KR101363847B1 - Psip-table structure and control device for storing psip-table in digital broadcasting receiver - Google Patents

Abstract

The present invention provides a PSIP table structure for digital broadcast receivers that can facilitate data processing of an EIT (Event Information Table) section and an ETT (Extended Text Table) section utilized as EPG (Electronic Program Guide) information among PSIPs, and their storage control. In the present invention, for this purpose, an instance index information field is added to a header portion of an EIT and an ETT, so that it is possible to distinguish between corresponding instances having the same version number.

PSIP, EPG, EIT, ETT, Instance

Description

PSIP table structure for digital broadcast receiver and its storage control device {PSIP-TABLE STRUCTURE AND CONTROL DEVICE FOR STORING PSIP-TABLE IN DIGITAL BROADCASTING RECEIVER}

The present invention relates to a PSIP (Program and System Information Protocol) table structure for a digital broadcast receiver, and more particularly, to the EIT (Event Information Table) section and the ETT (Extended Text Table) section utilized as EPG (Electronic Program Guide) information in the PSIP. A PSIP table structure for a digital broadcast receiver capable of facilitating data processing and a storage control device thereof.

In general, PSIP (Program and System Information Protocol) is a protocol used to transmit information and broadcast schedules for each channel of a transport stream multiplexed in the ATSC digital broadcasting standard.

PSIP defines EPG (Electronic Program Guide) information such as virtual channel and broadcasting program title, plot, and rating information according to the contents of video contents.

The PSIP is a collection of tables having the same purpose, and each of the tables can be transmitted by being divided into sections. Tables defined in the PSIP standard include a system time table (STT), a master guide table (MGT), a virtual channel table (VCT), a rating region table (RTT), an event information table (ETT), and an extended text table (ETT). Etc.

That is, the PSIP is composed of a plurality of tables, and each table is composed of a plurality of sections. Each section includes a header portion having basic information on actual data included in the section, a body portion on which the actual data is loaded, and a trailer portion for displaying the end of the data and summarizing the contents. Can be divided into

In general, the contents of the section can be known by decoding only the header part having basic information about the actual data.

However, there is a case where the specific information of the section cannot be known only by the information of the header part, so that a body part having actual data needs to be decoded.

For example, in the EIT table defined in the PSIP standard, as shown in FIG. 1A, there is no information for distinguishing EIT instances (EIT-0, EIT-1, EIT-2, ..., EIT-n). .

Similarly, the ETT table defined in the PSIP standard has no information for distinguishing the ETT instances (ETT-0, ETT-1, ..., ETT-n) as shown in FIG. 1B.

In the existing software implementation for processing PSIP event data, in order to distinguish between EIT or ETT instances, a PID included in a transport stream is extracted through a transport packet parser supported by an MPEG2 decoder, and the extracted PID and Compared to the PID extracted from the table_type_PID field (underlined) in the body portion of the MGT (Master Guide Table) table as shown in FIG. 2, there was a need to distinguish a specific EIT or ETT instance.

If the user wants to store only the specific EIT and ETT table instead of storing all the transmitted EIT and ETT tables, the instances of the EIT or ETT table included in the transport stream should be distinguished.

Accordingly, in order to distinguish between the instances of the EIT or the ETT table, the transport stream is parsed to extract the PID and the PID is extracted by comparing the extracted PID with the PID extracted from the table_type_PID field of the MGT (Master Guide Table) table. Due to the parsing of the stream and decoding up to the body part of the MGT table, there is a problem that takes a lot of time. As a result, an overload occurs in a system such as a PSIP decoder, which causes a problem of deteriorating system efficiency.

An object of the present invention is to add the index information field for distinguishing the instances of the table to the EIT or ETT table PSPS table structure and storage control of the digital broadcast receiver that can easily distinguish between the specific EIT and ETT instance To provide a device.

Another object of the present invention is to add an index information field for distinguishing instances of the table to the EIT or ETT table to easily select and store a specific EIT and ETT table of the transmitted EIT and ETT tables The present invention provides a PSIP table structure and a storage control device of a broadcast receiver.

