CN101356819B - Digital broadcast transmission system and method thereof - Google Patents

Abstract

A digital broadcast transmission system and a method thereof are provided. The digital broadcast transmission system includes: an RS encoder encoding a dual Transmission Stream (TS) including a normal stream and a plurality of turbo streams multiplexed together; an interleaver that interleaves the encoded dual TS; a turbo processor detecting a turbo stream from the interleaved dual TS and encoding the detected turbo stream; a trellis encoder for performing a pseudo 2(P-2) Vestigial Sideband (VSB) encoding of the dual TS after the turbo processing and then performing a trellis encoding; and a main Multiplexer (MUX) multiplexing the trellis-encoded dual TS by adding a field sync signal and a segment sync signal to the trellis-encoded dual TS.

Description

Digital broadcast transmission system and method thereof

technical field

An aspect of the present invention relates to a digital broadcast transmission system and method thereof. More particularly, an aspect of the present invention relates to a digital broadcast transmission system and method thereof, which achieve improved reception performance by encoding a turbo stream using various methods.

Background technique

Based on the Advanced Television Systems Committee (ATSC) digital vestigial sideband (VSB) technology, the terrestrial digital broadcasting system originating in the United States uses a single carrier and a field synchronous signal in 312-segment units. This system has poor reception performance especially in poor channels such as Doppler fading channels.

Figure 1 is a block diagram of a conventional ATSC VSB broadcast sending device, and Figure 2 shows the frame structure of data used in the system in Figure 1.

More specifically, FIG. 1 shows an EVSB system that generates and transmits a dual Transport Stream (TS) by adding robust data to normal data of an existing ATSC VSB system.

Referring to FIG. 1, transmission of a conventional digital broadcast transmission system is explained below.

Normal stream, placeholder pack and turbo stream are input to TS constructor, and dual TS is constructed in TS constructor.

The dual TS is randomized at randomizer 13 , parity bits are appended to the transmitted stream for error correction at Reed-Solomon (RS) encoder 15 , and packets are reconstructed at packet formatter 17 . In addition, the reconstructed packets are interleaved at the interleaver 19 , and the interleaved data are trellis-encoded at the trellis encoder 21 . The trellis encoder 21 generates compatible parity bits by interacting with the compatible parity generator 23 .

After the data is error-corrected at the trellis encoder 21, the error-corrected data is multiplexed at a multiplexer (MUX) 27, wherein the MUX 27 inserts a field sync signal and a segment sync signal into the data. Then, processing of pilot signal insertion, VSB conversion, and up-conversion to RF channel signal level is performed, and data is transmitted through the channel. The above operations can be controlled by control signals from the controller 25 .

As shown in FIG. 2, the data frame applied to the digital broadcast transmitting apparatus in FIG. 1 has consecutive packets M0 to M51, and is formatted at the packet formatter 17, and then output. As shown in the figure, the turbo stream and the normal stream are set at a ratio of 1:3.

Contents of the invention

technical problem

The problem with VSB systems is performance degradation due to dynamic multipath interference and weak signals. However, despite the fact that the conventional digital broadcast transmission system shown in FIG. 1 and FIG. 2 uses a dual TS including a normal stream added with a turbo stream, the conventional digital broadcast transmission system can hardly pass Send ordinary streams in the middle to improve poor reception performance.

In addition, at relatively high power levels (ie, power level 4 used in the existing 8 power levels), the average power consumption of the stream increases. If many turbo streams are used, the quality of normal streams will be relatively reduced. Therefore, adding turbo streams to normal streams is restricted.

Technical solutions

An aspect of the present invention is to provide a digital broadcast transmission system capable of adding as many turbo streams as required without being limited to a specific ratio by applying P-2VSB encoding to turbo streams.

