Transmitter and program

Abstract

To transmit emergency information without changing size of TMCC information.SOLUTION: A transmitter 10 according to the present disclosure includes a TMCC information generation part 11 for generating TMCC information, a header generation part for generating a header 12 including the TMCC information, a transmission signal generation part 13 for generating a transmission signal including the header and sub frame data, the TMCC information includes transmission control auxiliary information, and the TMCC information generation part 11 includes emergency information into the TMCC information and decreases the size of the transmission control auxiliary information by the size of the emergency information when the emergency information is to be transmitted.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a transmitting device and a program. [Background technology]

[0002] In the advanced terrestrial digital television broadcasting system, in order to ensure future expandability, it is permitted to make the TMCC section that transmits TMCC (Transmission and Multiplexing Configuration and Control) information that controls broadcast transmission variable in length (see Non-Patent Document 1). In order to transmit an Earthquake Early Warning (EEW), the TMCC information is equipped with a function that increases the number of bits when an EEW is issued and transmits the EEW information. By implementing this function, the Earthquake Early Warning can be transmitted to the receiving device without delay. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Ministry of Internal Affairs and Communications, Information and Communications Council, Information and Communications Council, Information and Communications Technology Subcommittee (173rd) Handouts, Proceedings, and Minutes, Material 173-1-2, Broadcasting System Committee Report, [Retrieved August 24, 2023], Internet<URL:https: / / www.soumu.go.jp / main_content / 000892617.pdf> Summary of the Invention [Problem to be solved by the invention]

[0004] If the number of bits of TMCC information is increased when EEW information is included in the TMCC information, the number of symbols constituting the TMCC section changes, and the OFDM (Orthogonal Frequency Division Multiplexing) frame length also changes. In a receiving device for which the OFDM frame length is assumed to be fixed, the change in the OFDM frame length causes the receiving operation to be redone, which causes problems in obtaining emergency information. In addition, in the case of a partial reception configuration, if the number of bits of TMCC information is variable, the TMCC section length in the non-partial reception band becomes variable, making it difficult to perform convolution interleaving processing together with the subframe sections for video, audio, etc. As a result, it is necessary to limit the range of time interleaving in hierarchical transmission.

[0005] Therefore, there is a demand for technology that can transmit emergency information such as EEW information without changing the size (number of bits) of the TMCC information.

[0006] An object of the present invention is to provide a transmitting device and a program that solve the above-mentioned problems and are capable of transmitting emergency information without changing the size (number of bits) of TMCC information. [Means for solving the problem]

[0007] (1) A transmitting device according to the present disclosure is a transmitting device that transmits emergency information, and includes a TMCC information generating unit that generates TMCC information used for control in broadcast transmission, a header generating unit that generates a header including the TMCC information, and a transmission signal generating unit that generates a transmission signal including the header and subframe data, wherein the TMCC information includes transmission control auxiliary information, and when transmitting the emergency information, the TMCC information generating unit includes the emergency information in the TMCC information and reduces the size of the transmission control auxiliary information by the size of the emergency information.

[0008] (2) In the transmitting device described in (1), the transmission control auxiliary information includes number_of_aux_data of a predetermined number of bits indicating the number of the transmission control auxiliary information, aux_data_type of a predetermined number of bits indicating a transmission control auxiliary information identification for identifying the transmission control auxiliary information, and aux_data_size of a predetermined number of bits indicating the size of the transmission control auxiliary information, and the value of aux_data_size is set so that the sum of the number of bits of the aux_data_type, the number of bits of the aux_data_size, and the number of bits of the transmission control auxiliary information indicated in the aux_data_size matches the number of bits of the emergency information, and when the emergency information is not to be transmitted, the TMCC information generation unit transmits non-emergency information of the number of bits set in the aux_data_size as the transmission control auxiliary information, and when the emergency information is to be transmitted, includes the emergency information in the TMCC information, decreases the value of the number_of_aux_data by 1, and does not include the aux_data_type and the aux_data_size corresponding to the non-emergency information in the TMCC information.

[0009] (3) In the transmitting device described in (1), the transmission control auxiliary information includes number_of_aux_data of a predetermined number of bits indicating the number of the transmission control auxiliary information, aux_data_type of a predetermined number of bits indicating a transmission control auxiliary information identification for identifying the transmission control auxiliary information, and aux_data_size of a predetermined number of bits indicating the size of the transmission control auxiliary information, and the value of the aux_data_size is set so that the sum of the number of bits of the number_of_aux_data, the number of bits of the aux_data_type, the number of bits of the aux_data_size, and the number of bits of the transmission control auxiliary information indicated in the aux_data_size matches the number of bits of the emergency information, and when the emergency information is not to be transmitted, the TMCC information generating unit transmits non-emergency information of the number of bits set in the aux_data_size as the transmission control auxiliary information, and when the emergency information is to be transmitted, includes the emergency information in the TMCC information, decreases the value of the number_of_aux_data by 1, and does not include the aux_data_type and the aux_data_size corresponding to the non-emergency information in the transmission control auxiliary information.

