KR102195376B1 - Transmitter, receiver and controlling method thereof - Google Patents

Abstract

The transmitting device is started. The transmitting device includes a baseband frame generator for generating a baseband frame including a baseband header, a data field, and a padding field, and a mapping unit for mapping a plurality of data streams to the data field, and the baseband frame generator A padding length field indicating the number of bytes is inserted into the baseband frame, and a padding indicator field indicating information on the padding length field is inserted into the baseband header. Accordingly, since the length of the data field can be calculated based on the length of the padding field, the size of the baseband header can be reduced compared to a method of directly displaying the length of the data field.

Description

Transmission device, reception device, and control method thereof {TRANSMITTER, RECEIVER AND CONTROLLING METHOD THEREOF}

The present invention relates to a transmission device, a reception device, and a control method thereof, and more particularly, to a transmission device, a reception device and a control method thereof using the DVB-T2 method.

DVB-T2 (Digital Video Broadcasting the Second Generation Terrestrial) is a second-generation European terrestrial digital broadcasting standard that has been adopted as a standard in more than 35 countries around the world, including Europe, and improved the performance of DVB-T, which is being serviced. -T2 has realized an increase in transmission capacity and high bandwidth efficiency by applying the latest technologies such as LDPC (Low Density Parity Check) code and 256QAM modulation method. Accordingly, it is possible to provide a variety of high-quality services such as HDTV in a limited band. It has the advantage of being.

Meanwhile, in order to use the DVB-T2 scheme, the transmitting device randomly splits a data stream, maps it to a data field of a baseband frame, and attaches a baseband header.

In addition, if the data stream is not sufficiently mapped to the data field or network delay occurs, padding is inserted into the baseband frame.

Conventionally, during L1 Encapsulation, the DFL (Data Field Length) field stored DFL information to directly inform the DFL length, but this directly informs the DFL length in the BBHeader even when padding is not inserted into the baseband frame. There was a problem that the DFL field for this was inserted, resulting in overhead.

An object of the present invention is to provide a transmitting apparatus, a receiving apparatus, and a control method thereof for determining the length of a data field according to whether padding is inserted.

A transmission apparatus according to an embodiment of the present invention for achieving the above object includes a baseband frame generator for generating a baseband frame including a baseband header, a data field, and a padding field, and a plurality of data streams. It includes a mapping unit that maps to a field.

Here, the baseband frame generator inserts a padding length field indicating the number of bytes of the padding field into the baseband frame, and inserts a padding indicator field indicating information on the padding length field into the baseband header. I can.

In addition, the baseband frame generator adds the padding field based on the number of bytes of the data field, sets the number of bytes of the padding length field according to the number of bytes of the added padding field, and sets the number of bytes of the set padding length field. Information on the number of bytes may be displayed in bit units in the padding indicator field.

In addition, the padding indicator field is a first value defining the absence of the padding length field, a second value indicating a state in which the padding length field is 1 byte, and a third value indicating a state in which the padding length field is 2 bytes. It may contain one of.

Specifically, if the number of bytes in the padding field is 0, the baseband frame generator does not insert the padding field and the padding length field, but records the first value in the padding indicator field, and the number of bytes in the padding field is 1 or more. If it is 256 or less, the padding length field is set to 1 byte and the second value is recorded in the padding indicator field, and when the number of bytes of the padding field exceeds 256, the padding length field is set to 2 bytes, and the padding indicator The third value can be recorded in the field.

Meanwhile, when the baseband frame generator adds an ISSY field to the baseband frame, an ISSY indicator field indicating the presence or absence of the ISSY field may be added to the baseband header.

In addition, when the number of bytes of the padding field is less than a preset size, the baseband frame generator adds one padding length field indicating the total number of bytes of the padding field into the padding field, and the number of bytes of the padding field is the size. If exceeds, a first padding length field and a second padding length field are inserted into the padding field, and the first padding length field indicates the presence of the second padding length field in the padding field, and the second padding length The field may indicate the total number of bytes of the padding field.

In addition, the padding indicator field may include a first value defining a case where the padding field does not exist or a second value defining a case where the padding field is present.

Specifically, if the number of bytes in the padding field is 0, the baseband frame generator does not insert the padding field and the padding length field and writes the first value to the padding indicator field, and the number of bytes in the padding field is 1 or more. If it is 256 or less, the padding length field is set to 1 byte and the second value is recorded in the padding indicator field.If the number of bytes in the padding field exceeds 256, the first padding length field and the second padding length field are In addition to the baseband frame, the second value may be recorded in the padding indicator field. Here, the first padding length field is 1 byte, and the second padding length field is 2 bytes.

Further, when the total number of bytes in the padding field exceeds 256, the baseband frame generator inserts the first padding length field and the second padding length field into the padding field, and the first padding length field is 1 It is set as a value expressed in bytes, and the second padding length field may be inserted in a size of 2 bytes at a position corresponding to the set value of the first padding length field.

Meanwhile, when the baseband frame generator adds an ISSY field to the baseband frame, an ISSY indicator field indicating the presence or absence of the ISSY field may be added to the baseband header.

In addition, the padding indicator field includes a first value defining the absence of the padding length field and the padding field, a second value indicating a state in which the padding length field is absent and the padding field is 1 byte, and the padding length It may include one of a third value indicating a state in which the field is 1 byte and a fourth value indicating a state in which the padding length field is 2 bytes.

Here, if the number of bytes of the padding field is 0, the baseband frame generator writes the first value in the padding indicator field without inserting the padding field and the padding length field, and if the number of bytes of the padding field is 1 The padding length field is not inserted and the second value is recorded in the padding indicator field, and when the number of bytes in the padding field exceeds 1 and is 256 or less, the padding length field is set to 1 byte, and the padding indicator field contains the When a third value is recorded and the number of bytes in the padding field exceeds 256, the padding length field may be set to 2 bytes, and the fourth value may be recorded in the padding indicator field.

Meanwhile, the padding indicator field includes a first value defining the absence of the padding length field and the padding field, a second value indicating a state in which the padding length field does not exist and the padding field is 1 byte, and the padding length The field may include one of the third values indicating a state of 2 bytes.

Here, if the number of bytes of the padding field is 0, the baseband frame generator writes the first value in the padding indicator field without inserting the padding field and the padding length field, and if the number of bytes of the padding field is 1 If the padding length field is not inserted and the second value is recorded in the padding indicator field, when the number of bytes in the padding field exceeds 1, the padding length field is set to 2 bytes, and the third value is added to the padding indicator field. Value can be recorded.

Meanwhile, the receiving apparatus according to an embodiment of the present invention includes a receiving unit receiving a transport stream including a baseband frame, a control unit calculating the size of a data field of the baseband frame, and mapping to the data field of the baseband frame. And a processing unit that processes the plurality of data streams.

Here, the baseband frame includes a baseband header, the data field, a padding field, and a padding length field indicating the number of bytes of the padding field, and the baseband header is padding indicating information on the padding length field. May include an indicator field.

And, the control unit detects information on the padding length field based on the padding indicator field, calculates the number of bytes of the padding field based on the detected information, and calculates the number of bytes of the baseband header, the padding The number of bytes in the data field may be calculated based on the number of bytes in the length field and the number of bytes in the padding field.

