CN101257634A - Digital broadcasting system and error correction method thereof - Google Patents

Digital broadcasting system and error correction method thereof Download PDF

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Publication number
CN101257634A
CN101257634A CNA2007103036005A CN200710303600A CN101257634A CN 101257634 A CN101257634 A CN 101257634A CN A2007103036005 A CNA2007103036005 A CN A2007103036005A CN 200710303600 A CN200710303600 A CN 200710303600A CN 101257634 A CN101257634 A CN 101257634A
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China
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fec
multicast
digital broadcast
mpeg
grouping
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CNA2007103036005A
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Chinese (zh)
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CN101257634B (en
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姜永硕
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
    • H04H60/11—Arrangements for counter-measures when a portion of broadcast information is unavailable
    • H04H60/12—Arrangements for counter-measures when a portion of broadcast information is unavailable wherein another information is substituted for the portion of broadcast information
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/20—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits characterised by logic function, e.g. AND, OR, NOR, NOT circuits
    • H03K19/21—EXCLUSIVE-OR circuits, i.e. giving output if input signal exists at only one input; COINCIDENCE circuits, i.e. giving output only if all input signals are identical
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/25—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling 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
    • H04N21/23605—Creation or processing of packetized elementary streams [PES]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling 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
    • H04N21/2362—Generation or processing of Service Information [SI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing 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
    • H04N21/434—Disassembling 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
    • H04N21/4343—Extraction or processing of packetized elementary streams [PES]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/64—Addressing
    • H04N21/6405—Multicasting

Abstract

A digital broadcasting system and an error correction method thereof includes: a server to group a predetermined number of multicast packets to obtain Forward Error Correction (FEC) groups for digital broadcast data (MPEG TS) transmission, to create FEC data for each multicast packet using digital broadcast data (MPEG TS) of the multicast packets in the FEC groups, including the FEC data in the multicast packets, and to transmit the resultant multicast packets over a network; and a set-top box to recover digital broadcast data (MPEG TS) pieces of the digital broadcast data (MPEG TS) pieces of multicast packets other than the lost multicast packet in the FEC group to recover the lost multicast packet in response to a multicast packets received over the network being lost.

Description

Digit broadcasting system and error correction method thereof
Technical field
The present invention relates to a kind of digit broadcasting system and error correction method thereof, more specifically, relate to a kind of digit broadcasting system and reach the error correction method of correcting the multicast grouping of losing by forward error correction.
Background technology
Digit broadcasting system compresses the program of a plurality of channels effectively based on Motion Picture Experts Group (MPEG) coding standard, based on the program of these channels of the digital modulation system of each transmission medium multiplexed effectively (multiplex), and transmits these programs.Correspondingly, this digit broadcasting system can be broadcasted and tens ofly do not used many repeaters to hundreds of channels, and this is different from analog broadcast system.
Depend on transmission medium, digital broadcasting can be classified as DTB Digital Terrestrial Broadcasting, digital satellite broadcasting and cabled digital broadcasting.The present age, digital satellite broadcasting expanded to the whole world, and DTB Digital Terrestrial Broadcasting is also tested in the U.S. and some European countries.
Most of digital broadcast service all provide by wired mode.Yet, being accompanied by the development of recent high-speed Internet technology, such digital broadcast service can provide by Internet Protocol (IP) network.
The digit broadcasting system that is used to provide digital broadcast service comprises: the digital broadcast service device provides broadcast data by IP network; And a plurality of set-top box that are connected to this IP network, be used for the broadcast data that comes from the digital broadcast service device is offered the user.
An analog broadcasting data transaction and a boil down to digital broadcast data that the digital broadcast service device receives from the digital broadcasting station (system operation device) by coding, and the grouping that comes multicast (multicast) to be produced by IP network.Can constitute the multicast grouping that transmits by IP network according to moving picture expert group 2 (MPEG-2) transport stream (TS) standard.
That is to say that the digital broadcast service device is multicasted to IP network to the broadcast data of arbitrary channel.
Set-top box is decoded and is decompressed the multicast grouping that receives by IP network, and the digital broadcast data that is produced is offered Digital Television.
As mentioned above, digital broadcast data is multicasted to set-top box by IP network from the digital broadcast service device.When the digital broadcast data on the IP network (MPEG TS) when losing, this multicast does not allow to transmit again these data.
Correspondingly, the Digital Television that links to each other with the set-top box digital broadcast data of active again.On the contrary, its on screen with the corresponding reproduction regions of digital broadcast data of losing in display noise.
In order to address this problem, use forward error correction (FEC).FEC is a kind of like this method: transmission is used for a plurality of FEC grouping of lost packet recovery and the multicast stream of packets of digital broadcast data (MPEG TS), and by using relevant FEC grouping and being adjacent to the multicast grouping that the grouping of the multicast grouping of losing recovers to lose.
As shown in Figure 1, FEC grouping f (A, B) and f (B C) is inserted between the original multicast stream of packets.Note, and f (A, B)=A XOR B and f (B, C)=B XOR C.
That is to say, the digital broadcast service device with a plurality of FEC grouping f (A, B) and f (B C) is inserted into original multicast stream of packets A, B, C, D, E ... between, and by these groupings of IP network multicast.
Set-top box is by the required FEC grouping of the multicast grouping that use to recover to lose and be adjacent to the grouping of the multicast grouping of losing, and recovers the multicast grouping of losing from the multicast stream that the digital broadcast service device receives by IP network.
For example, when the grouping B the multicast stream that receives from the digital broadcast service device by IP network lost, (B C) carried out XOR (XOR) operation, with the grouping B that recovers to lose to set-top box to contiguous grouping C and FEC grouping f.
