CN1954605B - Digital broadcast transmitting/receiving apparatus and signal processing method thereof - Google Patents

Abstract

A digital broadcasting transmission/reception system having improved reception performance and a signal processing method thereof are disclosed. The digital broadcasting transmitter includes: a TS stream generator for inputting robust packets having stuff bytes at predetermined positions and normal packets (normal packets), and generating a dual-coded TS stream by inserting the robust packets between the normal packets; a randomizer for randomizing the dual TS stream; a stuff byte replacer for replacing stuff bytes of the randomized data from the randomizer with predetermined known data; and an encoder for encoding the data stream into which the known data is inserted. Accordingly, the present invention detects known data from a signal received at a receiving side and uses the detected known data for synchronization and equalization, so that digital broadcasting reception performance in a poor multipath channel can be improved.

Description

Digital broadcast transmitting/receiving device and signal processing method thereof

technical field

The present invention relates to a digital broadcasting transmitter and receiver, more specifically, to a method for replacing stuffing bytes inserted into a data stream with predetermined known data in a dual stream (dual stream), A digital broadcast transmitter and a signal processing method thereof for improving receiving performance, and a corresponding digital broadcast receiver and a method thereof.

Background technique

Advanced Television Systems Committee Vestigial Sideband (ATSC VSB), that is, the U.S. terrestrial digital broadcasting system is a single-carrier scheme and uses field synchronization signals in units of 312 segments. Therefore, the reception performance in poor channels, especially in Doppler fading channels is not ideal.

FIG. 1 is a block diagram showing a conventional ATSC VSB transmitter. According to the ATSC digital television standard (A/53B) for the Enhanced Vestigial Sideband (EVBS) system, the digital broadcast transmitter of Figure 1 adds robust data to the normal data of the existing ATSC VSB system Form a dual stream and send it.

As shown in Figure 1, the robust data in the digital broadcast transmitter is processed by a robust data processor (11), which has a Reed-Solomon (RS) encoder (11-1), data Interleaver (11-2) and Packet Formatter (11-3). The packet formatter (11-3) has a packet identifier (PID) inserter (not shown) and a 1/2 or 1/4 rate duplicator (not shown). A multiplexer (MUX) (12) multiplexes the robust data processed by the robust data processor (11) with normal data.

The data output from the multiplexer (12) in concatenated code form is randomized by a randomizer (13) and passed through an RS encoder (14) and an interleaver (15) to correct errors generated by the channel . In addition, a symbol processor (16) performs enhanced encoding on robust data, a deinterleaver (17) deinterleaves the RS parity before it is reconstructed, and an RS parity removal part (18) removes the RS parity to Compatible with existing systems. Data with RS parity removed is input to the VSB transmitter (19). According to the structure of general VSB sender, described VSB sender (19) comprises: RS coder (19-1), data interleaver (19-2), trellis coder (19-3) and multiplexing device (19-4), and the VSB transmitter (19) performs RS encoding, data interleaving, 12 trellis interleaving encoding, insertion of synchronization signals and pilots, VSB modulation, and up-conversion.

The above-mentioned conventional broadcast transmitter transmits normal data and robust data in one channel according to a dual-stream scheme. Robust data is preprocessed by a robust data processor, specifically, an RS encoder (11-1), an interleaver (11-2) and a The packet formatter (11-3) of the above performs the preprocessing, thereby generating a Moving Picture Experts Group-2 (MPEG-2) transport stream.

The multiplexer (MUX) (12) multiplexes the robust data preprocessed by the robust data processor (11) with the normal data, and the preprocessed robust data is randomized by the randomness generator (13) , the randomized data is externally encoded by the RS encoder of the external encoder, and the externally encoded data is dispersed by the interleaver (15). Furthermore, said robust data is enhanced coded by a symbol processor (16) and passed through a deinterleaver (17) and a parity removal unit (18), said robust data is passed through a deinterleaver (17) to perform symbol to Byte conversion and interleaving of data compatible with existing systems.

Subsequently, RS encoding, data interleaving, 12-trellis interleaving encoding, insertion of synchronization signals and pilots, VSB modulation, etc. are performed as in the existing VSB transmitter.

Fig. 2 shows the data format of the data output by the multiplexer (12). In FIG. 2 , normal data and robust data are arranged at certain intervals so that normal signals and robust signals after trellis encoding are distributed at regular intervals.

The U.S. terrestrial digital television system of FIG. 1 transmits in dual streams by adding robust data to normal data in the existing ATSC VSB system, so that existing normal data and robust data are transmitted together.

However, the U.S. terrestrial digital television system of FIG. 1 has a problem that although dual streams carry robust data, there is little improvement in low transmission performance in multipath channels where existing normal streams are transmitted.