In addition, when the baseband frame further includes an ISSY field, the baseband header further includes an ISSY indicator field indicating the presence or absence of the ISSY field, and the control unit includes the number of bytes of the baseband header and the padding length field. The number of bytes of the data field may be calculated based on the number of bytes of, the number of bytes of the ISSY field, and the number of bytes of the padding field.

Meanwhile, a method of generating a stream by a transmitting device according to an embodiment of the present invention includes generating a baseband frame including a baseband header, a data field, and a padding field, and mapping a plurality of data streams to the data field. And generating a transport stream including the baseband frame.

Here, the baseband frame may include a padding length field indicating the number of bytes of the padding field, and the baseband header may include a padding indicator field indicating information on the padding length field.

In the step of generating the baseband frame, the padding field is added based on the number of bytes of the data field, and bytes of the padding length field are set according to the number of bytes of the added padding field, and the set padding length Information on the number of bytes of the field may be displayed in bit units in the padding indicator field.

In addition, the padding indicator field is a first value defining the absence of the padding length field, a second value indicating a state in which the padding length field is 1 byte, and a third value indicating a state in which the padding length field is 2 bytes. It may contain one of.

In the step of generating the baseband frame, if the number of bytes of the padding field is 0, the padding field and the padding length field are not inserted, and the first value is recorded in the padding indicator field, and the number of bytes of the padding field is In the case of 1 or more and 256 or less, the padding length field is set to 1 byte, and the second value is recorded in the padding indicator field, and when the number of bytes of the padding field exceeds 256, the padding length field is set to 2 bytes, and the The third value may be recorded in the padding indicator field.

In addition, in the step of generating the baseband frame, when an ISSY field is added to the baseband frame, an ISSY indicator field indicating the presence or absence of the ISSY field may be added to the baseband header.

In addition, in the generating of the baseband frame, if the number of bytes of the padding field is less than or equal to a preset size, one padding length field indicating the total number of bytes of the padding field is added to the padding field, and the number of bytes of the padding field is When the size is exceeded, a first padding length field and a second padding length field are inserted into the padding field, and the first padding length field indicates the existence of the second padding length field in the padding field, and the second The padding length field may indicate the total number of bytes of the padding field.

In addition, the padding indicator field may include a first value defining a case where the padding field does not exist or a second value defining a case where the padding field is present.

Specifically, in the generating of the baseband frame, if the number of bytes in the padding field is 0, the padding field and the padding length field are not inserted, and the first value is recorded in the padding indicator field, and the byte of the padding field is When the number is 1 or more and 255 or less, the padding length field is set to 1 byte and the second value is recorded in the padding indicator field, and when the number of bytes of the padding field exceeds 255, the first padding length field and the second A padding length field is added to the baseband frame, the second value is recorded in the padding indicator field, the first padding length field is 1 byte, and the second padding length field is 2 bytes.

Here, the step of generating the baseband frame includes: when the total number of bytes in the padding field exceeds 256, inserting the first padding length field and the second padding length field into the padding field, and the first padding length The field may be set to a value expressed as 1 byte, and the second padding length field may be inserted with a size of 2 bytes at a position corresponding to the set value of the first padding length field. In addition, the baseband frame is generated. In the step of adding an ISSY field to the baseband frame, an ISSY indicator field indicating the presence or absence of the ISSY field may be added to the baseband header.

Meanwhile, the padding indicator field includes a first value defining the absence of the padding length field and the padding field, a second value indicating a state in which the padding length field does not exist and the padding field is 1 byte, and the padding length It may include one of a third value indicating a state in which the field is 1 byte and a fourth value indicating a state in which the padding length field is 2 bytes.

Here, in the generating of the baseband frame, if the number of bytes in the padding field is 0, the padding field and the padding length field are not inserted, and the first value is recorded in the padding indicator field, and the byte of the padding field If the number is 1, the padding length field is not inserted and the second value is recorded in the padding indicator field, and when the number of bytes of the padding field exceeds 1 and is 256 or less, the padding length field is set to 1 byte and the indicator field If the number of bytes in the padding field exceeds 256, the padding length field may be set to 2 bytes, and the fourth value may be recorded in the padding indicator field.

In addition, the padding indicator field includes a first value defining the absence of the padding length field and the padding field, a second value indicating a state in which the padding length field is absent and the padding field is 1 byte, and the padding length The field may include one of the third values indicating a state of 2 bytes.

Here, in the generating of the baseband frame, if the number of bytes in the padding field is 0, the padding field and the padding length field are not inserted, and the first value is recorded in the padding indicator field, and the byte of the padding field If the number is 1, the padding length field is not inserted and the second value is recorded in the padding indicator field. When the number of bytes in the padding field exceeds 1, the padding length field is set to 2 bytes, and the padding indicator field is The third value can be recorded.

Meanwhile, a method of controlling a reception device according to an embodiment of the present invention includes receiving a transport stream including a baseband frame, calculating a size of a data field of the baseband frame, and the data of the baseband frame. Processing a plurality of data streams mapped to the field.

Here, the baseband frame includes a baseband header, the data field, a padding field, and a padding length field indicating the number of bytes of the padding field, and the baseband header is padding indicating information on the padding length field. May include an indicator field.

In the calculating of the size of the data field of the baseband frame, information on the padding length field is detected based on the padding indicator field, and the number of bytes of the padding field is calculated based on the detected information. The number of bytes of the data field may be calculated based on the number of bytes of the baseband header, the number of bytes of the padding length field, and the number of bytes of the padding field.

Meanwhile, when the baseband frame further includes an ISSY field, the baseband header further includes an ISSY indicator field indicating the presence or absence of the ISSY field, and calculating the size of the data field of the baseband frame, The number of bytes of the data field may be calculated based on the number of bytes of the baseband header, the number of bytes of the padding length field, the number of bytes of the ISSY field, and the number of bytes of the padding field.

According to various embodiments of the present disclosure as described above, since the length of the data field can be calculated based on the length of the padding field, the size of the baseband header can be reduced compared to a method of directly displaying the length of the data field.

1 is a block diagram showing the configuration of a digital broadcasting transmitter using the DVB-T2 scheme to aid understanding of the present invention.
2 is a block diagram showing the configuration of a transmission device 200 according to an embodiment of the present invention.
3 to 8 are views showing the structure of a base band frame according to an embodiment of the present invention.
9A and 9B are tables showing values set in a padding indicator field when a 1-byte padding field is inserted according to an embodiment of the present invention.
10 is a block diagram illustrating a reception process of a reception device using the DVB-T2 scheme.
11 is a block diagram showing the configuration of a receiving device according to an embodiment of the present invention.
12 is a flowchart illustrating a method of generating a stream by a transmission device according to an embodiment of the present invention.
13 is a flowchart illustrating a method of controlling a reception device according to an embodiment of the present invention.

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

1 is a block diagram showing the configuration of a digital broadcasting transmitter using the DVB-T2 scheme to aid understanding of the present invention.

Referring to FIG. 1, a digital broadcast transmitter includes a mode adaptation module 110, a stream adaptation module 120, a bit interleaving and modulation module 130, a frame mapper module 140, and a modulator module 150.

Specifically, the mode adaptation module 110 includes an input interface 111, an input stream synchronizer 112, a null packet remover 113, and A CRC-8 encoder 114 and a baseband header inserter 115 may be included.

Meanwhile, the mode adaptation module 110 generates a BaseBand Frame including at least one PLP generated by an input preprocessor (not shown). Also, when a PLP corresponding to a service is received, the mode adaptation module 110 may generate a baseband frame after separating it into PLPs corresponding to a service component.