The PSIP table structure for a digital broadcast receiver according to the present invention for achieving the above object includes an event information table (EIT) in which a broadcast program title and guide data of a transport stream are stored, and detailed information on a virtual channel and a broadcast program. In Program and System Information Protocol (PSIP) including Extended Text Table (PSIP), an instance index information field is added to the header portion of the EIT and the ETT to distinguish the corresponding instances from the same version number. It is configured to be possible.

Specifically, the header of the EIT and ETT starts with a table_id field, the index information field is added to the rear of the table_id field, and the instance index information field is assigned with 8 bits.

The storage control apparatus of the PSIP table of the present invention for achieving the above object, the demultiplexer for separating the audio and video and PSIP (Program and System Information Protocol) table from the input transport stream, respectively; A storage unit in which index information for event information table (EIT) and extended text table (ETT) instances to be stored are preset; And receiving the PSIP table output through the demultiplexer, checking the instance index information field located in each header portion of the EIT and the ETT in the PSIP table, and confirming the index information of the EIT and the ETT. And a PSIP processing unit which determines whether to store EIT and ETT data by comparing and determining whether the index information belongs to the index information stored in the storage information.

Specifically, the PSIP processor reads and stores all the data of the message body of the EIT and ETT when the index information identified in the EIT and the ETT is included in the index information stored in the storage unit, but the version number of the EIT and the ETT. If EIT and ETT data equal to (version_number) is pre-stored in the storage unit, the EIT and ETT are discarded.

The PSIP processor may discard the EIT and the ETT when the identified index information is not included in the index information stored in the storage unit.

As described above, the present invention has an advantage of facilitating the distinction between a specific EIT and an ETT instance by adding an index information field for distinguishing instances of the table to the EIT or ETT table.

In addition, by adding an index information field for identifying instances of the table to the EIT or ETT table, it is possible to easily distinguish a specific EIT and ETT table among the transmitted EIT and ETT tables, thereby improving system processing efficiency. As a result, a specific EIT and ETT table can be selected and stored among the EIT and ETT tables, thereby reducing the memory capacity.

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

FIG. 3 is a diagram illustrating a structure of an EIT table according to an embodiment of the present invention, and illustrates that index information for classifying event information table (EIT) instances is added to an EIT_table.

The EIT table contains program title and guide data of a transport stream.

In order to describe the EIT in connection with the present invention, first, a brief description of the PSIP, the PSIP (Program and System Information Protocol) means a broadcast protocol for transmitting channel and broadcast program guide information.

In this case, the PSIP is composed of a set of tables having the same purpose, and each table is divided into sections and transmitted to the broadcast receiver.

The PSIP standard includes a system time table (STT) having information at a current time viewed by a broadcast receiver, a master guide table (MGT) having a pointer to other PSIP tables, and a virtual channel. EIT (Extended Text Table), ETT (Extended Text Table), TVCT (Terrestrial Virtual Channel Table), and CVCT (Virtual Channel Table) that provide information about the Virtual Channel Table (VCT), Electronics Program Guide (EPG) services. Channel Table).

The EIT table contains a schedule of events representing a broadcast program and information on each event. The EIT table includes a section composed of a plurality of fields. The section may include a header portion having basic information on actual data, a message body portion on which the actual data is loaded, and a trailer portion for error checking and correction of the corresponding table. have.

In FIG. 3, the header part is from a table_id field to an EIT_index field, the message body part is a descriptors_length field in a num_events_in_section field, and the trailer part is a CRC_32 field.

Therefore, the instance index information (EIT_index) field of the EIT table according to the present invention is added to the header part, and a total of 128 instances (EIT-0, EIT-1) are allocated by allocating 8 bits for distinguishing the EIT instances. , ..., EIT-127) can be distinguished.

In FIG. 3, the instance index information (EIT_index) field is added below the protocol_version field, but may be added at any position of the header part. However, since all table sections are defined to start with the table_id field in the PSIP, it is preferable to add the header after the table_id field.