According to the above aspect of the present invention, a digital broadcast transmission system includes: an RS encoder for encoding a dual transport stream (TS) including a common stream and a plurality of turbo streams multiplexed together; an interleaver for encoding the encoded dual The TS is interleaved; the turbo processor detects the turbo stream from the interleaved double TS, and encodes the detected turbo stream; the trellis encoder performs pseudo-2 (P-2) residual sidebands on the turbo-processed double TS (VSB) encoding, followed by trellis encoding; and a main multiplexer (MUX), which multiplexes the trellis-encoded dual TS by adding a field sync signal and a segment sync signal to the trellis-encoded dual TS use.

According to another aspect of the present invention, a digital broadcast transmission method includes: encoding a dual transport stream (TS) including a common stream and a plurality of turbo streams multiplexed together; interleaving the encoded dual TS; The dual TS detects the turbo stream and encodes the detected turbo stream; performs pseudo 2 (P-2) VSB encoding on the turbo-processed dual TS, and then performs trellis encoding; The signal is added to the trellis-coded dual TS to multiplex the trellis-coded dual TS.

Additional and/or other aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Beneficial effect

As described above, according to aspects of the present invention, a broadcast service can be performed using a dual transport stream including a turbo stream and a normal stream.

Description of drawings

These and/or other aspects and advantages of the present invention will become clear and easier to understand by describing the embodiments below in conjunction with the accompanying drawings, wherein:

Fig. 1 is a block diagram of a traditional ATSC digital broadcast transmission system;

Figure 2 shows the frame structure of data used in the system in Figure 1;

3 is a block diagram of a digital broadcast transmission system according to an exemplary embodiment of the present invention;

Fig. 4 is a block diagram of the TS constructor in Fig. 3;

5 to 7 are diagrams showing packets output from the TS constructor;

Figure 8 is a block diagram of the trellis encoder in Figure 3;

Figure 9 shows the internal structure of the trellis encoder in Figure 3;

Figure 10 shows the first encoder in Figure 9;

11 is a block diagram of a digital broadcast transmission system according to another exemplary embodiment of the present invention;

Figures 12 and 13 show transport streams including SRS data;

Figure 14 is a block diagram of the SRS inserter in Figure 11;

Figure 15 shows the trellis encoder in Figure 11;

Figure 16 shows the first encoder in Figure 15;

17 is a block diagram of a digital broadcast receiving system applied to the present invention;

18 and FIG. 19 are diagrams showing the operation of a Viterbi (viterbi) decoder in FIG. 17;

Figure 20 is a block diagram of the turbo decoder in Figure 17;

FIG. 21 is a flowchart explaining a digital broadcast transmission method according to an exemplary embodiment of the present invention.

Detailed ways

Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

FIG. 3 is a block diagram of a digital broadcasting transmission system according to an exemplary embodiment of the present invention. As shown in FIG. 3 , a digital broadcasting system according to an exemplary embodiment of the present invention includes a TS constructor 110, a randomizer 120, an RS encoder 130, a parity formatter 140, an interleaver 150, a turbo processor 160, Trellis encoder 170, compatible parity generator 180, controller 190, master multiplexer (MUX) 200, pilot inserter 310, vestigial sideband (VSB) modulator 320, and radio frequency (RF) converter 330.

The TS constructor 110 receives inputs of a common stream and multiple turbo streams, and processes the turbo streams in the received data. Then, the TS constructor 110 multiplexes the normal stream and the turbo stream to construct a dual transport stream (TS). The TS constructor 110 will be explained in more detail with reference to FIGS. 4 , 5 , 6 and 7 .

The randomizer 120 randomizes the dual TS received from the TS constructor 110 . Through the operation of the randomizer 201, the utilization of the channel space is improved.

The RS encoder 130 encodes the dual TS after being randomized by the randomizer 120 . The RS encoder 130 may be implemented as a concatenated encoder that adds parity bits to a transport stream to correct errors generated by a channel during transmission.

The parity formatter 140 determines the position of the parity bits in the RS-encoded dual TS. Therefore, instead of operating only on packets with normal data, the parity formatter 140 determines the locations of packets with turbo data to prevent parity bits from being located at turbo data locations after interleaving.