As mentioned above, the digital broadcast service device is increased to the FEC grouping between the multicast stream of packets, and transmits the grouping that is produced by IP network, so that the grouping B that the set-top box recovery is lost.Yet the FEC grouping that is increased causes the expense on the IP network to increase.
For example, as shown in fig. 1, compare with original multicast stream of packets, the FEC grouping that is increased causes the expense on the IP network to double.
In addition, increasing the FEC grouping that is used for lost packet recovery requires set-top box to possess FEC packet transaction parts.
Summary of the invention
The purpose of this invention is to provide a kind of digit broadcasting system and error correction method thereof, the multicast that comprises forward error correction (FEC) group of the FEC data that are used for lost packet recovery by transmission divides into groups to alleviate the load of network.
A first aspect of the present invention provides a kind of digit broadcasting system, comprise: server, the multicast of predetermined quantity is divided into groups to obtain to be used for forward error correction (FEC) group of digital broadcast data (MPEG TS) transmission, use the digital broadcast data (MPEG TS) of the multicast grouping in the FEC group to create the FEC data for each multicast grouping, described FEC data are included in the multicast grouping, and transmit the multicast grouping that is produced by network; And set-top box, lose in response to the multicast grouping that receives by network, each digital broadcast data (MPEG TS) burst of the multicast grouping that digital broadcast data (MPEG TS) burst that divides into groups by the multicast except the multicast of losing is divided into groups recovers to lose, and the digital broadcast data that is recovered (MPEG TS) burst is carried out combination divide into groups with the multicast that recovers to lose.
Described server can comprise: the FEC group is provided with device, the multicast of predetermined quantity is divided into groups, to obtain to be used for the multicast FEC group of digital broadcast data (MPEG TS) transmission; The data sementation device carries out segmentation according to setting several digital broadcast datas (MPEG TS) to the multicast grouping in the FEC group; The FEC data are provided with device, carry out segmentation according to setting several digital broadcast datas (MPEG TS) that multicast in the FEC group is divided into groups separately, come the FEC data to be set by the digital broadcast data (MPEG TS) of segmentation being carried out XOR (XOR) computing for each multicast grouping, described FEC data are included in the multicast grouping, and transmit the multicast grouping that is produced by network; And the FEC header is provided with device, and stream ID, sequence number and the order of each multicast grouping in the FEC group is set, and described stream ID, sequence number and order are included in during each multicast divides into groups.
Described set-top box can judge whether there is the grouping of losing based on described sequence number.
A second aspect of the present invention provides a kind of server that is used for digit broadcasting system, described server comprises: forward error correction (FEC) group is provided with device, and the multicast of predetermined quantity is divided into groups to obtain to be used for the FEC group of digital broadcast data (MPEG TS) transmission; The data sementation device carries out segmentation according to setting several digital broadcast datas (MPEG TS) to the multicast grouping in the FEC group; And the FEC data are provided with device, carry out segmentation according to setting several digital broadcast datas to the multicast grouping in the FEC group, come the FEC data to be set by the digital broadcast data (MPEG TS) of segmentation being carried out XOR (XOR) computing for each multicast grouping, described FEC data are included in the multicast grouping, and transmit the multicast grouping that is produced by network.
Described server can also comprise: the FEC header is provided with device, and stream ID, sequence number and the order of each multicast grouping in the FEC group is set, and described stream ID, sequence number and order are included in each multicast grouping.
A third aspect of the present invention provides a kind of set-top box that is used for digit broadcasting system, and described set-top box comprises: the mistake determinant, judge based on the sequence number that comprises in the multicast grouping whether any multicast grouping that receives by network loses; At least one buffer; And the error correction device, divide into groups by the multicast that forward error correction (FEC) data of recovering the multicast grouping except the multicast grouping of losing in the FEC group are recovered to lose.
A fourth aspect of the present invention provides a kind of and at digit broadcasting system the method for error correction information has been set in server, and described method comprises: the multicast to predetermined quantity is divided into groups, to obtain to be used for the FEC group of digital broadcast data (MPEG TS) transmission; Carry out segmentation according to setting several digital broadcast datas (MPEG TS) to the multicast grouping in the FEC group; And carry out segmentation according to setting several digital broadcast datas (MPEG TS) to the multicast grouping in the FEC group, use the digital broadcast data (MPEG TS) of segmentation forward error correction (FEC) information to be set for each multicast grouping, described FEC data are included in the multicast grouping, and transmit the multicast grouping that is produced by network.
Carry out segmentation according to setting several digital broadcast datas (MPEG TS) to the multicast grouping in the FEC group, use the digital broadcast data (MPEG TS) of segmentation the FEC data to be set for each multicast grouping, described FEC data are included in the multicast grouping, and can comprise: carry out XOR (XOR) computing by digital broadcast data (MPEG TS), for each multicast grouping is provided with the FEC data to segmentation by the step that network transmits the multicast grouping that is produced.
Described method can also comprise: stream ID, sequence number and the order of each multicast grouping in the FEC group are set, and described stream ID, sequence number and order are included in each multicast grouping.
A fifth aspect of the present invention provides a kind of method of carrying out error correction in the set-top box of digit broadcasting system, and described method comprises: based on the sequence number that is included in each multicast grouping, judge whether any multicast grouping that receives by network loses; Digital broadcast data (MPEG TS) burst that the multicast that recovers to lose by the FEC data of the multicast grouping except the multicast grouping of losing in the EFC group is divided into groups, the digital broadcast data that is recovered (MPEG TS) burst is carried out combination, with the multicast grouping that recovers to lose.
