KR100519361B1 - Digital Enhanced 8-VSB receiving system and E8-VSB data demultiplexing method in a E8-VSB receiving system - Google Patents

Abstract

The present invention relates to an E8-VSB receiving system and an E8-VSB data demultiplexing method which can stably receive not only an existing ATSC 8VSB signal but also an enhanced VSB signal. In the E8-VSB transmission system, the enhanced data is encoded at a 1/2 code rate and a 1/4 code rate, respectively, and then the encoded 1/2 and 1/4 enhanced data are multiplexed in packet units according to a predetermined multiplexing rule to MPEG. In the case of converting a transport packet into a format and multiplexing the format-converted enhanced data and main data in units of segments according to a predetermined multiplexing rule, the E8-VSB reception system according to the present invention transmits the E8-VSB. The system extracts the E8-VSB map information inserted and inserted into the field synchronization section to generate information indicating the attributes of each VSB symbol. Then, the channel decoder separates and decodes the normal 8VSB signal and the 1/2 and 1/4 enhanced VSB signals, thereby completely receiving the E8-VSB signal together with the ATSC 8VSB signal.

Description

Digital Enhanced 8-VSB receiving system and E8-VSB data demultiplexing method in a E8-VSB receiving system}

The present invention provides an enhanced 8-VSB receiving system and an E8- that can receive a plurality of enhanced data encoded at different code rates by multiplexing and transmitting the MPEG data encoded by the conventional ATSC 8VSB method. VSB data demultiplexing method.

In the United States, the ATSC (Advanced Television Systems Committee) 8VSB (Vestigial Sideband) transmission method was adopted as a standard in 1995, and broadcasted since the second half of 1998.In Korea, the same ATSC 8VSB transmission method is used as the standard. The experiment was started in May 1995, and the test broadcast system was switched to August 31, 2000. Since October 2001, each broadcasting company has been broadcasting.

1 illustrates such a conventional ATSC 8VSB transmission system.

In FIG. 1, the ATSC data randomizer 101 randomly outputs the input MPEG video / audio data to the Reed Solomon encoder 102, and the Reed Solomon encoder 102 reads the randomized data into Reed Solomon encoding. 20 bytes of parity code is added to the data and output to the data interleaver 103. The data interleaver 103 performs interleaving to change the order of data output from the Reed Solomon encoder 102 and outputs the data to the trellis encoder 104. The trellis encoder 104 outputs the interleaved data. After converting from byte to symbol, it is trellis coded and outputted to the multiplexer 105. The multiplexer 105 multiplexes the trellis coded symbol sequence and the synchronization signals to the pilot inserter 106, and the pilot inserter 106 adds a pilot signal to the multiplexed symbol sequence. Output to the VSB modulator 107. The VSB modulator 107 modulates a symbol string output from the pilot inserter 106 into an 8VSB signal of an intermediate frequency band and outputs the RF string to the RF converter 108. The RF converter 108 converts a signal of an intermediate frequency band modulated into an 8VSB signal into an RF band signal and then transmits the signal through an antenna.

The ATSC 8VSB transmission system developed for high definition HD (High Definition) broadcasting transmits MPEG-2 digital picture quality and Dolby Digital sound. However, as the Internet is widely used these days, the demand for interactive broadcasting is increasing, and various additional services are required. Therefore, a system capable of providing separate additional services in addition to MPEG-2 video and Dolby sound in the same channel has been developed. There is.

In this case, unlike general video / audio data, in case of transmitting additional data (eg, program execution file, stock information, etc.), the error rate should be lower. This is because, in the case of video / audio data, an error that the human eye and ear cannot detect is not a problem, whereas in the case of additional data, a bit error may cause a serious problem.

Therefore, in the new E8-VSB transmission system that is compatible with the existing ATSC 8VSB system, the additional data is encoded at 1/2 code rate and 1/4 code rate, and then multiplexed in packet units according to a predetermined multiplexing rule, thereby transporting MPEG transport packets. The present invention has been previously filed by the present applicant for converting the format-converted enhanced data and the main data into segments in accordance with a predetermined multiplexing rule and transmitting the data in a segment unit (application number: P03-17834, Filed Date: 2003.03.21).

In the above patents, data is divided into main data and enhanced data. Here, the main data refers to the aforementioned MPEG-2 video and Dolby Digital sound data. The enhanced data refers to 1/2 enhanced data encoded at 1/2 code rate and 1/4 enhanced data encoded at 1/4 code rate. In the above-mentioned patent, the 1/2 enhanced data is called 1/2 additional data, and the 1/4 enhanced data is called 1/4 additional data, and the meaning is the same.

For convenience of explanation, a signal in which enhanced VSB data (EVSB) and main VSB data (ATSC 8VSB) are multiplexed and transmitted as described above is referred to as an enhanced 8-VSB (hereinafter, referred to as E8-VSB) signal. Here, the enhanced VSB data is used mixed with the enhanced data, and the main VSB data is used mixed with the main data.

FIG. 2 is a block diagram illustrating a typical ATSC 8VSB receiver. When a VSB modulated high frequency (RF) signal is received through an antenna, the tuner 201 selects only an RF signal of a desired channel by tuning and converts it into an IF signal. Output at 202. The IF mixer 202 down-converts the IF signal output from the tuner 201 to a base band (BB) signal and outputs the demodulator 203 to the demodulator 203. The demodulator 203 is the baseband. The signal is demodulated to VSB and output to the equalizer 204.

The equalizer 204 compensates for the channel distortion included in the VSB demodulated signal and outputs the same to the 8VSB channel decoder 205. The 8VSB channel decoder 205 converts the signal whose channel distortion is compensated into an MPEG transport (TP) form and outputs the converted signal.

However, the general ATSC 8VSB receiver as shown in FIG. 2 uses the PID (Packet Identification) given to the header of the transport packet of the E8-VSB signal when the E8-VSB signal in which the enhanced data and the main data are multiplexed as described above is transmitted. Only existing MPEG transport packets are selected to receive digital broadcasting, and the enhanced data packets are discarded.

An object of the present invention is to provide an E8-VSB receiving system and an E8-VSB data demultiplexing method capable of stably receiving not only an existing ATSC 8VSB signal but also an enhanced VSB signal.

The digital E8-VSB receiving system according to the present invention for achieving the above object, the first enhanced data encoded at a 1/2 code rate and the second encoded at a 1/4 code rate in the E8-VSB transmission system The enhanced data is multiplexed in packet units according to the multiplexing rule of the E8-VSB map information inserted in the unused area of the field sync signal and converted into a format of an MPEG transport packet, and the format-converted enhanced data and main data are converted into the format. E8-VSB modulated RF signal in the E8-VSB receiving system that receives the E8-VSB signal multiplexed in segments according to the multiplexing rule of the E8-VSB map information inserted in the unused area of the field sync signal. When the tuner is received through the antenna, the tuner selects only the RF signal of the desired channel by tuning and converts the IF signal into an output signal. A demodulator for converting an IF signal output from the tuner into a baseband signal and outputting the result in a transport (TP) packet form; Frame recovery is performed from the output of the demodulator to detect the field sync signal and the field discrimination signal in the frame, and the E8-VSB map inserted and transmitted into the unused area of the field sync signal using the detected field sync signal and the field discrimination signal. A map information recovery unit which extracts and decodes the information and generates each VSB symbol attribute information; A channel equalizer which receives respective VSB symbol attribute information of the map information recovery unit and compensates for channel distortion included in the VSB demodulated signal; And decoding general 8VSB data and first and second enhanced VSB data from the signal equalized by the channel equalizer using E8-VSB map information, VSB symbol attribute information, and field synchronization signal of the map information recovery unit, respectively. And an E8-VSB channel decoder / demultiplexer.

The E8-VSB map information is Kerdock coded and inserted into an unused area of the field sync signal, and the number of packets of the first and second enhanced data transmitted in one field is determined, and the determined first and the first And multiplexing rule information of enhanced data and multiplexing rule information of enhanced data and main data.

The map information recovery unit performs a frame recovery from the data symbols output from the demodulation unit and detects a field synchronization signal indicating a field synchronization signal and a field division signal indicating whether an even field or an odd field is generated, and using the field synchronization signal. A map information extraction unit for extracting the E8-VSB map information inserted and transmitted into the field synchronization signal from the data symbol output from the demodulator, a Kerdock decoder for decoding the extracted E8-VSB map information with a Kerdock decoding algorithm, and A current map determination unit for determining E8-VSB map information of a current field from the Kerdock-decoded E8-VSB map information by a field synchronization signal and a field division signal, and an E8-VSB map information and a field synchronization signal of the current field; Generating symbol attribute information for generating VSB symbol attribute information indicating the attribute of each symbol of the E8-VSB signal And it characterized in that the configuration comprises a.