Referring to an example of a packet as shown in FIG. 6, the parity formatter 140 changes the parity bits into predetermined data. The parity formatter 140 calculates the position of the parity bits by the following mathematical expression:

(mathematical expression):

m=(52×n+k)% 207

Among them, m represents the position of the parity check bit before interleaving, n is the position of the parity check bit after interleaving (n=0, 1, ..., 206), and k is calculated with modulo 52. Results in order (k=0, 1, . . . , 51).

The above mathematical expression is used to calculate the value of m from 187 to 206, but if the parity bits are in the PID, AF header and normal data, the mathematical expression does not take a result. The position of the parity bit is determined by iteratively applying the above mathematical expression while changing the start position one by one.

Taking segment 10 including 128 bytes of turbo data and 54 bytes of normal data as an example, the parity bit overlaps with PID, AF header and normal data by 21 bytes. In this case, the parity bit position is calculated by applying the above mathematical expression to 176 to 206, and the 20-byte parity bit position is determined.

Therefore, the parity formatter 140 first inserts predetermined data into positions of parity bits other than the PID, AF header, and normal data, and then inserts turbo data into the remainder to construct a new packet structure.

The interleaver 150 interleaves the dual TS. Interleaving changes the position of the data in the frame, but not the data itself.

The turbo processor 150 separates a normal stream and a turbo stream from the dual TS interleaved at the interleaver 150 and encodes the separated turbo stream to enhance the turbo stream. The turbo processor 160 will be explained in more detail below with reference to FIGS. 9 and 10 .

The trellis encoder 170 performs pseudo 2-VSB (P-2VSB) encoding on the turbo-processed dual TS, and performs trellis encoding. The trellis encoder 170 will be explained in more detail below with reference to FIGS. 11 and 13 .

The compatible parity generator 180 generates compatible parity bits for compatibility with the receiver device by interacting with the trellis encoder 170 . The compatible parity generator 180 may generate compatible parity bits based on a double TS packet appended with parity at the RS encoder 130 and a double TS encoded at the trellis encoder 170 .

The controller 190 controls the normal stream and the turbo stream in the TS builder 110, the parity formatter 140, the turbo processor 160, and the trellis encoder 170 according to predetermined control signals.

The master MUX 200 appends a field sync signal and a segment sync signal to the dual TS supplied from the trellis encoder 170 to multiplex the streams.

According to one aspect of the present invention, the turbo stream processed by the turbo processor 160, the turbo stream processed by the turbo processor 160 and P2-VSB encoded by the trellis encoder 170, processed by the turbo processor 160 The subsequent turbo stream, the turbo stream after P2-VSB encoding and trellis encoding at the trellis encoder 170, and the normal stream can all be multiplexed.

The pilot inserter 310 appends a pilot signal to a dual TS appended with a field sync signal and a segment sync signal at the main MUX 200. The pilot signal, which is a relatively small DC phase voltage, is applied to the 8-VSB baseband immediately before modulation, so that a relatively small carrier appears in the zero frequency point of the modulated spectrum. The pilot signal synchronizes the signal with the RF PLL circuit of the receiver device regardless of the transmitted signal.

The VSB modulator 320 performs pulse shaping on the transport stream to which the pilot signal is appended at the pilot inserter 310, and loads the transport stream to an intermediate frequency carrier to perform VSB modulation for modulating the amplitude.

The RF converter 330 performs RF conversion on the transport stream modulated by the VSB at the VSB modulator 320, amplifies the transport stream, and transmits the transport stream to a predetermined frequency band through an allocated channel.

FIG. 4 is a block diagram of the TS constructor in FIG. 3 . As shown in FIG. 4, a TS builder 110 applied to a digital broadcast transmission system according to an exemplary embodiment of the present invention includes an input MUX 112, an RS encoder 114, a packet formatter 116, and a TS MUX 118. The input MUX 112 multiplexes a plurality of turbo streams input into the TS constructor 110. One of the plurality of turbo streams is turbo encoded, the other is P2-VSB encoded, and the other is turbo encoded and then P2-VSB encoded. The RS encoder 114 RS-encodes the turbo stream after the input MUX 112 is multiplexed. The packet formatter 116 restructures the packets of the turbo stream that have been RS-encoded by the RS encoder 114 . The TS MUX 118 multiplexes the turbo stream and the normal stream, thereby constructing a dual TS in which packets of the turbo stream are reconstructed in the packet formatter 116.