[0010] (4) In the transmitting device described in (1), the transmission control auxiliary information includes an aux_data_size of a predetermined number of bits indicating the size of the transmission control auxiliary information, the value of the aux_data_size is set so that the number of bits of the transmission control auxiliary information indicated in the aux_data_size matches the number of bits of the emergency information, and the TMCC information generating unit transmits non-emergency information of the number of bits set in the aux_data_size as the transmission control auxiliary information when the emergency information is not to be transmitted, and when the emergency information is to be transmitted, includes the emergency information in the TMCC information and sets the value of the aux_data_size corresponding to the non-emergency information to 0.

[0011] (5) In the transmitting device described in any one of (2) to (4), the non-emergency information is non-real-time information.

[0012] (6) A program according to the present disclosure causes a computer to operate as a transmission device according to any one of (1) to (5). Effect of the Invention

[0013] According to the transmitting device and the program of the present invention, it is possible to transmit emergency information such as EEW information without changing the size of the TMCC information. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a diagram illustrating a configuration example of a transmission device according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a diagram illustrating an example of the configuration of TMCC information. [Diagram 3] 3 is a diagram showing an example of the structure of Auxiliary_data (auxiliary transmission control information) shown in FIG. 2; [Figure 4] 4 is a diagram illustrating an example of the configuration of aux_data_type (auxiliary control information identification) illustrated in FIG. 3. [Diagram 5] FIG. 1 is a diagram for explaining transmission of EEW information according to a conventional method. [Figure 6] 1. FIG. 4 is a diagram for explaining transmission of EEW information by the TMCC information generating unit shown in FIG. 1 in a first method. [Figure 7] 1. FIG. 4 is a diagram for explaining the transmission of EEW information by the TMCC information generating unit shown in FIG. 1 in a second method. [Figure 8] 1. FIG. 4 is a diagram for explaining the transmission of EEW information by the TMCC information generating unit shown in FIG. 1 in a third method. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0016] FIG. 1 is a diagram showing a configuration example of a transmission device 10 according to an embodiment of the present disclosure. The transmission device 10 according to the present embodiment transmits emergency information such as EEW information. In the following, the emergency information is assumed to be EEW information. In the advanced terrestrial digital television broadcasting system, as in the current ISDB-T, it is assumed that hierarchical transmission is performed in which data signals of multiple layers having different transmission resistance and transmission capacity are simultaneously transmitted in the same channel. The transmission device 10 according to the present disclosure corresponds to, for example, a remultiplexing device that outputs a transmission signal in which data signals of each layer of hierarchical transmission and a TMCC signal are multiplexed to a modulation device. Note that FIG. 1 mainly shows a configuration related to the transmission of EEW information, and other configurations are omitted.

[0017] As shown in FIG. 1, a transmitting device 10 according to this embodiment includes a TMCC information generating unit 11, a header generating unit 12, and a transmission signal generating unit 13.

[0018] The TMCC information generating unit 11 receives transmission control information indicating the carrier modulation method, the coding rate of the error correction code, the frame structure, etc. The TMCC information generating unit 11 also receives a flag indicating whether or not to transmit EEW information. For example, if EEW information is not to be transmitted, the flag is 0 (Flag=0), and if EEW information is to be transmitted, the flag is 1 (Flag=1). The TMCC information generating unit 11 generates TMCC information used for control in broadcast transmission based on the input transmission control information.

[0019] FIG. 2 is a diagram showing the configuration of TMCC information defined in Non-Patent Document 1.

[0020] As shown in Fig. 2, the TMCC information includes an emergency earthquake information flag (earthquake_early_warning_flag) indicating whether or not there is an emergency earthquake warning, and emergency earthquake warning data (Earthquake_early_warning_data). If the input flag is "0", the TMCC information generation unit 11 sets earthquake_early_warning_flag=0. If the input flag is "1", the TMCC information generation unit 11 sets earthquake_early_warning_flag=1. The TMCC information generation unit 11 stores the emergency earthquake warning data corresponding to the EEW information in Earthquake_early_warning_data.

[0021] As shown in Fig. 2, the TMCC information includes auxiliary transmission control information (Auxiliary_data). The auxiliary transmission control information is auxiliary information for controlling broadcast transmission. Fig. 3 is a diagram showing the configuration of the auxiliary transmission control information (Auxiliary_data) defined in Non-Patent Document 1.

