US20190149369A1 - Transmitter, receiver, and control method thereof regarding transmission packet header - Google Patents
Transmitter, receiver, and control method thereof regarding transmission packet header Download PDFInfo
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- US20190149369A1 US20190149369A1 US16/244,548 US201916244548A US2019149369A1 US 20190149369 A1 US20190149369 A1 US 20190149369A1 US 201916244548 A US201916244548 A US 201916244548A US 2019149369 A1 US2019149369 A1 US 2019149369A1
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- byte number
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/14—Channel dividing arrangements, i.e. in which a single bit stream is divided between several baseband channels and reassembled at the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/42—Arrangements for resource management
- H04H20/423—Transmitter side
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/235—Processing of additional data, e.g. scrambling of additional data or processing content descriptors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6112—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving terrestrial transmission, e.g. DVB-T
Definitions
- Apparatuses and methods consistent with exemplary embodiments relate to a transmitter, a receiver, and a control method thereof, and more particularly, to a transmitter, a receiver, and a control method thereof that uses a Digital Video Broadcasting the Second Generation Terrestrial (DVB-T2) method.
- DVD-T2 Digital Video Broadcasting the Second Generation Terrestrial
- the DVB-T2 is a second-generation European terrestrial digital broadcasting standard to improve performance of Digital Video Broadcasting-Terrestrial (DVB-T) that is currently selected as standard and started to be serviced in more than 35 countries around the world including Europe.
- the DVB-T2 achieves increasing of transmission capacity and high bandwidth efficiency by applying the latest technology such as low density parity check (LDPC) codes, a 256 QAM modulation method, etc. Accordingly, the DVB-T2 has an advantage of being able to provide a variety of high quality services such as HDTV in a limited band.
- LDPC low density parity check
- a transmitter randomly divides data streams, maps the divided data streams to a data field of a baseband frame, and attaches a baseband header.
- a padding field is inserted in the baseband frame.
- a data field length (DFL) field stores DFL information, and thus, plays a role to directly inform the length of the DFL.
- the DFL field directly indicating the DFL length is inserted in the baseband header (BBHeader), which is an overhead in transmission of the data streams.
- One or more exemplary embodiments are provided to address the above drawbacks and other problems associated with the conventional arrangement.
- One or more exemplary embodiments provide a transmitter, a receiver and a control method thereof for determining a length of a data field depending on whether padding is inserted or not.
- a transmitter which may include: a baseband frame generator to generate a baseband frame comprising a baseband header, a data field, and a padding field; and a mapper to map a plurality of data streams to the data field.
- the baseband frame generator may insert a padding length field indicating a byte number of the padding field in the baseband frame, and insert a padding indicator field indicating information about the padding length field in the baseband header.
- the baseband frame generator may add the padding field based on a byte number of the data field, set a byte number of the padding length field depending on the byte number of the added padding field, and indicate information about the set byte number of the padding length field in the padding indicator field.
- the padding indicator field may include one of a first value defining absence of the padding length field, a second value indicating that the padding length field is one byte, and a third value indicating that the padding length field is two bytes.
- the baseband frame generator may not insert the padding field and the padding length field, and record the first value in the padding indicator field. If the byte number of the padding field is greater than or equal to one and less than or equal to 256, the baseband frame generator may set the padding length field as one byte, and record the second value in the padding indicator field. If the byte number of the padding field is greater than 256, the baseband frame generator may set the padding length field as two bytes, and record the third value in the padding indicator field.
- the baseband frame generator may add an ISSY indicator field indicating presence or absence of the ISSY field in the baseband header.
- the baseband frame generator may add one padding length field indicating a total byte number of the padding field within the padding field, and, if the byte number of the padding field is greater than the predetermined size, the baseband frame generator may insert a first padding length field and a second padding length field within the padding field, wherein the first padding length field may indicate presence of the second padding length field within the padding field, and the second padding length field may indicate the total byte number of the padding field.
- the padding indicator field may include a first value indicating that the padding field does not exist or a second value indicating that the padding field exists.
- the baseband frame generator may not insert the padding field and the padding length field, and record the first value in the padding indicator field. If the byte number of the padding field is greater than or equal to one and less than or equal to 256, the baseband frame generator may set the padding length field one byte, and record the second value in the padding indicator field. If the byte number of the padding field is greater than 256, the baseband frame generator may add the first padding length field and the second padding length field within the padding field, and record the second value in the padding indicator field.
- the first padding length field may be one byte
- the second padding length field may be two bytes.
- the first padding length field may be set to a value expressed by one byte or less, and the second padding length field may be inserted in a place corresponding to the set value of the first padding length field with a size of two bytes.
- the baseband frame generator may add an ISSY indicator field indicating presence or absence of the ISSY field in the baseband header.
- the padding indicator field may include one of a first value indicating absence of the padding length field and the padding field, a second value indicating that the padding length field does not exist and the padding field is a predetermined number of bytes, a third value indicating that the padding length field is one byte, and a fourth value indicating that the padding length field is two bytes.
- the predetermined number may be one.
- the baseband frame generator may not insert the padding field and the padding length field, and record the first value in the padding indicator field. If the byte number of the padding field is one, the baseband frame generator may not insert the padding length field, and record the second value in the padding indicator field. If the byte number of the padding field is greater than one and less than or equal to 256, the baseband frame generator may set the padding length field as one byte, and record the third value in the padding indicator field. If the byte number of the padding field is greater than 256, the baseband frame generator may set the padding length field as two bytes, and record the fourth value in the padding indicator field.
- the padding indicator field may include one of a first value indicating absence of the padding length field and the padding field, a second value indicating that the padding length field does not exist and the padding field is one byte, and a third value indicating that the padding length field is two bytes.
- the baseband frame generator may not insert the padding field and the padding length field, and record the first value in the padding indicator field, if the byte number of the padding field is one, the baseband frame generator may not insert the padding length field, and record the second value in the padding indicator field, and if the byte number of the padding field is greater than one, the baseband frame generator may set the padding length field two bytes, and record the third value in the padding indicator field.
- a receiver which may include: a receiving unit to receive a transmission stream comprising a baseband frame; a controller to calculate a size of a data field of the baseband frame; and a processing unit to process a plurality of data streams mapped to the data field of the baseband frame.
- the baseband frame may include a baseband header, the data field, a padding field, and a padding length field indicating a byte number of the padding field
- the baseband header may include a padding indicator field indicating information about the padding length field
- the controller may detect information about the padding length field based on the padding indicator field, calculate a byte number of the padding field based on the detected information, and calculate a byte number of the data field based on a byte number of the baseband header, a byte number of the padding length field, and the byte number of the padding field.
- the baseband header may include an ISSY indicator field indicating presence or absence of the ISSY field, and the controller may calculate the byte number of the data field based on the byte number of the baseband header, the byte number of the padding length field, a byte number of the ISSY field, and the byte number of the padding field.
- a stream generating method of a transmitter which may include: generating a baseband frame comprising a baseband header, a data field, and a padding field; mapping a plurality of data streams to the data field; and generating a transmission stream comprising the baseband frame.
- the baseband frame may include a padding length field indicating a byte number of the padding field
- the baseband header may include a padding indicator field indicating information about the padding length field
- the generating the baseband frame may include adding the padding field based on a byte number of the data field, setting a byte of the padding length field depending on a byte number of the added padding field, and indicating information about the set byte number of the padding length field in the padding indicator field.
- the padding indicator field may include one of a first value indicating absence of the padding length field, a second value indicating that the padding length field is one byte, and a third value indicating that the padding length field is two bytes.
- the generating the baseband frame may include, if the byte number of the padding field is zero, not inserting the padding field and the padding length field, and recording the first value in the padding indicator field, if the byte number of the padding field is greater than or equal to one and less than or equal to 256, setting the padding length field as one byte, and recording the second value in the padding indicator field, and, if the byte number of the padding field is greater than 256, setting the padding length field as two bytes, and recording the third value in the padding indicator field.
- the generating the baseband frame may include, if an ISSY field is added to the baseband frame, adding an ISSY indicator field indicating presence or absence of the ISSY field in the baseband header.
- the generating a baseband frame may include, if the byte number of the padding field is less than or equal to a predetermined size, adding one padding length field indicating a total byte number of the padding field within the padding field, and, if the byte number of the padding field is greater than the predetermined size, inserting a first padding length field and a second padding length field within the padding field, wherein the first padding length field may indicate presence of the second padding length field within the padding field, and the second padding length field may indicate the total byte number of the padding field.
- the padding indicator field may include a first value indicating that the padding field does not exist or a second value indicating that the padding field exists.
- the generating the baseband frame may include, if the byte number of the padding field is zero, not inserting the padding field and the padding length field, and recording the first value in the padding indicator field, if the byte number of the padding field is greater than or equal to one and less than or equal to 256, setting the padding length field as one byte, and recording the second value in the padding indicator field, and, if the byte number of the padding field is greater than 256, adding the first padding length field and the second padding length field within the padding field, and recording the second value in the padding indicator field, wherein the first padding length field may be one byte, and the second padding length field may be two bytes.
- the first padding length field may be set to a value expressed by one byte or less, and the second padding length field may be inserted in a place corresponding to the set value of the first padding length field with a size of two bytes.
- the generating the baseband frame may include, if an ISSY field is added to the baseband frame, adding an ISSY indicator field indicating presence or absence of the ISSY field in the baseband header.
- the padding indicator field may include one of a first value defining absence of the padding length field and the padding field, a second value indicating that the padding length field does not exist and the padding field is one byte, a third value indicating that the padding length field is one byte, and a fourth value indicating that the padding length field is two bytes.
- the generating a baseband frame may include, if the byte number of the padding field is zero, not inserting the padding field and the padding length field, and recording the first value in the padding indicator field, if the byte number of the padding field is one, not inserting the padding length field, and recording the second value in the padding indicator field, if the byte number of the padding field is greater than one (1) and less than or equal to 256, setting the padding length field as one byte, and recording the third value in the padding indicator field, and, if the byte number of the padding field is greater than 256, setting the padding length field as two bytes, and recording the fourth value in the padding indicator field.
- the padding indicator field may include one of a first value indicating absence of the padding length field and the padding field, a second value indicating that the padding length field does not exist and the padding field is one byte, and a third value indicating that the padding length field is two bytes.
- the generating a baseband frame may include, if the byte number of the padding field is zero, not inserting the padding field and the padding length field, and recording the first value in the padding indicator field, if the byte number of the padding field is one, not inserting the padding length field, and recording the second value in the padding indicator field, and, if the byte number of the padding field is greater than one, setting the padding length field as two bytes, and recording the third value in the padding indicator field.
- a control method of a receiver which may include: receiving a transmission stream comprising a baseband frame; calculating a size of a data field of the baseband frame; and processing a plurality of data streams mapped to the data field of the baseband frame.
- the baseband frame may include a baseband header, the data field, a padding field, and a padding length field indicating a byte number of the padding field
- the baseband header may include a padding indicator field indicating information about the padding length field
- the calculating the size of the data field of the baseband frame may include detecting information about the padding length field based on the padding indicator field, calculating the byte number of the padding field based on the detected information, and calculating a byte number of the data field based on a byte number of the baseband header, a byte number of the padding length field, and the byte number of the padding field.
- the baseband header may include an ISSY indicator field indicating presence or absence of the ISSY field
- the calculating the size of the data field of the baseband frame may include calculating the byte number of the data field based on the byte number of the baseband header, the byte number of the padding length field, a byte number of the ISSY field, and the byte number of the padding field.
- a size of a baseband header may be reduced compared to a method that directly indicates the length of the data field.
- FIG. 1 is a block diagram illustrating a configuration of a digital broadcasting transmitter that uses a DVB-T2 method, according to an exemplary embodiment
- FIG. 2 is a block diagram illustrating a configuration of a transmitter according to an exemplary embodiment
- FIGS. 3 and 8 are views illustrating a structure of a baseband frame according to an embodiment
- FIGS. 9A and 9B are a table illustrating values that are set in a padding indicator field if a padding field of one byte is inserted, according to exemplary embodiments;
- FIG. 10 is a block diagram illustrating a receiving process of a receiver using a DVB-T2 method
- FIG. 11 is a block diagram illustrating a configuration of a receiver according to an exemplary embodiment of the present disclosure.
- FIG. 12 is a flowchart for explaining a stream generating method of a transmitter according to an exemplary embodiment of the present disclosure.
- FIG. 13 is a flowchart for explaining a control method of a receiver according to an exemplary embodiment of the present disclosure.
- FIG. 1 is a block diagram illustrating a configuration of a digital broadcasting transmitter that uses a DVB-T2 method, according to an exemplary embodiment of the present disclosure.
- a digital broadcasting transmitter includes a mode adaptation module 110 , a stream adaptation module 120 , a bit interleaver coding and modulation module 130 , a frame mapper module 140 , and a modulator module 150 .
- the mode adaptation module 110 may include an input interface 111 , an input stream synchronizer 112 , a null packet deletion unit 113 , a cyclic redundancy check (CRC)-8 encoder 114 , and a baseband header (BBHeader) insertion unit 115 .