Contents of Invention

Therefore, an aspect of the present invention is to provide a digital broadcasting transmitter for improving transmission performance by replacing stuffing bytes inserted into a dual-code stream with known data and transmitting the same, as well as a corresponding digital broadcasting transmitter and signal processing method thereof. Broadcast receiver and its signal processing method.

In order to obtain an aspect of the present invention, a digital broadcasting transmitter includes: a robust data preprocessor for processing robust data to generate a robust data packet in a predetermined format; a TS stream generator for receiving The normal data packet of the padding byte at the position, and insert the strong data packet into the normal data packet at a specific interval to generate a double TS stream of a specific format; the randomness generator is used to randomize the TS stream output from the TS stream generator ; The stuffing byte replacement part is used to replace the stuffing byte of the data output from the randomness generator with predetermined known data; the first RS encoder is used to perform RS on the data output from the stuffing byte replacement part Encoding; interleaver, for interleaving data output from the first RS encoder; symbol processor, for performing encoding on robust data in the data output from the interleaver; deinterleaver, for processing from the symbol deinterleaving the data output from the deinterleaver; and a trellis encoder for initializing a memory at a start point of known data in the data output from the deinterleaver and performing trellis encoding.

Preferably, said known data has a predetermined specific form.

In addition, the digital broadcasting transmitter further includes: a parity deleting part for deleting the RS parity of the data output from the deinterleaver.

In addition, the digital broadcasting transmitter further includes: a third RS encoder for performing RS encoding on the data output from the parity deletion part; and a re-interleaver for performing RS encoding on the data output from the third RS encoder to interweave.

Preferably, the digital broadcasting transmitter further includes: an RS output buffer for receiving known data from a start point of data output by the parity deleting part and temporarily storing the known data.

In addition, the RS output buffer receives and stores known data that changes according to initialization from the trellis encoder's memory.

In addition, the digital broadcast transmitter further includes: a parity reconstruction part for receiving changed known data from an RS output buffer, performing RS encoding to generate changed parity, and outputting the changed parity to the trellis encoder, and replace the parity added by the third RS encoder.

Furthermore, the stuffing bytes are inserted into the adaptation field of the normal data packet.

Also, the normal data packet includes information on the length of the inserted stuffing bytes inserted at the specific position.

The normal data packet includes information on the length of the inserted stuffing bytes inserted at a specific position.

At the same time, a signal processing method of a digital broadcast transmitter according to the present invention includes: a strong data preprocessing step, processing the strong data to generate a strong data packet in a specific format; section of the normal data packet and insert the strong data packet into the normal data packet at a specific interval to generate a TS stream of a predetermined format; the randomization step randomizes the TS stream generated in the TS stream generation step; the padding byte replacement step, Replace the filling bytes in the data output from the randomization step with predetermined known data; the first RS encoding step performs RS encoding on the data output from the filling byte replacement step; the interleaving step performs RS encoding from the first RS encoding the step of interleaving the data output by the step of interleaving; the step of symbol processing, encoding the robust data of the data output from the interleaving step; the step of deinterleaving, the step of deinterleaving the data output from the step of symbol processing; and the step of trellis encoding, in the step of deinterleaving The starting point of the known data in the output data initializes the memory, and performs trellis encoding.

In addition, a digital broadcasting transmitter according to another embodiment includes: a TS stream generator for respectively receiving a normal data packet and a robust data packet having stuffing bytes inserted at specific positions, and inserting the robust data at specific intervals The packet is inserted into the normal data packet to generate a double TS stream of a specific format; the random generator is used to randomize the TS stream output from the TS stream generator; the stuffing byte replacement part is used to convert the output from the random generator The stuffing bytes of the data are replaced with predetermined known data; the first RS encoder is used to perform RS encoding on the data output from the stuffing byte replacement part; the interleaver is used to perform RS encoding on the data output from the first RS encoder performing interleaving; a symbol processor for performing encoding on robust data in data output from the interleaver; a deinterleaver for deinterleaving data output from the symbol processor; and a trellis encoder for Initialization is performed on a memory of known data among the data output from the deinterleaver from the start point, and trellis encoding is performed.

Preferably, the stuffing bytes are inserted into the adaptation field of the normal data packet and the robust data packet.

Also, the normal data packet and the robust data packet include information on the length of stuffing bytes inserted into a specific position.

