

Wherein the adding of the disaster broadcast activation data comprises adding the disaster broadcast activation data to a second field indicating a short message while maintaining the disaster broadcast data included in the first field of the first disaster message signal And a control unit.

According to an apparatus and method for providing a digital broadcast signal, disaster broadcast activation data for a disaster alert service for a shadow area is generated using the T-DMB AEAS (Automatic Emergency Alert Service) information, , It is possible to automatically activate the terminal in a specific shaded area such as a tunnel and an underground space, thereby realizing disaster such as video and audio service of T-DMB and DAB It is possible to provide a multimedia service for broadcasting.

In addition, according to the embodiment of the present invention, it is possible not only to transmit an existing disaster message to a general disaster situation without changing the standard of the AEAS standard, but also to transmit a disaster broadcast video related to disaster information sent in text to the T- .

FIG. 1 is a schematic view of a digital broadcast signal providing apparatus according to an embodiment of the present invention. Referring to FIG.
FIG. 2 is a block diagram showing the digital broadcast signal providing apparatus shown in FIG. 1 in more detail.
3 is a diagram schematically showing a protocol stack and a layer-by-layer frame for a shaded area emergency alert service according to an embodiment of the present invention.
4 is a diagram schematically illustrating a configuration of a structure change disaster message according to an embodiment of the present invention.
5 is a diagram illustrating an example of generating a disaster message for a transliteration area by adding a message issuing organization for providing a disaster warning service for a shadow area in the structure change disaster message shown in FIG.
FIG. 6 is a diagram schematically showing field-specific meanings of the structure change disaster message shown in FIG.
FIG. 7 is a diagram schematically showing the configuration and field meanings of the DMB channel switching field shown in FIG.
8 is a view illustrating an example of providing a disaster warning service for a shadow area using an existing disaster message without changing the standard of the AEAS standard according to another embodiment of the present invention.
9 is a view showing another example of providing a disaster warning service for a shadow area using an existing disaster message without changing the standard of the AEAS standard according to the embodiment of the present invention.
10 is a flowchart illustrating a method for providing a disaster alert service for a shadow area according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate the understanding of the present invention, the same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

FIG. 1 is a schematic view of a digital broadcast signal providing apparatus according to an embodiment of the present invention. Referring to FIG. FIG. 2 is a block diagram showing the digital broadcast signal providing apparatus shown in FIG. 1 in more detail.

1 and 2, the digital broadcasting signal providing apparatus 10 according to the exemplary embodiment of the present invention automatically activates a receiving terminal in a specific shade area such as a tunnel and an underground space, Provide alarm service. The digital broadcast signal providing apparatus 10 outputs a digital disaster broadcast signal including information related to a disaster in case of a disaster, and outputs a digital broadcast signal in the event of a disaster. The digital broadcast signal providing apparatus 10 includes a broadcast signal receiving unit 100, a broadcast signal relay unit 200, a disaster broadcast unit 300, and a broadcast signal transmitting unit 400.

The broadcast signal receiving unit 100 receives and amplifies the T-DMB RF (hereinafter, referred to as "terrestrial DMB signal") and transmits the amplified terrestrial DMB signal to the broadcast signal relay unit 200 and the disaster broadcast unit 300 ). The broadcast signal receiving unit 100 includes a receive antenna 110 and a low noise amplifier (LNA) 120.

The receiving antenna 110 receives the terrestrial DMB signal. The receiving antenna 110 transmits the terrestrial DMB signal to the low noise amplifier 120.

The low noise amplifier 120 amplifies the terrestrial DMB signal. The low noise amplifier 120 transmits the amplified terrestrial DMB signal to the broadcasting signal relay unit 200 and the disaster broadcasting unit 300.

The broadcast signal relay unit 200 generates a digital broadcast signal using the amplified terrestrial DMB signal transmitted from the broadcast signal receiving unit 100 and delivers the digital broadcast signal to the broadcast signal transmitter 400. [ The broadcast signal relay unit 200 receives a disaster broadcast multiplex signal from the disaster broadcast unit 300 in the event of a disaster, generates a digital disaster broadcast signal, and transmits the digital disaster broadcast signal to the broadcast signal transmitter 400.

