JP4193303B2 - Information processing apparatus and method, and recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an information processing apparatus and method, and a recording medium, and more particularly, to an information processing apparatus and method, and a recording medium that can increase the encoding rate of a stream by adding data.
[0002]
[Prior art]
For example, in a digital multi-channel broadcasting system using satellites or terrestrial waves, it is desired to enhance various services by transmitting additional data such as EPG (Electronic Program Guide), so-called data broadcasting services.
[0003]
The content of such a data broadcasting service is created in a predetermined description format so that the service is expressed in the receiver as intended by the content creator. For example, MHEG (Multimedia and Hypermedia information coding Experts Group) is one of the description formats, and a content creator creates this content by using an authoring tool of MHEG. In addition, as one of the methods for transmitting contents of such data broadcasting service, a DSM-CC (Digital Storage Media Command and Control) carousel transmission method has been proposed. It is standardized by MPEG (Moving Picture Experts Group) 2-6 (ISO / IEC 18138-6).
[0004]
FIG. 1 shows a configuration example of a conventional multiplexing apparatus 10 using statistical multiplexing.
[0005]
Each of the variable rate encoding units 11-1 to 11-N (hereinafter referred to simply as the variable rate encoding unit 11 if it is not necessary to distinguish between them individually) S1 to SN are input, and each variable rate encoding unit 11 encodes the input signal S at a variable rate and outputs the encoded signal S to the multiplexing unit 12. The multiplexing unit 12 statistically multiplexes the encoded signal S input from each variable rate encoding unit 11 and outputs the signal to an external device.
[0006]
The multiplexing unit 12 also assigns a band corresponding to the coding rate that varies temporally depending on the content of the signal input from each variable rate coding unit 11, for example, from the variable rate coding unit 11. If the sum of the coding rates exceeds the limited transmission capacity of the multiplexed transmission path, a part of the input signal is deleted (discarded) so that the sum does not exceed the transmission capacity. I do.
[0007]
FIG. 2 shows a configuration example of another conventional multiplexer 20. In this multiplexing apparatus, a DSM-CC data encoding unit 21 is further provided in the multiplexing apparatus 10 of FIG.
[0008]
The DSM-CC data encoding unit 21 receives, for example, data D of data broadcasting service content created using an MHEG authoring tool. The DSM-CC data encoding unit 21 encodes the input data D based on the DSM-CC standard, converts it into a section format which is one of MPEG2 transmission formats, and converts it into a transport stream. The transport stream (hereinafter abbreviated as TS) is developed on the carousel and output to the multiplexing unit 12.
[0009]
Next, the operation of the DSM-CC data encoding unit 21 will be described. First, the content data D input to the DSM-CC data encoding unit 21 will be described. This data D has, for example, a directory structure as shown in FIG. In the case of FIG. 3, the data D is provided with a root directory RD corresponding to one broadcasting program at the highest level, to which, for example, a subdirectory SD1 and a subdirectory SD2 corresponding to each scene belong, The subdirectory SD1 has a directory structure to which the lowest files F1 to F3 corresponding to video data or audio data belong. Note that the file F can also belong to the subdirectory SD and the root directory RD.
[0010]
The DSM-CC data encoding unit 21 encodes the content data D having such a directory structure in accordance with DSM-CC, and then forms a section.
[0011]
Next, this section formation process will be described. First, as shown in FIG. 4A, one module (unit for receiving data in the DSM-CC carousel transmission system) associated with the file F in FIG. 3 is finally formed. The section (FIG. 4D) is divided into blocks B of a predetermined size so that the size does not exceed 4 KB (FIG. 4B). Only the last block Bk may be smaller than the size of other blocks B.
[0012]
Next, as shown in FIG. 4C, a DSM-CC header is added to each block B, and each block B is converted into a data structure called DDB (Download Data Block). Finally, a section header and CRC (Cyclic Redundancy Check Code) are added to form a section. The size of this section is 4KB or less. In the following, a section in which the DDB structure is stored is referred to as a DDB section.