The symbol attribute information generation unit receives the E8-VSB map information of the current field output from the current map determination unit and the field synchronization signal output from the frame recovery unit and includes only attribute information of the E8-VSB symbol in 188 byte units. A mux packet processing unit for generating and outputting a packet, an ATSC RS encoder for adding 20 bytes having a property of a general 8VSB symbol to the 188 byte control packet, and outputting a control packet of 208 bytes; An ATSC data interleaver for interleaving data bytes and outputting the data in byte units, and a byte-symbol converter for converting the interleaved byte data into symbol data and outputting VSB symbol attribute information.

The MUX packet processing unit has an attribute of whether it is the first enhanced data or the second enhanced data according to the distribution type and the ratio of the first and second enhanced data packets of the current field in the E8-VSB map information of the current field. An enhanced packet generation unit for generating an enhanced data control packet having 164 bytes of information only, and an attribute of each packet in an enhanced data control packet having only the attribute information of the enhanced data outputted from the enhanced packet generation unit; Is interleaved in the enhanced data interleaver and the enhanced data interleaver for performing enhanced data interleaving on data output from the null enhanced RS encoder. Null bit for the first and second enhanced data for the output byte A null bit header extension to be inserted and extended, a null MPEG header inserter to insert an attribute value corresponding to a 4-byte MPEG header before every 184 bytes output from the null bit extension, a map information of the current field, The E8-VSB packet multiplexer is configured to multiplex and output a general 8VSB segment and an enhanced VSB segment output from the null MPEG header inserter using a field sync signal.

The E8-VSB packet multiplexer includes the number H of the first enhanced data stream and the number Q of the second enhanced data stream in the E8-VSB map information based on the field synchronization signal output from the map information recovery unit. To obtain the number of data segments (P) assigned to the entire VSB field of the enhanced data stream (P = H + 2Q), and to enhance the general 8VSB segments by selecting the distribution method included in the E8-VSB map information. The multiple VSB segments are distributed and multiplexed.

The E8-VSB channel decoder / demultiplexer comprises: Viterbi decoding, 12-way deinterleaving, ATSC data byte deinterleaving, ATSC RS decoding for E8-VSB symbols equalized by the equalizer according to the VSB symbol attribute information, and ATSC parity removal and ATSC data for the E8-VSB data deinterleaved by ATSC data in the main data decoder and outputted in packet units by ATSC data derandomizing sequentially and decoding only general 8VSB data. It consists of an enhanced data decoder which decodes and separates the first and second enhanced data by sequentially performing derandomizing, null bit elimination, enhanced data deinterleaving, enhanced RS decoding, and enhanced stream demultiplexing. It features.

The enhanced data decoder includes an ATSC parity remover that removes an ATSC RS parity portion from the packet data of a byte unit output by ATSC byte deinterleaving from the main data decoder, and ATSC to the data from which the ATSC RS parity portion is removed. A mux packet processor for generating an ATSC data derandomizer performing a data derandomizer, a control packet including only attribute information of symbols for each byte by receiving the E8-VSB map information and the field synchronization signal of the current field. And a general 8VSB data byte, a first enhanced data byte, and a second enhancement for each byte of data output from the ASTC data derandomizer using the VSB symbol attribute information of the MUX packet processing unit. Data bytes and then separate the normal 8VSB data bytes A null bit removing unit for removing meaningless bits among all bits and the enhanced data byte and reconstructing them into meaningful first and second enhanced bytes, and a byte unit including meaningful bits output from the null bit removing unit. An enhanced data deinterleaver for performing enhanced deinterleaving on the enhanced data of the enhanced data decoder, an enhanced RS decoder for performing enhanced RS decoding on the enhanced deinterleaved data, and an output from the map information recovery unit; Enhanced stream demultiplexing for separating and outputting the enhanced RS decoded data into a first enhanced data stream and a second enhanced data stream using E8-VSB map information and a field synchronization signal. .

E8-VSB data demultiplexing method of the E8-VSB receiving system according to the present invention

(a) performing frame recovery from the received and demodulated E8-VSB data to detect a field synchronization signal indicating a field synchronization signal in the frame and an even field or an odd field;

(b) Extracting the E8-VSB map information of the current field inserted and transmitted in the unused area of the field sync signal by using the field sync signal and the field discrimination signal detected in step (a), and generating each VSB symbol attribute information. Making;

(c) receiving each VSB symbol attribute information to compensate for channel distortion included in the VSB demodulated signal; And

(d) receiving VSB symbol attribute information in synchronization with the E8-VSB symbol equalized in step (c) and using the E8-VSB map information, VSB symbol attribute information, and field synchronization signal to generate a general signal from the equalized signal. And decoding the 8VSB data and the first and second enhanced VSB data, respectively.

Step (b) is

(b-1) extracting E8-VSB map information inserted into and transmitted from a field synchronization signal from the demodulated E8-VSB data symbol by using the field synchronization signal;

(b-2) decoding the extracted E8-VSB map information with a Kerdock decoding algorithm;

(b-3) determining E8-VSB map information of a current field from the Kerdock-decoded E8-VSB map information by the field synchronization signal and the field division signal;

and (b-4) generating VSB symbol attribute information indicating the attribute of each symbol of the E8-VSB signal by the E8-VSB map information of the current field and the field synchronization signal. do.

Step (b-4) includes only attribute information of the E8-VSB symbol of the VSB byte unit using the E8-VSB map information of the current field and the field synchronization signal output in the step (b-3). Generating and outputting a control packet of a control packet; adding 20 bytes having an attribute of a general 8VSB symbol to the 188 byte control packet, and outputting the control packet of 208 bytes to an ATSC data byte; And interleaving and outputting the byte unit, and converting the interleaved byte unit data into symbol unit data to output VSB symbol attribute information.

The generating of the control packet may include determining whether the first or second enhanced data is based on a distribution type and a ratio of the first and second enhanced data packets of the current field in the E8-VSB map information of the current field. Generating an enhanced data control packet in units of 164 bytes having only attribute information, and extending the parity of 20 bytes by copying an attribute of each packet to an enhanced data control packet having only the attribute information of the enhanced data; And performing enhanced data interleaving on the data output with the parity extended in the step; and inserting null bits to fit the first and second enhanced data with respect to the bytes interleaved and output in the step. And a 4-byte MPEG header for every 184 bytes that the null bit is determined and outputted. Inserting an attribute value indicating a corresponding normal 8VSB byte, and multiplexing an enhanced VSB segment in which a general 8VSB segment and the null MPEG header are inserted and output in units of VSB segments using map information of the current field and a field synchronization signal Characterized in that it comprises a step of outputting.

In the E8-VSB packet multiplexing operation, the total enhanced data is obtained by obtaining the number H of the first enhanced data stream and the number Q of the second enhanced data stream from the E8-VSB map information based on the field synchronization signal. The stream obtains the number of data segments (P) allocated to one VSB field (P = H + 2Q), and distributes the general 8VSB segment and the enhanced VSB segment by selecting the distribution method included in the E8-VSB map information. It is characterized by multiplexing.

Step (d)

(d-1) Viterbi decoding, 12-way deinterleaving, ATSC data byte deinterleaving, ATSC RS decoding, and ATRC data derandomizing sequentially for the equalized E8-VSB symbols according to the VSB symbol attribute information Decoding only general 8VSB data by performing

(d-2) ATSC parity removal, ATSC data derandomization, null bit removal, enhanced data deinterleaving, and enhancement for E8-VSB data deinterleaved and output in packet units in step (d-1). Decoding and separating the first and second enhanced data by sequentially performing de-RS decoding and enhanced stream demultiplexing.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings illustrating the configuration and operation of the embodiment of the present invention, the configuration and operation of the present invention shown in the drawings and described by it will be described as at least one embodiment, By the technical spirit of the present invention described above and its core configuration and operation is not limited.

First, the E8-VSB transmission system and the multiplexing process disclosed in the above-described patent P03-17834 will be described with reference to the accompanying drawings to aid in understanding the E8-VSB receiving system of the present invention.

First, the above-mentioned patent can transmit MPEG-4 video or various additional data (eg program execution file, stock information, etc.) which are widely used recently through enhanced data, or existing MPEG-2 video and Dolby sound data. Can also be transmitted. In this case, the enhanced data is additionally error-corrected encoded compared to the main data, and the 1/2 enhanced data and the 1/4 enhanced data are 1/2 code rate and 1/4 code rate, respectively, than the main data. This means data in which encoding is additionally performed. Therefore, the enhanced data has a much better reception performance than the main data due to noise and multipath interference occurring in the channel. In particular, the 1/4 enhanced data coded at 1/4 code rate is 1/2. It has better performance than 1/2 enhanced data encoded at a code rate.

