KR101420188B1 - Method for providing emergency alert broadcasting, apparatus of relaying broadcasting multiplexer and multiplexing method - Google Patents

Abstract

The present invention relates to a method for providing a disaster broadcast, a broadcast relay apparatus, a multiplexer, and a multiplexing method, and a method for providing a disaster broadcast according to one aspect includes providing a disaster broadcast according to a standard of each broadcast channel when a disaster occurs, The method of claim 1, wherein the providing of the disaster broadcast comprises: first multiplexing an audio stream of a first sampling frequency and a source stream of a disaster broadcast; mixing an audio stream of a second sampling frequency different from the first sampling frequency, 2. The method of claim 1, further comprising: generating a first disaster broadcast service stream having a first service bit rate of a first broadcast channel by selectively inserting a null stream into a first multiplexed stream; The second service bit rate of the second broadcast channel different from the first service bit rate, And a step of generating a stream.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for providing a disaster broadcast, a broadcast relay apparatus, a multiplexer, and a multiplexing method,

The present invention relates to a broadcast relay apparatus, a multiplexer, and a multiplexing method, and more particularly, to a method, a broadcast relay apparatus, a multiplexer, and a multiplexing method for providing a disaster broadcast to a broadcast relay apparatus.

Terrestrial digital multimedia broadcasting (DMB) has been commercialized with the addition of a multimedia broadcasting service including a video service to the Eureka 147 based DAB (Digital Audio Broadcasting) system of Europe.

Recently, there has been a discussion about installing a terrestrial DMB repeater in a shaded area such as a mountain or a dense building in order to improve the quality of a broadcasting signal after the terrestrial digital multimedia broadcasting service is commercialized. This is to improve the reception state of the terrestrial digital multimedia broadcasting by installing a terrestrial digital multimedia broadcasting repeater in a region where the broadcast reception ratio is low, such as in a shaded area. In order to increase the broadcasting reception rate, such a digital multimedia broadcasting repeater needs to be installed not only in a shadow area but also in an area such as a tunnel or a subway.

The conventional terrestrial digital multimedia broadcasting repeater focuses on relaying broadcast signals of various channels. Such broadcasting apparatuses do not have a function to cope with emergency situations. However, the broadcast relay apparatus performs the relay function of the broadcast signal for the specific area.

On the other hand, in the conventional digital multimedia broadcasting, the same broadcasting service is provided not only to a specific area but also to various areas. Also, only urgent broadcast or disaster broadcast services for the entire area can be provided, rather than a specific area. It is difficult to provide a disaster broadcasting service only in a corresponding area using digital multimedia broadcasting when an emergency occurs in a specific area.

In addition, when a disaster-related signal is to be served using the above-described broadcast relay apparatus, a disaster-related signal occurring in a specific area must be encoded into signals of various channels transmitted and received by the broadcast relay apparatus. Must be installed separately. In such a case, the configuration of the broadcast relay apparatus becomes complicated. For example, when a disaster situation occurs and there is a need to broadcast a disaster, if the audio sampling frequency of the video and visual radio service of the existing broadcast and the video and visual radio service of the existing broadcast received until just before are not the same, A problem may occur that the terminal malfunctions.

It is an object of the present invention to provide a method and a device for providing a disaster broadcasting service capable of transmitting a disaster broadcasting service signal of a specific area to a plurality of receiving terminals according to a plurality of audio sampling frequencies of a video and visual radio service.

It is another object of the present invention to provide a multiplexing method and a multiplexer capable of transmitting a disaster broadcasting service signal of a specific area to a plurality of receiving terminals according to a plurality of audio sampling frequencies of a video and visual radio service.

According to an aspect of the present invention, there is provided a method of providing a disaster broadcasting service, the method including relaying a regular broadcast of a plurality of broadcast channels, and providing a disaster broadcast according to a standard of each broadcast channel when a disaster occurs Wherein the providing of the disaster broadcast comprises: first multiplexing an audio stream at a first sampling frequency and a source stream for a disaster broadcast; and an audio stream at a second sampling frequency different from the first sampling frequency, Generating a first disaster broadcast service stream having a first service bit rate of a first broadcast channel by selectively inserting a null stream into the first multiplexed stream, And a null stream is selectively inserted into the multiplexed stream so that a second stream of a second broadcast channel different from the first service bit rate And generating a second disaster broadcast service stream having a service bit rate.

According to another aspect of the present invention, there is provided a broadcast relay apparatus for multiplexing an audio stream of a first sampling frequency and a source stream for a disaster broadcast, A disaster message generator for multiplexing the stream and the source stream to generate first and second service streams; and a null stream generator for selectively inserting a null stream into the first service stream to generate a first broadcast channel of a first service bit rate And multiplexes the null stream in the second service stream into a second broadcast channel standard having a second service bit rate different from the first service bit rate, Wherein the audio streams and the source stream are transmitted to the first The second service is a pre-coded in the bit rate of the minimum service bit rate of the bit rate or less.

