JP5165305B2 - Mobile broadcast receiving terminal - Google Patents

Description

  The present invention relates to a mobile broadcast receiving terminal that receives a digital broadcast.

  Patent Document 1 discloses an emergency broadcast system that receives and reproduces a broadcast from a broadcast station that broadcasts emergency information in a program when an emergency alert is received. In Patent Document 1, analog broadcasting is assumed as a broadcasting method. In analog broadcasting, emergency information is notified as video or audio in a broadcast program. Therefore, when an emergency alert is detected, the receiver automatically selects a program for notifying a preset emergency broadcast and displays the program to notify the user of emergency information.

JP 2005-192064 A

  By the way, digital broadcasting that has recently started includes data broadcasting that distributes data, programs, and the like in addition to video and audio. In data broadcasting, useful information is expected to be delivered as soon as possible in an emergency. Therefore, it is preferable to display a data broadcast when an emergency alert is issued.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to notify a user of emergency information more quickly when an emergency alarm is detected.

  In order to solve the above problem, the mobile broadcast receiving terminal of the present invention displays a data broadcast on the screen of the terminal when a signal indicating an emergency alert is transmitted.

For example, the present invention is a mobile broadcast receiving terminal that receives a digital broadcast,
TS processing means for restoring a TS (Transport Stream) packet from a signal including digital broadcasting;
A video / audio decoder for restoring a signal indicating video or audio from a TS packet including a signal indicating video or audio;
A data broadcast decoder that restores the content from the TS packet including the content included in the data broadcast;
Display means for displaying the video restored by the video / audio decoder and the content restored by the data broadcast decoder on a display device;
Emergency warning detection means for detecting a signal indicating an emergency warning from a digital broadcast signal,
The TS packet including the content of the data broadcast has section data for each group of data included in the content,
The data broadcast decoder, when an emergency alert is detected by the emergency alert detection means, every time one section data is restored by the TS processing means, by first decoding from the restored section data, Restore part of the content corresponding to the section data,
The display means includes
When an emergency alert is detected by the emergency alert detection means, and the content currently included in the data broadcast is not displayed on the display device, a part of the content restored by the data broadcast decoder is sequentially displayed on the display device. Provided is a mobile broadcast receiving terminal.

  According to the mobile broadcast receiving terminal of the present invention, emergency information can be notified to a user more quickly when an emergency alert is issued.

  Embodiments of the present invention will be described below.

  FIG. 1 is a system configuration diagram showing a mobile broadcast receiving terminal 10 according to an embodiment of the present invention. The mobile broadcast receiving terminal 10 includes an antenna 11, a display device 12, a speaker 13, an input device 14, and an IRD (Integrated Receiver and Decoder) 20. The IRD 20 includes a tuner unit 21, a TS processing unit 22, a descrambling unit 23, a control unit 24, a video / audio decoder 25, a data broadcast decoder 26, and an output control unit 27.

  The tuner unit 21 demodulates the digital broadcast radio wave received via the antenna 11 and outputs the demodulation result to the TS processing unit 22 and the control unit 24. The tuner unit 21 includes an RF module 210 and a demodulation / synthesis unit 212, as shown in FIG. The RF module 210 has a plurality of reception modules 211 provided for each of the plurality of antennas 11, and each reception module 211 outputs the received RF signal to the demodulation and synthesis unit 212.

  The demodulating / combining unit 212 performs demodulation after securing the best signal state by the maximum ratio combining method in accordance with the level of the RF signal input from each receiving module 211, and the demodulation result is transmitted to the TS processing unit 22 and the control unit. To 24. In the present embodiment, the tuner unit 21 demodulates the received signal using the maximum ratio combining diversity reception method, but as another form, the tuner unit 21 demodulates the received signal using the selected diversity reception method. It may be a thing.

  The TS processing unit 22 performs processing such as deinterleaving and error detection / correction to restore a TS (Transport Stream) packet. Then, the TS processing unit 22 refers to the PID (Program ID) of the restored TS packet, sends a TS packet containing video or audio to the video / audio decoder 25, and sends a TS packet containing data of data broadcast to the data broadcast decoder 26, a TS packet including control information such as PMT (Program Map Table) is sent to the control unit 24.

  The descrambling unit 23 performs a process of releasing the scramble of data in the course of processing by the TS processing unit 22. The video / audio decoder 25 decodes the TS packet sent from the TS processing unit 22 and outputs video or audio data to the output control unit 27. The data broadcast decoder 26 decodes the TS packet sent from the TS processing unit 22, and outputs data of the data broadcast content to the output control unit 27.

