JP6676810B2 - Digital television broadcasting system and its transmitting device and receiving device - Google Patents

Description

  The present invention relates to a digital television broadcasting system and a transmitting device and a receiving device thereof.

  Currently, digital television broadcasting mainly uses HDTV (High Definition Television) video signals with a horizontal pixel count of 1920 or 1440 and a vertical pixel count of 1080, but demands for even higher definition video distribution It was started. For this reason, the standardization of ultra-high-definition television broadcasting by 4K (3840 x 2160) or 16K (7680 x 4320) 8K UHDTV (Ultra High Definition Television) with 4 times (3840 x 2160) screen pixels compared to HDTV Is underway.

  By the way, in the current terrestrial digital television broadcasting, a section format table called CDT (Common Data Table) is applied to transmission of service logo data such as a logo used in a program column. ARIB TR-B14 Version 5.9, Volume 5.4 states that in the CDT format transmission, regarding the section_number field, "Sections from 0 to the number indicated by last_section_number exist without omission. In the case of service logo data transmission, The logo of each size is transmitted in the section of section_number that matches the logo_type value. " This means that when logo data having a certain logo_type value is transmitted, all types of logo data from 0 to that logo_type value are transmitted in units of one section without exception.

"Digital Terrestrial Television Broadcasting Operation Regulations" ARIB TR-B14 5.9 Edition Revised on July 03, 2015 Part 1

  In the transmission method of logo data in digital television broadcasting described above, the required value other than 0 cannot transmit logo data of a size exceeding one section, in other words, a size that extends over multiple sections. There is a problem that it is not possible to select and transmit only the logo_type logo data. For this reason, when digital television broadcasting is made ultra-high definition, expandability, flexibility, and transmission efficiency of logo data operation are impaired.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a digital television broadcasting system capable of expanding the operation of logo data, and improving flexibility and transmission efficiency, when transmitting an ultra-high definition video, and a transmission device and a reception device thereof. It is.

  The digital television broadcasting system according to the embodiment has a size exceeding one section of an MH-CDT (MH-Common Data Table) and is capable of multiplex transmission of an arbitrary number of different types of logo data for one logo identification. A John broadcasting system, comprising a transmission system and a reception system. The transmission system, the logo data, the logo identification, the module type for each logo type, the modularized logo data is divided and the MH-CDT section number of the MH-CDT set in advance for each logo type Are arranged in a plurality of sections, and arrangement information indicating a correspondence relationship between the type of the logo data and the MH-CDT section number is set in a data module area of the MH-CDT section, and the MH-CDT is multiplexed with a broadcast signal. And send it out. The receiving system receives the broadcast signal, acquires the MH-CDT from the received broadcast signal, acquires the arrangement information from a data module area of the acquired MH-CDT, and based on the arrangement information, Get any type of logo data from multiple MH-CDT sections of MH-CDT.

  The digital television broadcasting transmitting apparatus according to the embodiment can multiplex and transmit an arbitrary number of different types of logo data for one logo identification with a size exceeding one section of an MH-CDT (MH-Common Data Table). Used in a digital television broadcasting system, the logo data, the logo identification, a module unit for modularizing each logo type, and the MH-CDT by dividing the logo data modularized by the module unit The MH-CDT section number is arranged in advance in a plurality of sections of the MH-CDT section number set for each type of the logo, and the arrangement information indicating the correspondence between the type of the logo data and the MH-CDT section number is data of the MH-CDT section. MH-CDT sectioning section set in the module area, and multiplexing to multiplex the MH-CDT generated by the MH-CDT sectioning section into a broadcast signal Comprising the door, it transmits a broadcast signal obtained by the multiplexing unit.

  The digital television broadcast receiving apparatus according to the embodiment can multiplex and transmit an arbitrary number of different types of logo data for one logo identification with a size exceeding one section of an MH-CDT (MH-Common Data Table). Used in digital television broadcasting systems, the logo data is identified by the logo, modularized for each logo type, and the modularized logo data is divided and set in advance for each of the MH-CDT logo types. Arranged in a plurality of sections of the MH-CDT section number, set the arrangement information indicating the correspondence between the type of the logo data and the MH-CDT section number in the data module area of the MH-CDT section, Corresponding to a transmitting device that multiplexes the broadcast signal with a broadcast signal and sends the broadcast signal. The receiving unit receives the broadcast signal. -Acquire the CDT, acquire the arrangement information from the acquired data module area of the MH-CDT, and acquire any type of logo data from a plurality of MH-CDT sections of the MH-CDT based on the arrangement information. And a logo data acquisition unit for performing the operation.

