JP2003008526A - Data processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data processor that can process partial transport stream data at a high-speed. SOLUTION: The data processor adapts hardware for conducting comparison processing by comparing attached interface contents acquired in the past with attached information acquired this time in order to discriminate e.g. presence of update as to attached information (PAT(Program Association Table), PMT(Program Map Table), SIT(Selection Information Table)) extracted from a partial transport stream(PTS). The data processor informs a system controller for controlling data processing about the update when the comparison results indicates the presence of update. Thus, the system controller needs to conduct comparison processing through software processing different from a conventional data processor. The system controller has only to receive the notice based on the result of comparison and to make a required processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing device for processing transport stream data defined under a predetermined serial data interface.

[0002]

2. Description of the Related Art In recent years, digital satellite broadcasting has become widespread. Digital satellite broadcasting is more resistant to noise and fading than existing analog broadcasting, and can transmit high-quality signals. In addition, frequency utilization efficiency has been improved, and multi-channelization has been realized.

Under the current standard in such digital satellite broadcasting, video data and audio data as programs (programs) are MPEG (Moving Pictur).
e Experts Group) 2 system is compression-coded. Then, the compression-encoded program data is multiplexed with various additional information such as program information and reception limited information, and is called a so-called transport stream (hereinafter also referred to as TS (Transport Stream)). It is transmitted according to the format of stream data.

By connecting the digital satellite broadcast receiver to a digital storage device such as a digital VTR (video Tape Recorder) or HDD (hard disk), the program received by the digital satellite broadcast receiver is converted into a TS format. It has been proposed and realized to configure a system so that the system can be transferred and recorded as it is to a digital storage device. With such a system, the data of the received program is recorded in the compressed and encoded state without being demodulated, so that the signal processing for the recording is also efficient and the reproduction is performed. The image quality and sound quality of the program to be executed will not be deteriorated. Furthermore, various additional information that is characteristic of digital satellite broadcasting will also be recorded, so if these additional information are used during playback,
It is also possible to obtain a more complete playback function.

At present, the IEEE (Ins) is used as a digital data interface for connecting the digital satellite broadcasting receiver and the digital storage device.
It is known that the titute of Electrical Engineers) 1394 data interface is adopted. IE
The EE1394 data interface is, for example, SCS.
The data transfer rate is faster than I or USB,
As is well known, isochronous communication in which it is guaranteed that a required data size is periodically transmitted and received is possible.
For this reason, the IEEE 1394 data interface is advantageous for transferring stream data such as AV (Audio / Video) in real time.

In practice, the TS transmitted via the IEEE 1394 bus is extracted from the original TS received, for example, so that at least information regarding a specific program required for recording is selected. Stream data that is called a partial transport stream (hereinafter also abbreviated as PTS).

[0007] For example, in the digital satellite broadcasting receiver as described above, it is possible to input a program in the PTS format recorded in the digital storage device, perform required data processing, and output as image / sound. It is said that As described above, the additional information is inserted in the PTS. However, when performing data processing to reproduce and output the input PTS, the additional information inserted in the PTS is extracted and acquired. Then, for example, the controller takes in the acquired additional information, and the control processing for performing necessary data processing according to the information content is executed. Also, when the additional information is acquired, for example, by software processing of the controller,
Whether or not the acquired additional information is updated is always determined, and if it is determined that the additional information is updated, the updated additional information is newly captured, and the acquired additional information is acquired. Based on the above, data processing is performed. That is, the data processing is switched. For example, if the additional information is updated,
This is the case where some change occurs in the program contents of the PTS. By changing the data processing according to the update of the additional information as described above, P
It is possible to reproduce and output an appropriate image / sound corresponding to the change of the TS program content.

[0008]

By the way, in the operation related to the switching of the data processing as described above, the controller performs the data processing corresponding to the content of the captured additional information, and the additional information is acquired every time the additional information is acquired. This means that the additional information is compared as an interrupt process. Since all such processing is executed by software, the processing load on the controller will be correspondingly heavy. In particular, for example, when the PTS once recorded in the digital storage device is reproduced, there is a high possibility that the contents of the PTS change in a relatively short time, and the additional information is updated accordingly. Since it will be high, the processing load required to compare the additional information is heavier.
There is a problem that the processing speed is likely to decrease.

[0009]

In view of the above problems, the present invention is configured as a data processing device as follows. In other words, the input means for inputting stream data specified under the standard of a predetermined data interface and what should be inserted into the stream data are specified, and it is necessary to perform the required data processing on the stream data. Additional information acquiring means for extracting and acquiring predetermined additional information, additional information formed by hardware, currently acquired by the additional information acquiring means in the past, and currently effective, and additional information acquired this time. Control for executing a control process for performing the above data processing when a comparison result is obtained by comparing means for making a comparison as to whether or not the contents of information match, and this comparing means gives a comparison result. And a notification means for notifying the means.

In the above-mentioned structure, the additional information inserted in the input stream data is compared with the previously acquired one and the newly acquired one by hardware processing. Then, for example, when a comparison result indicating that the contents do not match is obtained, the control means that executes data processing according to the contents of the additional information is notified.
In other words, in the present invention, the comparison processing of the additional information acquired last time and the additional information acquired this time is configured to be executed by hardware. For example, the control means for executing the data processing by software processing is added information The processing load on the control means is reduced as compared with the case where the comparison is performed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A data processing apparatus as an embodiment of the present invention will be described below. The data processing apparatus according to the present embodiment is capable of receiving and demodulating digital satellite broadcasts and outputting video / audio signals, and is connected to a digital storage device by an IEEE 1394 data interface to record and reproduce stream data. As an example, it is installed in a digital satellite broadcast receiver that is capable of. The following description will be given in the following order. 1. Digital satellite receiver 2. Data structure of additional information 2-1. Transport packet header 2-2. PAT section 2-3. PMT section 2-4. SIT section 2-5. DIT section 3. Additional information processing unit 4. Processing operation

1. Digital Satellite Broadcast Receiver FIG. 1 shows a configuration example of a digital satellite broadcast receiving apparatus according to this embodiment. As is well known, in digital satellite broadcasting, a digital broadcasting signal is output from a communication satellite or a broadcasting satellite. The parabolic antenna 12 receives a broadcast signal from this satellite and uses a built-in LNB (Low Noize Block).
It is converted into a predetermined high frequency signal by a Down Converter) and supplied to the digital satellite broadcast receiver 1.

In the digital satellite broadcast receiver 1, the reception signal received by the parabolic antenna 12 and converted into a predetermined frequency is input by the front end unit 2. In the front end section 2, the system controller 1
Based on a setting signal that sets transmission specifications from 0, a carrier (reception frequency) determined by this setting signal is received and subjected to, for example, Viterbi demodulation processing, error correction processing, etc. Stream).

