EP2008451A1 - Systeme de diffusion numerique et procede de traitement de donnees associe - Google Patents

Systeme de diffusion numerique et procede de traitement de donnees associe

Info

Publication number
EP2008451A1
EP2008451A1 EP07745728A EP07745728A EP2008451A1 EP 2008451 A1 EP2008451 A1 EP 2008451A1 EP 07745728 A EP07745728 A EP 07745728A EP 07745728 A EP07745728 A EP 07745728A EP 2008451 A1 EP2008451 A1 EP 2008451A1
Authority
EP
European Patent Office
Prior art keywords
packet
packets
start information
frame
received
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Withdrawn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
EP07745728A
Other languages
German (de)
English (en)
Other versions
EP2008451A4 (fr
Inventor
Yong-Sik Kwon
Jung-Pil Yu
Eui-Jun Park
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US11/416,258 external-priority patent/US7876750B2/en
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to EP09173540A priority Critical patent/EP2159946A3/fr
Priority to EP09173534A priority patent/EP2160034A3/fr
Publication of EP2008451A1 publication Critical patent/EP2008451A1/fr
Publication of EP2008451A4 publication Critical patent/EP2008451A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/2368Multiplexing of audio and video streams
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H20/00Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/18Arrangements for synchronising broadcast or distribution via plural systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H20/00Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65Arrangements characterised by transmission systems for broadcast
    • H04H20/67Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0041Arrangements at the transmitter end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/23608Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4341Demultiplexing of audio and video streams
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4344Remultiplexing of multiplex streams, e.g. by modifying time stamps or remapping the packet identifiers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H20/00Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/02Arrangements for relaying broadcast information
    • H04H20/06Arrangements for relaying broadcast information among broadcast stations
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H60/00Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/02Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information
    • H04H60/07Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092Error control systems characterised by the topology of the transmission link
    • H04L2001/0093Point-to-multipoint
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements

Definitions

  • the present invention relates to a digital broadcasting system and a data processing method thereof, and more particularly, to a digital broadcasting system and a data processing method which can reduce waste of frequency resources, via efficient transmission and reception of packets.
  • TV television
  • DTV digital television
  • FIG. 1 illustrates a typical digital TV broadcasting system and a process of transmitting a TV program from a broadcasting station to a base station.
  • a digital TV broadcasting system 100 includes at least a broadcasting station 110 and multiple base stations 120A- 120N arranged within different coverage areas.
  • the broadcasting station 110 generates broadcasting a signal in the form of packets by compressing and packetizing video and audio signals obtained through, for example, a camera and a microphone, respectively, using a modulator (not shown), and transmits the broadcasting packets, via a transmission channel (e.g., optical cables or wireless).
  • the respective base stations 120A- 120N which may be located in different parts of the country, are arranged to receive the broadcast signal for processing accordingly.
  • Each base station is typically provided with a transceiver (i.e., a transmitter and a receiver) capable of transmitting and receiving the broadcast signal.
  • broadcast packets are sequentially transmitted one by one.
  • a transmitter which is installed in a respective base station, processes the broadcast packet transmitted from the broadcasting station 110 in the unit of a frame, and transmits the processed broadcast signal to broadcasting receivers, such as TV receivers that belong to a predetermined communication area.
  • broadcasting receivers such as TV receivers that belong to a predetermined communication area.
  • the respective base stations 120A- 120N have fixed transmission ranges in which broadcast signals can be transmitted, respectively.
  • Such broadcast packets or frames may be provided in diverse forms.
  • the transmitter forms the frames by successively accumulating the transmitted broadcast packets.
  • the transmitter cannot receive the broadcast packets, even though the broadcast packets are transmitted from the broadcasting station 110.
  • the [0001] transmitter is turned “ON"
  • frames are formed by accumulating the received broadcast packets.
  • the respective base stations 120A- 120N may receive broadcast packets in different orders depending on the "ON/OFF" state of the transmitters, and in this case, the broadcast packets included in one frame may differ for the respective base stations 120A- 120N.