[0013]
In this way, a DDB section is formed from each of a plurality of modules constituting one content data D. FIG. 5 shows DDB section 1 to DDB section 3 (FIG. 5) formed based on blocks B1 to B3 (FIG. 5A) divided from module 1 among a plurality of modules 1, 2,. 5 (B)) is shown.
[0014]
Here, the detailed configuration of the DDB section will be described with reference to FIG. As shown in FIG. 6A, “0x3C” (“3C” in hexadecimal notation and “60” in decimal notation) is described in table_id (8 bits) which is the first item (field) of DSMCC_section (). Also, as shown in FIG. 6C, when “0x1003” (2 bytes) is described in the messageId of dsmccDownloadDataHeader (), this DSMCC section is a DDB section.
[0015]
In this DSMCC_section (), in addition to table_id, fields as shown in FIG. 6A are provided with a storage capacity for the bits shown in the figure. For example, in dsmcc_section_length, for example, table_id_extention in which moduleId is described, section_number in which lower 8 bits of blockNumber in Download_Data_Block () (FIG. 6B) are described, and the final section number are described. The length of the part including the last_section_number and the like (the part indicated by the up and down arrows in FIG. 6A) is described. The maximum length is 4093 (bytes). Of the DDB sections constituting the module, “0x00” is described in section_number of the first DDB section.
[0016]
Download_Data_Block () shown in FIG. 6A has a DDB structure as shown in FIG. As shown in Fig. 6C, fields such as protocolDiscriminator, dsmccType, messageId ("0x1003"), downloadId, adaptationLength, messageLength, dsmccadaptationHeader are shown in the header of dsmccDownloadDataHeader () that is the header of the head position. The storage capacity for each byte is allocated and provided. For example, the adaptationLength describes the length of the dsmccadaptationHeader, and the messageLength describes the length from the dsmccadaptationHeader to the end of the blockData of Download_Data_Block ().
[0017]
Download_Data_Block () in FIG. 6B is provided with fields as shown in FIG. 6B, in addition to dsmccDownloadDataHeader (), with a storage capacity of bytes shown in the figure assigned. For example, the block number is described in blockNumber, and the lower 8 bits of this block number are described in section_number of DSMCC_section () in FIG.
[0018]
In the DSM-CC data carousel method, in addition to the DDB section as described above, the header and CRC are added to the DII section with DII (Download Info Indication) structure header and CRC, and DSI (Download Server Initiate) structure data. A DSI section to which a CRC is added is further formed. DII and DSI describe control information necessary for correctly receiving the DDB section.
[0019]
FIG. 7 shows the structure of the DII section. As shown in FIG. 7A, “0x3B” is described in the table_id (8 bits) of DSMCC_section (), and “0x1002” is described in the messageId of DsmccMessageHeader () as shown in FIG. 7C. If so, this DSMCC section is a DII section.
[0020]
In this DSMCC_section (), in addition to table_id, fields as shown in FIG. 7A are provided with storage capacity for bits shown in the figure. For example, table_id_extention describes the lower 16 bits of transaction_id.
[0021]
DownloadInfoIndication () shown in FIG. 7A has a DII structure as shown in FIG. This DownloadInfoIndication () includes dsmccMessageHeader (), downloadId, blocksize, windowsize, ackPeriod, tCDownloadWindow, tCDownloadSenario, compatibilityDescriptor (), and numberOfModules, and moduleId, moduleSize for each module (in this example, for each of M modules) , ModuleVersion, moduleInfoLength, and moduleInfoByte fields are allocated with a storage capacity of bytes shown in the figure. For example, blocksize is the block size, tCDownloadSenario is the carousel timeout value, numberOfModules is the number of modules M, moduleSize for each module is the module size, and moduleVersion Contains the version of the module.
[0022]
In the dsmccMessageHeader () shown in FIG. 7B, each field is provided with a storage capacity corresponding to the bytes shown in the figure, as shown in FIG. 7C. For example, “0x1002” is described in the messageId.
[0023]
When the content has a directory structure as shown in FIG. 3, a plurality of DIIs associated with the subdirectory SD are provided.