According to another aspect of the present invention, there is provided a multiplexer of a broadcast relay apparatus for relaying a plurality of regular broadcast streams including audio streams having different sampling frequencies, An FIC analysis unit for receiving the regular broadcast stream and extracting Fast Information Channels (FICs) from the regular broadcast stream; and a control unit for analyzing the received regular broadcast stream, A frame analyzing unit for selecting and receiving one service stream corresponding to the extracted sampling frequency information among the service streams of different sampling frequencies generated and provided for the disaster broadcasting, And a service processor A control unit for providing null stream insertion information according to the spare bit rate when the spare bit rate is determined from the fast information channel; A null stream inserting unit for selectively inserting a null stream into the service stream and an ensemble multiplexing unit for multiplexing a part of frames of the received regular broadcast stream into a service stream into which the null stream is inserted, Is equal to or less than a minimum service bit rate among the service bit rates of the plurality of regular broadcast streams.

According to another aspect of the present invention, there is provided a multiplexing method of a plurality of regular broadcast streams including audio streams having different sampling frequencies,

The method comprising the steps of: receiving one of the plurality of regular broadcast streams; analyzing the received regular broadcast stream to extract identification information and sampling frequency information of the audio stream in the received regular broadcast stream; The method comprising: generating service streams corresponding to the different sampling frequencies for a disaster broadcast; selecting one service stream matching the extracted sampling frequency information from the generated service streams; Modifying the identification information into the extracted identification information, selectively inserting a null stream into the selected service stream, and replacing part of frames of the received regular broadcast stream with a service stream into which the null stream is inserted As shown in FIG.

According to the present invention, it is possible to encode a disaster situation in a specific area at a predetermined bit rate using a single encoder in a broadcast relay apparatus, selectively insert null streams in accordance with service bit rates of various channels of a digital multimedia broadcasting, Disaster messages can be provided on various channels. Therefore, the broadcast relay apparatus does not need to have an encoder for each broadcast channel, so that the configuration of the apparatus can be simplified.

In addition, by multiplexing the disaster content into which the null streams are inserted into various broadcast standards, it is possible to simultaneously provide various disaster broadcasts of the local area to various viewers of a specific area watching different broadcast channels.

In addition, by supporting both the audio sampling frequencies in the video and visual radio services currently used in broadcasting companies, it is possible to transmit disaster alarm broadcasting contents to the current receiving broadcast channel of the receiving terminal of the viewer in the event of a disaster in a tunnel, It is possible to quickly and accurately transmit the disaster situation to the local viewer without any separate operation on the receiving terminal of the viewer.

1 is a block diagram illustrating a broadcast relay apparatus capable of relaying a disaster broadcast according to an embodiment of the present invention.
2 is a block diagram illustrating a disaster message generating unit that can be used in a broadcast relay apparatus according to an exemplary embodiment of the present invention.
3 is a block diagram illustrating a disaster broadcast multiplexer according to an embodiment of the present invention.
4 is a block diagram illustrating a disaster message generating unit that can be employed in a broadcast relay apparatus according to another embodiment of the present invention.
5 is a block diagram illustrating a disaster message generating unit that can be employed in a broadcast relay apparatus according to another embodiment of the present invention.
6 is a block diagram illustrating a disaster message generating unit that can be employed in a broadcast relay apparatus according to another embodiment of the present invention.
FIG. 7 is a schematic block diagram of an MPEG-4 on MPEG-2 TS multiplexing unit employable in the disaster message generating unit of FIGS. 5 and 6. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings and the following description. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is to be understood that the terms " comprise "and / or" comprising "when used in the specification are intended to indicate that the components, steps, operations, and / And does not exclude the presence or addition thereof.

A broadcast relay apparatus and a method for providing a disaster broadcast according to embodiments of the present invention will be described with reference to FIG. 1 is a block diagram illustrating a broadcast relay apparatus capable of relaying a disaster broadcast according to an embodiment of the present invention.

Referring to FIG. 1, the broadcast relay apparatus 10 capable of relaying disaster broadcasts basically functions to relay signals of various channel broadcasts, and in case of a disaster situation, provides a disaster broadcast to terminals in various channels . The broadcast relay apparatus 10 may be installed in a shadow area such as a building densely populated area, a mountain, a tunnel, or a subway to improve the quality of broadcast signals. The broadcast relay apparatus 10 normally broadcasts regular broadcasts on various channels, and in case of a disaster, provides a disaster broadcast in the same format and standard stream as regular broadcasts of various channels, It may not perform any other processing for receiving.

The broadcast relay apparatus 10 includes a plurality of relay units 12, 14 and 16, a disaster message generating unit 100, a plurality of disaster broadcast multiplexing units 300_1, 300_2 and 300_3, 400_1, 400_2, and 400_3, a switching unit 500, and an RF transmitter 600. [ Here, the number of each of the plurality of relay units 12, 14, 16, the plurality of disaster broadcast multiplexing units 300_1, 300_2, 300_3, and the plurality of modulation units 400_1, 400_2, 400_3 corresponds to the number of broadcast channels .

The plurality of repeaters 12, 14, and 16 relay the regular broadcast streams of the broadcast channels. Here, the regular broadcast streams relayed by each of the plurality of relay units 12, 14, and 16 can have respective service bit rates. Each of the relay units 12, 14 and 16 may relay the T-DMB (Terrestrial-DMB) signal or the S-DMB (Satellite-DMB) signal to the switching unit 500.