Referring to FIG. 3, the main and enhanced data multiplexing processor 301 multiplexes 1/2 enhanced data and 1/4 enhanced data in packet units, and then multiplexes the multiplexed enhanced data and main data in segment units. After that, the signal is output to the first encoder 303. The first encoder 302 includes a randomizer 302-1, a Reed-Solomon encoder 302-2, and a byte interleaver 302-3 at an output terminal of the main and enhanced data multiplexing processor 301. The data packets output from the main and enhanced data multiplexing processing units 301 are sequentially performed to perform data randomization, Reed Solomon coding, and data interleaving, and then output to the symbol processing unit 303. The symbol processing unit 303 converts the data in the unit of the byte interleaved and output from the first encoder 302 into a symbol, performs convolutional coding only on the enhanced data symbol, and converts the symbol into the data in the unit of byte again. After that, it is output to the first decoder 304.

The first decoder 304 sequentially processes the byte deinterleaver 304-1, the Reed-Solomon parity remover 304-2, and the derandomizer 304-3 at the output terminal of the symbol processor 303. The data deinterleave, the Reed Solomon parit removal, and the derandomize operation are sequentially performed on the data of the byte unit output from the symbol processing unit 303 and then output to the 8VSB transmitter 100.

The 8VSB transmitter 100 is identical to the configuration of FIG. 1 described above, and sequentially performs Reed-Solomon encoding, data interleaving, trellis encoding, etc. on the data from which the Reed-Solomon parity is removed in the first decoder 304. To do it.

4 is a detailed block diagram of the main and enhanced data multiplexing processing unit 301. The main data is added to the multiplexed enhanced data after multiplexing 1/2 enhanced data and 1/4 enhanced data in packet units. Multiplex on a segment basis. In this case, in the VSB transmission system, a frame constituting one screen is composed of two data fields, each field is composed of one field sync segment and 312 data segments, and one data segment is synchronized with four symbols of data segments. It consists of a signal and data of 828 symbols.

In FIG. 4, the main data buffer 401 temporarily stores main data input in packets of 188 byte units and outputs the main data to the multiplexer 405. The 1/2 enhanced data buffer 402 temporarily stores 1/2 enhanced data input in packets of 188 byte units, and the 1/4 enhanced data buffer 403 is 1 input in packets of 188 byte units. / 4 Temporarily stores the enhanced data and outputs the enhanced data to the enhanced data preprocessing unit 404.

The enhanced data preprocessing unit 404 may include 1/2 enhanced data output from the 1/2 enhanced data buffer 402 and 1/4 enhanced data output from the 1/4 enhanced data buffer 403. The signal is multiplexed in packet units according to a predetermined rule, and the multiplexed enhanced data is converted into the same structure as the MPEG transport packet of the main data and output to the multiplexer 405.

The multiplexer 405 combines the main data packet output from the main data buffer 401 and the enhanced data packet output from the enhanced data preprocessor 404 into the main / enhanced data multiplexing information inserted into the field synchronization signal. Therefore, multiplex by segment unit.

At this time, in the E8-VSB transmission system, when the number of enhanced data packets to be transmitted in one VSB data field is determined, the main / enhanced data multiplexing map related to the multiplexing rule and the number of transmitted packets of the enhanced data in the unused area in the field sync segment ( MAP) information (hereinafter, referred to as E8-VSB map information) is inserted and transmitted to allow accurate demultiplexing in accordance with field synchronization in the E8-VSB receiving system.

FIG. 5A illustrates a general VSB data frame format in which one frame is divided into an odd field and an even field, and each field is further divided into 313 data segments. The 313 data segment includes one field sync segment and a general data segment of 312 including a training sequence signal.

And, one data segment consists of 832 symbols. In this case, the first 4 symbols in one data segment are segment sync parts, and the first data segment in a field is field sync parts.

One field sync signal has a length of one data segment, as shown in FIG. 5B, and a data segment sync pattern exists in the first four symbols, and then a pseudo random sequence. PN 511, PN 63, PN 63, and PN 63 are present, followed by VSB mode-related information in the next 24 symbols. Here, the polarity of the second PN 63 of the three PN 63 section is changed each time. That is, '1' is changed to '0' and '0' is changed to '1'. Therefore, one frame may be divided into an even / odd field according to the polarity of the second PN 63.

The remaining 104 symbols after the 24 symbols in which the VSB mode related information is present are not used. The last 12 symbols of the unused area are copied with the last 12 symbols of the previous segment.

The present invention inserts and transmits E8-VSB map information including main / enhanced data multiplexing information related to the multiplexing rule and the number of transmitted packets of enhanced data in the first 64 symbols of the unused regions in the field sync segment of FIG. 5B. do.

That is, 64 two-level symbols of unused regions in the field sync segment are used to transmit E8-VSB Enhanced segment locations during Enhanced transmission. The E8-VSB map information is coded and inserted into Kerdock (64, 12) codes. The polarity of the Kerdock codeword is inverted in an even (negative PN63) data field. Here, since the Kerdock coding algorithm is a known technique, detailed description thereof will be omitted.

6 is a detailed block diagram of the enhanced data preprocessing unit 404. The 1/2 MPEG packet converter 501 converts 1/2 enhanced data input in packets of 188 byte units into 164 byte units without changing data. The 1/4 MPEG packet converter 502 divides the 1/4 enhanced data inputted into packets of 188-byte units into 164-byte units without changing the data and outputs the multiplexer 503 to the multiplexer 503. do.

The multiplexer 503 field-synchronizes 1/2 enhanced data and 1/4 enhanced data in units of 164 bytes output from the 1/2 MPEG packet converter 501 and the 1/4 MPEG packet converter 502. Multiplexing is performed on a packet basis according to the E8-VSB multiplexing map information in the segment and output to the enhanced Reed-Solomon encoder 504. The enhanced Reed-Solomon encoder 504 adds 20 bytes of parity codes by encoding Reed Solomon to the enhanced data multiplexed by the multiplexer 503, thereby adding 164 bytes of enhanced data in units of 184 bytes. After the packet is converted into a packet, it is output to the enhanced data interleaver 505. The enhanced data interleaver 505 reverses the order of the data output from the enhanced Reed-Solomon encoder 504 to increase the performance against burst noise and outputs the result to the null bit inserter 506. The 506 inserts null bits corresponding to the 1/2 enhanced data or the 1/4 enhanced data output from the data interleaver 505 to expand the packet, and outputs the packet to the MPEG header inserter 507. . The MPEG header inserter 507 inserts a 4-byte MPEG header in front of every 184 byte units of the enhanced data into which null bits are inserted in the null bit inserter 506, which is identical to the MPEG transport packet of the main data. After the format is made, it is output to the multiplexer 405. This is to ensure that when an enhanced data packet is received from the existing VSB receiver, the PID is checked and the packet is discarded.

The null bit inserter 506 inserts a predetermined null bit between each bit when the 1/2 enhanced data of one byte is input, and expands the data into two bytes, and when the 1/4 enhanced data of one byte is input. It repeats each bit twice and inserts a predetermined null bit between each bit to expand it into 4 bytes. These null bits are later replaced by parity bits by the convolutional encoder of the symbol processing unit 303.

The multiplexing information in which 1/2 enhanced data and 1/4 enhanced data are multiplexed in the multiplexer 503 of the enhanced data preprocessor 404 and the multiplexer of the main and enhanced data multiplexing processor 301 In 405, the multiplexing information in which the main data and the enhanced data are multiplexed is referred to as E8-VSB map information in the present invention, and the E8-VSB map information is Kerdock-coded as described above to store a reserved bit in the field sync segment. Inserted and sent).

Next, a method of multiplexing 1/2 enhanced data and 1/4 enhanced data in the multiplexer 503 of the enhanced data preprocessor 404 will be described in detail.

That is, define H and Q as the number of 1/2 enhanced data packets (ie, 164 bytes) and 1/4 enhanced data packets (ie, 164 bytes) multiplexed into one VSB data field.

At this time, in the null bit inserter 506 of FIG. 6, when one byte of 1/2 enhanced data is input, the null bit is inserted and 2 bytes are output. When the 1/4 bit of one byte enhanced data is input, the null bit is inserted. Is inserted and 4 bytes are output. Therefore, since there are 312 data segments in one VSB data field, the maximum value of H becomes 156 (= 312/2) when multiplexing only half-enhanced data and transmitting the same data. When transmitting, the maximum value of Q is 78 (= 312/4). In other words, if only 1/2 enhanced data is transmitted, up to 156 packets (1 packet = 164 bytes) can be transmitted. If only 1/4 enhanced data is transmitted, up to 78 packets (1 packet = 164 bytes) can be transmitted.

If this is expressed as general expression, it becomes as follows.