[0024]
The structure of the DSI section has basically the same structure as the DDB section and DII section, so illustration and detailed description thereof are omitted, but “0x3B” is described in the table_id of the DSMCC_section (). In addition, “0x1006” is described in the messageId of dsmccMessageHeader ().
[0025]
When the content has a directory structure as shown in FIG. 3, a plurality of DIIs associated with the subdirectory SD are provided. In this case, information for linking to the DII is described in the DSI. The
[0026]
Returning to FIG. 2, the DSM-CC data encoding unit 21 forms the DDB section, the DII section, and the DSI section as described above, and then converts them into a TS as shown in FIG. .
[0027]
Next, as shown in FIG. 5D, the DSM-CC data encoding unit 21 pastes the converted TS on the surface of a virtual rotating body called a carousel, as shown in FIG. As described above, the TS is output to the multiplexing unit 12 at a timing corresponding to the rotation of the carousel. The carousel is continuously rotated, and the TS (TS constituting each section arranged on the carousel) is periodically output to the multiplexing unit 12.
[0028]
The TS output from the DSM-CC data encoding unit 21 is multiplexed together with the TS from the variable rate encoding unit 11 in the multiplexing unit 12 and output to an external device.
[0029]
The DSM-CC data encoding unit 21 operates as described above.
[0030]
[Problems to be solved by the invention]
By the way, as shown in FIG. 5E, the DSI section, DII section, and DDB section are output to the multiplexing unit 12 at a timing corresponding to the rotation of the carousel. Except for cases, the data is output according to a predetermined encoding rate set in advance. That is, it is output at a constant rate.
[0031]
Accordingly, even when the sum of the encoding rates in the variable rate encoding unit 11 and the DSM-CC data encoding unit 21 does not reach the transmission capacity of the allocated band, for example (the encoding rate Data is transmitted at a rate of only the sum. As a result, there is a problem that the transmission band is not efficiently used.
[0032]
The present invention has been made in view of such a situation, and makes it possible to efficiently use a transmission band.
[0033]
[Means for Solving the Problems]
The information processing apparatus according to claim 1, a first measuring unit that measures an input time of section data, a second measuring unit that measures an input time of a command to add section data to a stream, Based on the calculation means for calculating the difference between the input time measured by the first measurement means and the input time measured by the second measurement means, the difference calculated by the calculation means, and the cycle of the carousel It is characterized by comprising a determining means for determining the data type of the section to be added, and an adding means for adding the section data determined by the determining means to the stream.
[0035]
The section can be a DDB section.
[0036]
The section can be a DII section or a DSI section.
[0038]
Deletion means for deleting section data from the stream can be further provided.
[0039]
The information processing method according to claim 5 includes a first measurement step of measuring an input time of section data, a second measurement step of measuring an input time of a command for adding section data to a stream, A calculation step for calculating a difference between the input time measured by the process of the first measurement step and the input time measured by the process of the second measurement step; a difference calculated by the process of the calculation step; based on the cycle, a determination step of determining a type of data to be added section, the data types of sections determined by the processing of the determining step, characterized in that it comprises an additional step of adding to the stream.
[0040]
The recording medium according to claim 7 is a first measurement step of measuring an input time of section data, a second measurement step of measuring an input time of a command for adding section data to a stream, The calculation step for calculating the difference between the input time measured by the process of the measurement step and the input time measured by the process of the second measurement step, the difference calculated by the process of the calculation step, and the cycle of the carousel And determining the type of data of the section to be added, and adding the type of section data determined by the processing of the determining step to the stream.
[0041]
In the information processing apparatus according to claim 1, the information processing method according to claim 5 , and the recording medium according to claim 6 , the input time of the section data is measured , and the section data is added to the stream. The command input time is measured, the difference between each measured input time is calculated, and based on the calculated difference and the carousel cycle, the data type of the section to be added is determined, and the determined type The data of the section is added to the stream.
[0042]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 8 shows a configuration example of the multiplexing apparatus 100 to which the present invention is applied. In this multiplexing device, a data adjustment unit 101 is provided between the DSM-CC data encoding unit 21 and the multiplexing unit 12 of the multiplexing device 20 in FIG. 2, and the data adjustment unit 101 and the multiplexing unit 12 are connected. A control unit 102 to be connected is provided. The other configuration is the same as that in FIG.
