MX2008005202A

MX2008005202A - Digital broadcasting system and method

Info

Publication number: MX2008005202A
Application number: MXMX/A/2008/005202A
Authority: MX
Inventors: Ji Kumran; Chang Yongdeok; Kim Joonsoo; Jeong Haejoo; Park Euijun; Jeong Jinhee; Kim Jonghun; Kwon Yongsik; Yu Jungpil
Original assignee: Samsung Electronics Co Ltd
Priority date: 2005-10-21
Filing date: 2008-04-18
Publication date: 2008-10-03

Abstract

A digital broadcasting system and method, where the digital broadcasting system includes:a transmission stream generator multiplexing a normal stream and a turbo stream to generate a dual transmission stream;a transmitter inserting an supplementary reference signal (SRS) into the dual transmission stream, processing the turbo stream to reconstitute the dual transmission stream, and outputting the reconstituted dual transmission stream;and a receiver receiving the reconstituted dual transmission stream, separately turbo decoding the turbo stream, inserting the turbo decode turbo stream into the dual transmission stream, and decoding the dual transmission stream into which the turbo decoded turbo stream has been inserted, to restore normal stream data and turbo stream data. Thus, reception sensitivity of a digital broadcasting signal can be efficiently improved.

Description

SYSTEM AND DIGITAL EMISSION METHOD Technical Field The aspects of the present invention relate to a system and method of digital emission using a dual transmission current that includes a normal current and a turbo current for digital emission. More particularly, aspects of the present invention relate to a digital broadcasting system and method for improving a digital broadcast performance by generating, transmitting and receiving a dual transmission stream that includes a normal stream and / or a turbo current subjected to robust processing in order to improve reception performance of the ATSC VSB system which is a terrestrial DTV system in the United States of America (US A).

Previous Technique A Residual Sideband format of the Advanced Television Systems Committee (ATSC VSB), which is a digital terrestrial television (DTV) system of the United States of America, is a single carrier method and uses field synchronizations each of the which has 312 segments. Therefore, the reception performance is low in a poor channel, in particular in a Doppler attenuation channel. Figure 1 is a block diagram of a digital broadcast transmission and reception system according to the standards of a Digital Television system of the Advanced Television Systems Committee (ATSC DTV) as a digital broadcast system terrestrial general of the United States of North America. The digital broadcast transmitter of the digital broadcast transmission and reception system shown in Figure 1 is an improved Residual Lateral Band (EVSB) system suggested by PHILIPS. The systems form and transmit a dual stream that includes normal data from a standard ATSC VSB system to which robust data is added. Referring to Figure 1, the digital broadcast transmitter includes a scrambler 1 1, a Reed-Solomon (RS) 12 encoder, an interleaver 13, and a gate coder 14 to execute error correction coding (ECC) in the dual current. Randomizer 1 randomizes the dual current. The RS 12 encoder is a concatenated encoder that adds parity bytes to a transmission stream to correct an error that occurs in a transmission process due to channel characteristics. The interleaver 13 inserts the encoded RS data according to a predetermined pattern. The grid encoder 14 performs grid coding of the interleaved data in a range of 2/3 to map the interleaved data as level 8 symbols. The digital broadcast transmitter further includes a multiplexer 15 and a modulator 16. The multiplexer 15 inserts field synchronizations and field synchronizations within the data in which ECC has been executed as in a data format shown in Figure 2. Modulator 16 adds a predetermined direct current (DC) value to the data symbols within from which segment synchronization signals and field synchronization signals have been inserted. This inserts pilot tones and forms pulses to execute a VSB modulation on the data symbols and performs the frequency rise conversion of the data symbols into a signal on a radio frequency (RF) channel band. Therefore, in the digital broadcast transmitter, the normal data and the robust data are multiplexed and entered into the 1 1 scrambler using a method of transmitting dual current of normal data and robust data through a channel. The input data is randomized by the scrambler 1 1, coded externally by the encoder RS 12 as an external encoder, and interspersed by the interleaver 13. Likewise, the interleaved data is subjected to internal coding by means of the gate coder 14 in the unit of 12 symbols and are mapped as level 8 symbols., field synchronization signals and segment synchronization signals are inserted into the level 8 symbols. Pilot tones are inserted into the level 8 symbols to effect a VSB modulation in the level 8 symbols, perform the conversion of Frequency elevation of the level 8 symbols within an RF signal, and transmit the RF signal. The digital broadcast receiver of the digital broadcast transmission and reception system shown in Figure 1 includes a selector (not shown), a demodulator 21, an equalizer 22, a Viterbi decoder 23, a deinterleaver 24, an RS 25 decoder, and a descrambler 26. The selector converts the received RF signal through a channel into a baseband signal. The demodulator 21 detects the synchronization signals from the baseband signal and demodulates the baseband signal. Equalizer 22 compensates for a channel distortion of the demodulated signal caused by a multi-path. The Viterbi decoder 23 executes ECC in the equalized signal and demodulates the signal equalized in symbol data. The deinterleaver 24 rearranges the data interspersed by the interposer 13 of the digital transmission transmitter. The RS 25 decoder performs an error correction in the rearranged data. The descrambler 26 descrambles the data with the error corrected by the RS 25 decoder and outputs a transmission current Moving Picture Experts Group-2 (MPEG-2). Consequently, the digital broadcast receiver shown in Figure 1 executes a reverse process to a process executed by the digital broadcast transmitter. In other words, the emission receiver performs the frequency reduction conversion of the RF signal in the baseband signal, demodulates and equalizes the baseband signal, and executes the channel decoding of the demodulated and equalized signal in order to to restore an original signal. Figure 2 is a view illustrating a VSB data structure of a digital broadcast system (8-VSB) of the United States of America within which the segment synchronization signals and field synchronization signals are inserted. As shown in Figure 2, a structure includes two fields. One of the two fields includes a field synchronization segment as a first segment and 312 data segments. Also, in the VSB data structure, a segment corresponds to an MPEG-2 packet and includes a synchronization segment having 4 symbols and 828 data symbols. Referring to Figure 2, a segment synchronization signal as a synchronization signal and a field synchronization signal are used for synchronization and equalization in the digital broadcast receiver. Said in other words, a field synchronization signal and a segment synchronization signal are known between the digital broadcast transmitter and the digital broadcast receiver and used as reference signals for equalization in the digital broadcast receiver. In the terrestrial emission system of the United States of North America shown in figure 1, robust data is added to the normal data of an existing ATSC VSB system to form and transmit a dual current. Here, the existing normal data is transmitted along with the robust data.

Description of the Invention Technical Problem However, in the terrestrial digital broadcast system of the United States of North America shown in figure 1, although the dual current is transmitted with the addition of robust data, the reception performance of a multi-path channel is hardly improved in comparison of that of using a stream of normal data. In other words, the improvement of a normal current hardly contributes to the improvement of reception performance. Also, a turbo current can not contribute to the improvement of reception performance in a multi-path environment.

Technical solution Accordingly, the aspects of the present invention provide the digital broadcast system and method capable of improving the reception performance of a Residual Lateral Band method of the Advanced Television Systems Committee (ATSC VSB) as a terrestrial digital television (DTV) system. of the United States of America. According to one aspect of the present invention, a digital broadcast system is provided which includes: a transmission current generator multiplexes a normal current and a turbo current to generate a dual transmission current; a transmitter that inserts a complementary reference signal (SRS) into the dual transmission current, processes the turbo current to reconstitute the dual transmission current, and outputs the reconstituted dual transmission current; and a receiver that receives the reconstituted dual transmission current and decodes the current separately Normal and turbo current to restore normal current data and current turbo data. According to one aspect of the present invention, the transmission current generator includes: a Reed-Solomon (RS) encoder that receives the turbo current from an external source and performs the RS decoding of the current turbo; a duplicator forming a parity insertion area in the current turbo subject to RS coding; and a multiplexer that receives the normal current from an external source and multiplexes the turbo current processed by the duplicator and the normal current to generate the dual transmission current. In accordance with one aspect of the present invention, the duplicator converts each byte of the current turbo using a 1/2 range conversion method or a 1/4 range conversion method to form the parity insertion area between data bits of the current turbo. In accordance with one aspect of the present invention, the transmitter includes: a scrambler that receives the dual transmission current from the transmission current generator and randomizes the dual transmission current; an SRS inserter that inserts an SRS into a packaging area formed in the randomized dual transmission stream; an RS coder that encodes the dual transmission stream into which the SRS has been inserted; an interleaver that interlaces the coded RS dual transmission stream; a turbo processor that detects the turbo current from the interleaved dual transmission stream, which encodes the detected turbo current, packages the coded current turbo within the dual transmission current, and that offsets the parity that corresponds to the turbo current coded; and a grid and / or parity corrector that performs grid coding of the dual transmission stream processed by the turbo processor.