  Here, the content of emergency information transmitted by data broadcasting will be described. For example, as shown in FIG. 3, the content of the emergency information transmitted in the present embodiment is a top page 30 with a text 300 indicating that it is emergency information or an evacuation, and a page indicating a list of areas to be evacuated. The linked link button 301 and link buttons 302 to 304 indicating detailed information of each evacuation target area are displayed. When any of the link buttons 302 to 304 is selected, detailed evacuation information of the selected area is displayed as shown in FIG. 4, for example.

  For example, as shown in FIG. 5, such emergency information content 40 includes top page data 41, page data 42 displayed when the link button 301 is selected, and link button 302 is selected. It consists of page data 43 to be displayed. Reference numeral 44 denotes other content.

  In the present embodiment, each piece of data in one content as shown in FIG. 5 is a group of information displayed on one screen, and is included in a TS packet as one section data. The data broadcast decoder 26 recognizes the boundary of each section data by detecting the boundary in the TS packet, and acquires and decodes each section data.

  In a normal situation where no emergency alert has been issued, the data broadcast decoder 26 does not include all data included in one content (not only data on the top page but also data on all other pages linked from the top page). ) Is restored by the TS processing unit 22, the decoding of the content is started. Thereby, the output control unit 27 can display the content on the display device 12 in the form of one content in which the link destination data of the link button is also decoded.

  On the other hand, when notified from the control unit 24 that the emergency information has been issued, the data broadcast decoder 26 decodes the top page data when the TS packet including the top page data in the content is restored. To start. Each time a TS packet including other data constituting the content is restored by the TS processing unit 22, the TS packet is sequentially decoded. The output control unit 27 displays the top page on the display device 12 with no link destination data.

  As a result, in a situation where an emergency alert is issued, a part (top page) of content including emergency information can be quickly displayed although it is not complete content. In this case, the first action of the user at the time of the disaster can be started earlier by displaying information indicating an emergency or information for calling attention on the top page of the content. Note that the data transmitted first as the content data does not necessarily have to be the top page, and may be only information such as text indicating emergency information, font type, font size, and display color.

  In this embodiment, the video / audio decoder 25 decodes video or audio data transmitted using 12 segments, and the data broadcast decoder 26 transmits data transmitted using one segment. Decode broadcast data. Thereby, the mobile broadcast receiving terminal 10 can receive the data broadcast indicating the emergency information more reliably than the data broadcast transmitted using 12 segments.

  The output control unit 27 outputs the audio decoded by the video / audio decoder 25 to the speaker 13. In addition, the output control unit 27 displays the video decoded by the video / audio decoder 25 and the content decoded by the data broadcast decoder 26 on the display device 12 in accordance with an instruction from the control unit 24. The instructions from the control unit 24 include, for example, displaying either video or content on the entire screen, dividing the screen, displaying video on one side, and content on the other side.

  The control unit 24 extracts a TMCC (Transmission and Multiplexing Configuration and Control) signal from the data demodulated by the tuner unit 21. Here, TMCC is 204-bit information defined by a standard established by the Japan Radio Industry Association (ARIB) and has a data structure as shown in FIG. In B26 in the TMCC signal, an emergency warning broadcast flag is defined. When the value of this flag is 1, it indicates that an emergency warning is issued.

  The control unit 24 monitors whether or not B26 of the TMCC signal is 1, and when detecting that it is 1, the control unit 24 determines the PMT included in the TS packet sent from the TS processing unit 22. Referring to the PMT, it is determined whether or not a descriptor called Emergency_information_descriptor () (hereinafter simply referred to as EID) exists.

  Here, the data structure of EID will be described. The EID has information indicating service_id 50, start_end_flag 51, signal_level 52, and area_code 53, for example, as shown in FIG. service_id 50 indicates a service for performing emergency alert broadcasting. If start_end_flag 51 is 0, it indicates a test broadcast, and if it is 1, it indicates a main broadcast. If signal_level 52 is 0, it indicates a start signal of the first type (earthquake warning, local government head request, etc.), and if it is 1, it indicates that it is a second type (tsunami warning) start signal. area_code 53 indicates the code of the area targeted for emergency information.

