EP2328287A2 - Relais de diffusion d'un signal de service d'urgence - Google Patents

Relais de diffusion d'un signal de service d'urgence Download PDF

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Publication number
EP2328287A2
EP2328287A2 EP10193080A EP10193080A EP2328287A2 EP 2328287 A2 EP2328287 A2 EP 2328287A2 EP 10193080 A EP10193080 A EP 10193080A EP 10193080 A EP10193080 A EP 10193080A EP 2328287 A2 EP2328287 A2 EP 2328287A2
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EP
European Patent Office
Prior art keywords
stream
broadcasting
service
emergency
bit rate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10193080A
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German (de)
English (en)
Other versions
EP2328287A3 (fr
Inventor
Yong Hoon Lee
So Ra Park
Geon Kim
Yong Tae Lee
Jin Min Kim
Myung Sun Baek
Yun Jeong Song
Soo In Lee
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Electronics and Telecommunications Research Institute ETRI
Original Assignee
Electronics and Telecommunications Research Institute ETRI
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Publication date
Priority claimed from KR1020090117141A external-priority patent/KR101320544B1/ko
Priority claimed from KR1020100045983A external-priority patent/KR101420188B1/ko
Application filed by Electronics and Telecommunications Research Institute ETRI filed Critical Electronics and Telecommunications Research Institute ETRI
Publication of EP2328287A2 publication Critical patent/EP2328287A2/fr
Publication of EP2328287A3 publication Critical patent/EP2328287A3/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/02—Arrangements for relaying broadcast information
    • H04H20/06—Arrangements for relaying broadcast information among broadcast stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/59—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for emergency or urgency

Definitions

  • the present invention relates to a method of providing emergency broadcasting and an apparatus of relaying broadcasting implementing the same, and more particularly, to a method for providing emergency broadcasting for providing emergency services and an apparatus for relaying broadcasting implementing the same.
  • DMB Terrestrial digital multimedia broadcasting
  • DAB digital audio broadcasting
  • the apparatus for relaying digital multimedia broadcasting should be installed in areas such as shadow areas as well as a tunnel or a subway in order to increase the broadcasting receiving rate.
  • the apparatus for relaying terrestrial digital multimedia broadcasting places emphasis on a function of relaying broadcasting signals of various channels.
  • the apparatus for replaying broadcasting does not have a function capable of coping with emergency situations.
  • the apparatus for relaying broadcasting performs a function of relaying broadcasting signals in specific areas.
  • the digital multimedia broadcasting according to the related art provides the same broadcasting services to server areas, not providing broadcasting services only to specific areas.
  • only emergency broadcasting or disaster broadcasting service may be provided to the entire areas, not the specific areas.
  • the emergency related signals generated in the specific areas are encoded into signals of various channels that are transmitted and received to and from the apparatus for relaying broadcasting, such that encoders corresponding to the number of channels in the apparatus for relaying broadcasting should be installed independently.
  • the configuration of the apparatus for relaying broadcasting is complicated.
  • DMB Terrestrial digital multimedia broadcasting
  • DAB digital audio broadcasting
  • the apparatus for relaying digital multimedia broadcasting should be installed in areas such as shadow areas as well as a tunnel or a subway in order to increase the broadcasting receiving rate.
  • the apparatus for relaying terrestrial digital multimedia broadcasting places emphasis on a function of relaying broadcasting signals of various channels.
  • the apparatus for replaying broadcasting does not have a function capable of coping with emergency situations.
  • the apparatus for relaying broadcasting performs a function of relaying broadcasting signals in specific areas.
  • the digital multimedia broadcasting according to the related art provides the same broadcasting services to server areas, not providing broadcasting services only to specific areas.
  • only emergency broadcasting or disaster broadcasting service may be provided to the entire areas, not the specific areas.
  • the emergency related signals generated in the specific areas are encoded into signals of various channels that are transmitted and received to and from the apparatus for relaying broadcasting, such that encoders corresponding to the number of channels in the apparatus for relaying broadcasting should be installed independently.
  • the configuration of the apparatus for relaying broadcasting is complicated. For example, when there is a need to perform the emergency broadcasting due to the occurrence of emergency situations, if the audio sampling frequencies between the videos and visual radio services that are received a little while ago and the video and visual radio services for emergency broadcasting are not identical with each other, there may occur a problem in that a terminal of receiving terrestrial DMB is malfunctioned.
  • An exemplary embodiment of the present invention provides a method for providing emergency broadcasting, including: encoding the emergency service signals at a predetermined bit rate; optionally padding null stream in the encoded emergency service signals and performing a signal process on the null stream to generate a first emergency message signal having a first main service bit rate of a first broadcasting channel that is the bit rate or more; and optionally padding the null stream in the encoded emergency service signals and performing a signal process on the null stream to generate a second emergency message signal having a second main service bit rate of a second broadcasting channel different from the first main service bit rate that is the bit rate or more.
  • Another exemplary embodiment of the present invention provides an apparatus for relaying digital multimedia broadcasting (DMB) for providing an emergency service signal, including: an emergency message generator that inputs and encodes the emergency service signal at a predetermined bit rate, optionally pads the null stream to the encoded emergency service signal, performs signal processing, generates in a series first and second emergency message signals having a first main service bit rate of a first broadcasting channel and a second main service bit rate of a second broadcasting channel, respectively, which are different and the bit rate or more; a first emergency broadcasting multiplexer that multiplexing the first emergency message signal by the specification of the first broadcasting channel and transmitting the multiplexed signal; and a second emergency broadcasting multiplexer that multiplexing the second emergency message signal by the specification of the second broadcasting channel and transmitting the multiplexed signal.
  • DMB digital multimedia broadcasting
  • Still another exemplary embodiment of the present invention provides an apparatus for relaying digital multimedia broadcasting (DMB) for providing an emergency service signal configured of a video signal, an audio signal, and a data signal, including: an emergency message generator that inputs and encodes the video signal, the audio signal, and the data signal at predetermined corresponding bit rates, and generates a reserved frame multiplexed into a stream type from the encoded signals; a first emergency broadcasting multiplexer that demultiplexes the reserved frame to recover the encoded signals, and pads and multiplexes optionally a null stream into the encoded signals to be matched with a first video main bit rate, a first audio main bit rate, and a first data main bit rate of a first broadcasting channel; and a second emergency broadcasting multiplexer that demultiplexes the reserved frame to recover the encoded signals, and pads and multiplexes optionally a null stream into the encoded signals to be matched with a second video main bit rate, a second audio main bit rate, and a second data main bit
  • Yet another exemplary embodiment of the present invention provides an apparatus for relaying broadcasting, including: an emergency message generator that encodes an emergency service signal at a predetermined bit rate, optionally pads and multiplexes a null stream into the encoded emergency service signal, and has first main service bit rates of a first broadcasting channel and a second main service bit rates of a second broadcasting channel, respectively, that are the predetermined bit rate or more and different from each other and generates first and second emergency message signals each multiplexed by specifications of the first and second broadcasting channels; and first and second modulators that modulates the first and second emergency message signals, respectively.
  • an emergency message generator that encodes an emergency service signal at a predetermined bit rate, optionally pads and multiplexes a null stream into the encoded emergency service signal, and has first main service bit rates of a first broadcasting channel and a second main service bit rates of a second broadcasting channel, respectively, that are the predetermined bit rate or more and different from each other and generates first and second emergency message signals each multiplexed by specifications
  • An exemplary embodiment of the present invention provides a method for providing emergency broadcasting, including: relaying regular broadcasting of a plurality of broadcasting channels at normal times; and providing emergency broadcasting according to specifications of each of the broadcasting channels when emergency situations are generated, wherein the providing the emergency broadcasting includes: first multiplexing audio streams of a first sampling frequency and source streams for the emergency broadcasting; second multiplexing audio streams of a second sampling frequency different from the first sampling frequency and the source stream; generating first emergency broadcasting service streams having first service bit rates of a first broadcasting channel by optionally padding null streams into the first multiplexed streams; and generating second emergency broadcasting service streams having second service bit rates of a second broadcasting channel different from the first service bit rates by optionally padding the null streams into the second multiplexed streams.
  • Another exemplary embodiment of the present invention provides an apparatus for relaying broadcasting for providing emergency broadcasting, including: an emergency message generator that multiplexes an audio stream of a first sampling frequency and a source stream for emergency broadcasting and multiplexes an audio stream of a second sampling frequency different from the first sampling frequency, and the source stream to generate first and second service streams; a first emergency broadcasting multiplexer that optionally pads a null stream into the first service stream and multiplexes and transmits the first service stream by a specification of a first broadcasting channel of a first service bit rate; and a second emergency broadcasting multiplexer that optionally pads a null stream into the second service stream and multiplexes and transmits the second service stream by a specification of a second broadcasting channel having a second service bit rate different from the first service bit rate, wherein the audio streams and the source stream are encoded at a reserved bit rate, which is the minimum service bit rate or less in the first and second service bit rates.
  • Still another exemplary embodiment of the present invention provides a multiplexer of an apparatus for relaying broadcasting that broadcasts a plurality of regular broadcasting streams including audio streams of different sampling frequencies, the multiplexer, including: an FIC analyzing unit that receives any one regular broadcasting stream in the plurality of regular broadcasting streams and extracts fast information channels (FICs); a service stream analyzing unit that analyzes the received regular broadcasting stream to extract identification information and sampling frequency information of the audio stream in the received regular broadcasting stream; a frame analyzing unit that optionally receives one service stream that is matched with the sampling frequency information extracted from the service streams of different sampling frequencies generated and provided for emergency broadcasting; an identification information correcting unit that corrects the identification information of the selected and received service stream into the extracted identification information; a controller that provides null stream padding information, when a reserved bit rate is determined from the fast information channels, in accordance with the reserved bit rate; a null stream padding unit that optionally pads a null stream into the service stream in accordance with the null stream padding information; and an ensemble
  • Yet another exemplary embodiment of the present invention provides a method for multiplexing a plurality of regular broadcasting streams including audio streams of different sampling frequencies, including: receiving any one regular broadcasting stream in the plurality of regular broadcasting streams; analyzing the received regular broadcasting stream to extract identification information and sampling frequency information of the audio stream in the received regular broadcasting stream; generating service streams corresponding to the different sampling frequencies for emergency broadcasting; selecting one service stream that is matched with the extracted sampling frequency information in the generated service streams; correcting identification information of the selected service stream into the extracted identification information; optionally padding a null stream into the selected service stream; and multiplexing some of the frames of the received regular broadcasting streams to be changed into the service stream into which the null stream is padded.
  • FIG. 1 shows an apparatus for relaying broadcasting according to exemplary embodiments of the present invention used for digital multimedia broadcasting (DMB) for providing emergency service signals;
  • DMB digital multimedia broadcasting
  • FIG. 2 is a block diagram of an emergency message generator applied to the apparatus for relaying broadcasting according to a first exemplary embodiment of the present invention
  • FIG. 3 is a block diagram of a null stream padding unit shown in FIG. 2 ;
  • FIG. 4 is an emergency broadcasting multiplexer applied to the apparatus for relaying broadcasting according to the first exemplary embodiment of the present invention
  • FIG. 5 is an emergency message generator applied to the apparatus for relaying broadcasting according to the second exemplary embodiment of the present invention.