According to one aspect of the present invention, the turbo processor includes: a current turbo detector that detects the turbo current from the interleaved dual transmission stream; an external encoder that inserts the parity corresponding to the turbo current detected within the parity insertion area of the current turbo; an interleaver that intercalates the current turbo into which the parity has been inserted; a turbo-current packer that inserts the turbo current interspersed within the dual transmission current to reconstitute the dual transmission current; and a parity compensator that regenerates the parity of the reconstituted dual transmission current and adds the parity to the dual transmission current. In accordance with one aspect of the present invention, the turbo processor further includes: a byte-symbol converter that converts the interposed dual transmission stream of a byte unit into a symbol unit; and a symbol-byte converter that converts the dual transmission current by including the parity regenerated by the parity compensator from a symbol unit in a byte unit. In accordance with one aspect of the present invention, the transmitter further includes: a multiplexer that adds a synchronization signal to the dual transmission stream subject to grid coding; a pilot inserter that inserts a pilot into the dual transmission stream to which the synchronization signal has been added; a pre-equalizer that equalizes the dual transmission current into which the pilot has been inserted; a VSB modulator that performs VSB modulation of the equalized dual transmission stream; and a radio frequency (RF) modulator that modulates the modulated VSB dual transmission current within a signal in an RF channel band and transmits the signal. According to one aspect of the present invention, the grid and / or parity corrector executes an initialization before the coding of the SRS and compensates the parity according to a value changed by the initialization. In accordance with one aspect of the present invention, the grid and / or parity checker includes: a grid coding block that performs initialization and outputs pre-stored values as an initial value if an external control signal is received corresponds to a initialization section; an RS-coder that generates the parity corresponding to the initial value; an add-on that adds the parity generated by the RS-encoder to the dual transmission current to correct the parity of the dual transmission current; a multiplexer providing the dual transmission current that includes the parity corrected by the adder for the grid encoder block; and a map symbol that maps and outputs the dual transmission current submitted to grid coding by means of the grid encoder block. According to one aspect of the present invention, the grid coding block includes: a plurality of grid encoders; a separator that sequentially introduces the dual transmission current into the plurality of grid encoders; and an encoding output unit that sequentially detects values encoded by the plurality of grid encoders. According to one aspect of the present invention, each of the plurality of grid encoders includes: a first initialized memory and which outputs a pre-stored value as a first initial value if the external control signal is input; a second memory; and a third memory initialized to move a pre-stored value to the second memory in order to output the pre-stored value in the second memory as a second initial value if the external control signal is input, wherein the RS re-coder generates the parity that corresponds to an initial value that includes a combination of the first and second initial values. According to one aspect of the present invention, the receiver includes: demodulator that receives and demodulates the dual transmission current; an equalizer that equalizes the demodulated dual transmission current; a first processor that restores normal current data from the equalized dual transmission stream; and a second processor that restores turbo current data from the equalized dual transmission stream. According to one aspect of the present invention, the first processor includes: a Viterbi decoder which executes error correction in the normal current of the equalized dual transmission stream and decodes the normal current with error correction; a first deinterleaver that deinterleaves the dual transmission stream emitted from the Viterbi decoder; an RS decoder that performs the decoding of the deinterleaved dual transmission stream RS; and a first descrambler that descrambles the decoded RS dual transmission stream to restore normal current data. According to one aspect of the present invention, the second processor includes: a turbo decoder turbo decoding the turbo current of the equalized dual transmission stream; a second deinterleaver that deinterleaves the dual transmission stream that includes the turbo decoded turbo current; a parity eliminator that removes parity from the dual transmission stream deinterleaved by the second deinterleaver; a second scrambler that descrambles the dual transmission stream from which the parity has been removed; and a turbo demultiplexer that demultiplexes the descrambled dual transmission stream to restore current turbo data. In accordance with one aspect of the present invention, the turbo decoder includes: a grid decoder that executes grid decoding of the turbo current of the equalized dual transmission stream; an external deinterleaver that deinterleaves the current turbo subjected to grating decoding; an external map decoder decoding the deinterleaved current turbo; an external interleaver that interleaves the current turbo decoded by the external map decoder and provides the turbo current interleaved to the grid decoder if the external map decoder outputs a flexible decision output value; and a structure formatter that performs the structure formatting of a rigid decision output value issued from the external map decoder. In accordance with one aspect of the present invention, the turbo decoder further includes a symbol deinterleaver which converts the turbo current with formatting structure of a symbol unit into a byte unit and provides the turbo current to the turbo inserter. According to another aspect of the present invention, a digital emission method is provided which includes: multiplexing a normal current and a turbo current to generate a dual transmission current; insert an SRS into the dual transmission stream, process the turbo current to reconstitute the dual transmission current, and emit the reconstituted dual transmission current; and receive the reconstituted dual transmission current and decode the normal current and turbo current to restore normal current data and current turbo data. According to one aspect of the present invention, the multiplexing of the normal current and the turbo current to generate the dual transmission current includes: receiving the turbo current from an external source and effecting the RS coding of the turbo current; forming a parity insertion area in the current turbo subject to RS coding; and receiving the normal current from an external source and multiplexing the turbo current that includes the parity insertion area and the normal current to generate the dual transmission current.

In accordance with aspects of the present invention, each byte of the current turbo is converted using a 1/2 range conversion method or a 1/4 range conversion method to form the parity insertion area between data bits of the current turbo. According to one aspect of the present invention, the insertion of the SRS into the dual transmission stream, the processing of the turbo current to reconstitute the dual transmission current, and the emission of the reconstituted dual transmission current includes: randomization the dual transmission current generated; insert the SRS into a packaging area formed in the randomized dual transmission stream; encode the dual transmission stream into which the SRS has been inserted; interleaving the coded dual transmission stream; detecting the turbo current from the interleaved dual transmission current, encoding the turbo current, packing the coded current turbo within the dual transmission current, and compensating the parity corresponding to the coded current turbo; and perform grating coding of the dual turbo transmission stream processed. According to one aspect of the present invention, the detection of the turbo current from the interposed dual transmission stream, the coding of the turbo current, the packaging of the coded current turbo within the dual transmission current, and the compensation for The parity corresponding to the coded current turbo includes: detecting the turbo current from the interposed dual transmission current; insert the parity corresponding to the turbo current detected within the parity insertion area of the current turbo; intercalating the current turbo into which the parity has been inserted; Insert the turbo current interleaved into the dual transmission current to reconstitute the dual transmission current; and regenerate the parity of the reconstituted dual transmission stream and add the parity to the Dual transmission current. In accordance with one aspect of the present invention, the detection of the turbo current from the interposed dual transmission stream, the encoding of the turbo current, the packaging of the coded current turbo within the dual transmission stream, and the compensation of the parity corresponding to the coded current turbo further includes: converting the dual transmission current interspersed from a byte unit into a symbol unit; and converting the dual transmission stream including the regenerated parity of a symbol unit into a byte unit. According to one aspect of the present invention, the insertion of the SRS into the dual transmission stream, the processing of the turbo current to reconstitute the dual transmission current, and the emission of the reconstituted dual transmission current further include: adding a synchronization signal to the dual transmission stream subjected to grid coding; inserting a pilot into the dual transmission stream to which the synchronization signal has been added; equalize the dual transmission current into which the pilot has been inserted; effect the VSB modulation of the equalized dual transmission stream; and modulating the modulated VSB dual transmission current within a signal in an RF channel band and transmitting the signal. In accordance with one aspect of the present invention, an initialization is executed before the SRS is coded, and / or the parity is compensated according to a value changed by the initialization. According to one aspect of the present invention, the reception of the reconstituted dual transmission current and the decoding of the normal current and the turbo current to restore the normal current data and the turbo current data includes: receiving and demodulating the current dual transmission; equalize the current demodulated dual transmission; restore the normal current data from the equalized dual transmission stream; and restore turbo current data from the equalized dual transmission stream. According to one aspect of the present invention, the restoration of the normal current data from the equalized dual transmission stream includes: executing the error correction in the normal current of the equalized dual transmission current and decoding the normal current with error correction; deinterleaving the demodulated dual transmission stream; execute the decoding RS of the deinterleaved dual transmission stream; and descrambling the decoded dual RS stream stream to restore the normal current data. In accordance with one aspect of the present invention, the restoration of the turbo current data from the equalized dual transmission stream includes: turbo decoding the turbo current of the equalized dual transmission current; deinterleaving the dual transmission stream that includes the turbo decoded turbo current; remove parity from the deinterleaved dual transmission stream; descrambling the dual transmission stream from which the parity has been removed; and demultiplexing the descrambled dual transmission stream to restore the current turbo data.

In accordance with one aspect of the present invention, the turbo decoding of the turbo current of the equalized dual transmission stream includes: grid decoding the turbo current of the dual transmission current equalized using a grid decoder; de-interleaving the turbo current subjected to grating decoding; decode the de-interleaved current turbo; if a flexible decision output value is issued, interleaving the decoded current turbo and providing the turbo current interleaved to the grid decoder; if a rigid decision output value is issued, it performs the structure formatting of the rigid decision output value to emit the Dual transmission current. In accordance with one aspect of the present invention, the turbo decoding of the turbo current of the equalized dual transmission stream further includes converting the turbo current with formatting structure of a symbol unit to a byte unit.