- CRC cyclic redundancy check
- BBHeader baseband header
- the mode adaptation module 110 generates a baseband frame including at least one physical layer pipe (PLP) created in an input free processor (not illustrated). Also, when a PLP corresponding to a service is received, the mode adaptation module 110 may separate the received PLP into PLPs that correspond to service components, and then, generate the baseband frame.
- PLP physical layer pipe
- the input free processor may provide at least one PLP to the mode adaptation module 110 .
- the format of the PLP that is input into the mode adaptation module 110 may be one of transport stream (TS), generic encapsulated stream (GES), generic continuous stream (GCS), generic fixed-length packetized stream (GFPS), etc.
- the stream adaptation module 120 may include a scheduler 121 , an in-band padding and/or signaling insertion unit 122 , and a baseband scrambler 123 .
- the stream adaptation module 120 receives data in a PLP unit on which the mode adaptation was performed, and performs stream adaptation in a PLP unit.
- a baseband frame generator 210 of a transmitter 200 to generate a baseband frame may be applied to the input interface 111 , the BBHeader insertion unit 115 , and the in-band padding and/or signaling insertion unit 122 as illustrated in FIG. 1 .
- FIG. 2 is a block diagram illustrating a configuration of a transmitter according to an exemplary embodiment of the present disclosure.
- the transmitter 200 includes the baseband frame generator 210 and a mapper 220 .
- the baseband frame generator 210 may generate a baseband frame including a BBHeader, a data field, and a padding field.
- the mapper 220 may map a plurality of data streams to the data field.
- Processes in which the baseband frame generator 210 generates the baseband frame and the mapper 220 maps the data streams to the data field of the generated baseband frame may occur in the input interface 111 and the BBHeader insertion unit 115 of the mode adaptation module 110 and the in-band padding and/or signaling insertion unit 122 of the stream adaptation module 120 as illustrated in FIG. 1 .
- the input interface 111 may map PLPs being inputted as an international logical-bit format. In other words, the input interface 111 may process that a first bit is recognized as a most significant bit (MSB) and each PLP is mapped as the international logical-bit format.
- MSB most significant bit
- the input interface 111 may perform mapping by separating the inputted PLPs in a logical unit in order to perform forward error correction (FEC) encoding comprising Bose-Chaudhuri-Hocquenghern (BCH) coding and/or low density parity check (LDPC) coding in the following bit interleaver coding and modulation module (BICM) encoder 130 .
- FEC forward error correction
- BCH Bose-Chaudhuri-Hocquenghern
- LDPC low density parity check
- the input interface 111 may generate the baseband frame from the PLPs that were separated and mapped in a logical unit.
- a BBHeader may be added to the generated baseband frame.
- the BBHeader insertion 115 may insert a header with a fixed size in a front end of the baseband frame to identify a format of the data field of the baseband frame.
- the BBHeader may include information such as mode adaptation type information indicating TS, GCS, GSE or GFPS, user packet length information, data field length information, user packet sync byte information, etc.
- the BBHeader has a size of ten bytes, and is inserted in front of the data field to identify the format of the data field.
- MATYPE that is located at the forefront of the BBHeader has a size of two bytes and the mode adaptation type information.
- the first byte of the two bytes MATYPE is referred to as MATYPE-1
- first two bits of the first byte of the MATYPE-1 is a TS/GS field, and indicates which of GFPS, TS, GCS and GSE the input stream format is.
- a SIS/MIS field indicates whether the baseband frame includes a single input stream or multiple input streams.
- CCM/ACM field whether a constant coding and modulation is performed on the baseband frame or a variable coding and modulation is performed on the baseband frame.
- one bit is an input stream synchronization indicator (ISSYI) field, if a set value of the ISSYI field is one, the ISSYI field is enabled so that sync timing is calculated, and if the set value of the ISSYI field is zero, the ISSYI field is disabled.
- ISSYI input stream synchronization indicator
- NPD NPD field
- the number of deleted null packets is calculated and then added next to a user packet (UP) field.
- EXT field an EXT field, and are left blank to be used for the next generation communication standard.
- a UPL field of the BBHeader has a size of two bytes, and stores information about a user packet length.
- a DFL field has a size of two bytes, and stores information about a data field length.
- a SYNC field has a size of one byte, and copies and stores a sync value of a user packet.
- a SYNCD field has a size of two bytes, and stores a bit distance from a starting point of the data field to an UP field that is first transferred after the starting point.
- a CRC-8 MODE field has a size of one byte, and is a field in which a CRC-8 field to detect an error code and a mode field to determine whether a current mode is a normal mode or a high efficiency mode are combined.
- a BBHeader has a size of two bytes, and may include a SYNCD field and a padding indicator (PADI) field, or may include a SYNCD field, a PADI field, and an ISSYI field, which will be described later.
- PADI padding indicator
- the baseband frame generator 210 inserts a padding length field (PADL) indicating the byte number of the padding field within the baseband frame, that is, the number of bytes that the padding field occupies in the baseband frame, and may insert a PADI indicating information about the PADL in the BBHeader.
- PADL padding length field
- the baseband frame generator 210 may add the padding field based on the byte number of the data field. Here, if a plurality of data streams are mapped in the data field with no empty space, the padding field is not added. If a plurality of data streams is insufficiently mapped in the data field or the data field is not entirely mapped with the plurality of data streams, the padding field may be added. Accordingly, the baseband frame generator 210 may add the padding field to a remaining portion of an area of the baseband frame in which the data field is arranged.
- the byte number of the padding length field that is, the number of bytes that the PADL occupies, may be set depending on the byte number of the added padding field, and information about the byte number of the set PADL may be indicated in the PADI by a bit unit.
- the PADL indicating the byte number of the padding field is generated and inserted in the baseband frame, and then, the PADI indicating whether the PADL exists or not and, if the PADL exists, how many bytes the PADL occupies may be generated and inserted in the BBHeader.
- the current embodiment provides that the length of the data field may be calculated by calculating the length of the padding field. This will be described later.
- the baseband frame generator 210 may generate the baseband frame in the order of the BBHeader, the padding length field, the padding field, and the data field.
- the padding field may include the padding length field, and thus, one or two bytes of the bytes of the padding field may be assigned to the padding length field. Then, the baseband frame created as described above may be applied to all exemplary embodiments of the present disclosure which will be described later.
- FIGS. 3 and 8 are views illustrating a structure of a baseband frame according to an exemplary embodiment of the present disclosure.
- a baseband frame 300 may include a BBHeader 310 , a PADL 320 , a data field 330 , and a padding field 340 .
- the BBHeader 310 may include a SYNCD field 311 , a PADI 312 and an RFU field 313 .
- the SYNCD field 311 stores a bit distance from a starting point of the data field 330 to an UP field that is first transferred after the starting point, and the RFU field 313 is a field that is left to be used in the future.
- the PADI 312 may indicate one of a first value indicating absence of the PADL, a second value indicating that the PADL is one byte, and a third value indicating that the PADL is two bytes.
- the baseband frame generator 210 If the baseband frame 300 includes only the BBHeader 310 and the data field 330 and the padding field 340 is not inserted, the baseband frame generator 210 is not necessary to insert the PADL 320 indicating the byte number of the padding field. Therefore, the baseband frame generator 210 records 00 as the first value 312 - 1 in the PADI 312 within the BBHeader 310 . The 00, the first value 312 - 1 , indicates that the PADL 320 is not inserted within the baseband frame 300 .
- the baseband frame generator 210 inserts the PADL 320 indicating the byte number of the padding field 340 .
- the byte number of the PADL 320 is determined depending on the byte number of the padding field 340 , and then, 01, the second value 312 - 2 or 10, the third value 312 - 3 may be recorded in the PADI 312 depending on the determined byte number of the PADL 320 .
- the baseband frame generator 210 does not insert the padding field 340 and PADL 320 , and then, may record 00 312 - 1 in the PADI 312 .
- the baseband frame generator 210 sets the PADL 320 as one byte, and then, may record 01 312 - 2 in the PADI 312 .
- the byte number of the padding field 340 is calculated by subtracting, from K bch /8 which is the total byte number of the baseband frame 300 , two which is the byte number of the BBHeader 310 , one which is the byte number of the PADL 320 , and the byte number of the data field 330 .
- the baseband frame generator 210 sets the PADL 320 as two bytes, and then, may record 10 312 - 3 in the PADI 312 .
- the byte number of the padding field 340 is calculated by subtracting, from K bch /8 which is the total byte number of the baseband frame 300 , two which is the byte number of the BBHeader 310 , two which is the byte number of the PADL 320 , and the byte number of the data field 330 .
- the baseband frame generator 210 may also record 11 312 - 4 in the PADI 312 for use in the future, if necessary.
- a baseband frame 400 may include a BBHeader 410 , an ISSY field 420 , a PADL 430 , a data field 440 , and a padding field 450 .
- the BBHeader 410 may include a SYNCD field 411 , an ISSY indicator field (ISSYI) 412 , and a PADI 413 .
- ISSYI ISSY indicator field
- PADI 413 a PADI 413 .
- the SYNCD field 411 has already been described in detail; therefore, detailed description thereof will be omitted.
- the ISSY field 420 is used to transfer a clock counter value according to a clock modulation ratio and regenerate correct timing to restore the output stream by a receiver.
- the transfer method of the ISSY field 420 may be changed depending on the input stream format and mode.
- the ISSY field 420 may be transferred by being added to a UP of the packetized stream, and in the high efficiency mode, it may be transferred by being added to the BB header of the BB frame.
- the ISSYI 412 is enabled to calculate sync timing, and if the setting value of the input stream synchronization (ISSY) indicator field 412 is zero, the ISSYI 412 is disabled.
- the PADI 413 may include one of a first value indicating absence of the PADL, a second value indicating that the PADL is one byte, and a third value indicating that the PADL is two bytes.
- the baseband frame generator 210 may be activated and insert the ISSY field 420 in the baseband frame 400 .
- the baseband frame generator 210 does not need to insert the PADL 430 indicating the byte number of the padding field 450 . Accordingly, the baseband frame generator 210 records 00 as the first value 413 - 1 , in the PADI 413 within the BBHeader 410 . The 00, the first value 413 - 1 , represents that the PADL 430 is not inserted in the baseband frame 400 .
- the baseband frame generator 210 inserts the PADL 430 indicating the byte number of the padding field 450 .
- the baseband frame generator 210 determines the byte number of the PADL 430 depending on the byte number of the padding field 450 , and then, may record 01, the second value 413 - 2 , or 10, the third value 413 - 3 , in the PADI 413 depending on the determined byte number of the PADL 430 .
- the total bit number of the baseband frame 400 is K bch
- the total byte number becomes K bch /8
- the maximum byte number of the data field 440 becomes K bch /8-5, where 5 represents two bytes of the BBHeader 310 and three bytes of the ISSY field 420 .
- the byte number of the data field 440 becomes K bch /8-5
- the byte number of the padding field 450 becomes zero.
- the baseband frame generator 210 since the entire area of the baseband frame 400 except the BBHeader 410 and the ISSY field 420 is the data field 440 , the baseband frame generator 210 does not insert the padding field 450 and the PADL 430 , and then, may record 00 413 - 1 in the PADI 413 .
- the baseband frame generator 210 sets the PADL 430 as one byte, and then, may record 01 413 - 2 in the PADI 413 .
- the byte number of the padding field 450 is calculated by subtracting, from K bch /8 which is the total byte number of the baseband frame 300 , two which is the byte number of the BBHeader 410 , three which is the byte number of the ISSY field 420 , one which is the byte number of the PADL 430 , and the byte number of the data field 440 .
- the baseband frame generator 210 sets the PADL 430 as two bytes, and then, may record 10 413 - 3 in the PADI 413 .
- the byte number of the padding field 450 is calculated by subtracting, from K bch /8 which is the total byte number of the baseband frame 400 , two which is the byte number of the BBHeader 410 , three which is the byte number of the ISSY field 420 , two which is the byte number of the PADL 430 , and the byte number of the data field 440 .
- the baseband frame generator 210 may also record 11 413 - 4 in the PADI 413 for use in the future, if necessary.
- the baseband frame generator 210 does not insert the ISSY field 420 within the baseband frame 400 . Accordingly, if the set value of the ISSYI 412 is zero, the baseband frame generator 210 may generate the baseband frame in the same manner as described in FIG. 3 .
- a baseband frame 500 may include a BBHeader 510 , a data field 520 , a padding field 530 and a PADL 540 .
- the BBHeader 510 may include a SYNCD field 511 , a PADI 512 and an RFU field 513 .
- the SYNCD field 511 stores a bit distance from a starting point of the data field 520 to an UP field that is first transferred after the starting point as described above, and the RFU field 513 is a field that is left to be used in the future.
- the PADI 512 may include one of a first value defining absence of the PADL, a second value indicating that the PADL is one byte, and a third value indicating that the PADL is two bytes.