  • FIG. 6 is an emergency broadcasting multiplexer applied to the apparatus for relaying broadcasting according to a second exemplary embodiment of the present invention
  • FIG. 7 is an emergency message generator applied to the apparatus for relaying broadcasting according to a third exemplary embodiment of the present invention.
  • FIG. 8 is an emergency broadcasting multiplexer applied to the apparatus for relaying broadcasting according to the third exemplary embodiment of the present invention.
  • FIG. 9 is an emergency message generator applied to the apparatus for relaying broadcasting according to a fourth exemplary embodiment of the present invention.
  • FIG. 10 is an emergency broadcasting multiplexer applied to the apparatus for relaying broadcasting according to the fourth exemplary embodiment of the present invention.
  • FIG. 11 is a flow chart showing a method for providing emergency broadcasting for providing emergency service signals using the apparatus for relaying broadcasting according to the exemplary embodiments of the present invention
  • FIG. 12 is a flow chart showing a process of the correction of time information and the outer coding process of the video signal
  • FIG. 13 is a flow chart showing a method for providing emergency broadcasting for providing emergency service signals using the apparatus for relaying broadcasting according to another exemplary embodiments of the present invention
  • FIG. 14 shows an apparatus for relaying broadcasting according to another exemplary embodiments of the present invention used for digital multimedia broadcasting (DMB) for providing emergency service signals;
  • DMB digital multimedia broadcasting
  • FIG. 15 is an emergency message generator applied to the apparatus for relaying broadcasting according to a fifth exemplary embodiment of the present invention.
  • FIG. 16 is an emergency message generator applied to the apparatus for relaying broadcasting according to the sixth exemplary embodiment of the present invention.
  • FIG. 17 is a block diagram showing an apparatus for relaying broadcasting according to the exemplary embodiments of the present invention.
  • FIG. 18 is a block diagram showing the emergency message generator adoptable for the apparatus for relaying broadcasting according to an exemplary embodiment of the present invention.
  • FIG. 19 is a block diagram showing an emergency broadcasting multiplexer according to an exemplary embodiment of the present invention.
  • FIG. 20 is a block diagram showing the emergency message generator adoptable for the apparatus for relaying broadcasting according to another exemplary embodiment of the present invention.
  • FIG. 21 is a block diagram showing the emergency message generator adoptable for the apparatus for relaying broadcasting according to another exemplary embodiment of the present invention.
  • FIG. 22 is a block diagram showing the emergency message generator adoptable for the apparatus for relaying broadcasting according to another exemplary embodiment of the present invention.
  • FIG. 23 is a schematic block diagram of the MPEG-4 on MPEG-2 TS multiplexer adoptable for the emergency message generator of FIGS. 21 and 22 .
  • FIG. 1 shows an apparatus for relaying broadcasting according to exemplary embodiments of the present invention used for digital multimedia broadcasting (DMB) for providing emergency service signals.
  • an apparatus 10 for relaying broadcasting used for a DMB for providing emergency service signals basically serves to relay various channel broadcasting signals and generates streams that serve emergency service signals input from the outside to various channels in consideration of emergency situations generated in specific areas and provides them to DMB terminals in the corresponding areas.
  • the apparatus 10 for relaying broadcasting may be installed in an area where buildings are concentrated and a shadow area such as mountains, tunnels, subway, etc., in order to improve the quality of broadcasting signals.
  • the apparatus 10 for relaying broadcasting may be configured to include an emergency message generator 100 that receives emergency service signals to generate emergency message streams having main service bit rates for each broadcasting channel, emergency broadcasting multiplexers 200a, 200b, and 200c that multiplex each of the emergency message streams by the specification of the corresponding broadcasting channel, modulators 300a, 300b, and 300c that modulate each of the multiplexed emergency message streams using a predetermined scheme, for example, a coded orthogonal frequency division multiplexing (COFDM) scheme, and relaying units 400a, 400b, and 400c that relay the regular broadcasting signal of each of the broadcasting channels.
  • a predetermined scheme for example, a coded orthogonal frequency division multiplexing (COFDM) scheme
  • COFDM coded orthogonal frequency division multiplexing
  • the emergency broadcasting multiplexers 200a, 200b, and 200c are provided in number corresponding to the number of relayed broadcasting channels to receive the broadcasting channels, such that they may provide main service related information and identification information for each broadcasting channel to the emergency message generator 100.
  • the emergency message generator 100 may generate the emergency message streams by using the above-mentioned information.
  • the apparatus 10 for relaying broadcasting may further include a switching unit 500 that provides the regular broadcasting signals received from the relaying units 400a, 400b, and 400c at normal times to DMB terminals of users through an RF transmitter 600 and when multiplexed emergency message streams of specific areas are input, stops receiving the regular broadcasting signals and provides the multiplexed emergency message streams to various broadcasting channels of the DMB terminals through the RF transmitter 600
  • the switching unit 500 may switch and output the regular broadcasting signals and the multiplexed emergency message streams by the control of a system controller 520 when the emergency situations occur.
  • the RF transmitter 600 can receive one of the regular broadcasting signal and the multiplexed emergency message stream for each channel as channel signals having an intermediate frequency (IF) band, for example, a system bandwidth of 1.536 MHz and send out them to terrestrial DMB channels having a bandwidth of 6 MHz.
  • IF intermediate frequency
  • the emergency service signals include audio signals, video signals, and data signals
  • the apparatus for relaying broadcasting may serve the regular broadcasting signals and the multiplexed emergency message streams to at least three channels and can include at least one of the audio signal, the video signal, and the data signal to provide a DMB service as well as a digital audio broadcasting service or a digital video broadcasting service.
  • FIG. 2 is a block diagram of an emergency message generator used in the apparatus for relaying broadcasting according to a first exemplary embodiment of the present invention
  • FIG. 3 is a block diagram of a null stream padding unit shown in FIG. 2 .
  • the emergency message generator 100 may be configured to include an audio encoder 110, a video encoder 112, and a data encoder 114 that each receive the audio signal, the video signal, and the data signal configuring emergency message signal and encode them with an audio bit rate, a video bit rate, and a data bit rate.
  • the audio signals are input to the video encoder 112 together with the video signal. Thereafter, the video encoder 112 encodes them, thereby making it possible to provide the DMB services. Further, the audio bit rate, the video bit rate, and the data bit rate each may be set to the corresponding predetermined bit rates.
  • the encoded video signals may be generated in an element stream (ES) packet type or a transport stream (TS) packet type.
  • the audio/video/data bit rates may be determined by a transmission rate controller 116.
  • the transmission rate controller 116 may receive information related to first to third main service bit rates included in fast information channels (FICs) of first to third broadcasting channels and determine predetermined bit rates as a minimum main service bit rate or less among those.
  • FICs fast information channels
  • each of the main service bit rates may be determined based on the audio main bit rate, the video main bit rate, and the data main bit rate for each broadcasting channel.
  • the audio bit rate since the audio bit rate may be determined as the first to third data main bit rates or less, it may be determined to be identical with the minimum bit rate among the first to third audio main bit rates.
  • the data bit rate may also be determined as the first to third audio main bit rates or less, it may be determined to be identical with the minimum bit rate among the first to third audio main bit rates.
  • the video bit rate may be smaller than the minimum bit rate among the first to third video main bit rates in consideration of the bits added during an outer coding process later. Therefore, the determined bit rate may be informed to the audio encoder 110, the video encoder 112, and the data encoder 114 through the transmission rate controller 116.
  • First to third TS packet units 118a, 118b, and 118c may receive the identification information provided from the first to third emergency broadcasting multiplexers 200a, 200b, and 200c and output the encoded video signal in the ES packet type as the transport stream (TS) packetized video signal.
  • the TS packet is a signal generated by packetizing the ES packet by MPEG-2.
  • the identification information may be information related to sub-channel data among the fast information channel (FIC) and the sub-channel data for each broadcasting channel, which are received by the first to third emergency broadcasting multiplexers 200a, 200b, and 200c.
  • the sub-channel data has a region where the audio/video/data signals are allocated as a main service channel (MSC) from the broadcasting channel and the identification information, which is information related to an outer decoded video signal among these signals, may be various PID information at an MPEG-2 level such as PAT PID, PMT PID, PCR PID, video and audio related PID, OD, and BIFs PID, etc. and various ES ID related information corresponding to an MPEG-4 level.
  • the first to third TS packet units 118a, 118b, and 118c may output the 188 bytes TS packetized video signals by being subjected to SL packetizing and PES packetizing processes and a TS multiplexing process for each broadcasting channel by using the identification information.
  • the encoded video signals may be output as the TS packet type, not the ES packet type from the video encoder 112.
  • the video encoder 112 may receive the identification information from the identification information analyzing units 214 of the first to third emergency broadcasting multiplexers 200a, 200b, and 200c to be described below and output the TS packetized identification information corresponding to the predetermined video bit rates by using the identification information. Therefore, in the exemplary embodiment, the TS packet units 118a, 118b, and 118c will be omitted.
  • the emergency message generator 100 may include first to third null stream padding units 120a, 120b, and 120c that receive the encoded audio signal, the TS packetized video signal, and the encoded data signal and selectively pad the null streams to match each of the main service bit rates of the first to third broadcasting signals.
  • each of the null stream padding units 120a, 120b, and 120c may include an audio null padding unit 122, a video null padding unit 124, and a data null inserting unit 126 that selectively pad the null streams into each of the encoded signals.
  • each of the null stream padding units 120a, 120b, and 120c may receive the information related to the first to third main service bit rates included in the first to third fast information channels (FICs) of the first to third broadcasting channels through the transmission rate controller 116.
  • each of the main service bit rates may be determined based on the audio main bit rate, the video main bit rate, and the data main bit rate. Therefore, in order to determine the size of the null stream selectively padded into the encoded signals, the transmission rate controller 116 may provide the information related to the audio/video/data main bit rates of the corresponding broadcasting channels into the audio null padding unit 122, the video null padding unit 124, and the data null padding unit 126 that serve as the corresponding broadcasting channel.
  • each of the audio main bit rates, the video main bit rates, and the data main bit rates may be divided into the first to third audio main bit rates, the first to third video main bit rates, and the first to third data main bit rates.
  • the audio main bit rate, the video main bit rate, and the data main bit rate may be the bit rates that are set in the audio service, the video service, and the data service, respectively, in the specific broadcasting channel. Further, at least one of the first to third audio main bit rates may be set to be different from the remaining audio main bit rates. Similar to this, the first to third video main bit rates and the first to third data main bit rates may also be set to be different from each other as in the first to third audio main bit rates.
  • a process of processing the emergency service signals by using the audio encoder 110, the video encoder 112, the data encoder 114, the first to third TS packet units 118a, 118b, and 118c and the null stream padding units 120a, 120b, and 120c selectively padding the null stream to correspond to the main bit rates for each broadcasting channel will be described by way of example.
  • the emergency service signal may be configured to include the audio signal, the video signal, and the data signal as described above.