Advantageous Effects As described above, in accordance with the aspects of the present invention, an emission service can be performed using a dual transmission current that includes a turbo current and a normal current. Therefore, the specific data can be processed robustly and transmitted. As a result, the issuing service can be provided efficiently. Also, an SRS can be inserted into the dual transmission stream so that a receiver can easily verify a channel's status. Therefore, a degree of compensation can be determined. In particular, the operations described above can be executed using a transmitter and the receiver having simple structures. As a result, the reception performance of an ATSC VSB format can be efficiently improved as a terrestrial DTV system in the United States of America.

Brief Description of the Drawings The above and other aspects and / or features of the present invention will be more apparent and will be appreciated more quickly by means of the description of certain embodiments of the present invention with reference to the accompanying drawings, in which: Figure 1 is a block diagram illustrating a configuration of a conventional digital transmission and reception system (ATSC VSB); Figure 2 is a view illustrating a conventional data frame structure of the Residual Lateral Band of the Advanced Television Systems Committee (ATSC VSB); Figure 3 is a block diagram illustrating a configuration of a digital broadcast system according to an embodiment of the present invention; Fig. 4 is a block diagram illustrating a configuration of a transmission current generator of the digital emission system shown in Fig. 3, according to an embodiment of the present invention; Figure 5 is a view illustrating a structure of a stream issued from an RS coder of the transmission current generator shown in Figure 3, according to an embodiment of the present invention; Fig. 6 illustrates a process for generating parity insertion areas using the transmission current generator shown in Fig. 4, according to an embodiment of the present invention; Figure 7 illustrates a process for generating parity insertion areas using the transmission current generator shown in Figure 4, according to an embodiment of the present invention; Fig. 8 is a block diagram illustrating a configuration of a transmitter of the digital broadcast system shown in Fig. 3, according to an embodiment of the present invention; Figure 9 is a block diagram illustrating a configuration of a turbo processor used in the transmitter shown in Figure 8, according to one embodiment of the present invention; Fig. 10 is a block diagram illustrating a configuration of a turbo processor used in the transmitter shown in Fig. 8, according to an embodiment of the present invention; Fig. 11 is a view illustrating an operation of an external interleaver used in a turbo processor according to an embodiment of the present invention; Fig. 12 is a block diagram illustrating a grid and / or parity corrector configuration used in the transmitter shown in Fig. 8, according to one embodiment of the present invention; Fig. 13 is a block diagram illustrating a configuration of a grid coder block used in the grid and / or parity corrector shown in Fig. 12, according to one embodiment of the present invention; Fig. 14 is a block diagram illustrating a configuration of a receiver of the digital broadcast system shown in Fig. 3, according to an embodiment of the present invention; Fig. 15 is a block diagram illustrating a configuration of a turbo decoder shown in Fig. 14, according to an embodiment of the present invention; Fig. 16 is a flow diagram illustrating a method for transmitting a dual transmission current according to an embodiment of the present invention; Fig. 17 is a flow chart illustrating a method for receiving a dual transmission strin accordance with an embodiment of the present invention; Fig. 18 is a flow chart illustrating a turbo decoding process according to an embodiment of the present invention; Y Fig. 19 is a view illustrating a structure of a dual transmission stream processed by a digital broadcast system according to an embodiment of the present invention.

Best Way to Carry Out the Invention Certain embodiments of the present invention will be described in more detail with reference to the accompanying drawings. In the following description, identical drawing reference numbers are used for similar elements even in different drawings. The themes defined in the description such as a detailed construction and elements are only those provided to aid a total understanding of the invention. Therefore, it is evident that the present invention can be carried out without those defined themes. Also, well-known functions or constructions will not be described in detail as they would confuse the invention with unnecessary details. Figure 3 is a block diagram illustrating a configuration of a digital broadcast system according to an embodiment of the present invention. The transmission current generator 100 receives and multiplexes a normal current and a turbo current to generate a dual transmission current. Fig. 4 is a block diagram illustrating a configuration of the transmission current generator 100 shown in Fig. 4, according to an embodiment of the present invention. Referring to Figure 4, the transmitting current generator 100 includes an RS 1 10 encoder, a duplicator 120, and a multiplexer 130. The RS 1 10 encoder receives the turbo current, adds the parity to the current turbo, encodes the turbo current, and transmits the coded current turbo to the duplicator 120. The multiplexer 130 multiplexes the normal current with the turbo current duplicated and coded for generating the dual transmit current received in the transmitter 200. FIG. 5 is a view illustrating a structure of a packet encoded by the RS 1 encoder 10 shown in FIG. 4. The RS 1 encoder 10 shown in FIG. 4 receives the turbo current that includes a synchronization signal area, a packet identity area (PID), and a turbo data area. The entire current turbo package shown has 188 bytes, although it may have other byte values. As shown, a synchronization signal is 1 byte, PID is 3 bytes, and the turbo data is 184 bytes. The RS 1 10 encoder removes the synchronization signal from the turbo current, calculates the parity of the turbo data area, and adds the parity of 20 bytes to the turbo current. As a result, a packet of the finally encoded turbo stream includes 207 bytes. Here, 3 bytes of 207 bytes are assigned to the PID, 184 bytes are assigned to the turbo data, and 20 bytes are assigned to the parity. However, it is understood that other byte values may be employed in other aspects, and that the packet may have elements and that the packet may have additional elements in place or in addition to the package elements shown. The duplicator 120 forms parity insertion areas in the coded current turbo. A method for forming the parity insertion area will now be described in detail. The bytes of the current turbo are divided into groups, each of which has 2 bytes or 4 bytes according to a pre-set expansion range. A portion of bit values of a byte and null data (eg, "0") is entered into each of the groups. The areas within which the null data is entered are the parity insertion areas. However, it is understood that with other ranges, the groups can be of other sizes. The operation of the duplicator 120 will now be described in more detail. By way of example, if an entry is increased to twice in a Vi range as shown in Figure 6 and "a, b, c, d, e, f, g, h" are inserted within a byte in order from the most significant bits (MSB), an output of the duplicator 120 is expressed as "a, a, b, b, c, c, d, d, e, e, f, f, g, g, h, h". In this example, a byte that includes MSBs "a, a, b, b, c, c, d, d," and a byte that includes bits "e, e, f, f, g, g, h, h" they are issued sequentially. In contrast, if an entry is increased four times in a range 1A as shown in Figure 7, an output of the duplicator 120 is expressed as "a, a, a, a, b, b, b, b, c, c, c, c, d, d, d, d, e, e, e, e, f, f, f, f, g, g, g, g, h, h, h, h ". In other words, 4 bytes are issued. Duplicator 120 does not necessarily need to duplicate the input bits, although it can insert a different arbitrary value (ie, null data) in other positions except designated positions. For example, if the duplicator 120 increments an entry up to two times, the duplicator 120 can emit "a, x, b, x, c, x ..." instead of "a, a, b, b, c, c , ... " Stated in other words, the duplicator 120 can maintain an original input value only in an anterior portion of each of the two consecutive bits, although it can place an arbitrary value within a back of each of the two consecutive bits. In another aspect of the invention, the duplicator 120 maintains an original value only in the back of the resulting output. If the duplicator 120 increases an output up to four times, an original input would be placed only within one of the first to the fourth positions, and an arbitrary value can be placed within the other expanded positions added by the duplicator 120 in another aspect of the invention. Figures 6 and 7 are views illustrating a method for forming parity insertion areas using the duplicator 120, in accordance with embodiments of the present invention. Figure 6 illustrates a 1/2 rank conversion method. The duplicator 120 adopts a 1/2 rank conversion method for each byte of a turbo current for generate two bytes. As shown in Figure 6, a byte including bits DO to D7 is divided into two bit groups. One of the two bit groups includes 4 bits DO to D3, and the other includes 4 bits D4 to D7. In said state, a null bit is placed with each bit of each of the two bit groups to expand each of the two bit groups for one byte. As a result, a first byte "D7 0 D6 0 D5 0 D4 0" is generated which includes bits D4 to D7 and a second byte "D3 0 D2 0 D1 0 DO 0" which includes DO to D3. A bit between two bits of each of the first and second bytes is used as a parity insertion area. Said in other words, the second, fourth, sixth, and zero bits of each of the first and second bytes are used as parity insertion areas. However, it is understood that the positions of said parity insertion areas can vary from those shown in Figure 6. By way of example, the second, third, sixth, and seventh bits or third, fourth, fifth, and sixth bits they can be employed as parity insertion areas in other aspects of the invention. Figure 7 illustrates a 1/4 range conversion method. Duplicator 120 adopts a 1/4 range conversion method for each byte of the current turbo to generate four bytes. Referring to Figure 7, a byte including bits DO through D7 is divided into four bit groups each of which has two bits DO and D1, D2 and D3, D4 and D5, or D6 and D7. In this state, three null bits are placed on a line next to each bit of each of the two bit groups in order to expand each of the four bit groups up to one byte. In detail, a byte is expanded to a first byte "D7 0 0 0 D6 0 0 0" that includes D6 and D7, a second byte "D5 0 0 0 D4 0 0 0" that includes D4 and D5, a third byte " D3 0 0 0 D2 0 0 0"that includes D2 and D3, and a quarter" D1 0 0 0 DO 0 0 0"that includes DO and D1. Referring to Figure 7, zero, first and second, and fourth, fifth and sixth bits of each of the four bit groups are used as parity insertion areas, although the parity insertion areas are not limited to this case and can be configured differently in the byte. Referring to Figure 4, the multiplexer 130 multiplexes the additionally received normal current and the turbo current processed by the duplicator 120. Therefore, a dual transmission current is generated which includes the normal current and the current turbo. While not required in all aspects, the normal current and the turbo current can be received from an external module such as an emitting apparatus or the like, and / or an internal module such as a compression processing module. (for example, a Moving Picture Experts Group-2 (MPEG-2) module, a video encoder, an audio encoder, or the like). The multiplexer 130 forms an adaptation field in each package of the dual transmission stream. The adaptation field is an area within which a current turbo or other data is to be inserted. In detail, in addition to a current turbo, restoration data for initialization, a complementary reference signal (SRS) or similar instruction sequence, and / or the like can be inserted within the adaptation field. The adaptation field can be used as an option field in which various types of package information are recorded. The packet information can be a program clock reference (PCR), an original program clock reference (OPCR), four circuit blocks, a splice countdown, a private transport data length, and / or a extension length of adaptation field. The PCR is used for a synchronization of a receiver demodulator. The OPCR is used to record, reserve and play a program on a receiver. The splice countdown is a number of consecutive macro-blocks each that includes Cr and Cb blocks. The length of private transport data is a length of alphabetic broadcast data. In this mode, an area in which a turbo current will be registered may not overlap with the option field.