FIG. 1 is an exemplary block diagram illustrating a configuration of a broadcasting transmitter of a digital television broadcasting system according to a first embodiment. FIG. 2 is a diagram for explaining an area for storing a processing result of a logo data module unit of the transmission device shown in FIG. 1. FIG. 2 is a diagram showing a data structure of a CDT used in a CDT sectioning unit of the transmitting apparatus shown in FIG. FIG. 2 is a diagram showing a data structure of a logo data distribution descriptor of the transmission device shown in FIG. 1. FIG. 1 is a block diagram showing a configuration of a broadcast receiving device of a digital television broadcasting system according to a first embodiment. 6 is a flowchart for explaining a processing operation regarding logo data of the receiving device shown in FIG. 5. FIG. 5 is a block diagram showing a configuration of a broadcast transmitting device of a digital television broadcasting system according to the first embodiment when applied to TLV / MMT and in the second and third embodiments. FIG. 8 is a diagram showing a data structure obtained by extending an MH-logo transmission descriptor in the transmitting device shown in FIG. 7. 13 is a flowchart for explaining a processing operation of the broadcast transmitting device of the digital television broadcasting system according to the third embodiment. FIG. 10 is a diagram showing a data structure related to data_module_byte in the processing operation shown in FIG. 9. FIG. 10 is a diagram showing another data structure related to data_module_byte in the processing operation shown in FIG. 9.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
Hereinafter, a digital television broadcasting system according to the first embodiment will be described with reference to FIGS.

  FIG. 1 is a block diagram showing a configuration of a broadcasting transmitter of the digital television broadcasting system according to the present embodiment. The broadcast transmitting apparatus inputs, for example, logo data used in a program display field such as an EPG (Electronic Program Guide) and logo management information for managing a logo of the logo data, and outputs a logo data module 11 , A CDT sectioning unit 12, a logo data distribution descriptor generating unit 13, a logo transmission descriptor generating unit 14, an SDT (Service Definition Table) sectioning unit 15, and a multiplexing unit 16 for a video signal, an audio signal, a PSI ( It is multiplexed with MPEG-2_TS (Transport Stream) (hereinafter, TS) together with Program Specific Information (SI) and Service Information (SI) other than CDT and SDT, and transmission path coding such as error correction coding and modulation (not shown) ) And transmit it to the service area as a broadcast signal.

  Here, in the transmission method of the service logo data of digital television broadcasting, based on ARIB TR-B14 5.4.1.2, a section type table called CDT (Common Data Table) is used, and the logo type ( Logo management information indicating the correspondence between the logo_type) and the section to be transmitted is defined as a new descriptor, and transmitted together with the logo data.

  Usually, the logo used for broadcasting differs for each broadcasting channel (service). For this reason, a logo identification (hereinafter, logo_id) for identification and management by the receiver is given to each logo data. In addition, the same logo_id is assigned to logo data of a plurality of types of sizes having the same design and color, but having different numbers of pixels due to a difference in an assumed receiver and its application, etc., and each type has a logo type ( Hereinafter, it is distinguished by logo_type). The logo_id is updated and managed by a version number (hereinafter, logo_version).

  The transmitted logo data is sent to the logo data module 11 together with logo_id, logo_type, and logo_version, which are logo management information. The logo data modularizing unit 11 compresses the input logo data and, for each logo_id and logo_type, logo data having a data structure specified in FIG. 2 (quoted from Table 5-15 in 5.4.1.2 of ARIB TR-B14). Store them in an area called a module. This logo data module has a data_size field of 16 bits, but cannot store 64 kbytes of data in the CDT section.

  The logo data module is sent to the CDT sectioning section 12 by the logo data module forming section 11. The CDT sectioning section 12 distributes the logo data module into a plurality of sections of the CDT and transmits the section to the multiplexing section 16. Here, the CDT has a data structure as shown in FIG. 3 (quoted from Table 5-14 in 5.4.1.2 of ARIB TR-B14). The CDT is identified for each download data identification (hereinafter, download_data_id). One section of the CDT has a maximum size of 4 kbytes indicated by the section_length field, and the CDT can be divided into a maximum of 256 sections and transmitted.