  • an ensemble configuration of the first broadcasting channel has the first audio main bit rate of 128 Kbps, the first video main bit rate of 544 Kbps, and the first data main bit rate of 96 Kbps
  • an ensemble configuration of the second broadcasting channel has the second audio main bit rate of 96 Kbps, the second video main bit rate of 512 Kbps, and the second data main bit rate of 128 Kbps
  • an ensemble configuration of the third broadcasting channel has the third audio main bit rate of 192 Kbps, the third video main bit rate of 544 Kbps, and the third data main bit rate of 64 Kbps.
  • the audio encoder 110 encodes the audio signal at 96 Kbps or less that is a minimum bit rate among the above-mentioned audio main bit rates. Similar to this, the data encoder 114 encodes the data signals at 64 Kbps or less. However, when the encoded video signal is generated as the element stream packet, the video encoder 112 encodes the video signals below 512 Kbps in consideration of bits added during the outer coding process later. In addition to this, the encoded video signal generates the TS packetized video signals of 188 bytes that are not outer-coded to be matched with each of the identification information of the broadcasting channels through the first to third TS packet units 118a, 118b, and 118c.
  • the audio null padding unit 122 of the first null stream padding unit 120a pads the null stream corresponding to 32 (128-96) Kbps into the encoded audio signal and the audio null padding unit of the third null stream padding unit 120c pads the null stream corresponding to 96 (192-96) Kbps.
  • the audio null padding unit of the null stream padding unit 120c does not need to pad the null stream in the encoded audio signal. In other words, the null stream is padded into the encoded audio signal to be matched with the first to third audio main bit rates.
  • the padding of the null stream is said that the null stream is "optionally” padded into the encoded signal.
  • the data null padding units 126 of the first to third null stream padding units 120a, 120b, and 120c optionally pads the null stream into the encoded data signal to be matched to the first to third data main bit rates.
  • the video null padding units 124 of the first to third null stream padding units 120a, 120b, and 120c optionally pads the null stream into each of the TS packetized video signals to be lower than the first to third video main service rates in consideration of bits added during the outer coding process later.
  • the emergency message generator 100 may further include first to third time information correcting units 130a, 130b, and 130c that correct the time information on the video signal into which the null stream among the TS packetized video signals passing through the video null padding units 124 of the first to third null stream padding units 120a, 120b, and 120c is padded and first to third outer coders 140a, 140b, and 140c that performs the outer coding process on the corrected video signal and the non-corrected video signal.
  • the first to third time information correcting units 130a, 130b, and 130c may correct program clock reference (PCR), object clock reference (OCR), decoding time stamp (DTS), composition time stamp (CTS), presentation time stamp (PTS), and continuity_counter of TS packet, etc., that are included in the video signal into which the null stream is padded, based on the padding passage time of the null stream. Therefore, the corrected video signals may continuously serve pictures to the DMB terminal without generating the decoding error in the DMB terminal.
  • PCR program clock reference
  • OCR object clock reference
  • DTS decoding time stamp
  • CTS composition time stamp
  • PTS presentation time stamp
  • continuity_counter of TS packet etc.
  • the first to third outer coders 140a, 140b, and 140c includes an error correction coding and a convolution interleaving process.
  • the error correction coding may use, for example, a Reed-Solomon coding scheme.
  • both the corrected video signal and the non-corrected video signal are input to the first to third outer coders 140a, 140b, and 140c and are output, including the TS packet of 204 bytes.
  • each of the corrected and the non-corrected video signals are input to each of the first to third outer coders 140a, 140b, and 140c and are output to be matched to the first to third video main bit rates.
  • the video signals that are subjected to the outer coding process and are transmitted to the DMB terminal withstand against the errors during the wireless transmission process.
  • the emergency service signals including the above-mentioned audio signal, video signal, and data signal are processed through the encoders 110, 112, and 114, the null stream padding units 120a, 120b, and 120c, the time information correcting units 130a, 130b, and 130c, and the outer coders 140a, 140b, and 140c, such that they are output as the audio signals having the first to third audio main bit rates, the video signals having the first to third video main bit rates, and the data signals having the first to third video main bit rates.
  • the audio/video/data signals having the first audio/video/data main bit rates configure a first emergency message signal.
  • Each of the second and third emergency message signals is also configured as the audio/video/data signals having the corresponding audio/video/data main bit rates.
  • the emergency message generator 100 multiplexes the audio signal, the video signal, and the data signals included in each of the first to third emergency message signals, such that it may further include the first to third emergency message stream units 150a, 150b, and 150c generating the first to third emergency message streams.
  • the emergency message streams may be transmitted to the first to third emergency broadcasting multiplexers 200a, 200b, and 200c for each broadcasting channel.
  • FIG. 4 is an emergency broadcasting multiplexer applied to the apparatus for relaying broadcasting according to the first exemplary embodiment of the present invention.
  • the first to third emergency broadcasting multiplexers 200a, 200b, and 200c are the same structure each other and therefore, the first emergency broadcasting multiplexer 200a will be described below.
  • the emergency broadcasting multiplexer 200a may include an RF receiver 210 that receives the regular broadcasting signals of the broadcasting channel through an antenna to extract the fast information channel (FIC) and the sub-channel data.
  • the fast information channel may be the channel information broadcasting the audio/video/data main bit rates and various information.
  • the fast information channel includes the channel information relating to the number of services, the size of service data, etc., that are provided from the current broadcasting channel in addition to the main bit rates.
  • the sub-channel data are a main service channel (MSC) as described above and the bit rates owned by the audio/video/data signals allocated to the main service channel are the same as the audio/video/data main bit rates.
  • the emergency broadcasting multiplexer 200a may include a sub-channel analyzing unit 212 that analyzes the outer-coded portion, the identification information, and the video main bit rates related information that are included in the video signals of the sub-channel data.
  • the identification information analyzing unit 214 may outer-decode the video signals according to the analyzed video signal and extract the identification information and transmit it to the first TS packet unit 118a.
  • the emergency broadcasting multiplexer 200a may further include an FIC analyzing unit 220 that extracts information related to the audio/video/data main bit rates from the fast information channel and transmits them to the transmission rate controller 116 and an ETI frame generator 230 that generates an ensemble transport interface (ETI) signals based on the sub-channel data and the broadcasting channel information included in the FIC.
  • the ETI signals may include the main service channel and the fast information channel from which the regular broadcasting signals are removed and may be generated to have the specifications of the broadcasting channel.
  • the emergency broadcasting multiplexer 200a may include an ensemble multiplexer 240 that receives the emergency message stream output from the emergency message stream unit 150a and multiplexes it into the ETI signal meeting the specifications of the broadcasting channel and an ETI output unit 250 that outputs the emergency message stream multiplexed into the ETI signals to the modulator.
  • the audio/video/data signals related to the emergency situations generated in the specific areas are coded into a predetermined bit rates by using the audio/video/data encoders 110, 112, and 114 and the null streams to be matched to the main bit rates owned by each of various broadcasting channels of the DMB are optionally padded.
  • the emergency service signals into which the null streams are padded are multiplexed into the various broadcasting specifications to serve the emergency broadcasting, such that the emergency related broadcasting of the specific areas can be provided to several broadcasting channels of the DMB terminals in the corresponding areas.
  • the encoders that code each of the audio/video/data signals into the main bit rates of the various broadcasting channels use one encoder corresponding to each of the audio, video, and data without being provided to correspond to the number of broadcasting channels, thereby making it possible to simplify the configuration of the apparatus 10 for relaying broadcasting.
  • FIG. 5 is an emergency message generator applied to the apparatus for relaying broadcasting according to the second exemplary embodiment of the present invention.
  • the relaying units 400a, 400b, and 400c, the modulators 300a, 300b, and 300c, the switching unit 500, and the RF transmitter 600 of the second exemplary embodiment are substantially the same as the components described in the first exemplary embodiment and therefore, the detailed description thereof will be omitted.
  • the emergency message generator 100 may be configured to include an audio encoder 710, a video encoder 712, and a data encoder 714 that each encodes the audio signal, the video signal, and the data signal related to the emergency situations with an audio bit rate, a video bit rate, and a data bit rate.
  • each of the audio/video/data bit rates may be set by being informed with the corresponding bit rates determined in the bit rate controller 716.
  • the bit rate controller 716 may determine the audio/video/data bit rates based on the fast channel information (FIC) for each broadcasting channel transmitted from the first to third emergency broadcasting multiplexers 200a, 200b, and 200c.
  • the bit rate controller 716 may adopt the audio bit rates at the minimum audio main bit rates or less among the audio main bit rates of the main service channel included in the fast channel information. Similar to this, the bit rate controller 716 may adopt the data bit rate at the minimum data main bit rate or less.
  • the video bit rate may be smaller than the minimum bit rate among the video main bit rates in consideration of the bits added during an outer coding process later.
  • the video signal encoded at the video bit rate may be generated in the element stream packet type.
  • bit rate controller 716 may transmit the information related to the audio/video/data bit rates to the first to the third emergency broadcasting multiplexers 200a, 200b, and 200c.
  • the emergency message generator 100 may include a reserved frame generator 720 that multiplexes the encoded audio and data signals and the video signal having the ES packet type into a stream type for generating the reserved frame and a reserved frame distributing unit 730 that distributes the reserved frames into the first to third emergency broadcasting multiplexers 200a, 200b, and 200c.
  • the reserved frame may be configured to include frame in service transport interface (STI), asynchronous serial interface (ASI), Internet protocol (IP), and ETI types.
  • FIG. 6 is an emergency broadcasting multiplexer applied to the apparatus for relaying broadcasting according to another exemplary embodiment of the present invention.
  • the first to third emergency broadcasting multiplexers 200a, 200b, and 200c have the same structure each other and therefore, the first emergency broadcasting multiplexer 200a will be described below.
  • the emergency broadcasting multiplexer 200a may include a reserved frame analyzing unit 805 that demultiplexes the distributed reserved frame to recover the encoded audio and data signals and the video signal having the ES packet type.
  • the emergency broadcasting multiplexer 200a may include a TS packet unit 840 that outputs the video signal having the ES packet type recovered by using the identification information as the transport stream (TS) packetized video signal.
  • the identification information may be the video signal related information in the sub-channel data for each broadcasting channel received through an RF receiving unit 825.
  • the identification information may be provided to the TS packet unit 840 through the sub-channel analyzing unit 830 and the identification information analyzing unit 835.
  • the encoded video signals may be output as the TS packet type, not the ES packet type from the video encoder 712.
  • the video encoder 712 may receive the identification information from the identification information analyzing units 835 of the first to third emergency broadcasting multiplexers 200a, 200b, and 200c to be described below and output the TS packetized video signals corresponding to the predetermined video bit rates by using the identification information. Therefore, the TS packet units 840 will be omitted in the present exemplary embodiment.
  • the sub-channel analyzer 830, the identification information analyzing unit 835, the TS packet unit 840, and the identification information in the present exemplary embodiment have substantially the same function and/or structure as the sub-channel analyzing unit 212, the identification information analyzing unit 214, the TS packet unit 118a, and the identification information as described in FIG. 4 and therefore, the detailed description thereof will be omitted.
  • the emergency broadcasting multiplexer 200a may include a null stream padding unit 810 that optionally pads the null stream into the encoded audio and data signals and the TS packetized video signal to be matched with the audio/data/video main bit rates and a transmission rate controller 850 that determines the size of the padded null stream and informs the information on the main bit rates of the corresponding channel.