Here, the input preprocessor (not shown) may provide at least one PLP to the mode adaptation module 110, and the format of the PLP input to the mode adaptation module 110 is TS (Transport Stream) or GSE stream (Generic Encapsulated Stream), GCS stream (Generic Continuous Stream) or GFPS stream (Generic Fixed-length Packetized Stream).

The stream adaptation module 120 may include a scheduler 121, an in-band signaling/padding inserter 122, and a baseband scrambler 123. I can.

Following the mode adaptation module 110, the stream adaptation module 120 receives data in a PLP unit on which mode adaptation has been performed, and performs stream adaptation in a PLP unit.

In relation to the configuration of the DVB-T2 type digital broadcasting transmission device described above, the baseband frame generator 210 for generating the baseband frame of the transmission device 200 according to an embodiment of the present invention includes the input of FIG. It can be applied to the interface 111, the baseband header inserter 115, and the in-band signaling/padding inserter 122.

2 is a block diagram showing the configuration of a transmission device 200 according to an embodiment of the present invention.

Referring to FIG. 2, the transmission device 200 includes a baseband frame generation unit 210 and a mapping unit 220. Here, the baseband frame generator 210 may generate a baseband frame including a baseband header, a data field, and a padding field.

In addition, the mapping unit 220 may map a plurality of data streams to a data field.

The process of generating a baseband frame in the baseband frame generation unit 210 and mapping the data stream to the data field of the generated baseband frame by the mapping unit 220 is a mode adaptation module of FIG. (110) of the input interface (Input Interface) 111 and the baseband header inserter (Baseband Header Insertion) 115 and the in-band signaling/padding inserter of the Stream Adaptation Module 120 /or Signaling)(122).

Referring to FIG. 1, the input interface 111 may map an input PLP into an international logical-bit format. That is, the first bit may be recognized as a Most Significant Bit (MSB), and the input interface 111 may process each PLP to be mapped in an international logical-bit format.

Specifically, the input interface 111 may perform mapping by dividing the received PLP into a logical unit for performing FEC (BCH/LDPC) encoding in the BICM encoder 130 at a later stage. It is possible to generate a baseband frame from the mapped PLPs divided by.

On the other hand, the baseband header may be added to the generated baseband frame. Specifically, the baseband header inserter 115 is fixed to the front end of the baseband frame to identify the format of the data field of the baseband frame. Headers with size can be inserted. For example, the baseband header is mode adaptation type information indicating whether it is TS, GCS, GSE, or GFPS, user packet length information, data field length. It may include information, such as information and user packet sync byte.

Specifically, the baseband header has a size of 10 bytes, and is inserted in front of the data field to identify the format of the data field.

In addition, the MATYPE located at the front of the baseband header has a size of 2 bytes and has mode adaptation type information. Here, the first byte of MATYPE of 2 bytes is called MATYPE-1, and 2 bits of the first byte of MATYPE-1 are TS/GS field, and the input stream format is GFPS, TS, GCS, and GSE, and the following 1 bit is a SIS/MIS field that identifies whether it is Single Input Stream or Multiple Input Streams, and the next 1 bit is an ISSYI (Input Stream Synchronization Indicator) field, and when the setting value of the ISSYI field is 1, it is activated to calculate the sync timing and calculate the ISSYI field. If the setting value of is 0, it is deactivated. The next 1 bit is an NPD field that identifies whether null packet removal is enabled or disabled. If NPD is enabled, DNP is calculated and added after the UP field. The next 2 bits are EXT fields, and are left empty so that they can be used for the next generation communication standard.

Meanwhile, the UPL field of the baseband header has a size of 2 bytes and stores information on the length of a user packet, the DFL field has a size of 2 bytes and stores information about the length of the data field, and the SYNC field is 1 The SYNCD field has a size of bytes and the sync value of the user packet is copied and stored, and the SYNCD field has a size of 2 bytes and stores the bit distance from the start of the data field to the UP field that is first transmitted after the start point. . In addition, the CRC-8 MODE field has a size of 1 byte and combines a CRC-8 field that detects an error code and a mode field that determines whether the current mode is a normal mode or a high efficiency mode.

However, the baseband header according to an embodiment of the present invention sets the size of the baseband header to 2 bytes, unlike the baseband header of the DVB-T2 standard described above, and the baseband header has a SYNCD field and a padding indicator field (PADI ), or a SYNCD field, a padding indicator field (PADI), and an ISSYI field.

This is to reduce an overhead portion by reducing unnecessary portions used in the baseband header.

Meanwhile, referring to FIG. 2, the baseband frame generator 210 inserts a padding length field (PADL) indicating the number of bytes of the padding field into the baseband frame, and a padding indicator displaying information on the padding length field. A field (PADI) can be inserted into the baseband header.

Specifically, the baseband frame generator 210 may add a padding field based on the number of bytes in the data field. Here, when a plurality of data streams are mapped to a data field without an empty space, a padding field is not added, but when a plurality of data streams are insufficiently mapped to a data field, a padding field may be added. Accordingly, the baseband frame generator 210 may arrange the data field in the area of the baseband frame and add a padding field to the remaining portion.

In addition, the number of bytes of the padding length field may be set according to the number of bytes of the added padding field, and information on the number of bytes of the set padding length field may be displayed in the padding indicator field in bit units.

That is, when a padding field is added to the baseband frame, a padding length field indicating the number of bytes of the padding field is created and inserted into the baseband frame, and the presence or absence of such a padding length field and, if present, the padding length field is several bytes. A padding indicator field indicating whether it has the size of can be created and inserted into the baseband header.

Therefore, unlike the method in which the DFL field of the baseband header used in the existing DVB-T2 standard has a size of 2 bytes and directly stores and displays information on the length of the data field, the length of the padding field is calculated. The length can be calculated, which will be described later.

Meanwhile, the baseband frame generator 210 may generate a baseband frame in the order of a baseband header, a padding length field, a padding field, and a data field. In this case, the padding field may include a padding length field. Therefore, 1 or 2 bytes of bytes of the padding field may be allocated to the padding length field. In addition, the baseband frame generated as described above can be applied to all embodiments of the present invention to be described later.

3 to 8 are views showing the structure of a base band frame according to an embodiment of the present invention.

Referring to FIG. 3, the baseband frame 300 may include a baseband header 310, a padding length field (PADL) 320, a data field 330, and a padding field 340.

In addition, the baseband header (BBHeader) 310 may include a SYNCD field 311, a padding indicator field (PADI) 312, and an RFU field 313. Here, the SYNCD field 311 stores the bit distance from the point where the data field 330 starts to the UP field first transmitted after the start point as described above, and the RFU field is a field reserved for later use. to be.

Meanwhile, the padding indicator field 312 is one of a first value defining the absence of the padding length, a second value indicating a state in which the padding length field is 1 byte, and a third value indicating a state in which the padding length field is 2 bytes. It may include.

Specifically, when the baseband frame 300 includes only the baseband header 310 and the data field 330, and the padding field 340 is not inserted, the baseband frame generator 210 is a byte of the padding field. There is no need to insert the padding length field 320 indicating the number, and thus, the baseband frame generator 210 uses the first value 00 (312-1) in the padding indicator field 312 in the baseband header. And the first value of 00 (312-1) indicates that the padding length field 320 is not inserted in the baseband frame 300.