[0022] As shown in Fig. 3, the transmission control auxiliary information includes a transmission control auxiliary information number (number_of_aux_data) of a predetermined number of bits (8 bits in the example shown in Fig. 3) indicating the number of pieces of transmission control auxiliary information. In addition, the transmission control auxiliary information includes, for each piece of transmission control auxiliary information, a transmission control auxiliary information identification (aux_data_type) of a predetermined number of bits (8 bits in the example shown in Fig. 3) for identifying the type of the transmission control auxiliary information, and a transmission control auxiliary information size (aux_data_size) of a predetermined number of bits (8 bits in the example shown in Fig. 3) indicating the size (number of bits) of the transmission control auxiliary information. Fig. 4 is a diagram showing the configuration of the transmission control auxiliary information identification (aux_data_type) defined in Non-Patent Document 1.

[0023] As shown in FIG. 4, the auxiliary transmission control information identification (aux_data_type) includes a reserved area.

[0024] When transmitting emergency information (EEW ​​information), the TMCC information generating unit 11 includes the emergency information in the TMCC information (Earthquake_early_warning_data) and reduces the size of the transmission control auxiliary information by the size (number of bits) of the emergency information. In this way, it is possible to transmit the emergency information without changing the size (number of bits) of the TMCC information. The operation of the TMCC information generating unit 11 will be described in detail later.

[0025] Referring back to FIG. 1, the TMCC information generating unit 11 outputs the generated TMCC information to the header generating unit 12.

[0026] The header generating unit 12 receives frame synchronization signal information and the TMCC information output from the TMCC information generating unit 11. The frame synchronization signal is placed at the beginning of a frame and is a signal for synchronous reproduction in a receiving device. The frame synchronization signal also includes information such as the transmission method of the TMCC section in which a TMCC signal is transmitted, which follows the frame synchronization signal section in which the frame synchronization signal is transmitted. The frame synchronization signal information is information included in the frame synchronization signal that indicates the transmission method of the TMCC section. The header generating unit 12 generates a header of a transmission signal including the TMCC information based on the frame synchronization signal information and outputs the header to the transmission signal generating unit 13.

[0027] Subframe data such as video and audio, and the header output from header generation unit 12 are input to transmission signal generation unit 13. Transmission signal generation unit 13 generates a transmission signal including the input header and subframe data, and outputs the signal to a modulation device (not shown in FIG. 1).

[0028] Next, the operation of the TMCC information generating unit 11 according to the present embodiment will be described.

[0029] First, for comparison, this figure is a diagram for explaining transmission of EEW information by a conventional method in which EEW information is simply added to TMCC information when transmitting EEW information.

[0030] As shown in FIG. 5, when EEW information is transmitted, the emergency earthquake information flag (EEW ​​flag) changes from "0" to "1." In the conventional method, the EEW information is stored in the emergency earthquake warning data (Earthquake_early_warning_data). Note that Non-Patent Document 1 specifies that the EEW information is 105-bit information. By storing the EEW information in the emergency earthquake warning data (Earthquake_early_warning_data), as shown in FIG. 5, the number of bits of the TMCC information increases by the number of bits of the EEW information (105 bits).

[0031] On the other hand, in this embodiment, as described above, when transmitting emergency information, the TMCC information generating unit 11 includes the emergency information in the TMCC information and reduces the size of the transmission control auxiliary information by the size of the emergency information. The following three methods (first to third methods) can be considered as a method for reducing the size of the transmission control auxiliary information. Each method will be described below.

[0032] As described with reference to FIG. 2, the transmission control auxiliary information includes number_of_aux_data (8 bits) indicating the number of transmission control auxiliary information, aux_data_type (8 bits) indicating the transmission control auxiliary information identification, and aux_data_size (8 bits) indicating the size of the transmission control auxiliary information. When EEW information is not transmitted (EEW ​​flag=0), the TMCC information generating unit 11 transmits non-emergency information as the transmission control auxiliary information. Non-emergency information is not information that requires real-time performance like EEW information, but is non-real-time information. When transmitting non-emergency information, the TMCC information generating unit 11 sets a value corresponding to the non-emergency information in the reserved area of ​​aux_data_type described with reference to FIG. 4.