  • the transmission rate controller 850 may determine the main bit rates of the fast information channels provided from the FIC analyzing unit 845 and the size of the null stream padded in consideration of the encoding bit rates provided from the bit rate controller 716.
  • the present exemplary embodiment may optionally pad the null stream into the TS packetized video signal to be lower than the video main bit rate in consideration of the bits added from the outer coding later.
  • the null stream padding unit 810 may include an audio null padding unit, a video null padding unit, and a data null padding unit as shown in FIG. 3 in order to optionally pad the null stream into the encoded audio and data signals and the and the TS packetized vide signal, respectively.
  • the null stream padding uni 810 and the transmission rate controller 850 according to the present exemplary embodiment have substantially the same function and structure as the null stream padding unit 120a and the transmission rate controller 116 as shown in FIG. 2 and the detailed description thereof will be omitted.
  • the emergency broadcasting multiplexer 200a may further include a time information coder 815 that corrects time information on the video signals into which the null streams are padded among the TS packetized video signals passing through the null stream padding unit 810 and an outer coder 820 that performs the outer coding processing on the corrected or non-corrected video signal.
  • the time information correcting unit 815 and the outer coder 820 according to the exemplary embodiment have substantially the same function and structure as the time information correcting unit 140a and the outer coder 150a shown in FIG. 2 and therefore, the detailed description thereof will be omitted.
  • the emergency broadcasting multiplexer 200a may include an ETI frame generator 860, an ensemble multiplexer 865, and an ETI outputting unit 870, similar to the emergency broadcasting multiplexer 200a shown in FIG. 4 .
  • An RF receiving unit 825, an FIC analyzing unit 845, an ETI frame generator 840, and an ETI output unit 850 according to the present exemplary embodiment have substantially the same function and structure as the RF receiving unit 210, the FIC analyzing unit 220, the ETI frame generator 230, and the ETI output unit 250 shown in FIG. 4 and the detailed description thereof will be omitted.
  • the ensemble multiplexer 865 may receive the audio and data signals passing through the null stream padding unit and the outer coded video signals, respectively and multiplex theses signals into the ETI signal.
  • the audio and data signals passing through the null stream padding unit and the outer-coded video signal are each matched with the audio main bit rate, the data main bit rate, and the video main bit rate, the multiplexing can be achieved.
  • the present exemplary embodiment has the same effect as the exemplary embodiment of FIGS. 1 to 4 as well as simplifies the configuration of the emergency message generator to relieve the load of the functions of the emergency message generator.
  • FIG. 7 is an emergency message generator applied to the apparatus for relaying broadcasting according to the third exemplary embodiment
  • FIG. 8 is an emergency broadcasting multiplexer applied to the apparatus for relaying broadcasting according to the third exemplary embodiment of the present invention.
  • the apparatus for relaying broadcasting according to the third exemplary embodiment is different from the apparatus for relaying broadcasting according to the first exemplary embodiment in the following aspect.
  • the emergency message generator 100 includes an emergency contents reproducing unit 902 that receives and stores emergency signals for each emergency situation from a storage interface and a GUI/transmission rate controller 916 that receives the emergency generation related signals transmitted from an outer control center or users in a specific area and reproduces the emergency contents by the emergency contents reproducing unit 902.
  • the emergency service signals are input to the emergency message generator but in the third exemplary embodiment, the emergency message generator 100 receives the emergency signals to reproduce the emergency contents corresponding to the emergency signal by the emergency contents reproducing unit 902.
  • the emergency contents may be configured to include the corresponding audio signal, video signal, and data signal for each emergency situation.
  • the emergency contents are represented by the audio signal such as announcement matched with these situations and the data signal such as text, and the video signal for each situation.
  • the emergency contents generator 902 receives the new emergency situation related information from the storage interface as described above, thereby making it possible to store the contents for various emergency situations.
  • the emergency message generator 100 encodes the audio signal, the video signal, and the data signal configuring the emergency contents, respectively, with the audio bit rate, the video bit rate, and the data bit rate through the audio encoder 910, the video encoder 912, and the data encoder 914.
  • the audio signals are input to the video encoder 912 together with the video signal.
  • the video encoder 112 encodes them, thereby making it possible to provide the DMB services.
  • the audio bit rate, the video bit rate, and the data bit rate each may be set to the corresponding predetermined bit rates. In this case, the audio/video/data bit rates may be determined by the GUI/ transmission rate controller 916.
  • the GUI/transmission rate controller 916 may receive information related to first to third main service bit rates included in the fast information channels (FICs) of first to third broadcasting channels provided through an FIC analyzing units 1020 for each broadcasting and determine predetermined bit rates as a minimum main service bit rate or less among those.
  • FICs fast information channels
  • FIG. 9 is an emergency message generator applied to the apparatus for relaying broadcasting according to the fourth exemplary embodiment
  • FIG. 10 is an emergency broadcasting multiplexer applied to the apparatus for relaying broadcasting according to the fourth exemplary embodiment of the present invention.
  • the apparatus for relaying broadcasting according to the fourth exemplary embodiment is different from the apparatus for relaying broadcasting according to the second exemplary embodiment in the following aspect.
  • the emergency message generator 100 includes an emergency contents reproducing unit 1102 that receives and stores the emergency contents for each emergency situation from the storage interface and a GUI controller 1116 that receives the emergency generation related signals transmitted from the user in the outer control center or the user in the specific area and allows the emergency contents reproducing unit 1102 to reproduce the emergency contents.
  • the emergency contents generator 1102 has substantially the same function and structure as the emergency contents generator 902 shown in FIG. 7 and therefore, the detailed description thereof will be omitted.
  • the audio signal, the video signal, and the data signal configuring the emergency contents are encoded with the audio bit rate, the video bit rate, and the data bit rate through an audio encoder 1110, a video encoder 1112, and a data encoder 1114.
  • each of the audio/video/data bit rates may be set by being informed with the corresponding bit rates determined in a GUI controller 1116.
  • the GUI controller 1116 may determine the audio/video/data bit rates based on the fast channel information (FIC) for each broadcasting channel transmitted from the first to third emergency broadcasting multiplexers 200a.
  • the GUI controller 1116 may adopt the audio bit rates at the minimum audio main bit rates or less among the audio main bit rates of the main service channel included in the fast channel information.
  • the emergency broadcasting multiplexer 200a may include a transmission rate controller 1250 that determines the size of the padded null stream and informs a null stream padding unit 1210 of the information on the main bit rates of the corresponding channel.
  • the transmission rate controller 1250 may determined the main bit rates of the fast information channels provided from the FIC analyzing unit 1245 and the size of the null stream padded in consideration of the encoding bit rates provided from the GUI controller 1116.
  • the fourth exemplary embodiment may optionally pad the null stream into the TS packetized video signal to be lower than the video main bit rate in consideration of the bits added from the outer coding later.
  • the present exemplary embodiment is a method for providing emergency broadcasting for providing the emergency service signal by using the apparatus for relaying broadcasting that is the embodiments of FIGS. 1 to 4 .
  • FIG. 11 is a flow chart showing a method for providing emergency broadcasting for providing the emergency service signals using the apparatus for relaying emergency according to the exemplary embodiments of the present invention
  • FIG. 12 is a flow chart showing the correction process of time information and the outer coding process of the video signal.
  • the emergency service signal includes the audio signal, the video signal, and the data signal
  • the emergency service signal includes the audio signal, the video signal, and the data signal
  • relaying units 400a and 400b relay the regular broadcasting signals of the first and second broadcasting channels and the first and second emergency broadcasting multiplexers 200a and 200b receive the regular broadcasting signals and extract each of the sub-channel data having the information on the first and second fast information channels corresponding to each of the broadcasting channels and the main service channels for each broadcasting channel through the FIC analyzing units 220.
  • the fast information channels have the information on the first and second main service bit rate.
  • the first main service bit rate is determined based on the first audio main bit rate, the first video main bit rate, and the first data main bit rate that are allocated to the main service and the second main service bit rate may be determined based on the second audio main bit rate, the second video main bit rate, and the second data main bit rate that are allocated to the main service channel.
  • the first and second null stream padding units 120a and 120b may receive the information on the audio/video/data main bit rates of the corresponding broadcasting channel through the transmission rate controllers 116 (S1300).
  • the emergency service signals configured to include the audio signal, the video signal, and the data signal are generated and the emergency message generator 100 of the apparatus 10 for relaying broadcasting installed in the specific area may receive the emergency service signal (S1320).
  • the audio encoder 110, the video encoder 112, and the data encoder 114 may encode the audio/video data signals with the predetermined audio bit rate, video bit rate, and data bit rate, respectively (S1330).
  • the transmission rate controller 116 sets each of the audio/video/data bit rates to the audio main bit rates, the video main bit rates, and the data bit rates of the broadcasting channels or less and informs the audio encoder 110, the video encoder 112, and the data encoder 114 of it.
  • the audio bit rates may be the same as the minimum bit rates among the first and second audio main bit rates.
  • the first and second data main bit rates are set to the data bit rate or more that is set during the encoding process. Therefore, the data bit rates may also be the same as the minimum bit rates among the first and second data main bit rates.
  • the video bit rate may be smaller than the minimum bit rate among the first and second video main bit rates in consideration of the bits added during an outer coding process later.
  • the encoded video signals may be generated in the element stream (ES) packet type or the TS packet type.
  • the null stream is optionally inserted into the encoded emergency service signal and the signal processing may be made (S1340).
  • the emergency service signals are configured of the audio/video/data signals, the detailed process is shown in FIG. 12 .
  • the first and second TS packet units 118a and 118b converts the video signals having the E may convert and output the video signal having the ES packet type into the TS packetized video signal by using the identification information provided to the identification information analyzing units 214 (S1342).
  • the encoded video signals may be output as the TS packet type, not the ES packet type from the video encoder 112.
  • the video encoder 112 may receive the identification information from the identification information analyzing units 214 of the first to third emergency broadcasting multiplexers 200a, 200b, and 200c to be described below and output the TS packetized identification information corresponding to the predetermined video bit rates by using the identification information. Therefore, in the present exemplary embodiment, the TS packet units 118a, 118b, and 118c are omitted. Therefore, the TS packetized video signals are directly output through the video encoder 112.
  • the audio null stream unit 122 may generate signals that the null stream is optionally padded into the encoded audio signals to be matched with the first and second audio main bit rates. Similar to this, the data null stream unit 126 may generate signals that the null stream is optionally padded into the encoded data signal. However, the video null stream unit 124 may generate the signals that the null stream is optionally padded into the TS packetized video signals in consideration of the bits added during the outer coding process later (S1344). The size of the padded null stream is determined by the transmission rate controller 716 and may be informed to the audio null padding unit 122, the video null padding unit 124, and the data null padding unit 126.
  • the first and second time correcting correctors 130a and 130b may correct the time information on the video signal into which the null stream is inserted (S1346).
  • the first and second outer coders 140a and 140b may perform the outer coding process on the corrected video signal and the non-corrected video signal (S1348).
  • the time information correction and the outer coding are substantially the same as the operation described in the time information correctors 130a, 130b, and 130c and the outer coders 140a, 140b, and 140c described in the exemplary embodiment of FIGS. 1 to 4 .