Meanwhile, when the baseband frame 300 includes the baseband header 310, the data field 330, and the padding field 340, the baseband frame generator 210 determines the number of bytes of the padding field 340. A padding length field 320 to be displayed is inserted, at this time, the number of bytes of the padding length field 340 is determined according to the number of bytes of the padding field 340, and a padding indicator according to the number of bytes of the determined padding length field 340 A second value of 01 (312-2) or a third value of 10 (312-2) may be recorded in the field 312.

Specifically, if the total number of bits of the baseband frame 300 is Kbch, the total number of bytes is Kbch/8, and the maximum number of bytes in the data field 330 is the baseband header 310 in the baseband frame 300. Assuming that it is subtracted Kbch/8-2, the baseband frame generation unit 210 sets the number of bytes in the data field to Kbch/8-2, and when the number of bytes in the padding field 340 becomes 0, that is, the baseband In the case that the remaining areas of the frame 300 minus the baseband header 310 are all data fields, 00 (312-1) is recorded in the padding indicator field without inserting the padding field 340 and the padding length field 320 can do.

In addition, when the number of bytes of the data field 330 is larger than Kbch/8-2-257 and smaller than Kbch/8-2, that is, the padding field 340 is inserted and the padding field ( If the number of bytes of 340) is 1 or more and 256 or less, 1 byte is sufficient to express the number of bytes of the padding field 340, so the padding length field 320 is set to 1 byte, and the padding indicator field 312 is 01 ( 312-2) can be recorded.

At this time, the number of bytes in the padding field 340 is Kbch/8, which is the total number of bytes in the baseband frame 300, minus 2, which is the number of bytes in the baseband header 310, and subtracts 1, which is the number of bytes in the padding length field 320. , Is obtained by subtracting the number of bytes in the data field 330.

Meanwhile, when the number of bytes of the data field 330 is Kbch/8-2-257 or less, that is, when the number of bytes of the padding field 340 exceeds 256, the baseband frame generation unit 210 Since at least 2 bytes are required to represent the number of bytes of 340), the padding length field 320 may be set to 2 bytes and 10 (312-3) may be recorded in the padding indicator field 312.

At this time, the number of bytes in the padding field 340 is Kbch/8, which is the total number of bytes in the baseband frame 300, minus 2, which is the number of bytes in the baseband header 310, and subtracts 2, which is the number of bytes in the padding length field 320. , Is obtained by subtracting the number of bytes in the data field 330.

On the other hand, the baseband frame generation unit 210 may record 11 (312-4) in the padding indicator field 312 for later use if necessary. Referring to FIG. 4, the baseband frame 400 includes a base. A band header (BBHeader) 410, an ISSY field 420, a padding length field (PADL) 430, a data field 440, and a padding field 450 may be included.

In addition, the baseband header (BBHeader) 410 may include a SYNCD field 411, an ISSY indicator field (ISSYI) 412, and a padding indicator field (PADI) 413. That is, when the baseband frame generator 210 adds the ISSY field 420 to the baseband frame 400, the ISSY indicator field (ISSYI) indicating the presence or absence of the ISSY field 420 in the baseband header 410 ) 412 can be added.

Here, since the SYNCD field 411 has already been described above, detailed descriptions are omitted, and the ISSY field (Input Stream Synchronization) 420 transmits the clock counter value according to the clock modulation ratio and the correct timing for restoring the output stream by the receiver Is used to regenerate.

In addition, the transmission method of the ISSY field 420 may be changed according to the input stream format and mode. In the normal mode, the ISSY field 420 is added to the UP of the packaged stream, and in High Efficiency Mode, the BB frame of the BB Can be added to the header and transmitted.

In addition, the ISSY indicator field (Input Stream Synchronization Indicator) 412 is activated when the setting value of the ISSY indicator field 412 is 1 to calculate the sync timing, and when the setting value of the ISSY indicator field is 0, it is deactivated.

Meanwhile, the padding indicator field 413 is one of a first value defining the absence of the padding length, a second value indicating a state in which the padding length field is 1 byte, and a third value indicating a state in which the padding length field is 2 bytes. It may include.

The baseband frame generation unit 210 is activated when the set value of the ISSY indicator field 412 is 1, and may insert the ISSY field 420 into the baseband frame 400.

Assuming that the setting value of the ISSY indicator field 412 is 1, specifically, the baseband frame 400 includes only the baseband header 410, the ISSY field 420, and the data field 440, and the padding field ( When 450) is not inserted, the baseband frame generation unit 210 does not need to insert the padding length field 430 indicating the number of bytes in the padding field 450, and thus, the baseband frame generation unit ( 210) is recorded as a first value of 00 (413-1) in the padding indicator field 413 in the baseband header 410, and the first value of 00 (413-1) indicates that the padding length field 430 is a baseband frame. It indicates that it is not inserted in 400.

On the other hand, when the baseband frame 400 includes a baseband header 410, an ISSY field 420, a data field 440, and a padding field 450, the baseband frame generator 210 includes a padding field ( 450), a padding length field 430 indicating the number of bytes is inserted. In this case, the number of bytes of the padding length field 430 is determined according to the number of bytes of the padding field 450, and the predetermined padding length field 430 Depending on the number of bytes, a second value of 01 (413-2) or a third value of 10 (413-3) may be recorded in the padding indicator field 413.

Specifically, if the total number of bits of the baseband frame 400 is Kbch, the total number of bytes is Kbch/8, and the maximum number of bytes in the data field 440 is the baseband header 410 in the baseband frame 400. Assuming that 2 bytes and 3 bytes of the ISSY field 420 are subtracted to be Kbch/8-5, the baseband frame generator 210 has the number of bytes of the data field 440 Kbch/8-5, and the padding field When the number of bytes of (450) becomes 0, that is, if the remaining areas of the baseband frame 400 minus the baseband header 410 and the ISSY field 420 are all data fields 440, the padding field 450 ) And the padding length field 430 may be recorded in the padding indicator field 00 (413-1).

In addition, the baseband frame generation unit 210 has the number of bytes of the data field 450 larger than Kbch/8-5-257 and smaller than Kbch/8-5, that is, the padding field 450 is inserted and the padding field ( If the number of bytes of 450) is 1 or more and 256 or less, 1 byte is sufficient to express the number of bytes of the padding field 450, so the padding length field 430 is set to 1 byte, and the padding indicator field 413 is 01 ( 413-2) can be recorded.

At this time, the number of bytes of the padding field 450 is Kbch/8, which is the total number of bytes of the baseband frame 400, 2, which is the number of bytes of the baseband header 410, 3, which is the number of bytes of the ISSY field, and the padding length field 430. The number of bytes is 1 and the number of bytes in the data field 330 is subtracted.

On the other hand, when the number of bytes in the data field 440 becomes Kbch/8-5-257 or less, that is, when the number of bytes in the padding field 450 exceeds 256, the baseband frame generator 210 Since at least 2 bytes are required to express the number of bytes of 450), the padding length field 430 may be set to 2 bytes, and 10 (413-3) may be recorded in the padding indicator field 413.

In this case, the number of bytes of the padding field 450 is Kbch/8, which is the total number of bytes of the baseband frame 400, 2, which is the number of bytes of the baseband header 410, 3, which is the number of bytes of the ISSY field 420, and the padding length field ( This is obtained by subtracting the number of bytes of the data field 440 and 2, which is the number of bytes in 430).