The disaster message generating unit 100 receives an audio source, a video source, an external input, and a data source and generates and outputs a service stream for a disaster broadcast. Here, the audio source, the video source, the external input, and the data source are signals for disaster broadcasting, and the external input may be Binary Format for Scenes (BIFS) data for disaster broadcasting. The audio source may comprise, for example, a bit-sliced arithmetic coding (BASC) audio signal at different first and second sampling frequencies. For example, the first sampling frequency may be 44.1 kHz and the second sampling frequency may be 48 kHz. In this case, the disaster message generation unit 100 can support both the audio signals of the first and second sampling frequencies. For example, the disaster message generation unit 100 may multiplex the audio stream and the source stream at the first sampling frequency and multiplex the audio stream and the source stream at the second sampling frequency. Where the source stream may mean that at least one of an audio source, a video source, a video source for visual radio, or a data source has been encoded. The service stream output by the disaster message generation unit 100 may be a stream for a disaster broadcast, in which a video stream, an audio stream, a visual radio service stream, and a BIFS stream are multiplexed.

Each of the plurality of disaster broadcast multiplexers 300_1, 300_2, and 300_3 analyzes the service information of the regular broadcast stream input through the antenna, multiplexes the service stream for the disaster broadcast according to the standard of the broadcast channel, and outputs the multiplexed service stream. For example, the plurality of disaster broadcast multiplexers 300_1, 300_2, and 300_3 receives the service stream output from the disaster message generator 100 and generates a disaster broadcast service stream having a service bit rate corresponding to each of the various broadcast channels. The plurality of disaster broadcast multiplexers 300_1, 300_2, and 300_3 may provide the service bit rate information of the broadcast channel to the disaster message generator 100, respectively. The disaster message generation unit 100 may generate the disaster message stream using the service bit rate information.

Specifically, the plurality of disaster broadcast multiplexers 300_1, 300_2, and 300_3 may output a disaster broadcast service stream having a service bit rate by selectively inserting a null stream into a service stream for a disaster broadcast. For this, the disaster message generation unit 100 may output a disaster message stream encoded at a bit rate less than the minimum bit rate among various service bit rates.

Meanwhile, the plurality of modulators 400_1, 400_2, and 400_3 may modulate each of the disaster broadcast service streams, for example, COFDM (Coded Orthogonal Frequency Division Multiplexing).

The switching unit 500 provides regular broadcast signals normally received through the RF transmitter 600 to the user's terminal. When a disaster broadcast service stream is input, the switch 500 stops receiving regular broadcast signals and outputs a disaster broadcast service stream And provides it to the terminal through the RF transmitter 600. That is, the switching unit 500 may switch the regular broadcast stream and the disaster broadcast service stream and output the disrupted broadcast service stream under the control of the system control unit 520 when a disaster occurs. The RF transmitter 600 receives one of a regular broadcast stream and a disaster broadcast service stream for each channel as a channel signal of an intermediate frequency (IF) band, for example, a system bandwidth of 1.536 MHz, and generates a terrestrial DMB channel having a bandwidth of 6 MHz .

In the embodiment of FIG. 1 and in the following embodiments, there are three broadcast channels, and an audio source, a video source, an external input and a data source are input for a disaster broadcast and an external input includes BIFS data However, the broadcast relay apparatus according to the present embodiment can provide regular broadcast signals and disaster broadcast service streams to the channels, and can not only provide a DMB service but also a digital audio broadcasting service or a digital video (Digital Audio Broadcasting) service.

Hereinafter, a broadcast relay apparatus according to embodiments of the present invention will be described in detail with reference to FIG. 2 to FIG.

First, a broadcast relay apparatus according to embodiments of the present invention will be described with reference to FIGS. 2 and 3. FIG. FIG. 2 is a block diagram illustrating a disaster message generating unit employable in a broadcast relay apparatus according to an exemplary embodiment of the present invention. FIG. 3 is a block diagram illustrating a disaster broadcast scheduler employed in a broadcast relay apparatus according to an embodiment of the present invention.

Referring to FIG. 2, the disaster message generator 100a includes a bit rate controller 110, a video service encoder 120a, an audio service encoder 160, a data service encoder 170, an ETI frame generator 180, And an ETI signal distributor 190.

The video service encoder 120a includes a BIFS encoding unit 122, an Advanced Video Coding (AVC) video encoding unit 124, a first BSAC (Bit-sliced Arithmetic Coding) audio encoding unit 126, a second BSAC audio encoding unit The first to fourth MPEG-2 TS multiplexers 140, 142, 144 and 146, and the first to fourth TS remultiplexers 150, 150, 152, 154, 156).

The disaster message generator 100a according to the present embodiment supports various audio sampling frequencies. For example, the first and second BSAC audio encoding units 126 and 128 support the two sampling frequencies 44.1 kHz and 48 kHz, respectively, so that the disaster message generating unit 100a generates a disaster message corresponding to 44.1 kHz and 48 kHz Thereby generating the first and second video service streams and the first and second visual radio service streams. That is, the first and second audio streams (hereinafter, referred to as 'first and second audio ES') of an ES (Elementary Stream) respectively output from the BSAC audio encoding units 126 and 128 are transmitted to one AVC video encoding unit 4 on MPEG-2 process together with a video stream (hereinafter referred to as " video ES ") output from the first and second video service streams 124 and 124 and output as first and second video service streams. Here, the first and second video service streams may be TS (Transport Stream) and ES packet generated by packetizing into MPEG-2. The first and second audio ESs output from the BSAC audio encoding units 126 and 128 are respectively output to a video stream for visual radio (hereinafter, referred to as 'video ES' for visual radio) output from one content reproduction unit for a visual radio 130a, (MPEG-4 on MPEG-2), and output as first and second visual radio service streams, respectively.