The broadcast signal relay unit 200 includes a down converter 210 ₁ -210 ₃ , a digital signal processor 220 ₁ -220 ₃ , an intermediate frequency selector 230 ₁ -230 ₃ And an up converter 240 ₁ -240 ₃ . The broadcast signal relay unit 200 according to the embodiment of the present invention assumes that a digital broadcast signal is distributed and processed in three paths (path1-path3) in the event of a disaster. Here, the path path ₁ is formed through the down-conversion unit 210 ₁ , the signal processing unit 220 ₁ , the intermediate frequency selection unit 230 ₁ , and the up-conversion unit 240 ₁ , portion (210 _2), a signal processing unit (220 _2), an intermediate frequency selection unit (230 ₂₎ and are formed through the up-converter (240 _2), the path (path3) is down-converted portion (210 _3, a signal processing unit 220 ₃ , an intermediate frequency selection unit 230 ₃ , and an up-conversion unit 240 ₃ .

The down conversion units 210 ₁ -210 ₃ receive the amplified terrestrial DMB signals from the broadcasting signal receiving unit 100. The down conversion units 210 ₁ -210 ₃ convert the amplified terrestrial DMB signal into an intermediate frequency signal to generate a terrestrial DMB IF signal. The down conversion unit 130 transmits the terrestrial DMB IF signal to the signal processing units 220 ₁ -220 ₃ .

The signal processing units 220 ₁ -220 ₃ remove the feedback signal of the terrestrial DMB IF signal and perform a channel equalization process, that is, a digital signal process. The signal processing units 220 ₁ -220 ₃ transmit the terrestrial DMB IF signal subjected to the digital signal processing to intermediate frequency selection units 240 ₁ -240 ₃ .

The intermediate frequency selection units 230 ₁ -230 ₃ are IF (Intermediate Frequency) switches and include input terminals IN _{1 and} IN ₂ and an output terminal OUT, respectively. The input terminals IN1 of the intermediate frequency selection units 230 ₁ -230 ₃ are connected to the corresponding signal processing units 220 ₁ -220 ₃ and the input terminals IN _{1 of the} intermediate frequency selection units 230 ₁ -230 ₃ IN2 are connected to the corresponding COFDM modulators 340 ₁ -340 ₃ of the disaster broadcasting unit 300, respectively. The output terminals OUT of the intermediate frequency selection units 230 ₁ -230 ₃ are connected to the corresponding up-conversion units 240 ₁ -240 ₃ , respectively. The intermediate frequency selection units 230 ₁ -230 ₃ receive the terrestrial DMB IF signals from the signal processing units 220 ₁ -220 ₃ when they are not in a disaster occurrence situation. The intermediate frequency selection units 230 ₁ -230 ₃ receive a control signal from a signal control unit (not shown) for controlling the channel selection of the digital broadcast signal providing apparatus 10, and generate a terrestrial DMB IF signal To the up converters 250 ₁ -250 ₃ . Meanwhile, the intermediate frequency selection units 230 ₁ -230 ₃ receive IF-modulated disaster multiplexed signals from the COFDM modulation unit 340 of the disaster broadcasting unit 300 in the event of a disaster. The intermediate frequency selection units 230 ₁ -230 ₃ selectively deliver the disaster multiplexed signal to up converters 250 ₁ -250 ₃ according to a control signal transmitted from a signal controller .

The up-conversion units 240 ₁ -240 ₃ receive the terrestrial DMB IF signal from the intermediate-frequency selection units 230 ₁ -230 _{3 that} have undergone the digital signal processing if the event is not a disaster occurrence situation. The up-converting units 240 ₁ -240 ₃ convert the terrestrial DMB IF signal into an RF signal, that is, a digital broadcasting signal. The up-converting units 240 ₁ -240 ₃ transmit the digital broadcasting signal to the broadcasting signal transmitting unit 400. Meanwhile, the upconverters 240 ₁ -240 ₃ receive the disaster multiplex signal from the intermediate frequency selectors 230 ₁ -230 _{3 in the} event of a disaster. The up-conversion units 240 ₁ -240 ₃ convert the disaster multiplexed signal into an RF signal, that is, a digital disaster broadcast signal. The up-converting units 240 ₁ -240 ₃ transmit the digital disaster broadcasting signal to the broadcasting signal transmitting unit 400.