Description of drawings
Do further detailed description with reference to the accompanying drawing that next is associated, the present invention and subsidiary many advantages thereof will be understood more significantly easilier, in the accompanying drawings, and the identical identical or similar parts of Reference numeral representative, wherein:
Fig. 1 is the diagram of the forward error correction (FEC) of the multicast grouping that is used to recover to lose in digit broadcasting system;
Fig. 2 is the diagram according to the digit broadcasting system of the embodiment of the invention;
Fig. 3 is the block diagram according to the FEC server of the embodiment of the invention;
Fig. 4 is the block diagram according to the set-top box of the embodiment of the invention;
Fig. 5 is the diagram according to the multicast grouping of the embodiment of the invention;
Fig. 6 is the diagram of FEC header fields among Fig. 5;
Fig. 7 is the diagram according to the digital broadcast data of the segmentation of the embodiment of the invention (MPEG TS);
Fig. 8 is the diagram according to the FEC field of the multicast grouping in the FEC group of the embodiment of the invention;
Fig. 9 is the flow chart that is used for being provided with at the FEC server method of FEC data according to the embodiment of the invention;
Figure 10 is the flow chart that carries out the method for error correction according to the embodiment of the invention in set-top box; And
Figure 11 is the flow chart of the process in the FEC zone of recovery multicast grouping in the error correction method of the set-top box of Figure 10.
Embodiment
Hereinafter, with reference to corresponding accompanying drawing example embodiment of the present invention is described.For clear and concise, known theme relevant with the present invention in this area will no longer be described.
Fig. 2 is the diagram according to the digit broadcasting system of the embodiment of the invention.
Original MPEG-TS is based on the wired broadcasting network.Correspondingly, data are divided according to 188 byte units, and RS-CODE is increased in the data, the error correction (digital video-frequency broadcast standard) when being used for by wire transmission.
Like this, most of broadcasting equipments all use MPEG-TS that data are encoded, and as a reference, most of IP TV use 1316 bytes, and this is according to 188 byte units of MPEG-TS system 7 times.
Because a grouping comprises 1500 bytes at the most in the Ethernet, after using 1344 bytes, be left 156 bytes so.
Correspondingly, in this application, 156 remaining bytes are used for the FEC field, therefore, can maximize the performance of the equipment that is set to use 1500 bytes.
Because ethernet device is set to use 1500 bytes, it can not use more than 1500 bytes.Correspondingly, ethernet device uses the size that approaches 1500 bytes most.
With reference to Fig. 2, comprise streaming server 20, FEC server 30 and a plurality of set-top box 40 according to the digit broadcasting system of the embodiment of the invention.
The digital broadcast data that streaming server 20 provides the broadcasting station (not shown) (MPEG TS) is converted to the multicast grouping of MPEG-TS form, and this multicast grouping is offered FEC server 30.
FEC server 30 according to predetermined number (for example, 10) multicast that comes from streaming server 20 is divided into groups, to obtain the FEC group, the number of the multicast grouping in the FEC group is subtracted 1, and the length of the digital broadcast data (MPEG TS) that comprises in the multicast grouping divided by subtracting each other end value, to obtain section length " fragment_size ".
FEC server 30 is created the FEC data for each multicast grouping, be used for using the number of FEC group multicast grouping and the multicast grouping that section length recovers to lose, the FEC data that generate are included in the corresponding multicast grouping, and the multicast grouping that is produced are multicasted to set-top box 40 by IP network.
40 pairs of multicast groupings that receive by IP network of set-top box are decoded and are decompressed, and the digital broadcast data that is produced is offered Digital Television.
When any multicast packet loss of receiving by IP network, set-top box 40 is included in FEC by use and organizes the multicast grouping that the FEC data in the corresponding multicast grouping are recovered to lose.
Just, when any multicast packet loss of receiving by network, each burst (piece) of the digital broadcast data (MPEG TS) that the FEC data that set-top box 40 is divided into groups by the multicast except that the multicast grouping of losing are recovered to lose, and the burst of the digital broadcast data (MPEG TS) that recovers carried out combination, with the multicast grouping that recovers to lose.
Fig. 3 is the block diagram according to the FEC server of the embodiment of the invention.
With reference to accompanying drawing 3, the FEC server comprises that the FEC group is provided with device 31, device 32 is set the FEC header and the FEC data are provided with device 36.The FEC header is provided with device 32 and comprises that stream ID is provided with device 33 and order is provided with device 35.The FEC data are provided with device 36 and comprise data sementation device 39.
FEC group is provided with device 31 divides into groups to the multicast that receives from streaming server according to the number of setting (for example 10), organizes to obtain FEC.
The form of the multicast grouping that comes from streaming server has been shown among Fig. 5.
As shown in Figure 5, the multicast grouping comprises IP address field 50, UDP field 51, digital broadcast data (MPEG TS) field 52, FEC header fields 53 and FEC data field 54.
IP address field 50 comprises the IP address of streaming server, and this is the source that generates the multicast grouping, but also comprises the FEC group address, and the multicast grouping will transfer to this address.IP address field 50 comprises 20 bytes.
The 51 indication multicast groupings of UDP field are transmitted by udp protocol.UDP field 51 comprises 8 bytes.
Digital broadcast data (MPEG TS) field 52 comprises digital broadcast data (MPEG TS), and comprises 1316 bytes.
FEC header fields 53 comprises the multicast grouping that is used to recover to lose and the FEC that creates is provided with, and comprises 8 bytes.
FEC data field 54 comprises the multicast grouping that is used to recover to lose and the FEC data of creating, and has the length of " fragment_size " among Fig. 6.
Fig. 6 is used to create the information of FEC data of multicast grouping and the diagram of information that can the pursuing missing grouping information, and these information are that the grouping that recovers to lose by set-top box is needed.
