KR101535833B1 - Device for processing streams and method thereof - Google Patents

Abstract

A stream processing apparatus is disclosed. The present stream processing apparatus includes a stream rearranging section for stacking and rearranging streams, and a dummy insertion section for adding a dummy to a rearranged stream. In this case, the dummy may include an interleaving section for convolutionally interleaving the added stream, and may include an RS encoder and a CRC encoder. Accordingly, the digital broadcast service can be stably provided.

Stream rearrangement, dummy, convolutional interleaving, block interleaving

Description

[0001] The present invention relates to a device for processing streams,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stream processing apparatus and a method thereof, and more particularly, to a stream processing apparatus and a method thereof for interleaving a stream using a dummy.

Due to the development of electronic and communication technologies, various standards for digital broadcasting have been introduced in the field of broadcasting system by introducing digital technology. Specifically, there are the ATSC VSB standard, which is a standard for the United States, and the DVB-T standard, which is a European standard.

Among these, the ATSC VSB transmission method based on the US standard is based on the NTSC frequency band, and has merits in terms of ease of implementation of the transceiver and economical efficiency. This ATSC VSB transmission scheme uses a single carrier amplitude modulated residual sideband (VSB) to transmit high quality video, audio, and ancillary data in a single 6 MHz bandwidth.

Meanwhile, various digital broadcasting standards have been proposed to provide a more advanced digital broadcasting service.

As a result, there is a need for technology development for stream processing more efficiently and stably.

It is an object of the present invention to provide a stream processing apparatus capable of efficiently and stably processing a stream, a method thereof, and a digital broadcast receiver for receiving a stream processed thereby .

A stream processing apparatus according to an embodiment of the present invention includes a stream rearranging unit for stacking and rearranging streams and a dummy insertion unit for adding a dummy to the rearranged stream.

Here, the interleaving unit may be a convolutional interleaver.

In this case, the stream rearranging unit may stack the streams in a vertical direction in units of a predetermined number, and rotate the stacked units by a right angle to rearrange the streams.

Preferably, the stream rearrangement unit divides each of the per-unit streams into blocks of predetermined sizes, and performs the quadrature rotation on a block-by-block basis.

Also, preferably, the dummy insertion unit inserts a dummy corresponding to the memory size of the interleaving unit into the stream rotated in units of blocks.

The present stream processing apparatus may further include a dummy removing unit for removing the dummy from the stream output from the interleaving unit, and a burst generating unit for collecting the dummy-removed stream in units of bursts.

Meanwhile, according to another embodiment of the present invention, the stream rearranging unit may rearrange the streams in the vertical direction while arranging the streams in the horizontal direction by a predetermined first size unit.

In this case, the stream processing apparatus may further include an RS encoder section for adding RS parity to the longitudinal end portion of the stream, and a CRC encoder section for adding a CRC value to the transverse end portion of the stream to which the RS parity is added .

In addition, the dummy inserting unit may divide the stacked stream into transmission bursts of a predetermined second size unit, and add a dummy according to the transmission burst size for a stream in which one transmission burst is not performed.

Preferably, the stream input to the stream rearranging unit may be divided into units of packets to which parity is added.

Meanwhile, a stream processing method according to an embodiment of the present invention includes a stream rearranging step of stacking and rearranging streams, a dummy insertion step of adding a dummy to the rearranged stream, And an interleaving step of interleaving the added stream.

In this case, the interleaving step may use a convolutional interleaver.

In this case, the stream rearranging step may include stacking the streams in a vertical direction by a predetermined number of units, and rearranging the streams by right-angled rotation of stacked unit-by-unit streams.

Preferably, the step of rearranging the streams by rotating the stacked unit-by-unit streams by a right angle comprises: dividing each of the streams into unit blocks into blocks of a predetermined size, and performing the rectangular rotation in units of blocks .

In the dummy embedding step, a dummy corresponding to the memory size of the convolutional interleaver may be inserted into the stream rotated by the block unit.

More preferably, the present stream processing method may further comprise removing the dummy from the interleaved stream and collecting the stream from which the dummy has been removed, in bursts.

According to another embodiment of the present invention, the stream rearranging step rearranges the streams in the vertical direction while arranging the streams in a horizontal direction by a predetermined first size unit.