N + 2H + 4Q = 312

Here, the number of data segments in one field of VSB is 312, which is the general expression of 8VSB segments (N), the number of packets of the first enhanced stream (H), and the number of packets of the second enhanced stream (Q). It is like addition.

In the above-described patent, when the values of H and Q are determined, the multiplexer 503 of FIG. 6 proposes a method of multiplexing a 1/2 enhanced data packet and a 1/4 enhanced data packet.

The first method is to uniformly multiplex the 1/2 enhanced data packet and the 1/4 enhanced data packet at equal intervals as shown in FIG. 7A.

In the second method, as shown in FIG. 7B, the 1/2 enhanced data packet and the 1/4 enhanced data packet are separately collected and multiplexed. In FIG. 7B, 1/2 enhanced data packets are collected and output for one data field, and then 1/4 enhanced data packets are collected and output.

The third method is alternately multiplexing the 1/2 enhanced data packet and the 1/4 enhanced data packet one by one as shown in FIG. 7C. In FIG. 7C, when the 1/2 enhanced data packet and the 1/4 enhanced data packet are multiplexed alternately, and any one enhanced data packet is multiplexed, only the other one is multiplexed.

That is, FIG. 7 illustrates a method of multiplexing 1/2 enhanced data packet and 1/4 enhanced data packet to be transmitted in one VSB data field when H = 8 and Q = 2.

As such, when the number of packets H and the number of data packets Q of 1/2 enhanced data transmitted in one VSB data field are determined, 1/2 is used in the unused area in the field sync segment. E8-VSB receiving system while inserting enhanced data packet number and 1/4 enhanced data packet number and E8-VSB map information related to the rule to be used for multiplexing among the multiplexing methods described above and outputting to multiplexer 503 To send. The multiplexer 503 then multiplexes the 1/2 enhanced data packet and the 1/4 enhanced data packet with a multiplexing rule according to the enhanced data multiplexing information in the field sync segment. Here, the rule to be used for multiplexing may be fixed to either, or may be adaptively determined according to the number of 1/2 enhanced data packets and 1/4 enhanced data packets multiplexed in one VSB data field.

At this time, if any one of the above three methods is adopted and used in the E8-VSB transmission system of the present invention, only the values of H and Q need to be included in the E8-VSB map information in the field synchronization signal. However, if all three methods are used selectively, or if two methods are used selectively, information on how to multiplex should be added to the E8-VSB map information in the field synchronization signal.

That is, the E8-VSB map information of the multiplexed information area allocated to the unused area in the field sync segment includes information on the number of transmission packets of 1/2 enhanced data and 1/4 enhanced data in one data field. Information on which rule is multiplexed with the 1/2 enhanced data and the 1/4 enhanced data, and with which rules the enhanced data and the main data are multiplexed should be inserted.

8 is a schematic diagram of an E8-VSB receiving system of the present invention for receiving an E8-VSB signal multiplexed and transmitted in an E8-VSB transmission system as shown in FIGS. 3 to 7 described above.

8, tuner 601, IF mixer 602, demodulator 603, equalizer 604, map information recovery unit 605, and E8-VSB channel decoder / demultiplexer 606. It is composed. Here, the configuration and operation of the tuner 601, the IF mixer 602, and the demodulator 603 described above are the same as in FIG.

That is, when the E8-VSB modulated RF signal is received through the antenna, the tuner 601 selects only the RF signal of the desired channel by tuning, converts it into an IF signal, and outputs the IF signal to the IF mixer 602. The IF mixer 602 down-converts the IF signal output from the tuner 601 to a baseband signal and outputs the demodulator 603. The demodulator 603 demodulates the baseband signal after VSB demodulation. Output to the unit 604 and the map information recovery unit 605. The map information recovery unit 605 restores the E8-VSB map information inserted into the unused area of the field sync segment and outputs the same to the equalizer 604 and the E8-VSB channel decoder / demultiplexer 606. . The equalizer 604 compensates for the channel distortion included in the VSB demodulated signal by receiving the output of the E8-VSB channel decoder / demultiplexer 606 and the map information recovery unit 605 at a later stage. The signal is output to the E8-VSB channel decoder / demultiplexer 606. That is, the equalizer 604 performs the improved equalization using the output of the map information recovery unit 605, and the E8-VSB channel decoder / demultiplexer 606 can decode the channel suitable for the currently received mode. have.

9 is a detailed block diagram of the map information recovery unit 605. The map information extraction unit 701 extracts E8-VSB map information from the data symbols output from the demodulation unit 603. The extracted E8- Kerdock decoder 702 which decodes VSB map information by Kerdock decoding algorithm, and performs frame recovery from the data symbol output from the demodulator 603 to output a field synchronizing signal and a field discriminating signal indicating whether the field is an even field or an odd field. A frame recovery unit 704, a current map determination unit 703 which receives the E8-VSB map information decoded by the Kerdock decoder 702, the field synchronization signal, and the field separation signal to determine a current map, and the current And a symbol attribute information generation unit 705 for generating attribute information of the current VSB symbol according to the map information and the field synchronization signal.

The map information recovery unit 605 performs the operation of extracting the E8-VSB map information inserted in the field synchronization section in the E8-VSB transmission system. In addition, the symbol attribute information generation unit 705 of the map information recovery unit 605 generates information indicating the attribute of each VSB symbol so that the equalizer 604 and the E8-VSB channel decoder / demultiplexer 606 In this case, the performance of the equalizer 604 and the E8-VSB channel decoder / demultiplexer 606 is improved.

In the present invention configured as described above, the map information recovery unit 605 shown in FIG. 8 is essential to receive the E8-VSB signal. At this time, the map information recovery unit 605 may receive both the signal input to the equalizer 604 or the output signal of the equalizer 604 as input.

Next, an example of using the input / output signal of the equalizer 604 in the map information recovery unit 605 will be described.

In the first method, the input signal and the output signal of the equalizer 604 may be selectively converted into the input data of the map information recovery unit 605 by referring to the operation of the equalizer 604 and the output SNR of the rear end of the equalizer 604. Can be used. The second method may include two map information recovery units to derive the E8-VSB map information of the currently received signal using the reliability of the outputs of both map information recovery units. The third method may be used as input data of the map information recovery unit 605 by synchronizing signals of both input / output of the equalizer 604.

At this time, the above-described map information recovery unit 605 must first synchronize the frame of the VSB signal to know the E8-VSB map information representing the E8-VSB signal from the received signal. Accordingly, the frame recovery unit 704 performs frame recovery from the input data symbol to detect the field synchronization signal and the field separation signal indicating whether the current field is an even field or an odd field, and then map information extracting unit 701 and the present. The map determination unit 703 and the symbol attribute information generation unit 705 output the result. That is, whether the current field is an even field or an odd field can be detected using the polarity of the second PN 63 among the training signals of the field synchronization signal interval.

The map information extracting unit 701 receives the field synchronizing signal from the frame recovery unit 704 and indicates that the input data symbol is the field synchronizing signal, and then extracts the E8-VSB map information included in the field synchronizing signal section to generate Kerdock. Output to decoder 702.

In this case, since the extracted E8-VSB map information is encoded and transmitted by the Kerdock coding algorithm specified in the E8-VSB standard in the E8-VSB transmitting system, the Kerdock decoder 702 uses the extracted E8- by the Kerdock decoding algorithm. The VSB map information is decoded and then output to the current map determination unit 703. The current map determination unit 703 divides the Kerdock-decoded E8-VSB map information by the field synchronization signal and the field separation signal output from the frame recovery unit 704 into E8-VSB map information of even and odd fields. Again, the E8-VSB map information of the current field is determined. The determined E8-VSB map information of the current field is output to the E8-VSB channel decoder / demultiplexer 606 and to the symbol attribute information generator 705.

The symbol attribute information generation unit 705 generates a signal indicating an attribute of each symbol of the VSB signal based on the E8-VSB map information of the current field. That is, it distinguishes whether it is a general 8VSB symbol, that is, a main data symbol or an enhanced data symbol, and in the case of an enhanced data symbol, indicates whether the symbol is encoded at a 1/2 code rate or a symbol encoded at a 1/4 code rate. Generates attribute information of the VSB symbol and outputs the attribute information to the equalizer 604 and the E8-VSB channel decoder / demultiplexer 606.

FIG. 10 is a detailed block diagram of the symbol attribute information generation unit 705. The control packet includes E88-VSB map information of a current field and a field synchronization signal, and is composed of 188 bytes and includes only symbol attribute information for each byte. A mux packet processing unit 801 for outputting an ATSC RS encoder for outputting a control packet of 208 bytes by adding a parity amount of the ATSC RS encoder to the 188 byte control packet, that is, a byte having an attribute of a 20-byte general VSB symbol. 802), an ATSC data interleaver 803 interleaving the 208 byte control packet, and a byte-symbol converter 804 converting the interleaved byte data into symbol data and outputting VSB symbol attribute information. It is composed. The symbol-based VSB symbol attribute information is operated by being connected to one VSB symbol input from the Viterbi decoder of the equalizer 604 and the E8-VSB channel decoder / demultiplexer 606.