The disaster broadcasting unit 300 generates a digital disaster broadcasting signal using the amplified terrestrial DMB signal transmitted from the broadcasting signal receiving unit 100 and transmits the digital disaster broadcasting signal to the broadcasting signal relay unit 200. The disaster broadcasting unit 300 includes a disaster information encoding unit 310, a terminal activation unit 320, a broadcast signal multiplexing unit 330, and a COFDM modulation unit 340.

The disaster information encoding unit 310 receives disaster broadcast source data corresponding to a disaster situation acquired through monitoring at a disaster monitoring center (not shown) such as a water management center and a matching system. The disaster information encoding unit 310 encodes the disaster broadcast source data to generate disaster broadcast encoded data. The disaster information encoding unit 310 transmits the disaster broadcast encoded data to the terminal activation unit 320.

The terminal activation unit 320 is an Automatic Emergency Alert Service (AEAS) generator. The terminal activation unit 320 receives the disaster broadcast encoded data from the disaster information encoding unit 310. The terminal activation unit 320 receives the amplified terrestrial DMB signal from the broadcast signal receiving unit 100. The terminal activation unit 320 extracts and analyzes an FIC (Fast Information Channel) from the amplified terrestrial DMB signal and detects a disaster message (hereinafter referred to as "existing disaster message") generated according to the AEAS standard. The terminal activation unit 320 generates disaster broadcast activation data using the disaster broadcast encoded data. Here, the disaster broadcast activation data is generated by activating a receiving terminal deactivated in a specific shade area such as a tunnel and an underground space to wake-up the disaster alert service, And data processed using disaster broadcast coded data in accordance with the channel configuration in consideration of the parameters of the broadcast service. Then, the terminal activation unit 320 generates a disaster message for a transliteration area using the existing disaster message. More specifically, the terminal activation unit 320 determines whether or not disaster broadcast data is included in the FIG 5 Extension 2 field (hereinafter referred to as "FIG 5/2 field") of the existing disaster message. If the disaster broadcast data is not included in the FIG 5/2 field of the existing disaster message, the terminal activation unit 320 generates a disaster message (hereinafter referred to as a "structure change disaster message") in which the structure of the existing disaster message is changed do. The terminal activation unit 320 generates a disaster message for a transliteration area by adding a newly generated disaster broadcast activation data and a message issuing organization to a structure change disaster message for providing a disaster alert service for a shadow area. Meanwhile, when the FIG 5/2 field of the existing disaster message includes the disaster broadcast data, the terminal activation unit 320 displays the newly generated disaster broadcast activation data instead of the disaster broadcast data displayed in the existing disaster message, A disaster message for a transliteration area is generated by adding the newly generated disaster broadcasting activation data while maintaining the disaster broadcasting data shown in FIG.

The broadcast signal multiplexing unit 330 includes MUX (Multiplexer) modules 330 ₁ -330 ₃ . The MUX modules 330 ₁ -330 ₃ receive the disaster message for the transliteration area from the terminal activation unit 320. The MUX module (330 ₁ -330 ₃ ) multiplexes the disaster message for the transliteration area. The MUX modules 330 ₁ -330 ₃ generate a multiplexed signal (hereinafter referred to as a "disaster broadcast multiplex signal") and deliver it to the COFDM modulator 340.

The COFDM modulator 340 includes a COFDM (Modulated Orthogonal Frequency Division Multiplexing) modulator 340 ₁ -340 ₃ . At this time, the COFDM modulator 340 ₁ is connected to the intermediate frequency selector 240 ₁ of the broadcast signal repeater 200, the COFDM modulator 340 ₂ is connected to the intermediate frequency selector 240 ₂ , The COFDM modulator 340 ₃ is connected to the intermediate frequency selector 240 ₃ . The COFDM modulators 340 ₁ -340 ₃ receive the disaster multiplex signal from the broadcast signal multiplexer 330. The COFDM modulators 340 ₁ -340 ₃ modulate the disaster multiplexed signal in the form of an IF signal and transmit it to the corresponding intermediate frequency selection units 240 ₁ -240 _{3 of} the broadcast signal relay unit 200.

The broadcast signal transmission unit 400 receives the digital broadcast signal or the digital disaster broadcast signal from the up-converter units 250 ₁ -250 ₃ . The broadcast signal transmitter 400 amplifies a digital broadcast signal or a digital disaster broadcast signal, removes noise, and transmits the amplified broadcast signal. The broadcast signal transmitter 400 includes a high power amplifier (HPA) 410, a channel filter 420, and an output antenna 430.