In the EIT table configured as described above, one EIT table may have 3 hours of event (broadcast program) information as shown in FIG. 4, and instances of the EIT table are given different indexes (EIT_Index) according to time order. Separate. That is, instances of the EIT table are identified by being labeled EIT-0, EIT-1, EIT-2, ..., EIT-127. For example, if the EPG information is only serviced for 24 hours, the instances of the EIT table will be marked and classified only as EIT-0 to EIT-7.

Each EIT table may represent information of one or more events, for example, information of three hours of broadcast programs in one section, that is, message body. Event_id is present in each event to distinguish each event.

As such, in the present invention, the EIT instances (EIT-0, EIT-1, EIT-2, ..., EIT-127) are distinguished from the EIT table defined in the PSIP standard to facilitate processing of the PSIP event data. Index information was added.

Since the total number of instances in the EIT table is 128, it is preferable to allocate 8 bits as the uimsbf (unsigned integer, most significant bit first) type for the instance index information (EIT_Index). For example, it is possible to store 3 hours of event information in one EIT table, so a total of 384 hours (3 hours * 128) of event information (16 days) can be serviced at a time in 128 instances. have. If the calculation is performed except for the time when there is no broadcast, the time for actually serving the event information will be increased.

The range of the index information (EIT_Index) field value can be expressed as 0x0000 to 0x007F, where 0x0000 is mapped to EIT-0, 0x0001 is mapped to EIT-1, and 0x0002 is mapped to EIT-2. The value of 0x007F is mapped to EIT-127.

In addition, all tables defined in the PSIP specification are recognized by the table_id field, and tables of the same type have the same table_id field value, and all tables carried in the transport stream packet have the same PID value and the same version_number value. However, each table instance has a different index value in chronological order.

The method of identifying an EIT instance using the index information EIT_Index can easily identify the EIT instance by reading an instance index information (EIT_Index) field value from the EIT table. Accordingly, PID is extracted by parsing the transport stream to distinguish between instances of the EIT or ETT table, and the serial processes such as comparing the extracted PID with the PID extracted from the table_type_PID field of the MGT (Master Guide Table) table are not performed. Efficient processing becomes possible.

FIG. 5 is a diagram illustrating an ETT table defined in a PSIP standard according to another embodiment of the present invention, and illustrates that index information for distinguishing ETT (Extended Text Table) instances is added to an ETT_table.

The ETT table contains channel information and event detailed information about events representing a broadcast program, and the ETT table is composed of sections consisting of a plurality of fields. The section may include a header portion having basic information on actual data, a message body portion on which the actual data is loaded, and a trailer portion for error checking and correction of the corresponding table. have.

The sections of all tables (STT, MGT, VCT, etc.) defined in the PSIP standard as well as the EIT and ETT start with a table_id field and end with a CRC_32 field, and each table has a header part and a message body. It consists of a body part and a trailer part.

In FIG. 5, the header part is from a table_id field to an ETT_index field, the message body part is an ETM_id field and an extended_text_message field, and the trailer part is a CRC_32 field.

Therefore, the index information (ETT_index) field for the ETT table according to the present invention is added to the header portion and 8 bits are allocated. In FIG. 5, the index information field (ETT_index) is added below the protocol_version field, but may be added at any position of the header portion. However, since all table sections are defined to begin with the table_id field, it is preferable to add the header after the table_id field.

The ETT table shown in FIG. 5 is mapped to each other EIT of FIG. 3. That is, information about events belonging to the EIT-0 is in ETT-0, information about events belonging to the EIT-1 is in ETT-1, and information about events in the EIT-127 is ETT-127 Is written on.

In this case, each EIT may represent information of one or more events in one section. And event_id exists in each event, and distinguishes each said event.

As shown in FIG. 6, one ETT table may have three hours of event detailed information corresponding to the EIT table, and instances of the ETT table may be distinguished by giving different indexes according to time order. That is, instances of the ETT table are identified by being labeled ETT-0, ETT-1, ETT-2, ..., ETT-127. For example, suppose that only 24 hours of EPG information is serviced, an instance of the ETT table will be marked and classified only as ETT-0 to ETT-7.