[0033] 6 is a diagram for explaining the transmission of EEW information by the TMCC information generating unit 11 in the first method. In the first method, the value of aux_data_size is set so that the sum of the number of bits of aux_data_type (8 bits), the number of bits of aux_data_size (8 bits), and the number of bits of the transmission control auxiliary information indicated in aux_data_size matches the number of bits of the EEW information (105 bits). Since the AUX information (aux_data_type and aux_data_size) is 16 bits, in the first method, 89 (=105-16) bits are set as the value of aux_data_size. When the TMCC information generating unit 11 does not transmit EEW information, it transmits 89 bits of non-emergency information as the transmission control auxiliary information.

[0034] Furthermore, in the first technique, when transmitting EEW information, the TMCC information generating unit 11 includes the EEW information in the TMCC information and does not transmit non-emergency information, as shown in Fig. 6. Specifically, since the TMCC information generating unit 11 does not transmit non-emergency information, it decrements the value of number_of_aux_data by 1. Furthermore, the TMCC information generating unit 11 does not include AUX information (aux_data_type and aux_data_size) corresponding to the non-emergency information in the TMCC information.

[0035] When the transmission of the emergency information is completed, the TMCC information generating unit 11 increments the value of number_of_aux_data by 1 (returns the value of number_of_aux_data to the original value) and transmits non-emergency information. As described above, non-emergency information is non-real-time information. Therefore, even if non-emergency information is not transmitted when emergency information is transmitted, the receiving operation of the receiving device is not affected.

[0036] FIG. 7 is a diagram for explaining the transmission of EEW information by the TMCC information generating unit 11 in the second method. In the second method, the value of aux_data_size is set so that the sum of the number of bits of number_of_aux_data (8 bits), the number of bits of aux_data_type (8 bits), the number of bits of aux_data_size (8 bits), and the number of bits of the transmission control auxiliary information indicated in aux_data_size matches the number of bits of the EEW information (105 bits). Since the number of bits of AUX (number_of_aux_data) is 8 bits and the AUX information (aux_data_type and aux_data_size) is 16 bits, in the second method, 81 (=105-8-16) bits are set as the value of aux_data_size. When the TMCC information generating unit 11 does not transmit EEW information, it transmits 81 bits of non-emergency information as the transmission control auxiliary information.

[0037] In the second technique, when transmitting EEW information, the TMCC information generating unit 11 includes the EEW information in the TMCC information and does not transmit non-emergency information, as shown in Fig. 7. Specifically, since the TMCC information generating unit 11 does not transmit non-emergency information, it decrements the value of number_of_aux_data by 1. Furthermore, the TMCC information generating unit 11 does not include AUX information (aux_data_type and aux_data_size) corresponding to the non-emergency information in the TMCC information.

[0038] When the transmission of the emergency information is completed, the TMCC information generating unit 11 increments the value of number_of_aux_data by 1 (returns the value of number_of_aux_data to its original value), and transmits non-emergency information.

[0039] When only non-emergency information is transmitted as the auxiliary transmission control information, if non-emergency information is not transmitted in order to transmit emergency information, the value of number_of_aux_data becomes "0." When the value of number_of_aux_data becomes "0," the number of bits of non-emergency information can be reduced according to the second method in an operation in which Auxiliary_data (auxiliary transmission control information) itself is not used.

[0040] 8 is a diagram for explaining the transmission of EEW information by the TMCC information generating unit 11 in the third method. In the third method, the value of aux_data_size is set so that the number of bits of the transmission control auxiliary information indicated in aux_data_size matches the number of bits of the EEW information (105 bits). That is, in the third method, 105 bits are set as the value of aux_data_size. When not transmitting EEW information, the TMCC information generating unit 11 transmits AUX information corresponding to non-emergency information and transmits 105 bits of non-emergency information as the transmission control auxiliary information.

[0041] In addition, in the third technique, when transmitting EEW information, the TMCC information generating unit 11 includes the EEW information in the TMCC information and does not transmit non-emergency information, as shown in Fig. 8. Specifically, since the TMCC information generating unit 11 does not transmit non-emergency information, it sets the value of aux_data_size to 0 bits.

[0042] As described above, the transmitting device 10 according to this embodiment includes a TMCC information generating unit 11 that generates TMCC information, a header generating unit 12 that generates a header including the TMCC information, and a transmission signal generating unit 13 that generates a transmission signal including the header and subframe data. The TMCC information includes auxiliary transmission control information (Auxiliary_data). When transmitting emergency information, the TMCC information generating unit 11 includes the emergency information in the TMCC information and reduces the size of the auxiliary transmission control information by the size of the emergency information.

[0043] When emergency information is included in TMCC information and transmitted, the size of the transmission control auxiliary information included in the TMCC information is reduced by the size of the emergency information, making it possible to transmit the emergency information without changing the size (number of bits) of the TMCC information. Also, since the size of the TMCC information does not change even when emergency information is transmitted, the TMCC section length can be fixed. This makes it possible to time interleave subframes including TMCC sections.