- the baseband frame generator 210 adds the padding field 530 based on the byte number of the data field 520 , sets the byte number of the PADL 540 depending on the byte number of the added padding field 530 , and may record information about the set byte number of the PADL 540 in a bit unit, namely, 00 512 - 1 , 01 512 - 2 , 10 512 - 3 and 11 512 - 4 in the PADI 512 .
- the baseband frame 500 as illustrated in FIG. 5 has a structural difference in that the PADL 540 is added behind the padding field 530 . Due to this structural difference, there may be a difference in the order to generate or read the baseband frame. However, insertion of the PADI indicating the presence or absence of the PADL and the byte number of the PADL, indicating the byte number of the padding field, is the same.
- a baseband frame 600 may include a BBHeader 610 , an ISSY field 620 , a data field 630 , a padding field 640 and a PADL 650 .
- the BBHeader 610 may include a SYNCD field 611 , an ISSYI 612 , and a PADI 613 .
- the baseband frame generator 210 may add the ISSYI 612 indicating presence or absence of the ISSY field 620 to the BBHeader 610 .
- the baseband frame generator 210 adds the padding field 640 based on the byte number of the data field 630 , sets the byte number of the PADL 650 depending on the byte number of the added padding field 640 , and may record information about the set byte number of the PADL 650 in a bit unit, namely, 00 613 - 1 , 01 613 - 2 , 10 613 - 3 , and 11 613 - 4 in the PADI 613 .
- the byte number of the padding field 640 is calculated by considering that the ISSY field 620 is inserted in the baseband frame 600 . If the set value of the ISSYI 612 is zero, the byte number of the padding field 640 is calculated by considering that the ISSY field 620 is not inserted in the baseband frame 600 .
- the baseband frame 600 as illustrated in FIG. 6 has a structural difference in that the PADL 650 is added behind the padding field 640 . Due to this structural difference, there may be a difference in the order to generate or read the baseband frame. However, insertion of the PADI indicating the presence or absence if the PADL and the byte number of the PADL, indicating the byte number of the padding field, is the same.
- the baseband frame generator 210 inserts one PADL 731 indicating the total byte number of the padding field 730 within the padding field 730 , and if the byte number of the padding field 730 is greater than the predetermined size, the baseband frame generator 210 inserts a first PADL 731 and a second PADL 732 within the padding field 730 .
- the first PADL 731 may indicate the presence of the second PADL 732 within the padding field 730
- the second PADL 732 may indicate the total byte number of the padding field 730 .
- the baseband frame 700 may include a BBHeader 710 , a data field 720 and the padding field 730 including the first PADL 731 and the second PADL 732 .
- the BBHeader 710 may include a SYNCD field 711 , a PADI 712 and an RFU field 713 .
- the SYNCD field 711 stores a bit distance from a starting point of the data field 720 to an UP field that is first transferred after the starting point as described above, and the RFU field 713 is a field that is left to be used in the future.
- the PADI 712 may include a first value defining a case that the padding field 730 does not exist or a second value defining a case that the padding field 730 exists.
- the baseband frame generator 210 is not necessary to insert any of the first PADL 731 and second PADL 732 to indicate the byte number of the padding field. Therefore, the baseband frame generator 210 records zero as the first value 712 - 1 in the PADI 712 within the BBHeader 710 , and the 0, the first value 712 - 1 , indicates that the padding field 730 is not inserted within the baseband frame 700 .
- the padding field 730 includes the first PADL 731 and second PADL 732 differently from FIGS. 3, 4, 5 and 6 .
- the padding field 730 includes 255 bytes of padding and one byte of the first PADL 731 .
- the padding field 730 may include the inserted padding of 353 bytes, the first PADL 731 of one byte, and the second PADL 732 of two bytes.
- the baseband frame generator 210 inserts the first PADL 731 and the second PADL 732 in the padding field 730 .
- the first PADL 731 is set to a value expressed by one byte or less, and the second PADL 732 may be inserted in a position corresponding to the set value of the first PADL 731 with a size of two bytes.
- the first PADL 731 may be set to one of 256 values expressed by one byte or less. For example, if the set value of the first PADL 731 is 255, the second PADL 732 exists in the 255th and 256th bytes from the byte at which the first PADL 731 is located.
- the structure of the baseband frame 700 is the same as that of the baseband frame in the above embodiments in that, when the baseband frame 700 includes the BBHeader 710 , the data field 720 and the padding field 730 , the baseband frame generator 210 may insert the PADL indicating the byte number of the padding field 730 .
- the total bit number of the baseband frame 700 is K bch
- the total byte number becomes K bch /8
- the maximum byte number of the data field 720 is K bch /8-2, where 2 represents two bytes allocated for the BBHeader 710 .
- the byte number of the data field 720 becomes K bch /8-2
- the byte number of the padding field 730 is zero.
- the baseband frame generator 210 since the entire area of the baseband frame 700 except an area for the BBHeader 710 is the data field 720 , the baseband frame generator 210 does not insert the padding field 730 , the first PADL 731 and second PADL 732 , and then, may record 0 712 - 1 in the PADI 712 .
- the baseband frame generator 210 may insert the first PADL 731 of one byte within the padding field 730 in order to indicate the byte number of the padding field 730 , and record 1 712 - 2 indicating that the padding field 730 has been inserted in the PADI 712 .
- the padding field 730 includes 255 bytes of padding and one byte of the first PADL 731 .
- the reason that 256 instead of 257 is subtracted from K bch /8-2 in calculating the minimum byte number of the data field 720 is because the first padding length field 731 is inserted within the padding field 730 .
- the byte number of the padding field 730 is calculated by subtracting, from K bch /8 which is the total byte number of the baseband frame 700 , two which is the byte number of the BBHeader 710 and the byte number of the data field 720 .
- the baseband frame generator 210 may insert the second PADL 732 of two bytes within the padding field 730 in order to indicate the byte number of the padding field 730 .
- the baseband frame generator 210 may also insert the first PADL 731 indicating the presence of the second PADL 732 within the padding field 730 , and record 1 712 - 2 indicating that the padding field 730 has been inserted in the PADI 712 .
- a starting point of the second PADL 732 is a place in which the 256 th byte from the end of the baseband frame 700 , where the first PADL 731 is inserted, is located.
- the first PADL 731 may store information indicating the presence of the second PADL 732 as described above by setting and storing a specific value (e.g. 255).
- the padding field 730 may include the inserted padding of 353 bytes, the first PADL 731 of one byte, and the second PADL 732 of two bytes.
- the byte number of the padding field 730 is calculated by subtracting from K bch /8 which is the total byte number of the baseband frame 700 , two which is the byte number of the BBHeader 710 and the byte number of the data field 720 .
- a baseband frame 800 may include a BBHeader 810 , an ISSY field 820 , a data field 830 and a padding field 840 .
- the BBHeader 810 may include a SYNCD field 811 , an ISSYI 812 , a PADI 813 and an RFU field 814 .
- the baseband frame generator 210 may add the ISSYI 812 indicating the presence or absence of the ISSY field 820 to the BBHeader 810 .
- the baseband frame generator 210 adds a PADL 841 indicating the byte number of the padding field 840 in the baseband frame 800 , and if the byte number of the padding field 840 is greater than the predetermined size, the baseband frame generator 210 may add a second PADL 842 indicating the byte number of the padding field 840 and a first PADL 841 indicating the presence of the second PADL 842 in the baseband frame 800 .
- the byte number of the padding field 840 is calculated by considering that the ISSY field 820 has been inserted in the baseband frame 800 . If the set value of the ISSYI 812 is zero, the byte number of the padding field 840 is calculated by considering that the ISSY field 820 is not inserted in the baseband frame 800 .
- the byte number of the padding field 840 may be calculated in the same manner as FIG. 7 . If, however, the set value of the ISSYI 812 is one and the set value of the PADI 813 is zero, the padding field 840 does not exist so that the byte number of the data field 830 is calculated by subtracting from the K bch /8 which is the total byte number of the baseband frame, two which is the byte number of the BBHeader and three which is the byte number of the ISSY field.
- the baseband frame generator 210 may insert a first PADL 841 of one byte within the padding field 840 in order to indicate the byte number of the padding field 840 , and record 1 813 - 2 indicating that the padding field 840 has been inserted in the PADI 813 .
- the padding field 840 includes 255 bytes of padding and one byte of the first PADL 841 .
- the reason that 256 not 257 is subtracted in K bch /8-2 in calculating the minimum byte number of the data field 830 is because the first PADL 841 is inserted within the padding field 840 .
- the baseband frame generator 210 may insert a second PADL 842 of two bytes within the padding field 840 in order to indicate the byte number of the padding field 840 .
- the baseband frame generator 210 may also insert the first PADL 841 indicating the presence of the second PADL 842 within the padding field 840 , and record 1 813 - 2 indicating that the padding field 840 has been inserted in the PADI 813 .
- the padding field 840 may include the inserted padding of 353 bytes, the first PADL 841 of one byte, and the second PADL 842 of two bytes.
- the baseband frame generator 210 inserts the first PADL 841 and second PADL 842 in the padding field 840 .
- the first PADL 841 is set to a value expressed by one byte or less, and the second PADL 842 may be inserted in a position corresponding to the set value of the first PADL 841 with a size of two bytes.
- the byte number of the padding field 840 is calculated by subtracting, from the K bch /8 which is the total byte number of the baseband frame 800 , two which is the byte number of the BBHeader 810 , three which is the byte number of the ISSY field 820 , and the byte number of the data field 830 .
- FIGS. 9A and 9B illustrate a table indicating values that are set in a PADI when a padding field of one byte is inserted according to an exemplary embodiment of the present disclosure.
- a PADI may include one of a first value defining the absence of PADL and padding field, a second value indicating that the PADL does not exist and the padding field is one byte, a third value indicating that the PADL is one byte, and a fourth value indicating that the PADL is two bytes.
- the baseband frame generator 210 does not insert the padding field and the PADL, and records the first value in the padding indicator field. If the byte number of the padding field is one, the baseband frame generator 210 does not insert the PADL, and records the second value in the padding indicator field. If the byte number of the padding field is more than 1 and less than or equal to 256, the baseband frame generator 210 sets the PADL as one byte, and records the third value in the padding indicator field. If the byte number of the padding field is greater than 256, the baseband frame generator 210 sets the PADL as two bytes, and records the fourth value in the padding indicator field.
- the baseband frame generator 210 does not insert the PADL, and may record 00 910 in the PADI.
- the baseband frame generator 210 does not insert separately the PADL by allowing the PADI to directly indicate that one byte padding field is padded, and may record 01 920 in the padding indicator field.
- the baseband frame generator 210 may set the byte number of the PADL to one or two depending on the byte number of the padding field, and record 10 930 or 11 940 in the padding indicator field.
- the exemplary embodiment as illustrated in FIG. 9A may be applied to all the embodiments of the present disclosure as described above.
- the PADI directly indicates that one byte padding field is padded and the PADL is not inserted separately.
- the PADI may include one of a first value defining the absence of PADL and padding field, a second value indicating that the PADL does not exist and the padding field is one byte, and a third value indicating that the PADL is two bytes.
- the baseband frame generator 210 does not insert the padding field and the PADL, and may record the first value in the PADI. If the byte number of the padding field is one, the baseband frame generator 210 does not insert the PADL, and may record the second value in the PADI. If the byte number of the padding field is more than one, the baseband frame generator 210 sets the PADL as two bytes, and may record the third value in the padding indicator field.
- the baseband frame generator 210 may not insert the PADL, and may record 00 950 in the padding length field.
- the baseband frame generator 210 may not insert separately the PADL by allowing the PADI to directly indicate that one byte padding field is padded, and may record 01 960 in the PADI.
- the baseband frame generator 210 may fixedly set the byte number of the PADL to two regardless of the byte number of the padding field, and record 10 970 in the PADI.
- the baseband frame generator 210 may record 11 980 in the PADI for use in the future.
- the exemplary embodiment as illustrated in FIG. 9B may be applied to all the embodiments of the present disclosure as described above.
- the padding field is one byte
- the PADL directly indicates that one byte padding field is padded
- the PADL is not inserted separately
- the byte number of the padding field is more than one
- the byte number of the PADL is fixedly set to two.
- the method for generating the baseband frame as illustrated in FIG. 9B has a difference in that the PADL is fixed as two bytes compared with the method for generating the baseband frame as illustrated in FIG. 9A .
- the baseband frame may have a relatively simple structure compared with FIG. 9A .
- the baseband frame generator 210 assigns the last two bytes of the baseband frame to the PADL, and may store therein information indicating the length of the padding field which is subtracted, from K bch /8 which is the total byte number of the baseband frame, the byte number of the BBHeader or the sum of the byte number of the BBHeader and the byte number of the ISSY field, and the byte number of the data field.
- the baseband frame generator 210 may generate a baseband frame in the order of a baseband header, a PADL, a padding field, and a data field.
- the padding field may include the PADL, and thus, one or two bytes of the bytes of the padding field may be assigned to the PADL. Then, the baseband frame generated in such manner may be applied to all the embodiments of the present disclosure as described above.