  The logo management information logo_id, logo_type, and logo_version are also sent to the logo data distribution descriptor generation unit 13 and the logo transmission descriptor generation unit 14. The logo data distribution descriptor generation unit 13 generates a logo data distribution descriptor indicating the correspondence between the logo_type and the CDT section to be distributed for each logo data, sends the generated logo data distribution descriptor to the CDT sectioning unit 12, and outputs the CDT descriptor area. To place. In addition, the logo transmission descriptor generation unit 14 sets 0x01 when the CDT transmission method 1 is separately specified in the logo transmission type (logo_transmission_type), and stores the logo data of the logo identification (logo_id) and the logo version number (logo_version). A logo transmission descriptor is generated by adding a download data identification (download_data_id) together with the management information. By setting download_data_id to the same value as download_data_id of CDT, it is possible to specify logo data of CDT transmission corresponding to a certain broadcast channel (service). The SDT sectioning unit 15 arranges the logo transmission descriptor in the SDT descriptor area for each service_id specifying a broadcast channel, transmits the logo transmission descriptor to the multiplexing unit 16, and performs TS multiplexing together with the CDT section data.

  When the size of data for each logo_type stored in the logo data module is within 4 kbytes of one section, transmission can be performed using one section. However, when logo data with a large number of pixels is transmitted, for example, in 4K or 8K broadcasting, the size of the logo data may exceed 4 kbytes. Also, in ultra high definition digital broadcasting, if you do not use the logo_type used in terrestrial digital broadcasting that has a small number of pixels, you want to select only a somewhat large type logo and transmit it in any order Is also conceivable. For these reasons, the "logo of each size is transmitted as it is in the section of section_number that matches the" logo_type "value, which is determined by the operation regulations of terrestrial digital broadcasting. "Rule cannot be used. Therefore, in the present embodiment, the logo data distribution descriptor is defined so that the CDT can be transmitted even in such a case. The data structure of the logo data distribution descriptor is as shown in FIG. 4, for example.

The logo data module identified by logo_type shall be divided into CDT sections with consecutive section numbers and transmitted, and the first section number shall be described in the start_section_number field, and the number of section divisions for transmitting the logo data module shall be specified. Describe in the numbers_of_sections field. For example, suppose that two types of logo_type logo data are transmitted, and that the logo_type of logo_type = 0x05 is section number 0, and that the logo_type of 10,000 byte logo data is tentatively 0x06, for a total of three sections of 4000 bytes, 4000 bytes, and 2000 bytes. It is divided and transmitted in order from section number 1. in this case,
logo_type = 0x05, start_section_number = 0x00, numbers_of_sections = 0x01
logo_type = 0x06, start_section_number = 0x01, numbers_of_sections = 0x03
It may be described. Then, this logo data distribution descriptor is arranged and transmitted in the descriptor area of the CDT. The transmission system of these series of logo data is as shown in FIG.

  On the other hand, when the corresponding broadcast receiving apparatus detects that the logo transmission descriptor is arranged in the descriptor area of the SDT for the logo data of the desired broadcast channel (service), the CDT of the service is detected. Is determined to have been transmitted, and by referring to the specified download_data_id, first, an arbitrary corresponding CDT section is obtained. In this way, by analyzing the logo data distribution descriptor described in the acquired CDT section, it is possible to know which logo_type of logo data is transmitted in which section (group) of which section number. Then, by setting so that the section number of the next necessary logo_type is filtered, the logo data can be efficiently acquired.

  Next, the configuration of the broadcast receiving device will be described. FIG. 5 is a block diagram showing a configuration of the broadcast receiving device. As shown in FIG. 5, the broadcast receiving apparatus includes a transmission path decoding unit 201, a module I / F unit 202, a section processing unit 203, a TS processing unit 204, a video decoding unit 205, an audio decoding unit 206, and an OSD processing unit 207. (OSD: On-Screen Display), communication I / F section 208, operation section 209, NVRAM 210 (Non-Volatile RAM), ROM 211 (ROM: Read Only Memory), RAM 212 (RAM: Random Access Memory), CPU 213 ( A central processing unit (CPU), a descrambler 214, and a storage unit 215 are provided, and each unit is connected by a bus 216.