The first and second visual service streams and the first and second visual radio service streams are composed of an ETI frame by an ETI (Ensemble Transport Interface) frame generator 180, and each of the disaster multiplexers 300_1, 300_2, 300_3).

The function of each component of the disaster message generator 100a according to the present embodiment will be described in more detail.

The bit rate control unit 110 receives the service bit rates of the first to third broadcast channels (or ensembles) currently broadcasted from the respective FIC analysis units (see 320 in FIG. 3) of the disaster multiplexers 300_1, 300_2 and 300_3 And determine a predetermined bit rate less than or equal to the minimum bit rate among the service bit rates as the preliminary bit rate. For example, the bit rate determination unit 110 may determine the minimum bit rate among the service bit rates to be a preliminary bit rate.

For example, the ensemble configuration of the first broadcast channel has a first audio service bit rate of 128 Kbps, a first video service bit rate of 544 Kbps, and a first data service bit rate of 96 Kbps, The ensemble configuration of the broadcast channel has a second audio service bit rate of 96 Kbps, a second video service bit rate of 512 Kbps, and a second data service bit rate of 128 Kbps, and an ensemble configuration of the third broadcast channel has a third audio service A bit rate, a third video service bit rate of 544 Kbps, and a third data service bit rate of 64 Kbps. Here, the bit rate control unit 110 may determine 96 kbps as the reserved bit rate for the audio service. In addition, the bit rate control unit 110 can determine 64 Kbps for the data service as a reserve bit rate. In addition, the bit rate control unit 110 may determine 512 Kbps for the video service at a preliminary bit rate. However, in the case of video service coding, the bit rate that is obtained by subtracting the bit rate increased due to the externalization may be determined as the preliminary bit rate, taking into consideration the bit rate increased after externalization.

The bit rate determination unit 110 transmits the determined preliminary bit rate to the BIFS encoding unit 122, the AVC video encoding unit 124, the first BSAC audio encoding unit 126, the second BSAC audio encoding unit 124, Encoding unit 128, a visual radio playback unit 130a, an audio service encoder 160, and a data service encoder 170. [

The BIFS encoding unit 122 encodes and schedules a Binary Format For Scene (BIFS) data source input from the outside and outputs the encoded data to the first to fourth TS remultiplexers 150, 152, 154, and 156 in TS format.

The AVC video encoding unit 124 receives the video source, encodes it according to the H.264 / AVC standard, and outputs the video ES. At this time, the AVC video encoding unit 124 encodes the video source according to the preliminary bit rate provided from the bit rate control unit 110. In order to support the first and second sampling frequencies (for example, 44.1 kHz and 48 kHz), the AVC video encoding unit 124 multiplexes the video ES to the first and second MPEG-2 TS multiplexers 140 and 142 Respectively.

The first and second BSAC audio encoders 126 and 128 receive the audio sources respectively and encode the first and second audio ESs according to ISO / IEC 14496-3 BSAC standard, respectively, for two sampling frequencies, Can be output. The first and second BSAC audio encoding units 126 and 128 encode the audio source according to the preliminary bit rate provided from the bit rate control unit 110. The audio ES output from the first BSAC audio encoder 126 is transmitted to the first and third MPEG-4 MPEG multiplexers 140 and 144, respectively. The audio ES output from the second BSAC audio encoding unit 128 is transmitted to the second and fourth MPEG-4 MPEG multiplexers 142 and 146, respectively.

The visual radio content reproducing unit 130a outputs the disaster content stored for the visual radio according to the preliminary bit rate provided from the bit rate control unit 110. [ The output disaster content stream for visual radio (hereinafter, referred to as 'video ES for visual radio') is transmitted to the third and fourth MPEG-2 TS multiplexers 144 and 146, respectively.

Each of the first to fourth MPEG-4 MPEG-2 TS multiplexers 140, 142, 144, and 146 has two inputs, and outputs a video ES and a video signal in accordance with the first and second sampling frequencies of the audio source. Radio ES is input.

2, in the case of the video service, the two video ESs output from the AVC video encoding unit 124 are respectively mapped to the first audio ES (44.1 KHz) and the second audio ES (48 KHz) 4 on MPEG-2 TS multiplexing process. In the case of the visual radio, the two visual radio video ESs output from the visual radio reproducing unit 130a are respectively mapped to the first audio ES (44.1 KHz) and the second audio ES (48 KHz) 2 TS multiplexing process. At this time, the TSs output from the first through fourth MPEG-2 TS multiplexers 140, 142, 144, and 146 may be output in the form of 188-byte TS that has not been externally encoded. The externalization includes Reed-Solomon (RS) encoding and convolutional interleaver.