The present stream processing method further includes an RS encoding step of adding RS parity to the longitudinal end of the stream and a CRC encoding step of adding a CRC value to the horizontal end of the stream to which the RS parity is added .

Meanwhile, in the dummy embedding step, the stacked stream may be divided into a transmission burst of a predetermined second size unit, and a dummy may be added to a stream that does not include one transmission burst, according to the transmission burst size.

Preferably, the stream rearranging step rearranges the streams separated in units of packets added with parity.

According to another aspect of the present invention, there is provided a digital broadcasting receiver including a tuner for receiving a stream, a demodulator for demodulating the received stream, an equalizer for equalizing the demodulated stream, Interleaver section. Here, the streams may be stacked and rearranged in a predetermined unit on the digital broadcast transmitter side, and then dummies may be added and processed.

Advantageously, the stream is convolutionally interleaved on the digital broadcast transmitter side, and then the dummy is removed.

More preferably, the dummy removing unit removes the dummy added to the stream. In this case, the stream is block interleaved on the digital broadcasting transmitter side, and the dummy may be added.

By using the stream processing apparatus and method, and the digital broadcast receiver according to various embodiments as described above, stream transmission and reception can be efficiently and stably performed.

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

1 is a block diagram showing a configuration of a stream processing apparatus according to an embodiment of the present invention. 1, the present stream processing apparatus includes a stream rearranging section 110 and a dummy inserting section 120. As shown in FIG.

The stream reordering unit 110 stacks and rearranges an input stream. The rearrangement method may vary depending on the embodiment.

The dummy insertion unit 120 adds a dummy to the rearranged stream in the stream rearrangement unit 110. [ The dummy means data to be inserted so that the rearranged stream can be divided into predetermined processing units or transmission units. Any data that does not have any meaning as a dummy. For example, the dummy may be a preset bit value such as a 0 bit, or a predetermined byte value. Or, data with any meaning can be used as a dummy. For example, when there are various types of data to be transmitted additionally, for example, data such as an additional reference signal or channel additional information, the data may be used as a dummy.

The stream reordering unit 110 may stack the stream in a preset unit. For example, the stream rearranger 110 arranges one packet or a stream of segment units in the horizontal direction, arranges the next packet or segment stream in the next line, and stacks the packets in the vertical direction.

Meanwhile, an interleaving unit for interleaving may be added to the rear end of the dummy insertion unit 120 of FIG.

FIG. 2 is a schematic diagram showing an embodiment in which an interleaving unit is added to the configuration of FIG. 1 according to an embodiment of the present invention.

As shown in FIG. 2, an interleaving unit 130 implemented by a convolutional interleaver may be provided at a rear end of the dummy insertion unit 120. Specifically, the interleaving unit 130 may be implemented as a convolutional byte interleaver type for processing streams in units of bytes. In the convolutional interleaver of FIG. 2, the number of branches and the memory size may be set differently depending on the transmitter used.

When implemented as a convolutional byte interleaver, the interleaving unit 130 includes a plurality of shift registers having different lengths. That is, shift registers of the same size as M, 2M, (B-2) M and (B-1) M are sequentially arranged. The interleaving unit 130 sequentially selects each of the shift registers, thereby changing the interleaving interval.

Referring to FIG. 2, a stream input to the interleaving unit 130 is divided into byte units, sequentially stored in a plurality of shift registers, and then sequentially output. Thus, interleaving in units of bytes can be performed.

For example, if the input stream is divided into a plurality of fields and one field is composed of 312 segments or packets, the interleaving unit 130 may be implemented in a form that operates in units of 52 data segments or packets.

3 to 6 are schematic diagrams for explaining a stream processing process when the interleaver 130 is implemented as a convolutional interleaver.

Referring to FIG. 3, the stream rearranger 110 sequentially stacks streams in units of a predetermined number. For example, stacking can be performed in units of six packets. Each packet can be in the form of 188 bytes of data and 20 bytes of parity. The stream reordering unit 110 may rearrange the stream units stacked in the vertical direction by rotating them at right angles.

In this case, as shown in FIG. 3, the stream rearranger 110 may divide a plurality of stacked packets into a plurality of blocks. In this case, six packets can be divided into four blocks. As shown in FIG. 3, when one packet includes a total of 208 bytes, the stream rearranger 110 can divide the packet into blocks of 52 bytes for every six packets. Accordingly, as shown in FIG. 3, a plurality of packets can be divided into N blocks. For convenience of explanation, the blocks divided by the stream rearrangement unit 110 are denoted by 1, 2, 3, 4, ... N-3, N-2, N-1, and N, respectively.