In addition, a signal processing method of a digital broadcast transmitter includes: a TS stream generating step of receiving normal data packets and robust data packets in which stuffing bytes are inserted at specific positions, respectively, and inserting the robust data packets into normal data packets at specific intervals. data packet to generate a TS stream of a predetermined format; a randomization step, randomizes the TS stream generated in the TS stream generation step; a padding byte replacement step, replaces the padding byte in the data output from the randomization step with a predetermined known data; the first RS encoding step, performing RS encoding on the data output from the stuffing byte replacement step; the interleaving step, interleaving the data output from the first RS encoding step; the symbol processing step, on the data output from the interleaving step encoding the robust data of ; a first deinterleaving step, deinterleaving the data output from the symbol processing step; and a trellis encoding step, initializing a memory at a starting point of known data in the data output from the first deinterleaving step , and perform grid encoding.

Meanwhile, a digital broadcast receiver according to the present invention includes: a demodulator for receiving and demodulating a signal transmitted from a digital broadcast transmitter in which a stuff byte is inserted at a specific position Double stream, and the signal sent is inserted into the predetermined known data at the position of the stuffing byte; the known data output part is used to detect the position of the known data of the demodulated signal and output the known data ; The equalizer is used to equalize the demodulated signal; the Viterbi decoder is used to correct the equalized signal using the detected known data and decode it; the deinterleaver is used to decode from the Viterbi The data output by the deinterleaver is deinterleaved; the inverse randomizer is used to inversely randomize the data output from the deinterleaver; the demultiplexer is used to separate the data output from the inverse randomizer into robust data and normal data; and a robust data processor for processing and reconstructing the robust data.

Preferably, said known data output means includes: a known symbol detector for detecting information about a position where said known data of said transmitted signal is inserted; a segment marker generator for generating a or a plurality of data frames indicating segments of said specific position with a predetermined identifier; a trellis interleaver for encoding said data frames according to encoding in a digital broadcast transmitter; and a known data extractor for inserting the known data at the position indicated by the identification flag in the interleaved data frame, and outputting it.

Also, the known data output section outputs the detected known data to a demodulator, and the demodulator performs demodulation using the known data.

In addition, a signal processing method of a digital broadcast receiver according to the present invention includes a demodulation step of receiving and demodulating a signal transmitted from a digital broadcast transmitter in which a filler word is inserted at a specific position section, and the signal sent is inserted into predetermined known data at the position of the stuffing byte; the known data output step detects the position of the known data of the demodulated signal and outputs the known data ; Equalizing step, equalizing the demodulated signal; Decoding step, used to use the detected known data to correct and decode the equalized signal; Deinterleaving step, deinterleaving the data output from the decoding step; an inverse randomization step, which inverse randomizes the data output from the deinterleaving step; a demultiplexing step, which separates the data output from the inverse randomization step into robust data and normal data; and a robust data processing step, which processes and reconstructs The robustness data.

According to the present invention, a digital broadcast transmitter generates stuffing bytes and inserts the stuffing bytes into MPEG-2 TS packets, and the inserted stuffing bytes are replaced with known data and sent to a digital broadcasting receiver, digital broadcasting The receiver detects and uses said known data. Therefore, there are effects of being compatible with existing digital broadcasting systems, reducing hardware complexity, and improving digital broadcasting reception performance in poor multipath channels.

Description of drawings

FIG. 1 is a block diagram showing a transmitter of a conventional American terrestrial data broadcasting (ATSC VSB) system;

FIG. 2 is a diagram illustrating a data format of ATSC VSB data;

FIG. 3 is a diagram showing a frame structure of a TS packet;

4 is a diagram illustrating a frame structure of a TS packet including stuffing bytes according to the present invention;

5 is a block diagram illustrating a digital broadcast transmitter according to the present invention;

6 and 7 are diagrams illustrating formats of data output from the randomizer of FIG. 5;

8 and 9 are diagrams illustrating formats of data output from the interleaver of FIG. 5;

10 and 11 are diagrams showing the format of data output from the trellis encoder of FIG. 5;

12 and FIG. 13 are diagrams illustrating formats of data for reconstructing parity according to grid initialization of FIG. 5;

14 is a block diagram of a digital broadcast transmitter according to the present invention; and

FIG. 15 is a diagram provided to describe a known data output part of FIG. 10 .

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 5 is a block diagram illustrating a digital broadcasting transmitter according to the present invention. The digital broadcasting transmitter of FIG. 5 has a structure improving the EVSB system proposed by LG (Zenith)/ATI. Specifically, stuffing bytes are added to MPEG-2 packets of normal data, the stuffing bytes added in a digital broadcast transmitter are replaced with known data, and then transmitted. Said known data are then detected in a corresponding digital broadcast receiver and used to compensate for distortions produced by the channel.