[0044] Although not specifically mentioned in the embodiment, a program for causing a computer to operate as the transmitting device 10 may be provided. The program may also be recorded in a computer-readable medium. The computer-readable medium can be used to install the program in a computer. Here, the computer-readable medium on which the program is recorded may be a non-transient recording medium. The non-transient recording medium is not particularly limited, and may be, for example, a recording medium such as a CD-ROM or a DVD-ROM.

[0045] Alternatively, a chip may be provided that is configured with a memory that stores programs for executing the various processes performed by transmission device 10 and a processor that executes the programs stored in the memory and is mounted on transmission device 10.

[0046] Although the above-mentioned embodiment has been described as a representative example, it is clear to those skilled in the art that many modifications and substitutions are possible within the spirit and scope of the present invention. Therefore, the present invention should not be interpreted as being limited by the above-mentioned embodiment, and various modifications and changes are possible without departing from the scope of the claims. For example, it is possible to combine multiple building blocks shown in the configuration diagram of the embodiment into one, or to divide one building block. [Explanation of symbols]

[0047] 10 Transmitting device 11 TMCC information generation section 12 Header Generation Unit 13 Transmission signal generator

Claims

1. A transmitting device for transmitting emergency information, a TMCC information generating unit that generates TMCC information used for control in broadcast transmission; a header generating unit that generates a header including the TMCC information; a transmission signal generating unit that generates a transmission signal including the header and subframe data; The TMCC information includes transmission control auxiliary information, The TMCC information generating unit A transmitting device that, when transmitting the emergency information, includes the emergency information in the TMCC information and reduces a size of the transmission control auxiliary information by a size of the emergency information.

2. 2. The transmitting device according to claim 1, The transmission control auxiliary information includes a number_of_aux_data having a predetermined number of bits indicating the number of the transmission control auxiliary information, an aux_data_type having a predetermined number of bits indicating a transmission control auxiliary information identification for identifying the transmission control auxiliary information, and an aux_data_size having a predetermined number of bits indicating a size of the transmission control auxiliary information, the value of the aux_data_size is set so that the sum of the number of bits of the aux_data_type, the number of bits of the aux_data_size, and the number of bits of the transmission control auxiliary information indicated by the aux_data_size is equal to the number of bits of the emergency information; The TMCC information generating unit When the emergency information is not to be transmitted, non-emergency information of a number of bits set in the aux_data_size is transmitted as the transmission control auxiliary information; A transmitting device, when transmitting the emergency information, includes the emergency information in the TMCC information, decrements the value of the number_of_aux_data by 1, and does not include the aux_data_type and the aux_data_size corresponding to the non-emergency information in the TMCC information.

3. 2. The transmitting device according to claim 1, The transmission control auxiliary information includes a number_of_aux_data having a predetermined number of bits indicating the number of the transmission control auxiliary information, an aux_data_type having a predetermined number of bits indicating a transmission control auxiliary information identification for identifying the transmission control auxiliary information, and an aux_data_size having a predetermined number of bits indicating a size of the transmission control auxiliary information, the value of the aux_data_size is set so that the sum of the number of bits of the number_of_aux_data, the number of bits of the aux_data_type, the number of bits of the aux_data_size, and the number of bits of the transmission control auxiliary information indicated by the aux_data_size is equal to the number of bits of the emergency information; The TMCC information generating unit When the emergency information is not to be transmitted, non-emergency information of a number of bits set in the aux_data_size is transmitted as the transmission control auxiliary information; A transmitting device, when transmitting the emergency information, includes the emergency information in the TMCC information, decrements the value of the number_of_aux_data by 1, and does not include the aux_data_type and the aux_data_size corresponding to the non-emergency information in the transmission control auxiliary information.

4. 2. The transmitting device according to claim 1, The transmission control auxiliary information includes an aux_data_size having a predetermined number of bits indicating a size of the transmission control auxiliary information, The value of the aux_data_size is set so that the number of bits of the auxiliary control information indicated by the aux_data_size coincides with the number of bits of the emergency information; The TMCC information generating unit When the emergency information is not to be transmitted, non-emergency information of a number of bits set in the aux_data_size is transmitted as the transmission control auxiliary information; A transmitting device, when transmitting the emergency information, including the emergency information in the TMCC information and setting a value of the aux_data_size corresponding to the non-emergency information to 0.

5. 5. The transmitting device according to claim 2, A transmitting device, wherein the non-urgent information is non-real-time information.

6. A program for causing a computer to operate as the transmitting device according to claim 1.

Images