  The control unit 24 determines that an emergency alert has been issued when B26 of the TMCC signal is 1 and an EID exists in the PMT. When it is detected that an emergency alert has been issued, the control unit 24 notifies the video / audio decoder 25 that emergency information has been issued. Then, when the content decoded by the data broadcast decoder 26 is not currently displayed on the display device 12, the control unit 24 performs output control so that the content decoded by the data broadcast decoder 26 is displayed on the display device 12. The unit 27 is instructed.

  In this case, the control unit 24 may switch the entire screen of the display device 12 to the content decoded by the data broadcast decoder 26. For example, the control unit 24 divides the screen 60 as shown in FIG. The content 62 decoded by the decoder 26 may be displayed, and on the other hand, the video 61 that has been displayed so far may be continuously displayed.

  Further, the control unit 24 notifies the data broadcast decoder 26 that the emergency information has been canceled and outputs it when B26 of the TMCC signal is 0 and no EID exists in the PMT. The control unit 27 is instructed to perform normal display.

  FIG. 9 is a conceptual diagram showing transition of content displayed on the display device 12.

  In a state where normal contents are being broadcast in normal broadcasting (broadcast when emergency warning is not issued), bit 26th (B26) in TMCC is 0, and emergency warning broadcast is sent to PMT. There is no descriptor (EID). The control unit 24 instructs the output control unit 27 on the display form according to a preset display form, and the normal content is displayed on the display device 12.

  When an emergency warning is issued in this state, the value of B26 in TMCC becomes 1, and EID is described in PMT. The control unit 24 instructs the output control unit 27 to display the data broadcast by the one-segment broadcasting decoded by the data broadcast decoder 26, and the emergency information content is displayed on the display device 12 by dividing the screen.

  When the emergency alert is canceled, B26 in TMCC becomes 0, and a PMT not including EID is transmitted from the broadcasting station. The control unit 24 instructs the output control unit 27 on the display form according to a preset display form, and the normal content is displayed on the display device 12.

  When only one of the value of B26 in the TMCC and the presence / absence of EID in the PMT indicates that emergency information is issued, the control unit 24 determines the value of B26 in the TMCC and the EID in the PMT. The display of the currently displayed content is continued until both the presence / absence of the state indicates that emergency information has been issued.

  FIG. 10 is a flowchart showing an example of the operation of the mobile broadcast receiving terminal 10. For example, the mobile broadcast receiving terminal 10 starts the operation shown in this flowchart at a predetermined timing such as when the power is turned on.

  First, the control unit 24 determines whether or not an emergency alert has been issued (S100). Specifically, the control unit 24 sets BID in the TMCC signal included in the data demodulated by the tuner unit 21 to 1 and EID in the PMT included in the TS packet restored by the TS processing unit 22. It is determined whether or not exists.

  When emergency information is not issued, that is, when B26 in the TMCC signal is 0 and no EID exists in the PMT (S100: No), the mobile broadcast receiving terminal 10 is designated by the user. A normal reception operation for outputting digital broadcasting is executed (S108), and the control unit 24 executes the process shown in step S100 again.

  When emergency information is issued, that is, when B26 in the TMCC signal is 1 and EID is present in the PMT (S100: Yes), the control unit 24 sends the emergency information to the data broadcast decoder 26. In addition, the display device 12 displays the content decoded by the data broadcast decoder 26 when the content decoded by the data broadcast decoder 26 is not currently displayed on the display device 12. The output control unit 27 is instructed.

  Next, the data broadcast decoder 26 refers to the TS packet restored by the TS processing unit 22 and determines whether or not the reception of the first section data of the emergency information content is completed (S101). When reception of the first section data of the emergency information content is completed (S101: Yes), the data broadcast decoder 26 decodes the section data and outputs a part of the data of the emergency information content to the output control unit 27 ( S102). The output control unit 27 displays a part of the emergency information content decoded by the data broadcast decoder 26 on the display device 12 (S103).

  Next, the data broadcast decoder 26 refers to the TS packet restored by the TS processing unit 22 and determines whether or not reception of the next section data is completed (S104). When reception of the next section data is completed (S104: Yes), the data broadcast decoder 26 decodes the section data and outputs a part of the emergency information content data to the output control unit 27 (S105). The output control unit 27 displays a part of the emergency information content corresponding to the data on the display device 12 in accordance with an instruction from the user (S106).

  Next, the data broadcast decoder 26 determines whether or not all section data constituting the emergency information content has been received (S107). If there is unreceived section data in the section data constituting the emergency information content (S107: No), the data broadcast decoder 26 executes the process shown in step S104 again. When all the section data constituting the emergency information content is received (S107: Yes), the control unit 24 executes the process shown in step S100 again.