Meanwhile, the baseband frame generation unit 210 may record 11 (413-4) in the padding indicator field 413 for later use if necessary.

Meanwhile, when the setting value of the ISSY indicator field 412 is 0, the baseband frame generator 210 does not insert the ISSY field 420 into the baseband frame 400. Accordingly, when the setting value of the ISSY indicator field 412 is 0, the baseband frame generator 210 may generate the baseband frame in the same manner as described in FIG. 3.

Referring to FIG. 5, a baseband frame 500 includes a baseband header (BBHeader) 510, a data field 520, a padding field 530, a padding length field (PADL) 540, and a padding field 340. It may include.

In addition, the baseband header (BBHeader) 510 may include a SYNCD field 511, a padding indicator field (PADI) 512, and an RFU field 513. Here, the SYNCD field 511 stores the bit distance from the start point of the data field 520 to the UP field first transmitted after the start point as described above, and the RFU field is a field reserved for future use. to be.

On the other hand, the padding indicator field 512 is one of a first value defining the absence of the padding length, a second value indicating a state in which the padding length field is 1 byte, and a third value indicating a state in which the padding length field is 2 bytes. It may include.

That is, the baseband frame generation unit 210 adds the padding field 530 based on the number of bytes of the data field 520 and the added padding field ( The number of bytes in the padding length field 540 is set according to the number of bytes in 530), and information on the number of bytes in the set padding length field 540 is stored in the padding indicator field 512 in bit units, that is, 00 (512- 1), 01(512-2), 10(512-3), 11(512-4) can be recorded.

This is the same as the method in which the base band frame generator 210 generates the base band frame 300 in FIG. 3.

However, the baseband frame 500 of FIG. 5 is structurally different in that the padding length field 540 is added after the padding field 530. However, this structural difference is only the difference in the order of generating or reading the baseband frame, and the presence of a padding length field indicating the number of bytes of the padding field and the insertion of a padding indicator field indicating the number of bytes are the same. Do.

Meanwhile, referring to FIG. 6, the baseband frame 600 includes a baseband header 610, an ISSY field 620, a data field 630, a padding field 640, and a padding length field (PADL) ( 650).

In addition, the baseband header (BBHeader) 610 may include a SYNCD field 611, an ISSY indicator field (ISSYI) 612, and a padding indicator field (PADI) 613. That is, when the baseband frame generator 210 adds the ISSY field 620 to the baseband frame 600, the ISSY indicator field (ISSYI) indicating the presence or absence of the ISSY field 620 in the baseband header 610 ) (612) can be added.

That is, the baseband frame generator 210 adds the padding field 640 based on the number of bytes of the data field 630 in order to generate the baseband frame 600 as shown in FIG. 6, and the added padding field ( The number of bytes of the padding length field 650 is set according to the number of bytes of 640), and information on the number of bytes of the set padding length field 650 is stored in the padding indicator field 613 in bit units, that is, 00 (613- 1), 01(613-2), 10(613-3), and 11(613-4) can be recorded.

Meanwhile, when the setting value of the ISSY indicator field 612 is 1, the number of bytes of the padding field 640 is calculated in consideration that the ISSY field 620 is inserted into the baseband frame 600, and the ISSY indicator field 612 If the setting value of) is 0, the number of bytes of the padding field 640 is calculated considering that the ISSY field 620 is not inserted into the baseband frame 600.

This is the same as the method in which the base band frame generator 210 generates the base band frame 400 in FIG. 4.

However, the baseband frame 600 of FIG. 6 is structurally different in that the padding length field 650 is added after the padding field 640. However, this structural difference is only the difference in the order of generating or reading the baseband frame, and the presence of a padding length field indicating the number of bytes of the padding field and inserting a padding indicator field indicating the number of bytes are the same Do.

Referring to FIG. 7, the baseband frame generator 210 pads one padding length field 731 indicating the total number of bytes in the padding field 730 when the number of bytes in the padding field 730 is less than a preset size. In the field, when the number of bytes of the padding field 730 exceeds a preset size, the first padding length field 731 and the second padding length field 732 are inserted into the padding field 730, and the first padding length field ( 731 indicates the presence of the second padding length field 732 in the padding field 730, and the second padding length field 732 may indicate the total number of bytes in the padding field 730.

Specifically, the baseband frame 700 includes a baseband header (BBHeader) 710, a data field 720, a first padding length field 731, and a second padding length field 732. ) Can be included.

In addition, the baseband header (BBHeader) 710 may include a SYNCD field 711, a padding indicator field (PADI) 712, and an RFU field 713. Here, the SYNCD field 711 stores the bit distance from the start point of the data field 720 to the UP field first transmitted after the start point as described above, and the RFU field 713 is used for later use. This is the field left.

Meanwhile, the padding indicator field 712 may include a first value defining a case where the padding field 730 does not exist or a second value defining a case where the padding field 730 is present.

Specifically, when the baseband frame 700 includes only the baseband header 710 and the data field 720, and the padding field 730 is not inserted, the baseband frame generator 210 is a byte of the padding field. It is not necessary to insert the padding length fields 731 and 732 indicating the number, and thus, the baseband frame generator 210 sets a first value of 0 (712-1) to the padding indicator field 712 in the baseband header. ), and a first value of 0 (712-1) indicates that the padding field 730 is not inserted in the baseband frame 700.

Here, the padding field 730 includes padding length fields 731 and 732 unlike FIGS. 3 to 6. That is, if the number of bytes of the padding field 730 is 256, the padding field 730 consists of an inserted padding of 254 bytes and a first padding length field 731 of 1 byte, and the number of bytes of the padding field 730 is 256 If it exceeds 356, the padding field 730 may include an inserted padding of 353 bytes, a first padding length field 731 of 1 byte, and a second padding length field 732 of 2 bytes.

Here, the baseband frame generator 210 inserts the first padding length field 731 and the second padding length field 732 into the padding field 730 when the total number of bytes of the padding field 730 exceeds 256. , The first padding length field 731 is set to a value expressed in 1 byte, and the second padding length field 732 is inserted in a size of 2 bytes at a position corresponding to the set value of the first padding length field 731 Can be.

That is, the first padding length field 731 may be set to one of 256 values expressed by 1 byte. For example, if the setting value in the first padding length field 731 is set to 255, the second padding length field 732 is present in the 255th and 256th bytes from the byte where the first padding length field 731 is located. do.

Meanwhile, when the baseband frame 700 includes a baseband header 710, a data field 720, and a padding field 730, the baseband frame generator 210 determines the number of bytes of the padding field 730. A padding length field to be displayed can be inserted.

Specifically, if the total number of bits of the baseband frame 700 is Kbch, the total number of bytes is Kbch/8, and the maximum number of bytes in the data field 720 is the baseband header 710 in the baseband frame 700. Assuming that the subtraction becomes Kbch/8-2, the baseband frame generator 210 when the number of bytes in the data field 720 becomes Kbch/8-2, and the number of bytes in the padding field 730 becomes 0, that is, , When all the remaining areas of the baseband frame 300 minus the baseband header 710 are the data fields 720, the padding indicator field 712 without inserting the padding field 730 and the padding length fields 731 and 732 You can write 0(712-1) to.

In addition, when the number of bytes of the data field 720 is larger than Kbch/8-2-256 and smaller than Kbch/8-2, that is, the padding field 730 is inserted and the padding field ( When the number of bytes of the padding field 730 is 1 or more and 256 or less, a first padding length field of 1 byte is inserted into the padding field 730 to represent the number of bytes of the padding field 730, and a padding field is placed in the padding indicator field 712. 1 (712-2) indicating that 730 is inserted may be recorded.

