CN1181688C

CN1181688C - Mapping method for digital communication system

Info

Publication number: CN1181688C
Application number: CNB01808155XA
Authority: CN
Inventors: M・菲莫夫; M·菲莫夫
Original assignee: Zenith Electronics LLC
Current assignee: Zenith Electronics LLC
Priority date: 2000-04-18
Filing date: 2001-03-27
Publication date: 2004-12-22
Anticipated expiration: 2021-03-27
Also published as: AU2001249482A1; CN1423901A; WO2001078494A3; HK1055870A1; WO2001078494A2; MXPA02010201A

Abstract

A receiver receives a digital signal. The digital signal contains a frame of robust VSB data and ATSC data, and the digital signal further contains a map. The map contains information indicating a location of the robust VSB data and ATSC data in the frame. A decoder of the receiver decodes the digital signal. A processor of the receiver processes at least one of the robust VSB data and the ATSC data according to the location information contained in the map.

Description

The mapping of digital communication system is arranged

Related application

The application requires the interests of following U.S. Provisional Application: the No.60/198 that on April 18th, 2000 submitted to, the No.60/255 that on December 13rd, 014 and 2000 submitted to, 476.

TECHNICAL FIELD OF THE INVENTION

The present invention relates to emission and/or receiving digital data.

Background of invention

In the U.S., the standard of emission digital television signal is 8VSB data (ATSC digital television standard A/53).This 8VSB data are by a kind of general layout of being made up of 8 symbol level.In the VSB system, these 8 equal homophases of symbol level.But in the QAM system, all code elements are launched with phase quadrature relationship.

Above-mentioned standard code the form and the modulation of digital audio/video data.Be launched data code fetch n-ary form n, each code element is represented two bits, and is become three trellis coding data by trellis coding.Per three trellis coding data map become a code element, have a corresponding level in 8 level.Reed/solomon encoder and alternating method also can strengthen the robustness of the information of being launched.

Auxiliary data (nonnumeric audio, video data) also can be launched in digital TV channel, and these data format and modulation with same method by this standard as audio, video data.Read bag sign (PID) by the reception function of 8VSB standard manufacture, and the bag sign allows the reception function distinguish voice data, video data and auxiliary data.

Yet, be enough to receive although be launched the robustness of digital television signal for Digital Television, may not be enough to launch auxiliary data, especially true when auxiliary data is important.Therefore, one of application of the present invention is with VSB form emission auxiliary data, utilizes outer coding to strengthen robustness.Here the auxiliary data by this application emission of the present invention is called sane VSB data (RVSB).

Summary of the invention

In one aspect of the invention, a kind of method may further comprise the steps: receive a frame that comprises first and second fields, first and second fields have frame sync segment and a plurality of data segment separately, wherein data segment comprises the first and second identical data of general layout, first data and second data are corresponding to different data bit numbers, first field comprises current mapping and count information, second field comprises next mapping and count information, the position of current mapping indication at least the first data in present frame, the position of next mapping indication at least the first data in the future frame, and the number of count information indication frame before next mapping becomes current mapping; And respond current mapping, handle at least the first data in the present frame.

In said method, current mapping and count information are included in same section of first field, and next mapping and count information are included in same section of second field.

In said method, the section that comprises current mapping and count information comprises data segment, and the section that comprises next mapping and count information comprises data segment.

In said method, further comprising the steps of: as to keep the count value that becomes the time correlation of current mapping with next mapping; With count down from described count value according to frame time.

In said method, the coding ratio of second data in present frame also indicated in current mapping, and the coding ratio of second data in next frame also indicated in next mapping.

In said method, data segment comprises the 3rd data, wherein first, second has identical general layout with the 3rd data, first data, second data and the 3rd data are corresponding to different data bit numbers, current mapping also indicate corresponding to second data in present frame first coding ratio and corresponding to second coding ratio of the 3rd data in present frame, next mapping also indicate corresponding to second data in the future frame first coding ratio and corresponding to second coding ratio of the 3rd data in the future frame.

In said method, first data comprise the ATSC data, and second data comprise sane VSB data.

In said method, sane VSB data comprise the sane VSB data of 1/2 rate code.

In said method, sane VSB data comprise the sane VSB data of 1/4 rate code.

In said method, data segment comprises the 3rd data, wherein first, second has identical general layout with the 3rd data, first data, second data and the 3rd data are corresponding to different data bit numbers, second data comprise the first sane VSB data, and the 3rd data comprise the second sane VSB data.

In said method, the first sane VSB data comprise the sane VSB data of 1/2 rate code, and the second sane VSB data comprise the sane VSB data of 1/4 rate code.

Brief description

Study content of the present invention in conjunction with the drawings in great detail, all features and advantage will be clearer, in the accompanying drawing:

Fig. 1 illustrates the sane vsb transmitter of launching sane VSB data and ATSC data by the present invention;

Fig. 2 illustrates the common ATSC receiver that receives the ATSC data of sane vsb transmitter emission among Fig. 1;

Fig. 3 illustrates the sane vsb receiver that receives the sane VSB data of sane vsb transmitter emission among Fig. 1;

Fig. 4 illustrates in greater detail 2/3 rate encoder of Fig. 1;

Fig. 5 illustrates the mapping function that mapper is carried out among Fig. 4;

Fig. 6 illustrates the operation of 2/3 ratio decoder in Fig. 2 and 3;

Fig. 7 illustrates another sane vsb transmitter of launching sane VSB data and ATSC data by the present invention;

Fig. 8 illustrates the common ATSC receiver that receives the ATSC data of sane vsb transmitter emission among Fig. 7;