5 to 7 are diagrams showing exemplary packets output from the TS constructor 110. Referring to FIG.

Generally, a packet applied to digital broadcasting includes a 1-byte sync signal, a 3-byte header, and a 184-byte payload. The header of the packet includes a packet identifier (PID), and data in the payload is classified into a normal flow and/or at least one turbo flow according to the type of data included in the payload.

As shown in FIG. 5, a normal stream (a) is input to the TS constructor 100, and normal data (b) is included in the payload part. In addition, there is an adaptation field for representing normal data mixed with turbo data. The adaptation field includes 2-byte AF header and N-byte turbo data + empty data space. Fig. 6 shows two packets with a turbo stream and a normal stream, respectively, which can be combined with each other at the TS builder in a ratio of 1:3 or 2:2. FIG. 7 shows an exemplary structure of a packet corresponding to one field, which is constructed at the TS constructor 110 in the form shown in FIG. 6 and input to the randomizer 120. Normal stream and turbo stream are combined in a ratio of 3:1.

FIG. 8 is a block diagram of the turbo processor in FIG. 3 . As shown in FIG. 8, the turbo processor 160 applied to the digital broadcast transmission system of the present invention includes a turbo extractor 162, an outer encoder 164, an outer interleaver 514 and a processor MUX 168. The turbo extractor 162 extracts a turbo stream from the dual TS input to the turbo processor 160 . The outer encoder 164 performs convolutional encoding on the turbo stream extracted by the turbo extractor 162 . The outer interleaver 514 interleaves the turbo stream that has been convolutionally encoded by the outer encoder 164 . The processor MUX 168 multiplexes the turbo stream interleaved by the outer interleaver 514 and the normal stream, and outputs the resulting stream.

Figure 9 shows the internal structure of the trellis encoder in Figure 3, and Figure 10 shows the first encoder. As shown in FIG. 9 , the trellis encoder 170 includes a first encoder 172 for P-2VSB encoding and a second encoder 174 for general trellis encoding.

10, as shown in FIG. 10, the first encoder 172 includes a first MUX 172a, a second MUX 172b, a third MUX 172c, a first adder 172d and a control signal generator (not shown). The first MUX 172a selectively outputs one of the first input _X1 and the second input _X2 . The first input _X1 is also input to the second MUX 172b. The first adder 172d adds the output from the first MUX 172a to the input from the predetermined register _D0 , and outputs the resultant value. Register D ₀ may be the first register of the second encoder. The second MUX 172b selectively outputs one of the first input X ₁ and the output of the first adder 172d. The output X ₂ ′ of the second MUX 172 is input to a second encoder 174 . The third MUX 172c selectively outputs the second input X ₂ or the output of the first MUX 172 . The output _X1 ' of the third MUX 172c is input to the second encoder.

A control signal generator (not shown) provides a control signal to select one of a plurality of inputs from the first to third MUX 172a to 172c.

Therefore, the first encoder 172 removes the pre-encoding effect so that the two outputs of the trellis encoding can have the same value with respect to the data for P-2VSB encoding in the plurality of turbo streams input to the TS constructor.

The output from the first encoder 172, such as the one shown in FIG. 10, is used to process the second encoding. Referring to FIG. 9 , the second encoder 174 includes first to third registers D ₀ , D ₁ , D ₂ , a second adder 174 a, and a third adder 174 b.

The first to third registers D ₀ , D ₁ , D ₂ have predetermined bit values.

The second adder 174a adds one _X2 ' of the outputs from the first encoder to the stored value of the first register _D0 , outputs the resulting data, and stores the output _Z2 in the first register _D0 .