[0043]
TS that constitutes the DII section, DSI section, and DDB section is input from the DSM-CC data encoding unit 21 to the data adjustment unit 101 at a timing corresponding to the rotation of the carousel. The data adjustment unit 101 adds or deletes the DDB section to the input TS in accordance with a command from the control unit 102 and outputs the DDB section to the multiplexing unit 12. Thereby, the encoding rate in the DSM-CC data encoding unit 21 is increased or decreased.
[0044]
The control unit 102 controls the multiplexing process of the multiplexing unit 12 and also the difference between the sum of the TS coding rates output from the variable rate coding unit 11 and the data adjustment unit 101 and the allocated transmission capacity. And, based on the monitoring result, command the data adjustment unit 101 to add and delete the DDB section.
[0045]
FIG. 9 shows a configuration example of the data adjustment unit 101. The TS from the DSM-CC data encoding unit 21 input to the data adjustment unit 101 is input to the analysis unit 111 and the switch 112 of the data adjustment unit 101.
[0046]
The analysis unit 111 extracts and analyzes the TS corresponding to the DII section from the input TS, for example, the module ID, the number of the modules existing on one carousel (hereinafter referred to as the occurrence frequency). ), And the period of the carousel, etc., and among the input TS, the input time of the TS constituting the DDB section is measured to generate a module table (FIGS. 15 and 16), which will be described later, and the increase unit 113 and the reduction unit 114.
[0047]
The increase unit 113 adds a predetermined module (DDB section) to the TS from the DSM-CC data encoding unit 21 input via the switch 112 based on the module table input from the analysis unit 111 and the like. Then, the data is output to the multiplexing unit 12 via the switch 115.
[0048]
The reduction unit 114 deletes a predetermined module (DDB section) from the TS input via the switch 112 based on the module table or the like input from the analysis unit 111, and the multiplexing unit via the switch 115 12 is output.
[0049]
The control unit 116 is connected to the control unit 102, receives a command from the control unit 102, and controls the switch 112, the increase unit 113, the reduction unit 114, and the switch 115 according to the command.
[0050]
FIG. 10 shows a configuration example of the increase unit 113. TS from the DSM-CC data encoding unit 21 input via the switch 112 is input to the buffer 121, and the buffer 121 temporarily stores the input TS and receives a command from the determination unit 122. Is output to the adding unit 123 at a timing based on the above.
[0051]
The determination unit 122 receives a module table from the analysis unit 111 and a data increase command from the control unit 116. The determination unit 122 determines the type of module to be added based on the input time of the command from the control unit 116, the module table from the analysis unit 111, and the like, reads the determined module from the storage unit 124, and adds Output to the unit 123 or command the buffer 121 to output timing of the module.
[0052]
The adding unit 123 adds the module supplied from the determining unit 122 to the TS input at a predetermined timing from the buffer 121 and outputs the module to the multiplexing unit 12 via the switch 115.
[0053]
The storage unit 124 stores in advance all the modules input to the data adjustment unit 101 (all the modules output from the multiplexing apparatus 100), and outputs the designated module to the determination unit 122.
[0054]
FIG. 11 shows a configuration example of the reduction unit 114. The TS from the DSM-CC data encoding unit 21 is input to the deletion unit 131 of the reduction unit 114 via the switch 112. The deletion unit 131 deletes the module specified by the determination unit 132 from the input TS and outputs the module to the multiplexing unit 12 via the switch 115. When a data reduction command is input from the control unit 116, the determination unit 132 determines a module to be deleted based on the module table supplied from the analysis unit 111 and notifies the deletion unit 131 of the module.