Fig. 9 illustrates the sane vsb receiver that receives the sane VSB data of sane vsb transmitter emission among Fig. 7;

Figure 10 is illustrated in the circuit that produces the relevant controlling signal on the control line that abandons of Fig. 9;

Figure 11 illustrates the another sane vsb transmitter of launching sane VSB data and ATSC data by the present invention;

Figure 12 illustrates an example and comprises four data segments of sane vsb transmitter by the outer coded data of 1/2 ratio of the present invention's emission;

Figure 13 illustrates an example and comprises four data segments of sane vsb transmitter by the outer coded data of 1/4 ratio of the present invention's emission;

Figure 14 illustrates an example and comprises four data segments of sane vsb transmitter by the outer coded data of 3/4 ratio of the present invention's emission;

Figure 15 is shown in further detail the interleaver (Ir) among Fig. 1,9 and 11;

Figure 16 is shown in further detail the deinterleaver (Dr) in Fig. 3 and 9;

Figure 17 illustrates the mapping definition structure of the first sane VSB packet in the frame;

Figure 18 illustrates the frame sync segment of a part of frame, and the mapping of carrying indicates the place that can find sane VSB data in this frame;

Figure 19 illustrates the enhanced data sheet fallout predictor of one embodiment of the invention;

Figure 20 illustrates the graticule mesh layout of internal layer decoding among Figure 19;

Figure 21 illustrates the possible state exchange of Figure 19 ectomesoderm decoder;

Figure 22 illustrates the enhanced data sheet fallout predictor of another embodiment of the present invention.

Describe in detail

Transmitting and receiving of RVSB and ATSC data

Fig. 1 illustrates by the sane vsb transmitter 10 of one embodiment of the invention emission ATSC data with sane VSB data, Fig. 2 illustrates the common ATSC receiver 12 of the ATSC data that receive sane vsb transmitter 10 emissions, and Fig. 3 illustrates the sane vsb receiver 14 of the sane VSB data that receive sane vsb transmitter 10 emissions.

Sane vsb transmitter 10 comprises Reed/solomon encoder device 16, by Reed/Suo Luomen parity bytes is added to noncoding auxiliary data byte to its coding.Non-coding auxiliary data byte and Reed/Suo Luomen parity bytes is staggered with interleaver 18, and outer then layer coder 20 usefulness convolution codes or other error correcting code are made coding by turn to them.Outer layer coder 20 has improved the robustness of non-coding auxiliary data byte and Reed/Suo Luomen parity bytes, and they are converted to robust data byte (calling sane VSB data byte in the following text) and Reed/Suo Luomen parity bytes.

For example, outer layer coder 20 can be to 1/2 rate encoder of each input two carry-out bits of generation, each is imported 1/4 rate encoder that the position produces four carry-out bits, perhaps imports 3/4 rate encoder of four carry-out bits of generation to per three.Also available other encoder replaces.

The output of layer coder 20 outside adds that to the sane VSB data of every group of 184 codings and Reed/Suo Luomen byte three bytes carry (tx) head, forms sane VSB packet.Multiplexer 24 carries the ATSC packet (being generally the voice data video data) of head and 184 byte ATSC data multiplexing these sane VSB packets and each self-contained three byte.Can select the input of multiplexer 24 by principle packet-by-packet, and ATSC transmitter 26 is supplied with in the input of each selection.24 pairs of ATSC transmitters 26 of multiplexer are selected and recommended input and are mapped as the basis with the following sane VSB that will describe.

ATSC transmitter 26 generally comprises layer coder 32 in Reed/solomon encoder device 28, interleaver 30 and 2/3 ratio, all according to the ATSC standard operation.

Common ATSC receiver such as the common ATSC receiver 12 of Fig. 2, is used for receiving and handling the ATSC data, abandons sane VSB data.Correspondingly, this receiver 12 comprises 2/3 ratio internal layer decoder 34, deinterleaver 36 and the Reed/Suo Luomen decoder 38 by the ATSC standard operation.Yet common ATSC receiver 12 is programmed to decipher ATSC data and sane VSB data delivery head (comprise sign or PID, and do not encoded by outer layer coder 20).This receiver 12 reads the PID of all bags, at 40 bags that abandon the PID with sane VSB data.This receiver 12 comprises that also one sends the data slice fallout predictor 42 (as U.S. Patent No. 5,923, the 711 data slice fallout predictors that disclose) of phase tracker and/or equalizer back in response to the internal layer decoding data and with output, as well known in the art.

Sane VSB packet can receive, decipher and handle with sane vsb receiver 14 shown in Figure 3.As shown in Figure 4, layer coder 32 comprises precoder 44 and four attitude trellis encoder 46 in 2/3 ratio of ATSC transmitter 26, and the two can regard a kind of eight attitude encoders altogether as, to per two input position (Xl, X2) produce three trellis codings carry-out bit (Z0, Z1, Z2).Mapper 48 is mapped to the code element with one of eight level shown in Figure 5 to three trellis coding carry-out bits.By the convolution code theory as can be known, can regard the operation of precoder 44 and four attitude trellis encoder 46 the 4 yuan of graticule mesh layouts of as eight attitudes.

Therefore in sane vsb receiver 14,2/3 ratio internal layer decoder 50 can carry out work by the graticule mesh layout of eight attitudes unit, image pattern 6 is watched four attitude trellis encoder 46 of layer coder 32 in

precoder

44 and 2/3 ratio like that altogether, to make soft output judgement (as using Li, Vusetic and Sato at " Optimum soft Output Detection for Channels with IntersymobolInterference " (IEEE Transactions on Informat ion Theory, May, 1995) the middle SSA algorithm of describing).This soft-decision operation is more complicated than the Viterbi algorithm of the generation hard decision output of widespread usage, but the coding gain that has utilized outer layer coder 20 to provide more fully.