The third adder 174b adds another _X1 ' of the output from the first encoder to the stored value of the second register _D1 , outputs the resulting data, and stores the output _Z0 in the first register _D0 .

According to an exemplary embodiment of the present invention, as the data undergoes a turbo encoding process at the turbo processor 160 and a P-2VSB encoding process at the first encoder 172, new data different from conventional packet data is formed. Therefore, incorrect RS decoding may occur at the receiver device. In order to prevent incorrect RS decoding, the compatible parity generator 180 generates compatible parity bits to be inserted into the parity bit positions of the data from the first encoder 172 .

11 is a block diagram of a digital broadcasting transmission system according to another exemplary embodiment of the present invention, and FIGS. 12 to 13 show transport streams including Supplementary Reference Signal (SRS) data.

As shown in FIG. 11 , a digital broadcast transmission system according to another exemplary embodiment of the present invention includes a TS constructor 110, a randomizer 120, an SRS inserter 125, an RS encoder 130, a parity formatter 140, an interleave 150, turbo processor 160, trellis encoder 170, compatible parity generator 180, controller 190, master MUX 200, pilot inserter 310, VSB modulator 320 and RF converter 330.

The digital broadcast transmission system according to this exemplary embodiment of the present invention has the same structure as that shown in FIG. 3 . Therefore, the same components are given the same reference numerals, and only the different parts of this embodiment will now be explained.

From the packet including the adaptation field shown in FIG. 5 , a dual TS including a stuffing region in the adaptation field is input to the randomizer 120.

The SRS inserter 125 inserts a Supplementary Reference Signal (SRS) into a padding region of the dual TS after being randomized by the randomizer 120 . From the stuffing bytes and AF header inserted into the dual TS, the loss of payload due to SRS and mixed rate can be determined. This will be explained in more detail below with reference to the SRS inserter 125 shown in FIG. 14 .

12 and 13 show packets including SRS data inserted by the SRS inserter 125 . As shown in the figure, both the normal stream and the robust stream (robust stream) include S bytes of SRS data.

Since the remaining components have been explained above with reference to FIG. 3 , an explanation of these remaining components will be omitted for brevity.

FIG. 14 is a block diagram of the SRS inserter in FIG. 11 . As shown in FIG. 14, the SRS inserter 125 includes an SRS pattern memory 125a and an SRS MUX 125b. The SRS pattern memory 125a stores the SRS pattern used for insertion in the padding area. The SRS pattern is made compatible with the receiver device in advance, and the SRS pattern can be used for the equalizer of the receiver device. The SRS MUX 125b adds the SRS pattern stored in the SRS pattern memory 125a to the normal stream and the turbo stream to perform multiplexing.

FIG. 15 shows the trellis encoder in FIG. 11 and FIG. 16 shows the first encoder in FIG. 15 . As shown in FIG. 15 , a trellis encoder 170 according to an exemplary embodiment of the present invention includes a first encoder 172 and a second encoder 174 . The second encoder 174 includes first to third registers D ₀ , D ₁ , D ₂ , a second adder 174 a and a third adder 174 b, and its structure is the same as that of the second encoder shown in FIG. 9 . The first encoder 172 in FIG. 16 includes a first MUX 172a to a third MUX 172c and a first adder 172b, and its structure is the same as that of the first encoder 172 shown in FIG. 10 .

The difference between this embodiment and other embodiments of the present invention is the P-2VSB encoding of the first encoder 172 , which is performed before the trellis encoding of the second encoder 174 . The SRS initialization signal is input to the second MUX 172b and the third MUX 172c. The SRS initialization signal initializes the first to third registers D ₀ , D ₁ , and D ₂ of the second encoder 174 , that is, D ₀ =D ₁ =D ₂ =0.

FIG. 17 is a block diagram of a digital broadcast receiving system applied to the present invention, and FIGS. 18 and 19 are diagrams showing a Viterbi decoder used. As shown in Figure 17, the digital broadcast receiving system includes a demodulator 120, an equalizer 420, a Viterbi decoder 430, a receiver MUX 440, a first deinterleaver 450, an RS decoder 460, a first derandomizer 470 , a first demultiplexer 480 , a turbo decoder 510 , a second deinterleaver 150 , a parity eraser 530 , a second derandomizer 540 and a second demultiplexer 550 .