The symbol attribute information generation unit 705 configured as described above generates attribute information of each symbol as shown in FIG. 10 using the field synchronization signal and the E8-VSB map information of the current field.

That is, the mux packet processing unit 801 receives the field synchronization signal and the E8-VSB map information of the current field and outputs a control packet composed of 188 bytes to the null ATSC RS encoder 802. The control packet does not include data information and is a control packet including only attribute information for each byte. This attribute also determines whether each byte is a byte of general VSB data, a byte of 1/2 enhanced data encoded at a 1/2 code rate, or a byte of 1/4 enhanced data encoded at a 1/4 code rate. Distinguish 12 is a detailed block diagram of the mux packet processing unit 801, which will be described in detail later.

The null ATSC RS encoder 802 adds a parity amount of the ATSC RS encoder, that is, a byte having an attribute of 20 bytes of general VSB symbols, to the control packet in units of 188 bytes, and adds 208 bytes of the control packet to the ATSC data interleaver 803. ) The ATSC data interleaver 803 outputs the control packet of 208 bytes to the byte-symbol converter 804 through the ATSC data interleaving process. The byte-symbol converter 804 converts the interleaved byte data into symbol data and outputs VSB symbol attribute information. The bit-by-bit VSB symbol attribute information is operated by being connected to one VSB symbol input from the Viterbi decoder of the equalizer 604 and the E8-VSB channel decoder / demultiplexer 606.

The equalizer 604 may receive the respective attributes of the currently input VSB symbol from the map information recovery unit 605 to exhibit an improved equalization capability than the conventional equalizer. In addition, by feeding back the symbol determination value of the enhanced E8-VSB channel decoder / demultiplexer 606 to the equalizer 604, it is possible to accurately generate an error value required for equalization, thereby improving the performance of the equalizer. Can be. That is, since the reliability of the enhanced symbols is higher than that of the existing VSB symbol, the equalizer 604 may improve the equalization performance by using the above two pieces of information (that is, attribute information of the VSB symbol and symbol determination value). Will be.

Meanwhile, the E8-VSB channel decoder / demultiplexer 606 has a separate data path for receiving an enhanced stream in addition to the general VSB stream as shown in FIG. 11. That is, the received signal is decoded or separated in the corresponding mode by using the E8-VSB map information and the VSB symbol attribute information indicating the multiplexing information of the currently received E8-VSB signal. Both the stream (MPEG TPS # 1), the 1/2 enhanced stream (MPEG TPS # 2) and the 1/4 enhanced stream (MPEG TPS # 3), which are enhanced VSB streams, can be received. Herein, the mode refers to any one of the existing ATSC 8VSB data, 1/2 enhanced VSB data, and 1/4 enhanced VSB data.

11 is a detailed block diagram of the E8-VSB channel decoder / demultiplexer 606. The main data decoder 900 separates and decodes general 8VSB data (MPEG TPS # 1) from an equalized signal. After the data is separated and decoded, the enhanced data decoder 950 divides the data into 1/2 enhanced data (MPEG TPS # 2) and 1/4 enhanced data (MPEG TPS # 3). Here, the main data decoder 900 is a data path for decoding existing 8VSB data, and the enhanced data decoder 950 is a data path for decoding 1/2, 1/4 enhanced data.

The main data decoder 900 includes a Viterbi decoder / data deinterleaver 901, an ATSC byte deinterleaver 902, an ATSC RS decoder 903, and an ATSC data derandomizer 904.

That is, the general 8VSB symbol equalized by the equalizer 604 is the Viterbi decoder / 12-way deinterleaver 901 and the ATSC byte deinterleaver 902 of the main data decoder 900 as in the conventional 8VSB channel decoder. Decoded into a general 8VSB stream (MPEG TPS # 1) via the ATSC RS decoder 903 and the ATSC data derandomizer 904. Since the existing 8VSB stream is determined to be a stream in which only 8VSB exists by the E8-VSB map information recovery unit, and is always indicated as a general 8VSB symbol through VSB symbol attribute information, it is received along the path of the conventional channel decoding method as described above. can do.

However, in the case of the E8-VSB signal, since the 8VSB signal and the enhanced VSB signal are multiplexed, two changes occur in the channel decoder. One is that the Viterbi decoder needs to perform decoding for each attribute based on the attributes of the VSB symbol, and the other is that there must be a separate data path for the enhanced VSB (EVSB) stream.

The enhanced data decoder 950 is a data path for receiving and decoding the EVSB stream. The enhanced data decoder 950 includes an ATSC RS parity remover 951, an ATSC data derandomizer 952, a null bit remover 953, An enhanced data deinterleaver 954, an enhanced RS decoder 955, an enhanced stream demultiplexer 956, and a mux packet processor 957 are configured.

Referring to the E8-VSB channel decoder / demultiplexer 606 of FIG. 11 configured as described above, the E8-VSB symbol equalized by the equalizer 604 and the VSB symbol attribute information generated by the map information recovery unit 605 are synchronized. And input to the Viterbi decoder / 12-way deinterleaver 901.

At this time, since the equalized symbol input to the Viterbi decoder / 12-way deinterleaver 901 is mixed with the general 8VSB symbol and the EVSB symbol, the Viterbi decoder uses the VSB symbol attribute information to determine the general 8VSB symbol and the EVSB symbol. Classify and perform Viterbi decoding accordingly. In addition, 12-way deinterleaving is performed along with the Viterbi decoding to output a byte unit result to the ATSC data deinterleaver 902. The value determined during the decoding process in the Viterbi decoder is fed back to the equalizer 604. The ATSC byte deinterleaver 902 deinterleaves the data in units of bytes output from the Viterbi decoder / 12-way deinterleaver 901.

That is, the ATSC byte deinterleaver 902 deinterleaves the byte output to the output of the Viterbi decoder / 12-way deinterleaver 901 in the reverse process of the ATSC byte interleaver of FIG. 3. Output as data. The deinterleaved data can be divided into segment units, and can be divided into general 8VSB data segments and EVSB data segments. The data output from the ATSC byte deinterleaver 902 is equally input to the ATSC RS decoder 903 and the ATSC RS parity remover 951 of the enhanced data decoder 950.

The ATSC RS decoder 903 performs RS decoding on the data segment that is the output of the ATSC byte deinterleaver 902 in the reverse process of the ATSC RS encoder of FIG. 3 to output to the ATSC data derandomizer 904. do.

When the ATSC RS decoded data is derandomized by the ATSC data derandomizer 904, an 8VSB signal, that is, MPEG TPS # 1 is finally output. That is, since the EVSB streams maintain the same shape as the normal 8VSB stream in the main data decoder 900, they are decoded without abnormality and appear as meaningless empty packets when observed in the existing MPEG TP stream. There will be no problem.

The ATSC RS parity remover 951 of the enhanced data decoder 950 removes an ATSC RS parity portion from a data segment of a byte unit output from the ATSC byte deinterleaver 902, and then ATSC data derandomizer 952. ) That is, since the enhanced VSB does not use the ATSC parity portion, the portion can be removed.

The ATSC data derandomizer 952 performs a derandomizer in a reverse process of the ATSC randomizer 302-1 of FIG. 3 with respect to the data from which the ATSC RS parity part is removed, and then removes a null bit ( 953).

The null bit removing unit 953 is a byte used for a general VSB stream, a byte for an EVSB stream, or 1/1 for an EVSB stream for each byte of data output from the ASTC data derandomizer 952. Whether the byte is for a 2-enhanced data stream or a 1 / 4-enhanced data stream is distinguished, and the corresponding meaningless bits are removed and reconstructed into meaningful bytes, then the enhanced data deinterleaver 954 Will output Here, each byte is classified into a general VSB stream, a 1/2 enhanced data stream, and a 1/4 enhanced data stream by VSB byte attribute information output from the mux packet processing unit 957.

First, in case of normal VSB byte, each bit is completely removed. At this time, the MPEG header inserted in the 1/2 and 1/4 enhanced data is also removed because it is 8VSB. Meanwhile, the EVSB byte is reconfigured as shown in FIGS. 13 and 14. Therefore, in the null bit inserting unit 953, general 8VSB data is ignored, and only 1/2 and 1/4 enhanced data are output.