The output of 2/3 ratio internal layer decoder 50 is removed staggered by deinterleaver 52.Sane vsb receiver 14 reads the PID of all packets at deinterleaver 52 outputs.According to these PID, receiver 14 abandons the packet that those have ATSC data PID 54, also abandons the conveying head and the Reed/solomon encoder device 28 added parity bytes that are added in outer layer coder 20 back.Like this, the sane VSB packet of receiver 14 sane VSB data of layer coder 29 codings outside 54 transmission comprise.In order to rebuild the original non-coding auxiliary data that offers Reed among Fig. 1/solomon encoder device 16, this sane VSB packet is by outer decoder 56 decodings, staggered by deinterleaver 58 (inverted interleaver 18) releasing, and make Reed/Suo Luomen by Reed/Suo Luomen decoder 60 and decipher.

For the order recovery of outer decoding data to the order of data in channel, interleaver 62 (corresponding to interleaver 30) is exported (available soft or hard output) reliably to outer decoder 56 and is interlocked.This staggered outer decoding data can be used for phase tracker and/or equalizer are produced feedback reliably by for example data slice fallout predictor 66.Yet total feedback delay that deinterleaver 52 and interleaver 62 cause in the sane vsb receiver 14 is long, generally can't provide the feedback of usefulness to phase tracker and/or equalizer.

The deinterleaver 52 of sane vsb receiver 14 and the feedback delay that interleaver 62 causes have been avoided in configuration shown in Fig. 7-9.In sane vsb transmitter 80 shown in Figure 7, noncoding auxiliary data byte is by Reed/solomon encoder device 82 codings, and this encoder 82 is added to Reed/Suo Luomen parity bytes in the noncoding auxiliary data byte.Interleaver 84 is staggered with noncoding auxiliary data byte and Reed/Suo Luomen parity bytes, and outer then layer coder 86 utilization convolution codes or Turbo product code are encoded by turn to it, as mentioned above.For reducing the influence of channel burst error to skin decoding, the output by turn of outer layer coder 86 is small data pieces that small data piece interleaver 88 interlocks.The data that small data piece interleaver 88 provides are called Rdata (n.o.), the sane VSB data of the normal ordering of representative.

Input of first multiplexer 92 receives the packet of ATSC form, and each packet comprises that (i) carries head, (ii) 184 placeholder bytes and (iii) 20 placeholder bytes of emulation ATSC Reed/Suo Luomen odd and even data of the sane VSB data of emulation with effective three bytes of sane VSB data PID number.Another input of first multiplexer 92 receives the ATSC form emulated data bag of the emulation ATSC data of each self-contained 207 byte.These ATSC form simulation package play the effect of placeholder to the actual ATSC packet of preparing to be added to the downstream.These inputs of first multiplexer 92 can be selected for use by principle packet-by-packet, and the sane VSB that this selection will be described with the back is mapped as the basis.

The output that interleaver 94 is selected by staggered first multiplexer 92 of the ATSC standard of convolution byte-interleaving.Data replacement device 96 receives the two output of interleavers 94 and small data piece interleaver 88, decimally according to the sane VSB data of each emulation placeholder byte of the sane VSB data byte displacement interleaver 94 of the next normal ordering of piece interleaver 88.

The output of data replacement device 96 comprises the sane VSB data of normal ordering, has conveying head, emulation ATSC Reed/Suo Luomen parity bytes and the emulation ATSC data packet byte of distribution.By the output release of an interleave of 98 pairs of data displacers 96 of deinterlacer of byte release of an interleave ATSC standard operation, thus these data effectively " repackings " become the bag of forming by sane VSB data (Rdata (r.o.)), emulation ATSC Reed/Suo Luomen parity bytes and the emulation ATSC data of conveying head, rearrangement.Normal rearrangement of resetting sane VSB data realizes by the release of an interleave of deinterlacer 98, and the data of resetting can be described as the sane VSB data of rearrangement.

Emulation ATSC Reed/Suo Luomen parity bytes of sane VSB bag (20 of each bags) and emulation ATSC packet (respectively wrapping 207 bytes) abandon second multiplexer 102 100.(the sane VSB data of each self-contained delivery head portion and rearrangement and actual ATSC packet multiplexing, the latter is contained the conveying head and the ATSC data of 187 bytes respectively remaining sane VSB bag.Arbitrary input of second multiplexer 102 can and be supplied with ATSC transmitter 104 by principle selection packet-by-packet.Which input second multiplexer 102 selects pass to ATSC transmitter 104, is mapped as the basis with the following sane VSB that will describe.

ATSC transmitter 104 generally comprises all by layer coder 110 in Reed/solomon encoder device 106, interleaver 108 and 12 road directions, 2/3 ratio of ATSC standard operation.106 outputs of Reed/solomon encoder device are by carrying head, the sane VSB data of rearrangement and the bag that the ATSC Reed/the Suo Luomen parity bytes is formed, and by carrying head, ATSC data and cladding usefulness that the ATSC Reed/the Suo Luomen parity bytes is formed.ATSC Reed/Suo Luomen the parity bytes of sane VSB data is calculated according to the sane VSB data of resetting.In addition, interleaver 108 changes the ordering of sane VSB data, and the sane VSB data that make interleaver 108 outputs still are the sane VSB data of normal ordering.Interleaver 108 also scatters carries head, ATSC Reed/Suo Luomen parity bytes and this ATSC data.These data are done to launch after 2/3 rate code by layer coder in 12 road directions, 2/3 ratio 110.The sane VSB data of emission are normal sequence, i.e. the order that provides at small data piece interleaver 88 outputs, thus allow sane vsb receiver avoid the deinterlacer 52 of sane vsb receiver 14 and the delay that interleaver 62 causes.