TS according to this digital satellite broadcasting standard
As is well known, for example, MPEG2 (Moving Picture)
According to the Experts Group Layer 2) method, compressed data obtained by compressing video signals and audio signals of a plurality of programs (programs) and various kinds of additional information are multiplexed. The compressed data obtained by compressing the above-mentioned video signal and audio signal is multiplexed as an ES (Elementary Stream). The additional information inserted by the broadcast side is PAT.
(Program Association Table), PMT (Program Map Ta
ble) and other tables that store PSI (Program Specifi)
c Information: Program specific information) and SI (Service Info)
rmation: program sequence information). Then, the above-mentioned information is multiplexed by forming a TS by a 188-byte transport stream packet (TS packet), and the above-mentioned E is added to this TS packet.
This is performed by storing S and various additional information. The TS obtained at the front end unit 2 is supplied to the descrambler 3.

Further, in the front end section 2, the TS is changed to PSI (Program Specific Information).
Packet and update its tuning information,
Component PID of each channel in TS (Pro
Gram ID) is obtained and transmitted to the system controller 10, for example. In the system controller 10, the acquired PI
D will be used for received signal processing.

In the descrambler 3, the descramble key data prepared in advance is received from the system controller 10, and the system controller 10 sends the P
The ID is set. Then, the descramble processing is executed based on the descramble key data and the PID. In this case, the TS descrambled by the descrambler 3 is the terminal T1 of the switch unit 6.
To IEEE 1394
It is supplied to the communication unit 4. Also,
For confirmation, the TS output from the descrambler 3 may include ESs of a plurality of programs multiplexed, and additional information such as PSI may be removed. Instead, it is multiplexed.

The switch unit 6 is the system controller 1
By controlling 0, the switching is performed so that the terminal T1 or the terminal T2 is selectively connected to the terminal T3. Then, the received broadcast signal is decoded to video /
When outputting as an audio signal, the TS output from the descrambler 3 is supplied to the demultiplexer 7 by connecting the terminal T1 to the terminal T3.
On the other hand, when the external TS received by the IEEE 1394 communication unit 4 is decoded and output as a video / audio signal, by connecting the terminal T2 to the terminal T3, the IEEE 1394 communication unit 4 is connected. The TS thus received is output to the demultiplexer 7.

The demultiplexer 7 separates a required TS packet from the TS supplied from the descrambler 3 according to the filter condition set by the system controller 10. Thereby, for example, the demultiplexer 7
In the case of T
As S packets, TS packets of video data compressed by the MPEG2 system and TS packets of audio data compressed by the MPEG2 system are obtained. Then, the compressed video data and the compressed audio data thus obtained are output to the MPEG decoder 8.

The individual packets of the compressed video / audio data separated by the demultiplexer 7 are P
Each of them is input to the MPEG decoder 8 in a format called ES (Packetized Elementary Stream). Further, the setting of the above-mentioned filter condition is performed by the PAT included in the TS in the demultiplexer 7,
The PMT or the like is extracted and transferred to the system controller 10. And the system controller 1
0 is set to the filter condition for the demultiplexer 7 based on the information content described in the transferred PAT, PMT, or the like.

The MPEG decoder 8 decodes (decompresses) the compressed video data in accordance with the MPEG2 format, and decodes the compressed audio data in accordance with the MPEG2 format in synchronization with the video data output. And an audio decoder. And
The input compressed video data is decoded by the video decoder, and the input compressed audio data is decoded by the audio decoder. In this case, for example, regarding the decoded video data, for example, NTS
Corresponding to a predetermined television system such as the C system, necessary signal processing is performed so that an image is properly displayed, and an analog video signal is output. Also,
For the decoded audio data, for example, D
A / A conversion is performed and output as an analog audio signal.

The IEEE 1394 communication section 4 is provided to enable communication between the digital satellite broadcast receiver 1 and an external device via the IEEE 1394 bus 11. And as a basic configuration for this, as is well known, in terms of hardware and firmware, the physical layer, the link layer,
A transaction layer and a serial bus management are provided, and an application is provided above the transaction layer. These implement, for example, the function as the transmission / reception unit 4d. Further, in this case, the filter units 4a, D
It is assumed to have the functions of the IT insertion processing unit 4b and the SIT insertion processing unit 4c.

In this case, the IEEE 1394 communication section 4 is
TS received by the digital satellite broadcast receiver 1 and descrambled by the descrambler 3 can be input and can be transmitted and output to an external device connected via the IEEE 1394 bus 11. . Then, for the IEEE 1394 communication unit 4 in this case, the storage unit 5 which is a digital storage device as an external device.
Is connected. The storage unit 5 is a hard disk drive here, and can store a large amount of data. In this way, by connecting the digital storage device as an external device, the data received and acquired by the digital satellite broadcast receiver 1 can be recorded and stored in the digital storage device in the TS format. Further, it becomes possible to receive and acquire the data in the TS format stored in the storage unit 5 via the IEEE 1394 bus 11 and output it as, for example, video / audio data.

As the storage unit 5, other digital storage devices such as a digital VTR may be adopted. Although the storage unit 5 is an external device separate from the digital satellite broadcast receiver 1 here, for example, the IEEE 13
It may be configured to be built in the digital satellite broadcast receiver 1 after being connected by the 94 data interface.

The operation of the IEEE 1394 communication section 4 for transmitting and storing the data received and acquired by the digital satellite broadcast receiver 1 to the storage section 5 is as follows. As described above, the TS received by the digital satellite broadcast receiver 1 and scrambled by the descrambler 3 is multiplexed with data of a plurality of programs, and is further multiplexed with various additional information. Is in a state of Therefore, the IEEE 1394 communication unit 4 first supplies the TS input from the descrambler 3 to the filter unit 5. The filter unit 5 separates TS packets of only the required program (content) from the input TS. Even in this case, as described above as the operation of the demultiplexer 9, for example, the filter condition for extracting the necessary TS packet is set based on the content of the additional information such as PAT and PMT included in the TS. Is set. The PSI inserted in the PTS transferred by the IEEE 1394 data interface is PA
T and PMT should be limited. For example, in the filter unit 5, PAT and PM are defined.
It is also made to reconstruct a PSI consisting of T only. The details of PAT and PMT will be described later.

Here, the TS for transmission is reconstructed depending on the TS packet separated by the filter unit 5. This TS corresponds to the program required from the original TS. Since only information is partially extracted, it is called "Partial Transport Stream (PTS)". Although detailed description is omitted here, PTS is, for example, DVB ET.
S 300 468 Specification for Service information (SI)
in DVB systems, ARIB-STD B1 / B21, and ARIB TR-B15
Stipulated in the standard document as a standard for transferring a TS by a serial data interface typified by IEEE1394. Further, PAT, PMT, SIT, DIT, and the like, which are additional information to be inserted into the PTS, are also defined as described later.