[0055]
Next, the operation of the data adjustment unit 101 will be described with reference to the flowchart of FIG. In this example, one module A and two modules B arranged in the carousel as shown in FIG. 13 (shown as modules B1 and B2 in the figure, they are the same module B). A total of four modules of one module C are input to the data adjustment unit 101 in the form of TS (exactly, in addition to the DDB section constituting each module, the DII section and the DSI section are in the form of TS. And is input to the data adjustment unit 101). In the case of this example, the carousel rotates to the left, and module A is input first, and thereafter, module B1, module C, and module B2 are sequentially cycled at the timing corresponding to the cycle of the carousel. Input to the adjustment unit 101.
[0056]
As shown in FIG. 5D, the DDB section is generated from the blocks divided from each module. Therefore, on the carousel, DDB sections generated from the same module are in one unit ( Group). That is, each module shown in FIG. 13 indicates a group of a plurality of DDB sections generated from each module.
[0057]
In this example, DownloadInfoIndication () having the configuration shown in FIG. 14B is stored in the DII section instead of the configuration shown in FIG. 7B. In this DownloadInfoIndication (), fields of moduleID, module_count, TP_count, and module_time are provided for each module, and predetermined information of 2 bits is described (hereinafter described in each of these fields). When information does not need to be individually distinguished, they are collectively referred to as module information). In this example, DownloadInfoIndication () includes module information A, B, and C.
[0058]
The module_ID of the module information A is the ID of the module A, the module_count is the frequency of occurrence of the module A (the number existing on the carousel), that is, “1”, and the TP_count is the module A. The number of TS packets and the module_time describe the period of module A (time TA).
[0059]
Similarly to the module information A, the module information B and the module information C also describe information about the module B and the module C. For example, in this example, two modules B are arranged in the carousel. Therefore, “2” is described in module_count of module information B.
[0060]
This DownloadInfoIndication () is also provided with a carousel_time field, in which the carousel period (time TW) is described. The carousel cycle is determined by the amount of data on the carousel and the coding rate.
[0061]
When the TS as described above is input from the DSM-CC encoding unit 21, in step S11, the analysis unit 111 of the data adjustment unit 101 extracts a DII section from the TS. Specifically, the analysis unit 111 describes “0x3B” in the table_id of the DSMCC_section () of the section configured by the input TS (FIG. 7B), and “0x1002” in the messageId of DsmccMessageHeader (). ”Is detected (FIG. 7C), and the DII section is detected and extracted.
[0062]
Next, in step S12, the analysis unit 111 obtains the module information A to the module information C described in the DownloadInfoIndication () and the carousel cycle (time TW) (FIG. 14B) from the extracted DII section. get. The analysis unit 111 supplies the acquired carousel cycle (time TW) to the increase unit 113 and the reduction unit 114.
[0063]
In step S13, the analysis unit 111 creates a table as shown in FIG. 15 based on the module ID described in moduleId and the occurrence frequency of the module described in module_count among the module information acquired in step S12. (Hereinafter, this table is referred to as a module table). In this example, since the occurrence frequency of module B is “2”, two columns in which the ID of module B is described are provided.
[0064]
Next, in step S14, the analysis unit 111 starts measuring the input time of the input DDB section, adds the measurement result to the module table of FIG. 15, and generates the module table shown in FIG. The module table of FIG. 16 shows the first input times (time t1, t2, t4, t3) of modules A, B (B1), B (B2), and C. The analysis unit 111 supplies the generated module table (FIG. 16) to the increase unit 113 and the reduction unit 114.
[0065]
The DDB sections are arranged on the carousel so that DDB sections generated from the same module form one unit. Therefore, here, the input time of the first DDB section (more precisely, the input time of the TS configuring the first DDB section) among the DDB sections constituting each module is measured and described in the module table. In addition, since “0x00” is described in section_number of DSMCC_section () (FIG. 6A) of the first DDB section of each module, the analysis unit 111 detects the DDB module in which it is described. Then, the input time is measured.
[0066]
In addition, since the carousel continuously rotates in this example, the modules AB1, C, and B2 (FIG. 13) are periodically input to the data adjustment unit 101, but the analysis unit 111 Is input, the input time is measured, overwritten in the “input time” field of the module table (FIG. 16), and supplied to the increase unit 113 and the reduction unit 114. That is, each time a module is input to the module table, the column “input time” is updated and supplied to the increase unit 113 and the reduction unit 114.