As shown in Figure 8, common ATSC receiver 120 comprises 12 road directions, 2/3 internal layer decoder 122, it is done decoding and an output stream is provided the data of emission, comprise normal ordering robust data, and the ATSC convolution byte-interleaving location of carrying head, ATSC data and ATSC Reed/Suo Luomen parity bytes to provide by interleaver 108 is provided.ATSC deinterlacer 124 carries these head, ATSC data and ATSC Reed/Suo Luomen parity bytes to return to their conveying " packing " position.The sane VSB data that the sane VSB data transaction that ATSC deinterlacer 124 also will normally sort becomes to reset, this rearrangement form allows the ATSC Reed/Suo Luomen decoder 126 of common ATSC receiver 120 correctly to test the parity of sane VSB packet.Then, common ATSC receiver 120 reads this sane VSB packet and carries head, and moderately abandons sane VSB packet 128 by its PID.

As shown in Figure 9, sane vsb receiver 130 comprises soft output 12 road directions 2/3 ratio internal layer decoder 132.The output of (exporting 2/3 decoder meeting significantly sacrificing coding gain firmly) soft output 12 road directions 2/3 ratio internal layer decoder 132 comprises the sane VSB data of normal ordering, and the ATSC data of resetting, conveying head and ATSC Reed/Suo Luomen parity symbols are dispersed in these sane VSB data, and the position is indicated by the following control circuit 134 that abandons.Abandoning under control circuit 134 controls, abandoning ATSC data, conveying head and ATSC Reed/Suo Luomen parity symbols that piece 136 abandons rearrangement.

138 pairs of sane VSB data release of an interleaves of small data piece deinterlacer, its time-delay is short relatively.This release of an interleave is dispersed in possible burst error in the sane VSB data at the output of soft output 12 road tm 2/3 ratio internal layer decoder 132.Outer decoder 140 bit by bit decodings are the sane VSB data of ordering normally, also these sane VSB data are formed byte.At R _MAPData input pin provides amp information to outer decoder 140, tells which kind of decoding rate this decoder 140 uses to which kind of data.In that phase tracker and/or equalizer are provided in the sane vsb receiver 130 of low total feedback delay, neither need deinterlacer 52, do not require interleaver 62 yet.For example, enhanced data sheet fallout predictor 142 can produce feedback to phase tracker and/or equalizer with the data of outer decoding.Need, can should feed back by gating, perhaps regulate the stride of equalizer gradient algorithm pro rata with the reliability of decoding data.

For rebuilding the original noncoding auxiliary data of supplying with Reed/solomon encoder device 82 among Fig. 7, the sane VSB packet pay(useful) load of outer decoder 140 decodings is by deinterlacer 144 (inverted interleaver 84) release of an interleave, and does Reed/Suo Luomen decoding by Reed/Suo Luomen decoder 146 (corresponding to Reed/solomon encoder device 82).

As the ATSC prescribed by standard, frame comprises a plurality of sections, and each section contains the byte of predetermined number.First section of frame is frame sync segment, and remaining section is a data segment.Though sane VSB data can be with all section or segment section emission, section emission in pairs is convenient.Which section above-mentioned sane VSB mapping indicates to comprising sane VSB data, thereby abandons piece 136 and can correctly before the ATSC data of resetting arrive outer decoder 140 it be abandoned.Abandon conveying head and ATSC Reed/Suo Luomen odd and even data that piece 136 also must abandon all sections (sane VSB and ATSC).

Figure 10 is illustrated in to abandon and produces the relevant controlling signal is simplified circuit and sane vsb receiver 130 with the theory of control discard relevant portion on the control circuit 134.When setting up emulation 207 byte section, map information (emission and the method for reseptance of map information describe below) the control emulation section generator 150 that sane vsb receiver 130 usefulness are received, and the latter also uses frame synchronizing signal.To each ATSC emulation section, emulation section generator 150 is set to FF to all bytes.To each sane VSB data simulation section, emulation section generator 150 is carrying head and ATSC Reed/Suo Luomen parity bytes to be set to FF.Generator 150 is set to 00 with all the other bytes of each sane VSB data simulation section.

Emulation section generator 150 is these emulation sections ATSC convolution byte-interleaving device 152 of feeding, output control with the latter abandons piece 136 then, and abandons piece 136 in response to FF and 00 yard ATSC data, conveying head and ATSC Reed/Suo Luomen odd and even data that correctly is discarded in rearrangement staggered in the data flow of receiving.Therefore, abandon 136 of pieces and transmit these sane VSB data.

Figure 11 illustrates the sane vsb transmitter 160 of a kind of multiple outer code, and its class of operation is similar to the sane vsb transmitter 80 of Fig. 7.This transmitter 160 has and Reed/Suo Luomen parity bytes is added in the first non-coding auxiliary data and to the first Reed/solomon encoder device 162 of its coding, Reed/Suo Luomen parity bytes is added in the second non-coding auxiliary data second Reed/solomon encoder device 164 to its coding, and Reed/Suo Luomen parity bytes is added in the 3rd non-coding auxiliary data the 3rd Reed/solomon encoder device 166 to its coding.First, second and the 3rd non-coding auxiliary data through Reed/solomon encoder are interlocked with first, second and the 3rd interleaver 168,170 and 172 respectively.Then, first, second of Jiao Cuo Reed/solomon encoder and the 3rd non-coding auxiliary data are encoded by turn by first, second and the 3rd outer layer coder 174,176 and 178 respectively.First, second and the 3rd outer layer coder 174,176 and 178 output are by turn interlocked by first, second and the 3rd small data piece interleaver 180,182 and 184 respectively.