The first to fourth TS remultiplexers 150, 152, 154, and 156 may re-multiplex the video ES for the BIFS stream and the video ES for the visual radio that have been multiplexed with the MPEG-4 on MPEG-2 TS . That is, the first to fourth TS remultiplexers 150, 152, 154, and 156 multiplex and output the video and visual radio services so as to enable the BIFS service for disaster broadcasting.

The audio service encoder 160 receives an audio source and receives a bit rate control signal for a scheme such as MUSICAM (Masking pattern adapted Universal Sub-band Integrated Coding and Multiplexing) or HE-AAC V2 (High Efficiency Advanced Audio Coding Version 2) And outputs the stream by encoding the audio source according to the preliminary bit rate provided from the audio decoder 110.

The data service encoder 170 encodes the data source according to the input data source. Here, the data service refers to services such as TPEG (Transport Protocol Expert Group), BWS (Broadcast Web Site), and the like. The data service encoder 170 encodes the data source according to the preliminary bit rate provided from the bit rate control unit 110 and outputs the stream.

The ETI frame generation unit 180 generates first and second video service streams and first and second visual radio service streams output from the video service encoder 120a and audio service encoder 160 and data service Receives an audio service stream and a data service stream respectively output from the encoder 170, generates an ETI frame for these streams, and then performs ensemble multiplexing, and outputs the generated ETI frame in the form of an ETI stream through a hardware interface.

The ETI signal distributor 190 distributes the ETI stream input from the ETI frame generator 180 to the first through third disaster multiplexers 300_1, 300_2 and 300_3.

In this embodiment, the disaster message generating unit 100a outputs an ETI stream to each of the disaster multiplexer 300_1, 300_2, and 300_3 through an interface called ETI, but the present invention is not limited to this, and other types of interfaces can be used . For example, other types of interfaces may be used such as ASI (Asynchronous Serial Interface) and IP (Internet Protocol) tunneling.

The disaster broadcast multiplexing unit 300_1 will be described with reference to FIG. The first to third D / A multiplexers 300_1, 300_2, and 300_3 perform substantially the same functions, and thus the first D / A multiplexer 300_1 will be described below.

3, the emergency broadcast multiplexer 300_1 includes an RF receiver 310, an FIC analyzer 320, a subchannel analyzer 330, an ETI frame generator 340, an outer decoding A service stream analyzing unit 360, a rate control unit 370, an ETI frame analyzing unit 380, an identification information modifying unit 390, a null stream inserting unit 400, a time information correcting unit 410, An external scaler 420, an ensemble multiplexer 430, and an ETI output unit 440.

Hereinafter, the operation of each component will be described separately in the case where the disaster broadcast multiplexing unit 300_1 relays the regular broadcast and the disaster broadcast is provided. However, this is for the purpose of helping understanding of the explanation, and it does not operate separately when each constituent element relays a regular broadcast and when a disaster broadcast is provided.

First, the operation of each component will be described when the emergency broadcast multiplexing unit 300_1 relays regular broadcasts.

After receiving the regular broadcast signal from the antenna, the RF receiving unit 310 outputs Fast Information Channel (FIC) information to the FIC analyzing unit 320 and transmits each Main Channel Channel (MSC) (330). At this time, the RF receiving unit 310 receives the selected channel (ensemble) according to the control signal input from the rate control unit 370. The RF receiver 310 also transmits the ensemble stream of the regular broadcast to the subchannel analyzer 330. Here, the ensemble stream of the regular broadcast may include a regular video service stream, a regular visual radio service stream, a regular audio service stream, and a regular data service stream.

The FIC analyzing unit 320 analyzes the FIC signal received from the RF receiver 310 and provides information on each service information about the currently broadcasted ensemble, that is, information on each subchannel and bit rate information about each service to the rate control unit 370, . Then, the FIC analyzing unit 320 outputs all analyzed FIC information to the ETI frame generating unit 340.

The sub-channel analyzing unit 330 analyzes a sub-channel for the ensemble stream received from the RF receiving unit 310. The subchannel analyzer 330 passes the data of the subchannel to the ETI frame generator 340 according to the control signal received from the rate controller 370 and transmits the subchannel of the selected video and visual radio service stream to the outer decoder 350). The outer decoding unit 350 refers to the outer decoding and video stream decoding unit.

The ETI frame generator 340 constructs an ETI frame using the analyzed FIC information received from the FIC analyzer 320 and outputs the constructed ETI frame to the ensemble multiplexer 430. The ensemble multiplexing unit 430 may output the subchannel received from the subchannel analyzer 330 according to the determination of the rate control unit 370 by filling the allocated location in the MST (Main Stream data).

The outer decoding unit 350 decodes the input normal video and visual radio service streams and outputs them to the service stream analysis unit 360. Here, the outer decoding includes a convolutional deinterleaver and a Reed-Solomon (RS) decoding.

The service stream analyzing unit 360 analyzes the normal video and visual radio service streams inputted through the RF receiving unit 310 and parses the sampling frequency information for the identification information and the BSAC audio as the analysis result and transmits the parsed sampling frequency information to the rate control unit 370 send. Here, the identification information includes information related to a video signal, such as PAT PID (Program Association Table Packet IDentifier), PMT PID (Program Map Table Packet IDentifier), PCR PID (Program Clock Reference Packet IDentifier) Various PID information at the MPEG-2 level such as PID and various ES ID related information corresponding to the MPEG-4 level. Further, in the case of the BSAC sampling frequency, the "DecoderSpecificInfo data" field of "DecoderSpecificInfo" in the OD can be parsed and confirmed.