  • the frames formed through the respective base stations 120A- 120N are not identical. Accordingly, in an area where the same broadcast signals are received from two or more base stations 120A- 120N, interference may occur between the broadcast signals. As a result, the broadcast signal may not to be received at a broadcast receiver.
  • the respective base stations 120A- 120N generally use separate channels, i.e., different frequencies.
  • a method of preventing the overlapping of communication ranges of the respective base stations 120A- 120N has been used in order to prevent the broadcast signals from being received from two or more base stations 120A- 120N.
  • frequency resources can be wasted.
  • areas where broadcast receivers cannot receive any of the broadcast signals from the respective base stations 120A- 120N may occur inevitably.
  • Several aspects and example embodiments of the present invention provide a digital broadcasting system and a data processing method thereof, which can reduce the waste of frequency resources and conform to a user's convenience by transmitting/receiving packets using packet start information.
  • an apparatus for generating a transport stream which comprises a packet generator to generate a plurality of packets; a counter arranged to count the number of packets generated and provide a count value; and a controller arranged to determine whether the count value reaches a predetermined number of packets, to insert packet start information into the packets, and to transmit the packets having the packet start information inserted therein in a transport stream.
  • a data processing method for a transport stream generation apparatus which comprises generating a plurality of packets by compressing video and audio signals; counting the number of packets generated and providing a count value; and determining whether the count value reaches a predetermined number of packets, inserting packet start information into the packets according to the count value, and transmitting the packets having the packet start information inserted therein in a transport stream.
  • a digital broadcast transmission apparatus which comprises a sync setting unit arranged to set a clock synchronization for the transmission of a transport stream in the form of packets; and a frame generator arranged to make a determination of whether packet start information that indicates a start packet of a frame has been inserted into a next packet subsequent to the packet among a plurality of packets received, and generate a frame based on the determination.
  • a data processing method for a digital broadcast transmission apparatus which comprises setting a clock synchronization for the transmission of a transport stream in the form of packets; and arranging to make a determination of whether packet start information that indicates a start packet of a frame has been inserted into a next packet subsequent to the packet among a plurality of packets received, and generating a frame based on the determination.
  • a digital broadcasting system which comprises a multiplexer for generating a plurality of packets by compressing video and audio signals and having information related to the order of the plurality of packets; and a digital broadcast transmitter for receiving the plurality of packets and the information related to the order of the plurality of packets from the multiplexer, and processing the plurality of packets according to the order.
  • a data processing method for a digital broadcasting system which comprises generating a plurality of packets by compressing video and audio signals; generating information related to the order of the plurality of packets; and transmitting the plurality of packets and the information related to the order of the plurality of packets to a transmitter.
  • frequency resources can be conserved and waste can be eliminated, if not reduced, by adding packet start information to a packet to be transmitted in a transmitter, and by extracting and processing the packet start information from the received packet in a receiver.
  • a user's convenience can be enhanced by receiving the same broadcast signal through the same channel number for each locality.
  • ASIC application specific integrated circuit
  • software modules can be written, via a variety of software languages, including C, C++, Java, Visual Basic, and many others.
  • These software modules may include data and instructions which can also be stored on one or more machine-readable storage media, such as dynamic or static random access memories (DRAMs or SRAMs), erasable and programmable read-only memories (EPROMs), electrically erasable and programmable read-only memories (EEPROMs) and flash memories; magnetic disks such as fixed, floppy and removable disks; other magnetic media including tape; and optical media such as compact discs (CDs) or digital video discs (DVDs). Instructions of the software routines or modules may also be loaded or transported into the wireless cards or any computing devices on the wireless network in one of many different ways.
  • DRAMs or SRAMs dynamic or static random access memories
  • EPROMs erasable and programmable read-only memories
  • EEPROMs electrically erasable and programmable read-only memories
  • flash memories such as fixed, floppy and removable disks; other magnetic media including tape; and optical media such as compact discs (CDs) or digital video discs (DVDs).