The high-power amplifier 410 receives the digital broadcast signal or the digital disaster broadcast signal from the broadcast signal relay unit 200. The high-power amplifier 410 high-amplifies the digital broadcast signal or the digital disaster broadcast signal and transmits the amplified signal to the channel filter 420.

The channel filter 420 filters the digital broadcast signal or the digital disaster broadcast signal transmitted from the high-power amplifier 410 according to the transmission channel and transmits the filtered signal to the output antenna 430.

The output antenna 430 transmits the digital broadcast signal or the digital disaster broadcast signal transmitted from the channel filter 420.

3 is a diagram schematically showing a protocol stack and a layer-by-layer frame for a shaded area emergency alert service according to an embodiment of the present invention.

Referring to FIGS. 2 and 3, a digital disaster broadcast signal according to an embodiment of the present invention is generated based on the AEAS standard. In the AEAS standard, a disaster message layer 500a, a disaster message partition layer 500b, a fast information data channel (FIDC) layer 500c, a fast information channel (FIC) layer 500d, and a transmission frame multiplexer (TMF) layer 500e ). Here, the disaster message layer 500a and the disaster message partition layer 500b are newly defined. Further, in the AEAS standard, additional requirements are defined in the FIDC layer 500c, the FIC layer 500d, and the TMF layer 500e. In the embodiment of the present invention, a disaster alert service for a shadow area using the disaster message layer 500a, the disaster message partition layer 500b and the FIDC layer 500c corresponding to the upper layer in the AEAS standard will be described in detail.

The disaster message layer 500a corresponds to the highest layer and defines the contents (semantics) and syntax (syntax) of a disaster message in order to express a disaster message in a code and a character format.

The disaster message partition layer 500b defines a method for partitioning a disaster message. In the FIG 5/2 field, data of up to 26 bytes may be included in the FIG 5/2 field in providing a disaster warning service for a shadow area. However, since the size of a general disaster message is larger, the disaster message partition layer 500b Creates a message segment, and passes the message segment to the next layer.

Hereinafter, a method for changing the specification of the AEAS standard to provide a disaster warning service for a shadow area will be described in more detail with reference to FIG. 4 to FIG.

4 is a diagram schematically illustrating a configuration of a structure change disaster message according to an embodiment of the present invention. 5 is a diagram illustrating an example of generating a disaster message for a transliteration area by adding a message issuing organization for providing a disaster warning service for a shadow area in the structure change disaster message shown in FIG.

 2 and 4, the terminal activation unit 320 of the disaster broadcasting unit 300 according to the embodiment of the present invention changes the structure of the existing disaster message 600 generated according to the AEAS standard, In addition, a disaster message for the transliteration area is generated.

The terminal activation unit 320 generates the structure change disaster message 700 by changing the structure of the existing emergency message 600 generated according to the AEAS standard. That is, the terminal activation unit 320 transmits a 2-bit size of the 3 bits of the spare field 660 to the spare field 760a of the structure change disaster message 700 so as to be compatible with the existing disaster message 600, . Then, the terminal activation unit 320 sets the size of the remaining one bit of the 3 bits as the size of the DMB channel switching flag field 760b. Then, the terminal activation unit 320 determines whether to allocate the DMB channel switching field 760c according to the value of the DMB channel switching flag field 760b. In other words, if the value of the DMB channel switching flag field 760b is '0', the terminal activation unit 320 sets the DMB channel switching field 760c to 0 bit so that the DMB channel switching field 760c is not allocated, If the value of the DMB channel switching flag field 760b is " 1 ", the DMB channel switching field 760c is set to 16 bits so that the DMB channel switching field 760c is allocated. At this time, the DMB channel switching field 760c includes a spare field 761c, an ensemble channel designation field 762c, and a subchannel designation field 763c. Only the specification of the spare field 660 of the existing disaster message 600 is changed and the specifications of the remaining fields 610-650, 670 and 680 are maintained to be the same to generate the structure change disaster message 700. [ Here, the existing disaster message 600 includes a disaster type field 610, an alarm priority field 620, a disaster notification time field 630, a disaster area type field 640, a disaster area number field 650, (660), a disaster area field (670), and a short text field (680). Unlike the existing disaster message 600, the structure change disaster message 700 has the specification of the reserved field 760 changed, but the specifications of the other fields remain the same.