The transmission rate control unit 370 selects (or determines) an ensemble to be received and transmits the selected ensemble to the RF receiving unit 310. The transmission rate control unit 370 grasps the service information of the selected ensemble through the analysis result of the FIC analyzing unit 320. Here, the service information includes information on sub-channels and bit rate information for each service.

In addition, the rate control unit 370 allows the sub-channel analyzing unit 330 to analyze sub-channels for video and visual radio services. The rate control unit 370 allows the service stream analyzing unit 360 to grasp the identification information and the BSAC sampling frequency information, and receives the grasped information.

Next, the operation of each component will be described when the disaster broadcast multiplexing unit 300_1 provides a disaster broadcast.

The rate control unit 370 delivers the selected service information to the ETI frame analyzing unit 380 and transmits the first and second video service streams output from the disaster message generating unit 100 and the first and second visual radio service streams The ETI frame analyzing unit 380 selects and receives the video and visual radio service streams corresponding to the identified BSAC sampling frequencies (for example, 44.1 kHz and 48 kHz). The transmission rate control unit 370 notifies the identification information analyzing unit 390 of the identification information analyzed by the service stream analyzing unit 360 and transmits the video and visual information input to the identification information receiving unit 390, And controls the identification information modifying unit 390 so as to modify the identification information of the radio stream.

The rate control unit 370 compares the preliminary bit rate information received from the bit rate control unit 100 of the disaster message generation unit 100a with each service bit rate in the current ensemble and calculates insertion information To the null stream inserting unit 400.

The ETI frame analyzing unit 380 analyzes the services of the first and second video service streams received from the disaster message generating unit 100a and the respective subchannels in the first and second visual radio service streams, Selects a video service stream and a visual radio service stream matching the selected sampling frequency information, outputs the selected video service stream and the visual radio service stream to the identification information modifying unit 390, and outputs the audio and data service stream to the null stream inserting unit 400.

The identification information correcting unit 390 corrects the identification information in the inputted video and visual radio service stream to the identification information informed by the rate control unit 370 and outputs the same.

The null stream padding unit 400 selectively inserts null streams into the video and visual radio service streams and the audio and data service streams according to the null stream insertion information, and outputs the null streams. In the case of a video service stream, the null stream inserting unit 400 inserts a null stream in units of TS or ES, and inserts a null packet in consideration of the size of a stream that is increased in the subsequent externalization process .

Assume that the ensemble configuration of the first broadcast channel has a first video service bit rate of 544 Kbps, a first audio service bit rate of 128 Kbps, and a first data service bit rate of 96 Kbps, as in the above example. It is also assumed that video service encoder 120a encodes at a preliminary bit rate of 512 Kbps, audio service encoder 160 at a preliminary bit rate of 96 Kbps and data service encoder 170 at a preliminary bit rate of 64 Kbps. When the disaster multiplexer 300_1 receives the first broadcast channel, the null stream inserting unit 400 inserts a null stream of 32 Kbps into the video and visual service stream, a null stream of 32 Kbps to the audio service stream, Insert a 32 kbps null stream into the data service stream. Here, the bit rate of the video service encoder is a value including the bit rate generated in the external encoding.

The time information correcting unit 410 receives the video and visual radio service streams and the audio and data service streams in the null stream inserting unit 400 and rewrites and outputs the changed time information due to the insertion of the null packets. For example, in the case of correcting the time information for a TS packet, a program clock reference (PCR), an object clock reference (OCR), a decoding time stamp (DTS), a composition time stamp (CTS), a presentation time stamp And the continuation counter value of the TS packet, etc., are kept unbroken and have continuity, so that the time information of the stream is not changed at the time of generation of the TS packet filled with the null packet.

If the time information of the video service stream is not re-negotiated, the receiving module and the terminal can not properly decode the video service stream, so that the screen may be continuously disconnected or the terminal itself may not operate.

The external scaler 420 externally encodes the 188-byte TS packet input from the time information correcting unit 410 and outputs a video service stream in the form of a TS packet of 204 bytes. Similar to the output process of the video service stream, the visual radio service stream is also outputted through the external scaler 420. Exclusive encoding includes error correction coding and convolution interleaving. For example, the Reed-Solomon technique can be used for the error correction coding. An exaggerated video or visual radio service signal is robust to errors that occur during wireless transmission.

The ensemble multiplexer 430 multiplexes the disaster message input through the ETI frame analyzer 380 into the ETI frame input through the ETI frame generator 340 and outputs the multiplexed message. For example, the ensemble multiplexer 430 keeps all the portions of the ETI frame received from the ETI frame generator 340 as in the case of the regular broadcast, except for the FIC data of the MST (Main Stream Data) portion of the ETI frame And maintains the same as the FIC of the existing broadcast. The disaster message generator 100a converts the generated video and visual radio service stream, the audio and data service stream, and the like into a stream for disaster message generation and multiplexing. At this time, the bit rate for each service stream is adjusted to be equal to the bit rate of each service stream of regular broadcast.