In FIG. 5, the digital broadcast transmitter has: a first multiplexer (110) for multiplexing normal data and robust data output from a robust data preprocessor (100); a randomness generator ( 120), for randomizing the multiplexed data; padding byte replacement part (130), for replacing the padding bytes of the normal data or robust data inserted into the randomized data with a specific sequence; the first One RS coder (140), is used for constructing the data output from stuffing byte replacement part (130) in the form of concatenation code to correct the error that is produced by channel; First interleaver (150), is used for interleaving data; Symbol Processor (160), is used for carrying out enhancement coding to the robust data in the interleaved data; Control signal generator (170); De-interleaver (180), is used for deinterleaving the data that will enhance coding with existing Compatible with the system; and the RS parity deletion part (190), used for deleting the RS parity. The digital broadcast transmitter uses the EVSB system and is created to be compatible with existing systems.

In addition, the digital broadcast transmitter of FIG. 5 has: a third RS encoder (210) for performing VSB transmission channel encoding; a re-interleaver (220) for interleaving data again; and a trellis encoder (230), Used to perform trellis encoding at a 2/3 ratio. The Trellis Encoder (230) performs the process of initializing stuffing bytes.

The robust data preprocessor (100) has: a second RS encoder (101) for performing RS encoding of the robust stream; a second interleaver (103) for interleaving the RS encoded robust stream; a packet formatter (105) for formatting the interleaved robust stream into a specific format.

That is, the robust data preprocessor (100) inserts the PID into the RS encoded robust stream through the packet formatter (105), and makes two copies of it. Then, the robust data preprocessor (100) inserts the formatted robust MPEG packets into normal MPEG packets at specific intervals.

Meanwhile, the normal data packet or the robust data packet input to the first multiplexer (110) according to the present invention includes stuffing bytes. Fig. 3 is a diagram showing the frame structure of a normal TS stream packet. FIG. 4 is a diagram showing a frame structure of an MPEG-2 TS stream packet including an adaptation field with stuffing bytes according to the present invention.

In Fig. 4, the 188-byte MPEG-2 packet includes: 4-byte information signal (MPEG-2 header) including MPEG synchronization signal, 1-byte adaptive field length information, 1-byte other information, n bytes of adaptation field data with stuffing bytes and 188-(4+2+n) bytes of ES data.

As shown in FIG. 3, a normal TS stream packet frame includes an MPEG-2 header and an adaptation field or ES data. As shown in FIG. 4, a normal packet or a robust packet according to the present invention has a structure in which insertion bytes are inserted into an adaptation field so that a TS stream includes the adaptation field. In this way, MPEG-2 TS packets of normal data or robust data are input to the first multiplexer (110).

The first multiplexer (110) multiplexes the above normal data or the robust data output from the robust data preprocessor (100), and the randomizer (120) randomizes the multiplexed data .

A stuffing byte replacement part (130) replaces stuffing bytes inserted into normal data or robust data of randomized data with specific sequences generated by, for example, a specific sequence generator (not shown) and outputs them. The specific sequence is data having a predetermined pattern known to each other by the transmitter and the receiver, hereinafter referred to as known data.

FIG. 6 shows a data format after n bytes of stuffing bytes in a normal data packet output from the randomness generator (120) are replaced with specific sequence data. In FIG. 6, normal data packets and robust data packets are arranged at certain intervals, and known data is inserted into the adaptation field of the normal data packets instead of stuffing bytes.

In addition, FIG. 7 shows when stuffing bytes are respectively inserted into the normal data packet and the robust data packet to be input to the randomness generator (120) when the normal data packet and the robust data packet output from the randomness generator (120) are output. The stuffing bytes of n bytes in the robust data packet are replaced with the data format after the specific sequence data. In FIG. 7, normal data packets and robust data packets are arranged at certain intervals, and known data is inserted into adaptation fields of the normal data packets and the robust data packets instead of stuffing bytes.

In addition, as described above, the header of the MPEG-2 packet data output from the randomizer (120) includes a sync signal of the first byte and a packet identifier (PID) of 3 bytes. The first two bytes of the byte-specific adaptation field include adaptation field length information. In other words, the first two bytes of the adaptation field have information on the length of stuffing bytes inserted into the adaptation field, that is, the length of known data. Since the start position of the known data in the packet is fixed, the receiver can know information about the position and length, that is, the amount of the known data, according to the information inserted into the first two bytes of the adaptation field.

The first RS encoder (140) encodes data output from the stuffing byte replacement part (130), and performs outer encoding in the form of concatenated codes to correct errors generated by the channel.

The first interleaver (150) interleaves the data output from the first RS encoder (140). A symbol processor (160) performs enhanced encoding of robust data in the interleaved data. For compatibility with existing systems, a deinterleaver (180) performs deinterleaving, and an RS parity removal part (190) removes parity in enhanced-coded data.