The first outer layer coder 174 is 1/4 rate encoder, and the second outer layer coder 176 is 1/2 rate encoder, and the 3rd outer layer coder 178 is 3/4 rate encoder, though can use any other combination of the different all outer layer coder of encoding rate.Selecting (this input is determined different outer coded datas are inserted the order of preparing in the frame emissions) under the input control, multiplexer 186 selects the data of first, second and the 3rd small data piece interleaver 180,182 and 184 to export.The data of multiplexer 186 outputs are called Rdata (n.o.), as before, and the sane VSB data of the normal ordering of representative.

Top three inputs of multiplexer 190 receive ATSC form bag, respectively be surrounded by effective three bytes and carry head, have the ATSC Reed/Suo Luomen odd and even data of the sane VSB data of emulation and the 20 emulation placeholder bytes of sane VSB data PID number, 184 placeholder bytes.The sane VSB data of multiplexer 190 the top inputs are corresponding to 1/4 rate code data of the first outer layer coder 174, the sane VSB data of its next input are corresponding to 1/2 rate code data of the second outer layer coder 176, its more sane VSB data of next input corresponding to 3/4 rate code data of the 3rd outer layer coder 178.Supply with the data of multiplexer 190 bottommost inputs, comprise the ATSC form simulation package that respectively comprises 207 byte emulation ATSC data.These emulation ATSC packet plays the effect of placeholder to the actual ATSC packet of preparing to be added to multiplexer 190 downstreams.According to the input of selecting on the circuit, by the input of the multiplexer 190 of principle selection packet-by-packet.This selection is based on the following sane VSB data map that will describe.

For realizing correct ATSC convolutional interleaving encoding, the output of 192 pairs of multiplexers 190 of interleaver interlocks.Data replacement device 194 receives the two output of interleavers 192 and multiplexer 186.Data replacement device 194 is used for from each emulation sane VSB data placeholder byte of multiplexer 186 next corresponding normal sane VSB data byte displacements of sorting from multiplexer 190.

The output of data replacement device 194 comprises the sane VSB data (suitably through 1/4 rate code, 1/2 rate code and/or 3/4 rate code) of normal ordering, conveying head, emulation ATSC Reed/Suo Luomen parity bytes and emulation ATSC data packet byte that band scatters.Convolution byte deinterlacer 196 (as the ATSC standard to describe) is to the output release of an interleave of data displacer 194, effectively these data " repacking " are become the bag of being made up of sane VSB data (through 1/4,1/2 and/or 3/4 rate code), emulation ATSC Reed/Suo Luomen parity bytes and the ATSC data simulation bag of carrying head, rearrangement.The sane VSB data of the rearrangeable normal ordering of release of an interleave effect of deinterlacer 196.

The mode of abandoning emulation ATSC Reed/Suo Luomen parity bytes (20 of every bags) and emulation ATSC packet (every bag 207 bytes) at 198 Lost is similar to the mode that abandons control circuit 134 among Fig. 9 and abandon piece 136.Multiplexer 200 is the remaining sane VSB bag that comprises the sane VSB data of carrying head and rearrangement separately and comprise the conveying head of 187 bytes and the actual ATSC packet multiplexing of ATSC data.Arbitrary input of multiplexer 200 is by principle selection packet-by-packet and offer the ATSC transmitter.Which input multiplexer 200 selects pass to ATSC transmitter 202, is mapped as the basis with the following sane VSB that will describe.

ATSC transmitter 202 generally comprises all by layer coder 208 in Reed/solomon encoder device 204, interleaver 206 and 12 road directions, 2/3 ratio of ATSC standard operation.204 outputs of Reed/solomon encoder device are by carrying head, the sane VSB data of rearrangement and the bag that the ATSC Reed/the Suo Luomen parity bytes is formed, and by carrying head, ATSC data and cladding usefulness that the ATSC Reed/the Suo Luomen parity bytes is formed.According to the sane VSB data of this rearrangement, sane VSB data are calculated ATSC Reed/Suo Luomen parity bytes.In addition, interleaver 206 changes the order of these sane VSB data, makes the sane VSB data of interleaver 206 outputs still be the normal sane VSB data that sort.Interleaver 206 also scatters carries header byte, ATSC Reed/Suo Luomen parity bytes and ATSC data.These data are emission behind layer coder 208 codings in 12 road directions, 2/3 ratio.The sane VSB data of emission are normal sequence, i.e. the order of stipulating at multiplexer 186 outputs.This normal data makes sane VSB receive the delay that can avoid deinterlacer 52 and interleaver 62 to cause in proper order.

As mentioned above, the ATSC frame comprises a frame sync segment and a plurality of data segment, for simplicity, sane VSB packet is dressed up 4 sections group.Particularly, Figure 12 illustrates an example can be used for launching 4 data segments through the sane VSB data of 1/2 rate code in frame, Figure 13 illustrates an example can be used to launch 4 data segments through the sane VSB data of 1/4 rate code in frame, can be used to launch 4 data segments through the sane VSB data of 3/4 rate code and Figure 14 illustrates an example in frame.These examples are represented the frame in interleaver 108 fronts, and suppose that 4 every group sane VSB data segments comprise integer sane Reed/solomon encoder data block, each data block length 184 byte, and it is parity bytes that 20 bytes are arranged.