That is, in the case of 1/2 enhanced data, one byte in the E8-VSB transmission system is extended to two bytes by inserting null bits as shown in FIG. 13B, thereby removing meaningless bits (ie, null bits) in FIG. 13B. 11A is reconstructed into a meaningful byte form as shown in FIG. 11A. In the case of 1/4 enhanced data, bits are overlapped one by one in the E8-VSB transmission system as shown in FIG. 14B and expanded to four bytes by inserting null bits. Bit and null bits) to reconstruct consecutive four quarter enhanced data bytes into a meaningful one byte form as shown in FIG. 14A.

The enhanced data deinterleaver 954 is a reverse process of the enhanced data interleaver 505 of FIG. 6 with respect to EVSB byte data composed of all meaningful bits output from the null bit removing unit 953. After the deinterleaving is performed, the signal is output to the enhanced RS decoder 955. The enhanced RS decoder 955 decodes the deinterleaved data in the reverse process of the enhanced RS encoder 504 of FIG. 6 and outputs the decoded data to the enhanced stream demultiplexer 956.

The enhanced stream demultiplexer 956 uses the E8-VSB map information and the field synchronization signal output from the map information recovery unit 605 to convert the enhanced RS decoded data into a 1/2 enhanced data stream and 1. It separates into / 4 enhanced data stream and outputs to MPEG TPS # 2 and MPEG TPS # 3, respectively. In this case, a separating rule is described with reference to FIG. 15, and a method of generating an enhanced data packet having enhanced data attribute information will be described with reference to the enhanced packet generator of FIG. 12. In this way, the E8-VSB signal can be received to receive MPEG TPS # 1, a general VSB stream, 1/2 EVSB stream (MPEG TPS # 2) and 1/4 EVSB stream (MPEG TPS # 3), which are enhanced VSB streams. .

That is, the above-described mux packet processing unit 801 of FIG. 10 and the mux packet processing unit 957 of FIG. 11 have the same function, and a detailed block diagram thereof is shown in FIG. 12.

In the present invention, the mux packet processing unit is separately configured in the symbol attribute information generation unit 705 and the E8-VSB channel decoder / demultiplexer 606. However, only one mux packet processing unit is configured and the outputs of the mux packet processing unit are respectively synchronized. It can also be used in the block.

12 is a detailed block diagram of the mux packet processing units 801 and 957. The E8-VSB map information and the frame recovery unit of the current field determined by the current map determination unit 703 of the map information recovery unit 605 are described. Attribute information in units of VSB bytes is generated using the field synchronization signal recovered in step 704. The attribute information in units of VSB bytes indicates whether the current byte is a general VSB byte, an enhanced VSB byte, or, if an enhanced VSB byte, a 1/2 enhanced data byte encoded at a 1/2 code rate, and a 1/4 code rate Provides information about whether the 1/4 enhanced data byte is encoded with.

To this end, the mux packet processor includes an enhanced packet generator 1011, a null enhanced RS encoder 1012, an enhanced data interleaver 1013, a null bit extension unit 1014, a null MPEG header inserter 1015, And an E8-VSB packet multiplexer 1016.

That is, the enhanced packet generator 1011 generates a control packet having only attribute information on whether 1/2 enhanced data or 1/4 enhanced data is generated. The VSB map information determines the distribution type and ratio of 1/2 and 1/4 enhanced data streams of the enhanced VSB packet of the current field. 15A and 15B illustrate a case in which the number of packets of the 1/2 enhanced data stream is 8 and the number of packets of the 1/4 enhanced data stream is 2 for the two types of distributions proposed by the E8-VSB standard. . That is, FIG. 15A illustrates an example of multiplexing a 1/2 enhanced data packet and a 1/4 enhanced data packet separately and grouping multiplexing. FIG. 15B illustrates a 1/2 enhanced data packet and a 1/4 enhanced data packet. An example of alternate multiplexing of data packets one by one is shown.

In this case, rather than generating a signal including meaningful data, the enhanced packet generator 1011 generates a control signal for which attribute each of the enhanced packets has 1/2 or 1/4. The control signal may be a path through enhanced data, that is, a null enhanced RS encoder 1012, an enhanced data interleaver 1013, a null bit extension 1014, a null MPEG header inserter 1015, and an E8-. The VSB packet multiplexer 1016 outputs the final VSB byte attribute signal.

That is, a control packet of 164 bytes having only attribute information of enhanced data output from the enhanced packet generation unit 1011 is input to a null enhanced RS encoder 1012, and 20 bytes of parity are added to 184 bytes of information. Output the control packet. In this case, since the parity added to the parity region is for matching, the attribute of each packet is copied and extended by the parity amount. That is, in a general data path, parity generated by performing actual enhanced RS encoding is added. However, the null enhanced RS encoder 1012 copies and extends an attribute of each packet by a parity amount in a parity region.

The output of the null enhanced RS encoder 1012 is input to the enhanced data interleaver 1013, interleaved, and then output to the null bit extension 1014. This interleaving process performs the same task as the enhanced data interleaver 505.

The null bit extension unit 1014 extends the byte output interleaved by the enhanced data interleaver 1013 to 1/2 or 1/4 enhanced data as shown in FIG. 13 or 14. That is, in the null bit extension unit 1014, if the byte having the meaning of the current control signal is a byte having 1/2 attribute information and is configured as shown in FIG. 13A, the null bit extension unit 1014 inserts a null bit and expands to 2 bytes as shown in FIG. 13B. If the byte has 1/4 attribute information and is configured as shown in FIG. 14A, the byte is expanded to 4 bytes through bit redundancy and null bit insertion as shown in FIG. 14B, and then output to the null MPEG header inserter 1015. In this case, the extended byte means an attribute of the VSB byte, and thus, unlike the null bit extension of the transmitter, all of the values of b7 to b0 have the same value.

The null MPEG header inserter 1015 adds a value indicating that it is a general VSB byte corresponding to a 4-byte MPEG header for every 184 bytes output from the null bit extension unit 1014 in order to adjust the number of digits to 188 bytes. Thereafter, the signal is output to the E8-VSB packet multiplexer 1016. The E8-VSB packet multiplexer 1016 outputs packets in units of VSB segments, and multiplexes 8VSB segments and enhanced VSB segments. In this case, the E8-VSB packet multiplexer 1016 may determine the number (H) and 1 of 1/2 enhanced data streams in the E8-VSB map information based on the field synchronization signal output from the map information recovery unit 605. Obtain the number (Q) of / 4 enhanced data streams to obtain the number of data segments (P) assigned to the entire VSB field (P = H + 2Q), and are included in the E8-VSB map information. According to the distribution method selection, 8VSB segments and EVSB segments are distributed and multiplexed as shown in FIG. 16A in the case of pattern distribution and FIG. 16B in the case of process distribution. 16A and 16B, s corresponds to an enhanced segment as a number of data segments coming after the field sync segment. In this case, a signal indicating a general 8VSB byte is output in an 8VSB segment order, and a signal output from the null MPEG header inserter 1015 is output in an EVSB segment order to output final VSB byte attribute information.

As described above, according to the digital E8-VSB receiving system and the E8-VSB data demultiplexing method according to the present invention, the 1/2 code rate and the 1/4 code rate in the new E8-VSB transmission system compatible with the existing ATSC 8VSB system Encode the encoded enhanced data into the MPEG transport packet format by multiplexing the encoded 1/2 and 1/4 enhanced data in packet units according to a predetermined multiplexing rule, and then converting the format-converted enhanced data. When the main data and the main data are multiplexed again in units of segments according to a predetermined multiplexing rule, the E8-VSB receiving system of the present invention can completely receive the E8-VSB signal together with the ATSC 8VSB signal.

In addition, the E8-VSB transmission system extracts the E8-VSB map information inserted and inserted into the field synchronization section and generates information indicating the attributes of each VSB symbol, and then generates a general 8VSB signal and 1/2, 1 in the channel decoder. By separating and decoding the / 4 enhanced VSB signal and using the VSB symbol attribute information for channel equalization, it is possible to improve the performance of the equalizer, thereby improving the performance of the E8-VSB receiving system.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

1 is a block diagram showing a typical ATSC 8VSB transmission system

2 is a block diagram showing a typical ATSC 8VSB receiving system

3 is a block diagram showing an E8-VSB transmission system according to the present invention;

4 is a detailed block diagram of a main and enhanced data multiplexing processor of FIG. 3;

5a is a view showing the structure of a data frame of a general digital TV

FIG. 5B illustrates the structure of the field sync signal of FIG. 5A

6 is a detailed block diagram of the enhanced data preprocessor of FIG. 4.

FIG. 7A illustrates an example of multiplexing a 1/2 enhanced data packet and a 1/4 enhanced data packet by a uniform method.

FIG. 7B illustrates an example of multiplexing a 1/2 enhanced data packet and a 1/4 enhanced data packet by grouping.

7C illustrates an example of multiplexing a 1/2 enhanced data packet and a 1/4 enhanced data packet in an alternating manner.