FIG. 4 illustrates a state in which each of the divided blocks is rotated after a stream is divided into blocks in the stream rearranger 110. The stream reordering unit 110 may rotate N blocks in the clockwise direction by 90 degrees. Thus, the six packets a, b, c, d, e, and f are arranged in the vertical direction as shown in FIG. The stream rearrangement unit 110 may sequentially output the rotated blocks as shown in FIG.

In FIG. 4, it is illustrated that the N blocks rotated in the stream rearranger 110 are sequentially output from the first block to the Nth block. However, it is also possible to randomly output the N blocks without outputting sequentially. When the N blocks are output in a random order by the stream rearrangement unit 110, the effect of mixing more data after the interleaving of the interleaving unit 130 can be expected.

5 is a schematic diagram illustrating the state of a stream to which the dummy 20 is added by the dummy inserting unit 120. As shown in FIG. According to FIG. 5, the dummy insert 120 may add a dummy 20 following the data portion 10. In this case, the dummy insertion unit 120 may insert a dummy of an appropriate size in consideration of the memory size of the interleaving unit 130, that is, the interleaving size.

That is, since the interleaving unit 130 includes a plurality of shift memories, in order for the data unit 10 to be stored in the shift memory and then output, a corresponding dummy should be added. Accordingly, since the dummy is input to the interleaving unit 130, the data portion 10 can be normally shifted and output.

6 is a schematic diagram showing a stream state after the interleaving unit 130 interleaves the stream into which the dummy 20 is inserted. The data is interleaved due to the interleaving performed by the interleaving unit 130. In this case, the dummy 20 of FIG. 5 is output after the output of the data portion 10, and therefore, is located on the left side of the data 10 in the case of FIG. The dummy 20 'on the right side of the data may be a dummy for the previous data.

Since the interleaving is performed after rearranging the stream in the stream rearranger 110, the interleaving interval can be sufficiently wide. That is, when a convolutional interleaver as shown in FIG. 2 is used, when a memory path such as M or 2M is selected, the interleaving interval between the same data is only about 4 bytes or 8 bytes. Therefore, the interleaving performance deteriorates.

However, as shown in FIG. 3 to FIG. 5, when the streams are rearranged and the stream is rearranged by adding a dummy stream, the interleaving interval between the same data can be sufficiently wide. As a result, the interleaving performance can be improved.

Meanwhile, as shown in FIG. 6, the apparatus may further include a structure for removing the dummy for transmission after being interleaved with the dummy included.

FIG. 7 is a block diagram illustrating an embodiment in which a stream processing apparatus including the interleaving unit 130 shown in FIG. 2 further includes a dummy removing unit 140 and a burst generating unit 150.

7, the interleaving unit 130 in the present stream processing apparatus 100 can output a stream of the form shown in FIG. 6 to the dummy removing unit 140. [

The dummy removing unit 140 removes the dummy in the stream and the burst generating unit 150 collects the dummy removed stream by the dummy removing unit 140 in a burst unit. If one unit of the stream input to the stream processing apparatus 100 is referred to as one burst, in a state where a dummy is added and removed for processing in the interleaving unit 130, the burst generating unit 150 corresponds to one burst Can be collected and output.

8 is a schematic diagram showing a state in which the dummy removing unit 140 removes a dummy and is collected in burst units by the burst generating unit 150 after being interleaved by the interleaving unit 130 of FIG.

That is, the stream of FIG. 8 can be the final state of the stream output from the present stream processing apparatus 100. According to Fig. 8, the stream has a length corresponding to the number of branches (B) of the convolutional interleaver in the vertical direction of the drawing.

In this case, it can be seen that each packet (a, b, c, d, e, f, ...) of FIG. 5 is interleaved and arranged in a certain unit by looking at the rightmost vertical line of FIG. For example, if a packet is examined, it is interleaved in such a manner that one packet is divided into six sections. As described above, if interleaving is performed by adding a dummy after stream rearrangement, it is possible to prevent the interleaving interval from narrowing at the beginning of the stream in the conventional interleaving scheme. As a result, since stable stream transmission becomes possible, the possibility of stream discarding and retransmission is reduced, and an efficient digital broadcasting service can be provided.