  • code segments including instructions stored on floppy discs, CD or DVD media, a hard disk, or transported through a network interface card, modem, or other interface device may be loaded into the system and executed as corresponding software routines or modules.
  • data signals that are embodied as carrier waves may communicate the code segments, including instructions, to the network node or element.
  • carrier waves may be in the form of electrical, opticalacoustical, electromagnetic, or other types of signals.
  • FIG. 1 illustrates a typical digital TV broadcasting system and a process of transferring a TV program from a broadcast station to a base station;
  • FIG. 2 is a block diagram an example transport stream (TS) construction unit according to an embodiment of the present invention
  • FIG. 3 illustrates the structure of an example dual transport stream according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a method for operating a multiplexer according to an embodiment of the present invention
  • FIG. 5 illustrates an example data frame in accordance with an ATSC VSB type of a digital broadcasting system according to an embodiment of the present invention
  • FIG. 6 is a block diagram illustrating the construction of an example digital broadcast transmitter according to an embodiment of the present invention.
  • FIG. 7 is a flowchart of a method for operating a digital broadcast transmitter according to an embodiment of the present invention. Best Mode for Carrying Out the Invention
  • a broadcasting station is provided with a multiplexer to broadcast packets, and base stations are provided with respective transceivers (i.e., transmitters and receivers).
  • transceivers i.e., transmitters and receivers.
  • a dual transport stream In a terrestrial-wave digital television (DTV) broadcasting system in the U.S., in accordance with an ATSC (Advanced Television Systems Committee) VSB (Vestigial Side Band) standard, a dual transport stream (TS) can be used.
  • a dual transport stream includes a normal stream and a turbo stream.
  • the TS construction unit 200 includes an RS (Reed-Solomon) encoder 210, a place holder maker 220, an interleaver, and a TS multiplexer 240.
  • RS Read-Solomon
  • the RS encoder 210 and the interleaver 230 can be omitted, and the positions of the RS encoder 210 and the interleaver 230 can be changed.
  • a normal stream and a turbo stream are received.
  • the normal stream is directly input to the TS multiplexer
  • the turbo stream is input to the TS multiplexer 240 through the RS encoder 210, the place holder maker 220, and the interleaver 230.
  • the RS encoder adds a parity to the turbo stream
  • the place holder maker 220 generates a parity insertion region for inserting the parity to be added into the turbo stream.
  • the interleaver 230 interleaves the turbo stream received from the place holder maker 220.
  • the TS multiplexer 240 multiplexes the normal stream and the turbo stream to construct a dual transport stream (TS). Then, the TS multiplexer 240 generates the broadcast packets by packetizing the constructed dual transport stream (TS).
  • the TS multiplexer 240 includes a packet generator 241, a counter 243, and an information controller 245.
  • the packet generator 241 forms the dual transport stream (TS) by combining the normal stream and the turbo stream, and the dual transport stream (TS) is packaged in the form of packets.
  • FIG. 3 illustrates the structure of an example dual transport stream (TS) according to an embodiment of the present invention.
  • TS dual transport stream
  • a turbo stream has 78 packets which is inserted into packets of 312 segments of one field of a dual transport stream.
  • the dual transport stream (TS) is constructed so that four packets, which include one packet (188 bytes) of the turbo stream and three packets (188 bytes) of the normal stream, are repeatedly arranged in the ratio of 1:3.
  • the turbo stream of 70 packets is inserted into 312 segments of the dual transport stream (TS)
  • the dual transport stream (TS) is constructed so that four packets, which include one packet (188 bytes) of the turbo stream and three packets (188 bytes) of the normal stream (in the ratio of 1:3), are repeated for 70 times.
  • VFIP VVB Frame Initialization Packet
  • the information controller 245 adds the packet start information to a header of the packet, which is composed of 3 bytes, and transmits the packet with the packet start information to the base stations (as shown, for example, in FIG. 1).