  • the audio signals having the first and second audio main bit rates, the video signals having the first and second video main bit rates, and the data signals having the first and second data main bit rates are output.
  • the audio/video/data signals having the first audio/video/data main bit rates configure a first emergency message signal.
  • the second emergency message signals are also configured as the audio/video/data signals having the corresponding audio/video/data main bit rates.
  • the first and second emergency message stream units 150a and 150b may multiplex the audio/video/data signals having the main bit rates included in the first and second emergency message signals (S1350).
  • the ensemble multiplexers 240 may multiplex the multiplexed emergency message signals into the ETI signals including the fast information channel and the main service channel (S1360). Thereafter, the switching unit 500 stops the regular broadcasting signal of the broadcasting channel and may modulate the ETI signals for each broadcasting channel and transmit them to the user DMB terminal in the specific area.
  • the method for providing emergency broadcasting according to the present exemplary embodiment mainly describes the apparatus for relaying broadcasting according to the first exemplary embodiment, but in the case of the apparatus for relaying broadcasting according to the third exemplary embodiment, the method of the present exemplary embodiment is substantially the same as the above-mentioned method except for the following matters.
  • the emergency contents generator 902 of FIG. 7 reproduces the stored emergency contents corresponding to the emergency signal received from the outside, thereby making it possible to output the emergency service signals.
  • the present exemplary embodiment is a method for providing emergency broadcasting for providing the emergency service signal by using the apparatus for relaying broadcasting that is the embodiments of FIGS. 1 , 5 , and 6 .
  • FIG. 13 is a flow chart showing a method for providing emergency broadcasting for providing emergency service signals using the apparatus for relaying broadcasting according to another exemplary embodiment of the present invention.
  • the description of the present method describes, by way of example, the case where the broadcasting channels are two.
  • relaying units 400a and 400b relay the regular broadcasting signals of the first and second broadcasting channels and the first and second emergency broadcasting multiplexers 200a and 200b receive the regular broadcasting signals and extract the sub-channel data having the information on the first and second fast information channels corresponding to each of the broadcasting channels and the main service channels for each broadcasting channel through the FIC analyzing units 830.
  • the fast information channels may include the first audio main bit rate allocated to the main service channel of the first broadcasting channel, the information on the first video main bit rate and the first data main bit rates, the second audio main bit rate allocated to the main service channel of the second broadcasting channel, the second video main bit rate, and the second data main bit rate.
  • the first and second null stream padding units 810 may receive the information on the audio/video/data main bit rates of the corresponding broadcasting channel through the transmission rate controllers 835 (S1400).
  • the audio signal, the video signal, and the data signal that are related to the emergency are generated and the emergency message generator 100 of the apparatus 10 for relaying broadcasting installed in the specific area may receive the emergency service signal (S1420).
  • the audio encoder 710, the video encoder 712, and the data encoder 714 may encode the audio/video data signals with the predetermined audio bit rate, video bit rate, and data bit rate, respectively (S1430).
  • each of the audio/video/data bit rates is set to the audio main bit rates, the video main bit rates and the data bit rates or less of the broadcasting channels.
  • the encoded video signals is smaller than the minimum bit rates among the first and second video main bit rates in consideration of the bits added during the outer coding process later and may be generated in the element stream packet type or the TS packet type.
  • the process is substantially the same as step S930 and therefore, the detailed description thereof will be omitted.
  • the reserved frame generator 720 multiplexes the encoded audio/video/data signals, thereby making it possible to generate the reserved frame (S1440).
  • the reserved frame may be configured to include frame in service transport interface (STI), asynchronous serial interface (ASI), Internet protocol (IP), and ETI types.
  • the reserved frame distributing unit 730 may be distributed into the first and second emergency broadcasting multiplexers 200a and 200b, respectively (S1450).
  • the reserved frame analyzing units 805 of the first and second emergency broadcasting multiplexers 200a and 200b demultiplex the reserved frame, thereby making it possible to recover the encoded audio/video/data signals (S1460).
  • the TS packet units 840 converts the video signals having the E may convert and output the video signal having the ES packet type into the TS packetized video signal by using the identification information provided to the identification information analyzing units 835 (s1470).
  • This process is substantially the same as step S1342 and therefore, the detailed description thereof will be omitted.
  • the process may be omitted in the case where the encoded video signal is output in the TS packet type, not the ES packet type in the video encoder 712.
  • the video encoder 712 may receive the identification information from the identification information analyzing units 835 of the first to third emergency broadcasting multiplexers 200a, 200b, and 200c to be described below and output the TS packetized video signals corresponding to the predetermined video bit rates by using the identification information. Therefore, in the present exemplary embodiment, the TS packet units 118a, 118b, and 118c are omitted. Therefore, the TS packetized video signals are directly output through the video encoder 112.
  • the null stream padding parts 810 of the first and second emergency broadcasting multiplexers 200a and 200b may optionally pad the null stream into the encoded audio and data signals and the TS packetized video signals and process the signals (S1480).
  • the size of the padded null stream is determined by the transmission rate controller 850, which may be informed to the null stream padding units 810.
  • the transmission rate controller 850 may determine the size of the null stream to be padded, it may consider the main bit rates provided from the FIC analyzing unit 845 and the encoding bit rates provided to the bit rate controller 716. In addition to these processes, this process is substantially the same as step S1344 and therefore, the detailed description thereof will be omitted. Further, even in the exemplary embodiments, the correction of the time information and the outer coding processes for the TS packetized video signals may be progressed, which is substantially the same as steps S1346 and S1348.
  • the ensemble multiplexers 865 may multiplex the audio/video/data signals into which the null stream is optionally padded into the ETI signals including the fast information channel and the main service channel (S1490). Thereafter, the switching unit 500 stops the regular broadcasting signal of the broadcasting channel and may modulate the ETI signals for each broadcasting channel and transmit them to the user DMB terminal in the specific area.
  • the method for providing emergency broadcasting according to the present exemplary embodiment mainly describes the apparatus for relaying broadcasting according to the second exemplary embodiment, but in the case of the apparatus for relaying broadcasting according to the fourth exemplary embodiment, the method of the present exemplary embodiment is substantially the same as the above-mentioned method except for the following matters.
  • the emergency contents generator 1102 of FIG. 9 reproduces the stored emergency contents corresponding to the emergency signal received from the outside, thereby making it possible to output the emergency service signals.
  • FIG. 14 is an apparatus for relaying broadcasting according to another exemplary embodiments of the present invention used for the digital multimedia broadcasting (DMB) for providing the emergency service signals
  • FIG. 15 is an emergency message generator applied to the apparatus for relaying broadcasting according to the fifth exemplary embodiment of the present invention.
  • Modulators 1600a, 1600b, and 1600c, relaying units 1700a, 1700b, and 1700c, a switching unit 1800, and an RF transmitter 1830 are substantially the same as ones described in FIGS. 1 to 4 and therefore, the detailed description thereof will be omitted.
  • the configuration of the exemplary embodiments omits the module such as the emergency broadcasting multiplexers shown in the first exemplary embodiment to simplify is different from the first exemplary embodiment in that all the functions of the emergency broadcasting multiplexers are included in the emergency message generator 1500 in order to simplify the configuration of the apparatus for relaying broadcasting.
  • audio/video/data encoders 1512, 1514, and 1516 are substantially the same as components described in the first exemplary embodiment in view of functions and therefore, the difference with the first exemplary embodiment will be described mainly.
  • the emergency message generator 1500 generates the emergency message streams having the main service bit rates of various broadcasting channels by using the emergency service signals transmitted for each emergency situation and multiplexes them into the specifications of the corresponding broadcasting channel, which are in turn output to the modulators 1600a, 1600b, and 1600c.
  • the emergency message generator 1500 receives the broadcasting channels to determine the main service bit rate related information and the identification information, etc., for each broadcasting channel and may generate the frame having the ETI type by using the information.
  • the emergency message generator 1500 may include first to third ETI frame generators 1560a, 1560b, and 1560c that multiplex the audio/video/data signals having the above-mentioned main bit rates for each broadcasting channel based on the broadcasting channel information included in the sub-channel data and the fast information channels.
  • the first to third ETI frame generators 1560a, 1560b, and 1560c may receive the sub-channel data from the sub-channel analyzing unit 1504 and receive the fast information channels from the FIC analyzing unit 1506.
  • the first ETI frame generator 1560a may generate the first emergency message signal that the audio/video/data signals having the first audio/video/data main bit rates are multiplexed into the ETI frame type.
  • the second and third ETI frame generators 1560b and 1560c may generate the second and third emergency message signals similar to the configuration of the first emergency message signal.
  • the emergency message signals are input to the modulators 1600a, 1600b, and 1600c.
  • FIG. 16 is an emergency message generator applied to the apparatus for relaying broadcasting according to the sixth exemplary embodiment of the present invention.
  • the relaying units, the modulators, the switching unit and the RF transmitter according to the sixth exemplary embodiment are substantially the same as components described in the fifth exemplary embodiment and therefore, the detailed description thereof will be omitted.
  • the apparatus for relaying broadcasting according to the sixth exemplary embodiment is different from the apparatus for relaying broadcasting according to the fifth exemplary embodiment.
  • the emergency message generator 1500 includes an emergency contents reproducing unit 1910 that receives and stores emergency signals for each emergency situation from a storage interface and a GUI/transmission rate controller 1912 that receives the emergency generation related signals transmitted from an outer control center or users in a specific area and reproduces the emergency contents by the emergency contents reproducing unit 1910.
  • the emergency service signals are input to the emergency message generator 1500 but in the sixth exemplary embodiment, the emergency message generator 1500 receives the emergency signals to reproduce the emergency contents corresponding to the emergency signal by the emergency contents reproducing unit 1910.
  • the emergency message generator 1500 encodes the audio signal, the video signal, and the data signal configuring the emergency contents, respectively, with the audio bit rate, the video bit rate, and the data bit rate through the audio encoder 1914, the video encoder 1916, and the data encoder 1918.
  • the audio bit rate, the video bit rate, and the data bit rate each may be set to the corresponding predetermined bit rates.
  • the audio/video/data bit rates may be determined by the GUI/ transmission rate controller 1912.
  • the GUI/transmission rate controller 1912 may receive information related to first to third main service bit rates included in the fast information channels (FICs) of first to third broadcasting channels provided through FIC analyzing units 1906 for each broadcasting and determine predetermined bit rates as a minimum main service bit rate or less among those. Further, the GUI/transmission rate controller 1912 determines the size of the padded null stream and may inform the null stream padding units 1930a, 1930b, and 1930c of the information on the main bit rates of the corresponding channel.
  • FICs fast information channels
  • FIG. 17 is a block diagram showing an apparatus for relaying emergency broadcasting according to another exemplary embodiment of the present invention.
  • an apparatus 10 for relaying broadcasting capable of relaying emergency broadcasting basically serves to relay various channel broadcasting signals and when the emergency situation occurs, provides the emergency broadcasting to the terminals through various channels.
  • the apparatus 10 for relaying broadcasting may be installed in an area where buildings are concentrated and a shadow area such as mountains, tunnels, subway, etc., in order to improve the quality of broadcasting signals.