9 is a schematic diagram showing a configuration of a stream processing apparatus according to another embodiment of the present invention. 9, the present stream processing apparatus further includes a RS encoder unit 160, a CRC encoder unit 170, and a burst transfer unit 180 in addition to the stream rearrangement unit 110 and the dummy insertion unit 120.

The stream reordering unit 110 arranges streams in a horizontal direction by a predetermined first size unit, and rearranges the streams in the vertical direction. The shape of the rearranged stream can be confirmed from FIG.

According to Fig. 10, the stream 30 is arranged in the transverse direction by a predetermined first size unit (x2), and the following streams are arranged in the transverse direction in the next line. Accordingly, the streams of the plurality of unit (x1) are arranged in one line. x1 may be variously set according to the embodiment. For example, it can be set to 187 bytes.

When the stream 30 is rearranged in the form as shown in FIG. 10, the RS encoder 160 adds RS parity 40 to the vertical end portion. That is, the RS encoder 160 calculates the RS parity 40 in the vertical direction of the stream 30, and adds the calculated RS parity 40 in the vertical direction.

The CRC encoder unit 170 adds a cyclic redundancy check (CRC) value 50 in the horizontal direction to the stream 30 to which the RS parity 40 is added. The CRC value 50 includes both the CRC value for the stream 30 and the CRC value for the RS parity 40.

As a result, a stream like the one shown in the lower part of FIG. 10 is constructed.

The constructed stream is transmitted in the same manner as in Fig.

11 is a schematic diagram for explaining a stream processing method. 11, the burst transfer unit 180 transmits the stream provided by the dummy insertion unit 120 to the burst units 61, 62, 63, 64, 65, 66, 67 and 68. Here, one burst size may be set to be larger than the horizontal size of the stream including the CRC value 50 portion. In this case, a part of the stream of the next line is included together and transmitted.

That is, transmission is performed in burst units as shown in the right side of Fig. On the other hand, in the case of the last transmission burst 68 in FIG. 11, the stream does not fill one burst unit.

The dummy inserting portion 120 inserts the dummy into the burst 68 so as to fill the empty space in the burst. That is, the dummy inserting unit 120 divides the stream into transmission bursts of a predetermined second size unit, and adds a dummy to the transmission burst size for a stream in which one transmission burst is not formed. Accordingly, the burst transfer unit 180 can transfer data in units of bursts.

As shown in FIGS. 10 and 11, since the RS parity 40 is calculated in the vertical direction of the stream and added in the horizontal direction, the block interleaving is performed as a result. That is, a stream in which the RS parity 40 and the CRC value 50 are added is rearranged and stored in a plurality of memories in the form shown in the lower part of FIG. 10, and then, as shown in FIG. 11, The block interleaving effect can be obtained.

As such, the present stream processing apparatus can be implemented in various ways.

On the other hand, the above-described stream processing apparatuses of various configurations can be used in a digital broadcast transmitter. In addition, the stream to be processed may be a form including only the existing normal data stream, or may be a stream further including an additional data stream robustly processed for errors, or known data for enhancing equalization performance.

In this case, the present stream processing apparatus includes a data processing section for robustly processing the additional data stream and the muxes constituting the stream, a randomizing section for performing randomization, an RS encoder for performing RS encoding, a trellis encoder, A sync multiplexer for adding a field sync or a segment sync to a stream, a modulation unit for performing a modulation operation, and a known data insertion unit for adding known data to a stream with the receiving side . These components may be arranged in various forms to constitute various embodiments.

12 is a flowchart for explaining a stream processing method according to an embodiment of the present invention. Referring to FIG. 12, when a stream is input, stream rearrangement is performed (S1010). The rearrangement method depends on the configuration of the interleaving unit 130. FIG. That is, when the interleaving unit 130 is a convolutional interleaver, the stream is divided into blocks of a predetermined size after being stacked, and can be rotated and rotated at right angles.

On the other hand, when the stream processing apparatus is configured as shown in Fig. 9, and block interleaving occurs, a dummy may be added only for some bursts.

The stacked and rearranged streams may be sequentially output to the rear end or randomly output.

Then, a dummy is added to the output stream (S1020).