  The transmission path decoding unit 201 performs demodulation processing and error correction decoding processing on a broadcast signal received from a reception antenna (not shown) to obtain a transport stream TS. The TS processing unit 204 performs a process of separating information multiplexed as packets as the transport stream TS and extracting a video signal, an audio signal, and the like. Also, the section processing unit 203 extracts PSI (Program Specific Information) and SI (Service Information) demultiplexed from the transport stream TS in cooperation with the TS processing unit 204, and further extracts section-related information such as CDT. Perform processing. For example, by setting a filtering condition, it is also possible to extract only a section having a specific section number from an EIT or CDT generally composed of a plurality of sections.

  Video decoding section 205 decodes the video signal output from TS processing section 204 and outputs the decoded video signal to OSD processing section 207. The audio decoding unit 206 decodes the audio signal output from the TS processing unit 204 and outputs the decoded audio signal to the audio output device 221. The audio output device 221 is an audio device including an amplifier, a speaker, and the like, and performs audio reproduction according to the audio signal output from the audio decoding unit 206. The OSD processing unit 207 performs predetermined OSD processing on the video signal output from the video decoding unit 205 under the control of the CPU 213, and outputs the video signal to the display device 222. The display device 222 is an LCD (Liquid Crystal Display) or the like, and performs screen display based on the output video signal. For example, the display device 222 displays a screen such as an EPG based on the SDT described in the broadcast channel information and the EIT described in the program information included in the SI separated from the multiplexed transport stream TS1.

  The communication I / F unit 208 is an interface that performs data communication with the communication network 4 using a predetermined communication protocol under the control of the CPU 213. The operation unit 209 is an operation key, a remote controller, or the like, and receives an operation input by a user. The NVRAM 210 stores various setting information. For example, in the NVRAM 210, a format of a content that can be handled by the broadcast receiving device 2 and the like are stored as setting information.

  The ROM 211 stores a program executed by the CPU 213 and the like. The RAM 212 provides a work area when the CPU 213 executes a program. The RAM 212 also provides an area for temporarily storing EIT information included in the SI separated from the multiplexed transport stream TS1. The CPU 213 centrally controls the operation of the broadcast receiving device 2 by expanding the program stored in the ROM 211 to a work area of the RAM 212 and sequentially executing the program.

  The module I / F unit 202 is an interface that connects to the security module 220 in which encryption key information for conditional access or the like is stored.

  The descrambler 214 descrambles the payload portion scrambled in the received transport stream TS1, based on the encryption key information stored in the security module 220. By the descrambling by the descrambler 214, the broadcast receiving apparatus 2 supports conditional access using EMM or ECM. The storage unit 215 is a large-capacity storage medium such as an HDD, and stores received content and the like, for example.

  Next, a processing operation relating to logo data of the broadcast receiving apparatus, which is executed under the control of the CPU 213, will be described with reference to the flowchart shown in FIG.

  First, when a broadcast signal is received (step S11), the broadcast signal is demodulated to obtain an SDT (step S12). Here, for the logo data of the desired broadcast channel (service), the presence or absence of a logo transmission descriptor is repeatedly determined from the acquired SDT (step S13), and if the logo transmission descriptor is described in the SDT (YES). Then, it is determined from the logo transmission descriptor whether there is a logo that has not been received yet (step S14). Based on the determination result of step S14, a CDT section of any section_number of the designated service is obtained (step S15), and a logo data distribution descriptor is extracted from the obtained CDT section and analyzed (step S16). Based on the analysis result, the CDT section of section_number for the desired logo_type of the designated service is obtained (step S17), the logo data is obtained from the obtained CDT section (step S18), and a series of processing ends.

  That is, according to the above processing procedure, it is possible to know which logo_type logo data is transmitted in which section (group) of which section number, so that the setting is performed so that the section number of the next necessary logo_type is filtered. By doing so, the logo data can be obtained efficiently.

  As described above, in the first embodiment, in the logo data transmission in the section format, the logo data distribution descriptor indicating the correspondence between the logo type and the section to be transmitted is designated and transmitted for the logo data to be transmitted. Therefore, the required number of types of logo data can be selected in a required number and transmitted efficiently in an arbitrary order without depending on the size of the logo data.