  • the apparatus 10 for relaying broadcasting relays the regular broadcasting through various channels at normal times and when the emergency occurs, provides the emergency broadcasting with the stream having the same type and specifications as each regular broadcasting of various channels, such that the terminal may not be subjected to a separate process in order to receive the emergency broadcasting.
  • the apparatus 10 for relaying broadcasting may include a plurality of relaying units 12, 14, and 16, the emergency message generator 100, a plurality of emergency broadcasting multiplexers 300_1, 300_2, and 300_3, a plurality of modulators 400_1, 400_2, and 400_3, the switching unit 500, and the RF transmitter 600.
  • the number of each of the plurality of relaying units 12, 14, and 16, the plurality of emergency broadcasting multiplexers 300_1, 300_2, and 300_3, and the plurality of modulators 400_1, 400_2, and 400_3 may correspond to the number of broadcasting channels.
  • the plurality of relaying units 12, 14, and 16 relays the normal broadcasting stream of each of the broadcasting channel.
  • the regular broadcasting stream that is relayed by each of the plurality of relaying units 12, 14, and 16 may have service bit rates for each stream.
  • Each of the relaying units 12, 14, and 16 may relay terrestrial-DMB (T-DMB) or satellite-DMB (S-DMB) signals and output them to the switching unit 500.
  • T-DMB terrestrial-DMB
  • S-DMB satellite-DMB
  • the emergency message generator 100 receives an audio source, a video source, an external input, and a data source, thereby generating and outputting the service stream for emergency broadcasting.
  • the audio source, the video source, the external input, and the data source may be signals for emergency broadcasting and the external input may be binary format for scenes (BIFS) data for emergency broadcasting.
  • the audio source may include, for example, a bit-sliced arithmetic coding (BASC) of an audio signal different first and second sampling frequencies.
  • the first sampling frequency may be 44.1 kHz and the second sampling frequency may be 48 kHz.
  • the emergency message generator 100 may support the audio signals of all the first and second sampling frequencies.
  • the emergency message generator 100 may multiplex the audio stream and the source stream of the first sampling frequency and multiplex the audio stream and the source stream of the second sampling frequency.
  • the source stream means one that at least one of the audio source, the video source, the video source for the visual radio, and the data source is encoded.
  • the service stream output by the emergency message generator 100 is a stream for emergency broadcasting, which may be the multiplexed video stream, audio stream, visual radio service stream, and BIFS stream.
  • Each of the plurality of emergency broadcasting multiplexers 300_1, 300_2, and 300_3 analyzes the service information of the regular broadcasting stream input through the antenna and multiplexes and outputs the service stream for emergency broadcasting to be matched with the specifications of the broadcasting channel. For example, the plurality of emergency broadcasting multiplexers 300_1, 300_2, and 300_3 receives the service streams output from the emergency message generator 100 to generate the emergency broadcasting service stream having the service bit rates corresponding to each of various broadcasting channels. In addition, each of the plurality of emergency broadcasting multiplexers 300_1, 300_2, and 300_3 may provide the service bit rate information of the broadcasting channel to the emergency message generator 100. The emergency message generator 100 may generate the emergency message streams by using the service bit rate information.
  • the plurality of emergency broadcasting multiplexers 300_1, 300_2, and 300_3 may optionally pad the null stream into the service stream for emergency broadcasting and output the emergency broadcasting service stream having the service bit rates.
  • the emergency message generator 100 may output the encoded emergency message stream at a bit rate of the minimum bit rate or less among various service bit rates.
  • the plurality of modulators 400_1, 400_2, and 400_3 may perform the coded orthogonal frequency division multiplexing (COFDM) modulation on each of the emergency broadcasting service streams.
  • COFDM coded orthogonal frequency division multiplexing
  • the switching unit 500 provides the regular broadcasting signals received at normal times to the user's terminals through the RF transmitter 600 and when the emergency broadcasting service stream is input, stops the receiving of the regular broadcasting signals and provides the emergency broadcasting service streams to the terminal through the RF transmitter 600.
  • the switching unit 500 may switch and output the regular broadcasting signals and the emergency broadcasting service streams by the control of a system controller 520 when the emergency situations occur.
  • the RF transmitter 600 can receive one of the regular broadcasting signal and the emergency broadcasting service streams for each channel as channel signals having an intermediate frequency (IF) band, for example, a system bandwidth of 1.536 MHz and send out them to terrestrial DMB channels having a bandwidth of 6 MHz.
  • IF intermediate frequency
  • the broadcasting channels are three and describe, by way of example, the case where the audio source, the video source, the external input, and the data source are input for emergency broadcasting and the external input includes the BIFS data.
  • the apparatus for relaying broadcasting may serve the regular broadcasting signals and the emergency broadcasting service streams to more than three channels and serve at least any one of the DMB service, the digital audio broadcasting service, and the digital video broadcasting service.
  • FIG. 18 is a block diagram showing the emergency message generator adoptable for the apparatus for relaying broadcasting according to one exemplary embodiment of the present invention
  • FIG. 19 is a block diagram showing the emergency broadcasting multiplexer adoptable for the apparatus for relaying broadcasting according to one exemplary embodiment.
  • the emergency message generator 100a includes the bit rate controller 110, the video service encoder 120a, the audio service encoder 160, the data service encoder 170, the ETI frame generator 180, and the ETI signal distributor 190.
  • the video service encoder 120a includes a BIFS coder 122, an advanced video coding (AVC) video coder 124, a first bit-sliced arithmetic coding (BASC) audio coder 126, a second BSAC audio coder 128, a visual radio reproducing unit 130a, first to fourth MPEG-4 on MPEG-2 TS multiplexers 140, 142, 144, and 146, and first to fourth TS re-multiplexers 150, 152, 154, and 156.
  • AVC advanced video coding
  • BASC bit-sliced arithmetic coding
  • the emergency message generator 100a supports various audio sampling frequencies.
  • the first and second BSAC audio coders 126 and 128 support two sampling frequencies 44.1 kHz and 48 kHz, respectively, such that the emergency message generator 100a generates the first and second video service streams and the first and second visual radio service stream corresponding to the 44.1 kHz and 48 kHz, respectively.
  • first and second audio streams of the elementary stream (ES) output from each of the BSAC audio coders 126 and 128 are each multiplexed by being subjected to the MPEG-4 on MPEG-2 process together with the video stream ('hereinafter, referred to a video ES') output from one AVC video coder 124 and are output as first and second video service streams.
  • the first and second video service streams which are the transport stream, may be generated by packetizing the ES packet by the MPEG-2.
  • first and second audio ES output from each of the BSAC audio coders 126 and 128 are each multiplexed by being subjected to the MPEG-4 on MPEG-2 process together with the video stream for the visual radio ('hereinafter, video ES for visual radio') output from the contents reproducing unit 130a for one visual radio and are output as the first and second visual radio service streams.
  • the first and second vide service stream and the multiplexed first and second visual radio service stream are configured of the ETI frame by the ensemble transport interface (ETI) frame generator 180 and are provided to each of the emergency broadcasting multiplexers 300_1, 300_2, and 300_3.
  • ETI ensemble transport interface
  • the bit rate controller 110 receives the information on the service bit rates of the first to third broadcasting channels (or ensemble) that are being currently broadcast from the each FIC analyzing unit (see 320 of FIG. 3 ) of the emergency broadcasting multiplexers 300_1, 300_2, and 300_3 and determine the predetermined bit rate of the minimum bit rate or less among the service bit rates as the reserved bit rate. For example, the bit rate determining unit 110 may determine the minimum bit rate among the service bit rates as the reserved bit rate.
  • an ensemble configuration of the first broadcasting channel has the first audio service bit rate of 128 Kbps, the first video service bit rate of 544 Kbps, and the first data service bit rate of 96 Kbps
  • an ensemble configuration of the second broadcasting channel has the second audio service bit rate of 96 Kbps, the second video service bit rate of 512 Kbps, and the second data service bit rate of 128 Kbps
  • an ensemble configuration of the third broadcasting channel has the third audio service bit rate of 192 Kbps, the third video service bit rate of 544 Kbps, and the third data service bit rate of 64 Kbps.
  • the bit rate controller 110 may determine 96 Kbps for the audio service as the reserved bit rate.
  • the bit rate controller 110 may determine 64 Kbps for the data service as the reserved bit rate. Further, the bit rate controller 110 may determine 512 Kbps for the video service as the reserved bit rate. Next, in the case of the vide service coding, the bit rate obtained by removing the bit rate increased by the outer coding in consideration of the bit rate increased after the outer coding is performed may be determined as the reserved bit rate.
  • the bit rate determining unit 110 provides the determined reserved bit rate to the BIFS coder 122, the AVC video coder 124, the first BSAC audio coder 126, the second BSAC audio coder 128, the visual radio reproducing unit 130a, the audio service encoder 160, and the data service encoder 170 that are included in the video service encoder 120a.
  • the BIFS coder 122 codes and schedules the binary format for scene (BIFS) data source input from the outside and outputs them to the first to fourth TS re-multiplexers 150, 152, 154, and 156 in the TS type.
  • the AVC video coder 124 receives the video sources and encodes them to be matched with the H.264/AVC standard to output the video ES. In this case, the AVC video coder 124 codes the video source according to the reserved bit rate provided from the bit rate controller 110. In order to support the first and second sampling frequencies (for example, 44.1 kHz and 48 kHz), the AVC video coder 124 transmits the video ES to the first and second MPEG-4 on MPEG-2 TS multiplexers 140 and 142, respectively.
  • the first and second sampling frequencies for example, 44.1 kHz and 48 kHz
  • the first and second BSAC audio coders 126 and 128 each receive the audio sources and encode them to be matched with two sampling frequencies according to, for example, ISO/IEC 14496-3 BSAC standard to output the second audio ES.
  • the first and second BSAC audio coders 126 and 128 codes the audio source according to the reserved bit rate provided from the bit rate controller 110.
  • the audio ES output from the first BSAC audio coder 126 is transmitted to the first and third MPEG-4 on MPEG-2 TS multiplexers 140 and 144, respectively.
  • the audio ES output from the second BSAC audio coder 128 is transmitted to the second and fourth MPEG-4 on MPEG-2 TS multiplexers 142 and 146, respectively.
  • the contents reproducing unit for the visual radio 130a outputs the emergency contents stored as the visual radio according to the reserved bit rate provided from the bit rate controller 110.
  • the emergency contents stream (hereinafter, referred to as 'video ES for visual radio') for the output visual radio is transmitted to each of the third and fourth MPEG-4 on MPEG-2 TS multiplexers 144 and 146, respectively.
  • Each of the first to fourth MPEG-4 on MPEG-2 TS multiplexers 140, 142, 144, and 146 includes two input to receive the video ES and the visual radio ES according to the first and second sampling frequencies of the audio source.
  • two video ESs output from the AVC video coder 124 are each mapped to the first audio ES (44.1 kHz) and the second audio ES (48 kHz), respectively, and are subjected to the MPEG-4 on MPEG-2 TS multiplexing process.
  • two video ESs for the visual radio output from the visual radio reproducing unit 130a are each mapped to the first audio ES (44.1 kHz) and the second audio ES (48 kHz), respectively, and are subjected to the MPEG-4 on MPEG-2 TS multiplexing process.