For the outer coding of 1/2 ratio, Figure 12 illustrates this outer layer coder to two of each input position outputs.A pair of data segment is packed (one of each code element) to a sane VSB packet as a RVSB Reed/rope sieve gated data piece, so for the outer coding of 1/2 ratio, 4 sections comprise two sane Reed/solomon encoder data blocks.As shown in figure 13, for the outer coding of 1/4 ratio, this outer layer coder is to four of each input position outputs.Per four data segments are packaged as a RVSB Reed/rope sieve gated data piece (1/2 of each code element) to sane VSB data, so for the outer coding of 1/4 ratio, 4 sections comprise a sane Reed/solomon encoder data block.As shown in figure 14, for the outer coding of 3/4 ratio, this outer layer coder is to four of each three input position outputs, and the code element and the byte boundary of emission this moment always do not mate.Yet three complete RVSB Reed/rope sieve gated data pieces will be packaged into 4 data segments (1.5 of each code elements) exactly, so for the outer coding of 3/4 ratio, 4 sections comprise three sane Reed/solomon encoder data blocks.

Correspondingly, available following table representative graph 12-14:

S	X	Y
S	X	Y		1/2	1	2
1/4	1	4		1/2	1	2
1/4	1	4	3/4	3	4

X represents the quantity of complete sane Reed/solomon encoder data block in the table, and the Y representative obtains the required frame hop count amount of sane Reed/solomon encoder data block respective numbers X.

But should be understood that the present invention can be used in combination other coding ratio, thereby upward table will become by the specific coding ratio that uses.

Figure 15 has been shown in further detail interleaver 18,84,168,170 and 172, and Figure 16 shows in detail deinterlacer 58 and 144, supposes sane Reed/solomon encoder data block 184 byte longs of hanking.Interleaver 18,84,168,170 and 172 is convolutional interleaving encoding devices of B=46, M=4, N=184, sane VSB data is done byte-by-byte staggered.The ATSC interlace scheme of describing in this interlace scheme and ATSC digital television standard A/53 and the ATSC digital television standard A/54 guide for use is identical, and the B parameter that is sane interleaver is 46, is not 52, and parameter N is 184 rather than 208.This interleaver is essential, even ATSC deinterlacer (Da) by bypass, also can make sane vsb receiver overcome long noise burst pulse on the channel, as shown in Figure 9.

As shown in figure 16, deinterlacer 58 and 144 is convolutional interleaving encoding devices of B=46, M=4, N=184, and sane VSB data are made byte-by-byte release of an interleave.This release of an interleave scheme is also identical with the ATSC deinterlacer scheme described in ATSC digital television standard A/53 and the ATSC digital television standard A/54 guide for use, and the B parameter that is sane deinterlacer is 46, is not 52, and parameter N is 184 rather than 208.

Because sane VSB Reed/rope sieve gated data piece comprises 184 bytes, and Frame has integer sane VSB Reed/rope sieve gated data piece, so in a Frame, sane VSB data byte adds that the quantity of sane VSB Reed/Suo Luomen parity bytes always can be divided equally by 46.Therefore, for the deinterlacer in the receiver 58 and 144 (Dr), can be with frame sync segment as according with synchronously, no matter how the G value (describes below).During frame synchronization, force deinterlacer commutation symbol to enter tip position.Deinterlacer 58 and 144 is byte-by-byte deinterlacer.

Data map

As mentioned above, each Frame is mixed with sane VSB data segment and ATSC (non-sane coding) data segment.Moreover sane VSB data can comprise the data with the hybrid coding rate code.Sane vsb receiver 14 or 130 must have the mapping of sane VSB, indicates which section and is sane VSB coding, and which outer code is used for sane VSB coding, makes sane vsb receiver 14 or 130 can correctly handle sane VSB data and abandons the ATSC data.Sane vsb transmitter 10,80 and 160 also shines upon with this sane VSB controls its corresponding multiplexing and discard.Sane vsb transmitter 10,80 or 160 sends to sane vsb receiver 14 or 130 to this sane VSB mapping with all other data, and method is as follows.

With specific outer code in addition in the coded data frame, existence, quantity and the position of sane VSB data be by one or more several Sc indications, these count Sc in the frame synchronization of Frame as two level datas appearance.As everyone knows, frame sync segment is first section in the frame, so for above-mentioned skin coding (1/4,1/2 and 3/4 ratio), frame sync segment should preferably comprise [S _1/4, S _1/2, S _3/4].With each Sc such as S _1/4Or S _1/2Or S _3/4Be encoded to 18 code elements (position) of data.To all three kinds of sign indicating numbers, be with ading up to the mapping that 3 * 18=54 code element defines this sane VSB.These code elements are inserted near each frame sync segment end reserved area (just in front, 12 precoding positions).To every group of 18 (b ₁₈B ₁), back 6 (B ₆B ₁) represent in the present frame 8 sections group number G (according to outer code, 8 sections=2,4 or 6 sane VSB packets) as sane VSB data map.These 12 precoding positions are used for comb filter compensation (seeing ATSC digital television standard A/54 guide for use).Therefore as shown in figure 18, position b ₈B ₁Representative data G, position b ₁₈B ₁₃Be a b ₆B ₁Complement code, and the position b ₁₂B ₇Can be alternately+1 and-1 (or any alternate manner).

If S=S _1/4+ S _1/2+ S _3/4Because 312/8=39 is mapped as sane VSB data or 8VSB data (ATSC data) so 0-39 can be organized 8 sections.Therefore, the value of each Sc can be 0 ... 39, as long as itself and S≤39.