  The embodiment of the present invention has been described above.

  As is clear from the above description, according to the mobile broadcast receiving terminal 10 of the present invention, emergency information can be notified to the user more quickly when an emergency alert is issued.

  In addition, this invention is not limited to said embodiment, Many deformation | transformation are possible within the range of the summary.

  For example, the IRD 20 further includes a video / audio decoder that decodes video or audio data transmitted using one segment, and a data broadcast that decodes data broadcast data transmitted using 12 segments. If the received signal quality is good, use a video / audio decoder and data broadcast decoder that decodes data transmitted using 12 segments, and if the received signal quality is poor A video / audio decoder and a data broadcast decoder that decode data transmitted using one segment may be used.

  However, even in this case, in the situation where an emergency alert is issued, the data broadcast decoder that decodes the data broadcast transmitted using one segment sequentially decodes from the first section data of the emergency information content Then, the control unit 24 instructs the output control unit 27 to display the content of the emergency information distributed by the data broadcast transmitted using one segment on the display device 12.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in embodiment mentioned above. It will be apparent to those skilled in the art that various modifications or improvements can be made to the above-described embodiment. Furthermore, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

It is a system configuration figure showing mobile broadcast receiving terminal 10 concerning one embodiment of the present invention. 3 is a block diagram illustrating an example of a detailed configuration of a tuner unit 21. FIG. It is a figure which shows an example of the top page 30 of the content which shows emergency information. It is a figure which shows an example of area information. It is a conceptual diagram which shows an example of the data structure of a content. It is a conceptual diagram for demonstrating the structure of a TMCC signal. It is a conceptual diagram for demonstrating the data structure of Emergency_information_descriptor. It is a conceptual diagram which shows an example of the display method of emergency information. It is a conceptual diagram for demonstrating the transition of the content displayed. 5 is a flowchart showing an example of operation of the mobile broadcast receiving terminal 10.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Mobile broadcast receiving terminal, 11 ... Antenna, 12 ... Display device, 13 ... Speaker, 14 ... Input device, 20 ... IRD, 21 ... Tuner part, 210 ... RF module, 211 ... receiving module, 212 ... demodulation and synthesis unit, 22 ... TS processing unit, 23 ... descramble unit, 24 ... control unit, 25 ... video Audio decoder, 26... Data broadcast decoder, 27... Output control unit, 30... Top page, 300... Text, 301. Link button, 304 ... link button, 40 ... content, 41 ... data, 42 ... data, 43 ... data, 44 ... data, 50 ... service_id, 51 ... start_end_flag, 5 ··· signal_level, 53 ··· area_code, 60 ··· screen, 61 ... image, 62 ... content

Claims (3)

A mobile broadcast receiving terminal for receiving a digital broadcast,
TS processing means for restoring a TS (Transport Stream) packet from a signal including digital broadcasting;
A video / audio decoder for restoring a signal indicating video or audio from a TS packet including a signal indicating video or audio;
A data broadcast decoder that restores the content from the TS packet including the content included in the data broadcast;
Display means for displaying the video restored by the video / audio decoder and the content restored by the data broadcast decoder on a display device;
Emergency warning detection means for detecting a signal indicating an emergency warning from a digital broadcast signal,
The TS packet including the content of the data broadcast has section data for each group of data included in the content,
The data broadcast decoder, when an emergency alert is detected by the emergency alert detection means, every time one section data is restored by the TS processing means, by first decoding from the restored section data, Restore part of the content corresponding to the section data,
The display means includes
When an emergency alert is detected by the emergency alert detection means, and the content currently included in the data broadcast is not displayed on the display device, a part of the content restored by the data broadcast decoder is sequentially displayed on the display device. A mobile broadcast receiving terminal. The mobile broadcast receiving terminal according to claim 1,
The display means includes
When an emergency alert is detected by the emergency alert detection means and the content included in the current data broadcast is not displayed on the display device, the content restored by the data broadcast decoder is currently displayed by screen division. A mobile broadcast receiving terminal characterized in that a video image is displayed on a display device. The mobile broadcast receiving terminal according to claim 1 or 2,
The data broadcast decoder includes:
A mobile broadcast receiving terminal, wherein a data broadcast content included in a TS packet is restored from a TS packet transmitted by a broadcasting method using one segment.

Images