In the IEEE 1394 communication section 4,
If necessary, the DIT is inserted into the PTS obtained by the function of the filter unit 5 by using the function of the DIT insertion processing unit 4b. Also, SIT
The SIT is inserted by using the function of the insertion processing unit 4c. The DIT insertion processing unit 4b and the SIT
Each function of the insertion processing unit 4c is realized by, for example, software processing by the system controller 10. For example, a circuit part realized by hardware may be provided in the IEEE 1394 communication unit 4. . For details of DIT and SIT,
It will be described later together with PAT and PMT.

As described above, if necessary, DIT,
The PTS in which the SIT is inserted is packetized according to the format of the IEEE 1394 data interface by, for example, the transmitting / receiving unit 4d, and the IEEE 139
4 to the target device (node) via the bus 11. For example, in this case, it is transmitted to the storage unit 5. Then, the storage unit 5 stores the received PTS. That is,
The program data received by the digital satellite broadcast receiver 1 can be stored in the storage unit 5 in the PTS format which is one of the TS formats.

Further, in the digital satellite broadcast receiver 1 of the present embodiment, the PTS data received and acquired via the IEEE1394 communication section 4 is finally output as video / audio data via the MPEG decoder 8. be able to. That is, in the case of the present embodiment, the program data in the PTS format stored in the storage unit 5 can be received and acquired via the IEEE 1394 communication unit 4, and this data can be output as video / audio data. It is said that

In the case of the present embodiment, the data of the program as the PTS which is read by the storage unit 5 and transmitted through the IEEE1394 bus 11 is the IEEE13.
94 is received by the function of the transmission / reception unit 4d in the communication unit 4. Then, the data thus received and acquired is transferred to the additional information processing unit 9.

In the additional information processing section 9, the PTS transferred as described above is input and the following signal processing is executed. Note that the internal configuration and operation of the additional information processing unit 9 of the present embodiment will be described in detail later, so only the basic operation description will be given here.

For example, in order to properly output the PTS received and acquired via the IEEE 1394 communication unit 4 as video / audio, for example, the system controller 10 may change the PT according to the content of the additional information inserted in the PTS.
It is necessary to execute various control processes for S data processing. In other words, various data processing such as extraction of compressed video / audio data (PES) in the demultiplexer 7 needs to be properly executed, and such data processing is performed by the system controller 1
0 is performed by referring to the content of the additional information and executing the control processing as appropriate.

The additional information processing unit 9 is thus adapted to extract the additional information required for the system controller 10 to execute the data processing control from the input PTS. Therefore, the additional information processing unit 9 bypasses the input PTS to bypass the terminal T of the switch unit 6.
It has a signal path for outputting as 2, and an additional information extracting circuit system for branching and inputting the input PTS.

When reproducing and outputting the PTS received and acquired through the IEEE 1394 communication section 4, the switch section 6 is used.
Under the control of the system controller 10 is a terminal T3.
Is switched so that is connected to the terminal T2. Therefore, the PTS that has passed through the additional information processing unit 9 is
It is input to the demultiplexer 7 via the switch unit 6,
Further, it is supplied to the MPEG decoder 8.

Here, the additional information to be extracted by the additional information processing unit 9 is PAT which is PSI data,
SMT, which is additional information added when the PMT and TS are converted to PTS, is extracted. In addition, like the SIT, the DIT inserted as necessary during the conversion to the PTS is also extracted.

The above-mentioned additional information (PAT, PMT,
When extracting (SIT, DIT), the extraction is performed according to the structure of the section. That is, P
As is well known, each additional information such as AT, PMT, SIT, and DIT is transmitted in TS packet units from the viewpoint of the structure of Transport Stream Packet. The TS packet storing this additional information has a header. And a section which is a payload following the section. Then, the additional information processing unit 9 extracts the additional information by extracting the structure of the section as the payload from the received and received packet.

Each additional information thus extracted is
For example, the system controller 10 reads and references the contents. Then, control processing for necessary data processing is executed according to the contents. For example, the filter condition in the demultiplexer 7 is set based on the additional information such as PAT, PMT, and SIT. Also, DIT
Is information indicating that discontinuity of information content has occurred in the PTS as described later.
Is obtained, the system controller 10
Required data processing corresponding to the occurrence of discontinuity in the PTS is executed.

2. Data structure of additional information 2-1. Transport packet header And, in this embodiment, the IE is performed as described above.
EE1394 data interface (IEEE139
4) The additional information processing unit 9 is characterized by extracting PAT, PMT, SIT, and DIT as additional information from the PTS input by the communication unit 4) and executing the required processing. Therefore, prior to explaining the internal configuration of the additional information processing unit 9, the additional information to be extracted from the PTS in the additional information processing unit 9 is:
The PAT, PMT, SIT, and DIT will be described.

By the way, each of the above-mentioned additional information is added to the transport stream when it is inserted into the PTS.
It is supposed to be packetized and transmitted by the structure as a packet (TS packet). 1 TS packet
It has a fixed size of 88 bytes, and is composed of a 4-byte transport packet header placed at the head and an adaptation field or section as a payload of the remaining 184 bytes. Then, when the TS packet transmits additional information, as described above, the transport packet header is followed by the section to form the TS packet.

Therefore, first, the structure of the transport packet header will be described with reference to FIG. Transport Packet Header, as shown by FIG.
Is formed by sequentially arranging sync_byte (8bit) transport_error_indicator (1bit) payload_unit_start_indication (1bit) transport_priority (1bit) PID (13bit) transport_scrambling_control (2bit) adaptation_field_control (2bit) continuity_counter (4bit) from the top position.

For example, 0x47 is stored in sync_byte (8 bit) as a unique synchronization pattern. transport_error_
The indicator (1 bit) indicates whether or not there is an error in the TS, but normally "0" is stored to indicate that there is no error.
payload_unit_start_indication (1bit) indicates whether or not the current packet is the first packet of the table and PES. If it is the first packet of the table and PES, '1' is stored, otherwise it is stored. Stores '0'. The transport_priority (1 bit) stores information indicating the priority (priority) of the current packet.

The PID (13 bits) stores a packet ID for identifying the type of the current packet. That is, PI
D identifies the type of payload stored in the current packet. By the way, if the payload is PAT, PI
D = 0x0000. The value designated by the PAT is stored in the PID of the PMT. Also, DIT is 0X001E,
SIT is defined as being 0X001F.

Regarding transport_scrambling_control (2bit), it is set to "0" if scramble processing is not performed.
Stores 0 ', and if applied, stores a value other than' 00 'as needed.

The adaptation_field_control (2 bits) is information indicating the typed contents of the payload following the transport packet header. For example, if "10" is stored, it indicates that it is adaptation_field only, no payload. That is, it is indicated that only the adaptation field is arranged following the current TS packet header, and the payload is a TS packet that does not exist. Also, if '01' is stored, no ada
ptation_field, payload only. In other words, there is no adaptation field,
It will indicate that the section is placed as a payload.