As described above, in the present invention, the ETT instances (ETT-0, ETT-1, ETT-2, ..., ETT-127) are distinguished from the ETT table defined in the PSIP standard to facilitate the processing of the PSIP event data. Index information was added.

Since the total number of instances of the ETT table is 128, 8 bits are allocated as uimsbf (unsigned integer, most significant bit first) type for instance index information (ETT_Index).

The method for identifying an ETT instance using the instance index information (ETT_Index) can easily identify the ETT instance by reading the ETT_Index field value from the ETT table.

The range of the index information (ETT_Index) field value can be expressed as 0x0000 to 0x007F, where 0x0000 is mapped to ETT-0, 0x0001 is mapped to ETT-1, and 0x0002 is mapped to ETT-2. ..., 0x007F value will be mapped to ETT-127.

Meanwhile, as an example, the information of each corresponding field constituting the section of the ETT will be briefly described. English expressions of the above fields are used as they are, but double quotation marks are used together.

The section of the ETT table of FIG. 5 is composed of a header, a message body, and a trailer. First, the header part will be described.

"table_id" is an 8-bit field and defines a PSIP table belonging to the section. Tables generated in the ATSC standard and other tables defined in the PSIP standard should be considered private. Therefore, the table_id field indicates that the table is an ETT.

"section_syntax_indicator" is a 1-bit field and is always set to 1 to indicate the "long" format of the private_section table of the MPEG-2 system.

"private_indicator" is a 1-bit field and will be set to 1.

"reserved" is a 2-bit field and is unused for future use.

"section_length" is a 12-bit field, which defines the number of bytes remaining in the private section and may be set smaller than 4093.

"ETT table_id_extension" is a 16-bit field and is set differently for each ETT instance of each table.

"version_number" allocates 5 bits for channel ETT, and the 5 bits indicate a version number of channel ETT. In addition, 5 bits are allocated for the event ETT, and the 5 bits indicate the version number of the event ETT-i. In this case, i is associated with the EIT as an index in chronological order. This version_number field value is used for deduplication.

"current_next_indicator" is a 1-bit indicator that is always set to 1 for the ETT section.

"section_number" is an 8-bit field value and always has a value of 0x00.

"last_section_number" is an 8-bit field value and always has a value of 0x00.

"protocol_version" is an 8-bit undefined integer field that will be used if the protocol version changes. The table type performs parameters configured differently than defined in the current protocol.

"ETT_index" is an 8-bit field value indicating index information of ETT instances. The ETT instances are distinguished from each other by being given different index information (ETT_index) in time order and have values of 0x0000 to 0x007F. At this time, the 0x0000 value is mapped to ETT-0, the 0x0001 value is mapped to ETT-1, the 0x0002 value is mapped to ETT-2, and the 0x007F value is mapped to ETT-127.

Next, look at the message body portion.

"ETM_id" is an identifier of different 32 bits of Extended Text Message (ETM). When the identifier is channel_ETM_id, source_id is present in the most significant bit MSB and the least significant two bits LSB are allocated as '00'. In the case of event_ETM_id, source_id exists in the most significant bit, event_id exists in bit 15, and the two least significant bits are set to '10'.

"extended_text_message ()" is an extended detail text message in the format of a multiple string structure.

Finally, we look at the trailer portion.

The " CRC_32 " is a 32-bit field value and includes a CRC value that guarantees zero output from a register in a decoder defined in the MPEG-2 system after processing the entire transport stream ETT section.

As described above, the present invention adds the instance index information (EIT_index, ETT_index) field to the header portion of the EIT or ETT table included in the transport stream and transmits the EIT or ETT table transmitted to the transport stream in the broadcast receiver. To identify instances of, you only need to check the index information field added to the header of each table.

Accordingly, software implementation and efficiency are improved by processing the PSIP event data by checking only the index information field added to the header portion of each EIT or ETT table.