  • the packet start information is added to a packet identifier (PID) region of the header.
  • PID packet identifier
  • the packet start information represents information indicating that the next packet of the packet to which the packet start information has been added is the first packet that forms the frame.
  • the information controller 245 transmits the dual transport stream packet formed by the packet generator 241 as it is. That is, the information controller 245 does not add the packet start information to the packet, when the count result is not equal to the predetermined number of packets, and transmits the dual transport stream packet outputted from the packet generator 241 to the base stations (as shown, for example, in FIG. 1).
  • FIG. 4 is a flowchart provided to explain a method for operating a multiplexer according to an embodiment of the present invention
  • FIG. 5 illustrates an example frame formed by an ATSC VSB type transmitter in a digital broadcasting system according to an embodiment of the present invention.
  • the packet generator 241 included in the TS multiplexer 240 generates a dual transport stream (TS) by combining a normal stream and a turbo stream, and in this case, the dual transport stream (TS) is in the form of packets at operation S410. That is, the packet generator 241 generates the dual transport stream (TS) by multiplexing the input normal stream and turbo stream, and provides the dual transfer stream (TS) in the form of packets.
  • the counter 243 counts the dual transfer stream packets, and outputs the count result at operation S420.
  • the information controller 245 determines whether the count result reaches a predetermined number of packets that constitute a plurality of frames predetermined according to the standard of the digital broadcasting system at operation S430.
  • the information controller 245 adds packet start information to a header of the packet at operation S440.
  • This packet to which the packet start information has been added is called the VFIP (VSB Frame Initialization Packet).
  • the packet start information represents information indicating that the next packet of the packet to which the packet start information has been added is the first packet that constitutes the frame.
  • each frame of a packet is composed of two fields, and each field is composed of one field sync segment that is the first segment, and 312 data segments.
  • the information controller 345 adds the packet start information to the header of the packet when the count result at operation S420 reaches a predetermined number, such as 12,480.
  • 12,480 represents the number of packets that corresponds to 20 frames except for the field sync segment.
  • one frame except for the field sync segment is composed of 624 packets
  • the information controller 345 adds the packet start information, which indicates that the next packet (i.e., 12,481st packet) is the start packet constituting the next frame, to the header of the last packet, i.e., 12,480th packet, of the 20th frame. Then, the information controller 245 included in the TS multiplexer 240, as shown in FIG. 2, transmits the packet to the base stations (as shown, for example, in FIG. 1) at operation S450.
  • the information controller 245 transmits the VFIP that is the packet to which the packet start information has been added at operation S440 to the base stations. If the count result has not reached the predetermined number of packets, the information controller 245 included in the TS multiplexer 240 transmits the dual transport stream packet generated by the packet generator 241 as it is. That is, with respect to the packet in which the count result has not reached the predetermined number of packets, i.e., the packet that is not the VFIP, the information controller 245 included in the TS multiplexer 240 transmits the dual transport stream packet outputted at operation S410 to the base stations (as shown, for example, in FIG. 1).
  • the information controller 245 for adding packet start information to a header of the packet, or for constructing a plurality of frames with the predetermined number of packets are only exemplary, and the present invention is not limited thereto.
  • the packet information controller 245 adds packet start information to the packet depending on whether the count result is equal to the predetermined number of packets, irrespective of the frame unit or field unit.
  • the packet start information that is added to the header of the packet is also applicable to a single transport stream packet.
  • the digital broadcast transmitter 600 includes a randomizer 610, an RS encoder 620, an interleaver 630, a trellis encoder 640, a multiplexer 650, and a modulator 660.
  • the RS encoder 620 and the interleaver 630 can be omitted, and the positions of the RS encoder 620 and the interleaver 630 can be changed.
  • the randomizer 610 randomizes the dual transport stream (TS).