With reference to Fig. 6, the FEC header comprises FEC group length group_size, stream ID stream_ID, the order diff of multicast grouping in the FEC group, section length fragment_size and sequence number.
FEC group length group_size is corresponding to the number of multicast grouping in the FEC group.FEC group is that it will be used to constitute the FEC data by the be mutually related group of burst of digital broadcast data (MPEG TS) of multicast grouping of XOR.For example, when a multicast packet loss, digital broadcast data (MPEG TS) part of the multicast of losing grouping can divide into groups to recover by all other multicast in the FEC group.Owing to allow each FEC group to recover a multicast grouping of losing,, but increased the expense on the network so less FEC group length provides good recovery rate.
Stream ID stream_ID represents to be used for discerning the ID of the digital broadcast data (MPEG TS) that is included in multicast stream.
The order diff of first multicast grouping is that the order diff of 0, the second grouping is 1 in the FEC group ..., the order diff of last grouping is group_size-1.
Section length fragment_size represents certain length, and (MPEG TS) carries out segmentation according to this length digital broadcast data, and to create the FEC data, this length is corresponding to the length of FEC data.
Sequence number represents to distribute to the numbering of each multicast grouping, is used to discern the multicast grouping of losing.
Hereinafter describe and be used for being provided with the FEC header fields of Fig. 5 and the method for FEC data.
Fig. 6 is the diagram of FEC header fields.
At first, determine FEC group length group_size.Depend on network state, the FEC group length can at random be selected from 10 to 255 the scope.
Because allow each FEC group to recover a multicast grouping of losing, less FEC group can provide good recovery rate, but has increased the expense on the network, and this just requires the operator to select the group length that is fit to.
In the following description, the FEC group length is assumed that 10.
When having defined the FEC group length, the FEC header is provided with device 32 this definition value is set in the group_size field, and the positive integer in being defined as section length fragment_size from 1316/ (group_size-1) to 148 scope.
1316/(group_size-1)？fragment_size？148
Then, the stream ID that is provided with in the device 32 of FEC header is provided with device 33 recorded stream IDstream_ID.
Each channel at digital broadcasting stream is provided with a stream ID stream_ID, and the operator can be defined as arbitrary value with it.In set-top box, because being used to discern the stream with same stream ID value, sequence number sequence_number divides into groups whether to lose to check multicast, therefore this stream ID must be defined between the different channel and not overlap.
When being provided with stream ID, sequence number is provided with the order of device 34 according to digital broadcast data (MPEG TS), and the sequence number sequence_number of the multicast grouping that belongs to the FEC group is set.In set-top box, whether sequence number sequence_number is set for identification multicast grouping and loses, and it can have value 0,1,2 ..., 65535.After maximum 65535, be set to the sequence number that multicast is divided into groups to 0.
When being provided with sequence number, the order that the FEC header is provided with in the device 32 is provided with the order that device 35 then is provided with the multicast grouping that comprises in the FEC group.In the group order diff of multicast grouping reflected with the FEC group in the distance of first grouping.The order of first grouping is that the order of 0, the second grouping is 1 in the FEC group ..., the order of last grouping is group_size-1.
After the order of multicast grouping, the FEC header is provided with device 32 set stream ID, each sequence number, group length, multicast order of packets diff and section length is included in the FEC header of each multicast grouping in being provided with the FEC group.
The method of the FEC data field be used for being provided with Fig. 5 is hereinafter described.
54 storages of FEC data field are provided with the data that device 36 is created by the FEC data.When the FEC header is provided with information in the FEC header that device 32 has been provided with each multicast grouping, the FEC data are provided with device 36 based on the section length fragment_size that is provided with in the FEC header, and the digital broadcast data (MPEG TS) that comprises in the multicast grouping is carried out segmentation.
Fig. 7 shows the digital broadcast data (MPEG TS) that carries out segmentation according to section length.Fig. 7 is to be the diagram of the digital broadcast data (MPEG TS) of 148 times institute's segmentation as section length fragment_size.As can be seen, be 148 according to section length fragment_size, digital broadcast data (MPEG TS) is segmented into the burst of 9 148 bytes.
After digital broadcast data (MPEG TS) was segmented into the burst of section length, the FEC data were provided with the FEC data that device 36 obtains to insert the FEC data field of the multicast grouping shown in Fig. 5.
Particularly, the FEC data are provided with device 36 digital broadcast data (MPEG TS) are segmented into burst, then initialization first buffer 37 and second buffer 38.Preferably, first buffer 37 and second buffer 38 have section length.
When the order diff of the order n of the multicast grouping that is used to recover the FEC data in the FEC group and the multicast grouping that is used to extract digital broadcast data (MPEG TS) burst did not match, the FEC data were provided with device 36 (diff-1) individual digital broadcast data (MPEG TS) burst of multicast grouping n are stored in second buffer 38.
The FEC data are provided with that 36 pairs of devices are stored in the FEC data in first buffer 37 and digital broadcast data (MPEG TS) burst that is stored in second buffer 38 is carried out XOR (XOR) operation, and the value that is produced is stored in first buffer 37.
When the order diff coupling of the order n of the multicast grouping that is used to recover the FEC data in the FEC group and the multicast grouping that is used to extract digital broadcast data (MPEG TS) burst, the FEC data are provided with device 36 can increase set point 1 to the order diff of this multicast grouping, to extract digital broadcast data (MPEG TS) burst of next multicast grouping.That is to say that this multicast grouping n stores with " diff+1 ", to extract next digital broadcast data (MPEG TS) burst.