Sane VSB data segment preferably distributes in Frame as far as possible equably.For example, if S=1 just is mapped as sane VSB data segment to following 8 sections, and all other sections are mapped as the ATSC data segment: 1,40,79,118,157,196,235 and 274.If S=2 then is mapped as sane VSB data segment to following 16 sections, and all other sections are mapped as the ATSC data segment: 1,20.39,58,77,96,115,134,153,172,191,210,229,248,267 and 286.These examples proceed to S=39 always, and whole Frame all is mapped as sane VSB data segment.To some S value, the sane right best heterogeneity in interval of VSB data segment.But for any S value, the interval is predetermined fixed all, is known to all receivers.

If frame contains the sane VSB data that three outer layer coder that work in 1/4 ratio, 1/2 ratio and 3/4 ratio provide, then can in frame, cut apart data from these three encoders, thereby to the RVSB section, first 8 * S _1/4Section contains the outer coded data of 1/4 ratio, next 8 * S _1/2Section contains the outer coded data of 1/2 ratio, and 8 last * S _3/4Section contains the outer coded data of 3/4 ratio.Yet the outer layer coder of other type of these three outer layer coder or Any Digit also can have other sane VSB data segment structure.

As mentioned above, because this sane VSB and mapping be included in the frame sync segment, so this mapping is not enjoyed and the sane the same coding gain level of VSB data.Yet sane vsb receiver is mapped in relevant on the frame of some quantity by making sane VSB, still can obtain this mapping reliably, therefore not frequent variation (as being no more than every about 60 frames) of this mapping.

Above-mentioned reflection method reliably and simply obtains the mapping of sane VSB by receiver utilization correlation method.In a single day receiver obtains this mapping, wishes to follow the tracks of reliably immediately the variation of mapping.For this reason, can in first sane VSB Reed/solomon encoder piece of this frame, duplicate the definition of this sane VSB mapping, but not comprise pectination compensation position each outer code.In addition, also have data to indicate time and the (ii) definition of in the future new mapping that (i) this mapping changes in the future.Therefore, the first sane VSB packet of outer encoder frames has the structure of Figure 17, and the sane VSB mapping definition data that provide are as follows: specify current mapping (only with wherein 6) for 8; Specify mapping to change frame number (1-125 before for 8; If 0, then do not change); Also deposit 8 and specify next mapping (still only with wherein 6).The remainder of the first sane VSB packet is data.Figure 17 is seen in the configuration of the RVSB section in each outer encoder frames.

Like this, receiver can be used the variation of reliably sane VSB data tracking mapping.Even burst error has damaged some frames, receiver also can be with reading to keep its oneself frame countdown from the frame data of receiving frame in advance.If receiver is found before not to be inconsistent by the definition of the relevant outer code that obtains of frame synchronization and the definition of the first sane VSB data segment ectomesoderm sign indicating number at any time, just restart its mapping acquisition process.

Prediction of RVSB enhanced data sheet and equalizer feedback

In the ATSC digital television standard A/53 and ATSC digital television standard A/54 guide for use that are all the advanced television system committee publication, the main application of ATSC 8VSB receiver to adaptive equalization and Phase Tracking has been described.As mentioned above, RVSB is characterised in that and has improved adaptive equalization and Phase Tracking.

The reliable valuation that a kind of improvement postpones the input symbols level feeds back to adaptive equalizer and/or phase tracker is realized, the sequence valuation of self-reinforcing type Viterbi algorithm is basis (see " TheViterbi Algorithan; G.D.Forney; Jr., Proc.IEEE, Vol61; pp; 268-278, March, 1973) since it.This class feedback does not need existence initialization problem " coding again ".

Be entitled as " Slice Predictor for a Signal Receiver " a kind of ATSC 8VSB receiver of disclosing of U.S. Patent No. 5,923,711, used the data slice prediction to provide more reliable feedback to phase tracker or adaptive equalizer.This feedback can become more reliable by the enhanced data sheet prognoses system 300 of Figure 19.The ectonexine decoder 302 of system 300 and 304 operation principle are similar to above-mentioned ectonexine decoder.

The data slice prediction of internal layer decoder 302 outputs is with above-mentioned U.S. Patent No. 5,923,711 described similar fashion work.As mentioned above, internal layer decoder 302 is based on a kind of 4 yuan of graticule mesh layouts of 8 attitudes that comprise precoder.Optimal path tolerance according to current time t, the data slice fallout predictor of internal layer decoder 302 is judged the most probable state of t constantly, right according to next possible state then, select the incoming level (from 8 level select) of next code element in four predictions of moment t+1.As Figure 20 by shown in the layout of internal layer decoder graticule mesh, if constantly the most probable attitude of t is a state 1, then NextState is ε [1 5 26], thus constantly next incoming level of t+1 be-7 ,+1 ,-3 or+5, these level correspond respectively to the position of decoding to 00,10,10,01 and 11.

Outer decoder 304 is found out the optimal path tolerance of current time t equally to each graticule mesh layout.Figure 21 illustrates the part of this graticule mesh layout to the outer decoder of an example, is applicable to all three kinds of outer codes usually.As shown in figure 21, right according to next possible state, it is right that moment t+1 is selected two possible outer decoder input positions.For instance, these two positions are to may being 11 or 01.Booster 306 is predicted to giving in the position that outer decoder 304 is selected, as to the prediction of the enhanced data sheet of moment t+1, prediction booster 306 was from before selecting amplitude level+5 or-3 the four level groups by the data slice fallout predictor selection of internal layer decoder 302.Because the data slice of internal layer decoder 302 is predicted almost nil delay, and outer decoder 304 will wait until that internal layer decoder 302 could be with same code element work after the soft output of deciphering is provided, so being a bit larger tham returning of internal layer decoder 302, the time-delay that Postponement module 308 provides seeks time-delay, the data slice that prediction booster 306 provides is predicted, offers the equalizer of phase tracker 310 as feedback.