The ETI output unit 440 outputs the ETI frame received from the ensemble emergency broadcast multiplexing unit 430 to the modulation unit 400_1 in the form of an ETI stream through a hardware interface.

The present invention is not limited to the above-described embodiment, and the disaster message generating unit 100a may selectively provide a null stream in each service stream. For example, a plurality of the disaster broadcast multiplexers 300_1, 300_2, and 300_3 may be merged into the disaster message generator 100a integrally or in a single module form. As described above, the disaster message generating unit 100a and the plurality of the disaster broadcast multiplexers 300_1, 300_2, and 300_3 may be implemented as independent modules or may be integrally implemented as a single module.

Hereinafter, a broadcast relay apparatus according to another embodiment of the present invention will be described with reference to FIG. 4 is a block diagram illustrating a disaster message generating unit that can be employed in a broadcast relay apparatus according to another embodiment of the present invention. Components having substantially the same functions as those shown in FIG. 2 are denoted by the same reference numerals, and detailed description of the corresponding components will be omitted.

4, in the present embodiment, the contents reproducing unit 130a for visual radio does not output the disaster contents for visual radio pre-stored at a pre-set bit rate as in the case shown in FIG. 2, and the AVC visual radio coding unit 130b Receives the video source from the outside, and encodes the video source in real time according to the preliminary bit rate provided from the bit rate control unit 110 to output the video ES for visual radio.

A broadcast relay apparatus according to another embodiment of the present invention will be described with reference to FIG. 5 is a block diagram illustrating a disaster message generating unit that can be employed in a broadcast relay apparatus according to another embodiment of the present invention. Components having substantially the same functions as those shown in FIG. 2 are denoted by the same reference numerals, and detailed description of the corresponding components will be omitted.

In this embodiment, the output of the BIFS encoder 122 is not input to the TS remultiplexers 150, 152, 154, and 156 as in the case shown in FIG. 2, and the first through fourth MPEG- And are input to the MPEG-2 TS multiplexing units 140c, 142c, 144c, and 146c, respectively. As shown in FIG. 7, each of the MPEG-4 MPEG-2 TS multiplexers 140c, 142c, 144c and 146c multiplexes the BIFS stream input to the OD (Object Descriptor) / BIFS generator 210 into MPEG- Level video ES and video signal ES for visual radio, and outputs it as an OD / BIFS stream. The first to fourth MPEG-4 MPEG-2 TS multiplexers 140c, 142c, 144c and 146c will be described later with reference to FIG.

A broadcast relay apparatus according to another embodiment of the present invention will be described with reference to FIG. 6 is a block diagram illustrating a disaster message generating unit that can be employed in a broadcast relay apparatus according to another embodiment of the present invention. The same reference numerals are used for components substantially the same as those shown in FIGS. 4 and 5, and a detailed description thereof will be omitted.

In the present embodiment, the visual radio content reproducing unit 130a does not output the visual radio source in which the visual radio source has been stored in advance and outputs it as a video ES type as in the case shown in FIG. 5, and the AVC visual radio encoding unit 130b Receives the video source, and encodes the video source in real time according to the preliminary bit rate provided from the bit rate control unit 110 to output the video ES.

Meanwhile, as a different embodiment from the above-described embodiments, the encoded video ES or the video ES for visual radio may be outputted in TS format instead of ES format in each of the encoders 124 and 130b. For example, each of the encoders 124 and 130b may be configured to output TS packetized video ES or video ES for visual radio corresponding to a predetermined bit rate using the identification information received from the FIC analyzing unit of the disaster multiplexer . In this case, for example, the MPEG-4 on MPEG-2 TS multiplexing unit 140, 142, 144, 146, or the MPEG-4 on MPEG-2 TS multiplexing unit 140, 142, 144, It can be considered that all of the remultiplexing units 150, 152, 154 and 156 are integrally combined with the encoding units 124 and 130b.

FIG. 7 is a schematic block diagram of an MPEG-4 on MPEG-2 TS multiplexing unit employable in the disaster message generating unit of FIGS. 5 and 6. FIG.

2 and 3, the OD / BIFS generating unit 210 generates an OD / BIFS stream according to the ISO / IEC 14496-1 standard and outputs the OD / BIFS stream to the SL packetizing unit 230. 4 and 5, the OD / BIFS generating unit 210 receives the stream output from the BIFS encoding and scheduler, generates an OD / BIFS stream, and then transmits the stream to the SL packetizing unit 230).

The IOD generator 220 generates an IOD (Initial Object Descriptor) stream according to the ISO / IEC 14496-1 standard and outputs it to the SL packetizer 230.

The SL packetizer 230 converts SL (Sync Layer) packets, which are synchronization packets, from each media stream input from the AVC video encoder, the first or second BSAC audio encoder, and the OD / BIFS generator 210 into 14496- 1 standard.

The PES packetizer 240 packetizes the SL packet input from the SL packetizer 230 into a Packetized Elementary Stream (PES) packet according to the ISO / IEC 13818-1 standard.

The section generating unit 250 generates and outputs the OD / BIFS SL packet and the IOD stream to the 14496 section and the PSI (Program Specific Information) section according to the ISO / IEC 13818-1 standard, respectively.