  • the dual transport stream (TS) input to the randomizer 610 is obtained by multiplexing the normal stream and the turbo stream, and includes a parity region for adding the parity.
  • the RS encoder 620 adds the parity to the parity region included in the packet of the input dual transport stream (TS).
  • the RS encoder 620 is in the form of a concatenated coder for adding the parity to the transport stream (TS) in order to correct an error that may occur due the channel characteristics in the course of packet transmission.
  • the interleaver 630 interleaves the dual transport stream (TS) input from the RS encoder 620.
  • TS transport stream
  • interleaving' does not mean the change of data, but means the position change of data in the data frame.
  • the trellis encoder 640 performs a trellis encoding of the dual transport stream (TS) interleaved by the interleaver 630, and transmits the trellis -encoded dual transport stream (TS) in a packet buffer (not shown) for temporarily storing the received dual transport stream (TS).
  • the multiplexer 650 sets the clock synchronization of the TS construction unit 200 and the digital broadcast transmitter 600 equal to each other using a Global Positioning System (GPS), determines whether the received dual transport stream (TS) packet is the VFIP, and constructs a frame by adding the segment sync signal and the field sync signal to the dual transport stream (TS) on the basis of the result of such a determination.
  • GPS Global Positioning System
  • the multiplexer 650 includes a sync setting unit 651 and a frame ge nerator 653.
  • the sync setting unit 651 uses the GPS to set the clock synchronization of the TS construction unit 200 and the digital broadcast transmitter 600.
  • the sync setting unit 651 receives a time sync signal of predetermined bits through an artificial satellite, and sets the clock synchronization of the TS multiplexer 240 of the TS construction unit 200, as shown in FIG. 2, and the multiplexer 650 of the digital broadcast transmitter 600, as shown in FIG. 6, based on the time sync signal.
  • the VFIP is a packet to which the packet start information is added, and indicates that the next packet is the first packet constituting the frame.
  • the frame generator 653 discards the received dual transport stream (TS) if the stream is not the VFIP, while generating a frame by gathering the predetermined number of packets that are received after the VFIP if the stream is the VIFP. In this case, the frame generator 653 determines whether the received packet is the VFIP by detecting the existence/nonexistence of the packet start information added to the header of the received packet.
  • TS received dual transport stream
  • the frame generator 653 constructs a frame by grouping the predetermined number of packets after the VFIP until the packet that is the next VFIP is received. In this case, if the VFIP is received after the initial VFIP, the frame generator 653 uses the received VFIP as a verification packet, and regenerates a frame by gathering the predetermined number of packets received after the verification packet.
  • the modulator 660 performs a channel modulation of the dual transport stream (TS) multiplexed by the multiplexer 650, and converts the modulated transport stream (TS) into an RF channel band signal to transmit the converted RF channel band signal, via a transmission channel.
  • TS dual transport stream
  • FIG. 7 is a flowchart explaining a method for operating a digital broadcast transmitter according to an embodiment of the present invention.
  • the sync setting unit 651 sets the clock synchronization of the TS construction unit 200, as shown in FIG. 2, and the digital broadcast transmitter 600, as shown in FIG. 6, using the GPS at operation S710.
  • the sync setting unit 651 receives a time sync signal of predetermined bits through an artificial satellite, and sets the clock synchronization of the TS multiplexer 240 of the TS construction unit 200, as shown in FIG. 2, and the multiplexer 650 of the digital broadcast transmitter 600, as shown in FIG. 6, based on the time sync signal.
  • the VFIP is a packet to which the packet start information is added, and indicates that the next packet is the first packet constituting the frame.
  • the frame generator 653 determines whether the received dual transport stream (TS) is the VFIP by detecting the existence/nonexistence of the packet start information added to the header of the received packet. That is, the frame generator 653 determines the received packet as the VFIP if the packet start information has been added to the header of the packet, while determining the received packet as a packet that is not the VFIP.