The a bit additional time-delay of outer decoder 304 bands is made final hard decision and is selected single most probable input position right moment t+1.For example, if its Vitervi algorithm judges that 11 is that outer decoder 304 most probable input positions are right, outer decoder 304 is just given prediction booster 306 this information, then the latter select in the four level groups+5 and the corresponding positions selected of the data slice fallout predictor of internal layer decoder 302 right.This outer code can be that convolution code or other class are entangled by means of sign indicating number.Receiving the ATSC data in a period of time, prediction booster 306 is under an embargo.

Feedback-enhanced Maximum likelihood sequence evaluator (MLSE) data slice prognoses system 320 is used this Viterbi algorithm, and it is shown in Figure 22 together with other relevant parts of RVSB receiver.The ectonexine decoder 322 of this system 320 and 324 is operated to be similar to above-mentioned outer decoder 302 and 304 mode, but do not use the data slice prediction output of internal layer decoder 302, but enhancement mode MLSE module 326 is configured to by operating 8 attitudes, 2/3 ratio sign indicating number graticule mesh layout (the same graticule mesh layout that internal layer decoder 322 uses, comprise precoder), the signal that receives is carried out this general Vitervi algorithm.

The noise 8 level received signals that enhancement mode MLSE module 326 postpones (i) delayed module 328 (if next input right and wrong RVSB code element) or 324 outputs to judgement (soft or hard) of (ii) outer decoder (if next is input as the RVSB code element) are elected to be its next input, and code element information is done this selection by this code element in its utilization RVSB mapping.

Enhancement mode MLSE module 326 is predicted an output in 8 code elements, and this data slice is predicted that (bit decision) is as feedback supply balance device or phase tracker 330 as its data slice.

Enhancement mode MLSE module 326 is passed through 8 attitude graticule mesh layouts than internal layer decoder 322 according to more accurate path, because when the RVSB code element is arranged, it obtains more reliable input from outer decoder 324.

The output of enhancement mode MLSE module 326 can be judgement of hard data sheet or soft level.And, can be used to stride (seeing ATSC digital television standard A/54 guide for use) from any code element reliability indication change equalizer LMS algorithm of internal layer decoder 322 or outer decoder 324.

The specified portions of data field the one RVSB section can comprise the predictive encoding training sequence of Gong selecting for use, and this sequence is that transmitter and receiver are known in advance.When the training sequence of outer decoder 324 output decodings, the input of enhancement mode MLSE module 326 is switched to the storage form of this decoding training sequence.

Corrections more of the present invention have been discussed above, have been implemented personnel of the present invention in this area and can do other correction.For example, though above common ATSC receiver 12 and sane vsb receiver 14 are shown as independently receiver, can be in two data paths of the separate unit receiver that can decipher two class data (ATSC data and sane VSB data) with these two function combinations.

Therefore, description of the invention is an example only, is intended to teach enforcement best mode of the present invention to those skilled in the art.Can make great change and not deviate from spirit of the present invention details, and not exceed the specialized application that drops on all corrections in the appended sharp claim scope.

Claims

1. a method is characterized in that, this method may further comprise the steps:

Reception comprises a frame of first and second fields, first and second fields have frame sync segment and a plurality of data segment separately, wherein data segment comprises the first and second identical data of general layout, first data and second data are corresponding to different data bit numbers, first field comprises current mapping and count information, second field comprises next mapping and count information, the position of current mapping indication at least the first data in present frame, the position of next mapping indication at least the first data in the future frame, and the number of count information indication frame before next mapping becomes current mapping;

Respond current mapping, handle at least the first data in the present frame.

2. the method for claim 1 is characterized in that, current mapping and count information are included in same section of first field, and next mapping and count information are included in same section of second field.

3. method as claimed in claim 2 is characterized in that, the section that comprises current mapping and count information comprises data segment, and the section that comprises next mapping and count information comprises data segment.

4. the method for claim 1 is characterized in that, and is further comprising the steps of: keep the count value that becomes the time correlation of current mapping with next mapping; With count down from described count value according to frame time.

5. the method for claim 1 is characterized in that, the coding ratio of second data in present frame also indicated in current mapping, and the coding ratio of second data in next frame also indicated in next mapping.

6. the method for claim 1, it is characterized in that, data segment comprises the 3rd data, wherein first, second has identical general layout with the 3rd data, first data, second data and the 3rd data are corresponding to different data bit numbers, current mapping also indicate corresponding to second data in present frame first coding ratio and corresponding to second coding ratio of the 3rd data in present frame, next mapping also indicate corresponding to second data in the future frame first coding ratio and corresponding to second coding ratio of the 3rd data in the future frame.

7. the method for claim 1 is characterized in that, first data comprise the ATSC data, and second data comprise sane VSB data.

8. method as claimed in claim 7 is characterized in that, sane VSB data comprise the sane VSB data of 1/2 rate code.

9. method as claimed in claim 7 is characterized in that, sane VSB data comprise the sane VSB data of 1/4 rate code.

10. the method for claim 1, it is characterized in that, data segment comprises the 3rd data, wherein first, second has identical general layout with the 3rd data, first data, second data and the 3rd data are corresponding to different data bit numbers, second data comprise the first sane VSB data, and the 3rd data comprise the second sane VSB data.

11. method as claimed in claim 10 is characterized in that, the first sane VSB data comprise the sane VSB data of 1/2 rate code, and the second sane VSB data comprise the sane VSB data of 1/4 rate code.