For example, when a broadcast receiver wants to store only specific EIT and ETT instances among a plurality of received EIT and ETT instances, the broadcast receiver only needs to check the index information field added to the header of each table. There is no need for parsing, which increases the efficiency of the system.

7 is a diagram illustrating a PSIP table storage control apparatus for a digital broadcast receiver according to an embodiment of the present invention, in which a tuner 110, a demodulator 115, a demultiplexer 120, a PSIP processor 130, and an EPG storage are stored. The unit 140 includes a microprocessor 150, an OSD signal processor 160, a video processor 190, and the like.

The digital broadcast receiver configured as described above receives and processes a transport stream including PSIP tables and audio / video packets. Hereinafter, the PSIP table will be described with limited focus on the EIT and ETT tables related to the present invention.

The tuner 110 is responsible for tuning and receiving the transmitted digital broadcast signal. In this case, the digital broadcast signal includes program and system information protocol (PSIP) information including EIT and ETT in accordance with the present invention.

The demodulator 115 is responsible for demodulating the tuned signal into a VSB / EVSB (Vestigal Side Band / Enhanced Vestigal Side Band) signal.

The demultiplexer 120 performs a function of demultiplexing and separating audio, video, and PSIP information from the demodulated and received transport stream packets. In this case, the demultiplexing of the PSIP information may be controlled by the PSIP processing unit 130.

The PSIP processing unit 130 parses the headers of the EIT and ETT tables among the PSIP tables transmitted from the demultiplexer 120 to check instance index information, respectively, and then belongs to the instance index information preset in the EPG storage 140. In this case, all the data of the message body of the corresponding section is read and stored in the EPG storage unit 140.

The EPG storage unit 140 stores index information for EIT and ETT instances to be stored in advance, and stores broadcast program guide information (EPG) for each broadcasting channel and time under the management of the PSIP processing unit 130.

In addition, the PSIP processing unit 130 checks the header portion of each table transmitted from the demultiplexer 120, and the PID, table ID (table_id), version number (version_number), and section number (header) of the header portion. section_number), etc. to properly process each table. For example, the PSIP processing unit 130 examines a version number field located in the header portion of the EIT and the ETT and discards the corresponding table when the version number is the same as the program guide information stored in the EPG storage unit 140. (discard), and if the version number of the EIT and ETT fields is different from the version number of the program guide information stored in the EPG storage unit 140, all the data of the message body of the corresponding section of the received EIT and ETT table It is read and stored in the EPG storage unit 140.

The microprocessor 150 controls the tuner 110 and the PSIP processing unit 130 according to a command input through a remote control receiver or a graphical user interface (GUI) to respond to the viewer's EPG display command and channel request. In addition, when the EPG display command is input, the microprocessor 150 receives the program guide information stored in the EPG storage unit 140 and outputs it to the OSD signal processing unit 160.

The OSD signal processor 160 is configured to generate and output OSD screen data by processing broadcast program guide information imaged by the microprocessor 150 as an OSD (On Screen Display) signal.

Meanwhile, the broadcast receiver includes an audio decoder 170 and a video decoder 180 for decoding audio / video data separated by the demultiplexer 120, and video data or an OSD decoded by the video decoder 180. The apparatus further includes a video processor 190 for selectively or individually overlaying OSD screen data output from the signal processor 160 and outputting the OSD screen data to an external display panel.

Looking at the operation of the broadcast receiver configured as described above, first, in the present invention, the EIT and ETT instances to be stored in the EPG storage unit 140 are set in advance. That is, the EIT and ETT instances to be stored are previously set regardless of the received EIT and ETT instances. The memory capacity of the EPG storage unit 140 may be small or arbitrarily set by a user's request.

In such a state, when the PSIP table is input through the demultiplexer 120, the PSIP processing unit 130 parses the header parts of the EIT and ETT tables of the input table, respectively, and parses the EIT index information field and the ETT index information field. Inspect each.

If a broadcasting station transmits three days of program guide information for each channel at a time, three hours of event information is stored in one EIT table. Thus, the EIT instances are EIT-0 to EIT-23 in chronological order. Will exist and ETT instances will also exist from ETT-0 to ETT-23.