8 is a block diagram showing an E8-VSB receiving system according to the present invention;

9 is a detailed block diagram of the map information recovery unit of FIG. 8;

FIG. 10 is a detailed block diagram of the symbol attribute information generation unit of FIG. 9. FIG.

FIG. 11 is a detailed block diagram of the E8-VSB channel decoder / demultiplexer of FIG. 8. FIG.

12 is a detailed block diagram of the mux packet processor of FIGS. 10 and 11;

13 (a) and 13 (b) show an example of byte expansion and removal of 1/2 enhanced data.

(A) and (b) of FIG. 14 show examples of byte expansion and removal of quarter enhanced data.

FIG. 15A illustrates an example of distribution of a grouped scheme as an example of multiplexing a 1/2 enhanced data packet and a 1/4 enhanced data packet.

FIG. 15B is a diagram illustrating an example of a distribution of an alternating scheme as an example of multiplexing a 1/2 enhanced data packet and a 1/4 enhanced data packet. FIG.

FIG. 16A illustrates an example of multiplexing rules of an 8VSB data packet and an enhanced data packet, and illustrates an example of distribution having a pattern according to a condition.

FIG. 16B illustrates an example of multiplexing rules of an 8VSB data packet and an enhanced data packet, and shows a uniform distribution example. FIG.

Explanation of symbols for main parts of the drawings

601: RF Tuner 602: IF Mixer

603: demodulator 604: enhanced equalizer

605: map information recovery unit 606: E8-VSB channel decoder / demultiplexer

701: map information extraction unit 702: Kerdock decoder

703: current map determination unit 704: frame recovery unit

705: symbol attribute information generation unit 801: mux packet processing unit

802: null ATSC RS encoder 803: ATSC data interleaver

804: byte-symbol converter 900: main data recovery unit

950: enhanced data recovery unit 1011: enhanced packet generation unit

1012: null enhanced RS encoder 1013: enhanced data interleaver

1014: null bit expansion unit 1015: null MPEG header insertion unit

1016: E8-VSB packet multiplexer

Claims (25)