8 and 9 are diagrams illustrating the format of data after interleaving by the first interleaver (150). As shown in FIGS. 8 and 9, the first interleaver (150) disperses the MPEG-2 packets of FIGS. 6 and 7 in units of 52. As shown in FIG. 8, data having the same byte position in the MPEG-2 pack constitutes the same column after interleaving. In addition, the data format output from the trellis encoder (230) after 12-symbol interleaving is as shown in FIG. 10 and FIG. 11 . That is, as shown in FIGS. 10 and 11, after trellis encoding, data having the same byte position in the MPEG-2 pack constitutes almost one data segment. Therefore, if stuffing bytes are consecutively added to specific positions of an MPEG-2 packet and randomized, and trellis encoding is used to replace said stuffing bytes with a specific sequence, the stuffing words inserted at the same byte positions The stuff bytes are detected and used as known data in digital broadcast receivers to improve reception performance.

A control signal generator (170) detects information on the length of the adaptive field, and generates and outputs a flag signal indicating stuffing bytes or known symbol sequence data.

Also, to perform VSB transport channel coding, the third RS encoder (210) performs RS coding, the re-interleaver (220) interleaves data again, and the trellis coder (230) performs trellis coding of 2/3 rate.

The RS output buffer (240) and the parity reconstruction part (250) reconstruct the parity of the known data changed according to the initialization of the trellis encoder (230).

The RS output buffer (240) outputs known data from the beginning, and temporarily stores the output known data from the data without RS parity output from the RS parity deletion part (190) . Subsequently, when said known data is trellis encoded by trellis encoder (230) according to said initialization, RS output buffer (240) receives from trellis encoder (230) known data changed according to said initialization , replacing previously buffered known data with the changed known data, storing the changed known data, and inputting the changed known data to a parity reconstruction part (250) to regenerate parity.

The parity reconstruction part (250) receives the known data changed according to the initialization, regenerates the parity according to the changed data, and inputs it to the trellis encoder (230) so as to replace the previous parity for the new parity.

The trellis encoder (230) converts the data output from the re-interleaver (220) into symbols, and performs symbol mapping by trellis encoding at a rate of 2/3. Furthermore, as mentioned above, the trellis encoder (230) performs a 12 trellis encoding initialization at the beginning of the known data, i.e. known symbol sequence, so that the value of the memory element of the encoder becomes a special value, such as "00" . The trellis encoder (230) initializes a value temporarily stored in its own memory element at the start position of known data, and performs trellis encoding of the known data.

Thus, the data packets output from the Trellis Encoder (230) to the Multiplexer (260) include known data changed according to the initialization of the memory elements of the Trellis Encoder (230), with added The parity-check data format of the RS-encoded parity of the known data.

10 and 11 show the format of data processed by 12-symbol interleaving output from the trellis encoder (230). One field consists of 6 convolutional interleaves, so that 6 sequences including stuffing bytes appear. In other words, if the TS stream has 10 bytes of stuffing bytes, 10*6=60 known symbol sequences are generated within one field.

Fig. 12 and Fig. 13 show the data format after the parity is reconstructed by RS re-encoding and the parity reconstruction part (250) of Fig. 5 . That is, if the trellis encoder (230) is initialized at the starting point of a known symbol, the parity reconstruction part (250) changes the output parity of the third RS encoder (210) according to the initialized value , and the changed parity is input to the trellis encoder (230). Therefore, the trellis encoder (230) updates the changed parity and performs trellis encoding so that there will be no problem when the RS decoder of the digital broadcasting receiver decodes.

In other words, the initialization of the trellis encoder (230) is performed so that the trellis-encoded data forms a special sequence in the part of the known symbol sequence. Subsequently, in order to change the RS parity corresponding to the known symbol sequence changed according to the initialization, RS encoding of the changed known symbol sequence is performed again to change the parity. The existing parity is replaced by the changed parity, thereby generating the data format as shown in Fig. 12 and Fig. 13 .

The field sync signal and the segment sync signal are encoded and mapped by the second multiplexer (260) through the trellis encoder (230), the RS output buffer (240) and the parity reconstruction part (250) to data in the same format as in Figure 2. A DC offset is added at the transmitter end to generate a pilot so that VSB modulation is performed and the data is converted to RF and transmitted.

FIG. 14 is a block diagram of a digital broadcast receiver corresponding to the digital broadcast transmitter of FIG. 5 according to the present invention. The digital broadcast receiver has elements for decoding if the received signal includes normal, robust and stuff bytes.

The digital broadcast receiver of Figure 14 includes: a demodulator (510) for reducing the RF signal to baseband and demodulating it; an equalizer (520) for removing internal interference between symbols; a Viterbi decoder or trellis decoder (530); deinterleaver (540); RS encoder (550); inverse randomizer (derandomizer) (560); demultiplexer (570), for separating normal data and robust Data; Control signal generator (580), is used for generating the control signal of controlling double stream; Robust data processor (590) and known data output part (600), is used for detecting the position of stuffing byte and output known data.