On the other hand, when count value (n) order of the multicast grouping that increases set point did not match with the FEC group length, the FEC data were provided with device 36 and stores diff digital broadcast data (MPEG TS) burst that divides into groups with the corresponding multicast of count value (n) order in second buffers 38.
The FEC data are provided with the FEC data and digital broadcast data (MPEG TS) the burst execution XOR that is stored in second buffer 38 that 36 pairs of devices are stored in the multicast grouping n in first buffer 37, and the value that is produced is stored in first buffer 37.
When multicast grouping in the FEC group when front sequence (n=diff+1) during with FEC group length coupling, the FEC data are provided with device 36 will be stored in value insertion FEC data field in first buffer 37.
After the value insertion FEC data field that is stored in first buffer 37, the FEC data are provided with the multicast grouping that device 36 is produced by the IP network multicast.
Fig. 4 is the block diagram according to the set-top box of the embodiment of the invention.
With reference to Fig. 4, set-top box 40 comprises network interface 41, mistake determinant 42 and error correction device 43.
Mistake determinant 42 receives the multicast stream of packets by IP network, and judges based on sequence number whether the grouping of multicast arbitrarily loses.When it judged the multicast packet loss, mistake determinant 42 control error corrector 43 were to recover this multicast of losing grouping.
In order to recover to be included in the digital broadcast data (MPEG TS) in the multicast grouping of losing, digital broadcast data (MPEG TS) burst that error correction device 43 divides into groups by the multicast that the FEC data of the multicast grouping except that the multicast grouping of losing in the FEC group are recovered to lose, and digital broadcast data (MPEG TS) burst that recovers carried out combination, with the digital broadcast data (MPEG TS) of the multicast grouping that recovers to lose.
Fig. 9 is the flow chart that the method for FEC data is set at FEC server place according to the embodiment of the invention.
As shown in Figure 9, the count value (n) that multicast was divided into groups during FEC server initialization first buffer 37, second buffer 38 and FEC organized is (S90) in proper order.Preferably, first buffer 37 and second buffer 38 possess section length.
The diff that the FEC server is judged the grouping be used for being provided with the FEC data whether with the count value n coupling (S91) of Fig. 9.Notice that diff is illustrated in the diff value that is used to create the FEC data that is provided with among Fig. 6, this value is fixed before flow process finishes.The value of count value ' n ' expression counter, this counter is carried out " group_size-1 " inferior XOR to digital broadcast data (MPEG TS), to create the FEC data.
When count value (n) order of the grouping of the multicast in the FEC group and multicast order diff in the FEC group of multicast grouping of FEC data will be set not match the time, the FEC server in second buffer 38, store with the FEC group in divide into groups (diff-1) individual digital broadcast data (MPEG TS) burst (S92) of n of the corresponding multicast of count value (n) order.
The FEC server is carried out XOR to digital broadcast data (MPEG TS) burst that is stored in digital broadcast data (MPEG TS) burst in first buffer 37 and be stored in second buffer 38, and the value that is produced is stored in first buffer 37 (S93).
The FEC server increases progressively 1 to count value n, extracting digital broadcast data (MPEG TS) burst of next multicast grouping, and returns step S91 (S94).
When the multicast order diff in the FEC group of count value (n) order that the multicast in the FEC group is divided into groups and the multicast grouping that the FEC data will be set mates, the FEC server is by increasing progressively 1 to the order diff of the multicast grouping that the FEC data will be set, and the multicast that will extract digital broadcast data (MPEG TS) n that divides into groups is set to " diff+1 " (S95).That is to say, when " n " equals " diff ", the FEC server is made as the value of " diff+1 " to ' n ', to select next multicast grouping, this is identical with the multicast grouping that will constitute the FEC data because will experience digital broadcast data (MPEG TS) burst of XOR in first buffer.
The FEC server judges whether the count value n of the multicast grouping that increases set point mates (S96) with the FEC group length.
When judge the multicast grouping that increases set point when front sequence (n=diff+1) and FEC group length do not match, the FEC server is stored the corresponding digital broadcast data of order diff (MPEG TS) burst with the multicast grouping that the FEC data will be set in second buffer 38, this burst be with the multicast grouping that increases set point as one of digital broadcast data (MPEG TS) burst of the segmentation of the corresponding multicast grouping of front sequence (n=diff+1) (S97).
The FEC server is carried out XOR to digital broadcast data (MPEG TS) burst that is stored in digital broadcast data (MPEG TS) burst in first buffer 37 and be stored in second buffer 38, and the value that is produced is stored in first buffer 37 (S98).
The FEC server increases progressively 1 to count value n, returns step S96 then to extract digital broadcast data (MPEG TS) burst (S99) of next multicast grouping.
Simultaneously, the multicast grouping in judging FEC group when front sequence (n=diff+1) during with FEC group length coupling, the FEC server will be stored in the value insertion FEC data field in first buffer 37.Then, the multicast grouping (S100) that produced by the IP network multicast of FEC server.
Hereinafter the method that the FEC data are set in the FEC server according to the embodiment of the invention is described in further detail with reference to Fig. 8.
Fig. 8 is the diagram according to the FEC field of the multicast grouping in the FEC group of the embodiment of the invention.
As can be seen from Figure 8, the FEC group comprises 10 multicast groupings from A to J.Correspondingly, the FEC group length is " 10 ".Sequence number from 100 to 109 for the multicast grouping setting in the FEC group.
In the FEC group, the order of multicast grouping A is " 0 ", and the order of multicast grouping B is " 1 " ..., and the order of multicast grouping J is " 9 ".