The transmitter 200 shown in Figure 3 can be achieved as shown in Figure 8 according to one aspect of the invention. Referring to Figure 8, the transmitter 200 includes a scrambler 210, an SRS inserter 220, an RS 230 encoder, an interleaver 240, a turbo processor 250, a grid and / or parity checker 260, a synchronization signal multiplexer 270, a pilot inserter 280, a pre-equalizer 285, a residual sideband modulator (VSB) 290, and an RF modulator 295. The scrambler 210 scrambles the dual transmission current received from the transmission current generator 100. The SRS 220 inserter receives the dual transmission current and inserts the SRS into an adaptation field of each package of the dual transmission current. SRS refers to a commonly known signal pattern for a transmitter and a receiver. An emission receiver compares an SRS of a received current with an existing SRS to easily verify a state of a channel. Therefore, it is possible to determine a degree of compensation for parity using the SRS and / or the SRS 220 inserter. However, it is understood that the SRS does not need to be used in all aspects of the invention. The RS 230 encoder encodes the dual transmission current into which the SRS has been inserted. The interleaver 240 interleaves the coded dual transmission stream. The turbo processor 250 detects only the turbo current from the interleaved dual transmission stream, encodes and interleaves the detected turbo current, and robustly processes the coded and interleaved turbo current. The robustly processed current turbo is packaged within the dual transmission current to reconstitute the dual transmission current, which includes the normal current. Subsequently, a compensation operation is performed at the parity changed by the turbo current coding. Examples of the turbo processor 250 configuration are shown in Figures 9 and 10.

Referring to Figure 9, the turbo processor 250 includes a current turbo detector 251, an external encoder 252, an external interleaver 253, a turbocharger packer 254, and a parity compensator 255. The turbo current detector 251 detects the turbo current from the dual transmission current. The external encoder 252 adds the parity within the parity insertion area of the detected turbo current to encode the current turbo. The external interposer 253 intercalates the coded current turbo. The turbo packer 254 multiplexes the turbo current interleaved and the normal current to reconstitute the dual transmission current. The current turbo packer 254 can be achieved as a multiplexer, although it can be achieved in other ways in other aspects of the invention. The parity compensator 255 regenerates the parity of the reconstituted dual transmission current and adds the parity to the dual transmission current to compensate for a parity error caused by the coding of the turbo current. Fig. 10 is a block diagram illustrating a configuration of the turbo processor 250 according to another embodiment of the present invention. Referring to Figure 10, the turbo processor 250 further includes a byte-symbol converter 256 and a symbol-byte converter 257 in addition to a current turbo detector 251, an external encoder 252, an external interleaver 253, a turbocharger packer 254, and a parity compensator 255. The byte-symbol converter 256 converts the dual transmission current interspersed by the interleaver 240 from a byte unit to a symbol unit. The conversion of the byte unit to the symbol unit can be easily understood with reference to Table D5.2 of the US ATSC DTV Standards (A / 53), the contents of which are incorporated herein by reference in their whole. However, it is understood that other tables can be used byte to symbol with or without reference to US ATSC DTV standards. An example of the byte-to-symbol box in Table D5.2 is as follows: The turbo current detector 251 detects the turbo current from the dual transmission current which has been converted to the symbol unit. The external encoder 252 calculates the parity of the detected current turbo and inserts the parity into a parity insertion area to encode the current turbo. In this case, the external encoder 252 codes the current turbo in the byte unit. The external interposer 253 intersperses the coded current turbo. In this case, the external interposer 253 interleaves the turbo current coded in the one-bit unit. The turbo packer 254 multiplexes the turbo current interleaved and the normal current to reconstitute the dual transmission current. In detail, the turbo packer 254 packages the turbo current at an original position of the turbo current (i.e., for the position before the turbo current is detected by the current turbo detector 251), and constructs a current of dual transmission. The symbol-byte converter 257 converts the dual transmission current from a symbol unit to a byte unit. The conversion of the symbol unit to the byte unit can be easily understood by reference to Table D5.2 of "US ATSC DTV Standards (A / 53)" as previously established. Fig. 11 is a view illustrating an interleaving process performed by external interleaver 253 in accordance with an aspect of the invention. Referring to FIG. 11, the outer interleaver 253 executes the interleaving according to a predetermined interleaving rule. For example, the default collation rule shown is. { 0, 1, 2, 3.}. = > . { 2, 1, 3, 0.}. and "A, B, C, and D" are entered sequentially, "A, B, C, and D" are interleaved and emitted in the "DBAC." However, it is understood that other interleaving rules may be implemented. With reference to Figure 8, the processed dual turbo transmission current is subjected to grid coding by the grid and / or parity checker 260. The corrector grid and / or parity 260 also corrects the parity changed by grid coding. Fig. 12 is a block diagram illustrating a grid and / or parity checker configuration 260 (Fig. 8) according to an embodiment of the present invention. Referring to Figure 12, the grid and / or parity checker 260 includes a grid coder block 410, a RS 420 re-coder, an addrer 430, a multiplexer 440 and a mapper 450. While not required in In all aspects, the multiplexer 440 has an operation mode (referred to as a common mode) in which the grid coding is executed, and an operation mode (referred to as a parity correction mode) in which an aggregate package by the adder 430 is subjected to grate coding. The operation modes of the multiplexer 440 depend on a control signal received from the RS 420 re-encoder. The gate encoder block 410 performs the grid coding of a packet received from the multiplexer 440. While not required at all Aspects, the grid coder block 410 executes the grid coding of the packet according to an external control signal and can be initialized immediately before the SRS data of the packet is submitted to grid coding. The RS 420 re-encoder regenerates the parity corresponding to the changed packet when the gate coder block 410 is initialized. The addor 430 adds the re-coded parity to the packet received from the turbo processor 250, and provides the addition result to the multiplexer 440. A non-limiting example of the method of addition will be described. A) The above is omitted ... 1010010101 1 100101010101 1 AAAAA ... The rest is omitted.

B) The above is omitted ... 000000000000010000000000BBBBB ... The rest is omitted.

C) The above is omitted ... 1010010101 1 101 101010101 1 CCCCC. The rest is omitted.

A) indicates a packet received from the turbo processor 250, B) indicates a re-coded RS packet, and C) indicates a packet obtained by executing the exclusive OR in the received packet and the received packet and the re-coded RS packet using the additive 430. When an underlined part of the packet received from A) is input to the gate coder block 410, the gate coder block 410 is initialized. In this case, a value corresponding to a value pre-stored in the block grid encoder 410 is provided to the RS 420 re-encoder, and the RS 420 re-encoder adds parity to the value provided to issue the re-encoded RS packet of B). An underlined part of the re-encoded RS packet of B) represents a changed value corresponding to the underlined part of the packet received from A). The parity corresponding to the underlined part of the re-encoded RS packet of B) is regenerated as "BBBBB". Adder 430 executes the exclusive OR in the received packet of A) and the re-encoded RS packet of B) to issue the packet of C). Whereas the package of C), the underlined part of the package received from A) is changed to "01" in the package of C), and the package of the package received from A) is changed from "AAAAA" to "CCCCC" in the package of C). When the initialization and parity correction are completed, the multiplexer 440 operates in a general operation mode to provide the dual transmission current for the gate coder block 410. The mapper 450 maps the packet subjected to grid coding into symbols of level 8 and emit level 8 symbols. By way of example, map 450 may map the submitted grid coding package as shown in Table 1 below.