  • the TS output from the first to fourth MPEG-4 on MPEG-2 TS multiplexers 140, 142, 144, and 146 may be output in a 188 byte TS type that is not subjected to the outer coding.
  • the outer coding includes the Reed-Solomon (RS) coding and a convolutional interleaver.
  • the first to fourth TS re-multiplexers 150, 152, 154, and 156 re-multiplexes the input BIFS stream and the video ES and the video ES for the visual radio that are subjected to the MPEG-4 on MPEG-2 TS multiplexing process.
  • the first to fourth re-multiplexers 150, 152, 154, and 156 multiplexes and outputs the video and the visual radio service to enable the BIFS service for emergency broadcasting.
  • the audio service encoder 160 receives the audio source and codes the audio source according to the reserved bit rate provided from the bit rate controller 110 by a masking pattern adapted universal sub-band integrated coding and multiplexing (MUSICAM) scheme, high efficiency advanced audio coding version 2 (HE-AACV2), HE-AAC V2 BSAC scheme, and so on, thereby outputting the stream.
  • MUSICAM masking pattern adapted universal sub-band integrated coding and multiplexing
  • the data service encoder 170 encodes the data source according to the input data source.
  • the data service is called a service such as transport protocol expert group (TPEG), broadcast web site (BWS), and so on.
  • TPEG transport protocol expert group
  • BWS broadcast web site
  • the data service encoder 170 codes the data source according to the reserved bit rate provided from the bit rate controller 110 and outputs the stream.
  • the ETI frame generator 180 receives the first and second video service stream in the TS type and the first and second visual radio service stream output from the video service encoder 120a and the audio service stream and the data service stream from the audio service encoder 160 and the data service encoder 170, respectively, generates the ETI frame for these streams, is subjected to the ensemble multiplexing, and outputs the generated ETI frame in the ETI stream type through the hardware interface.
  • the ETI signal distributing unit 190 distributes the ETI stream input from the ETI frame generator 180 and outputs them to the first to third emergency broadcasting multiplexers 300_1, 300_2, and 300_3, respectively.
  • the emergency message generator 100a outputs the ETI stream to each of the emergency broadcasting multiplexers 300_1, 300_2, and 300_3 through the interface called the ETI
  • the exemplary embodiment of the present invention is not limited thereto and may use the interface in other types.
  • types such as asynchronous serial interface (ASI) and Internet protocol (IP) tunneling, and so on, may be used.
  • ASI asynchronous serial interface
  • IP Internet protocol
  • the emergency broadcasting multiplexer 300_1 will be described with reference to FIG. 19 . All the first to third emergency broadcasting multiplexers 300_1, 300_2, and 300_3 performs approximately the same functions and therefore, only the first emergency broadcasting multiplexer 300_1 will be described below.
  • the emergency broadcasting multiplexer 300_1 includes an RF receiver 310, an FIC analyzing unit 320, a sub-channel analyzing unit 330, an ETI frame generator 340, an outer decoder 350, a service stream analyzing unit 360, a transmission controller 370, an ETI frame analyzing unit 380, an identification information correcting unit 390, a null stream padding unit 400, a time information correcting unit 410, an outer coder 420, an ensemble multiplexer 430, and an ETI output unit 440.
  • each component will be described by being divided into the case where the emergency broadcasting multiplexer 300_1 relays the regular broadcasting and the case where it provides the emergency broadcasting. However, this is to help understanding of the description and each component is not operated by being divided into the case where relaying the regular broadcasting and the case where providing the emergency broadcast.
  • the RF receiver 310 After the RF receiver 310 receives the regular broadcasting signal from the antenna, it outputs the fast information channel (FIC) information to the FIC analyzing unit 320 and outputs each main service channel (MSC) data to the sub-channel analyzing unit 340.
  • FIC fast information channel
  • MSC main service channel
  • the RF receiver 310 receives the channel (ensemble) selected according to the control signal input from the transmission rate controller 370.
  • the RF receiver 310 transmits the ensemble streams of the received regular broadcasting to the sub-channel analyzing unit 330.
  • the ensemble stream of the regular broadcasting may include the regular video service stream, the regular visual radio service stream, the regular audio service stream, and the regular data service stream.
  • the FIC analyzing unit 320 analyzes the FIC signals received from the RF receiver 310 and informs the transmission rate controller 370 of each service information on the currently broadcast ensemble, that is, the information on each sub-channel and the bit rate information on each service.
  • the FIC analyzing unit 320 outputs all the analyzed FIC information to the ETI frame generator 340.
  • the sub-channel analyzing unit 330 analyzes the sub-channel for the ensemble stream received from the RF receiver 310.
  • the sub-channel analyzing unit 330 hands over the data of the sub-channel to the ETI frame generator 340 by the control signal received from the transmission rate controller 370 and outputs the sub-channel of the selected video and the visual radio service stream to the outer decoder 350.
  • the outer coder 350 is called the outer coding and video stream decoder.
  • the ETI frame generator 340 configures the ETI frame by using the received FIC information analyzed in the FIC analyzing unit 320 and outputs the configured ETI frame to the ensemble multiplexer 430.
  • the ensemble multiplexer 430 may output the corresponding sub-channel received from the sub-channel analyzing unit 330 by filling data in the allocated position in the main stream data (MST) according to the determination of the transmission rate controller 370.
  • the outer decoder 350 outer-decodes the input regular video and video radio service stream and outputs it to the stream analyzing unit 360.
  • the outer decoding includes the convolutional deinterleaver and error correction (Reed-Solomon) decoding.
  • the service stream analyzer 360 analyzes the regular video and the visual radio service stream input through the RF receiver 310 and parses the identification information and the sampling frequency information on the BSAC audio according to the analyzed result and transmits it to the transmission rate controller 370.
  • the identification information which is the video signal related information, may be various PID information and at the MPEG-2 level such as program association table packet identifier (PAT PID), program map table packet identifier (PMT PID), program clock reference packet identifier (PCR PID), video and audio related PID, OD, BIFS PID, etc. and various ES ID related information corresponding to the MPEG-4 level.
  • PAT PID program association table packet identifier
  • PMT PID program map table packet identifier
  • PCR PID program clock reference packet identifier
  • video and audio related PID OD, BIFS PID, etc.
  • various ES ID related information corresponding to the MPEG-4 level.
  • the BSAC sampling frequency it can parse and confirm a "De
  • the transmission rate controller 370 selects (or determine) the ensemble to be received and transmits it to the RF receiver 310.
  • the transmission rate controller 370 determines the service information of the selected ensemble through the analyzing results of the FIC analyzing unit 320.
  • the service information includes the information on the sub-channel and the bit rate information on the each service, etc.
  • the transmission rate controller 370 analyzes the sub-channel for the video and the visual radio service in the sub-channel analyzing unit 330.
  • the transmission rate controller 370 grasps the identification information and the BSAC sampling frequency information in the service stream analyzing unit 360 and receives the grasped information.
  • the transmission rate controller 370 transmits the selected service information to the ETI frame analyzing unit 380 and controls the ETI frame analyzing unit 380 to select and receive the first and second video service streams output from the emergency message generator 100 and the video and visual radio service stream conforming to the grasped BSAC sampling frequency (for example, any one of 44.1 kHz and 48 kHz) among the first and second video service stream output from the emergency message generator 100 and the first and second visual radio service stream.
  • the transmission rate controller 370 controls the identification information correcting unit 390 to inform of the identification information correcting unit 390 the identification information analyzed in the service stream analyzing unit 360 and correct the identification information of the identification information of the video and the visual radio stream input to the identification information correcting unit 390 to be identical with the informed identification information.
  • the transmission rate controller 370 compares and calculates each of the service bit rates in the current ensemble based on the reserved bit rate information received from the bit rate controller 100 of the emergency message generator 100a to inform of the null stream padding unit 400 the padding information of the null stream filled for each service stream.
  • the ETI frame analyzing unit 380 analyzes the services of the each of the sub-channel in the first and second video service stream and the first and second visual radio service stream received from the emergency message generator 100a and selects the video service stream and the visual radio service stream conforming to the selected sampling frequency information according to the control of the transmission rate controller 370 and outputs it to the identification information correcting unit 390 and outputs the audio and data service stream to the null stream padding unit 400.
  • the identification information correcting unit 390 corrects and outputs the identification information in the input video and visual radio service stream to be identical with the identification information informed from the transmission rate controller 370.
  • the null stream padding unit 400 optionally pads the null stream into the video and visual radio service stream and the audio and data service stream according to the null stream padding information and then outputs it.
  • the null stream padding unit 400 pads the null stream to be matched with the size but may pad the null packet in consideration of the size of the stream increased during the outer process of the later stage.
  • the configuration of the ensemble of the first broadcasting channel has the first video service bit rate of 544 kbps, the first audio service bit rate of 123 Kbps, and the first data service bit rat of 96 Kbps.
  • the video service encoder 120a performs the coding at the reserved bit rate of 512 Kbps
  • the audio service encoder 160 performs the coding at the reserved bit rate of 96 Kbps
  • the data service encoder 170 performs the coding at the reserved bit rate of 64 Kbps.
  • the null stream padding unit 400 pads the null stream of 32 Kbps into the video and the visual service stream, the null stream of 32 Kbps into the audio service stream, and the null stream of 32 Kbps into the data service stream.
  • the bit rate of the video service encoder becomes a value including the bit rate generated at the time of the outer coding.
  • the time information correcting unit 410 receives the video and the visual radio service stream and the audio and data service streams from the null stream padding unit 400 and re-corrects and outputs the time information varied due to the padding of the null packet. For example, when correcting the time information on the TS packet, it corrects the time information based on the padding passage time of the null stream, etc., so as to have continuity without stopping program clock reference (PCR), object clock reference (OCR), decoding time stamp (DTS), composition time stamp (CTS), presentation time stamp (PTS), and continuity_counter value of the TS packet, etc., so that the time information of the stream is not changed at the time of generating the TS packets filled with the null packets.
  • PCR program clock reference
  • OCR object clock reference
  • DTS decoding time stamp
  • CTS composition time stamp
  • PTS presentation time stamp
  • continuity_counter value of the TS packet etc.
  • the receiving module and the terminal do not decode the video service stream as it is, thereby causing the phenomenon that the screen is continuously broken or the terminal is not operated.
  • the outer coder 420 outer-codes the 188 byte TS packet input from the time information correcting unit 410 to output the video service stream in the TS packet type of 204 bytes. Similar to the process of outputting the video service stream, the visual radio service stream is also output through the outer coder 420.
  • the outer coding includes the error correction coding and the convolution interleaving process.
  • the error correction coding may use, for example, a Reed-Solomon scheme.
  • the video or the visual radio service signal being subjected to the outer coding withstand against the error occurring during the wireless transmission process.
  • the ensemble multiplexer 430 multiplexes and outputs the emergency message input through the ETI frame analyzing unit 380 on the ETI frame input through the ETI frame generator 340.
  • the ensemble multiplexer 430 keeps all the portions of the ETI frame received from the ETI frame generator 340 like the case of the regular broadcasting but removes the FIC data among the main stream data (MST) portions of the ETI frame, that is, is maintained to be identical with the FIC of the existing broadcasting and changes and multiplexes them into the stream for the video and the visual radio service stream and the audio and data service stream, etc. that are generated for the emergency broadcasting from the emergency message generator 100a.