Illustrate digital broadcast data (MPEG TS) burst of the FEC data of the multicast grouping that is used for creating the FEC group.For example, as can be seen, digital broadcast data (MPEG TS) burst that is used to create the FEC data of multicast grouping A comprises B0, C0, D0, E0, F0, G0, H0, I0 and J0.In B0, B represents multicast grouping B, and first digit broadcast data (MPEGTS) burst of " 0 " expression multicast grouping B.
Hereinafter the method that FEC is set is described with reference to Fig. 9.Suppose that the FEC data to multicast grouping C are provided with.
The count value (n) of the multicast grouping in FEC server initialization first buffer 37, second buffer 38 and the FEC group is (S90) in proper order.Preferably, first buffer 37 and second buffer 38 have section length.
Count value (n) order that the FEC server is judged the multicast grouping in the FEC group whether with the multicast order of packets diff coupling (S91) that is used to be provided with the FEC data.
Because the multicast order (diff=2) in the FEC group of front sequence (n=0) and the multicast grouping that the FEC data will be set of the grouping of the multicast in the FEC group does not match, so the FEC server is stored the corresponding digital broadcast data of order diff=2 (MPEG TS) the burst A1 with the multicast grouping that the FEC data will be set in second buffer 38, this burst A1 is one of digital broadcast data (MPEG TS) burst of working as the corresponding multicast grouping of front sequence (n=0) A in dividing into groups with multicast (S92).
The FEC server is carried out XOR to digital broadcast data (MPEG TS) burst that is stored in digital broadcast data (MPEG TS) burst in first buffer 37 and be stored in second buffer 38, and once more the value that is produced is stored in first buffer 37 (S93).
Then, the FEC server increases progressively count value (n) order of the multicast grouping in the FEC group sets number " 1 ", and returns step S91 (S94).
Because at step S91, count value (n) order of multicast grouping becomes ' 1 ', and the order diff that the multicast grouping of FEC data will be set is ' 2 ', and the FEC server then forwards step S92 to.
That is to say that the FEC server stores second digit broadcast data (MPEG TS) the burst B1 of multicast grouping B in second buffer 38 (S92) into.
Then, the FEC server is carried out XOR to the value of first buffer 37 and the value of second buffer 38.
In this case, be stored in the result that value in first buffer 37 is moved " 0 XOR A1 XORB1 " exactly.
Then, the FEC server increases progressively 1 with count value (n) order of multicast grouping, and returns step S91.
Because the count value (n) of judging the multicast grouping at step S91 order diff " 2 " coupling of " 2 " and the multicast grouping that the FEC data will be set in proper order, so the FEC server forwards step S95 to.
The FEC server increases progressively the order diff " 2 " of the multicast grouping that the FEC data will be set sets number " 1 ", and the value that produced of storage is as the count value (n) of multicast grouping (S95) in proper order.Correspondingly, the order diff that the multicast grouping of FEC data will be set becomes " 3 ".That is to say that owing to be " diff (2)+1 ", the order that the multicast grouping of FEC data will be set becomes " 3 ".
The FEC server checks whether the order n of the multicast grouping of FEC data " 3 " mates (S96) with the FEC group length.
Do not match with FEC group length " 10 " because the order (n) " 3 " of the multicast grouping of FEC data will be set, so the FEC server forwards step S97 to.
Correspondingly, the FEC server is stored third digit broadcast data (MPEG TS) the burst D2 of multicast grouping D in second buffer 38, and forwards step S98 to.
The FEC server is carried out XOR to the value of first buffer 37 and the value of second buffer 38, and once more the value that is produced is stored in first buffer 37 (step S98).The value that is stored in first buffer 37 is the operation result of " 0 XOR A1 XOR B1 XOR D2 ".
The FEC server increases progressively 1 with count value (n) order of multicast grouping, and returns step S96.
Then, the FEC server repeatedly execution in step S96 mate with the FEC group length up to count value (n) order of multicast grouping to S99.
Multicast grouping when make FEC group to S99 by repeated execution of steps S96 in when front sequence mates with the FEC group length, the FEC server will be stored in the value insertion FEC data field (S100) in first buffer 37.Then, the FEC server is by this multicast grouping of IP network multicast.
The value that is inserted into the FEC data field is the operation result of " 0 XOR A1 XOR B1 XOR D2 XOR E2 XORF2 XOR G2 XOR H2 XOR I2 XOR J2 ".
Figure 10 is the flow chart that carries out the method for error correction according to the embodiment of the invention in set-top box.
Before all-multicast grouping in the FEC group all had been received, set-top box was waited for (S200).
When receiving the multicast grouping, the FEC header information of the multicast grouping that receives and the FEC header information that rigidly connects the multicast grouping of receiving are before compared, whether change to check the FEC group.Equation below satisfying means that this FEC group does not change.
{now(sequence_number)-pre(sequence_number)}
-{now(diff)-pre(diff)}＝0
Here, rigidly connect the x field of FEC header of the grouping of receipts before pre (x) expression, the x field of the FEC header of the grouping that now (x) expression is current.
When S201 step among Figure 10 judged that the multicast grouping belongs to identical FEC group, (MPEG TS) was stored in (not shown) in the TS buffer with digital broadcast data, and header information is stored in the FEC header buffer (S202).
When S201 step among Figure 10 judges that the multicast grouping does not belong to identical FEC group, the content in the FEC header buffer is compared mutually, to check in the FEC group whether have the grouping (S203) of losing.
When judge there is a grouping of losing in S203 step among Figure 10, forwards step S204 among Figure 11 to via recovering step S205, and forward step S204 to when not having lost packets or existing more than one lost packets when judging.
In the step S204 of Figure 10, digital broadcast data of current group (MPEG TS) and FEC header information are stored in separately the buffer, with the same at step S202, and the digital broadcast data (MPEG TS) of previous FEC group are sent to decoder.