Table 1 As shown in Table 1 above, ZO, Z1, and Z2 are grid coding values emitted from the grid coding block 410. R are mapping output values that correspond to the grid coding values. In other words, if the grid coding values are issued as "0, 0, 0," map 450 outputs "-7" as a mapping output value. Figure 13 is a block diagram illustrating a configuration of the gate coder block 410 according to one embodiment of the present invention. Referring to Figure 13, the grid coding block 410 includes a separator 41 1, a plurality of grid encoders 412-1 to 412-12, and an encoding output unit 413. The separator 41 1 emits sequentially currents from the multiplexer 440 for the plurality of grid encoders 412-1 to 412-12. In this example, the currents can be emitted in the byte unit, although they can be emitted in another way. The grid encoders 412-1 to 412-12 carry out grid coding and emit the currents. In this case, the grid encoders 412-1 to 412-12 are selected sequentially to emit grid coding values of the encoders of gate 412-1 to 412-12. During an initial section, the grid coders 412-1 to 412-12 provide pre-stored values in memories (not shown) of the grid coders 412-1 to 412-12 as initial values to the RS 420 re-coder. The RS 420 re-encoder adds parity to the initial values provided and outputs the addition result to the additive 430 to correct the parity. The coding output unit 413 sequentially detects the grid coding values emitted from the grid coders 412-1 to 412-12 and outputs the grid coding values to the mapper 450. Each of the gate coders 412 -1 to 412-12 includes a plurality of memories and executes grating coding using the memories. In this case, the initialization is executed immediately before an area inserted with an SRS that is submitted to grid coding. The memories are restored by initialization. In this process, the values stored in the memories are provided as initial values to the RS 420 re-encoder. In detail and while not required in all aspects, each of the grid encoders 412-1 to 412-12 can include three memories : first to third memories. When the initialization is executed, the first memory issues a pre-stored value as an initial value (referred to as a first initial value). Also, the third memory is initialized and simultaneously shifts a pre-stored value to the second memory. A value (referred to as a second initial value) pre-stored in the second memory is issued as an initial value according to the offset operation. The RS 420 re-encoder combines the first and second values and uses the combined value as an initial value. The second and third memories are placed on a line to execute displacement operations. Therefore, two control signals are required to initialize the second and third memories. Also, 8 value states can be formed initial "000," "1 1 1," "001," "010," "100," "1 10," "101," "01 1" can be formed using the three memories. The "X0" and "X1" values indicating the first and second initial values can be provided to the RS 420 re-encoder to change the parity. Referring to FIG. 8, the synchronization multiplexer signal 270 adds a segment synchronization signal and a field synchronization signal to the dual transmission stream submitted to grid coding and multiplexes the dual transmission stream. The pilot inserter 280 adds a predetermined DC value to the dual transmission current for which the segment synchronization signal and the field synchronization signal have been added to insert a pilot into the dual transmission current. The pre-equalizer 285 equalizes the dual transmission current into which the pilot has been inserted to minimize inter-symbol interference (ISI). The VSB modulator 290 performs VSB modulation of the equalized dual transmission stream. The RF 295 modulator modulates the modulated VSB dual transmission current within a signal in an RF channel band and outputs the signal. Fig. 14 is a block diagram illustrating a configuration of the receiver 300 of the digital broadcast system shown in Fig. 3, according to an embodiment of the present invention. Referring to Figure 14, the receiver 300 includes a demodulator 310, an equalizer 320, a first processor 330, and a second processor 340. When the demodulator 310 receives the dual RF-modulated transmission current on, for example, an antenna , the demodulator 310 detects synchronization from the dual transmission stream in accordance with the synchronization signal added to the baseband signal of the dual transmission stream. The demodulator 310 demodulates the dual transmission current. Equalizer 320 equalizes the demodulated dual transmission current to compensate for a distortion of a channel caused by a multi-path of the channel. The dual transmission current equalized by the equalizer 320 is provided to the first and second processors 330 and 340. The first processor 330 processes the normal current of the dual transmission current to restore normal current data. Referring to Figure 14, the first processor 330 includes a Viterbi decoder 331, a first deinterleaver 332, an RS 333 decoder, and a first descrambler 334. The Viterbi decoder 331 executes the error correction in the normal current of the equalized dual transmission, decodes the symbols with error correction, and emits symbol packages. The first deinterleaver 332 deinterleaves the demodulated packets to rearrange the distributed packets. The RS 333 RS decoder decodes the deintercalated normal current packets to correct an error. The first descrambler 334 descrambles the decoded RS normal current packets to restore the normal current data. The second processor 340 processes the turbo current of the dual transmission current to restore the current turbo data. Referring to Figure 14, the second processor 340 includes a turbo decoder 510, a second deinterleaver 520, a parity eliminator 530, a second descrambler 540, and a turbo demultiplexer 550. The turbo decoder 510 turbo decodes only the current turbo the dual transmission current equalized. Turbo decoding is a process of decoding the current turbo. While not required, the turbo decoder 510 can detect the turbo current from a portion of the adaptation field of the dual transmission current or the entire adaptation field and then turbo decodes the current turbo. When the turbo decoder 510 turbo fully decodes the turbo current, the turbo decoder 510 inserts the turbo current into the dual transmission stream to reconstitute the dual transmission current.

The second deinterleaver 520 deinterleaves the reconstituted dual transmission current to rearrange the packets. The parity eliminator 530 removes the parity from the deinterleaved dual transmission stream. The second descrambler 540 descrambles the dual transmission stream from which the parity has been eliminated. The turbo demultiplexer 550 demultiplexes the descrambled dual transmission stream to restore the turbo data stream. Fig. 15 is a block diagram illustrating a configuration of the turbo decoder 510 (Fig. 14) according to an embodiment of the present invention. Referring to Figure 15, the turbo decoder 510 includes a grid decoder 51 1, an external deinterleaver 512, an external map decoder 513, an external interleaver 514, a structure formatter 515, and a symbol deinterleaver 516. grid decoder 51 performs grid decoding of the turbo current of the equalized dual transmission stream and transmits the turbo current subjected to grid decoding to the external deinterleaver 512. The external deinterleaver 512 deinterleaves the turbo current subjected to grid decoding. The external map decoder 513 performs the convolution decoding of the deinterleaved current turbo according to one aspect of the invention. The external map decoder 513 outputs flexible decision and flexible decision output values depending on the result of the convolution decoding. The flexible decision and rigid decision output values depend on an array of the current turbo. For example, if the current turbo matrix is "0.8," the flexible decision output value is issued as "0.8." If the current turbo matrix is "1", the rigid decision output value is output. The rigid decision output value of the external map decoder 513 is provided to the structure formatter 515. In this case, the rigid decision output value is the current turbo.

The structure formatter 515 formats the turbo rigid decision current subject to convolution decoding for a dual transmission stream structure to reconstitute the dual transmission stream. The symbol deinterleaver 516 can de-interleave the current turbo with structure formatting from a symbol unit for a byte unit. The deinterleaving from the symbol unit to the byte unit can be easily understood by reference to Table D5.2 of "US ATSC DTV Standards (A / 53)", and therefore its detailed description will be omitted. The symbol deinterleaver 516 is shown in FIG. 15, although it may be omitted in other embodiments. If the external map decoder 513 outputs the flexible decision output, the outer interleaver 514 interleaves the turbo current and provides the turbo current interleaved to the grid decoder 51 1. The grid decoder 51 1 performs grid decoding of the interleaved current turbo and provides the turbo current subjected to grid decoding to the external deinterleaver 512. The external deinterleaver 512 deinterleaves the turbo current subjected to grid decoding and provides the de-interleaved turbo current to the external map decoder 5 3. The operations of the grid decoder 51 1, the external deinterleaver 512, and the external interleaver 514 can be executed repeatedly until the rigid decision output value is output. Therefore, a reliable decoded value can be obtained. A digital emission method according to an embodiment of the present invention includes: generating a dual transmission current that includes a turbo current and a normal current; turbo decode and transmit only the turbo current of the dual transmission current; and receive the dual transmission current to decode separately the normal current and the turbo current to restore the normal current data and turbo current data. Figure 16 is a flow diagram illustrating a method for generating and transmitting a dual transmission stream in accordance with one embodiment of the present invention. Referring to Figure 16, in operation S610, a dual transmission current is generated. In detail, the parity insertion areas are formed in a turbo current, an adaptation field is formed in a normal current, and the turbo current and the normal current are multiplexed to generate the dual transmission current. In operation S620, the dual transmission current is randomized. In step S630, an SRS is inserted into a portion of the adaptation field. In step S640, the dual transmission stream into which the SRS is inserted is encoded. In operation S650, the coded dual transmission current is interleaved. In step S660, the turbo processing is carried out. The turbo processing generally means that only the turbo current is detected from the dual transmission stream, coded, interleaved, and inserted into the dual transmission stream. In this case, the operation S660 is executed after the operation S640. Therefore, a parity compensation operation is further executed in order to avoid variation with the turbo processing according to one aspect of the invention. In operation S670, grid coding and / or parity correction are executed. Subsequently, a synchronization signal is multiplexed, a pilot is inserted into the dual transmission current, and the dual transmission current is equalized, modulated and transmitted. The detailed description of this has been provided previously and will therefore be omitted. Figure 17 is a flow diagram illustrating a method for receiving a dual transmission stream in accordance with an embodiment of the present invention. Referring to FIG. 17, in operation S710, a signal is received and demodulated.