[0067]
In step S15, the control unit 116 stands by until an instruction to increase or delete data is input from the control unit 102. If an increase in data is instructed, the process proceeds to step S16. The control unit 102 monitors how small (difference) the sum of the encoding rates in the variable rate encoding unit 11 and the DSM-CC data encoding unit 21 is relative to the allocated transmission capacity. When the difference is equal to or greater than a predetermined magnitude, a command to increase data is output to the control unit 116 of the data adjustment unit 101.
[0068]
In step S16, the control unit 116 notifies the increase unit 113 that there has been a data increase instruction, and controls the switch 112 and the switch 115. As illustrated in FIG. The TS from the DSM-CC data encoding unit 21 is input to the increasing unit 113 and the output of the increasing unit 113 is input to the multiplexing unit 12.
[0069]
Next, in step S17, the increase unit 113 starts data increase processing. The details of this processing are shown in the flowchart of FIG.
[0070]
In step S31, the determination unit 122 of the increase unit 113 receives the time t0 when the data increase command is input from the control unit 116 (hereinafter referred to as a request time) and the latest module table ( The difference from the input time of each module described in the column “input time” in FIG. 16) is calculated.
[0071]
In step S32, the determination unit 122 calculates the calculation result closest to the half time of the carousel cycle TW (step S12 in FIG. 12) supplied from the analysis unit 111 among the calculation results in step S31. Detect modules. As shown in FIG. 18, the processing of step S31 and step S32 is as follows. The input time t1 is 14:30, the input time t2 is 14:40, the input time t3 is 14:50, and the input time t4 is , 15:00, the request time t0 is 15:10, and the carousel period (time TW) is 46 minutes.
[0072]
The difference between time t0 and time t1 is 40 minutes (= 15: 10-14: 30), and the difference from time t2 is 30 minutes (= 15: 10-14: 40) The difference from t3 is 20 minutes (= 15: 10-14: 50), and the difference from time t4 is 10 minutes (= 15: 10-15: 00). In this example, the carousel cycle TW is 46 minutes, and the calculation result closest to 23 minutes, which is 1/2 of the carousel period, is 20 minutes, which is the difference from time t3. That is, in this example, module C is detected.
[0073]
Next, in step S <b> 33, the determination unit 122 reads out the DDB section constituting the module C detected in step S <b> 32 from the storage unit 124 and supplies it to the addition unit 123. In step S34, the determination unit 122 controls the buffer 121, and the module C is added to the position on the carousel corresponding to the request time t0 as illustrated in FIG. To output.
[0074]
In step S35, the adding unit 123 places the DDB section constituting the module C supplied from the determining unit 122 to the TS input from the buffer 121 at a position corresponding to the request time t0 as illustrated in FIG. to add. That is, the module C is added to a position farthest from the position of the module C arranged in advance (a position on the diagonal of the carousel).
[0075]
In this way, the module C to be added is arranged at a position farther from the module C that is arranged in advance, so that the cycle is performed in the order of the module A, the module B1, the module C, the module B2, and the module C. Therefore, it is output to the multiplexing unit 12. That is, the module C is output at shorter intervals and received by the receiving side at shorter intervals. Usually, there are multiple sections on the carousel that should be received with a short waiting time, such as the DII section containing the module information and the DDB section containing the first scene when receiving the data broadcasting service. They are arranged on the carousel as far as possible from each other.
[0076]
As described above, when the DDB section is added, the process ends, the process returns to step S15 in FIG. 12, and waits until the next command is input. Thus, when the sum of the coding rates in the variable rate coding unit 11 and the DSM-CC data coding unit 21 does not reach the allocated transmission capacity, data (in this example, a DDB section) is added. Thus, since the encoding rate is increased, the band is efficiently used. Further, since the module to be added is arranged as far as possible from the module arranged in advance, the module is output at a short interval. As a result, the waiting time of the user can be shortened.