Figure 11 is the flow chart of the process of the multicast grouping that is used to recover to lose in the S205 of Figure 10 step.
Notice that ' m ' is stored in first buffer.' m ' expression need to recover the numbering that the multicast in FEC district is divided into groups, its scope from 0 to " group_size-1 ".
The grouping that recovery is lost need with the relevant information of all other multicasts groupings in the same FEC group, use ' m ' expression here.
The position of the burst that ' P ' expression is resumed.That is to say, owing to when creating the FEC data, digital broadcast data (MPEG TS) is divided according to section length, so the number of the burst that is divided becomes group_size-1.Like this burst of Hua Fening as shown in Figure 7, " P " expression burst numbering here.
Notice that ' n ' also is stored in second buffer.' n ' expression recovers the counting of the required multicast grouping of digital broadcast data (MPEGTS) burst, scope from 0 to group_size-1.
Be the grouping that recovers to lose, ' P ' individual burst of specific cluster ' m ' recovers according to following process:
From ' m ' individual grouping, extract the FEC data, and extract the specific burst of digital broadcast data (MPEG TS) from all other grouping.Then, these data are carried out XOR to recover ' P ' individual burst.In this case, the multicast grouping except ' m ' individual multicast grouping is selected successively according to count value ' n '.
At first, counting ' m ' is set to ' 0 ' to select that the multicast m that divides into groups is stored in (S110) in first buffer.The order of the multicast grouping that this expression at first will be resumed is diff ' 0 '.
Expression will be stored in multicast grouping in first buffer ' m ' compares (S111) with the diff of the grouping of losing.
When in step S11, judging ' m ' diff, then the burst numbering P that equals ' m ' is appointed as the memory location (S114) of the 3rd buffer less than lost packets.
When in step S11, judging ' m ' diff, then the burst of ' m '-1 numbering P is appointed as the memory location (S113) of the 3rd buffer greater than lost packets.
The burst position of the grouping that is resumed is determined in step S113 and S114.
Then, judge that whether ' m ' be less than group_size (S115).
If ' m ' less than group_size, then is initialized as first buffer digital broadcast data (MPEG TS) burst of grouping m, and second buffer and ' n ' all are initialized as ' 0 ' (S117).
Then, whether judgement will be stored in multicast grouping ' n ' in second buffer less than group_size (S119).
If multicast grouping ' n ', is then judged the multicast grouping n that will be stored in second buffer less than group_size and whether is different from the diff (S121) of lost packets.
If will be stored in the diff that multicast grouping " n " in second buffer is different from lost packets, then the multicast grouping m that will be stored in first buffer be compared (S122) with the multicast grouping n that will be stored in second buffer.
If multicast grouping n is less than the multicast m that divides into groups, then (m-1) individual digital broadcast data (MPEG TS) burst that n multicast in the current FEC group divided into groups is stored in (S123) in second buffer.Remaining space to buffer fills ' 0 '.
On the other hand, if multicast grouping n greater than the multicast m that divides into groups, then m digital broadcast data (MPEG TS) burst that n multicast in the current FEC group divided into groups is stored in (S124) in second buffer.Remaining space to buffer fills ' 0 '.
Then, the content in first and second buffers is carried out XOR, and the result is stored in (S125) in first buffer.
Then, handle multicast grouping n+1 (S118).That is to say, the burst that extracts from next one grouping is stored in second buffer.
Execution in step S119, S121, S122, S123 or S124 and S125.When judging that at step S119 (judge multicast grouping ' n ' whether less than group_size) multicast grouping ' n ' is identical with group_size, then the information stores in first buffer in the position of P burst of the 3rd buffer (S120).That is to say that this digital broadcast data (MPEG TS) burst is resumed in a multicast grouping of FEC group.
Then, handle multicast grouping m+1 (S112).That is to say, the FEC data of next multicast grouping are recovered.
Then, this process forwards step S111 to,, ' m ' of the grouping of representing to be resumed and the diff of lost packets is compared herein.
Repeat above-mentioned steps.
When judging that at step S115 (judging that whether ' m ' be less than group_size) ' m ' is identical with group_size, then the content of the 3rd buffer is outputed to the TS buffer.That is to say, this means that all groupings of losing all are resumed.
When judging that at step S121 the divide into groups diff of n and lost packets of multicast that (the multicast grouping n that will be stored in second buffer is inequality with the diff of lost packets) will be stored in second buffer is identical, then multicast grouping n is increased progressively 1, make that this process forwards step S119 to then with next multicast packet memory (S118) in second buffer.This is to the next one executable operations of dividing into groups, because can not extract digital broadcast data (MPEG TS) burst from lost packets.
On the other hand, when judging that at step S122 (diff that will be stored in the multicast grouping m in first buffer is compared with multicast grouping n in will being stored in second buffer) multicast grouping n and the multicast m that divides into groups is identical, then multicast grouping n is increased progressively 1, make that this process forwards step S119 to then with next multicast packet memory (S118) in second buffer.This is to next multicast grouping executable operations, because it is identical with the multicast grouping that presents this burst to present the multicast grouping of FEC data.
As mentioned above, according to digit broadcasting system of the present invention and error correction method thereof, the FEC data that are used for lost packet recovery are included in the multicast grouping of FEC group and, thereby have alleviated network load its transmission.
The present invention is described with reference to typical embodiment, those skilled in the art will appreciate that under the prerequisite of the scope of the present invention that does not deviate from the claims qualification, can make various modifications in form and details.