Dual transmission current. In the S720 operation, the demodulated dual transmission current is equalized. In operation S730, a normal current of the equalized dual transmission stream is subjected to Viterbi decoding. In the S735 operation, the normal current subjected to Viterbi decoding is deinterleaved. In operation S740, the de-interleaved normal current is subjected to RS decoding. In operation S745, the decoded normal RS current is descrambled to restore normal current data. In operation S750, only one turbo current of the equalized dual transmission current is subjected to turbo decoding. In step S755, the decoded turbo turbo current is deinterleaved. In the S760 operation, the parity is removed from the current turbo. In step S765, the turbo current is descrambled. In the S770 operation, the turbo current is detected from the descrambled dual transmission stream to demultiplex the turbo current in order to restore the current turbo data. Fig. 18 is a flow diagram illustrating a method of decoding a turbo current according to an aspect of the invention. Referring to Figure 18, in step S810, a turbo current of a dual transmission current is subjected to grid decoding. In step S 820, the turbo current subjected to grid decoding is externally de-interleaved. In step S830, the turbo current deintercalated externally is subjected to external decoding. If a rigid decision output value is issued through the external decoding, the turbo rigid decision stream is formatted for a dual transmission stream structure in the S850 operation. In operation S860, the current turbo is deinterleaved per symbol. If a flexible decision output value is issued through decoding external, operation S840 is executed to effect the external intercalation of the turbo current subjected to grid decoding. Operations S810 and 820 are again performed to execute grid decoding and external de-interleaving the turbo current interleaved externally. Thus, you can get a reliable rigid turbo current decision. Fig. 19 is a view illustrating a structure of a dual transmission stream processed by a digital broadcast system of one aspect of the present invention. Referring to Figure 19, 78 packages of turbo current are inserted into 312-segment packets of a field of dual transmission current. In the dual transmission stream, one packet (188 bytes) of turbo streams and three packets (188 bytes) of normal streams are repeated in a ratio of 1: 3. If 70 current turbo packs are inserted into 312 segments of the dual transmission stream, one packet of turbo currents and three packets of normal currents are repeated 70 times in a ratio of 1: 3, and 32 packets remain that are constituted as packets of normal current in the dual transmission current. An SRS that has a size of S byte is inserted inside each packet, and therefore a size of the current turbo is 182-S bytes. While not required, it is understood that aspects of the invention can be implemented using software, hardware, and combinations thereof. Insofar as it is described in terms of an emission signal sent through the air or cable, it is understood that transmission can be done through recording in a medium for delayed reproduction in other aspects of the invention. The above embodiment and the advantages are illustrative only and are not construed as limiting the present invention. Current teaching can be applied easily to other types of devices. Also, the description of the The embodiments of the present invention are intended to be illustrative, and not to limit the scope of the claims, and many alternatives, modifications, equivalents and / or variations will be apparent to those skilled in the art.

Industrial Applicability The present invention relates to a digital emission system and method using a dual transmission current that includes a normal current and a turbo current for digital emission.