5, the terminal activation unit 320 divides the structure change disaster message 700 to activate the inactive terminal in a specific shadow area, such as a tunnel and an underground space, and transmits the message segment 800 And adds a message issuing authority to the segment header 810 of the message segment 800. At this time, the structure change disaster message 700 is transmitted to the disaster message partition layer 500b through the disaster message layer 500a. The structure change disaster message 700 is divided in the disaster message partition layer 500b to generate the message segment 800 and transmitted to the FIDC layer 500c. That is, the terminal activation unit 320 divides the structure change disaster message 700 to generate the message segment 800. Here, the message segment 800 includes a segment header 810 and message segment data 820. The segment header 810 includes a current segment number field 811, a total number of segments field 812, and a disaster message ID field 813. Here, the disaster message ID field 813 includes a message issuing authority field 8131 and a message unique ID field 8132. Then, the terminal activation unit 320 adds a message issuing organization to the message issuing authority field 8131 of the segment header 810. [ In other words, the terminal activation unit 320 adds a new field 8131a to the table (Table 1) generated by 3 bits of the message issuing authority field 8131 and displays a specific shade area management organization such as a tunnel and an underground space do.

FIG. 6 is a diagram schematically showing field-specific meanings of the structure change disaster message shown in FIG. FIG. 7 is a diagram schematically showing the configuration and field meanings of the DMB channel switching field shown in FIG.

4 and 6, in the embodiment of the present invention, the structure change disaster message 700 includes a disaster type field 710, an alarm priority field 720, a disaster announcement time field 730, (740), a reserve field (760), a disaster area field (770), and an abbreviation field (780). Specifically, the disaster type field 710 is 3 bytes in size, meaning " reset to fit the existing disaster type code, and add disaster type code if necessary ". The alarm priority field 720 has a size of 2 bits and means "set to 11 (very urgent, character information + alarm)" in case of a disaster broadcasting service for a shadow area. The disaster announcement time field 730 has a size of 28 bits and means " reset from the time of the execution of the emergency alert service for the shadow area ". The disaster area format field 740 is a size of 3 bits and means " set by adding the current area " 011 ". The number of disaster area field 750 is 4 bits in size, which means " disregarded when disaster warning service for a shade area for a tunnel is provided ". The spare field 760a is 2 bits in size and means to use 1 bit in the DMB channel switching flag field 760b. The DMB channel switching flag field 760b has a size of 1 bit and means " determine whether to switch to DMB broadcasting ". That is, when the value of the DMB channel switching flag field 760b is '0', it is not switched to the DMB broadcasting (the size of the DMB channel switching field 760c becomes 0 bit). When the value of the DMB channel switching flag field 760b is '1', the DMB broadcasting is switched to the DMB broadcasting (the size of the DMB channel switching field 760c is 16 bits). The DMB channel switching field 760c is variably set to 0 bit or 16 bits. When the size of the DMB channel switching field 760c is set to 0 bit, the DMB channel switching field 760c is a field that is not used. When the size of the DMB channel switching field 760c is set to 16 bits, the DMB channel switching field 760c includes a spare field 761c, an ensemble channel designation field 762c, and a subchannel designation field 763c, . Specifically, the spare field 761c is 4 bits in size and is allocated for byte alignment. The ensemble channel designation field 762c has a size of 6 bits and is used for channel switching for switching to a DMB broadcasting channel. At this time, the channel mapping depends on the channel setting for each country. In Korea, "0" is 7A, "1" is 7B, "2" is 7C, "3" is 8A, "5" is 8C, ... , "18" is set to 13A, "19" is set to 13B, "20" is set to 13C, and "21-63" The sub-channel designation field 763c is set to 6 bits, and is used for selecting a sub-channel for the selected ensemble, and uses the sub-channel numbers "0-63" of the DAB standard as is. Referring again to FIG. 6, the disaster area field 770 is of variable size and is not sent in the disaster recovery message 700. The short text field 780 is set to a variable size.

8 is a view illustrating an example of providing a disaster warning service for a shadow area using an existing disaster message without changing the standard of the AEAS standard according to another embodiment of the present invention.