Continuity_counter (4bit) is a counter indicating the continuity of TS packets whose values stored in PID are the same, and is 0x0 unless the first value is specified, and thereafter, as the packet is inserted. The value incremented one by one is stored. When it takes a value of 0xF, it is supposed to wrap around to 0x0. This is supposed to be automatically counted up every time the system inserts a packet.

2-2. PAT Section Next, PAT will be described. PAT is "Progra
m Association Table ”, the broadcast side is PSI
Is information to be inserted as one of the above. The PAT has contents that are unique to each carrier, and the PMT PI that represents the channel information in each carrier and the contents of each channel.
It is described as D. As described above, PAT is defined as PID = 0x0000.

FIG. 4 shows the structure of a section as a PAT. As shown in this figure, as the PAT section (program_association_section), the first tab
Required data areas (descriptors) are arranged sequentially from le_id (8 bits). Then, at the end thereof, a 32-bit CRC (CRC_32) which is an error detection code is arranged. For reference, the contents of each descriptor are as follows.

Table_id (8bit): Describe "0x00". section_syntax_indicator (1bit): Describe '1'. section_length (12bit): Describe the section length of PAT. Since the maximum length of all sections is 1024 bytes, the maximum value is 1021. transport_stream_id (16bit): Describe transport_stream_id of the transport stream including the PAT. version_number (5bit): In normal operation, describe the value incremented by 1 each time the content is updated. However,
When a system abnormality occurs, it is possible to describe an incremented value of 1 or more. current_next_indicator (1bit): Describe "1". section_number (8bit): Describe "0x00". last_section_number (8bit): Describe "0x00".

Following last_section_number (8bit),
[program_loop] is placed. In addition, this [program_loo
The maximum number of loops for p] is unspecified. In [program_loop], descriptors of program_number (16bit) network_PID (8bit) program_map_PID (8bit) are arranged. Each descriptor is as follows. program_number (16bit): service id of the target service
Describe. Also, program_number = “0x0000” (NIT PID [“0x0010”] is described in the subsequent PID field)
Describe only one program_loop in PAT. network_PID (8bit): Describe the PID (“0x0010”) of NIT. program_map_PID (8bit): Describe the PMT PID. The maximum number of programs (services) that can be assigned to the same PID value is 4.

2-3. The PMT section PMT (Program Map Table) is similar to the PAT in that it is information inserted by the broadcast side as one of PSI. PMT has contents for each channel,
For example, the components that make up each channel (video / audio, etc.) and the E required for descrambling
The PID of a CM (Encryption Control Message) packet is described. The PMT PID is to be specified by the PAT.

FIG. 5 shows the PMT section (prpgram map s
section). Also in the PMT section, table_id (8 bits) is arranged at the head, and a required data area (descriptor) is sequentially arranged. And finally, 32bit
CRC (CRC_32) is placed. The contents of each descriptor are shown below.

Table_id (8bit): Describe "0x02". section_syntax_indicator (1bit): Describe '1'. section_length (12bit): Describe the section length of PMT. Since the maximum length of all sections is 1024 bytes, the maximum value is 1021. program_number (16bit): service id of the service
Describe. version_number (5bit): In normal operation, describe the value incremented by 1 each time the content is updated. However,
When a system abnormality occurs, it is possible to describe an incremented value of 1 or more. current_next_indicator (1bit): Describe "1". section_number (8bit): Describe "0x00". last_section_number (8bit): Describe "0x00". PCR_PID: Target PCR (Program Clock Reference)
Describe the PID of the packet (the target PCR packet is
It is always sent in the lower layer slot during layered modulation transmission.) Program_info_length: Describe the loop length of 1st_loop. The maximum loop length is limited by section_length.

[1st (prpgram) loop] [2nd (ES) _loop] (maximum loop number = 32) is arranged as a loop. The following descriptors are placed in one [ES_loop]. stream_type: Describe the stream format identification of the target ES (Elementary Stream). elementary_PID: Describes the PID of the TS packet transmitting the associated ES or payload. ES_info_length: Describe the length of the ES descriptor that follows.

2-4. The SIT section SIT (Selection Information Table) is additional information specific to the PTS, and represents services and events transmitted by the PTS. Also, SIT
Is treated as one of SI (Service Information), but it is specified that only the SIT and DIT should be used as the SI table to be inserted and transmitted in the PTS. The PID of SIT is defined as 0X001F.

FIG. 6 shows the SIT section (selection_inf
ormation_section). Also in this SIT, a required data area (descriptor) is sequentially arranged from the head table_id (8 bits), and finally a 32-bit CRC (CRC
_32) is placed. The contents of each descriptor are as follows.

Table_id (8bit): Describe "0x7F". section_syntax_indicator (1bit): Describe '1'. section_length (12bit): Describe the SIT section length. The section length must not exceed 4093 bytes, as the total section length cannot exceed 4096 bytes. version_number (5bit): In normal operation, describe the value incremented by 1 each time the content is updated. However,
When a system abnormality occurs, it is possible to describe an incremented value of 1 or more. Also, current_
When next_indicator is "1", it indicates the version number of the current table. current_next_indic
When ator is "0", it indicates the version number of the next table. current_next_indicator (1bit): When it is "1", it indicates that the table is the current table, and when it is "0", it indicates that the table to be sent is not adapted yet and is used as the next table. section_number (8bit): Describe "0x00" to indicate the section number. last_section_number (8bit): Describe "0x00" as the last section number. transmission_info_loop_length (12bit): Describe the total number of bytes of the Descriptor that describes the PTS transmission parameter. Then, the following descriptors are described in the Descriptor in transmission_info_loop. service_id (16bit): Describe the service identifier.
This service_id serves as a label for distinguishing this service from other services in the transport stream, and is program_nu in the PMT section.
Equal to mber. running_status (3bit): ARIB STD-B10
According to the definition, describe the numerical value indicating the progress status of the event of the original stream. This indicates the progress status of the current event in the original stream, and if there is no current event in the original stream, the status is considered to be inactive. service_loop_length (12bit): Descri including SI related information of the service and event included in the following PTS
Specifies the total byte length of ptor_loop.

2-5. DIT section DIT (Discontinuity Information Table) is additional information (SI table) peculiar to the partial TS, and indicates the position (change point) of the discontinuity in order to indicate that discontinuity has occurred in the partial TS. It is specified to be inserted. DIT is to be transmitted by 1 TS packet, and is defined as PID = 0X001E.

DIT section (discontinuity_inform
ation_section) has the structure shown in Fig. 7,
Table_id (8bit) section_syntax_indicator (1bit) reserved (1bit) reserved (2bit) section_length (12bit) transition_flag (1bit) reserved (7bit) are arranged in order from the beginning, and for example stuffing_byte as AL in the remaining area.
L'1 'is stored.