[0077]
In step S15, when a command to delete data is input from the control unit 102, the process proceeds to step S18. The control unit 102 monitors the difference between the sum of the encoding rates of the variable rate encoding unit 11 and the DSM-CC data encoding unit 21 and the allocated transmission capacity, and the difference is a predetermined amount. Or less (for example, when the sum of the encoding rates exceeds the transmission capacity), a command to delete data is output to the control unit 116 of the data adjustment unit 101.
[0078]
In step S18, the control unit 116 notifies the reduction unit 114 that the deletion of data has been instructed, controls the switch 112 and step S115, connects the switch 112 and the switch 115 to the reduction unit 114, and sets the DSM. -The TS from the CC data encoding unit 21 is input to the reduction unit 114, and the output of the reduction unit 114 is input to the multiplexing unit 12.
[0079]
Next, in step S19, the reduction unit 114 deletes a predetermined DDB section from the TS input from the DSM-CC data encoding unit 21. Specifically, for example, the determination unit 132 of the reduction unit 114 refers to the module table supplied from the analysis unit 111, detects a module (for example, module B) having two or more occurrence frequencies, Control to delete the detected module from the input TS. The TS from which a predetermined module has been deleted is output to the multiplexing unit 12 via the switch 115.
[0080]
Then, it returns to step S15 and waits until the next command is input. As described above, when the sum of the coding rates in the variable rate coding unit 11 and the DSM-CC data coding unit 21 exceeds the allocated transmission capacity, the module having the occurrence frequency of 2 or more is deleted. Thus, since the encoding rate is reduced, for example, it is possible to prevent a module having a single occurrence frequency from being deleted and providing a service corresponding to that module.
[0081]
In the above description, the case where there is one DSM-CC data encoding unit 21 as shown in FIG. 8 has been described as an example. However, as shown in FIG. 20, a plurality of DSM-CC data encoding units 21 are provided. Even in the case of being provided, the data adjustment as described above is performed by providing the data adjustment unit 101 corresponding to the DSM-CC data encoding unit 21. In this case, the control unit 102 controls the plurality of data adjustment units 101.
[0082]
In the above description, the case of adding or deleting a DDB section has been described as an example. However, a DSI section or a DII section can be added or deleted.
[0083]
In the above description, the module information is acquired from the DII section having the configuration shown in FIG. 14 as an example. However, the module information is acquired from the DDI section having the configuration shown in FIG. It can also be used in the invention. A method for acquiring module information from a DDI section having the configuration shown in FIG. 7 is disclosed in Japanese Patent Application No. 11-051862.
[0084]
The series of processes described above can be executed by hardware, but can also be executed by software. A multiplexing apparatus that executes a series of processing by software will be described.
[0085]
The multiplexing device 501 in FIG. 21 is configured by a computer, for example. An input / output interface 516 is connected to a CPU (Central Processing Unit) 511 via a bus 515, and the CPU 511 receives a command from an input unit 518 such as a keyboard and a mouse via the input / output interface 516. When input, it is stored in a recording medium such as a ROM (Read Only Memory) 512, a hard disk 514, or a magnetic disk 531, an optical disk 532, a magneto-optical disk 533, or a semiconductor memory 534 mounted in the drive 520. The program is loaded into a RAM (Random Access Memory) 513 and executed. Further, the CPU 511 outputs the processing result to a display unit 517 such as an LCD (Liquid Crystal Display) via the input / output interface 516 as necessary. The program is stored in advance in the hard disk 514 or the ROM 512 and provided to the user integrally with the multiplexing device 501, or as a package medium such as the magnetic disk 531, the optical disk 532, the magneto-optical disk 533, and the semiconductor memory 534. It can be provided to the hard disk 514 via the communication unit 519 from a satellite, a network, or the like.
[0086]
In the present specification, the step of describing the program provided by the recording medium is not limited to the processing performed in chronological order according to the described order, but is not necessarily performed in chronological order. It also includes processes that are executed individually.
[0087]
Further, in the present specification, the term “system” means an overall apparatus composed of a plurality of apparatuses and means.