  • the bit rate for each service stream is controlled to be identical with the bit rate of each of the service bit stream of the regular broadcasting.
  • the ETI output unit 440 outputs the ETI frame received from the ensemble emergency broadcasting multiplexer 430 to the modulator 400_1 through the hardware interface in the ETI stream type.
  • each of the plurality of emergency broadcasting multiplexers 300_1, 300_2, and 300_3 may be merged in the emergency message generator 100a in an integrated form or the single module form.
  • the emergency message generator 100a and the plurality of emergency broadcasting multiplexers 300_1, 300_2, and 300_3 may be implemented in an independent module form or integrally implemented in a single module form.
  • FIG. 20 is a block diagram showing the emergency message generator adoptable for the apparatus for relaying broadcasting according to another exemplary embodiment of the present invention.
  • components of substantially performing the same functions as components shown in FIG. 18 are denoted by the same reference numerals and therefore, the detailed description of the corresponding components will be omitted.
  • the present exemplary embodiment is configured to enable the AVC visual radio coder 130b to receive the video source from the outside and code the video source in real time according to the reserved bit rate provided from the bit rate controller 110 and output the vide ES for the visual radio without the contents reproducing unit 130a for the visual radio outputting the previously stored emergency contents for visual radio at the reserved bit rate.
  • FIG. 21 is a block diagram showing the emergency message generator adoptable for the apparatus for relaying broadcasting according to another exemplary embodiment of the present invention.
  • components of substantially performing the same functions as components shown in FIG. 18 are denoted by the same reference numerals and therefore, the detailed description of the corresponding components will be omitted.
  • the output of the BIFS coder 122 is not input to the TS re-multiplexer 150, 152, 154, and 156 but is input to first to fourth MPEG-4 on MPEG-2 TS multiplexers 140c, 142c, 144c, and 146c.
  • each of the MPEG-4 on MPEG-2 TS multiplexers 140c, 142c, 144c, and 146c multiplexes the BIFS stream input to the object descriptor (OD)/BIFS generator 210 with the video ES and the video ES for the visual radio at the MPEG-4 level and outputs it as the OD/BIFS stream.
  • the first to fourth MPEG-4 on MPEG-2 TS multiplexers 140c, 142c, 144c, and 146c will be described below with reference to FIG. 7 .
  • FIG. 22 is a block diagram showing the emergency message generator adoptable for the apparatus for relaying broadcasting according to another exemplary embodiment of the present invention.
  • components of substantially performing the same functions as components shown in FIGS. 20 and 21 are denoted by the same reference numerals and therefore, the detailed description of the corresponding components will be omitted.
  • the present exemplary embodiment is configured to enable the contents reproducing unit 130a for the visual radio to code the previously stored visual radio source not to be output in the video ES type and enable the AVC visual radio coder 130b to receive the video source from the outside, code the video source in real time according to the reserved bit rate provided from the bit rate controller 110, and output the video ES.
  • the encoded video ES or the video ES for the visual radio may be outputted as the TS type from each of the coders 124 and 130b, not the ES type.
  • each coder 124 and 130b may be configured to output the TS packetized video ES or the video ES for the visual radio corresponding to the predetermined bit rate by using the identification information received from the FIC analyzing unit of the emergency broadcasting multiplexer.
  • the type may be considered as the type that the MPEG-4 on MPEG-2 TS multiplexers 140, 142, 144, and 146 or all the MPEG-4 on MPEG-2 TS multiplexers 140, 142, 144, and 146 and the TS re-multiplexers 150, 152, 154, and 156 are integrally coupled to each coder 124 and 130b.
  • FIG. 23 is a schematic block diagram of the MPEG-4 on MPEG-2 TS multiplexer adoptable for the emergency message generator of FIGS. 21 and 22 .
  • the OD/BIFS generator 210 When the OD/BIFS generator 210 is mounted in the video service encoder of FIGS. 2 and 3 , the OD/BIFS stream is generated according to IS0/IEC 1449601 standard and is output to the SL packetizing unit 230. In addition, when the OD/BIFS generator 210 is used in the video service encoder of FIGS. 4 and 5 , it receives the stream output from the BIFS coding and scheduler and generates the OD/BIFS stream and then, may be output to the SL packetizing unit 230.
  • the IOD generator 220 generates the initial object descriptor (IOD) stream according to the ISO/IEC 14496-1 standard and outputs it to the SL packetizing unit 230.
  • the SL packetizing unit 230 generates and outputs the sync later (SL) packet, which is the synchronization packet, from each media stream input from the AVC video coder, the first or second audio coder, and the OD/BIFS generator 210 according to the 14496-1 standard.
  • SL sync later
  • the PES packetizing unit 240 packetizes and outputs the SL packet input from the SL packetizing unit 230 as the packetized elementary stream (PES) according to the ISO/IEC 13818-1 standard.
  • PES packetized elementary stream
  • the section generator 250 generates and outputs the input OD/BIFS SL packet and IOD stream as the 14496 section and the program specific information (PSI) section according to the ISO/IEC 13818-1 standard.
  • PSI program specific information
  • the TS multiplexer 260 multiplexes and outputs the section and the PES packets input from the PES packetized unit 240 and the section generator 250 into the MPEG-2 transport stream (TS).
  • the output of the TS multiplexer 260 may be input to each of the first to fourth re-multiplexers (see FIGS. 18 and 19 ) or may be input to the ETI frame generator (see FIGS. 20 AND 21).
  • the MPEG-4 on MPEG-2 TS multiplexer 140c performs the SL packetizing, the PES packetizing, and the TS multiplexing process on the emergency message signals for each channel of the corresponding broadcasting, thereby making it possible to output it as the TS packetized emergency broadcasting service signal of 188 bytes.
  • the above-mentioned MPEG-ON MPEG-2 TS multiplexer 140c represents the first to fourth MPEG-4 on MPEG-2 TS multiplexers 140c, 142c, 144c, and 146c of FIGS. 20 and 21 including substantially the same structure and function.
  • the above-mentioned MPEG-4 on MPEG-2 TS multiplexer 140c may represent the first to fourth MPEG-4 on MPEG-2 TS multiplexers 140, 142, 144, and 146 of FIGS. of FIGS. 18 and 19 including substantially the same structure and function except that the OD/BIFS generator 210 receives the stream output from the BIFS coding and scheduler 122.
  • the present invention encodes the emergency service signals in the specific areas with a predetermined bit rate by using the single encoder in the apparatus for relaying broadcasting and selectively pads the null streams to match the main service bit rates included in each of the various channels of the digital multimedia broadcasting.
  • the configuration of the apparatus for relaying broadcasting can be simplified since it does not need to include the encoders for each broadcasting channel.
  • the emergency service signals into which the null streams are padded are multiplexed into the various broadcasting specifications to serve the emergency broadcasting, such that the emergency related broadcasting of the specific areas can be provided to several broadcasting channels of the users in the corresponding areas.
  • the present invention encodes the emergency situations in the specific areas with a predetermined bit rate by using the single encoder in the apparatus for relaying broadcasting and selectively pads the null streams to match the main service bit rates included in each of the various channels the digital multimedia broadcasting, thereby making it possible to provide the emergency messages to various channels.
  • the configuration of the apparatus for relaying broadcasting can be simplified since it does not need to include the encoders for each broadcasting channel.
  • the emergency contents into which the null streams are padded are multiplexed into the various broadcasting specifications to simultaneously serve the emergency broadcasting of the corresponding areas to various viewers in the specific areas that watch different broadcasting channels.
  • the present invention supports two audio sampling frequencies in the videos and the visual radio service that are being compatibly used in the broadcaster to transmit the emergency alarm broadcasting contents to the current receivable broadcasting channels of the receiving terminals of the viewers when the emergency situations occur in the tunnel or the underground space, etc., such that the emergency situations can be rapidly and accurately transmitted to the viewers in the corresponding areas without performing the separate operations on the receiving terminals of the viewers

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  • Engineering & Computer Science (AREA)
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  • Business, Economics & Management (AREA)
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  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
EP10193080.8A 2009-11-30 2010-11-30 Relais de diffusion d'un signal de service d'urgence Withdrawn EP2328287A3 (fr)

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KR1020100045983A KR101420188B1 (ko) 2010-05-17 2010-05-17 재난방송 제공 방법, 방송 중계 장치, 다중화기 및 다중화 방법

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2854314A1 (fr) * 2013-09-06 2015-04-01 Sven Mulka Procédé et dispositif pour l'insertion de messages d'alarme dans un ensemble DAB dans un tunnel
JP2015126328A (ja) * 2013-12-26 2015-07-06 株式会社Ｊｖｃケンウッド デジタル放送装置及びデジタル放送方法
WO2018003025A1 (fr) * 2016-06-29 2018-01-04 株式会社タナビキ Station de transmission à diffusion numérique terrestre et procédé de diffusion numérique
US20180332439A1 (en) * 2015-11-19 2018-11-15 39Degrees C Inc. Method, device, and non-transitory computer-readable recording medium for supporting relay broadcasting using mobile device
CN112350792A (zh) * 2020-09-27 2021-02-09 福建新大陆通信科技股份有限公司 一种应急广播数据转发复用方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5917830A (en) * 1996-10-18 1999-06-29 General Instrument Corporation Splicing compressed packetized digital video streams
WO2006035242A2 (fr) * 2004-09-30 2006-04-06 Radioscape Limited Systeme de transmission de messages d'urgence et procede associe
KR100789365B1 (ko) * 2004-12-10 2007-12-28 한국전자통신연구원 지상파 디엠비 신호의 스플라이싱 장치 및 그 방법
JP2008205979A (ja) * 2007-02-22 2008-09-04 Hitachi Ltd 放送データ変換装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2854314A1 (fr) * 2013-09-06 2015-04-01 Sven Mulka Procédé et dispositif pour l'insertion de messages d'alarme dans un ensemble DAB dans un tunnel
EP3627729A1 (fr) * 2013-09-06 2020-03-25 Sven Mulka Procédé et dispositif d'affichage des messages d'alarme dans un ensemble dab à l'intérieur d'un tunnel
JP2015126328A (ja) * 2013-12-26 2015-07-06 株式会社Ｊｖｃケンウッド デジタル放送装置及びデジタル放送方法
US20180332439A1 (en) * 2015-11-19 2018-11-15 39Degrees C Inc. Method, device, and non-transitory computer-readable recording medium for supporting relay broadcasting using mobile device
US10616724B2 (en) * 2015-11-19 2020-04-07 39Degrees C Inc. Method, device, and non-transitory computer-readable recording medium for supporting relay broadcasting using mobile device
WO2018003025A1 (fr) * 2016-06-29 2018-01-04 株式会社タナビキ Station de transmission à diffusion numérique terrestre et procédé de diffusion numérique
CN112350792A (zh) * 2020-09-27 2021-02-09 福建新大陆通信科技股份有限公司 一种应急广播数据转发复用方法
CN112350792B (zh) * 2020-09-27 2023-05-30 福建新大陆通信科技股份有限公司 一种应急广播数据转发复用方法

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