In the DIT section,
0x00 is to be stored in pointer_field (8bit), which indicates that the first data in the table continues immediately after pointer_field. In table_id (8bit), 0x7E indicating that the table is a DIT section is stored. By storing “0” for section_syntax_indicator (1 bit), it is indicated that the table as the DIT section is a so-called Short section. Also, section_length has 0x001
Is stored, and the table information is 1 following this field.
It indicates that it is a byte. transition_fla
g is '0', depending on the predetermined condition for inserting DIT.
Any value of "1" is set.

3 to 7, uimsbf, bslbf, and rpchof shown as identifiers represent bit string notation, and uimsbf is an unsigned integer with the most significant bit at the beginning. most s
ignificant bit first). Also, b
slbf is a bit string with the left bit at the beginning (bit string, le
ft bit first), and rpchof is the remainder of the polynomial coefficient with the highest rank (remainder polynominal c
oefficients, highest order first).

3. Additional information processing unit Next, each additional information (PAT, PMT, SIT, D
An internal configuration example and an operation example of the additional information processing unit 9 that performs hardware-like processing for (IT) will be described with reference to FIG. Here, in the case of the present embodiment, FIG.
The configuration of the additional information processing unit 9 shown in is formed by hardware. The PTS transmitted from the IEEE 1394 communication unit 4 and input to the additional information processing unit 9 is branched as shown in FIG. 2, and one is bypassed as it is and output to the switch unit 6. And
As described above, the video data is finally output as video / audio data by being processed through the switch unit 6 and the demultiplexer 7 → the MPEG decoder 8.

The other branched PTS is input to the section filter section 21. As I mentioned before,
The PTS is serially transferred in units of TS packets of 188 bytes. The additional information (PAT, PMT, SIT, DIT) inserted in the PTS is 1
State stored in one TS packet, or multiple T
It is transferred in the state of being divided and stored by the S packet.

The section filter unit 21 detects the necessary information such as each PID of the TS packet input in this way, and forms PAT, PMT, SIT, and DIT as the payload of the TS packet. If the data is stored, it is extracted. As a result, one section data transmitted by one TS packet is extracted. Further, for example, when one section data is divided and transmitted by a plurality of TS packets, the processing is performed so that the sections of the section data sequentially extracted from the TS packets are connected, and finally, The data structure is formed as a section. In this way, PAT, P
The additional information of MT, SIT, and DIT is extracted.

If the additional information thus extracted is one of PAT, PMT, and SIT other than DIT, the additional information is transferred to the CRC check unit 22. In this case, the CRC check unit 22 uses the CRC corresponding to each of PAT, PMT, and SIT.
It is assumed that a check circuit is provided, and the section filter unit 21 is configured to perform transfer to the CRC check circuit corresponding to the type of the extracted additional information.

As described above with reference to FIGS. 4 to 6,
Although 32-bit CRC is added to PAT, PMT, and SIT, the CRC check unit 22
With respect to the input PAT, PMT, SIT, error check is performed using the CRC inserted in the structure. If the error check result is NG, it can be said that the content of the additional information is unreliable, so the PAT, P
MT and SIT are discarded as they are. As a result, the PAT, PMT, and SIT having an error are not used as comparison targets in the comparator 25, which will be described later, so that the comparison result in the comparator 25 can be made more reliable.

If the error check result is OK, the PAT, PMT, SI that performed the error check
Transfer T to RAM 23. In the RAM 23, the transferred PAT, PMT and SIT are respectively written and held in a predetermined area. Then, each time PAT, PMT, or SIT is newly acquired by the section filter unit 21, unless the CRC check result is NG, rewriting to the newly acquired PAT, PMT, or SIT is performed. In other words, the RAM 23 has the PA
This means that T, PMT, and SIT are always held temporarily.

The data lengths of PAT, PMT, and SIT are variable depending on the number of loops of the descriptor, for example. However, in view of the current usage of these additional information, the storage of each additional information in the RAM 23 is performed. The area is about 1K bytes for PAT and PMT.
Also, it has been found that about 4 Kbytes is sufficient for SIT. In other words, the size of the RAM 23 only needs to have a small capacity of about 6 Kbytes or more. The same applies to the register 24 described below.

The register 24 holds the PAT, PMT, and SIT transferred from the RAM 23. Then, the PAT, PMT, and SIT held here are transferred to the system controller 10 at the request of the system controller 10 connected from the host interface 28 via the system bus. That is, the system controller 10 fetches the information of PAT, PMT, and SIT stored in the register 24,
The control for data processing is executed by referring to the contents.

Therefore, the PA held in the register 24
The contents of T, PMT, and SIT are always required to be the latest contents corresponding to the data of the current stream.
That is, when the contents of the acquired PAT, PMT, and SIT are updated, the PAT, PMT, and SIT held in the register 24 need to be updated accordingly, which is as follows. Is done.

In the additional information processing unit 9 of this embodiment, a hardware comparator 25 is provided.
The comparator 25 determines whether or not the data contents of the PAT, PMT, SIT currently written in the RAM 23 and the PAT, PMT, SIT currently held in the register 24 match. Will be compared.

The operation of the above comparison processing is performed by PAT, PM.
It is almost the same for T and SIT, but here PA
The case of T will be described as an example. At a certain point, the section filter unit 21 extracts the PAT, which is the CRC.
It is assumed that the data is written in the RAM 23 after the check. Then, in the comparator 25, the P written in the RAM 23 is
A comparison is made as to whether the AT and the contents of the PAT currently held in the register 24 match.

By the way, when comparing the contents of PAT, it is general to refer only to the version_number that is incremented each time the data contents are updated, but in the present embodiment, the comparison is made. , For example P
It is made to compare the whole section structure as AT. Since the version_number is 5-bit data, even if the PAT contents are updated and different, there is a possibility that the version_number happens to be the same version_number. Therefore, by comparing all the data structures as sections as in the present embodiment, it is possible to obtain a comparison result without error.

Further, according to the present invention, for example, version_nu
It is only necessary to obtain the correct detection result above a certain required level by avoiding the possibility of erroneous detection due to comparing only mber as a comparison target. It is also possible to make a comparison for the children. For example, in the case of PAT, versio is used as a descriptor that always changes according to the update.
n_number and description contents in [program_loop] can be mentioned, but in actual operation, these version_numb
er and the description content of only [program_loop] are compared, it is possible to adopt a configuration in which only these descriptors are compared if an accurate comparison result is obtained. In this case, since the number of bits to be compared by the comparator 25 is reduced, the circuit scale of the comparator 25 can be reduced depending on the circuit configuration.