- FIG. 10 is a block diagram illustrating a receiving process of a receiver using a DVB-T2 method.
- a receiver 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 .
- the DVB-T2 RF module 1010 may receive transmitted signals of the DVB-T2 standard.
- the DVB-T2 BB module 1020 If receiving the transmitted signals from the DVB-T2 RF module 1010 , the DVB-T2 BB module 1020 starts to operate, and may perform baseband signal processes (synchronization, channel estimation, equalization, deinterleaving, etc.).
- the accelerator 1030 performs LDPC and BCH decoding for the DVB-T2, and, in addition, may perform fast Fourier transform (FFT) for the DVB-T2.
- FFT fast Fourier transform
- the frame processor 1040 may process a data area by using header information of the baseband frame of the DVB-T2.
- the demultiplexer 1050 may regenerate signals such as TS, GCS, GFPS, GSE, etc. received from a transmitter by performing reverse processes of a stream adaptation module and a mode adaptation module.
- the audio/video decoder 1060 may play back audio/video signals from the signals such as TS, GCS, GFPS, GSE, etc.
- FIG. 11 is a block diagram illustrating a configuration of a receiver according to an exemplary embodiment of the present disclosure.
- the receiver 1100 includes a receiving unit 1110 , a controller 1120 and a processing unit 1130 .
- the receiving unit 1110 may receive a transmission stream including a baseband frame like the DVB-T2 RF module 1010 as illustrated in FIG. 10 .
- the controller 1120 may calculate a size of the data field of the baseband frame.
- the controller 1120 may perform functions which are performed by the DVB-T2 BB module 1020 , the accelerator 1030 and the frame processor 1040 as illustrated in FIG. 10 .
- the controller 1120 may perform baseband signal processes by performing synchronization, channel estimation, equalization, deinterleaving, etc. from the received transmission stream, and then, may detect a baseband frame by performing the LDPC and BCH decoding.
- the controller 1120 may perform a function to process the data area by using the header information of the baseband frame.
- the baseband frame may include a baseband header, a data field, a padding field, and a PADL indicating the byte number of the padding field.
- the BBHeader includes a PADI indicating information about the PADL.
- the controller 1120 may detect information about the PADL based on the padding indicator field, calculate the byte number of the padding field based on the detected information, and calculate the byte number of the data field based on the byte number of the baseband header, the byte number of the PADL, and the byte number of the padding field.
- the controller 1120 may calculate the byte number of the data field based on the byte number of the baseband header, the byte number of the PADL, the byte number of the ISSY field and the byte number of the padding field.
- the processing unit 1130 may process a plurality of data streams mapped in the data field of the baseband frame. In other words, the processing unit 1130 may regenerate signals such as TS, GCS, GFPS, GSE, etc. received from a transmitter by performing reverse processes of a stream adaptation module and a mode adaptation module like the demultiplexer 1050 as illustrated in FIG. 10 .
- FIG. 12 is a flowchart for explaining a stream generating method of a transmitter according to an exemplary embodiment of the present disclosure.
- a baseband frame including a baseband header, a data field and a padding field may be generated (S 1210 ).
- the baseband frame may include a PADL indicating the byte number of the padding field
- the BBHeader may include a PADI indicating information for the PADL.
- a transmitter may add the padding field based on the byte number of the data field, set the byte number of the PADL depending on the byte number of the added padding field, and indicate information for the set byte number of the PADL in the PADI in a bit unit.
- the PADI may include one of a first value defining the absence of the PADL, a second value indicating that the PADL is one byte, and a third value indicating that the PADL is two bytes.
- the padding field and the PADL may not be inserted, and the first value may be recorded in the PADI. If the byte number of the padding field is more than or equal to one and less than or equal to 256, the PADL may be set as one byte, and the second value may be recorded in the PADI. If the byte number of the padding field is greater than 256, the PADL may be set as two bytes, and the third value may be recorded in the PADI.
- an ISSYI indicating the presence or absence of the ISSY field may be added to the baseband header.
- the byte number of the padding field is less than or equal to a predetermined size, one PADL indicating the total byte number of the padding field may be inserted within the padding field, and if the byte number of the padding field is more than the predetermined size, a first PADL and a second PADL may be inserted within the padding field.
- the first PADL may indicate the presence of the second PADL within the padding field, and the second PADL may indicate the total byte number of the padding field.
- the PADI may include a first value defining a case that the padding field does not exist or a second value defining a case that the padding field exists. Also, if the byte number of the padding field is zero, the padding field and the PADL are not inserted, and then, the first value is recorded in the PADI. If the byte number of the padding field is more than or equal to one and less than or equal to 256, the PADL is set as one byte, and then, the second value is recorded in the PADI. If the byte number of the padding field is more than 256, the first and second padding length fields are added to the baseband frame, and the second value may be recorded in the PADI. At this time, the first PADL is one byte, and the second PADL is two bytes.
- the first and second padding length fields are inserted in the padding field, the first PADL is set to a value expressed by one byte or less, and the second PADL may be inserted in a place corresponding to the set value of the first PADL with a size of two bytes.
- an ISSYI indicating the presence or absence of the ISSY field may be added to the baseband frame.
- the PADI may include one of a first value defining the absence of PADL and padding field, a second value indicating that the PADL does not exist and the padding field is one byte, a third value indicating that the PADL is one byte, and a fourth value indicating that the PADL is two bytes.
- the padding field and the PADL are not inserted, and then, the first value is recorded in the padding indicator field. If the byte number of the padding field is one, the PADL is not inserted, and then, the second value is recorded in the PADI. If the byte number of the padding field is greater than one and less than or equal to 256, the PADL is set as one byte, and the third value may be recorded in the PADI. If the byte number of the padding field is greater than 256, the PADL is set as two bytes, and then the fourth value may be recorded in the PADI.
- the PADI may include one of a first value defining the absence of PADL and padding field, a second value indicating that the PADL does not exist and the padding field is one byte, and a third value indicating that the PADL is two bytes.
- the byte number of the padding field is zero, the padding field and the PADL are not inserted, and then, the first value is recorded in the PADI. If the byte number of the padding field is one, the PADL is not inserted, and then, the second value is recorded in the PADI. If the byte number of the padding field is greater than one, the PADL is set as two bytes, and the third value may be recorded in the PADI.
- FIG. 13 is a flowchart for explaining a control method of a receiver according to an embodiment of the present disclosure.
- a transmission stream including a baseband frame may be received (S 1310 ).
- a size of a data field of the baseband frame may be calculated (S 1320 ).
- information about a PADL may be detected based on the PADI
- the byte number of the padding field may be calculated based on the detected information
- the byte number of the data field may be calculated based on the byte number of the baseband header, the byte number of the PADL, and the byte number of the padding field.
- the BBHeader further includes an ISSYI indicating the presence or absence of the ISSY field
- the byte number of the data field may be calculated based on the byte number of the baseband header, the byte number of the PADL, the byte number of the ISSY field, and the byte number of the padding field.
- a plurality of data streams mapped in the data field of the baseband frame may be processed (S 1330 ).
- a non-transitory computer-readable medium in which a program performing sequentially the control method according to the embodiment of the present disclosure is stored may be provided.
- a non-transitory computer-readable medium in which a program performing a step of generating a baseband frame including a baseband header, a data field, and a padding field, a step of mapping a plurality of data streams to the data field, and a step of generating a transmission stream including the baseband frame is stored may be provided.
- a non-transitory computer-readable medium in which a program performing a step of calculating a size of the data field of the baseband frame, and a step of processing the plurality of data streams mapped to the data field of the baseband frame is stored may be provided.
- the non-transitory computer-readable medium refers to a medium that can store data in a semi-permanent manner and that can be read by devices.
- the above-described various applications or programs may be stored in and provided with the non-transitory computer readable medium such as a compact disc (CD), a digital versatile disc (DVD), a hard disc, a Blu-ray disc, an universal serial bus (USB), a memory card, a read-only memory (ROM), etc.
- each component may include a processor to perform various steps as described above, such as a central processing unit (CPU), a microprocessor, etc.
- CPU central processing unit
- microprocessor a microprocessor
- each of the components of the transmitter 200 and the receiver 1100 may be embodied as functional block structures and various processing operations. These functional blocks may be embodied as the various numbers of hardware and/or software structures that execute particular functions. For example, each component may use a direct circuit structure, such as a memory, processing, logic, a look-up table, etc. that may execute various functions through controls of one or more microprocessors or other control apparatuses.
- a direct circuit structure such as a memory, processing, logic, a look-up table, etc. that may execute various functions through controls of one or more microprocessors or other control apparatuses.
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Abstract
Description
- This is a continuation of U.S. patent application Ser. No. 14/305,028 filed Jun. 16, 2014 which claims priority from Korean Patent Application No. 10-2013-0075725 filed Jun. 28, 2013 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.
- Apparatuses and methods consistent with exemplary embodiments relate to a transmitter, a receiver, and a control method thereof, and more particularly, to a transmitter, a receiver, and a control method thereof that uses a Digital Video Broadcasting the Second Generation Terrestrial (DVB-T2) method.
- The DVB-T2 is a second-generation European terrestrial digital broadcasting standard to improve performance of Digital Video Broadcasting-Terrestrial (DVB-T) that is currently selected as standard and started to be serviced in more than 35 countries around the world including Europe. The DVB-T2 achieves increasing of transmission capacity and high bandwidth efficiency by applying the latest technology such as low density parity check (LDPC) codes, a 256 QAM modulation method, etc. Accordingly, the DVB-T2 has an advantage of being able to provide a variety of high quality services such as HDTV in a limited band.
- On the other hand, in order to use the DVB-T2 method, a transmitter randomly divides data streams, maps the divided data streams to a data field of a baseband frame, and attaches a baseband header.
- Also, if the data streams are not sufficiently mapped to the data field or if a network delay occurs, a padding field is inserted in the baseband frame.
- When performing L1 encapsulation, a data field length (DFL) field stores DFL information, and thus, plays a role to directly inform the length of the DFL. However, there is a problem that even if the padding field is not inserted in the baseband frame, the DFL field directly indicating the DFL length is inserted in the baseband header (BBHeader), which is an overhead in transmission of the data streams.
- One or more exemplary embodiments are provided to address the above drawbacks and other problems associated with the conventional arrangement. One or more exemplary embodiments provide a transmitter, a receiver and a control method thereof for determining a length of a data field depending on whether padding is inserted or not.
- According to an aspect of an exemplary embodiment, there is provided a transmitter, which may include: a baseband frame generator to generate a baseband frame comprising a baseband header, a data field, and a padding field; and a mapper to map a plurality of data streams to the data field.
- Here, the baseband frame generator may insert a padding length field indicating a byte number of the padding field in the baseband frame, and insert a padding indicator field indicating information about the padding length field in the baseband header.
- The baseband frame generator may add the padding field based on a byte number of the data field, set a byte number of the padding length field depending on the byte number of the added padding field, and indicate information about the set byte number of the padding length field in the padding indicator field.
- The padding indicator field may include one of a first value defining absence of the padding length field, a second value indicating that the padding length field is one byte, and a third value indicating that the padding length field is two bytes.
- In detail, if the byte number of the padding field is zero, the baseband frame generator may not insert the padding field and the padding length field, and record the first value in the padding indicator field. If the byte number of the padding field is greater than or equal to one and less than or equal to 256, the baseband frame generator may set the padding length field as one byte, and record the second value in the padding indicator field. If the byte number of the padding field is greater than 256, the baseband frame generator may set the padding length field as two bytes, and record the third value in the padding indicator field.
- When an ISSY field is added to the baseband frame, the baseband frame generator may add an ISSY indicator field indicating presence or absence of the ISSY field in the baseband header.
- If the byte number of the padding field is less than or equal to a predetermined size, the baseband frame generator may add one padding length field indicating a total byte number of the padding field within the padding field, and, if the byte number of the padding field is greater than the predetermined size, the baseband frame generator may insert a first padding length field and a second padding length field within the padding field, wherein the first padding length field may indicate presence of the second padding length field within the padding field, and the second padding length field may indicate the total byte number of the padding field.
- The padding indicator field may include a first value indicating that the padding field does not exist or a second value indicating that the padding field exists.
- If the byte number of the padding field is zero, the baseband frame generator may not insert the padding field and the padding length field, and record the first value in the padding indicator field. If the byte number of the padding field is greater than or equal to one and less than or equal to 256, the baseband frame generator may set the padding length field one byte, and record the second value in the padding indicator field. If the byte number of the padding field is greater than 256, the baseband frame generator may add the first padding length field and the second padding length field within the padding field, and record the second value in the padding indicator field. Here, the first padding length field may be one byte, and the second padding length field may be two bytes.
- The first padding length field may be set to a value expressed by one byte or less, and the second padding length field may be inserted in a place corresponding to the set value of the first padding length field with a size of two bytes.
- If an ISSY field is added to the baseband frame, the baseband frame generator may add an ISSY indicator field indicating presence or absence of the ISSY field in the baseband header.