Referring to FIGS. 4 and 8, the terminal activation unit 320 of the disaster broadcasting unit 300 according to another embodiment of the present invention maintains the disaster broadcasting data of the FIG 5/2 field of the existing disaster message 600 Disaster broadcast activation data is added to generate disaster message for transliteration area.

Specifically, the broadcasting signal receiving unit 100 receives the amplified terrestrial DMB signal. The terminal activation unit 320 detects an existing disaster message 600 from the amplified terrestrial DMB signal. The terminal activation unit 320 generates disaster broadcast activation data using the disaster broadcast encoded data transmitted from the disaster information encoding unit 310. [ The terminal activation unit 320 displays the disaster broadcast activation data using the additional information such as link information in the short message field 680 of the existing disaster message 600. [ If additional information is included in the existing disaster message 600 as in the embodiment of the present invention, the T-DMB receiver (not shown) parses the disaster broadcast-related ensemble and subchannel of the disaster broadcast activation data unconditionally, Video and audio corresponding to a broadcast signal (hereinafter referred to as " disaster broadcast video ") can be displayed.

For example, the broadcast signal multiplexing unit 330 multiplexes the terrestrial DMB locator format disaster broadcast activation data "dab.service: //F1E044.F1F1E00441" 681, which is used in the T-DMB MATE standard of FIG. 8, Field 680 and delivers it. Then, the T-DMB receiver (not shown) parses the corresponding sub-channel 681 to display the disaster broadcast moving picture. In the embodiment of the present invention, the sub channel 681 is divided into symbols (" "), but the present invention is not limited thereto and can be distinguished by using other symbols ({}, [], * *,%% have.

For example, when the ensemble of the emergency alert service for the shadow area is "12A" and the subchannel is "3", the broadcast signal multiplexer 330 displays "12A03" at the end of the content of the short message field 680 . In this case, not only the symbols ("") but also other symbols ({}, [], * *,%%, etc.) can be displayed at this time as well as the display method "12A-03"&Quot; and the like. It is also possible to set various display formats such as " 205.280,03 "," 205008,03 "," 205.280 / 03 ", and " 205008/03 " in which frequency information is displayed in the ensemble 12A.

9 is a view showing another example of providing a disaster warning service for a shadow area using an existing disaster message without changing the standard of the AEAS standard according to the embodiment of the present invention.

Referring to FIGS. 4 and 9, the terminal activation unit 320 of the disaster broadcasting unit 300 according to another embodiment of the present invention activates the disaster broadcast data in place of the disaster broadcast data displayed in the FIG 5/2 field of the existing disaster message 600 Data is newly displayed to generate a disaster message for the transliteration region.

Specifically, the terminal activation unit 320 receives the terrestrial DMB signal amplified from the broadcast signal receiving unit 100. The terminal activation unit 320 detects an existing disaster message 600 from the amplified terrestrial DMB signal. The terminal activation unit 320 generates the FIG message 900 using the existing disaster message 600 and newly displays the disaster broadcast activation data in the FIG 5/2 field of the FIG message 900. That is, the terminal activation unit 320 divides the existing disaster message 600 to generate the message segment 600a. The terminal activation unit 320 generates the FIG message 900 including the message segment 600a using the protocol of the FIDC layer 500c. Here, the FIG message 900 includes the FIG header 910 and the FIG data 920. The FIG data 920 includes a D1 field 921, a D2 field 922, an FIDCId field 923, and a FIG 5/2 field 924. The terminal activation unit 320 transmits the FIG message 900 to the broadcast signal multiplexing unit 330. At this time, since the D1 field 921 is not used because the field value is set to "0" in the AEAS standard specification, the broadcast signal multiplexing unit 330 uses the D1 field 921 of the FIG message 900 Disaster broadcast activation data is displayed. In other words, if the value of the D1 field 921 is " 0 ", the broadcast signal multiplexing unit 330 displays the disaster broadcast data 924a according to the AEAS standard in the FIG 5/2 field 924, And displays the disaster broadcast activation data 924b in the FIG 5/2 field 924 so that a disaster warning service for the shade area can be provided if the value of the field 921 is "1". For example, when the value of the D1 field 921 is "1", the broadcasting signal multiplexing unit 330 multiplexes the contents of the FIG 5/2 field 924 into "dab.service: // F1E044.F1F1E00441" or "12A03" And transmits them. In the embodiment of the present invention, the disaster broadcast activation data is newly displayed according to the value of the D1 field 921 in order to newly display the disaster broadcast activation data instead of the disaster broadcast data displayed in the FIG 5/2 field of the existing disaster message 600 The present invention is not limited to this, and it is also possible to display the disaster broadcast activation data after deleting the disaster broadcast data according to the standard of the AEAS standard, regardless of the value of the D1 field 921. [

As described above, according to the embodiment of the present invention, it is possible to transmit an existing disaster message for a general disaster situation without changing the standard of the AEAS standard as shown in FIGS. 8 and 9, T-DMB and DAB.