Claims (11)

1, a kind of digit broadcasting system comprises:
Server, the multicast of predetermined quantity is divided into groups to obtain to be used for forward error correction (FEC) group of digital broadcast data (MPEG TS) transmission, use the digital broadcast data (MPEG TS) of the multicast grouping in the FEC group to create the FEC data for each multicast grouping, described FEC data are included in the multicast grouping, and transmit the multicast grouping that is produced by network; And
Set-top box, lose in response to the multicast grouping that receives by network, each digital broadcast data (MPEG TS) burst of the multicast grouping that digital broadcast data (MPEG TS) burst that divides into groups by the multicast except the multicast of losing is divided into groups recovers to lose, and the digital broadcast data that is recovered (MPEG TS) burst is carried out combination divide into groups with the multicast that recovers to lose.
2, the system as claimed in claim 1, wherein, described server comprises:
Acquisition is used for the multicast FEC group of digital broadcast data (MPEG TS) transmission;
The data sementation device carries out segmentation according to setting several digital broadcast datas (MPEG TS) to the multicast grouping in the FEC group;
The FEC data are provided with device, carry out segmentation according to setting several digital broadcast datas (MPEG TS) that multicast in the FEC group is divided into groups separately, come the FEC data to be set by the digital broadcast data (MPEG TS) of segmentation being carried out XOR (XOR) computing for each multicast grouping, described FEC data are included in the multicast grouping, and transmit the multicast grouping that is produced by network; And
The FEC header is provided with device, and stream ID, sequence number and the order of each multicast grouping in the FEC group is set, and described stream ID, sequence number and order are included in each multicast grouping.
3, system as claimed in claim 2, wherein, described set-top box judges whether there is the grouping of losing based on described sequence number.
4, a kind of server that is used for digit broadcasting system, described server comprises:
Forward error correction (FEC) group is provided with device, and the multicast of predetermined quantity is divided into groups to obtain to be used for the FEC group of digital broadcast data (MPEG TS) transmission;
The data sementation device carries out segmentation according to setting several digital broadcast datas (MPEG TS) to the multicast grouping in the FEC group; And
The FEC data are provided with device, carry out segmentation according to setting several digital broadcast datas to the multicast grouping in the FEC group, come the FEC data to be set by the digital broadcast data (MPEG TS) of segmentation being carried out XOR (XOR) computing for each multicast grouping, described FEC data are included in the multicast grouping, and transmit the multicast grouping that is produced by network.
5, server as claimed in claim 4 also comprises: the FEC header is provided with device, and stream ID, sequence number and the order of each multicast grouping in the FEC group is set, and described stream ID, sequence number and order are included in each multicast grouping.
6, a kind of set-top box that is used for digit broadcasting system, described set-top box comprises:
The mistake determinant judges based on the sequence number that comprises in the multicast grouping whether any multicast grouping that receives by network loses;
At least one buffer; And
The error correction device divides into groups by the multicast that forward error correction (FEC) data of recovering the multicast grouping except the multicast grouping of losing in the FEC group are recovered to lose.
7, set-top box as claimed in claim 6, wherein, the inspection of described error correction device has the multicast grouping of the FEC data that will recover and the position of digital broadcast data (MPEG TS) burst that this multicast is divided into groups, described FEC storage in first buffer, extraction recovers required each digital broadcast data (MPEG TS) burst the multicast grouping from the multicast grouping of the FEC data of storing except having and the multicast grouping of losing, and to each digital broadcast data that extracts (MPEG TS) burst and the FEC data execution XOR that is stored in first buffer, with P digital broadcast data (MPEG TS) burst of the multicast grouping that recovers to lose, and
Each digital broadcast data (MPEG TS) burst that described error correction device divides into groups by the multicast that the FEC data of the multicast grouping except the multicast grouping of losing in the FEC group further recover to lose, and digital broadcast data (MPEG TS) burst that is recovered carried out combination, with the digital broadcast data (MPEG TS) of the multicast grouping that recovers to lose.
8, a kind ofly at digit broadcasting system the method for error correction information is set in server, described method comprises:
Multicast to predetermined quantity is divided into groups, to obtain to be used for the FEC group of digital broadcast data (MPEGTS) transmission;
Carry out segmentation according to setting several digital broadcast datas (MPEG TS) to the multicast grouping in the FEC group; And
Carry out segmentation according to setting several digital broadcast datas (MPEG TS) to the multicast grouping in the FEC group, use the digital broadcast data (MPEG TS) of segmentation forward error correction (FEC) information to be set for each multicast grouping, described FEC data are included in the multicast grouping, and transmit the multicast grouping that is produced by network.
9, method as claimed in claim 8, wherein, carry out segmentation according to setting several digital broadcast datas (MPEG TS) to the multicast grouping in the FEC group, use the digital broadcast data (MPEG TS) of segmentation the FEC data to be set for each multicast grouping, described FEC data are included in the multicast grouping, and comprise: carry out XOR (XOR) computing by digital broadcast data (MPEG TS), for each multicast grouping is provided with the FEC data to segmentation by the step that network transmits the multicast grouping that is produced.
10, method as claimed in claim 8 also comprises: stream ID, sequence number and the order of each multicast grouping in the FEC group are set, and described stream ID, sequence number and order are included in each multicast grouping.
11, a kind of method of in the set-top box of digit broadcasting system, carrying out error correction, described method comprises:
Based on the sequence number that is included in each multicast grouping, judge whether any multicast grouping that receives by network loses;
Digital broadcast data (MPEG TS) burst that the multicast that recovers to lose by the FEC data of the multicast grouping except the multicast grouping of losing in the EFC group is divided into groups, the digital broadcast data that is recovered (MPEG TS) burst is carried out combination, with the multicast grouping that recovers to lose.
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