Claims

CLAIMS 1 . A digital emission system characterized in that it comprises: a transmission current generator that multiplexes a normal current and a turbo current to generate a dual transmission current; a transmitter that inserts a complementary reference signal (SRS) into the dual transmission stream, processes the turbo current to reconstitute the dual transmission current, and emit the reconstituted dual transmission current; and a receiver receiving the reconstituted dual transmission current emitted and decoding separately the normal current and the turbo current to restore the normal current data and turbo current data.
2. The digital emission system according to claim 1, further characterized in that the transmission current generator comprises: a Reed-Solomon (RS) encoder that receives the turbo current from an external source and subject to RS coding the current turbo; a duplicator forming a parity insertion area in the current turbo subject to RS coding; and a multiplexer that receives the normal current from an external source and multiplexes the turbo current processed by the duplicator and the normal current to generate the dual transmission current.
3. The digital emission system according to claim 2, further characterized in that the duplicator converts each byte of the current turbo using a 1/2 range conversion method and / or a 1/4 range conversion method to form the area of parity insertion between data bits of the current turbo.
4. The digital emission system according to claim 1, further characterized in that the transmitter comprises; a scrambler receive the dual transmission current from the transmission current generator and randomize the dual transmission current; an SRS inserter that inserts the SRS into a packaging area in the randomized dual transmission stream; an RS coder that submits to RS coding the dual transmission stream into which the SRS has been inserted; an interleaver that interlaces the coded RS dual transmission stream; a turbo processor that detects the turbo current from the interleaved dual transmission stream, encode the detected turbo current, pack the coded current turbo within the dual transmission current, and compensate the corresponding parity for the coded current turbo; and a grid and / or parity corrector that performs grid coding of the dual transmission stream processed by the turbo processor.
5. The digital emission system according to claim 4, further characterized in that the turbo processor comprises: a current turbo detector that detects the turbo current from the interposed dual transmission current; an external encoder that inserts the parity corresponding to the turbo current detected within a parity insertion area of the current turbo; an external intercalator that intercalates the current turbo into which the parity has been inserted; a turbo-current packer that inserts the turbo current interspersed within the dual transmission current to reconstitute the dual transmission current; Y a parity compensator that regenerates the parity of the reconstituted dual transmission current and adds the parity to the dual transmission current.
6. The digital emission system according to claim 5, further characterized in that the turbo processor further comprises; a byte-symbol converter that converts the dual transmission current interspersed from a byte unit to a symbol unit; and a symbol-byte converter that converts the dual transmission current comprising the parity regenerated by the parity compensator of a symbol unit into a byte unit.
7. The digital emission system according to claim 4, further characterized in that the transmitter further comprises; a multiplexer that adds a synchronization signal to the dual transmission stream subjected to grid coding; a pilot inserter that inserts a pilot into the dual transmission stream to which the synchronization signal has been added; a pre-equalizer that equalizes the dual transmission current into which the pilot has been inserted; a VSB modulator that performs VSB modulation of the equalized dual transmission stream; and a radio frequency (RF) modulator that modulates the dual transmit current VSB modulated in a signal in an RF channel band and transmits the signal.
The digital emission system according to claim 4, further characterized in that the grid and / or parity corrector executes an initialization before the SRS coding and compensates the parity according to a value changed by the initialization.
9. The digital emission system according to claim 8, further characterized in that the grid and / or parity corrector comprises: a grid coding block that executes the initialization and outputs a pre-stored value as an initial value when a signal is received of external control corresponding to an initialization section; an RS-coder that generates the parity corresponding to the initial value; an adder that adds the parity generated by the RS coder to the dual transmission stream to correct the parity of the dual transmission current; a multiplexer providing the dual transmission current comprising the parity corrected by the add-on to the grid-encoding block; and a mapping symbol that maps and outputs the dual transmission current subject to grid coding by the grid coding block.
The digital emission system according to claim 9, further characterized in that the grid coding block comprises: a plurality of grid encoders; a separator that sequentially introduces the dual transmission current into the plurality of grid encoders; and an encoding output unit that detects values encoded by the plurality of grid encoders. eleven .
The digital emission system according to claim 10, further characterized in that each of the plurality of grid encoders comprises; a first memory initialized and issuing a pre-stored value as a first initial value when the external control signal is input; a second memory; Y a third memory initialized to move a pre-stored value to the second memory to output the pre-stored value in the second memory as a second initial value when the external control signal is input, wherein the RS-re-encoder generates the parity which corresponds to an initial value comprising a combination of the first and second initial values.
The digital broadcast system according to claim 1, further characterized in that the receiver comprises: a demodulator that receives and demodulates the transmitted dual broadcast current; an equalizer that equalizes the demodulated dual transmission current; a first processor that restores the normal current data from the equalized dual transmission stream; and a second processor that restores turbo current data from the equalized dual transmission stream.
13. The digital emission system according to claim 12, further characterized in that the first processor comprises: a Viterbi decoder that performs the error correction in the normal current of the equalized dual transmission stream and decodes the normal current with correction of error; a first deinterleaver that deinterleaves the dual transmission stream emitted from the Viterbi decoder; an RS decoder that performs the decoding of the deinterleaved dual transmission stream RS; and a first descrambler that descrambles the decoded dual transmission stream RS to restore the normal current data,
14. The digital emission system according to claim 12, further characterized in that the second processor comprises: a turbo decoder turbo decoding the turbo current of the equalized dual transmission stream; a second deinterleaver deinterleaving the dual transmission stream comprising the turbo decoded turbo current; a parity eliminator that removes parity from the dual transmission stream deinterleaved by the second deinterleaver; a second descrambler that descrambles the dual transmission current from which the parity has removed; and a turbo demultiplexer that demultiplexes the descrambled dual transmission stream to restore current turbo data.
15. The digital emission system according to claim 14, further characterized in that the turbo decoder comprises: a grid decoder that performs grid decoding of the turbo current of the equalized dual transmission stream; an external deinterleaver that deinterleaves the turbo current subjected to grating decoding to emit a flexible decision value and a rigid decision value; an external map decoder decoding the deinterleaved current turbo; an external interleaver that interleaves the current turbo decoded by the external map decoder and provides the turbo current interleaved to the grid decoder when the external map decoder outputs the flexible decision output value; and a structure formatter executing the structure formatting of the rigid decision output value issued from the external map decoder.
16. The digital emission system according to claim 15, further characterized in that the turbo decoder further comprises a symbol deinterleaver which converts the turbo current with formatting structure of a symbol unit into a byte unit and provides the turbo current to the turbo inserter
17. A digital emission method comprising: multiplexing a normal current and a turbo current to generate a dual transmission current; insert a complementary reference signal (SRS) into the generated dual transmission current, process the turbo current to reconstitute the dual transmission current, and emit the reconstituted dual transmission current; and receive the reconstituted dual transmission current and decode the normal current and the turbo current to restore the normal current data and turbo current data.
18. The method for digital emission according to claim 17, further characterized in that the multiplexing of the normal current and the turbo current to generate the dual transmission current comprises: receiving the turbo current from an external source and executing the Reed coding. Solomon (RS) the current turbo; forming a parity insertion area in the current turbo subject to RS coding; and receiving the normal current from an external source and multiplexing the turbo current comprising the parity insertion area and the normal current to generate the dual transmission current.
19. The digital emission method according to claim 18, further characterized in that each byte of the current turbo is converted using a 1/2 range conversion method and / or 1/4 range conversion method to form the parity insertion area between data bits of the current turbo.
The digital emission method according to claim 17, further characterized by the insertion of the SRS into the dual transmission stream, processing the turbo current to reconstitute the dual transmission current, and the emission of the transmission current reconstituted dual comprises: randomizing the generated dual transmission current; insert the SRS into a packaging area formed in the randomized dual transmission stream; encode the dual transmission stream into which the SRS has been inserted; interleaving the coded dual transmission stream; detecting the turbo current from the interleaved dual transmission stream, encoding the turbo current, packing the coded current turbo within the dual transmission current, and compensating the parity corresponding to the coded current turbo; and perform grating coding of the dual turbo transmission stream processed.
21. The digital emission method according to claim 20, further characterized by the detection of the turbo current from the interposed dual transmission stream, the encoding of the turbo current, the packaging of the coded current turbo within the dual transmission stream , and the parity compensation corresponding to the coded current turbo comprises: detecting the turbo current from the interposed dual transmission current; insert the parity corresponding to the turbo current detected within a parity insertion area of the current turbo; intercalating the current turbo into which the parity has been inserted; Insert the turbo current interleaved into the dual transmission current to reconstitute the dual transmission current; and regenerating the parity of the reconstituted dual transmission current and adding the parity to the dual transmission current.
22. The digital emission method according to claim 21, further characterized by the detection of the turbo current from the interposed dual transmission current, the encoding of the turbo current, the packaging of the coded current turbo within the current of dual transmission, and the parity compensation corresponding to the coded current turbo further comprises: converting the dual transmission current interspersed from a byte unit to a symbol unit; and converting the dual transmission current comprising the regenerated parity of a symbol unit into a byte unit.
23. The digital emission method according to claim 20, further characterized by the insertion of the SRS into the dual transmission stream, the processing of the turbo current to reconstitute the dual transmission current, and the emission of the current Reconstituted dual transmission systems further comprise: adding a synchronization signal to the dual transmission stream subjected to grid coding; inserting a pilot into the dual transmission stream to which the synchronization signal has been added; equalize the dual transmission current into which the pilot has been inserted; effect the VSB modulation of the equalized dual transmission stream; Y Modulate the modulated VSB dual transmission current within a signal in an RF channel band and transmit the signal.
24. The digital emission method according to claim 20, further characterized in that an initialization is executed before the SRS is coded and the parity is compensated according to a value changed by the initialization.
25. The digital emission method according to claim 17, further characterized by the reception of the reconstituted dual transmission current and the decoding of the normal current and the turbo current to restore the normal current data and the current turbo data comprise: receiving and demodulating the dual transmission stream; equalize the demodulated dual transmission stream; restore the normal current data from the equalized dual transmission stream; and restore turbo current data from the equalized dual transmission stream.
26. The digital emission method according to claim 25, further characterized in that the restoration of the normal current data from the equalized dual transmission stream comprises: executing the error correction of the normal current of the transmission current Dual equalized and decode the normal current with error correction; deinterleaving the demodulated dual transmission stream; performing the RS decoding of the deinterleaved dual transmission stream; and descrambling the decoded dual RS stream stream to restore the normal current data,
27. The digital emission method according to claim 25, further characterized in that the restoration of the turbo current data from the equalized dual transmission stream comprises: turbo decoding the turbo current of the equalized dual transmission current; deinterleaving the dual transmission stream comprising the turbo decoded turbo current; remove the parity from the deinterleaved dual transmission stream; descrambling the dual transmission stream from which the parity has been removed; and demultiplexing the descrambled dual transmission stream to restore the current turbo data.
28. The digital emission method according to claim 27, further characterized in that the turbo decoding of the turbo current of the equalized dual transmission stream comprises; execute grid decoding of the turbo current of the equalized dual transmission current using a grid decoder; de-interleaving the turbo current subjected to grating decoding; decoding the deinterleaved current turbo to output a flexible decision output value or a rigid decision output value; when the flexible decision output value is output, interleaving the decoded current turbo and providing the turbo current interleaved to the grid decoder; when the rigid decision output value is issued, execute the structure formatting of the rigid decision output value to emit the dual transmission stream.