10 is a flowchart illustrating a method for providing a disaster alert service for a shadow area according to an embodiment of the present invention.

10, a broadcast signal receiving unit 100 of a digital broadcast signal providing apparatus 10 according to an embodiment of the present invention receives and amplifies a terrestrial DMB signal and outputs the amplified signal to a broadcast signal relay unit 200 And the disaster broadcasting unit 300 (S100).

 The broadcast signal relay unit 200 generates a digital broadcast signal using the amplified terrestrial DMB signal in the event of a disaster, and transmits the digital broadcast signal (S110). In case of a disaster, the disaster broadcasting unit 300 detects an existing disaster message using the amplified terrestrial DMB signal (S120). The disaster broadcasting unit 300 generates disaster broadcast encoded data using the disaster broadcast source data, and generates disaster broadcast activation data using the disaster broadcast encoded data. Then, the disaster broadcasting unit 300 determines whether the disaster broadcasting data is included in the FIG 5/2 field corresponding to the FIDC in the FIC of the existing disaster message (S130).

If it is determined in step S130 that the disaster broadcasting data is not included in the FIG 5/2 field of the existing disaster message, the disaster broadcasting unit 300 determines that the disaster message having the changed structure of the existing disaster message (S140a). Then, the terminal activation unit 320 adds the disaster broadcast activation data to the FIG 5/2 field of the structure change disaster message in order to provide the disaster alert service for the shadow area (S 140 b). Then, the terminal activation unit 320 adds a message issuing organization to the header of the message segment of the structure change disaster message to generate a disaster message for the transliteration region (S140c).

On the other hand, if it is determined in step S130 that the disaster broadcasting data is included in the FIG 5/2 field of the existing disaster message, the disaster broadcasting unit 300 displays the newly generated disaster broadcasting activation data instead of the disaster broadcasting data displayed in the existing disaster message (S150a). Alternatively, the disaster broadcasting data may be added while maintaining the disaster broadcasting data displayed in the existing disaster message to display the disaster message for the transliteration area (S150b) to generate the disaster message for the transliteration area.

The disaster broadcasting unit (300) multiplexes the disaster message for the transliteration area. The disaster broadcast unit 300 transmits the generated disaster broadcast multiplex signal to the broadcast signal relay unit 200 (S160). Then, the broadcast signal relay unit 200 converts the disaster broadcast multiplex signal into a digital disaster broadcast signal. In operation S170, the broadcast signal relay unit 200 transmits the digital disaster broadcast signal through the broadcast signal transmitter 400 so that the disaster alert service can be provided not only in text but also in a multimedia such as a disaster broadcast moving picture in a shaded area.

If a disaster warning service for a shaded area according to an embodiment of the present invention is provided, the T-DMB receiver, which is in a deactivated state in a specific shadow area such as a tunnel and an underground space, Related ensembles and subchannels can be parsed to automatically display disaster broadcast video such as video and audio corresponding to a digital disaster broadcast signal to prepare for a disaster situation.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And various modifications may be made by those skilled in the art without departing from the scope of the present invention.

10: Digital broadcast signal providing device
100: Broadcast signal receiver
200: Broadcast signal relay unit
300: Disaster Broadcasting Department
400: Broadcast signal transmitter

Claims (19)