  In this embodiment, the CDT based on MPEG-2 TS used in current terrestrial broadcasting and the like has been described. However, it is assumed that TLV (Type Length Value) / MMT (MMT) assumed to be used in future advanced BS. It may be applied to MH-CDT based on MPEG Media Transport). However, in the case of TLV (Type Length Value) / MMT (MPEG Media Transport), there are the following differences in blocks and processing as compared with MPEG-2 TS. For MH-, the ARIB STD-B60 “Reference 1 Configuration of control information described in this standard” describes “Tables and descriptors specified in ARIB STD-B10. Modified table identifiers, descriptor tag values, etc. for use in broadcast systems that use MPEG-2, add `` MH- '' for MPEG-H at the beginning of the name to distinguish them from the original table and descriptor. I have. It is explained.

  The MH-CDT section of TLV / MMT is equivalent to the CDT section of MPEG-2 TS, the MH-SDT section of TLV / MMT is equivalent to the SDT section of MPEG-2 TS, and the MH-logo transmission descriptor of TLV / MMT Is equivalent to the MPEG-2 TS logo transmission descriptor.

  The data structure of the MH-CDT is described in ARIB STD-B60, Section 7.3.1.10. In this case, for example, even if the number of bits of the tag field (descriptor_tag) of the logo data distribution descriptor in FIG. 2 is set to 16 bits, the essence is not changed at all.

(Second embodiment)
Hereinafter, as a second embodiment, a broadcast transmitting apparatus in the case of the TLV / MMT will be described. FIG. 7 shows the configuration, in which logo data and logo management information for managing the logo of this logo data are input, and a logo data module unit 21, an MH-CDT section unit 22, and an MH-logo transmission, respectively. After passing through the descriptor generating unit 23 and the MH-SDT sectioning unit 24, the MMT multiplexing unit 25 multiplexes the multiplexed signal with a video signal, an audio signal, and the like. And then transmit it as a broadcast signal to the service area.

  More specifically, the transmitted logo data is sent to the logo data module 21 together with logo_id, logo_type, and logo_version, which are logo management information. The logo data module unit 21 stores the input logo data in an area called a logo data module for each logo_id and logo_type. The logo data module is sent to the MH-CDT sectioning unit 22 by the logo data modularizing unit 21. The MH-CDT sectioning section 22 distributes the logo data module into a plurality of sections of the MH-CDT and transmits the section to the MMT multiplexing section 25. Here, the MH-CDT is identified for each download_data_id. The logo data distribution information of the MH-CDT sectioning unit 22 is sent to the MH-logo transmission descriptor generation unit 23.

  The logo management information logo_id, logo_type, and logo_version are also sent to the MH-logo transmission descriptor generation unit 23. The MH-logo transmission descriptor generation unit 23 sets 0x01 when the CDT transmission method 1 is separately specified in the logo transmission type (logo_transmission_type), and sets the logo identification (logo_id) and the logo version number (logo_version). A logo transmission descriptor is generated by adding download data identification (download_data_id) together with the data management information. By setting download_data_id to the same value as download_data_id of MH-CDT, logo data of MH-CDT transmission corresponding to a certain broadcast channel (service) can be specified. Here, the MH-logo transmission descriptor generation unit 23 receives the logo data distribution information from the MH-CDT sectioning unit 22, and extends the contents of the logo data distribution information in the MH-logo transmission descriptor.

  The MH-SDT sectioning unit 24 arranges the MH-logo transmission descriptor in the MH-SDT descriptor area for each service_id specifying the broadcast channel, transmits the descriptor to the MMT multiplexing unit 25, and transmits the MH-CDT section data. Multiplex with

  The essential difference from the configuration of the first embodiment shown in FIG. 1 is that instead of newly defining the logo data distribution information as a descriptor and describing it in the descriptor area in the MH-CDT, the MH-SDT is described. The extended MH-logo transmission descriptor is described. FIG. 8 shows this expansion.

  According to this configuration, since the logo data distribution information can be acquired before the acquisition of the MH-CDT by describing in the MH-SDT, the receiver first acquires one of the sections of the MH-CDT and acquires the logo. In FIG. 8, the step of checking the data distribution descriptor is unnecessary, and the logo data of the required logo_type can be obtained more efficiently.