As described above, the dummy serves to fill the internal memory of the interleaving unit 130 with a specific value so that the interleaving unit 130 normally interleaves and outputs a stream.

On the other hand, if the stream rearrangement is rearranged as shown in FIGS. 3 to 5 and then the dummy is inserted, the convolution interleaving process may be performed after the dummy addition. Due to the interleaving, each packet in the stream is rearranged at various intervals. In this case, a step of removing the dummy after interleaving may be further included. Further, after the dummy removal, a step of collecting and outputting the stream in units of bursts may be further included. Since this has been described in detail in the above-mentioned section, redundant description will be omitted.

On the other hand, when the stream processing apparatus is implemented as shown in FIG. 9, there may be no separate interleaving step after the dummy addition. That is, in the case of the stream processing apparatus as shown in FIG. 9, the streams are stacked and rearranged, followed by RS encoding and CRC encoding to reconstruct the stream. In this state, output is made in the horizontal direction, so that block interleaving occurs. If one burst is not completely filled with the stream, RS parity, or CRC value in the process, the burst is filled with the corresponding burst.

FIG. 13 is a block diagram illustrating a configuration of a digital broadcast receiver according to an embodiment of the present invention. Referring to FIG. The digital broadcast receiver of FIG. 13 can receive a stream processed by a stream processing apparatus having the configuration of FIG. 1, 7, or 9 and a digital broadcast transmitter including the stream processing apparatus. Specifically, the digital broadcast receiver can be implemented as a portable display device such as a mobile phone, a notebook, a navigation device, an electronic notebook, or a display device such as a TV, a set-top box, or the like.

Referring to FIG. 13, the digital broadcasting receiver includes a tuner 210, a demodulator 220, an equalizer 230, and a deinterleaver 240.

The tuner unit 210 selects a channel and receives the stream.

The demodulator 220 demodulates the stream received from the tuner 210, and the equalizer 230 equalizes the demodulated stream.

The deinterleaver unit 240 deinterleaves the equalized stream and reconstructs the stream into the original state.

The stream received in the digital broadcast receiver of FIG. 13 may be a stream in which the dummy is removed after being subjected to the convolutional interleaving at the transmitting end. That is, it is possible to receive and process the stream of the form shown in FIG.

Alternatively, if the stream is processed in the same manner as in Figs. 10 and 11, the dummy may be a stream that has not been removed. When a stream with no dummy removed is received, the digital broadcast receiver may further include a configuration for removing the dummy.

14 is a block diagram illustrating a configuration of a digital broadcast receiver according to another embodiment of the present invention for receiving a stream including a dummy. The digital broadcasting receiver of FIG. 14 further includes a tuner 210, a demodulator 220, an equalizer 230, a dummy demodulator 250, and a decoder 260.

The dummy removal unit 250 is processed as shown in FIGS. 10 and 11 to remove the dummy from the transmitted stream without dummy removal. That is, in the digital broadcasting receiver of FIG. 14, the digital broadcasting transmitter side performs block interleaving processing, and receives and processes the stream including the dummy.

In this case, the dummy removing unit 250 can check the size of the data area of the stream through the information included in the stream or the information provided through the separate channel, so that the dummy removing unit 250 can grasp the excess size.

The decoder unit 260 decodes the stream with the dummy removed, and restores the stream. In this case, the decoder unit 260 can obtain a block deinterleaving effect by sequentially stacking input streams and then processing the streams in a direction perpendicular to the stacking.

Although not shown in FIG. 13 or 14, the digital broadcasting receiver may further include various configurations such as a trellis decoder, an RS decoder, a reverse randomizer, a demultiplexer, and the like.

Also, the stream received by the digital broadcast receiver in Fig. 13 or 14 may include a normal data stream, an additional data stream robustly processed for errors, known data, and the like.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

1 is a block diagram showing a configuration of a stream processing apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic diagram showing a configuration example including a convolutional interleaver in the stream processing apparatus of FIG. 1;

3 to 6 are schematic diagrams for explaining a stream processing process in a stream processing apparatus using a convolutional interleaver,

Fig. 7 is a block diagram showing an example of a detailed configuration of the stream processing apparatus of Fig. 1,

8 is a schematic diagram showing an example of a stream configuration in a final state in which a dummy is removed,

9 is a schematic diagram showing a configuration of a stream processing apparatus according to another embodiment of the present invention,

10 and 11 are a schematic diagram for explaining a stream processing process in the stream processing apparatus of FIG. 9,

12 is a flowchart for explaining a stream processing method according to an embodiment of the present invention,

13 and 14 are block diagrams illustrating a configuration of a digital broadcast receiver according to various embodiments of the present invention.