- The padding indicator field may include one of a first value indicating absence of the padding length field and the padding field, a second value indicating that the padding length field does not exist and the padding field is a predetermined number of bytes, a third value indicating that the padding length field is one byte, and a fourth value indicating that the padding length field is two bytes. The predetermined number may be one.
- If the byte number of the padding field is zero, the baseband frame generator may not insert the padding field and the padding length field, and record the first value in the padding indicator field. If the byte number of the padding field is one, the baseband frame generator may not insert the padding length field, and record the second value in the padding indicator field. If the byte number of the padding field is greater than one and less than or equal to 256, the baseband frame generator may set the padding length field as one byte, and record the third value in the padding indicator field. If the byte number of the padding field is greater than 256, the baseband frame generator may set the padding length field as two bytes, and record the fourth value in the padding indicator field.
- The padding indicator field may include one of a first value indicating absence of the padding length field and the padding field, a second value indicating that the padding length field does not exist and the padding field is one byte, and a third value indicating that the padding length field is two bytes.
- If the byte number of the padding field is zero, the baseband frame generator may not insert the padding field and the padding length field, and record the first value in the padding indicator field, if the byte number of the padding field is one, the baseband frame generator may not insert the padding length field, and record the second value in the padding indicator field, and if the byte number of the padding field is greater than one, the baseband frame generator may set the padding length field two bytes, and record the third value in the padding indicator field.
- According to an aspect of an exemplary embodiment, there is provided a receiver which may include: a receiving unit to receive a transmission stream comprising a baseband frame; a controller to calculate a size of a data field of the baseband frame; and a processing unit to process a plurality of data streams mapped to the data field of the baseband frame.
- Here, the baseband frame may include a baseband header, the data field, a padding field, and a padding length field indicating a byte number of the padding field, and the baseband header may include a padding indicator field indicating information about the padding length field.
- The controller may detect information about the padding length field based on the padding indicator field, calculate a byte number of the padding field based on the detected information, and calculate a byte number of the data field based on a byte number of the baseband header, a byte number of the padding length field, and the byte number of the padding field.
- If the baseband frame includes an ISSY field, the baseband header may include an ISSY indicator field indicating presence or absence of the ISSY field, and the controller may calculate the byte number of the data field based on the byte number of the baseband header, the byte number of the padding length field, a byte number of the ISSY field, and the byte number of the padding field.
- According to an aspect of an exemplary embodiment, there is provided a stream generating method of a transmitter which may include: generating a baseband frame comprising a baseband header, a data field, and a padding field; mapping a plurality of data streams to the data field; and generating a transmission stream comprising the baseband frame.
- Here, the baseband frame may include a padding length field indicating a byte number of the padding field, and the baseband header may include a padding indicator field indicating information about the padding length field.
- The generating the baseband frame may include adding the padding field based on a byte number of the data field, setting a byte of the padding length field depending on a byte number of the added padding field, and indicating information about the set byte number of the padding length field in the padding indicator field.
- The padding indicator field may include one of a first value indicating absence of the padding length field, a second value indicating that the padding length field is one byte, and a third value indicating that the padding length field is two bytes.
- The generating the baseband frame may include, if the byte number of the padding field is zero, not inserting the padding field and the padding length field, and recording the first value in the padding indicator field, if the byte number of the padding field is greater than or equal to one and less than or equal to 256, setting the padding length field as one byte, and recording the second value in the padding indicator field, and, if the byte number of the padding field is greater than 256, setting the padding length field as two bytes, and recording the third value in the padding indicator field.
- The generating the baseband frame may include, if an ISSY field is added to the baseband frame, adding an ISSY indicator field indicating presence or absence of the ISSY field in the baseband header.
- The generating a baseband frame may include, if the byte number of the padding field is less than or equal to a predetermined size, adding one padding length field indicating a total byte number of the padding field within the padding field, and, if the byte number of the padding field is greater than the predetermined size, inserting a first padding length field and a second padding length field within the padding field, wherein the first padding length field may indicate presence of the second padding length field within the padding field, and the second padding length field may indicate the total byte number of the padding field.
- The padding indicator field may include a first value indicating that the padding field does not exist or a second value indicating that the padding field exists.
- The generating the baseband frame may include, if the byte number of the padding field is zero, not inserting the padding field and the padding length field, and recording the first value in the padding indicator field, if the byte number of the padding field is greater than or equal to one and less than or equal to 256, setting the padding length field as one byte, and recording the second value in the padding indicator field, and, if the byte number of the padding field is greater than 256, adding the first padding length field and the second padding length field within the padding field, and recording the second value in the padding indicator field, wherein the first padding length field may be one byte, and the second padding length field may be two bytes.
- The first padding length field may be set to a value expressed by one byte or less, and the second padding length field may be inserted in a place corresponding to the set value of the first padding length field with a size of two bytes.
- The generating the baseband frame may include, if an ISSY field is added to the baseband frame, adding an ISSY indicator field indicating presence or absence of the ISSY field in the baseband header.
- The padding indicator field may include one of a first value defining absence of the padding length field and the padding field, a second value indicating that the padding length field does not exist and the padding field is one byte, a third value indicating that the padding length field is one byte, and a fourth value indicating that the padding length field is two bytes.
- The generating a baseband frame may include, if the byte number of the padding field is zero, not inserting the padding field and the padding length field, and recording the first value in the padding indicator field, if the byte number of the padding field is one, not inserting the padding length field, and recording the second value in the padding indicator field, if the byte number of the padding field is greater than one (1) and less than or equal to 256, setting the padding length field as one byte, and recording the third value in the padding indicator field, and, if the byte number of the padding field is greater than 256, setting the padding length field as two bytes, and recording the fourth value in the padding indicator field.
- The padding indicator field may include one of a first value indicating absence of the padding length field and the padding field, a second value indicating that the padding length field does not exist and the padding field is one byte, and a third value indicating that the padding length field is two bytes.
- The generating a baseband frame may include, if the byte number of the padding field is zero, not inserting the padding field and the padding length field, and recording the first value in the padding indicator field, if the byte number of the padding field is one, not inserting the padding length field, and recording the second value in the padding indicator field, and, if the byte number of the padding field is greater than one, setting the padding length field as two bytes, and recording the third value in the padding indicator field.
- According to an aspect of an exemplary embodiment, there is provided a control method of a receiver which may include: receiving a transmission stream comprising a baseband frame; calculating a size of a data field of the baseband frame; and processing a plurality of data streams mapped to the data field of the baseband frame.
- Here, the baseband frame may include a baseband header, the data field, a padding field, and a padding length field indicating a byte number of the padding field, and the baseband header may include a padding indicator field indicating information about the padding length field.
- The calculating the size of the data field of the baseband frame may include detecting information about the padding length field based on the padding indicator field, calculating the byte number of the padding field based on the detected information, and calculating a byte number of the data field based on a byte number of the baseband header, a byte number of the padding length field, and the byte number of the padding field.
- If the baseband frame includes an ISSY field, the baseband header may include an ISSY indicator field indicating presence or absence of the ISSY field, and the calculating the size of the data field of the baseband frame may include calculating the byte number of the data field based on the byte number of the baseband header, the byte number of the padding length field, a byte number of the ISSY field, and the byte number of the padding field.
- According to various exemplary embodiments of the present disclosure, since a length of a data field can be calculated based on a length of a padding field, a size of a baseband header may be reduced compared to a method that directly indicates the length of the data field.
- Other objects, advantages and salient features of the present disclosure will become apparent from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments.
- These and/or other aspects of the present disclosure will become apparent and more readily appreciated from the following description of the exemplary embodiments, taken in conjunction with the accompanying drawings, in which:
-
FIG. 1 is a block diagram illustrating a configuration of a digital broadcasting transmitter that uses a DVB-T2 method, according to an exemplary embodiment; -
FIG. 2 is a block diagram illustrating a configuration of a transmitter according to an exemplary embodiment; -
FIGS. 3 and 8 are views illustrating a structure of a baseband frame according to an embodiment; -
FIGS. 9A and 9B are a table illustrating values that are set in a padding indicator field if a padding field of one byte is inserted, according to exemplary embodiments; -
FIG. 10 is a block diagram illustrating a receiving process of a receiver using a DVB-T2 method; -
FIG. 11 is a block diagram illustrating a configuration of a receiver according to an exemplary embodiment of the present disclosure; -
FIG. 12 is a flowchart for explaining a stream generating method of a transmitter according to an exemplary embodiment of the present disclosure; and -
FIG. 13 is a flowchart for explaining a control method of a receiver according to an exemplary embodiment of the present disclosure. - Throughout the drawings, like reference numerals will be understood to refer to like parts, components and structures.
- Hereinafter, certain exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
- The matters defined herein, such as a detailed construction and elements thereof, are provided to assist in a comprehensive understanding of this description. Thus, it is apparent that exemplary embodiments may be carried out without those defined matters. Also, well-known functions or constructions are omitted to provide a clear and concise description of exemplary embodiments.
-
FIG. 1 is a block diagram illustrating a configuration of a digital broadcasting transmitter that uses a DVB-T2 method, according to an exemplary embodiment of the present disclosure. - Referring to
FIG. 1 , a digital broadcasting transmitter includes amode adaptation module 110, astream adaptation module 120, a bit interleaver coding andmodulation module 130, aframe mapper module 140, and amodulator module 150. - The
mode adaptation module 110 may include aninput interface 111, aninput stream synchronizer 112, a nullpacket deletion unit 113, a cyclic redundancy check (CRC)-8encoder 114, and a baseband header (BBHeader)insertion unit 115. - The
mode adaptation module 110 generates a baseband frame including at least one physical layer pipe (PLP) created in an input free processor (not illustrated). Also, when a PLP corresponding to a service is received, themode adaptation module 110 may separate the received PLP into PLPs that correspond to service components, and then, generate the baseband frame. - Here, the input free processor (not illustrated) may provide at least one PLP to the
mode adaptation module 110. The format of the PLP that is input into themode adaptation module 110 may be one of transport stream (TS), generic encapsulated stream (GES), generic continuous stream (GCS), generic fixed-length packetized stream (GFPS), etc. - The
stream adaptation module 120 may include ascheduler 121, an in-band padding and/orsignaling insertion unit 122, and abaseband scrambler 123. - Following the
mode adaptation module 110, thestream adaptation module 120 receives data in a PLP unit on which the mode adaptation was performed, and performs stream adaptation in a PLP unit. - In relation to the configuration of the digital broadcasting transmitter of the DVB-T2 method as described above, a
baseband frame generator 210 of atransmitter 200 to generate a baseband frame according to an exemplary embodiment as described below in reference toFIG. 2 may be applied to theinput interface 111, theBBHeader insertion unit 115, and the in-band padding and/orsignaling insertion unit 122 as illustrated inFIG. 1 . -
FIG. 2 is a block diagram illustrating a configuration of a transmitter according to an exemplary embodiment of the present disclosure. - Referring to
FIG. 2 , thetransmitter 200 includes thebaseband frame generator 210 and amapper 220. Here, thebaseband frame generator 210 may generate a baseband frame including a BBHeader, a data field, and a padding field. - The
mapper 220 may map a plurality of data streams to the data field. - Processes in which the
baseband frame generator 210 generates the baseband frame and themapper 220 maps the data streams to the data field of the generated baseband frame may occur in theinput interface 111 and theBBHeader insertion unit 115 of themode adaptation module 110 and the in-band padding and/orsignaling insertion unit 122 of thestream adaptation module 120 as illustrated inFIG. 1 . - Referring to
FIG. 1 , theinput interface 111 may map PLPs being inputted as an international logical-bit format. In other words, theinput interface 111 may process that a first bit is recognized as a most significant bit (MSB) and each PLP is mapped as the international logical-bit format. - The
input interface 111 may perform mapping by separating the inputted PLPs in a logical unit in order to perform forward error correction (FEC) encoding comprising Bose-Chaudhuri-Hocquenghern (BCH) coding and/or low density parity check (LDPC) coding in the following bit interleaver coding and modulation module (BICM)encoder 130. Theinput interface 111 may generate the baseband frame from the PLPs that were separated and mapped in a logical unit. - A BBHeader may be added to the generated baseband frame. In detail, the
BBHeader insertion 115 may insert a header with a fixed size in a front end of the baseband frame to identify a format of the data field of the baseband frame. For example, the BBHeader may include information such as mode adaptation type information indicating TS, GCS, GSE or GFPS, user packet length information, data field length information, user packet sync byte information, etc. - The BBHeader has a size of ten bytes, and is inserted in front of the data field to identify the format of the data field.
- MATYPE that is located at the forefront of the BBHeader has a size of two bytes and the mode adaptation type information. Here, the first byte of the two bytes MATYPE is referred to as MATYPE-1, and first two bits of the first byte of the MATYPE-1 is a TS/GS field, and indicates which of GFPS, TS, GCS and GSE the input stream format is. Following one bit is a SIS/MIS field, and indicates whether the baseband frame includes a single input stream or multiple input streams. Following one bit is a CCM/ACM field whether a constant coding and modulation is performed on the baseband frame or a variable coding and modulation is performed on the baseband frame. As following one bit is an input stream synchronization indicator (ISSYI) field, if a set value of the ISSYI field is one, the ISSYI field is enabled so that sync timing is calculated, and if the set value of the ISSYI field is zero, the ISSYI field is disabled. Following one bit is a NPD field, and indicates whether the null packet deletion is enabled or disabled. If the NPD is enabled, the number of deleted null packets is calculated and then added next to a user packet (UP) field. Following two bits are an EXT field, and are left blank to be used for the next generation communication standard.