The Viterbi decoder (530), deinterleaver (540), RS encoder (550) and inverse randomizer (560) correct errors from the equalized signal and perform decoding.

The demodulator (510) converts an RF signal received through a channel into a baseband signal through a tuner/IF (not shown), detects synchronization of the converted baseband signal, and performs demodulation. The equalizer (520) compensates for multipath channel distortion of the demodulated signal.

At the same time, the known data output part (600) detects information about the length of stuffing bytes inserted into the reserved part of the field sync data segment part or the first two bytes of the adaptation field to obtain position information about the known symbols, And output known data from the obtained information about the position.

FIG. 15 shows a known data output part (600) for detecting known data in a digital broadcasting receiver.

The known data output part (600) includes: a known symbol detector (610), a segment flag generator (620), a trellis interleaver (630) and a known data extractor (640).

If information on the amount (number) of stuffing bytes is inserted into the control information bit including information on the length of the adaptation field of the data header, or is inserted into the reserved part of the field sync data segment part, the digital broadcast receiver The known sign detector (610) in the known data output part (600) of the method detects information about the amount of known data. From the detected information, the segment marker generator (620) and trellis interleaver (630) obtain information about the location and number of known symbols. The known data extractor (640) outputs known data from the obtained information on the position and number of known symbols, so that the reception performance of the digital broadcast receiver is improved. Since the position of stuffing bytes is always fixed, if the amount of stuffing bytes is detected, the segment flag generator (620) and trellis interleaver (630) can be implemented using counters and control logic.

That is, the known symbol detector (610) extracts the information of the known data position from the control information bit including the information on the length of the adaptation field of the demodulated data header. The information about known data locations includes information about known data lengths. Since the position of the known data is preset, the position and number of known symbols according to the encoding of the known data can be obtained by knowing the length.

According to the position and number of known symbols, the segment marker generator (620) marks a predetermined marker of length corresponding to the number at the corresponding position, and generates at least one segment and an MPEG-2 transmission frame including the segment.

The trellis interleaver (630) encodes the transmission frame generated at the segment flag generator (620) like interleaving in the digital broadcasting transmitter.

a known data extractor (640) inserts predetermined known data into a transmission frame at the position of the known symbol identified by the flag, and outputs a frame of the inserted known data, the transmission frame is encoded and are output from the trellis interleaver (630).

Meanwhile, errors of the signal equalized by the equalizer (520) are corrected through the Viterbi decoder (530) and the signal is decoded into symbol data. The deinterleaver (540) rearranges the data dispersed by the first interleaver (150) in the transmitter of FIG. 5 . Errors of the deinterleaved data are corrected through the RS encoder (550). A control signal generator (580) generates control signals to process normal data and robust data. The data corrected by RS encoder (550) is inverse randomized by inverse randomizer (560). The inverse randomized data is separated into normal data and robust data by a demultiplexer (570), and the robust data is processed by a robust data processor (590).

As described above, stuffing bytes are generated and inserted into MPEG-2 TS packets, the inserted stuffing bytes are replaced with known data, and transmitted from the digital broadcasting transmitter, and subsequently, the data broadcasting receiver detects and uses the known data. Therefore, the reception performance of the digital broadcast receiver such as synchronization acquisition and equalization performance is improved.

Claims (42)