Subsequently, the PSIP processing unit 130 compares the instance index information recorded in the EIT index information field and the ETT index information field checked above with the instance index information stored in the EPG storage unit 140 and according to the comparison result. You decide whether to process and store the data. For example, when the EIT instance to be stored in the EPG storage unit 140 is set to EIT-0 to EIT-7, and the ETT instance is also set to ETT-0 to ETT-7, EIT-8 to EIT-23. The instances up to and the instances up to ETT-8 to ETT-23 are discarded without being stored in the EPG storage unit 140 regardless of reception.

Therefore, when the EIT and ETT instances are the same as the instance index setting information stored in the EPG storage unit 140, all the data of the message body portion of the received EIT and ETT table are read and stored in the EPG storage unit 140. Of course, the version number (version_number) field located in the header portion of the EIT and ETT is examined and if the corresponding version number is the same as the version number of the program guide information stored in the EPG storage unit 140, the corresponding card is discarded. do.

That is, three days of EIT and ETT table information is received at a time, but the PSIP processing unit 130 stores only the corresponding instance according to the instance setting information stored in the EPG storage unit 140. Accordingly, the broadcast station transmits three days of program information, but the broadcast receiver only guides one day of program information.

Although the example of storing only one day's EPG information in the three-day EPG information service is not limited thereto, the EIT and the corresponding EIT may be determined according to the instance setting information of the EPG storage unit 140 regardless of the number of received instances. It only stores the ETT instance.

The foregoing preferred embodiments of the present invention have been disclosed for illustrative purposes, and those skilled in the art will appreciate that various modifications, additions and substitutions are possible within the technical scope of the present invention. Therefore, such modifications, changes and additions should be determined not only by the claims below, but also by equivalents to those claims.

1A and 1B are diagrams illustrating the structures of an EIT table and an ETT table, respectively, in the PSIP table according to the prior art.

2 is a diagram illustrating a structure of a master guide table (MGT) table in a general PSIP table.

3 is a diagram showing the structure of an EIT table according to an embodiment of the present invention.

4 is a diagram illustrating instances of the EIT table of FIG. 3.

5 is a diagram showing the structure of an ETT table according to another embodiment of the present invention.

FIG. 6 is a diagram illustrating instances of the ETT table of FIG. 5.

7 is a diagram showing an apparatus for controlling PSIP table storage of a digital broadcast receiver according to an embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

100: digital broadcast receiver 110: tuner

115: demodulator 120: demultiplexer

130: PSIP processing unit 140: EPG storage unit

150: microprocessor 160: OSD signal processing unit

180: video decoder 190: video processing unit

Claims (6)

In the Program and System Information Protocol (PSIP) including an event information table (EIT) containing a title and guide data of a transport stream, and an extended text table (ETT) containing detailed information about virtual channels and broadcast programs, And adding an instance index information field to the header parts of the EIT and the ETT, respectively, to distinguish the corresponding instances having the same version number. The method according to claim 1, The header of the EIT and ETT starts with a table_id field, and the index information field is added after the table_id field. The method according to claim 1, And the instance index information field is assigned with 8 bits. A demultiplexer for separating audio, video, and program and system information protocol (PSIP) tables from the input transport stream; A storage unit in which index information for event information table (EIT) and extended text table (ETT) instances to be stored are preset; And After receiving the PSIP table output through the demultiplexer and checking the instance index information fields located in the header parts of the EIT and the ETT in the PSIP table, the index information of the EIT and the ETT is checked and the identified index information is stored in the storage unit. And a PSIP processing unit for determining whether to store stored index information and determining whether to store EIT and ETT data. The method of claim 4, The PSIP processor reads and stores all the data of the message body of the EIT and the ETT when the index information identified in the EIT and the ETT is included in the index information stored in the storage unit, and the version number of the EIT and the ETT. And storing the EIT and ETT when the same EIT and ETT data are previously stored in the storage unit. The method of claim 4, And the PSIP processing unit discards the EIT and the ETT when the identified index information is not included in the index information stored in the storage unit.

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