The demodulator 410 receives a dual TS transmitted from the digital broadcast transmission system shown in FIG. 3 or FIG. 11, detects synchronization from a synchronization signal added to a baseband signal, and performs demodulation.

The equalizer 420 equalizes the dual TSs demodulated by the demodulator 410 . Accordingly, the equalizer 420 compensates for channel distortion due to multipath of the channel, thereby removing interference from the received symbols.

The Viterbi decoder 430 performs error correction on the normal stream of the dual TS, decodes the error-corrected symbols, and outputs symbol packets. The Viterbi decoder 430 decodes normal data using the schematic diagram shown in FIG. 18 and decodes P-2VSB encoded data using the schematic diagram shown in FIG. 19 .

The receiver MUX 440 multiplexes the normal stream after error correction at the Viterbi decoder 430 and the turbo stream after being decoded at the turbo decoder 510 .

The first deinterleaver 450 deinterleaves the normal stream Viterbi-decoded at the Viterbi decoder 430 .

The RS decoder 460 RS-decodes the normal stream deinterleaved by the first deinterleaver 450 .

The first de-randomizer 470 de-randomizes the normal stream decoded by the RS at the RS decoder 460, and outputs the resulting stream.

The turbo decoder 510 decodes the turbo stream of the dual TS equalized by the equalizer 420 . The turbo decoder 510 will be described in more detail below with reference to FIG. 20 .

The second deinterleaver 150 deinterleaves the turbo stream decoded at the turbo decoder 510 .

The parity eraser 530 removes parity bits appended to the turbo stream deinterleaved by the second deinterleaver 150 .

The second derandomizer 540 derandomizes the turbo stream from which parity has been removed in the parity eraser 530 .

The second demultiplexer 550 demultiplexes the turbo stream after being derandomized by the second derandomizer.

Fig. 20 is a block diagram of the turbo decoder in Fig. 17 . As shown in FIG. 20 , turbo decoder 510 includes TCM mapping decoder 511 , outer deinterleaver 512 , outer mapping decoder 513 , outer interleaver 514 , frame formatter 515 and symbol deinterleaver 516 . The TCM map decoder 511 trellis decodes the turbo stream. The outer deinterleaver 512 deinterleaves the turbo stream trellis-decoded at the TCM map decoder 511 . The outer map decoder 513 performs convolutional decoding on the turbo stream deinterleaved by the outer deinterleaver 512 . The outer interleaver 514 interleaves the turbo stream that has been convolutionally decoded by the outer map decoder 513 .

The frame formatter 515 adds the decoded data of the outer mapping decoder 513 to the position of the frame having mixed normal stream and turbo stream corresponding to the position of the turbo stream.

When information exchange is completed between the outer deinterleaver 512 and the outer interleaver 514 of the TCM map decoder 511 and the outer map decoder 513, the decoded data of the TCM map decoder 511 is output for reception of a normal stream, while The decoded data of the outer map decoder 513 is supplied to the frame formatter 515 .

FIG. 21 is a flowchart explaining a digital broadcast transmission method according to an exemplary embodiment of the present invention.

Hereinafter, a digital broadcast receiving method according to an exemplary embodiment of the present invention will be explained with reference to FIGS. 3 to 21 .

The TS constructor 110 receives inputs of a normal stream and a plurality of turbo streams, and performs RS encoding and packet formatting on the turbo streams. Then, the TS constructor 110 multiplexes the processed turbo stream and normal stream to construct a dual transport stream (TS) (op600).

The double TS constructed in the TS constructor 110 is randomized in the randomizer 120 (op610), RS-encoded in the RS encoder 130 (op620), and the position of the parity is determined in the parity formatter 140 and is Formatted (op630), interleaved in the interleaver 150 (op640).