Here, as described above, if the number of bytes of the padding field 730 is 256, the padding field 730 is composed of an inserted padding of 255 bytes and a first padding length field 731 of 1 byte. In addition, the reason why 256, not 257, is subtracted from Kbch/8-2-256, which is the standard of the minimum number of bytes of the data field 720, because the first padding length field 731 is inserted in the padding field 730.

In this case, the number of bytes of the padding field 730 is obtained by subtracting the number of bytes of the data field 720 and 2, which is the number of bytes of the baseband header 710, from Kbch/8, which is the total number of bytes of the baseband frame 700.

Meanwhile, when the number of bytes of the data field 720 is Kbch/8-2-256 or less, that is, when the number of bytes of the padding field 730 exceeds 256, the baseband frame generator 210 A first padding length field 731 indicating the presence of the second padding length field 732 by inserting a second padding length field 732 of 2 bytes into the padding field 730 to represent the number of bytes 340 ) May be inserted into the padding field 730, and 1 (712-2) indicating that the padding field 730 is inserted may be recorded in the padding indicator field 712.

Here, the start point of the second padding length field 732 is a location where the 256th byte is located from the end of the baseband frame 700 in which the first padding length field 731 is located, and the first padding length field 731 is Information indicating the existence of the second padding length field 732 may be stored by setting and storing a specific value (for example, 255).

In addition, as described above, if the number of bytes of the padding field 730 exceeds 256, if 356, the padding field 730 includes 353 bytes of inserted padding, a first padding length field 731 of 1 byte, and a 2 byte of padding. It may consist of a second padding length field 732.

In addition, the number of bytes of the padding field 730 is the number of bytes of the baseband header 710 in Kbch/8, which is the total number of bytes of the baseband frame 700, similar to the case where the number of bytes of the padding field 730 is 1 or more and 256 or less. 2 and the number of bytes in the data field 720 are subtracted.

Referring to FIG. 8, the baseband frame 800 may include a baseband header 810, an ISSY field 820, a data field 830, and a padding field 840.

In addition, the baseband header (BBHeader) 810 may include a SYNCD field 811, an ISSY indicator field (ISSYI) 812, a padding indicator field (PADI) 813, and an RFU field 814. That is, when the baseband frame generation unit 210 adds the ISSY field 820 to the baseband frame 800, the ISSY indicator field (ISSYI) indicating the presence or absence of the ISSY field 820 in the baseband header 810 ) 812 can be added.

However, if the number of bytes in the padding field 840 is less than a preset size, the baseband frame generator 210 adds a padding length field 841 indicating the number of bytes in the padding field 840 to the baseband frame, and padding When the number of bytes in the field 840 exceeds a preset size, a second padding length field 842 indicating the number of bytes in the padding field 840 and a first padding length field indicating the presence of the second padding length field 842 ( 841) may be added to the base band frame 800.

Meanwhile, when the setting value of the ISSY indicator field 812 is 1, the number of bytes of the padding field 840 is calculated in consideration that the ISSY field 820 is inserted into the baseband frame 800, and the ISSY indicator field 812 If the setting value of) is 0, the number of bytes of the padding field 840 is calculated considering that the ISSY field 820 is not inserted into the baseband frame 800.

That is, when the setting value of the ISSY indicator field 812 is 0, the number of bytes of the padding field 840 may be calculated in the same manner as in FIG. 7, and the setting value of the ISSY indicator field 812 is 1 and the padding indicator field If the setting value of (813) is 0, since the padding field 840 does not exist, the number of bytes of the data field 830 is Kbch/8, which is the total number of bytes of the baseband frame, and 2, which is the number of bytes of the baseband header, and the ISSY field. It becomes the number of bytes minus 3.

In addition, when the set value of the ISSY indicator field 812 is 1 and the set value of the padding indicator field 813 is 1, the baseband frame generator 210 has the number of bytes in the data field 830 Kbch/8-5. If it is greater than -256 and less than Kbch/8-5, that is, when the padding field 840 is inserted and the number of bytes of the padding field 840 is 1 or more and 256 or less, 1 to express the number of bytes of the padding field 840 A first padding length field 841 of bytes may be inserted into the padding field 840, and 1 (813-2) indicating that the padding field 840 is inserted may be recorded in the padding indicator field 813. .

In addition, as described above, if the number of bytes in the padding field 840 is 256, the padding field 840 is composed of an inserted padding of 255 bytes and a first padding length field 841 of 1 byte. In addition, the reason why 256, not 257, is subtracted from Kbch/8-2-256, which is the standard of the minimum number of bytes of the data field 830, because the first padding length field 841 is inserted in the padding field 840.

In addition, when the set value of the ISSY indicator field 812 is 1 and the set value of the padding indicator field 813 is 1, the baseband frame generator 210 has the number of bytes in the data field 830 Kbch/8-5. When the number of bytes is -256 or less, that is, when the number of bytes in the padding field 840 exceeds 256, a second padding length field 842 of 2 bytes is used in the padding field ( A first padding length field 841, which is inserted into the padding field 840 and indicating the presence of the second padding length field 842, may be inserted into the padding field 840, and the padding field 840 is inserted into the padding indicator field 813. 1 (813-2), indicating that) is inserted can be recorded.

In addition, as described above, if the number of bytes in the padding field 840 exceeds 256, the padding field 840 includes 353 bytes of inserted padding, 1 byte of the first padding length field 841 and 2 bytes. It may consist of a second padding length field 842.

Here, the baseband frame generator 210 inserts the first padding length field 841 and the second padding length field 842 into the padding field 840 when the total number of bytes of the padding field 840 exceeds 256. , The first padding length field 841 is set to a value expressed as 1 byte, and the second padding length field 842 is inserted in a size of 2 bytes at a position corresponding to the set value of the first padding length field 841 Can be.

Here, the number of bytes of the padding field 840 is the baseband header 810 in Kbch/8, which is the total number of bytes of the baseband frame 800, when the number of bytes of the padding field 840 is 1 or more and 256 or less, or exceeds 256. ) Is obtained by subtracting the number of bytes of the ISSY field 820, 3, and the number of bytes of the data field 830.

9A and 9B are tables showing values set in a padding indicator field when a 1-byte padding field is inserted according to an embodiment of the present invention.

Referring to FIG. 9A, the padding indicator field has a padding length field and a first value defining the absence of the padding field, a second value indicating a state in which the padding length field is absent and the padding field is 1 byte, and the padding length field is 1 It may include one of a third value indicating a state of being bytes and a fourth value indicating a state of being 2 bytes in the padding length field.

Here, if the number of bytes in the padding field is 0, the baseband frame generator 210 does not insert the padding field and the padding length field and writes a first value in the padding indicator field, and if the number of bytes in the padding field is 1, the padding length field Is not inserted, and a second value is written to the padding indicator field.If the number of bytes in the padding field exceeds 1 and is 256 or less, the padding length field is set to 1 byte, and a third value is recorded in the padding indicator field. When the number of bytes exceeds 256, the padding length field may be set to 2 bytes, and a fourth value may be recorded in the padding indicator field.

Specifically, when there is no padding field, the baseband frame generator 210 may record 00 (910) in the padding indicator field without inserting the padding length field.