  Note that the processing of the present embodiment is also applicable to the MPEG-2 TS system of the first embodiment.

(Third embodiment)
The third embodiment can be realized by the same sending device as the second embodiment. However, the logo data distribution information is not inserted into the MH-logo transmission descriptor. The logo data distribution information is fixedly determined in advance according to the operation rules, or is additionally inserted into data_module_byte of MH-CDT.

  In advanced broadband satellite digital broadcasting, logo_type for three types of size patterns is defined. One is "2K", which is the same as "HD Large" defined in digital terrestrial broadcasting. The other two are "small" assuming display on a 4K screen and "large" assuming display on an 8K screen. The number of vertical and horizontal dots is twice that of "2K". , Quadrupling. Further, in the “small” and “large” logos, although the number of colors used at the same time is limited, a color palette is also transmitted to enable the use of 8-bit full color RGB. For this reason, the upper limit of the logo data size is large.

  The “2K” logo has a maximum size of 1152 bytes, which is the same as the “HD Large” terrestrial digital broadcast, and can be sent with one MH-CDT, but “Small” requires 8000 bytes and “Large” requires 16000 bytes. It is assumed to be the upper limit and cannot be sent by one MH-CDT. For this reason, a new regulation for transmitting logo data by a plurality of MH-CDTs is required. Hereinafter, as a third embodiment, a method for transmitting logo data by a plurality of MH-CDTs will be described.

  FIG. 9 shows a flow of processing according to the third embodiment. In FIG. 9, the input of the logo data is waited for (step S21). If the input of the logo data is performed, it is determined whether the logo_type indicates 2K, large or small, and the logo data is determined for each logo_type. The value of the section_number to be distributed is set (step S22). Subsequently, in consideration of the maximum capacity of the MH-CDT, the logo data is divided and set in the data_module_byte of the MH-CDT section together with the arrangement information (step S23), and a series of processing ends.

  That is, in the present embodiment, a service logo of a large size that does not fit in one section is transmitted by MH-CDT due to a change in only the operation rule such as a change in the definition of data_module_byte. Therefore, it is added to the ARIB standard to create a new data structure other than the MH-CDT, describe a new descriptor to be inserted into the MH-CDT, or change the definition of the MH-logo transmission descriptor. No changes need to be made.

  Examples 1 to 5 will be described below for specific processing of this embodiment.

[Example 1]
In the logo data module unit 11 shown in FIG. 1, the data_module_byte syntax of the terrestrial digital broadcasting is expressed as “the number of bytes of the logo of the corresponding logo_type, that is, the total size of the data divided into each section and entered. Add a field called "total_logo_size". An example is shown in FIG. In addition, instead of the provision in digital terrestrial broadcasting that "logo of each size is transmitted in the section of section_number that matches the logo_type value", the section_number value used for each logo_type is fixed and used. Provision is made in the regulations. Here, temporarily
2K 0
Large 1-4
Small 5-6
And Also, the logo data is divided every 4000 bytes and stored in data_byte. By deciding in this way, the range of section_number of the section obtained to receive the logo_type logo can be known in advance without using information in the received MH-CDT. For example, if you want only a small logo, instead of acquiring all sections with section_number 0 to 6 and judging the logo_type in data_module_byte, instead of judging that sections with section_number 5 and 6 are applicable, section_number You only need to get sections 5 and 6.

  In addition, by determining the division size by adding total_logo_size, it is possible to determine that it is not necessary to receive all sections of section_number determined by logo_type. For example, if the total_logo_size is 10000 bytes in a large logo, the data_size of the sections with section_numbers of 1 to 4 will be 4000 bytes, 4000 bytes, 2000 bytes, and 0 bytes, respectively, in that order. I understand. Similarly, if the section of section_number = 5 is obtained and the total_logo_size is 4000 bytes or less, it is understood that the section of section_number = 6 is not required to be obtained.

  Here, as an example, the section_number values are assigned in the order of the logotype values, but the order may not be this order.

  Here, the division size is 4000 bytes as an example, but another value may be used. For example, assuming that the division size is 4070 bytes, a logo whose total_logo_size is 10000 bytes may be divided into 4070 bytes, 4070 bytes, 1860 bytes, and 0 bytes.