  • the frame generator 653 If the received packet is the VFIP, the frame generator 653 generates a frame by gathering the predetermined number of packets, starting from the first packet received after the VFIP at operation S730. In this case, it is preferable that one frame is composed of 624 packets except for the field sync segment. The frame generator 653 generates a frame by grouping 624 packets received after the VFIP, and then generates a frame by grouping 624 packets in succession.
  • the number of packets constituting one frame is set to 624.
  • this is only an exemplary, and the present invention is not limited thereto.
  • the frame generator 653 determines whether a verification packet is received at operation S740.
  • the verification packet is the VFIP received by the frame generator 653 after the VFIP is first received. If the verification packet is received, the frame generator 653 verifies the frame by checking the number of packets gathered to generate the frame at operation S750. For example, if the frame is composed of 624 packets, the frame generator 653 checks if 624 packets including the verification packet are gathered. If 624 packets are gathered, the frame generator 653 determines that the frames are properly constructed, and continuously generates the frames.
  • the frame generator 653 discards all the packets gathered for the frame generation, and regenerates a frame by gathering 624 packets received after the verification packet at operation S760. By contrast, if the received packet is not the VFIP at operation S720, the frame generator 653 discards the received packet at operation S770.
  • the digital broadcast transmitter and the signal processing method thereof it is also applicable to a single transport stream packet to generate a frame by determining whether the received packet is the VFIP packet to which the packet start information is added.

Abstract

L'invention porte sur un système de diffusion numérique et sur un procédé de traitement de données associé. Un appareil conçu pour générer un flux de transport comprend un générateur de paquets conçu pour générer une pluralité de paquets par compression de signaux vidéo et audio; un compteur conçu pour déterminer le nombre de paquets générés et pour générer le résultat du comptage; et une unité de contrôle des informations conçue pour déterminer si le résultat du comptage atteint un nombre prédéterminé de paquets, ladite unité de contrôle étant également conçue pour introduire les informations de début de paquet dans les paquets en fonction du résultat du comptage et pour transmettre les paquets comprenant les informations de début de paquet. Les informations de début de paquet sont ajoutées à un paquet transmis ultérieurement à un émetteur, et les informations de début de paquet sont extraites du paquet reçu dans un récepteur, de manière à réduire la perte de ressources de fréquence.
EP07745728A 2006-04-04 2007-03-30 Systeme de diffusion numerique et procede de traitement de donnees associe Withdrawn EP2008451A4 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP09173540A EP2159946A3 (fr) 2006-04-04 2007-03-30 Système de diffusion numérique et procédé de traitement de données correspondant
EP09173534A EP2160034A3 (fr) 2006-04-04 2007-03-30 Système de diffusion numérique et procédé de traitement de données correspondant

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US78870706P 2006-04-04 2006-04-04
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CA2684993C (fr) 2012-06-05
CN101697589A (zh) 2010-04-21
EP2008451A4 (fr) 2012-10-31
BRPI0722370A2 (pt) 2011-08-16
EP2159946A2 (fr) 2010-03-03
CN101697588A (zh) 2010-04-21
KR100793963B1 (ko) 2008-01-16
CA2644340A1 (fr) 2007-10-11
BRPI0722369A2 (pt) 2011-08-16
WO2007114598A1 (fr) 2007-10-11
EP2160034A2 (fr) 2010-03-03
CN101697590A (zh) 2010-04-21
CN101411188A (zh) 2009-04-15
CN102387357A (zh) 2012-03-21
CA2684401C (fr) 2014-07-08
EP2160034A3 (fr) 2013-01-30
KR20070099391A (ko) 2007-10-09
BRPI0710520A2 (pt) 2011-05-10
CN101697588B (zh) 2013-01-30
MX2008012802A (es) 2008-10-15
CA2684993A1 (fr) 2007-10-11
CN101697590B (zh) 2013-09-25
EP2159946A3 (fr) 2012-10-31
CN101697589B (zh) 2012-12-12

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