In addition, when the padding field is 1 byte, the baseband frame generator 210 directly indicates that the padding indicator field is padded by 1 byte, so that 01 (920) is not inserted into the padding indicator field without inserting a separate padding length field. Can be recorded.

And, when the number of bytes in the padding field exceeds 1, the baseband frame generator 210 sets the number of bytes in the padding length field to 1 or 2 according to the number of bytes in the padding field, and 10 (930) or 10 in the padding indicator field 11(940) can be recorded.

That is, in the embodiment of FIG. 9A, when the padding field is 1 byte, the embodiment of FIG. 9A directly indicates that the padding indicator field is padded by 1 byte and does not insert a separate padding length field. All can be applied by changing.

Referring to FIG. 9B, the padding indicator field includes a padding length field and a first value defining the absence of the padding field, a second value indicating a state in which the padding length field is absent and the padding field is 1 byte, and the padding length field. It may include one of the third values indicating a state of 2 bytes.

In addition, if the number of bytes in the padding field is 0, the baseband frame generator 210 records a first value in the padding indicator field without inserting the padding field and the padding length field, and if the number of bytes in the padding field is 1, the padding length field is inserted. The second value is recorded in the padding indicator field without not being performed. When the number of bytes in the padding field exceeds 1, the padding length field may be set to 2 bytes, and a third value may be recorded in the padding indicator field.

Specifically, when there is no padding field, the baseband frame generator 210 may record 00 (950) in the padding indicator field without inserting the padding length field.

In addition, when the padding field is 1 byte, the baseband frame generator 210 directly indicates that the padding indicator field is 1 byte padded, so that 01 (960) is not inserted in the padding indicator field without inserting a separate padding length field. Can be recorded.

And, when the number of bytes in the padding field exceeds 1, the baseband frame generator 210 fixedly sets the number of bytes in the padding length field to 2, regardless of the number of bytes in the padding field, and 10 (870) in the padding indicator field. Can be recorded.

Also, the baseband frame generation unit 210 may record 11 (980) in the padding indicator field for later use.

On the other hand, even in the case of FIG. 9B, when the padding field is 1 byte for the above-described embodiment of the present invention, it is indicated that the padding indicator field is padded by 1 byte, and the padding length field is not separately inserted and the padding length All can be applied by changing the point where the number of bytes in the field is fixedly set to 2.

The method of generating the baseband frame as shown in FIG. 9B is different from the method of generating the baseband frame of FIG. 9A in that the padding length field is fixed to 2 bytes. That is, in the case of FIG. 9B, when the padding length field is required, the number of bytes of the padding field is expressed by fixing it to 2 bytes, so that the structure of the baseband frame can be relatively simpler than that of FIG. 9A.

Meanwhile, in order to apply the method of generating the baseband frame of FIG. 9B to the embodiments of FIGS. 7 and 8, the baseband frame generator 210 allocates the last 2 bytes of the baseband frame as a padding length field, and allocates A value obtained by subtracting the number of bytes in the data field and the number of bytes in the baseband header or the number of bytes in the baseband header plus the number of bytes in the ISSY field from Kbch/8, which is the total number of bytes in the baseband frame, to the padding length field of 2 bytes. Information indicating the length of the padding field may be stored.

Meanwhile, the baseband frame generation unit 210 may generate a baseband frame in the order of a baseband header, a padding length field, a padding field, and a data field. In this case, the padding field may include a padding length field, Accordingly, 1 or 2 bytes of bytes of the padding field may be allocated to the padding length field. In addition, the baseband frame generated as described above can be applied to all embodiments of the present invention.

10 is a block diagram illustrating a reception process of a reception device using the DVB-T2 scheme.

The receiving device 1000 includes a DVB-T2 RF module 1010, a DVB-T2 BB module 1020, an accelerator 1030, a frame processor 1040, a demultiplexer 1050, and an audio/video decoder 1060. do.

The DVB-T2 RF module 1010 may receive a DVB-T2 standard transmission signal.

The DVB-T2 BB module 1020 starts an operation when receiving a transmission signal from the DVB-T2 RF module 1010 and performs baseband reception signal processing (synchronization, channel estimation, equalization, deinterleaving, etc.).

The accelerator 1030 performs Low Density Parity Check (LDPC) and Boae, Chaudhuri and Hocquenghem (BCH) decoding for DVB-T2, and may additionally perform Fast Fourier Transform (FFT) for DVB-T2.

The frame processor 1040 may perform a function of processing a data region using header information of a baseband frame of DVB-T2.

The demultiplexer 1050 may perform the reverse process of the Stream Adaptation module and the Mode Adaptation module to regenerate a signal such as TS, GCS, GFPS, or GSE received from the transmitting device.

The audio/video decoder 1060 may reproduce an audio/video signal from a signal such as TS, GCS, GFPS, or GSE.

11 is a block diagram showing the configuration of a receiving device according to an embodiment of the present invention.

The receiving device 1100 includes a receiving unit 1110, a control unit 1120 and a processing unit 1130.

Like the DVB-T2 RF module 1010 of FIG. 10, the receiver 1110 may receive a transport stream including a baseband frame.

The controller 1120 may calculate the size of the data field of the baseband frame.

Specifically, the control unit 1120 may perform functions performed by the DVB-T2 BB module 1020, the accelerator 1030, and the frame processor 1040 of FIG. 10. That is, the control unit 1120 performs baseband signal processing by performing synchronization, channel estimation, equalization, deinterleaving, etc. from the received transport stream, and performs LDPC (Low Density Parity Check) and BCH (Boae, Chaudhuri and Hocquenghem) decoding. To detect the baseband frame. In addition, the controller 1120 may perform a function of processing a data region using header information of a baseband frame.

Meanwhile, the baseband frame includes a baseband header, a data field, a padding field, and a padding length field indicating the number of bytes of the padding field, and the baseband header includes a padding indicator field indicating information about the padding length field. .

Accordingly, the control unit 1120 detects information on the padding length field based on the padding indicator field, calculates the number of bytes in the padding field based on the detected information, and calculates the number of bytes in the baseband header and the number of bytes in the padding length field. And the number of bytes of the data field may be calculated based on the number of bytes of the padding field.

In addition, when the baseband frame further includes an ISSY field, the controller 1120 determines the number of bytes of the baseband header, the number of bytes of the padding length field, the number of bytes of the ISSY field, and the number of bytes of the padding field. Can calculate the number of bytes

In addition, the processing unit 1130 may process a plurality of data streams mapped to the data fields of the baseband frame. That is, the processing unit 1130 may regenerate a signal such as TS, GCS, GFPS, or GSE received from the transmitting device by performing the reverse process of the Stream Adaptation module and the Mode Adaptation module, as in the demultiplexer 1050 of FIG. 10.

12 is a flowchart illustrating a method of generating a stream by a transmission device according to an embodiment of the present invention.

According to the method illustrated in FIG. 12, a baseband frame including a baseband header, a data field, and a padding field may be generated (S1210).

In addition, a plurality of data streams may be mapped to a data field (S1220). Here, the baseband frame may include a padding length field indicating the number of bytes of the padding field, and the baseband header may include a padding indicator field indicating information on the padding length field.

Specifically, the transmitting device adds a padding field based on the number of bytes of the data field, sets the bytes of the padding length field according to the number of bytes of the added padding field, and pads information about the number of bytes of the set padding length field. It can be displayed in bit units in the indicator field.