The interleaved dual TS is separated into a normal stream and a turbo stream at the turbo processor 160, and the turbo stream is turbo encoded (op650).

After turbo encoding, the trellis encoder 170 performs P-2VSB encoding using the first encoder 172 and trellis encoding using the second encoder 174 . At this time, through the interaction of the trellis encoder 170 and the compatible parity generator 180, the compatible parity (op660 to op670) can be generated.

Therefore, a turbo stream after turbo processing is formed, a turbo stream encoded by P-2VSB at trellis encoder 170 after turbo processing is formed, and a turbo stream encoded by P-2VSB at trellis encoder 170 after turbo processing is formed and trellis-encoded turbo streams, these three types of turbo streams are multiplexed with common streams in the main MUX200, and constructed as a new dual TS (op690).

After the dual TS constructed by the main MUX 200 undergoes the processing of inserting a pilot signal by the pilot inserter 310 and the processing of VSB modulation by the VSB modulator 320 and RF conversion by the RF converter 330, the dual TS is transmitted through a predetermined channel (op692).

As described above, the dual TS transmitted from the digital broadcast transmission system is received at the digital broadcast reception system, and undergoes processes such as modulation, equalization, Viterbi decoding, deinterleaving, RS decoding, derandomization, and demultiplexing, thereby being Revert to normal TS package, P-2VSB TS package and turbo TS package.

As described above, the digital broadcast distribution system and its method receive a normal stream and a plurality of turbo streams, apply various encoding methods, and thus can add turbo streams without being limited to a specific mixing ratio. In addition, data reception in poor channel environments is also improved.

While certain embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents. Various changes.

Industrial availability

The present invention relates to a digital broadcast sending system and its method.

Claims (20)