- A UPL field of the BBHeader has a size of two bytes, and stores information about a user packet length. A DFL field has a size of two bytes, and stores information about a data field length. A SYNC field has a size of one byte, and copies and stores a sync value of a user packet. A SYNCD field has a size of two bytes, and stores a bit distance from a starting point of the data field to an UP field that is first transferred after the starting point. A CRC-8 MODE field has a size of one byte, and is a field in which a CRC-8 field to detect an error code and a mode field to determine whether a current mode is a normal mode or a high efficiency mode are combined.
- However, unlike the BBHeader of the above-described DVB-T2 standard, a BBHeader according to an exemplary embodiment of the present disclosure has a size of two bytes, and may include a SYNCD field and a padding indicator (PADI) field, or may include a SYNCD field, a PADI field, and an ISSYI field, which will be described later.
- This is to reduce a portion which is an overhead by reducing unnecessary portions used in the BBHeader.
- Referring to
FIG. 2 , thebaseband frame generator 210 inserts a padding length field (PADL) indicating the byte number of the padding field within the baseband frame, that is, the number of bytes that the padding field occupies in the baseband frame, and may insert a PADI indicating information about the PADL in the BBHeader. - The
baseband frame generator 210 may add the padding field based on the byte number of the data field. Here, if a plurality of data streams are mapped in the data field with no empty space, the padding field is not added. If a plurality of data streams is insufficiently mapped in the data field or the data field is not entirely mapped with the plurality of data streams, the padding field may be added. Accordingly, thebaseband frame generator 210 may add the padding field to a remaining portion of an area of the baseband frame in which the data field is arranged. - Also, the byte number of the padding length field, that is, the number of bytes that the PADL occupies, may be set depending on the byte number of the added padding field, and information about the byte number of the set PADL may be indicated in the PADI by a bit unit.
- In other words, if the padding field is added to the baseband frame, the PADL indicating the byte number of the padding field is generated and inserted in the baseband frame, and then, the PADI indicating whether the PADL exists or not and, if the PADL exists, how many bytes the PADL occupies may be generated and inserted in the BBHeader.
- Accordingly, unlike a method in which the DFL field of the BBHeader being used in the existing DVB-T2 standard has a size of two bytes, directly stores and indicates information about the data field length, the current embodiment provides that the length of the data field may be calculated by calculating the length of the padding field. This will be described later.
- The
baseband frame generator 210 may generate the baseband frame in the order of the BBHeader, the padding length field, the padding field, and the data field. In this case, the padding field may include the padding length field, and thus, one or two bytes of the bytes of the padding field may be assigned to the padding length field. Then, the baseband frame created as described above may be applied to all exemplary embodiments of the present disclosure which will be described later. -
FIGS. 3 and 8 are views illustrating a structure of a baseband frame according to an exemplary embodiment of the present disclosure. - Referring to
FIG. 3 , abaseband frame 300 may include aBBHeader 310, aPADL 320, adata field 330, and apadding field 340. - The
BBHeader 310 may include aSYNCD field 311, aPADI 312 and anRFU field 313. TheSYNCD field 311 stores a bit distance from a starting point of thedata field 330 to an UP field that is first transferred after the starting point, and theRFU field 313 is a field that is left to be used in the future. - The
PADI 312 may indicate one of a first value indicating absence of the PADL, a second value indicating that the PADL is one byte, and a third value indicating that the PADL is two bytes. - If the
baseband frame 300 includes only theBBHeader 310 and thedata field 330 and thepadding field 340 is not inserted, thebaseband frame generator 210 is not necessary to insert thePADL 320 indicating the byte number of the padding field. Therefore, thebaseband frame generator 210records 00 as the first value 312-1 in thePADI 312 within theBBHeader 310. The 00, the first value 312-1, indicates that thePADL 320 is not inserted within thebaseband frame 300. - However, if the
baseband frame 300 includes theBBHeader 310, thedata field 330 and thepadding field 340, thebaseband frame generator 210 inserts thePADL 320 indicating the byte number of thepadding field 340. At this time, the byte number of thePADL 320 is determined depending on the byte number of thepadding field 340, and then, 01, the second value 312-2 or 10, the third value 312-3 may be recorded in thePADI 312 depending on the determined byte number of thePADL 320. - Specifically, if the total bit number of the
baseband frame 300 is Kbch, the total byte number becomes Kbch/8, and the maximum byte number of thedata field 330 is Kbch/8-2, where 2 represents two bytes allocated for theBBHeader 310. At this time, since the byte number of thedata field 330 is Kbch/8-2, the byte number of thepadding field 340 is zero. In other words, since the entire area of thebaseband frame 300 except an area for theBBHeader 310 is the data field, thebaseband frame generator 210 does not insert thepadding field 340 andPADL 320, and then, may record 00 312-1 in thePADI 312. - Also, if the byte number of the
data field 330 is greater than Kbch/8-2-257 and less than Kbch/8-2, that is, if thepadding field 340 is inserted and the byte number of thepadding field 340 is greater than or equal to one and less than or equal to 256, one byte is sufficient to represent the byte number of thepadding field 340. In this case, thebaseband frame generator 210 sets thePADL 320 as one byte, and then, may record 01 312-2 in thePADI 312. - At this time, the byte number of the
padding field 340, that is, the number of bytes of the padding field, is calculated by subtracting, from Kbch/8 which is the total byte number of thebaseband frame 300, two which is the byte number of theBBHeader 310, one which is the byte number of thePADL 320, and the byte number of thedata field 330. - On the other hand, if the byte number of the
data field 330 is less than or equal to Kbch/8-2-257, that is, if the byte number of thepadding field 340 is greater than 256, at least two bytes are needed to represent the byte number of thepadding field 340. In this case, thebaseband frame generator 210 sets thePADL 320 as two bytes, and then, may record 10 312-3 in thePADI 312. - At this time, the byte number of the
padding field 340 is calculated by subtracting, from Kbch/8 which is the total byte number of thebaseband frame 300, two which is the byte number of theBBHeader 310, two which is the byte number of thePADL 320, and the byte number of thedata field 330. - The
baseband frame generator 210 may also record 11 312-4 in thePADI 312 for use in the future, if necessary. - Referring to
FIG. 4 , abaseband frame 400 may include aBBHeader 410, anISSY field 420, aPADL 430, adata field 440, and apadding field 450. - The
BBHeader 410 may include aSYNCD field 411, an ISSY indicator field (ISSYI) 412, and aPADI 413. In other words, if theISSY field 420 is added to thebaseband frame 400, thebaseband frame generator 210 may add theISSYI 412 indicating presence or absence of theISSY field 420 to theBBHeader 410. - Here, the
SYNCD field 411 has already been described in detail; therefore, detailed description thereof will be omitted. TheISSY field 420 is used to transfer a clock counter value according to a clock modulation ratio and regenerate correct timing to restore the output stream by a receiver. - Also, the transfer method of the
ISSY field 420 may be changed depending on the input stream format and mode. In the normal mode, theISSY field 420 may be transferred by being added to a UP of the packetized stream, and in the high efficiency mode, it may be transferred by being added to the BB header of the BB frame. - Also, if a set value of the
ISSYI 412 is one, theISSYI 412 is enabled to calculate sync timing, and if the setting value of the input stream synchronization (ISSY)indicator field 412 is zero, theISSYI 412 is disabled. - The
PADI 413 may include one of a first value indicating absence of the PADL, a second value indicating that the PADL is one byte, and a third value indicating that the PADL is two bytes. - If the setting value of the
ISSYI 412 is one, thebaseband frame generator 210 may be activated and insert theISSY field 420 in thebaseband frame 400. - If the setting value of the
ISSYI 412 is one, thebaseband frame 400 includes only theBBHeader 410, theISSY field 420 and thedata field 440, and thepadding field 450 is not inserted, thebaseband frame generator 210 does not need to insert thePADL 430 indicating the byte number of thepadding field 450. Accordingly, thebaseband frame generator 210records 00 as the first value 413-1, in thePADI 413 within theBBHeader 410. The 00, the first value 413-1, represents that thePADL 430 is not inserted in thebaseband frame 400. - If, however, the
baseband frame 400 includes theBBHeader 410, theISSY field 420, thedata field 440 and thepadding field 450, thebaseband frame generator 210 inserts thePADL 430 indicating the byte number of thepadding field 450. At this time, thebaseband frame generator 210 determines the byte number of thePADL 430 depending on the byte number of thepadding field 450, and then, may record 01, the second value 413-2, or 10, the third value 413-3, in thePADI 413 depending on the determined byte number of thePADL 430. - Specifically, if the total bit number of the
baseband frame 400 is Kbch, the total byte number becomes Kbch/8, and the maximum byte number of thedata field 440 becomes Kbch/8-5, where 5 represents two bytes of theBBHeader 310 and three bytes of theISSY field 420. At this time, since the byte number of thedata field 440 becomes Kbch/8-5, the byte number of thepadding field 450 becomes zero. In other words, since the entire area of thebaseband frame 400 except theBBHeader 410 and theISSY field 420 is thedata field 440, thebaseband frame generator 210 does not insert thepadding field 450 and thePADL 430, and then, may record 00 413-1 in thePADI 413. - Also, if the byte number of the
data field 450 is greater than Kbch/8-5-257 and less than Kbch/8-5, that is, if thepadding field 450 is inserted and the byte number of thepadding field 450 is greater than or equal to one and less than or equal to 256, one byte is sufficient to represent the byte number of thepadding field 450. In this case, thebaseband frame generator 210 sets thePADL 430 as one byte, and then, may record 01 413-2 in thePADI 413. - At this time, the byte number of the
padding field 450, that is, the number of bytes of the padding field, is calculated by subtracting, from Kbch/8 which is the total byte number of thebaseband frame 300, two which is the byte number of theBBHeader 410, three which is the byte number of theISSY field 420, one which is the byte number of thePADL 430, and the byte number of thedata field 440. - On the other hand, if the byte number of the
data field 440 is less than or equal to Kbch/8-5-257, that is, if the byte number of thepadding field 450 is more than 256, at least two bytes are needed to represent the byte number of thepadding field 450. In this case, thebaseband frame generator 210 sets thePADL 430 as two bytes, and then, may record 10 413-3 in thePADI 413. - At this time, the byte number of the
padding field 450 is calculated by subtracting, from Kbch/8 which is the total byte number of thebaseband frame 400, two which is the byte number of theBBHeader 410, three which is the byte number of theISSY field 420, two which is the byte number of thePADL 430, and the byte number of thedata field 440. - The
baseband frame generator 210 may also record 11 413-4 in thePADI 413 for use in the future, if necessary. - If the set value of the
ISSYI 412 is zero, thebaseband frame generator 210 does not insert theISSY field 420 within thebaseband frame 400. Accordingly, if the set value of theISSYI 412 is zero, thebaseband frame generator 210 may generate the baseband frame in the same manner as described inFIG. 3 . - Referring to
FIG. 5 , abaseband frame 500 may include aBBHeader 510, adata field 520, apadding field 530 and aPADL 540. - Then, the
BBHeader 510 may include aSYNCD field 511, aPADI 512 and anRFU field 513. TheSYNCD field 511 stores a bit distance from a starting point of thedata field 520 to an UP field that is first transferred after the starting point as described above, and theRFU field 513 is a field that is left to be used in the future. - The
PADI 512 may include one of a first value defining absence of the PADL, a second value indicating that the PADL is one byte, and a third value indicating that the PADL is two bytes. - In order to generate the
baseband frame 500 as illustrated inFIG. 5 , thebaseband frame generator 210 adds thepadding field 530 based on the byte number of thedata field 520, sets the byte number of thePADL 540 depending on the byte number of the addedpadding field 530, and may record information about the set byte number of thePADL 540 in a bit unit, namely, 00 512-1, 01 512-2, 10 512-3 and 11 512-4 in thePADI 512. - This is the same as the method in which the
baseband frame generator 210 generates thebaseband frame 300 as illustrated inFIG. 3 . - However, the
baseband frame 500 as illustrated inFIG. 5 has a structural difference in that thePADL 540 is added behind thepadding field 530. Due to this structural difference, there may be a difference in the order to generate or read the baseband frame. However, insertion of the PADI indicating the presence or absence of the PADL and the byte number of the PADL, indicating the byte number of the padding field, is the same. - Referring to
FIG. 6 , abaseband frame 600 may include aBBHeader 610, anISSY field 620, adata field 630, apadding field 640 and aPADL 650. - The
BBHeader 610 may include aSYNCD field 611, anISSYI 612, and aPADI 613. In other words, if theISSY field 620 is added to thebaseband frame 600, thebaseband frame generator 210 may add theISSYI 612 indicating presence or absence of theISSY field 620 to theBBHeader 610. - Specifically, in order to generate the
baseband frame 600 as illustrated inFIG. 6 , thebaseband frame generator 210 adds thepadding field 640 based on the byte number of thedata field 630, sets the byte number of thePADL 650 depending on the byte number of the addedpadding field 640, and may record information about the set byte number of thePADL 650 in a bit unit, namely, 00 613-1, 01 613-2, 10 613-3, and 11 613-4 in thePADI 613. - If the set value of the