Description of the Related Art [0002]

110: stream rearrangement unit 120: dummy insertion unit

130: interleaving unit 140: dummy removing unit

150: burst generation unit 210: tuner unit

220: Demodulator 230:

250: Dummy removing unit 260: Decoder unit

Claims (23)

An RS encoder unit for adding RS parity to the longitudinal end of the stream; A CRC encoder unit for adding a CRC value to a transversal end of a stream to which the RS parity is added; And And a dummy insertion unit for adding a dummy to the stream added with the CRC value. The method according to claim 1, And an interleaving unit for convolutionally interleaving the stream added with the dummy. 3. The method of claim 2, And a stream rearranging unit for stacking and rearranging the streams, The stream rearranging unit, Stacking the streams in a vertical direction by a predetermined number of units, and rearranging the streams by rotating the stacked units by a right angle. The method of claim 3, The stream rearranging unit, Wherein each of the streams is divided into blocks each having a predetermined size and each of the units is subjected to the quadrature rotation. 5. The method of claim 4, The dummy inserting portion includes: And inserts a dummy corresponding to the memory size of the interleaving unit into the stream rotated by the block unit. 5. The method of claim 4, A dummy removing unit removing the dummy from a stream output from the interleaving unit; And And a burst generation unit for collecting the stream from which the dummy is removed in a burst unit. The method of claim 3, The stream rearranging unit, Wherein said streams are arranged in a horizontal direction by a predetermined first size unit, and stacked and rearranged in a vertical direction. delete delete The method of claim 3, Wherein the stream input to the stream rearranging unit is divided into packets each of which has parity added thereto. Adding RS parity to the longitudinal end of the stream; Adding a CRC value to a transversal end of the stream to which the RS parity is added; And And a dummy insertion step of adding a dummy to the stream to which the CRC value is added. 12. The method of claim 11, Further comprising interleaving the stream with the dummy added using a convolutional interleaver. 13. The method of claim 12, And rearranging the streams by stacking and rearranging the streams, The stream rearranging step comprises: Stacking the streams in a vertical direction by a predetermined number of units; And rearranging the stream by rotating the stacked units of the stream by a right angle. 14. The method of claim 13, The step of rearranging the stacked unit-by-unit streams by right- Dividing each of the per-unit streams into blocks of predetermined sizes, and performing the quadrature rotation on a block-by-block basis. 15. The method of claim 14, In the dummy inserting step, And inserting a dummy corresponding to a memory size of the convolutional interleaver into the stream rotated by the block unit. 15. The method of claim 14, Removing the dummy from the interleaved stream; And And collecting the dummy-removed stream in a burst unit. 14. The method of claim 13, The stream rearranging step comprises: And stacking and rearranging the streams in the vertical direction while arranging the streams in a horizontal direction by a predetermined first size unit. 18. The method of claim 17, An RS encoding step of adding RS parity to the longitudinal end of the stream; And And a CRC encoding step of adding a CRC value to a transverse end of the stream added with the RS parity. 19. The method of claim 18, In the dummy inserting step, Dividing the stacked stream into a transmission burst of a predetermined second size unit, and adding a dummy according to a transmission burst size for a stream in which one transmission burst is not performed. 14. The method of claim 13, The stream rearranging step comprises: And rearranges the stream classified by the parity added packet unit. A tuner unit for receiving a stream; A demodulator for demodulating the received stream; An equalizer for equalizing the demodulated stream; And And a deinterleaver unit for deinterleaving the equalized stream, Wherein the stream is processed by adding RS parity to the longitudinal end of the stream on the digital broadcast transmitter side and adding a CRC value to the transverse end of the stream to which the RS parity is added, Digital broadcast receiver. 22. The method of claim 21, Wherein the stream is subjected to convolutional interleaving at the digital broadcast transmitter side, and then the dummy is removed. 22. The method of claim 21, And a dummy removal unit for removing the dummy added to the stream, Wherein the stream is block-interleaved on the digital broadcast transmitter side, and the dummy is added.

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