  Also, here, as an example, total_logo_size is added to data_module_byte to determine the division size, but information about whether there is a continuation of data_module_byte may be added without determining the division size, and the division size may be determined. Further, other information such as whether or not there is a continuation may be further added.

[Example 2]
It is not clear in what order the sections are sent in the stream, and while re-setting the section filter to get the next section after getting one section, May be missed, and if one section is acquired and then the next section is acquired, the time until all desired sections are acquired may be long. Also, by setting the section filter at the same time, the acquisition time can be shortened, but the resources of the section filter are consumed much.

  As means for avoiding this, it is conceivable to specify a mask in the condition of the section filter.

  This is a function to acquire a section regardless of whether some bits are 0 or 1. In the section_number mask specification, the bit specified as 0 is 0, the bit specified as 1 is 1, and the bit that may be 0 or 1 is represented by x.

Large logos can have up to 4 sections, small logos can have up to 2 sections, and it is more efficient to mask with 2 bits for large logos and 1 bit for small logos. Therefore, the mask specification of the section_number of the large logo is 000001xx (00000100, 00000101, 00000110, 00000111), and the mask specification of the section_number of the small logo is 0000001x (00000010, 00000011). In this case, the section_number value to use is
Small 2-3
Large 4-7
Becomes in addition
2K 0
In this case, the section with section_number = 1 becomes unnecessary.

  Normally, section_number is arranged without omission from 0 to last_section_number, but in EIT [schedule] (and MH-EIT [schedule]), an operation in which a section in the middle may be omitted as an exception. Therefore, if the MH-CDT is stipulated to perform the exceptional operation of not sending the section with section_number = 1, the logo data of each logo_type can be transmitted in seven sections with section_number 0 and 2 to 7. .

  Here, although section_number = 1 is unnecessary as an example, logo data of each logo_type may be transmitted in seven sections with section_numbers 1 to 7, with section_number = 0 as an unnecessary section.

[Example 3]
In the case of specifying the same mask as in the second embodiment, if it is possible to indicate that the data is invalid, this can be realized without performing exceptional operation such as not sending a section in the middle.

  For example, this can be realized by deciding not to use the value of 0xFF as logo_type in the future and determining that the data is invalid if the value of logo_type of data_module_byte is 0xFF. In the case of a receiver that acquires only the section of the necessary section_number, this section is not acquired, so there is no effect on the processing. In the case of a receiver that acquires all section_number sections using the section filter mask function, it is only necessary to determine that the data is invalid data and discard it.

[Example 4]
Alternatively, when a mask is specified in the same manner as in the second embodiment, one section may not be used for transmitting the logo data itself but may be used for transmitting other information.

  The 2K logo is transmitted with section_number = 1, section_number = 0 is used to transmit other information, section_number = 0 is used for special data, and section_number 1 to 7 can be used for transmitting logo data. it can.

  For example, by setting data_module_byte in the case of section_number = 0 as shown in FIG. 11, it is possible to indicate which logo_type of logo data is transmitted by each section number, that is, logo data distribution information. In the example of FIG. 11, the loop is turned by number_of_logo_type, which is the number of logo_types, so that the number of bytes of logo data for each section_number (start_section_number + j) used in each logo_type can be specified.

[Example 5]
If data_module_byte as shown in FIG. 11 is transmitted with section_number = 0, even if the range of section_number used for each logo_type is not fixed in the operation regulations, section_number of the desired logo_type after acquiring section_number = 0 By taking the two steps of acquiring the section, the service logo of the desired logo_type can be acquired. Although the time required to obtain a desired logo may be lengthened by performing the two steps, it is possible to cope with a case where a new logo_type is added in the future.

  When the range of section_number is not fixed by the operation rule, the number of sections used in logo_type may be fixed to the maximum, or may be variable depending on the size of the logo data.

  As described above, in the third embodiment, by changing the definition of data_module_byte and the rule for allocating section_number, a new data structure other than MH-CDT or a new descriptor to be inserted into MH-CDT is stored in ARIB. Large-sized service logos that do not fit in one section can be transmitted by MH-CDT without additional definition in the standard or changing the definition of the MH-logo transmission descriptor in the ARIB standard. .