Generating a second disaster message signal including a disaster broadcast activation data for a disaster alert service for a shadow area based on the value of the first field of the first disaster message signal from the terrestrial DMB signal Disaster Relief Department; And
And a broadcast signal relay unit for controlling transmission of the second disaster message signal transmitted from the disaster broadcast unit,
The disaster-
And a terminal activation unit for modifying the structure of the first disaster message signal and generating the second disaster message signal according to a result of determining whether the disaster broadcast data is included in the first field,
The terminal activation unit,
If the disaster broadcasting data is not included in the first field, a structure of the first disaster message signal is changed, and then a message issuing agency for the shaded area for the disaster broadcasting activation data and the shaded area emergency alert service is added And generates the second disaster message signal. The method according to claim 1,
Wherein the first field is a FIG 5 Extension 2 field which is a fast information data channel (FIDC) in a fast information channel (FIC) of the first disaster message signal. delete delete The method according to claim 1,
The terminal activation unit,
Generating a structure change disaster message signal by changing a structure of a second field not used in the first disaster message signal, displaying the disaster broadcast activation data in a first field of the structure change disaster message signal, And the message issuing authority is displayed in a message segment of the disaster message signal. 6. The method of claim 5,
The terminal activation unit,
Generates the message segment by dividing the structure change disaster message signal, and adds a message dispatcher for the disaster alert service for the shade area to a header table of the message segment. 3. The method of claim 2,
The terminal activation unit,
Wherein when the disaster broadcasting data is included in the first field, the disaster broadcasting activation data is displayed instead of the disaster broadcasting data included in the first field, or the disaster broadcasting data included in the first field is maintained, And generates the second disaster message signal by adding the broadcast activation data. 8. The method of claim 7,
The terminal activation unit,
And generating a FIG message signal including the message segment based on the first disaster message signal and a value of a second field not used in the FIG message signal to replace the disaster broadcast data included in the first field, The digital broadcast signal providing apparatus comprising: 8. The method of claim 7,
The terminal activation unit,
And adds the disaster broadcast activation data to a second field for displaying a short message while maintaining the disaster broadcast data included in the first field of the first disaster message signal. The method according to claim 1,
Wherein the broadcast signal relay unit comprises:
And an intermediate frequency selector for receiving the modulated signal of the terrestrial DMB signal through the first input terminal and receiving the modulated signal by multiplexing the second disaster message signal through the second input terminal, Wherein the digital broadcast signal providing apparatus comprises: Detecting a first disaster message signal from the terrestrial DMB signal;
Generating disaster broadcast activation data for providing a disaster alert service for a shadow area;
Generating a second disaster message signal including the disaster broadcast activation data based on a value of a first field of the first disaster message signal; And
And delivering the second emergency message signal to be controlled,
Wherein the generating the second disaster message signal comprises:
Determining whether disaster broadcast data is included in the first field;
Generating a second disaster message signal by changing a structure of the first disaster message signal when the first field does not include the disaster broadcast data; And
And generating the second disaster message signal without changing the structure of the first disaster message signal when the first field includes the disaster broadcast data. 12. The method of claim 11,
Wherein the first field is a FIG 5 Extension 2 field which is a Fast Information Data Channel (FIDC) in a Fast Information Channel (FIC) of the first disaster message signal. delete 12. The method of claim 11,
Generating a structure change disaster message signal by changing a structure of a second field not used in the first disaster message signal when the first field does not include the disaster broadcast data;
Displaying the disaster broadcast activation data in a first field of the structure change disaster message signal; And
And displaying a message issuing organization for the shaded area emergency alert service in a message segment of the reshaping message. 15. The method of claim 14,
Wherein the step of displaying the message issuing authority comprises:
Dividing the structure change disaster message signal to generate the message segment; And
Further comprising adding the message issuing authority to a table of a header of the message segment. 13. The method of claim 12,
And generating the second disaster message signal by displaying the disaster broadcasting activation data instead of the disaster broadcasting data included in the first field when the first field includes the disaster broadcasting data. A method of providing a broadcast signal. 17. The method of claim 16,
Wherein the displaying of the disaster broadcast activation data comprises:
Generating a FIG message signal including a message segment of the first disaster message signal; And
And displaying the disaster broadcast activation data instead of the disaster broadcast data included in the first field according to a value of a second field not used in the FIG message signal. 12. The method of claim 11,
And generating the second disaster message signal by adding the disaster broadcast activation data while maintaining the disaster broadcast data included in the first field when the first field includes the disaster broadcast data Wherein the digital broadcast signal is a digital broadcast signal. 19. The method of claim 18,
Wherein the adding of the disaster broadcast activation data comprises:
And adding the disaster broadcast activation data to a second field indicating a short message while maintaining the disaster broadcast data included in the first field of the first disaster message signal. Way.

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