Multiplexing of E8-VSB Map Information Inserted into the Unused Region of the Field Synchronization Signal by the E8-VSB Transmission System Inserting First Enhanced Data Encoded at 1/2 Code Rate and Second Enhanced Data Encoded at 1/4 Code Rate According to a rule, the packet is multiplexed in units of packets and converted into a format of an MPEG transport packet, and the format-converted enhanced data and main data are segmented according to a multiplexing rule of E8-VSB map information inserted in an unused region of the field sync signal. In the E8-VSB receiving system for transmitting the multiplexed E8-VSB signal in units, A tuner for selecting an RF signal of a desired channel by tuning and converting the signal to an IF signal when the E8-VSB modulated RF signal is received through an antenna; A demodulator for converting an IF signal output from the tuner into a baseband signal and outputting the result in a transport (TP) packet form; Frame recovery is performed from the output of the demodulator to detect the field sync signal and the field discrimination signal in the frame, and the E8-VSB map inserted and transmitted into the unused area of the field sync signal using the detected field sync signal and the field discrimination signal. A map information recovery unit which extracts and decodes the information and generates each VSB symbol attribute information; A channel equalizer which receives respective VSB symbol attribute information of the map information recovery unit and compensates for channel distortion included in the VSB demodulated signal; And E8 which decodes general 8VSB data and first and second enhanced VSB data from the signal equalized by the channel equalizer using E8-VSB map information, VSB symbol attribute information, and field synchronization signal of the map information recovery unit, respectively. An E8-VSB receiving system comprising a VSB channel decoder / demultiplexer. The method of claim 1, The E8-VSB map information is Kerdock coded and inserted into an unused area of the field sync signal, and the number of packets of the first and second enhanced data transmitted in one field is determined, and the determined first and the first 2. E8-VSB receiving system, characterized in that it includes multiplexing rule information of enhanced data, multiplexing rule information of enhanced data and main data. The method of claim 1, wherein the map information recovery unit Frame recovery, E8-VSB map information decoding, and VSB symbol attribute information are received by receiving any one of an input signal and an output signal of the equalizer by referring to the operation of the equalizer and the output signal-to-noise ratio (SNR) at the rear end of the equalizer. Generating an E8-VSB receiving system. The method of claim 1, wherein the map information recovery unit A plurality of map information recovery units having the same configuration are arranged, and the field synchronization signal, the field separation signal, the E8-VSB map information decoding, and the VSB symbol attribute information are generated and output using the reliability of the outputs of the two map information recovery units. E8-VSB receiving system. The method of claim 1, wherein the map information recovery unit E8-VSB receiving system, characterized in that for receiving the input and output signals of the equalizer in synchronization with the frame recovery, E8-VSB map information decoding, and VSB symbol attribute information. The method of claim 1, wherein the map information recovery unit A frame recovery unit for performing a frame recovery from the data symbols output from the demodulation unit and detecting a field synchronization signal indicating a field synchronization signal and an even field or an odd field; A map information extracting unit extracting E8-VSB map information inserted into and transmitted from a field synchronizing signal from a data symbol output from the demodulator using the field synchronizing signal; A Kerdock decoder for decoding the extracted E8-VSB map information with a Kerdock decoding algorithm; A current map determination unit for determining E8-VSB map information of a current field from the Kerdock-decoded E8-VSB map information by the field synchronization signal and the field division signal; And a symbol attribute information generation unit for generating VSB symbol attribute information indicating the attribute of each symbol of the E8-VSB signal by the E8-VSB map information of the current field and the field synchronization signal. E8-VSB Receive System. The method of claim 6, wherein the symbol attribute information generation unit Receiving the E8-VSB map information of the current field output from the current map determination unit and the field synchronization signal output from the frame recovery unit, and generating and outputting a 188-byte TP packet including only attribute information of the E8-VSB symbol Mux packet processing section, An ATSC RS encoder which adds 20 bytes having an attribute of a general 8VSB symbol to the 188 byte TP packet and outputs a 208 byte TP packet; An ATSC data interleaver for interleaving the TP packets of 208 bytes and outputting them in units of bytes; And a byte-symbol converter for converting the interleaved byte unit data into a symbol unit bit and outputting the symbol information as VSB symbol attribute information. The method of claim 7, wherein And the VSB symbol attribute information of each bit unit is input to the E8-VSB channel decoder / demultiplexer in synchronization with the E8-VSB symbol equalized by the equalizer. The method of claim 7, wherein The control packet output from the mux packet processing unit includes attribute information in units of VSB bytes, and the symbol attribute information is information for distinguishing whether each byte is general 8VSB data, first enhanced data, or second enhanced data. E8-VSB receiving system comprising a. The method of claim 7, wherein the mux packet processing unit 164 having only attribute information on whether the first enhanced data or the 1/4 enhanced data is based on the distribution type and the ratio of the first and second enhanced data packets of the current field in the E8-VSB map information of the current field. An enhanced packet generator for generating a control packet in bytes, A null enhanced RS encoder which extends 20 bytes by copying an attribute of each packet to an enhanced data control packet having only attribute information of the enhanced data output from the enhanced packet generator; An enhanced data interleaver for performing enhanced data interleaving on data output from the null enhanced RS encoder; A null bit extension unit for inserting and extending a null bit in accordance with first and second enhanced data with respect to the byte interleaved and output from the enhanced data interleaver; A null MPEG header inserter for inserting a byte of a general 8VSB attribute corresponding to a 4-byte MPEG header before every 184 bytes output from the null bit extension; And an E8-VSB packet multiplexer for multiplexing and outputting a general 8VSB segment and an enhanced VSB segment output from the null MPEG header inserter on a VSB segment basis using the map information of the current field and a field synchronization signal. E8-VSB receiving system. The method of claim 10, wherein the null bit extension portion When one byte of the first enhanced data is input, a predetermined null bit is inserted between each bit to expand it by 1/2 code rate.When one byte of the second enhanced data is input, each bit is repeated twice and each bit is repeated. E8-VSB receiving system, characterized in that the expansion to 1/4 code rate by inserting a predetermined null bit between each interval. The method of claim 10, And an MPEG header value inserted by the null MPEG header inserter is a value indicating that it is a general 8VSB byte. The method of claim 10, wherein the E8-VSB packet multiplexer The entire enhanced data stream is obtained by obtaining the number H of the first enhanced data stream and the number Q of the second enhanced data stream from the E8-VSB map information based on the field synchronization signal output from the map information recovery unit. The number of data segments (P) assigned to one VSB field is obtained (P = H + 2Q), and the general 8VSB segment and the enhanced VSB segment are distributed and multiplexed by selecting a distribution method included in the E8-VSB map information. E8-VSB receiving system, characterized in that. The method of claim 1, wherein the equalizing unit Compensating for the channel distortion included in the VSB demodulated signal by receiving the E8-VSB symbol attribute information of the current field provided by the map information recovery unit and the symbol determination value provided by the E8-VSB channel decoder / demultiplexer. E8-VSB receiving system characterized by. The method of claim 1, wherein the E8-VSB channel decoder / demultiplexer Viterbi decoding, 12-way deinterleaving, ATSC data byte deinterleaving, ATSC RS decoding, and ATRC data derandomization are sequentially performed on the E8-VSB symbols equalized by the equalizer according to the VSB symbol attribute information. A main data decoder which decodes only general 8VSB data; ATSC parity removal, ATSC data derandomization, null bit removal, enhanced data deinterleaving, enhanced RS decoding, and enhanced stream for the E8-VSB data deinterleaved by the main data decoder and output in packet units E8-VSB receiving system comprising an enhanced data decoder for decoding and separating the first and second enhanced data by sequentially performing demultiplexing. 16. The apparatus of claim 15, wherein the enhanced data decoding unit An ATSC parity removal unit which removes an ATSC RS parity portion from the packet data of a byte unit output by being deinterleaved by ATSC bytes in the main data decoder; An ATSC data derandomizer for performing an ATSC data derandomizer on data from which the ATSC RS parity portion has been removed; A mux packet processing unit which receives the E8-VSB map information of the current field and the field synchronization signal and generates and outputs a control packet including only attribute information of symbols for each byte; By using each VSB byte attribute information of the MUX packet processing unit, for each byte of data output from the ASTC data derandomizer, each byte is a general 8VSB data byte, a first enhanced data byte, or a second enhanced data. A null bit removing unit for recognizing a byte and reconstructing all bits of a general 8VSB data byte and meaningless bits of an enhanced data byte into a meaningful first and second enhanced byte; An enhanced data deinterleaver for performing enhanced deinterleaving on the byte-enhanced enhanced data composed of meaningful bits output from the null bit removing unit; An enhanced RS decoder for performing enhanced RS decoding on the enhanced deinterleaved data; An enhanced stream that separates the enhanced RS decoded data into a first enhanced data stream and a second enhanced data stream by using the E8-VSB map information and the field synchronization signal output from the map information recovery unit. E8-VSB receiving system, characterized in that consisting of multiplexing. Multiplexing of E8-VSB Map Information Inserted into the Unused Region of the Field Synchronization Signal by the E8-VSB Transmission System Inserting First Enhanced Data Encoded at 1/2 Code Rate and Second Enhanced Data Encoded at 1/4 Code Rate According to a rule, the packet is multiplexed in units of packets and converted into a format of an MPEG transport packet, and the format-converted enhanced data and main data are segmented according to a multiplexing rule of E8-VSB map information inserted in an unused region of the field sync signal. In the E8-VSB data demultiplexing method of the E8-VSB receiving system for receiving and demultiplexing the E8-VSB signal multiplexed in units, (a) performing frame recovery from the received and demodulated E8-VSB data to detect a field synchronization signal indicating a field synchronization signal in the frame and an even field or an odd field; (b) Extracting the E8-VSB map information of the current field inserted and transmitted in the unused area of the field sync signal by using the field sync signal and the field discrimination signal detected in step (a), and generating each VSB symbol attribute information. Making; (c) receiving each VSB symbol attribute information to compensate for channel distortion included in the VSB demodulated signal; And (d) receiving VSB symbol attribute information in synchronization with the E8-VSB symbol equalized in step (c) and using the E8-VSB map information, VSB symbol attribute information, and field synchronization signal to generate a general signal from the equalized signal. And decoding the 8VSB data and the first and second enhanced VSB data, respectively. 10. A method of demultiplexing E8-VSB data in an E8-VSB receiving system. The method of claim 17, The E8-VSB map information is Kerdock coded and inserted into an unused area of the field sync signal, and the number of packets of the first and second enhanced data transmitted in one field is determined, and the determined first and the first 2. E8-VSB data demultiplexing method of an E8-VSB receiving system, comprising information about multiplexing rules of enhanced data and multiplexing rules of enhanced data and main data. 18. The method of claim 17, wherein step (b) (b-1) extracting E8-VSB map information inserted into and transmitted from a field synchronization signal from the demodulated E8-VSB data symbol by using the field synchronization signal; (b-2) decoding the extracted E8-VSB map information with a Kerdock decoding algorithm; (b-3) determining E8-VSB map information of a current field from the Kerdock-decoded E8-VSB map information by the field synchronization signal and the field division signal; and (b-4) generating VSB symbol attribute information indicating the attribute of each symbol of the E8-VSB signal by the E8-VSB map information of the current field and the field synchronization signal. E8-VSB data demultiplexing method of the E8-VSB receiving system. The method of claim 19, wherein step (b-4) Generating and outputting a control packet in units of 188 bytes including only attribute information of E8-VSB bytes in units of VSB bytes using the E8-VSB map information of the current field and the field synchronization signal output in step (b-3). Steps, Adding 20 bytes having an attribute of a general 8VSB symbol to the 188 byte control packet and outputting the control packet of 208 bytes; Interleaving the 208 byte control packet with an ATSC data byte and outputting the byte by byte unit; And converting the interleaved data in byte units into data in symbol units and outputting the data as symbol symbol information of the E8-VSB. 21. The method of claim 20, wherein generating the control packet 164 having only attribute information on whether the first enhanced data or the 1/4 enhanced data is based on the distribution type and the ratio of the first and second enhanced data packets of the current field in the E8-VSB map information of the current field. Generating an enhanced data control packet in bytes, Copying an attribute of each packet to an enhanced data control packet having only attribute information of the enhanced data and extending 20 bytes; Performing enhanced data interleaving on the data output with the parity extended in the step; Inserting and extending a null bit in accordance with the first and second enhanced data for the byte interleaved and output in the step; Inserting a 4-byte MPEG header value indicating that the null bit is a normal 8VSB byte for every 184 bytes outputted with the null bit; Multiplexing and outputting a general 8VSB segment and an enhanced VSB segment in which the null MPEG header is inserted and output in units of VSB segments by using the map information of the current field and the field synchronization signal. E8-VSB data demultiplexing method of the system. 22. The method of claim 21, wherein the null bit expansion step is When one byte of the first enhanced data is input, a predetermined null bit is inserted between each bit to expand it by 1/2 code rate.When one byte of the second enhanced data is input, each bit is repeated twice and each bit is repeated. An E8-VSB data demultiplexing method of an E8-VSB receiving system, characterized by extending the data rate by 1/4 by inserting a predetermined null bit in between. The method of claim 21, wherein the E8-VSB packet multiplexing step The entire enhanced data stream is allocated to one field of VSB by obtaining the number H of the first and second enhanced data streams from the E8-VSB map information based on the field synchronization signal. E8- characterized in that the number of data segments (P) is obtained (P = H + 2Q), and the general 8VSB segment and the enhanced VSB segment are distributed and multiplexed by selecting a distribution method included in the E8-VSB map information. E8-VSB data demultiplexing method of VSB receiving system. 18. The method of claim 17, wherein step (d) (d-1) Viterbi decoding, 12-way deinterleaving, ATSC data byte deinterleaving, ATSC RS decoding, and ATRC data derandomizing sequentially for the equalized E8-VSB symbols according to the VSB symbol attribute information Decoding only general 8VSB data by performing (d-2) ATSC parity removal, ATSC data derandomization, null bit removal, enhanced data deinterleaving, enhancement for the E8-VSB data deinterleaved and output in the unit of packet in step (d-1) Decoding and separating the first and second enhanced data by sequentially performing de-RS decoding and enhanced stream demultiplexing, wherein the E8-VSB data demultiplexing method of the E8-VSB receiving system. The method of claim 24, wherein step (d-2) Removing the ATSC RS parity portion from the packet data of the byte unit which is deinterleaved and output in the step (d-1); Performing an ATSC data derandomizer on data from which the ATSC RS parity portion has been removed; Generating and outputting a control packet including only attribute information of a VSB symbol for each byte by receiving the E8-VSB map information and the field synchronization signal of the current field; By using the VSB byte attribute information, discriminate whether the ASTC data is derandomized and outputted in units of bytes, whether it is a general 8VSB data byte, a first enhanced data byte, or a second enhanced data byte for each byte. And reconstructing all bits of the normal 8VSB data byte and meaningless bits of the enhanced data byte into meaningful first and second enhanced bytes, Performing enhanced RS decoding after performing enhanced deinterleaving on the enhanced data consisting of meaningful bits in the step; Receiving the enhanced RS decoded data into a first enhanced data stream and a second enhanced data stream by using the E8-VSB map information and a field synchronization signal, and outputting the separated E8-VSB. E8-VSB data demultiplexing method of the system.