Then, as a result of comparison in the comparator 25, the contents of the PAT are the same. That is, the contents of the PAT currently held in the register 24 as valid and the contents obtained this time. The contents of the PAT held in the RAM 23 are the same, which means that the contents have not been updated. Therefore, in this case, R
The PAT held in the AM 23 is not transferred to and written in the register 24, and the PAT held in the register 24 is treated as it is as valid information. On the other hand, in the case where the comparator 25 obtains the comparison result that the contents of the PAT do not match, this is obtained this time and the RAM 23 is obtained.
This means that the content of the PAT written in the field has been updated. Therefore, in this case, the PAT written in the RAM 23 is transferred to the register 24. As a result, the register 24 holds the newly updated PAT.

When the comparator 25 obtains the comparison result that the data contents do not match as described above, the comparator 25 outputs the PA to the register 24.
In parallel with the T rewriting operation, a signal corresponding to the detection result is output to the detector 26. Detector 2
In 5, when detecting that the PAT is updated based on this signal input, an interrupt request signal is generated and output to the control register 27. The control register 27 transmits the input interrupt request signal to the system controller 10 via the host interface 28. That is, the interrupt request is notified. The system controller 10 that receives this interrupt request is configured to fetch the PAT information stored in the register 24, for example, as interrupt processing. That is, the PAT with new contents is taken in. Then, thereafter, the control processing is executed so that the appropriate data processing according to the content of the updated PAT is performed.

The above PAT processing is performed by the PMT.
The same applies to SIT and SIT. That is, PMT
Also, SIT and SIT are compared with the PMT and SIT held in the register 24 each time they are newly acquired and written to the RAM 23. Also, at this time, PMT and SIT
It is made for the comparator 25 to compare the entire structure of the sections, rather than just the ion_number. If a comparison result that the data contents do not match is obtained, the new PMT and SI are added.
T is written and held in the register 24, and the interrupt request is notified to the system controller 10.

The above description is for the case where the additional information extracted by the section filter unit 21 is one of PAT, PMT, and SIT. Next, a case where the DIT is extracted will be described. As described above, the DIT is additional information indicating that there is discontinuity in the contents of the PTS.
Whenever IT is detected, PAT, PMT, S
It is necessary to execute the required data processing such as new acquisition of IT. Therefore, it is necessary to notify the system controller 10 of the fact that the DIT is detected. Therefore, the additional information processing unit 9 of the present embodiment is configured to notify the system controller 10 of the interrupt request even when the DIT is extracted. As a result, the system controller 10 causes the DI
It is possible to execute an appropriate process corresponding to the detection of T.

Here, as described with reference to FIG. 7, the DIT
No CRC is inserted in the section structure. Therefore, when the section filter unit 21 extracts the DIT, the DIT is output to the detector 26. When the detector 26 detects that the input signal is DIT, it generates an interrupt request signal based on the detection of DIT and outputs it to the control register 27. In this case, the control register 27 notifies the system controller 10 of the interrupt request based on the detection of DIT via the host interface 28. It should be noted that when the system controller 10 fetches the detected DIT in response to the interrupt request, it may be performed by the demultiplexer 7, for example. Alternatively, although not shown in FIG. 2, the additional information processing unit 9 may be configured so that the DIT extracted by the section filter unit 21 can be transferred to the system controller 10 via the host interface 28, for example. Conceivable.

By the way, in the past, for example, PTS
Although the comparison processing was performed on the additional information such as PAT, PMT, and SIT extracted from the above, this comparison processing was performed by software processing on the system controller (CPU) side. For this reason,
Each time section data such as PAT, PMT, and SIT is acquired from the PTS, the CPU has to execute the comparison processing, which imposes a heavy processing load on the CPU. I had problems such as not being able to obtain it. In order to reduce the processing load, for example, version_number (5bi
Since only t) is compared, there is also a problem that erroneous detection may occur due to the reasons described above.

On the other hand, in the present embodiment, in the additional information processing unit 9, since the comparator 25 for comparing the contents of the additional information is configured by hardware, it functions as a CPU in the present embodiment. The system controller 10 that does not need to execute the comparison process. Then, as the processing to be executed by the system controller 10, only when the interrupt request is received, it is sufficient to access the register 24 and fetch new additional information (PAT, PMT, SIT). As a result, the processing load on the system controller 10 is significantly reduced. Further, since the comparison processing is executed by hardware, the processing can be performed at high speed, so that the processing speed does not become a problem. Also, because the processing speed is fast enough, it is possible to obtain sufficient processing speed even if it is configured to compare the entire structure of sections, not limited to comparison of only version_number. It also makes it possible to obtain results easily.

4. Processing Operation Subsequently, the processing operation of the system controller 10 linked with the operation of the additional information processing unit 9 will be described with reference to FIGS. 8 and 9. In this case, as the processing routine executed by the system controller 10, first, as shown in step S101 of FIG. 8, the additional information processing unit 9 is instructed to acquire the PAT.
The system controller 10 sends, for example, instruction information for PAT acquisition to the host interface 2 in the additional information processing unit 9.
Send to 8. The host interface 28 outputs the PAT acquisition instruction information to the section filter unit 21. As a result, the section filter unit 21 operates to acquire the PAT from the input PTS.

When the section filter unit 21 obtains the PAT, the CRC check unit 22 detects an error in the PAT. Therefore, in the next step S102, the system controller 10 determines whether or not an error has been detected as a CRC error detection result. To this end, the system controller 10
For example, the check result information in the CRC check unit 22 is fetched via the host interface 28.

If it is determined in step S102 that the error detection result is obtained, the process returns to step S101 to instruct the acquisition of the PAT again. That is, in the present embodiment, the process is started by first obtaining the PAT. This is for the following reasons.

The PAT is always sent when a stream is included in the transport stream, and the PA sent in one transport stream.
It is specified that T is one. Therefore, it is considered that the stream does not exist until the PAT is acquired. Therefore, it is necessary to first obtain the PAT. Also, since the PID of the PMT is described in the PAT, the PA must be extracted first in order to extract the PMT.
It is necessary to obtain T.

If a detection result indicating that there is no error is obtained in step S102, step S103
Proceed to. Since the PAT detected as no error at this time is the one acquired for the first time, the PAT is transferred from the RAM 23 to the register 24 and held therein without being compared by the comparator 25.

In step S103, it is determined whether or not the stream data currently being processed is PTS. It should be noted that the determination processing here is, for example, in the case of the configuration shown in FIG.
If it is stream data input via the EEE1394 communication unit 4, it is determined to be PTS, and if it is other stream data input from the front end unit 2 via the descrambler 3, it is not PTS (T
S). Then, if a negative determination result that the PTS is not set is obtained in step S103, this routine is exited, and the process is restarted from step S101, for example. On the other hand, PT
When the positive determination result of S is obtained, the process proceeds to step S104.

By the way, at the stage of executing the processing of step S104, the PTS transferred from the IEEE 1394 communication section 4 is being output to the additional information processing section 9. Then, the section processing unit 21 in the additional information processing unit 9 performs PID detection on the input TS packet. That is, the input TS
The PID of the packet is detected to indicate any one of PAT, PMT, and SIT. Therefore, in step S104, the PID detection result of the section processing unit 21 is fetched and it is determined whether the detected PID indicates PAT, PMT, or SIT.