1. A digital broadcast transmitter, comprising: A robust data preprocessor for processing robust data to generate robust data packets in a predetermined format; A TS stream generator for receiving a normal data packet including stuffing bytes inserted into a specific position, and inserting a robust data packet into the normal data packet at a specific interval to generate a dual TS stream of a specific format; a random generator for randomizing the TS stream output from the TS stream generator; A padding byte replacement part is used to replace the padding bytes of the data output from the randomness generator with predetermined known data; A first RS encoder for performing RS encoding on data output from the stuffing byte replacement part; an interleaver configured to interleave data output from the first RS encoder; a symbol processor for performing encoding on robust data in the data output from the interleaver; a deinterleaver for deinterleaving data output from the symbol processor; and A trellis encoder for initializing a memory at a start point of known data among data output from the deinterleaver, and performing trellis encoding. 2. The digital broadcasting transmitter of claim 1, wherein the known data has a predetermined specific form. 3. The digital broadcast transmitter of claim 1, further comprising: a parity removing section for removing RS parity of data output from the deinterleaver. 4. The digital broadcast transmitter of claim 3, further comprising: a third RS encoder for performing RS encoding on the data output from the parity erasing section; and a re-interleaver for interleaving the data output from the third RS encoder. 5. The digital broadcasting transmitter as claimed in claim 4 , further comprising: an RS output buffer for receiving known data from a start point of data output by the parity deleting part, and temporarily storing the known data . 6. The digital broadcasting transmitter of claim 5, wherein the RS output buffer receives and stores known data changed according to initialization from a memory of the trellis encoder. 7. The digital broadcast transmitter of claim 6, further comprising: a parity reconstruction part for receiving the changed known data from the RS output buffer, performing RS encoding to generate the changed parity, outputting the changed parity to the trellis encoder, and replacing the changed parity by the third Parity added by RS encoder. 8. The digital broadcasting transmitter of claim 1, wherein the stuffing bytes are inserted into an adaptation field of a normal data packet. 9. The digital broadcasting transmitter of claim 1, wherein the normal data packet includes information on a length of the inserted stuffing byte inserted into a specific position. 10. A signal processing method for a digital broadcast transmitter, comprising: Robust data preprocessing step, which processes robust data to generate robust packets in a specific format; The TS flow generation step receives the normal data packet inserted into the stuffing byte at a specific position and inserts the robust data packet into the normal data packet at a specific interval to generate a TS stream of a predetermined format; A randomization step, randomizing the TS stream generated in the TS stream generation step; A padding byte replacement step, replacing the padding bytes in the data output from the randomization step with predetermined known data; A first RS encoding step, performing RS encoding on the data output from the stuffing byte replacement step; an interleaving step, interleaving the data output from the first RS encoding step; a symbol processing step to encode robust data of the data output from the interleaving step; a deinterleaving step for deinterleaving the data output from the symbol processing step; and A trellis encoding step of initializing a memory at a starting point of known data among the data output from the deinterleaving step, and performing trellis encoding. 11. The method of claim 10, wherein said known data has a predetermined specific form. 12. The method of claim 10, further comprising: A parity removing step of removing RS parity of the data output from the deinterleaving step. 13. The method of claim 12, further comprising: a third RS encoding step of performing RS encoding on the data output from the parity deletion step; and In the re-interleaving step, the data output from the third RS encoding step is interleaved. 14. The method of claim 13, further comprising: The RS output buffering step receives and temporarily stores known data of the data output from the parity removal step from the start point. 15. The method of claim 14, wherein the RS output buffering step receives and stores known data changed according to initialization of memory from the trellis encoding step. 16. The method of claim 15, further comprising: The parity reconstruction step receives the changed known data from the output of the RS output buffering step, and performs RS encoding to generate the changed parity, outputs the changed parity to the trellis encoding step, and replaces the Parity added in three RS encoding steps. 17. The method of claim 10, wherein the stuffing bytes are inserted into an adaptation field of a normal data packet. 18. The method of claim 10, wherein the normal data packet includes information on a length of the inserted stuffing byte inserted into a specific position. 19. A digital broadcast transmitter comprising: The TS stream generator is used to respectively receive the normal data packet and the strong data packet respectively inserting padding bytes at specific positions, and insert the strong data packet into the normal data packet at a specific interval to generate a double TS stream of a specific format; a random generator for randomizing the TS stream output from the TS stream generator; A padding byte replacement part is used to replace the padding bytes of the data output from the randomness generator with predetermined known data; A first RS encoder for performing RS encoding on data output from the stuffing byte replacement part; an interleaver configured to interleave data output from the first RS encoder; a symbol processor for performing encoding on robust data in the data output from the interleaver; a deinterleaver for deinterleaving data output from the symbol processor; and A trellis encoder for initializing a memory at a start point of known data among data output from the deinterleaver, and performing trellis encoding. 20. The digital broadcasting transmitter of claim 19, said known data having a predetermined specific form. 21. The digital broadcast transmitter of claim 19, further comprising: a parity removing section for removing RS parity of data output from the deinterleaver. 22. The digital broadcast transmitter of claim 21 , further comprising: a third RS encoder for performing RS encoding on the data output from the parity erasing section; and a re-interleaver for interleaving the data output from the third RS encoder. 