  Further, in the first to fourth embodiments, it is possible to acquire only the section of section_number of the desired logo_type, as in the case of digital terrestrial broadcasting. In the second to fourth embodiments, by setting a section filter by masking the section_number, it is possible to efficiently obtain a large logo and a small logo. Further, in the fifth embodiment, it is possible to cope with a case where a logo_type is newly added in the future.

  In the embodiment, CDT and MH-CDT are collectively referred to as common data table information, SDT and MH-SDT are collectively referred to as service description table information, and a logo transmission descriptor and an MH-logo transmission descriptor are referred to as a logo transmission descriptor. Shall be collectively referred to as

  Although several embodiments of the present invention have been described, these embodiments are provided by way of example and are not intended to limit the scope of the invention. These new embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and their equivalents.

  11: Logo data module, 12: CDT section, 13: Logo data distribution descriptor generator, 14: Logo transmission descriptor generator, 15: SDT section generator, 16: Multiplexer, 21: Logo Data module forming unit, 22: MH-CDT sectioning unit, 23: MH-logo transmission descriptor generating unit, 24: MH-SDT sectioning unit, 25: MMT multiplexing unit, 2201: transmission line decoding unit, 202 ... Module I / F section, 203 section processing section, 204 TS processing section, 205 video decoding section, 206 audio decoding section, 207 OSD processing section, 208 communication I / F section, 209 operation section, 210 ... NVRAM, 211 ROM, 212 RAM, 213 CPU, 214 descrambler, 215 storage unit, 216 bus.

Claims (3)

A digital television broadcasting system capable of multiplexing and transmitting an arbitrary number of different types of logo data for one logo identification with a size exceeding one section of an MH-CDT (MH-Common Data Table),
A plurality of sections of the MH-CDT section number set in advance for each of the MH-CDTs in the MH-CDT by dividing the logo data into a module for each of the logo identification and the logo types and dividing the modularized logo data into the MH-CDTs. In the data module area of the MH-CDT section, and sets the arrangement information indicating the correspondence between the type of the logo data and the MH-CDT section number, and multiplexes the MH-CDT with a broadcast signal and transmits the multiplexed broadcast signal. Transmission system,
Receiving the broadcast signal, acquiring the MH-CDT from the received broadcast signal, acquiring the arrangement information from the data module area of the acquired MH-CDT, and acquiring the arrangement information from the MH-CDT based on the arrangement information. A digital television broadcasting system comprising: a receiving system that acquires any type of logo data from a plurality of MH-CDT sections. A transmission device used in a digital television broadcasting system capable of multiplex transmission of an arbitrary number of different types of logo data for one logo identification with a size exceeding one section of an MH-CDT (MH-Common Data Table). ,
A modularization unit for modularizing the logo data for each of the logo identification and logo types;
The logo data modularized by the modularization unit is divided and arranged in a plurality of sections of the MH-CDT section number set in advance for each type of the logo of the MH-CDT, and the type of the logo data and the An MH-CDT sectioning unit that sets arrangement information indicating a correspondence relationship with the MH-CDT section number in a data module area of the MH-CDT section,
A multiplexing unit that multiplexes the MH-CDT generated by the MH-CDT sectioning unit into a broadcast signal,
A digital television broadcast transmitting device for transmitting a broadcast signal obtained by the multiplexing unit. A receiving device used for a digital television broadcasting system capable of multiplexing transmission of an arbitrary number of different types of logo data for one logo identification with a size exceeding one section of an MH-CDT (MH-Common Data Table). ,
A plurality of sections of the MH-CDT section number set in advance for each of the MH-CDTs in the MH-CDT by dividing the logo data into a module for each of the logo identification and the logo types and dividing the modularized logo data into the MH-CDTs. In the data module area of the MH-CDT section, and sets the arrangement information indicating the correspondence between the type of the logo data and the MH-CDT section number, and multiplexes the MH-CDT with a broadcast signal and transmits the multiplexed broadcast signal. Corresponding to the transmitting device,
A receiving unit that receives the broadcast signal,
The MH-CDT is obtained from the broadcast signal received by the receiving unit, the arrangement information is acquired from a data module area of the acquired MH-CDT, and a plurality of MHs of the MH-CDT are acquired based on the arrangement information. -A receiving device for digital television broadcasting, comprising a logo data acquisition unit for acquiring any type of logo data from the CDT section.

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