If it is determined in step S104 that the PID indicates PAT, step S104
Proceed to 105. In step S105, the section filter unit 21 is instructed to acquire the PAT. Then, in the next step S106, the acquired PAT
With respect to, the CRC check unit 22 determines whether or not a detection result with an error is obtained. Here, when the detection result indicating that there is an error is obtained, step S1
Return to the process of 03. Then, as long as the processed data is PTS, the process proceeds to step S104 to restart the additional information acquisition process. Further, when the error detection result is obtained in step S106, the PAT for which the error detection result is output is discarded as a hardware operation in the CRC check unit 22. On the other hand, when the detection result without error is obtained in step S106, the process proceeds to step S107. At this time, the PAT obtained by the CRC check unit 22 as a result of detection of no error is transferred to and written in the RAM 23.

In step S107, it is determined whether or not the data content has been updated. This is performed by using the comparison result in the comparator 25, as described in FIG. That is, in the comparator 25, as described above, the contents of the currently acquired PAT stored in the RAM 23 and the PAT stored as the current valid data in the register 24 are compared. However, as a result of this comparison, when a result that they do not match is obtained, an interrupt request is notified to the system controller 10. Therefore, as the processing of step S107, the determination may be made depending on whether or not this interrupt request is received.

When a negative result is obtained in step S107 because the interrupt request is not received, the process returns to step S103 again in the same manner as when the positive result is obtained in step S106. . On the other hand, if a positive result is obtained in step S107 because the interrupt request is received, step S1
Go to 08.

In step S108, interrupt processing is started in response to the received interrupt request. Then, as the interrupt processing, as shown as the processing of the next step S109, the PAT corresponding processing is executed.

As the PAT handling process in step S109, for example, the following process is executed. At the stage when the process of step S109 is reached, the PAT held in the register 24 until then is held in the comparator 25.
And the PAT acquired this time and stored in the RAM 23
It was detected that there was a disagreement with the contents. That is, the content of the PAT acquired this time is updated, and the updated PAT is stored in the RAM 2 in the register 24.
It is assumed that the data has been transferred, written, and held from No. 3. Therefore, the system controller 10
The PAT stored in the register 24 is read via the host interface 28. As mentioned above, the PAT specifies the PID of the TS packet that transmits the PMT. Therefore, the system controller 10 determines the PID of the PMT to be extracted and specified thereafter based on the contents of the read PAT.
Reset about. In this case, step S1
When the PAT corresponding processing as 09 is completed, step S
The process is returned to 103.

In the previous step S104, PI
When it is determined that D indicates SIT, the process proceeds to step S110. In step S110, the section filter unit 21 is instructed to acquire the SIT. Then, in the next step S111, it is determined whether or not a CRC detection result with an error is obtained for the acquired SIT. In step S111, if a detection result with an error is obtained,
The process returns to the process of step S103 (the SIT in which the error is detected is also discarded). On the other hand, when a detection result without error is obtained in step S111, the process proceeds to step S112. At this time, the SIT obtained by the CRC check unit 22 as a result of detection of no error is transferred to and written in the RAM 23.

In step S112, it is determined whether or not the SIT acquired this time is the first one to be acquired. If a positive determination result that this is the first acquisition is obtained, step S11 is performed.
The process proceeds to step S114 without going through the process of 3. On the other hand, if a negative result is obtained because this acquisition is not the first time, the process of step S113 is performed.

In step S113, it is determined whether or not the data content of SIT has been updated. Also in this case, as in the case of step S107, the determination is made based on the presence or absence of the reception of the interrupt request according to the comparison result in the comparator 25.

When a negative result is obtained in step S113, the process returns to the process of step S103 again in the same manner as when the negative result is obtained in step S107, but the interrupt request is received in step S113. If an affirmative result is obtained as a result of step S114, step S114
Proceed to.

In step S114, the interrupt process is started in response to the received interrupt request, and in the next step S115, the SIT corresponding process is executed as the interrupt process as follows. SIT is PT
Service unique to S and included in PTS (channel number, channel name, channel content, etc.)
And event (program (program name), program start time, synopsis, genre). Then, step S115
At the stage when the processing of (1) is reached, the SIT updated with the new contents is held in the register 24.
Therefore, the system controller 10 uses the register 24
Then, the SIT held in is read, and the information of the new service and event is set and held by referring to the read SIT. This step S
When the SIT corresponding process of 115 is completed, for example, the process of step S101 is restarted.

In addition, step S1 in which PID determination is performed
When it is determined in 04 that the PID indicates PMT, the process proceeds to step S116. The processing from step S116 to step S121 is based on the processing from step S110 to step S115 described above. That is, the processing of steps S116 to S121 is the same as step S110 described above.
The process similar to step S115 is performed for the PMT.

However, since the PID of the PMT is specified by the PAT, when issuing the PMT acquisition instruction in step S116, the system controller 10 determines the section filter unit 2 based on the content of the PAT that has already been acquired.
In 1, the PID to be extracted as the PMT is designated. Further, as the PMT handling process in step S121, the PM newly stored in the register 24 is
The T is read, and the stre described in this PMT
TS that transmits ES stream format and ES or payload based on am_type, elementary_PID, etc.
It is set by updating the information such as the PID of the packet. That is, for the PTS that is currently undergoing data processing, the PID information of the TS packet that transmits each coded signal that constitutes the program is held in, for example, the RAM in the system controller 10.

In this case, step S122
At, the filter condition in the demultiplexer 7 is set. That is, since the PMT information of the TS packet that transmits each encoded signal that constitutes the PTS program is held by the PMT process of the previous step S121, using this PID, the demultiplexer 7 The PES, which is the required compressed video / audio data, is extracted so that the filter condition is set. Thereby, thereafter, the data processing in the demultiplexer 7 is appropriately executed according to the changed contents of the PMT.

The processing shown in FIG. 8 is the processing of the system controller 10 corresponding to the case of acquiring the PAT, PMT or SIT in the additional information processing unit 9, but the system controller 10 corresponding to the acquisition of the DIT.
The processing operation of is as shown in FIG. 9, for example. In this case, first, the section filter unit 21 is instructed to acquire the DIT by the process of step S. Here, as described above, no CRC is added to this DIT. Therefore, when the DIT is acquired, the interrupt request is sent to the system controller 10 at that point without performing error detection. The system controller 10 receives the interrupt request in step S202 and starts the interrupt processing.

The interrupt processing in this case corresponds to the processing of steps S203 to S205. Step S2
In 03, transi inserted in DIT section
By referring to tion_flag (1 bit), it is determined whether or not the value is “0”.