The TS multiplexing unit 260 multiplexes the section and PES packets input from the PES packetizing unit 240 and the section generating unit 250 into an MPEG-2 transport stream (TS) and outputs the same. The output of the TS multiplexing unit 260 may be input to each of the first to fourth remultiplexing units (see FIGS. 2 and 3) or may be input to the ETI frame generating unit (see FIGS. 4 and 5).

In this manner, the MPEG-4 on MPEG-2 TS multiplexing unit 140c multiplexes the disaster message signal for each channel of the broadcast by SL packetization, PES packetization, and TS multiplexing process to 188 bytes of TS packetized disaster broadcasting service Signal.

The MPEG-4 on MPEG-2 TS multiplexing unit 140c described above has first to fourth MPEG-4 on-MPEG-2 TS multiplexers 140c and 142c (FIG. 4 , 144c, and 146c. 4 except that the OD / BIFS generator 210 receives the stream output from the BIFS encoding and scheduler 122, the MPEG-4 on MPEG- 4 on MPEG-2 TS multiplexers 140, 142, 144, and 146 of FIG. 2 and FIG. 3, respectively.

As described above, the optimal embodiment of the present invention has been disclosed through the detailed description and the drawings. The terms are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention described in the meaning or the claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: Broadcast relay device
12, 14, 16:
100, 100a, 100b, 100c, 100d: a disaster message generating unit
110: Bit rate determination and control unit
120a, 120b, 120c, 120d: a video service encoder
300: Disaster broadcast multiplexer
400:
500:
600: RF transmitter

Claims (15)

delete delete delete delete delete delete A broadcast relay apparatus for providing a disaster broadcast,
Multiplexes a first audio stream at a first sampling frequency and a source stream for a disaster broadcast and multiplexes a second audio stream and a source stream at a second sampling frequency different from the first sampling frequency, A disaster message generating unit for generating a stream;
A first disaster broadcast multiplexer for selectively inserting null streams into the first service stream, multiplexing the null streams according to a first broadcast channel standard having a first service bit rate, and transmitting the multiplexed streams; And
And a second disaster multiplexer multiplexing a null stream into the second service stream and multiplexing the null stream with a second broadcast channel standard having a second service bit rate different from the first service bit rate,
Wherein the disaster message generating unit comprises:
And a first and a second audio encoding unit encoding the audio source of the first sampling frequency and the audio source of the second sampling frequency at a preliminary bit rate which is equal to or less than a minimum service bit rate of the first and second service bit rates,
Wherein the audio streams and the source stream are encoded with a spare bit rate determined to be equal to or less than a minimum bit rate among service bit rates provided in the standards of the first and second broadcast channels
Wherein The method of claim 7, wherein the disaster message generating unit
A BIFS encoding unit for encoding Binary Format for Scenes (BIFS) data and outputting a BIFS stream;
A first TS multiplexer for multiplexing the source stream and the audio stream of the first sampling frequency to output a first transport stream (TS) stream;
A second TS multiplexer for multiplexing the source stream and the audio stream of the second sampling frequency to output a second TS stream;
A first TS remultiplexer for multiplexing the BIFS stream and the first TS stream to generate the first service stream; And
And a second TS remultiplexer for multiplexing the BIFS stream and the second TS stream to generate the second service stream
Wherein The method of claim 7, wherein the disaster message generating unit
A BIFS encoding unit for encoding Binary Format for Scenes (BIFS) data and outputting a BIFS stream;
A first TS multiplexer for multiplexing the source stream, the audio stream of the first sampling frequency and the BIFS stream to output a first service stream; And
And a second TS multiplexer for multiplexing the source stream and the audio stream of the second sampling frequency and the BIFS stream to output a second service stream
Wherein 8. The method of claim 7, wherein each of the disaster broadcast multiplexing units
An FIC analyzer for receiving first and second fast information channels (FICs) by receiving regular broadcasts of the first and second broadcast channels;
A control unit for providing null stream insertion information according to the spare bit rate and the service bit rate when a spare bit rate that is less than a minimum bit rate among the first and second service bit rates is determined from the fast information channels;
A null stream inserter for selectively inserting a null stream into the visual radio service stream output according to the null stream inserting information;
And an ensemble multiplexing unit for multiplexing a part of the frames of the regular broadcast signal provided in the broadcast channel so as to convert the frames into a visual radio service stream in which the null stream is inserted
Wherein 11. The method of claim 10, wherein each of the disaster broadcast multiplexing units
Analyzing a normal video stream and a visual radio service stream received from the broadcast channel, extracting identification information and sampling frequency information of the audio stream, and analyzing a service stream analyzed to provide the identification information and the sampling frequency information to the controller part;
A frame analyzer for selecting one visual service service stream corresponding to the sampling frequency information among the service streams for the first and second visual radio under the control of the control unit;
And an identification information modification unit for modifying the identification information of the selected and received visual radio service stream to the extracted identification information
Wherein The method of claim 10, wherein the disaster message generating unit
And a bit rate control unit receiving information on the first and second service bit rates from the FIC analyzing unit and determining the spare bit rate from the information on the first and second service bit rates
Wherein delete delete delete

Images