29. The digital emission method according to claim 28, further characterized in that the turbo decoding of the turbo current of the equalized dual transmission stream further comprises converting the turbo current with formatting structure of a symbol unit into a byte unit.
30. The digital emission system according to claim 3, further characterized in that: the duplicator converts each byte of the current turbo using the 1/2 rank conversion method to form four pairs of bits within each byte, each pair it includes a parity insertion area and a corresponding bit of the current turbo, and for each pair, a parity insertion area is in a first bit position of the pair.
31 The digital emission system according to claim 3, further characterized in that: the duplicator converts each byte of the current turbo using the 1/2 rank conversion method to form four pairs of bits within each byte, each pair includes a parity insertion area and a corresponding bit of the current turbo, and for each pair, a parity insertion area is in a second bit position of the pair.
32. The digital emission system according to claim 3, further characterized in that: the duplicator converts each byte of the turbo current using the 1/4 range conversion method to form two groups of four bits within each byte, each The group includes a parity insertion area of three bits and a corresponding bit of the current turbo, and for each group, a parity insertion area is in the first to third positions of the group.
33. The digital emission system according to claim 3, further characterized by: the duplicator converts each byte of the current turbo using the 1/4 range conversion method to form two groups of four bits within each byte, each group includes a parity insertion area of three bits and one bit corresponding to the current turbo, and for each group, a parity insertion area is in the second to fourth bit positions of the group.
34. The digital emission system according to claim 4, further characterized in that the transmission current rator further comprises a multiplexer that multiplexes the normal and turbo currents, and forms the packaging area into which the SRS is inserted.
35. The digital emission system according to claim 34, further characterized in that: the packaging area comprises an adaptation field added by the multiplexer within each package of the dual transport stream, and one of the adaptation fields that does not include the packaging area comprising a selectable option field between and individually indicating a program clock reference (PCR), an original program clock reference (OPCR), four circuit blocks, a splice countdown , a length of transport private data, and / or an adaptation field extension length.
36. The digital emission system according to claim 2, further characterized in that the transmitter comprises; a scrambler that receives the dual transmission current from the transmission current rator and randomizes the dual transmission current; an SRS inserter that inserts the SRS into a packaging area in the randomized dual transmission stream; an encoder that submits to RS coding the dual transmission stream into which the SRS has been inserted; an interleaver that interlaces the coded RS dual transmission stream; a turbo processor that detects the turbo current from the interposed dual transmission stream, encode the detected turbo current, pack the coded current turbo within the dual transmission current, and compensate the parity that corresponds to the turbo current coded; and a grid and / or parity corrector that performs grid coding of the dual transmission stream processed by the turbo processor.
37. The digital emission system according to claim 36, further characterized in that the turbo processor comprises: a current turbo detector that detects the turbo current from the interposed dual transmission stream; an external encoder that inserts the parity corresponding to the turbo current detected within the parity insertion area of the turbo current created by the duplicator; an external intercalator that intercalates the current turbo into which the parity has been inserted; a turbo-current packer that inserts the turbo current interspersed within the dual transmission current to reconstitute the dual transmission current; and a parity compensator that rerates the parity of the reconstituted dual transmission current and adds the parity to the dual transmission current.
38. The digital emission system according to claim 2, further characterized by: prior to RS coding, the turbo current comprises a synchronization signal, a packet identity area and a turbo current area, and the RS encoder separates the synchronization signal from the received turbo current and inserts a parity into the turbo current while undergoing RS coding the turbo current to enlarge the current turbo.
39. The digital emission system according to claim 38, further characterized in that: before RS coding, the turbo current is 188 bytes including 1 byte for the synchronization signal, 3 bytes for the identity area of the packet, and 184 bytes for the current turbo area, and after the RS coding, the turbo current is 207 bytes which includes 20 bytes for parity, 3 bytes for the packet identity area, and 184 bytes for the area of current turbo.
40. A digital emission system comprising: a transmitter that inserts an instruction sequence into a dual transmission stream comprising a normal multipack current with a turbo current, processing the turbo current to reconstitute the dual transmission current, and emitting the reconstituted dual transmission current; and a receiver receiving the transmitted reconstituted dual transmission current, which compares the instruction sequence in the received dual transmission current with an instruction sequence stored in the receiver, and separately decodes the normal current and the current turbo to restore data of normal current and current turbo data.
41 The digital emission system according to claim 40, further characterized in that the instruction sequence comprises a complementary reference signal (SRS).
42. The digital emission system according to claim 40, further characterized in that the transmitter comprises: an instruction sequence inserter that inserts the instruction sequence into a packaging area in the dual transmission stream; a Reed-Solomon (RS) encoder that encodes the dual transmission stream into which the instruction sequence has been inserted; an interleaver that interleaves the dual transmission stream encoded by instruction sequence; a turbo processor that detects the turbo current from the interposed dual transmission stream, encode the detected turbo current, pack the coded current turbo within the dual transmission current, and compensate the parity that corresponds to the turbo current coded; and a grid and / or parity corrector that performs the coding of the dual transmission current processed by the turbo processor.
43. The digital broadcast system according to claim 42, further characterized in that the turbo processor comprises; a turbo current detector that detects the turbo current from the interposed dual transmission current; an external encoder that inserts the parity corresponding to the turbo current detected within a parity insertion area of the current turbo; an external intercalator that intercalates the current turbo into which the parity has been inserted; a turbo-current packer that inserts the turbo current interspersed within the dual transmission current to reconstitute the dual transmission current; Y a parity compensator that regenerates the parity of the reconstituted dual transmission current and adds the parity to the dual transmission current,
44. The digital emission system according to claim 42, further characterized in that: the packaging area comprises a aggregate adaptation field within each package of the dual transport stream while multiplexing the normal and turbo currents, and one of the adaptation fields that does not include the packaging area comprises an option field selected from and indicates individually a program clock reference (PCR), an original program clock reference (OPCR), four circuit blocks, a splice countdown, a transport private data length, and / or a field extension length of adaptation.
45. The digital emission system according to claim 42, further characterized in that the grid and / or parity corrector comprises: a grid coding block that executes an initialization and outputs a pre-stored value as an initial value when it is received an external control signal corresponding to an initialization section; an RS-coder that generates the parity corresponding to the initial value; an add-on that adds the parity generated by the RS-encoder to the dual transmission current to correct the parity of the dual transmission current; a multiplexer providing the dual transmission current comprising the parity corrected by the add-on to the grid-encoding block; and a mapping symbol that maps and outputs the dual transmission current subject to grid coding by the grid coding block.
46. The digital emission system according to claim 45, further characterized in that the grid coding block comprises: a plurality of grid coders; a separator that sequentially introduces the dual transmission current into the plurality of grid encoders; and an encoding output unit that sequentially detects values encoded by the plurality of grid encoders.
47. The digital emission system according to claim 46, further characterized in that each of the plurality of grid coders comprises; a first memory initialized and issuing a pre-stored value as a first initial value when the external control signal is input; a second memory; and a third memory initialized to shift a pre-stored value for the second memory in order to output the pre-stored value in the second memory as a second initial value when the external control signal is input, wherein the RS re-encoder generates the parity corresponding to an initial value comprising a combination of the first and second initial values.
48. A digital broadcast receiver characterized in that it receives a dual transmission current and separately decodes a normal current and a turbo current included in the dual transmission current to restore normal current and turbo current data.
49. The digital broadcast receiver according to claim 48, further characterized in that it comprises: a demodulator that receives and demodulates the dual transmission current; an equalizer that equalizes the demodulated dual transmission current; a first processor that restores the normal current data from the dual transmission current equalized; and a second processor that restores turbo current data from the equalized dual transmission stream.
50. The digital broadcast receiver according to claim 49, further characterized in that the first processor comprises: a Viterbi decoder that performs the error correction in the normal current of the equalized dual transmission current and decodes the normal current with correction of error; a first deinterleaver that deinterleaves the dual transmission stream emitted from the Viterbi decoder; an RS decoder executing the RS decoding of the deinterleaved dual transmission stream; and a first descrambler that descrambles the decoded RS dual transmission stream to restore normal current data.
51 The digital broadcast receiver according to claim 49, further characterized in that the second processor comprises: a turbo decoder that turbo decodes the turbo current of the equalized dual transmission stream; a second deinterleaver deinterleaving the dual transmission stream comprising the turbo decoded turbo current; a parity eliminator that removes parity from the dual transmission stream deinterleaved by the second deinterleaver; a second descrambler that descrambles the dual transmission stream from which the parity has been removed; and a turbo demultiplexer that demultiplexes the dual transmission current descrambled to restore turbo current data.
52. The digital broadcast receiver according to claim 51, further characterized in that the turbo decoder comprises; a grid decoder executes the grid decoding of the turbo current of the equalized dual transmission stream; an external deinterleaver that deinterleaves the turbo current subjected to grating decoding to emit a flexible decision value and a rigid decision value; an external map decoder decoding the deinterleaved current turbo; an external interleaver that interleaves the current turbo decoded by the external map decoder and provides the turbo current interleaved to the grid decoder when the external map decoder ous the flexible decision ou value; and a structure formatter that relays the structure formatting of the rigid decision ou value issued from the external map decoder.
53. The digital broadcast receiver according to claim 52, further characterized in that the turbo decoder further comprises a symbol deinterleaver that converts the turbo current with formatting structure of a symbol unit into a byte unit and provides the current turbo. to the turbo inserter.
54. A method for receiving digital emission to receive a dual transmission current and decode a normal current and a turbo current included in the transmission current separately to restore normal current and turbo current data.
55. The method for receiving digital broadcast in accordance with claim 54, further characterized in that it comprises: receiving and demodulating the dual transmission stream; equalize the demodulated dual transmission stream; restore the normal current data from the equalized dual transmission stream; and restore turbo current data from the equalized dual transmission stream.
56. The method for receiving digital emission according to claim 55, further characterized in that the restoration of the normal current data from the equalized dual transmission stream comprises: executing the error correction in the normal current of the Dual transmission equalized and decode the normal current with error correction; deinterleaving the demodulated dual transmission stream; performing the RS decoding of the deinterleaved dual transmission stream; and descrambling the decoded dual RS stream stream to restore the normal current data.
57. The method for receiving digital emission according to claim 55, further characterized in that the restoration of the turbo current data from the equalized dual transmission stream comprises: turbo decoding the turbo current of the equalized dual transmission current; deinterleaving the dual transmission stream comprising the turbo decoded turbo current; remove the parity from the deinterleaved dual transmission stream; descrambling the dual transmission stream from which the parity has been removed; Y demultiplex the descrambled dual transmission stream to restore turbo current data.
58. The method for receiving digital broadcasting according to claim 57, further characterized in that the turbo decoding of the turbo current of the equalized dual transmission stream comprises: performing the grid decoding of the turbo current of the equalized dual transmission stream using a grid decoder; de-interleaving the turbo current subjected to grating decoding; decoding the deinterleaved current turbo to output a flexible decision output value or a rigid decision output value; when the flexible decision output value is output, interleaving the decoded current turbo and providing the turbo current interleaved to the grid decoder; when the rigid decision output value is issued, it performs the structure formatting of the rigid decision output value to emit the dual transmission stream.
59. The method for receiving digital broadcasting according to claim 58, further characterized in that the turbo decoding of the turbo current of the equalized dual transmission stream further comprises converting the turbo current with formatting structure of a symbol unit into a unit byte