1. A digital broadcast transmission system, comprising: RS coder, encodes the dual transport stream TS including common stream and multiple turbo streams multiplexed together; an interleaver, interleaving the encoded dual TS; A turbo processor detects a turbo stream from the interleaved double TS, and encodes the detected turbo stream; a trellis encoder, performing pseudo-2 (P-2) residual sideband VSB encoding on the turbo-processed dual TS, and then performing trellis encoding; and The main multiplexer MUX multiplexes the trellis-coded dual TS by adding a field sync signal and a segment sync signal to the trellis-coded dual TS. 2. The digital broadcast sending system according to claim 1, further comprising: a TS builder, receiving the normal stream and multiple turbo streams, processing the multiple turbo streams, and constructing a TS that includes the normal stream and the multiple turbo streams Dual TS for turbo streaming. 3. The digital broadcast transmission system according to claim 2, wherein the TS constructor comprises: input MUX to multiplex the multiple turbo streams; RS encoder, performing RS encoding on the multiplexed turbo stream; A packet formatter that reconstructs packets of RS-encoded turbo streams; and TS MUX, multiplexes the packets of the reconstructed RS-encoded turbo stream and the normal stream. 4. The digital broadcast transmission system according to claim 1, wherein the trellis encoder comprises: a first encoder for performing pseudo 2VSB encoding on the turbo stream; a second encoder for encoding the double TS encoded by the first encoder Do grid coding. 5. The digital broadcast transmission system according to claim 4, wherein the first encoder comprises: a first MUX selectively outputs one of the first input and the second input; a first adder, adding the output of the first MUX to the input from the register, and outputting the resulting data; a second MUX selectively outputs one of the first input and the output of the first adder; and The third MUX selectively outputs one of the second input and the output of the first MUX. 6. The digital broadcasting transmission system according to claim 5, further comprising: a control signal generator generating a control signal to control outputs from the first to third MUXs. 7. The digital broadcast transmission system according to claim 4, wherein the second encoder comprises: The first to third registers store predetermined data; a second adder that adds one of the outputs from the first encoder to stored data in the first register, outputs the resulting data, and stores the outputted data in the first register; and The third adder adds the other one of the outputs from the first encoder to the stored data of the second register, outputs the resultant data, and stores the outputted data in the third register. 8. The digital broadcast transmission system of claim 7, wherein the stored data of the first register is input to the first encoder through the second adder. 9. The digital broadcast transmission system of claim 1, further comprising a Supplementary Reference Signal (SRS) inserter inserting the Supplementary Reference Signal into the dual TS to be input to the RS encoder. 10. The digital broadcast transmission system according to claim 1, further comprising: a parity formatter for determining a position of the parity bits in the dual TS. 11. The digital broadcast transmission system according to claim 1, further comprising: a compatible parity generator for generating compatible parity bits by interacting with the trellis encoder, the compatible parity bits for compatibility with receiver devices. 12. A digital broadcast transmission method, comprising: Coding of a dual transport stream TS comprising normal streams and multiple turbo streams multiplexed together; Interleave the encoded dual TS; Detect a turbo stream from the interleaved double TS, and encode the detected turbo stream; Pseudo-2 (P-2) residual sideband VSB encoding is performed on the turbo-processed dual TS, followed by trellis encoding; and The trellis-coded dual TS is multiplexed by adding a field sync signal and a segment sync signal to the trellis-coded dual TS. 13. The digital broadcast sending method according to claim 12, further comprising: Receive normal stream and multiple turbo streams; processing the plurality of turbo streams; and A dual TS having a normal stream and the plurality of turbo streams is constructed. 14. The digital broadcast sending method according to claim 13, wherein the step of constructing a dual TS comprises: Multiplexing the multiple turbo streams; Perform RS encoding on the multiplexed turbo stream; reconstructing packets of RS-encoded turbo streams; and The packets of the reconstructed RS-encoded turbo stream and the normal stream are multiplexed. 15. The digital broadcast transmission method according to claim 12, comprising: inserting the supplementary reference signal into a dual TS to be encoded including a normal stream and a plurality of turbo streams multiplexed together. 16. The digital broadcast transmission method according to claim 12, further comprising: after encoding a dual transport stream TS including a common stream multiplexed together and a plurality of turbo streams, determining the number of parity bits in the dual TS Location. 17. The digital broadcast transmission method according to claim 12, further comprising: after the trellis coding, generating compatible parity bits by interacting with the trellis coding, the compatible parity bits being used for Compatible with receiver devices. 18. A digital broadcast receiving system, comprising: The demodulator receives a dual transport stream TS including a normal stream and a turbo stream transmitted from a digital broadcast transmission system, detects synchronization based on a synchronization signal of a baseband signal added to the TS, and demodulates the TS; The equalizer equalizes the demodulated dual TS by compensating for channel distortion caused by channel multipath; The turbo decoder decodes the equalized turbo stream of the double TS; The Viterbi decoder corrects the common stream of the dual TS, decodes the corrected symbols, and outputs symbol packets; The receiver multiplexer MUX multiplexes the normal stream after error correction and the turbo stream after decoding; A de-interleaver that de-interleaves the Viterbi-decoded normal stream and the decoded turbo stream, and then the de-interleaved normal stream and turbo stream are decoded by RS, de-randomized, and output; The parity eraser removes the parity bits attached to the deinterleaved turbo stream; The second de-randomizer de-randomizes the turbo stream from which parity bits have been removed; and The second demultiplexer demultiplexes the turbo stream. 19. The system of claim 18, wherein the turbo decoder comprises: The map decoder performs trellis decoding on the turbo stream, the map decoder has an outer deinterleaver, an outer map decoder and an outer interleaver, the outer deinterleaver deinterleaves the trellis-decoded turbo stream, and the outer map decoder performing convolutional decoding on the deinterleaved turbo stream and generating decoded data according to the convolutional decoding result, the outer interleaver interleaves the convolutionally decoded turbo stream; and A frame formatter that adds decoded data to the position of the TS corresponding to the position of the turbo stream. 20. The system according to claim 19, wherein when information exchange is completed between the outer deinterleaver and the outer interleaver of the mapping decoder and the outer mapping decoder, the decoded data of the mapping decoder is output for Ordinary stream reception.

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