[0088]
【The invention's effect】
According to the information processing device according to claim 1, the information processing method according to claim 5 , and the recording medium according to claim 6 , the periodic data is added to the stream. It can be used efficiently.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration example of a conventional multiplexing apparatus 10;
FIG. 2 is a block diagram illustrating a configuration example of a conventional multiplexing device 20;
FIG. 3 is a diagram illustrating a directory structure of content.
FIG. 4 is a diagram illustrating a section structure.
FIG. 5 is a diagram for explaining a carousel transmission method;
FIG. 6 is a diagram illustrating the configuration of a DDB section.
FIG. 7 is a diagram illustrating a configuration of a DII section.
FIG. 8 is a block diagram showing a configuration example of a multiplexing apparatus 100 to which the present invention is applied.
9 is a block diagram illustrating a configuration example of a data adjustment unit 101 in FIG.
10 is a block diagram illustrating a configuration example of an increase unit 113 in FIG. 9;
11 is a block diagram illustrating a configuration example of a reduction unit 114 in FIG. 9;
12 is a flowchart illustrating the operation of the data adjustment unit 101. FIG.
FIG. 13 is a diagram for explaining data addition processing;
FIG. 14 is another diagram illustrating the configuration of a DII section.
FIG. 15 is a diagram illustrating a module table.
FIG. 16 is another diagram for explaining a module table;
FIG. 17 is a flowchart for explaining data increase processing;
FIG. 18 is another diagram for explaining data increase processing;
FIG. 19 is another diagram for explaining data increase processing;
FIG. 20 is a block diagram showing another configuration example of the multiplexing apparatus 100 to which the present invention is applied.
FIG. 21 is a block diagram illustrating a configuration example of a multiplexing device 501.
[Explanation of symbols]
101 data adjustment unit, 102 control unit, 111 analysis unit, 112 switch, 113 increase unit, 114 reduction unit, 115 switch, 116 control unit, 121 buffer, 122 determination unit, 123 addition unit, 124 storage unit, 131 deletion unit, 132 decision part

Claims (6)

In an information processing apparatus that statistically multiplexes a variable-rate encoded stream that constitutes data of sections arranged in a carousel in a DSM-CC transmission system ,
First measuring means for measuring an input time of data of the section;
Second measuring means for measuring an input time of a command for adding the section data to the stream;
Calculating means for calculating a difference between the input time measured by the first measuring means and the input time measured by the second measuring means;
Determining means for determining the type of data of the section to be added based on the difference calculated by the calculating means and a cycle of the carousel;
An information processing apparatus comprising: an adding unit that adds the data of the section of the type determined by the determining unit to the stream. The information processing apparatus according to claim 1 , wherein the section is a DDB section. The information processing apparatus according to claim 1 , wherein the section is a DII section or a DSI section. The information processing apparatus according to claim 1, further comprising: a deletion unit that deletes the data of the section from the stream. In an information processing method of an information processing apparatus that statistically multiplexes a variable rate encoded stream that constitutes data of a section arranged in a carousel in a DSM-CC transmission system
A first measurement step of measuring an input time of data of the section ;
A second measuring step of measuring an input time of a command for adding the section data to the stream;
A calculation step for calculating a difference between the input time measured by the process of the first measurement step and the input time measured by the process of the second measurement step;
A determination step of determining a type of data of the section to be added based on the difference calculated by the processing of the calculation step and a cycle of the carousel;
An information processing method comprising: an adding step of adding, to the stream, the data of the section of the type determined by the processing of the determining step. A program for information processing that statistically multiplexes a variable-rate encoded stream that constitutes data of a section arranged in a carousel in a DSM-CC transmission system ,
A first measurement step of measuring an input time of data of the section ;
A second measuring step of measuring an input time of a command for adding the section data to the stream;
A calculation step for calculating a difference between the input time measured by the process of the first measurement step and the input time measured by the process of the second measurement step;
A determination step of determining a type of data of the section to be added based on the difference calculated by the processing of the calculation step and a cycle of the carousel;
A recording medium on which a program for causing a computer to execute processing is recorded, comprising: an adding step of adding, to the stream, the data of the section of the type determined by the processing of the determining step.

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