ISSYI 612 is one, the byte number of thepadding field 640 is calculated by considering that theISSY field 620 is inserted in thebaseband frame 600. If the set value of theISSYI 612 is zero, the byte number of thepadding field 640 is calculated by considering that theISSY field 620 is not inserted in thebaseband frame 600. - This is the same as the method in which the
baseband frame generator 210 generates thebaseband frame 400 as illustrated inFIG. 4 . - However, the
baseband frame 600 as illustrated inFIG. 6 has a structural difference in that thePADL 650 is added behind thepadding field 640. Due to this structural difference, there may be a difference in the order to generate or read the baseband frame. However, insertion of the PADI indicating the presence or absence if the PADL and the byte number of the PADL, indicating the byte number of the padding field, is the same. - According to
FIG. 7 , if the byte number of apadding field 730 is less than or equal to a predetermined size, thebaseband frame generator 210 inserts onePADL 731 indicating the total byte number of thepadding field 730 within thepadding field 730, and if the byte number of thepadding field 730 is greater than the predetermined size, thebaseband frame generator 210 inserts afirst PADL 731 and asecond PADL 732 within thepadding field 730. Thefirst PADL 731 may indicate the presence of thesecond PADL 732 within thepadding field 730, and thesecond PADL 732 may indicate the total byte number of thepadding field 730. - The
baseband frame 700 may include aBBHeader 710, adata field 720 and thepadding field 730 including thefirst PADL 731 and thesecond PADL 732. - Then, the
BBHeader 710 may include aSYNCD field 711, aPADI 712 and anRFU field 713. TheSYNCD field 711 stores a bit distance from a starting point of thedata field 720 to an UP field that is first transferred after the starting point as described above, and theRFU field 713 is a field that is left to be used in the future. - The
PADI 712 may include a first value defining a case that thepadding field 730 does not exist or a second value defining a case that thepadding field 730 exists. - If the
baseband frame 700 includes only theBBHeader 710 and thedata field 720, and thepadding field 730 is not inserted, thebaseband frame generator 210 is not necessary to insert any of thefirst PADL 731 andsecond PADL 732 to indicate the byte number of the padding field. Therefore, thebaseband frame generator 210 records zero as the first value 712-1 in thePADI 712 within theBBHeader 710, and the 0, the first value 712-1, indicates that thepadding field 730 is not inserted within thebaseband frame 700. - Here, the
padding field 730 includes thefirst PADL 731 andsecond PADL 732 differently fromFIGS. 3, 4, 5 and 6 . In other words, if the byte number of thepadding field 730 is 256, thepadding field 730 includes 255 bytes of padding and one byte of thefirst PADL 731. If the byte number of thepadding field 730 is 356 which is greater than 256, thepadding field 730 may include the inserted padding of 353 bytes, thefirst PADL 731 of one byte, and thesecond PADL 732 of two bytes. - Here, if the total byte number of the
padding field 730 is more than 256, thebaseband frame generator 210 inserts thefirst PADL 731 and thesecond PADL 732 in thepadding field 730. Thefirst PADL 731 is set to a value expressed by one byte or less, and thesecond PADL 732 may be inserted in a position corresponding to the set value of thefirst PADL 731 with a size of two bytes. - In other words, the
first PADL 731 may be set to one of 256 values expressed by one byte or less. For example, if the set value of thefirst PADL 731 is 255, thesecond PADL 732 exists in the 255th and 256th bytes from the byte at which thefirst PADL 731 is located. - The structure of the
baseband frame 700 is the same as that of the baseband frame in the above embodiments in that, when thebaseband frame 700 includes theBBHeader 710, thedata field 720 and thepadding field 730, thebaseband frame generator 210 may insert the PADL indicating the byte number of thepadding field 730. - Specifically, if the total bit number of the
baseband frame 700 is Kbch, the total byte number becomes Kbch/8, and the maximum byte number of thedata field 720 is Kbch/8-2, where 2 represents two bytes allocated for theBBHeader 710. At this time, since the byte number of thedata field 720 becomes Kbch/8-2, the byte number of thepadding field 730 is zero. In other words, since the entire area of thebaseband frame 700 except an area for theBBHeader 710 is thedata field 720, thebaseband frame generator 210 does not insert thepadding field 730, thefirst PADL 731 andsecond PADL 732, and then, may record 0 712-1 in thePADI 712. - Also, if the byte number of the
data field 720 is greater than Kbch/8-2-256 and less than Kbch/8-2, that is, if thepadding field 730 is inserted and the byte number of thepadding field 730 is greater than or equal to one and less than or equal to 256, thebaseband frame generator 210 may insert thefirst PADL 731 of one byte within thepadding field 730 in order to indicate the byte number of thepadding field 730, andrecord 1 712-2 indicating that thepadding field 730 has been inserted in thePADI 712. - Here, as described above, if the byte number of the
padding field 730 is 256, thepadding field 730 includes 255 bytes of padding and one byte of thefirst PADL 731. The reason that 256 instead of 257 is subtracted from Kbch/8-2 in calculating the minimum byte number of thedata field 720 is because the firstpadding length field 731 is inserted within thepadding field 730. - At this time, the byte number of the
padding field 730 is calculated by subtracting, from Kbch/8 which is the total byte number of thebaseband frame 700, two which is the byte number of theBBHeader 710 and the byte number of thedata field 720. - On the other hand, if the byte number of the
data field 720 is less than or equal to Kbch/8-2-256, namely, when the byte number of thepadding field 730 is greater than 256, thebaseband frame generator 210 may insert thesecond PADL 732 of two bytes within thepadding field 730 in order to indicate the byte number of thepadding field 730. In this case, thebaseband frame generator 210 may also insert thefirst PADL 731 indicating the presence of thesecond PADL 732 within thepadding field 730, andrecord 1 712-2 indicating that thepadding field 730 has been inserted in thePADI 712. - Here, a starting point of the
second PADL 732 is a place in which the 256th byte from the end of thebaseband frame 700, where thefirst PADL 731 is inserted, is located. Thefirst PADL 731 may store information indicating the presence of thesecond PADL 732 as described above by setting and storing a specific value (e.g. 255). - Also, as described above, if the byte number of the
padding field 730 is 356 which is greater than 256, thepadding field 730 may include the inserted padding of 353 bytes, thefirst PADL 731 of one byte, and thesecond PADL 732 of two bytes. - Further, as in the case that the byte number of the
padding field 730 is greater than or equal to one and less than or equal to 256, the byte number of thepadding field 730 is calculated by subtracting from Kbch/8 which is the total byte number of thebaseband frame 700, two which is the byte number of theBBHeader 710 and the byte number of thedata field 720. - Referring to
FIG. 8 , abaseband frame 800 may include aBBHeader 810, anISSY field 820, adata field 830 and apadding field 840. - The
BBHeader 810 may include aSYNCD field 811, anISSYI 812, aPADI 813 and anRFU field 814. In other words, if theISSY field 820 is added to thebaseband frame 800, thebaseband frame generator 210 may add theISSYI 812 indicating the presence or absence of theISSY field 820 to theBBHeader 810. - However, if the byte number of the
padding field 840 is less than or equal to a predetermined size, thebaseband frame generator 210 adds aPADL 841 indicating the byte number of thepadding field 840 in thebaseband frame 800, and if the byte number of thepadding field 840 is greater than the predetermined size, thebaseband frame generator 210 may add asecond PADL 842 indicating the byte number of thepadding field 840 and afirst PADL 841 indicating the presence of thesecond PADL 842 in thebaseband frame 800. - If the set value of the
ISSYI 812 is one, the byte number of thepadding field 840 is calculated by considering that theISSY field 820 has been inserted in thebaseband frame 800. If the set value of theISSYI 812 is zero, the byte number of thepadding field 840 is calculated by considering that theISSY field 820 is not inserted in thebaseband frame 800. - In other words, if the set value of the
ISSYI 812 is zero, the byte number of thepadding field 840 may be calculated in the same manner asFIG. 7 . If, however, the set value of theISSYI 812 is one and the set value of thePADI 813 is zero, thepadding field 840 does not exist so that the byte number of thedata field 830 is calculated by subtracting from the Kbch/8 which is the total byte number of the baseband frame, two which is the byte number of the BBHeader and three which is the byte number of the ISSY field. - Also, if the set value of the
ISSYI 812 is one and the set value of thePADI 813 is one, and if the byte number of thedata field 830 is greater than Kbch/8-5-256 and less than Kbch/8-5, that is, if thepadding field 840 is inserted and the byte number of thepadding field 840 is greater than or equal to one and less than or equal to 256, thebaseband frame generator 210 may insert afirst PADL 841 of one byte within thepadding field 840 in order to indicate the byte number of thepadding field 840, andrecord 1 813-2 indicating that thepadding field 840 has been inserted in thePADI 813. - Also, as described above, if the byte number of the
padding field 840 is 256, thepadding field 840 includes 255 bytes of padding and one byte of thefirst PADL 841. The reason that 256 not 257 is subtracted in Kbch/8-2 in calculating the minimum byte number of thedata field 830 is because thefirst PADL 841 is inserted within thepadding field 840. - Further, if the set value of the
ISSYI 812 is one and the set value of thePADI 813 is one, and if the byte number of thedata field 830 is less than or equal to Kbch/8-5-256, that is, if the byte number of thepadding field 840 is more than 256, thebaseband frame generator 210 may insert asecond PADL 842 of two bytes within thepadding field 840 in order to indicate the byte number of thepadding field 840. In this case, thebaseband frame generator 210 may also insert thefirst PADL 841 indicating the presence of thesecond PADL 842 within thepadding field 840, andrecord 1 813-2 indicating that thepadding field 840 has been inserted in thePADI 813. - Also, as described above, if the byte number of the
padding field 840 is 356 which is greater than 256, thepadding field 840 may include the inserted padding of 353 bytes, thefirst PADL 841 of one byte, and thesecond PADL 842 of two bytes. - Here, if the total byte number of the
padding field 840 is greater than 256, thebaseband frame generator 210 inserts thefirst PADL 841 andsecond PADL 842 in thepadding field 840. Thefirst PADL 841 is set to a value expressed by one byte or less, and thesecond PADL 842 may be inserted in a position corresponding to the set value of thefirst PADL 841 with a size of two bytes. - However, if the byte number of the
padding field 840 is greater than or equal to one and less than or equal to 256 or more than 256, that is, only if there is any padding greater than or equal to one, the byte number of thepadding field 840 is calculated by subtracting, from the Kbch/8 which is the total byte number of thebaseband frame 800, two which is the byte number of theBBHeader 810, three which is the byte number of theISSY field 820, and the byte number of thedata field 830. -
FIGS. 9A and 9B illustrate a table indicating values that are set in a PADI when a padding field of one byte is inserted according to an exemplary embodiment of the present disclosure. - Referring to
FIG. 9A , a PADI may include one of a first value defining the absence of PADL and padding field, a second value indicating that the PADL does not exist and the padding field is one byte, a third value indicating that the PADL is one byte, and a fourth value indicating that the PADL is two bytes. - Here, if the byte number of the padding field is zero, the
baseband frame generator 210 does not insert the padding field and the PADL, and records the first value in the padding indicator field. If the byte number of the padding field is one, thebaseband frame generator 210 does not insert the PADL, and records the second value in the padding indicator field. If the byte number of the padding field is more than 1 and less than or equal to 256, thebaseband frame generator 210 sets the PADL as one byte, and records the third value in the padding indicator field. If the byte number of the padding field is greater than 256, thebaseband frame generator 210 sets the PADL as two bytes, and records the fourth value in the padding indicator field. - If there is no padding field, the
baseband frame generator 210 does not insert the PADL, and may record 00 910 in the PADI. - If the padding field is one byte, the
baseband frame generator 210 does not insert separately the PADL by allowing the PADI to directly indicate that one byte padding field is padded, and may record 01 920 in the padding indicator field. - If the byte number of the padding field is more than one, the
baseband frame generator 210 may set the byte number of the PADL to one or two depending on the byte number of the padding field, andrecord 10 930 or 11 940 in the padding indicator field. - In other words, the exemplary embodiment as illustrated in
FIG. 9A may be applied to all the embodiments of the present disclosure as described above. In other words, in all the embodiments, if the padding field is one byte, the PADI directly indicates that one byte padding field is padded and the PADL is not inserted separately. - Referring to
FIG. 9B , the PADI may include one of a first value defining the absence of PADL and padding field, a second value indicating that the PADL does not exist and the padding field is one byte, and a third value indicating that the PADL is two bytes. - Then, if the byte number of the padding field is zero, the
baseband frame generator 210 does not insert the padding field and the PADL, and may record the first value in the PADI. If the byte number of the padding field is one, thebaseband frame generator 210 does not insert the PADL, and may record the second value in the PADI. If the byte number of the padding field is more than one, thebaseband frame generator 210 sets the PADL as two bytes, and may record the third value in the padding indicator field. - If the there is no padding field, the
baseband frame generator 210 may not insert the PADL, and may record 00 950 in the padding length field. - If the padding field is one byte, the
baseband frame generator 210 may not insert separately the PADL by allowing the PADI to directly indicate that one byte padding field is padded, and may record 01 960 in the PADI. - If the byte number of the padding field is more than one, the
baseband frame generator 210 may fixedly set the byte number of the PADL to two regardless of the byte number of the padding field, andrecord 10 970 in the PADI. - Also, the