Here, the padding indicator field includes one of a first value defining the absence of the padding length field, a second value indicating a state in which the padding length field is 1 byte, and a third value indicating a state in which the padding length field is 2 bytes. can do.

Specifically, if the number of bytes in the padding field is 0, the padding field and the padding length field are not inserted and a first value is recorded in the padding indicator field, and when the number of bytes in the padding field is 1 or more and 256 or less, the padding length field is set to 1 byte. A second value is recorded in the padding indicator field, and when the number of bytes in the padding field exceeds 256, the padding length field may be set to 2 bytes, and a third value may be recorded in the padding indicator field.

* In addition, when an ISSY field is added to the baseband frame, an ISSY indicator field indicating the presence or absence of the ISSY field may be added to the base bend header.

On the other hand, if the number of bytes in the padding field is less than a preset size, one padding length field indicating the total number of bytes in the padding field is added to the padding field, and when the number of bytes in the padding field exceeds a preset size, the first padding length in the padding field A field and a second padding length field are inserted, and the first padding length field indicates the existence of the second padding length field in the padding field, and the second padding length field indicates the total number of bytes of the padding field. I can.

Here, the padding indicator field may include a first value defining a case where the padding field does not exist or a second value defining a case where the padding field exists. In addition, if the number of bytes in the padding field is 0, the padding field and the padding length field are not inserted and the first value is recorded in the padding indicator field. If the number of bytes in the padding field is 1 or more and 256 or less, the padding length field is set to 1 byte and padding A second value is recorded in the indicator field, and when the number of bytes of the padding field exceeds 256, a first padding length field and a second padding length field may be added to the baseband frame, and a second value may be recorded in the padding indicator field. . In this case, the first padding length field is 1 byte, and the second padding length field is 2 bytes.

In addition, when the total number of bytes in the padding field exceeds 256, the first padding length field and the second padding length field are inserted into the padding field, and the first padding length field is set to a value expressed as 1 byte, and the second padding length field The field may be inserted in a size of 2 bytes at a position corresponding to the setting value of the first padding length field.

In addition, when an ISSY field is added to the baseband frame, an ISSY indicator field indicating the presence or absence of the ISSY field may be added to the baseband header.

On the other hand, the padding indicator field indicates a padding length field and a first value that defines the absence of the padding field, a second value that indicates a state that the padding length field is absent and the padding field is 1 byte, and the padding length field is 1 byte. It may include one of a third value indicating a state in which the padding length field is 2 bytes.

In this case, if the number of bytes in the padding field is 0, the padding field and the padding length field are not inserted and the first value is recorded in the padding indicator field. If the number of bytes in the padding field is 1, the padding length field is not inserted and subtracted to the padding indicator field. A value of 2 is recorded, and if the number of bytes in the padding field exceeds 1 and is 256 or less, set the padding length field to 1 byte and record a third value in the indicator field, and if the number of bytes in the padding field exceeds 256, the padding length field Is set to 2 bytes and a fourth value can be recorded in the padding indicator field.

On the other hand, the padding indicator field has a padding length field and a first value defining the absence of the padding field, a second value indicating a state in which the padding length field is absent and the padding field is 1 byte, and the padding length field is 2 bytes. It may include one of the third values indicating.

In this case, if the number of bytes in the padding field is 0, the padding field and the padding length field are not inserted and the first value is recorded in the padding indicator field. If the number of bytes in the padding field is 1, the padding length field is not inserted and subtracted to the padding indicator field. A value of 2 is recorded, and when the number of bytes in the padding field exceeds 1, the padding length field may be set to 2 bytes, and a third value may be recorded in the padding indicator field.

13 is a flowchart illustrating a method of controlling a reception device according to an embodiment of the present invention.

According to the method shown in FIG. 13, a transport stream including a baseband frame may be received (S1310).

In addition, the size of the data field of the baseband frame may be calculated (S1320). Here, information on the padding length field is detected based on the padding indicator field, the number of bytes of the padding field is calculated based on the detected information, and the number of bytes of the baseband header, the number of bytes of the padding length field, and The number of bytes in the data field can be calculated based on the number of bytes.

In addition, when the baseband frame further includes an ISSY field, the baseband header further includes an ISSY indicator field indicating the presence or absence of the ISSY field, and the number of bytes of the baseband header, the number of bytes of the padding length field, and the ISSY field. The number of bytes in the data field may be calculated based on the number of bytes and the number of bytes in the padding field.

Meanwhile, a plurality of data streams mapped to the data field of the baseband frame may be processed (S1330).

Meanwhile, a non-transitory computer readable medium in which a program for sequentially performing the control method according to the present invention is stored may be provided.

For example, generating a baseband frame including a baseband header, a data field, and a padding field, mapping a plurality of data streams to the data field, and generating a transport stream including the baseband frame A non-transitory computer readable medium in which a program is stored may be provided.

In addition, as an example, a non-transitory readable medium in which a program that performs the step of calculating the size of the data field of the baseband frame and the step of processing a plurality of data streams mapped to the data field of the baseband frame is stored. computer readable medium) may be provided.

The non-transitory readable medium refers to a medium that stores data semi-permanently and can be read by a device, not a medium that stores data for a short moment, such as a register, cache, or memory. Specifically, the above-described various applications or programs may be provided by being stored in a non-transitory readable medium such as a CD, DVD, hard disk, Blu-ray disk, USB, memory card, and ROM.

In addition, although a bus is not shown in the above-described block diagram of the display device, communication between components in the display device may be performed through a bus. In addition, each device may further include a processor such as a CPU or microprocessor that performs the various steps described above.

In addition, although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. In addition, various modifications are possible by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

200: transmitting device 210: baseband frame generator
220: mapping unit 1100: receiving device
1110: receiving unit 1120: control unit
1130: processing unit

Claims (4)

In the transmission device,
A packet generator for generating a packet including a header and a data field; And
Includes; a transmission unit for transmitting the generated packet,
The header includes a first field including one of a first value, a second value, and a third value,
The first value indicates that the second field and the third field do not exist in the packet,
The second value indicates that the second field having a length of 1 byte exists,
The third value indicates that the second field having a length of 2 bytes exists,
The second field includes length information indicating a length of padding included in the third field,
If the length of the padding is 1 byte and the first field includes the first value, the second field is used as 1 byte of padding,
When the number of bytes in the third field is within a preset threshold value range from 1, the first field includes the second value,
When the number of bytes in the third field exceeds the preset threshold value, the first field includes the third value. The method of claim 1,
The packet generation unit,
When an ISSY field is included in the packet, an ISSY indicator field indicating the presence or absence of the ISSY field is added to the header. In the transmission method,
Generating a packet including a header and a data field; And
Including; transmitting the generated packet;
The header includes a first field including one of a first value, a second value, and a third value,
The first value indicates that the second field and the third field do not exist in the packet,
The second value indicates that the second field having a length of 1 byte exists,
The third value indicates that the second field having a length of 2 bytes exists,
The second field includes length information indicating a length of padding included in the third field,
If the length of the padding is 1 byte and the first field includes the first value, the second field is used as 1 byte of padding,
If the number of bytes in the third field is within a preset threshold range from 1, the first field includes the second value,
When the number of bytes in the third field exceeds the preset threshold value, the first field includes the third value. The method of claim 3,
Generating the packet,
When an ISSY field is included in the packet, an ISSY indicator field indicating the presence or absence of the ISSY field is added to the header.

Images