Here, the transition_flag is stipulated so that either value of "0" or "1" is set according to the insertion condition of DIT, but in actual application, P
The value of "0" or "1" is determined depending on the presence or absence of CR continuity. And the partial TS is P
In the DIT insertion condition where all the contents including CR are changed and discontinuity occurs, transition_fla
'0' is to be set for g. On the other hand, with regard to PCR, while maintaining continuity,
DI for which discontinuity occurs for partial TS
Under the T insertion condition, "1" is set.

PCR (Program Clock Reference)
Is time information serving as a reference for synchronous playback of video / audio, and in the case of the digital satellite broadcast receiver 1 of the present embodiment, for example, TS in the demultiplexer 7
It can be configured to extract, separate, and reproduce.

Then, in step S203, transi
If a negative result is obtained as a result of determining whether or not tion_flag = 0, the process proceeds to step S204. In this case, since the continuity of PCR is maintained before and after the insertion position of DIT in PTS, PC
Execute R continuous processing. That is, based on the acquired PCR, MPEG / MPEG so that continuous video / audio reproduction is continuously performed before and after the insertion position of the DIT.
The control for the decoder 8 is executed. On the other hand, if transition_flag = 1 in step S203 and a negative result is obtained in step S203, the PCR does not have continuity before and after the DIT insertion position. Therefore, in this case, the PCR discontinuous processing is executed. In other words, the video / audio resynchronization is performed based on the PCR extracted after the DIT insertion position, and the control for the MPEG decoder 9 is executed.

When the processing of step S204 or S205 is completed, the system controller 10
The process proceeds to step S206. Step S206
Performs the processing corresponding to the acquisition of PAT, PMT, and SIT shown in FIG. 8 above, for example.

The present invention is not limited to the configurations of the above-described embodiments, but can be modified as appropriate. For example, in the above-described embodiment, the case where the data processing device of the present invention is applied to a digital satellite broadcast receiver is taken as an example. However, in addition to this, for example, recording such that digital data can be recorded and reproduced. The present invention can be applied to the case where data in the partial TS format is transmitted by the IEEE 1394 data interface in a reproducing device or the like. Also, the data to be processed by the data processing device may be data according to a standard other than stream data according to the standard of digital satellite broadcasting. Further, the present invention can be applied to a case where stream data is transmitted by a data interface format other than IEEE 1394 and a case where extraction processing of required additional information is performed.

[0107]

As described above, according to the present invention, the additional information (PAT, PAT) extracted from the stream data (PTS) is used.
Regarding MT, SIT), when comparing the additional information content acquired in the past with the additional information acquired this time, for example, to determine whether or not there is an update, this comparison processing is performed by hardware. Then, when it is determined that there is an update as a result of this comparison, the control means for controlling the data processing is notified. This eliminates the need for the system controller (CPU) to perform comparison processing by software processing. Then, the CPU need only receive the notification based on the comparison result and perform the corresponding process. Therefore,
The processing load on the CPU is significantly reduced. Further, since the comparison process is executed at high speed by hardware, the problem of a decrease in processing speed can be solved.

Further, in the present invention, for example, as in the conventional case, only the version information of about several bits is not the object of comparison, but the entire data structure effective as the additional information,
Alternatively, the contents of a plurality of predetermined information (descriptors) in the structure are compared so that a more accurate comparison result can be obtained. For example, if the entire data structure that is effective as the additional information is compared, a relatively large number of bits are processed. However, in the present invention, since the comparison process is executed at high speed by hardware, this Even if many bits are processed, a sufficiently high processing speed can be obtained.

Further, according to the present invention, it is determined whether the comparison target of the comparison processing is valid or invalid based on the error detection result performed on the additional information acquired this time. Thereby, for example, erroneous additional information having an error can be excluded from the comparison target, so that a more reliable comparison result can be obtained.

Further, in the present invention, DI indicating that discontinuity has occurred in stream data as additional information.
T (discontinuity information) is also extracted and acquired, and the CPU is notified even when this DIT is acquired.
As a result, it becomes possible to reduce the processing load on the CPU regarding the operation to be performed in response to the detection of the discontinuity of the stream data.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a digital satellite broadcast receiver including a data processing device according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating an internal configuration example of an additional information processing unit according to the present embodiment.

FIG. 3 is a table diagram showing a structure of a TS packet header in DIT.

FIG. 4 is a table diagram showing a structure of a PAT section.

FIG. 5 is a table diagram showing a structure of a PMT section.

FIG. 6 is a table showing a structure of a SIT section.

FIG. 7 is a table showing the structure of a DIT section.

FIG. 8 is a flowchart showing the processing operation of the system controller corresponding to the acquisition of PAT, PMT, and SIT in the additional information processing unit.

FIG. 9 is a flowchart showing the processing operation of the system controller corresponding to the acquisition of DIT in the additional information processing unit.

[Explanation of symbols]

1 digital satellite broadcasting receiver, 2 front end part,
3 descrambler, 4 IEEE 1394 communication section, 4
a filter unit, 4b DIT insertion processing unit, 4c SI
T insertion processing unit, 4d transmission / reception unit, 5 storage unit, 6 switch unit, 7 demultiplexer, 8 MPEG decoder, 9 additional information processing unit, 10 system controller, 11 IEEE 1394 bus, 12 parabolic antenna, 21 section processing unit, 22 CRC Check unit, 23 RAM, 24 register, 25 comparator, 2
6 detector, 27 control register, 28
Host interface

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 7/24 F term (reference) 5C025 AA28 BA25 BA27 BA30 DA01 DA04 DA10 5C053 FA20 FA23 GB06 GB38 JA21 LA07 5C059 MA00 RB10 RB16 RC01 RC04 SS02 SS12 UA05 5C063 AB03 AB07 AC01 AC05 AC10 CA11 CA23

Claims (4)

[Claims] 1. An input unit for inputting stream data defined under a standard of a predetermined data interface, and what is to be inserted into the stream data are defined, and required data processing is performed on the stream data. Additional information acquisition means for extracting and acquiring predetermined additional information required for performing, additional information formed by hardware, which has been acquired in the past by the additional information acquisition means and is currently valid, Control for performing the above-mentioned data processing when the comparison result that compares whether the contents of the additional information acquired this time match or not and the comparison result that the comparison means does not match A data processing device comprising: a notification unit that notifies a control unit that executes a process. 2. The comparison means is configured to compare the entire data structure of the additional information or the contents of a predetermined plurality of information in the data structure of the additional information. 1. The data processing device according to 1. 3. The additional information, which is formed by hardware and has an error detection code inserted therein, is used to perform error detection using the error detection code, and based on the error detection result, The data processing apparatus according to claim 1, further comprising: an error detection unit that sets validity / invalidity as the additional information acquired this time to be used by the comparison unit as a comparison target. 4. The notifying means executes control processing for performing the data processing when the additional information acquisition means acquires discontinuity information indicating that the stream data is discontinuous as additional information. The data processing device according to claim 1, wherein the data processing device is configured to make a notification to a control unit that operates.