baseband frame generator 210 may record 11 980 in the PADI for use in the future. - The exemplary embodiment as illustrated in
FIG. 9B may be applied to all the embodiments of the present disclosure as described above. In other words, in all the embodiments, if the padding field is one byte, the PADL directly indicates that one byte padding field is padded, the PADL is not inserted separately, and, if the byte number of the padding field is more than one, the byte number of the PADL is fixedly set to two. - The method for generating the baseband frame as illustrated in
FIG. 9B has a difference in that the PADL is fixed as two bytes compared with the method for generating the baseband frame as illustrated inFIG. 9A . In other words, in the case of theFIG. 9B , since the PADL is, if necessary, fixed as two bytes to indicate the byte number of the padding field, the baseband frame may have a relatively simple structure compared withFIG. 9A . - In order to apply the method for generating the baseband frame as illustrated in
FIG. 9B to the embodiments as illustrated inFIGS. 7 and 8 , thebaseband frame generator 210 assigns the last two bytes of the baseband frame to the PADL, and may store therein information indicating the length of the padding field which is subtracted, from Kbch/8 which is the total byte number of the baseband frame, the byte number of the BBHeader or the sum of the byte number of the BBHeader and the byte number of the ISSY field, and the byte number of the data field. - The
baseband frame generator 210 may generate a baseband frame in the order of a baseband header, a PADL, a padding field, and a data field. In this case, the padding field may include the PADL, and thus, one or two bytes of the bytes of the padding field may be assigned to the PADL. Then, the baseband frame generated in such manner may be applied to all the embodiments of the present disclosure as described above. -
FIG. 10 is a block diagram illustrating a receiving process of a receiver using a DVB-T2 method. - A
receiver 1000 includes a DVB-T2 RF module 1010, a DVB-T2 BB module 1020, anaccelerator 1030, aframe processor 1040, ademultiplexer 1050, and an audio/video decoder 1060. - The DVB-
T2 RF module 1010 may receive transmitted signals of the DVB-T2 standard. - If receiving the transmitted signals from the DVB-
T2 RF module 1010, the DVB-T2 BB module 1020 starts to operate, and may perform baseband signal processes (synchronization, channel estimation, equalization, deinterleaving, etc.). - The
accelerator 1030 performs LDPC and BCH decoding for the DVB-T2, and, in addition, may perform fast Fourier transform (FFT) for the DVB-T2. - The
frame processor 1040 may process a data area by using header information of the baseband frame of the DVB-T2. - The
demultiplexer 1050 may regenerate signals such as TS, GCS, GFPS, GSE, etc. received from a transmitter by performing reverse processes of a stream adaptation module and a mode adaptation module. - The audio/
video decoder 1060 may play back audio/video signals from the signals such as TS, GCS, GFPS, GSE, etc. -
FIG. 11 is a block diagram illustrating a configuration of a receiver according to an exemplary embodiment of the present disclosure. - The
receiver 1100 includes areceiving unit 1110, acontroller 1120 and aprocessing unit 1130. - The receiving
unit 1110 may receive a transmission stream including a baseband frame like the DVB-T2 RF module 1010 as illustrated inFIG. 10 . - The
controller 1120 may calculate a size of the data field of the baseband frame. - In detail, the
controller 1120 may perform functions which are performed by the DVB-T2 BB module 1020, theaccelerator 1030 and theframe processor 1040 as illustrated inFIG. 10 . In other words, thecontroller 1120 may perform baseband signal processes by performing synchronization, channel estimation, equalization, deinterleaving, etc. from the received transmission stream, and then, may detect a baseband frame by performing the LDPC and BCH decoding. Also, thecontroller 1120 may perform a function to process the data area by using the header information of the baseband frame. - The baseband frame may include a baseband header, a data field, a padding field, and a PADL indicating the byte number of the padding field. The BBHeader includes a PADI indicating information about the PADL.
- Accordingly, the
controller 1120 may detect information about the PADL based on the padding indicator field, calculate the byte number of the padding field based on the detected information, and calculate the byte number of the data field based on the byte number of the baseband header, the byte number of the PADL, and the byte number of the padding field. - Also, if the baseband frame further includes an ISSY field, the
controller 1120 may calculate the byte number of the data field based on the byte number of the baseband header, the byte number of the PADL, the byte number of the ISSY field and the byte number of the padding field. - Then, the
processing unit 1130 may process a plurality of data streams mapped in the data field of the baseband frame. In other words, theprocessing unit 1130 may regenerate signals such as TS, GCS, GFPS, GSE, etc. received from a transmitter by performing reverse processes of a stream adaptation module and a mode adaptation module like thedemultiplexer 1050 as illustrated inFIG. 10 . -
FIG. 12 is a flowchart for explaining a stream generating method of a transmitter according to an exemplary embodiment of the present disclosure. - According to a method as illustrated in
FIG. 12 , a baseband frame including a baseband header, a data field and a padding field may be generated (S1210). - Then, a plurality of data streams may be mapped in the data field (S1220). Here, the baseband frame may include a PADL indicating the byte number of the padding field, and the BBHeader may include a PADI indicating information for the PADL.
- In detail, a transmitter may add the padding field based on the byte number of the data field, set the byte number of the PADL depending on the byte number of the added padding field, and indicate information for the set byte number of the PADL in the PADI in a bit unit.
- Here, the PADI may include one of a first value defining the absence of the PADL, a second value indicating that the PADL is one byte, and a third value indicating that the PADL is two bytes.
- In detail, if the byte number of the padding field is zero, the padding field and the PADL may not be inserted, and the first value may be recorded in the PADI. If the byte number of the padding field is more than or equal to one and less than or equal to 256, the PADL may be set as one byte, and the second value may be recorded in the PADI. If the byte number of the padding field is greater than 256, the PADL may be set as two bytes, and the third value may be recorded in the PADI.
- Also, if an ISSY field is added to the baseband frame, an ISSYI indicating the presence or absence of the ISSY field may be added to the baseband header.
- On the other hand, if the byte number of the padding field is less than or equal to a predetermined size, one PADL indicating the total byte number of the padding field may be inserted within the padding field, and if the byte number of the padding field is more than the predetermined size, a first PADL and a second PADL may be inserted within the padding field. The first PADL may indicate the presence of the second PADL within the padding field, and the second PADL may indicate the total byte number of the padding field.
- Here, the PADI may include a first value defining a case that the padding field does not exist or a second value defining a case that the padding field exists. Also, if the byte number of the padding field is zero, the padding field and the PADL are not inserted, and then, the first value is recorded in the PADI. If the byte number of the padding field is more than or equal to one and less than or equal to 256, the PADL is set as one byte, and then, the second value is recorded in the PADI. If the byte number of the padding field is more than 256, the first and second padding length fields are added to the baseband frame, and the second value may be recorded in the PADI. At this time, the first PADL is one byte, and the second PADL is two bytes.
- Also, if the total byte number of the padding field is greater than 256, the first and second padding length fields are inserted in the padding field, the first PADL is set to a value expressed by one byte or less, and the second PADL may be inserted in a place corresponding to the set value of the first PADL with a size of two bytes.
- Also, if the ISSY field is added to the baseband frame, an ISSYI indicating the presence or absence of the ISSY field may be added to the baseband frame.
- On the other hand, the PADI may include one of a first value defining the absence of PADL and padding field, a second value indicating that the PADL does not exist and the padding field is one byte, a third value indicating that the PADL is one byte, and a fourth value indicating that the PADL is two bytes.
- In this case, if the byte number of the padding field is zero, the padding field and the PADL are not inserted, and then, the first value is recorded in the padding indicator field. If the byte number of the padding field is one, the PADL is not inserted, and then, the second value is recorded in the PADI. If the byte number of the padding field is greater than one and less than or equal to 256, the PADL is set as one byte, and the third value may be recorded in the PADI. If the byte number of the padding field is greater than 256, the PADL is set as two bytes, and then the fourth value may be recorded in the PADI.
- On the other hand, the PADI may include one of a first value defining the absence of PADL and padding field, a second value indicating that the PADL does not exist and the padding field is one byte, and a third value indicating that the PADL is two bytes.
- In this case, if the byte number of the padding field is zero, the padding field and the PADL are not inserted, and then, the first value is recorded in the PADI. If the byte number of the padding field is one, the PADL is not inserted, and then, the second value is recorded in the PADI. If the byte number of the padding field is greater than one, the PADL is set as two bytes, and the third value may be recorded in the PADI.
-
FIG. 13 is a flowchart for explaining a control method of a receiver according to an embodiment of the present disclosure. - According to a method as illustrated in
FIG. 13 , a transmission stream including a baseband frame may be received (S1310). - Then, a size of a data field of the baseband frame may be calculated (S1320). Here, information about a PADL may be detected based on the PADI, the byte number of the padding field may be calculated based on the detected information, and the byte number of the data field may be calculated based on the byte number of the baseband header, the byte number of the PADL, and the byte number of the padding field.
- Also, when the baseband frame further includes an ISSY field, the BBHeader further includes an ISSYI indicating the presence or absence of the ISSY field, and the byte number of the data field may be calculated based on the byte number of the baseband header, the byte number of the PADL, the byte number of the ISSY field, and the byte number of the padding field.
- Next, a plurality of data streams mapped in the data field of the baseband frame may be processed (S1330).
- According to an exemplary embodiment, a non-transitory computer-readable medium in which a program performing sequentially the control method according to the embodiment of the present disclosure is stored may be provided.
- For example, a non-transitory computer-readable medium in which a program performing a step of generating a baseband frame including a baseband header, a data field, and a padding field, a step of mapping a plurality of data streams to the data field, and a step of generating a transmission stream including the baseband frame is stored may be provided.
- Also, for example, a non-transitory computer-readable medium in which a program performing a step of calculating a size of the data field of the baseband frame, and a step of processing the plurality of data streams mapped to the data field of the baseband frame is stored may be provided.
- Contrary to a medium to store data for a short moment, such as a register, a cache, a memory, etc., the non-transitory computer-readable medium refers to a medium that can store data in a semi-permanent manner and that can be read by devices. In detail, the above-described various applications or programs may be stored in and provided with the non-transitory computer readable medium such as a compact disc (CD), a digital versatile disc (DVD), a hard disc, a Blu-ray disc, an universal serial bus (USB), a memory card, a read-only memory (ROM), etc.
- Also, in
FIGS. 2 and 11 that illustrate thetransmitter 200 and thereceiver 1100, respectively, a bus is not illustrated, but communication between components of each of the transmitter and the receiver may be performed through a bus. Also, each component may include a processor to perform various steps as described above, such as a central processing unit (CPU), a microprocessor, etc. - Further, each of the components of the
transmitter 200 and thereceiver 1100 may be embodied as functional block structures and various processing operations. These functional blocks may be embodied as the various numbers of hardware and/or software structures that execute particular functions. For example, each component may use a direct circuit structure, such as a memory, processing, logic, a look-up table, etc. that may execute various functions through controls of one or more microprocessors or other control apparatuses. - While the embodiments of the present disclosure have been described, additional variations and modifications of the embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims shall be construed to include both the above embodiments and all such variations and modifications that fall within the spirit and scope of the inventive concepts.
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CN105745932B (en) * | 2013-11-13 | 2021-02-02 | Lg电子株式会社 | Apparatus for transmitting broadcast signal and method for transmitting broadcast signal |
KR101765022B1 (en) | 2013-11-13 | 2017-08-03 | 엘지전자 주식회사 | Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals |
WO2015122622A1 (en) * | 2014-02-13 | 2015-08-20 | Lg Electronics Inc. | Method and apparatus for transmitting and receiving broadcast signal |
WO2016072567A1 (en) * | 2014-11-06 | 2016-05-12 | 엘지전자(주) | Method and apparatus for receiving broadcast signal, and method and apparatus for transmitting broadcast signal |
US10992591B1 (en) * | 2019-03-12 | 2021-04-27 | Juniper Networks, Inc | Apparatus, system, and method for discovering path maximum transmission units |
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CN105359535B (en) | 2019-12-10 |
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WO2014208988A1 (en) | 2014-12-31 |
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