23. The digital broadcast transmitter of claim 22, further comprising: an RS output buffer for receiving known data from a data start point output by the parity deleting part, and temporarily storing the known data. 24. The digital broadcasting transmitter of claim 23, wherein the RS output buffer receives and stores known data changed according to memory initialization from the trellis encoder. 25. The digital broadcast transmitter of claim 24, further comprising: a parity reconstruction part for receiving changed known data from the RS output buffer, performing RS encoding to generate changed parity, outputting the changed parity to the trellis encoder, and replacing Parity added by RS encoder. 26. The digital broadcasting transmitter of claim 19, wherein the stuffing bytes are inserted into adaptation fields of the normal data packet and the robust data packet. 27. The digital broadcasting transmitter of claim 19, wherein the normal data packet and the robust data packet include information on a length of a stuff byte inserted into a specific position. 28. A signal processing method of a digital broadcast transmitter, comprising: The TS flow generation step is to respectively receive a normal data packet and a strong data packet respectively inserting padding bytes at a specific position and insert the strong data packet into the normal data packet at a specific interval to generate a TS stream of a predetermined format; A randomization step, randomizing the TS stream generated in the TS stream generation step; A padding byte replacement step, replacing the padding bytes in the data output from the randomization step with predetermined known data; A first RS encoding step, performing RS encoding on the data output from the stuffing byte replacement step; an interleaving step, interleaving the data output from the first RS encoding step; a symbol processing step to encode robust data of the data output from the interleaving step; a deinterleaving step for deinterleaving the data output from the symbol processing step; and A trellis encoding step of initializing a memory at a start point of known data among the data output from the deinterleaving step, and performing trellis encoding. 29. The method of claim 28, wherein said known data has a predetermined specific form. 30. The method of claim 28, further comprising: a parity deletion step of deleting the RS parity of the data output from the deinterleaving step. 31. The method of claim 30, further comprising: a third RS encoding step of performing RS encoding on the data output from the parity deletion step; and In the re-interleaving step, the data output from the third RS encoding step is interleaved. 32. The method of claim 31 , further comprising: The RS output buffering step receives and temporarily stores known data of the data output from the parity removal step from the start point. 33. The method of claim 32, wherein the RS output buffering step receives and stores known data changed according to initialization of the memory from the trellis encoding step. 34. The method of claim 33, further comprising: A parity reconstruction step that receives the changed known data output from the RS output buffering step, performs RS encoding to generate changed parity, outputs the changed parity to the trellis encoding step, and replaces Parity added by the RS encoding step. 35. The method of claim 28, wherein the stuffing bytes are inserted into the adaptation field of the normal data packet and the robust data packet. 36. The method of claim 28, wherein the normal data packet and the robust data packet include information on a length of a stuffing byte inserted into a specific position. 37. A digital broadcast receiver comprising: a demodulator for receiving and demodulating signals from a digital broadcast transmitter; known data output means for detecting a specific position of known data of the demodulated signal and outputting said known data; an equalizer for equalizing the demodulated signal; a Viterbi decoder for error-correcting and decoding the equalized signal using the detected known data; a deinterleaver for deinterleaving data output from the Viterbi decoder; an inverse randomizer for inverse randomizing the data output from the deinterleaver; a demultiplexer for separating the data output from the inverse randomizer into robust and normal data; and a robust data processor for processing and reconstructing said robust data, The signal is a dual-code stream transmitted from a digital broadcasting transmitter that initializes an internal memory at a start point of known data and performs trellis encoding on the signal. 38. The digital broadcast receiver of claim 37, wherein said known data output means comprises: a known symbol detector for detecting information about a particular location where said known data of said signal is inserted; a segment marker generator, configured to generate a data frame including one or more segments indicating the specific position with a predetermined identification marker; a trellis interleaver for encoding said frame of data according to encoding in a digital broadcast transmitter; and The known data extractor is configured to insert the known data at the specific position indicated by the identification mark in the coded data frame, and output the coded data frame. 39. The digital broadcast receiver as claimed in claim 38, wherein said known data output part outputs said detected known data to a demodulator, and said demodulator uses said known data Perform demodulation. 40. A signal processing method for a digital broadcast receiver, comprising: A demodulation step of receiving a signal from a digital broadcast transmitter and demodulating the signal; a known data output step of detecting a specific position of known data of the demodulated signal and outputting said known data; an equalizing step, equalizing the demodulated signal; a decoding step for error-correcting and decoding the equalized signal using the detected known data; A deinterleaving step for deinterleaving the data output from the decoding step; an inverse randomization step for inverse randomizing the data output from the deinterleaving step; a demultiplexing step that separates the data output from the derandomization step into robust and normal data; and a robust data processing step, processing and reconstructing said robust data, The signal is a dual-code stream transmitted from a digital broadcasting transmitter that initializes an internal memory at a start point of known data and performs trellis encoding on the signal. 41. The method of claim 40, wherein said known data outputting step comprises: detecting from the received signal information about the specific location where said known data is inserted; generating a data frame comprising one or more segments indicating said specific location with a predetermined identifier; encoding said frame of data according to encoding in a digital broadcast transmitter; and inserting the known data at the specific position indicated by the identification mark in the coded data frame, and outputting the coded data frame. 42. The method according to claim 40, wherein the known data output step outputs the detected known data for the demodulation step, and the demodulation step performs demodulation using the known data .

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