JP6465476B2 - Receiver and broadcasting station equipment - Google Patents

Description

  The present invention relates to a receiver and a broadcasting station facility.

  Television broadcast receivers capable of displaying data broadcasts from broadcast stations and operating applications internally have been put into practical use. In recent years, services that combine broadcasting and communication have been put into practical use, and in the future, diversification of applications and linkage between contents of broadcast programs and Internet contents are expected.

  On the other hand, regarding the transmission of broadcast signals using the MMT, the layout setting table for controlling the layout of the screen is disclosed in p. 49-54, “7.3.3.3 Layout Setting Table (LCT)” (particularly, Table 7-12 in p.50). Also, the configuration of the MPU presentation area designation descriptor for designating the display position of the MPU is the same as that described in p. 73-74, “7.4.3.4 MPU Presentation Area Specification Descriptor”.

“ARIB STD-B60 Version 1.0 Standard Standard Media Transport Method by MMT in Digital Broadcasting”, General Incorporated Association Radio Industry Association, July 31, 2014

  According to the above-described conventional technology, it is possible to appropriately lay out and display a broadcast video or the like on the television receiver side based on a broadcast signal composed of a plurality of assets. However, as described above, forced to switch to emergency news video while watching data broadcasting, hybrid cast, video on demand (VOD), electronic program guide (EPG), etc. There was a problem that it was not possible to do it. That is, since the display by various applications or the like is overlaid on the broadcast video, there has been a situation where the emergency information that the broadcast station should preferentially convey to the viewer is overlooked.

  The present invention has been made in view of the above circumstances, and even when output from an application, an electronic program guide, or the like is displayed on a screen, an image including emergency information is reliably received. It is desirable that the broadcast station can forcibly switch the screen so that it can be displayed on the screen of the machine. The present invention provides a receiver and broadcasting station equipment for solving this problem.

  [1] In order to solve the above problems, a receiver according to an aspect of the present invention receives a content signal in which a plurality of assets and control information are multiplexed, separates the content signal for each asset, and controls information. A multimedia decoder unit that extracts the application, an application execution unit that executes an application and outputs a display from the application, an application control unit that controls a life cycle of the application in the application execution unit, and the multimedia decoder unit A video composition unit that synthesizes a video based on the separated video asset with a display from an application executed by the application execution unit, a video output unit that outputs a video obtained as a result of the synthesis by the video composition unit, Said The emergency instruction information indicating whether or not the video separated by the multimedia decoder unit is emergency information is acquired from the multimedia decoder unit, and the emergency instruction information indicates that the video is emergency information. In this case, a layout control unit that instructs the application control unit to stop the application being executed by the application execution unit is provided.

  [2] Further, according to one aspect of the present invention, in the above receiver, a program guide data acquisition unit that receives electronic program guide data from the multimedia decoder unit and outputs a program guide based on the electronic program guide data The video composition unit further synthesizes the program table output from the program table data acquisition unit with the video, and the layout control unit includes the video as emergency information. When the emergency instruction information indicates that there is, the output of the program guide from the program guide data acquisition unit is instructed to be stopped.

  [3] Further, according to an aspect of the present invention, in the above receiver, the emergency instruction information is stored and transmitted in a layer order which is a data item in a layout setting table, and the multimedia decoder unit Passes the emergency instruction information extracted from the layer order in the layout setting table to the layout control unit.

  [4] In addition, the broadcasting station equipment according to one aspect of the present invention switches between whether to send a normal program or emergency information for each of the video and audio to be transmitted, and outputs the video and the audio. A switching control signal for switching whether to transmit the normal program or the emergency information to the information switching device and the emergency information switching device is supplied, and the normal program is included in the control information to be transmitted. A transmission control device that controls to store emergency instruction information indicating whether to send or to send the emergency information, the video and audio output from the emergency information switching device, and a control including the emergency instruction information And a multiplexing device that multiplexes and outputs information.

  [5] In addition, according to an aspect of the present invention, the emergency instruction information is stored in a layer order that is a data item in a layout setting table, multiplexed, and output in the broadcasting station equipment. .

  According to the present invention, even when emergency information (news or the like) is generated, even when the display from the application is output, the display from the application is terminated, and the video (and audio) based on the emergency information is displayed. Viewers can watch. From the broadcasting station side, the certainty of viewing important emergency information increases.

It is a block diagram which shows schematic function structure of the receiver by 1st Embodiment of this invention. It is a functional block diagram which shows the structure of the broadcasting station equipment by the same embodiment. It is the schematic which shows the data structure of the layout setting table which the receiver 1 by the same embodiment receives as a part of control signal, and a data example. It is the schematic which shows the example of the MPU presentation area | region designation | designated descriptor in the asset loop of the MP table which the receiver 1 by the same embodiment receives as a part of control signal. It is the schematic which shows the example of the change of a screen output by ON / OFF of layout control in the receiver 1 by the embodiment.

[First Embodiment]
Next, an embodiment of the present invention will be described with reference to the drawings. The main devices or device groups constituting this embodiment are the receiver 1 and the broadcasting station equipment 100. The receiver 1 is a television receiver and is installed, for example, in a private house or other places. The receiver 1 may be portable. The broadcasting station facility 100 is a facility that a television station has, and is mainly for transmitting broadcast signals. A so-called television broadcast is transmitted using broadcast waves (radio waves) or cable television signals, but transmission by MMT (MPEG media transport) does not depend on a physical transmission medium. Video content similar to that of television broadcasting can also be received via communication such as the Internet. Further, the television broadcast itself may be distributed via the Internet.

  FIG. 1 is a block diagram showing a schematic functional configuration of a receiver according to the embodiment. As shown in the figure, the receiver 1 includes a tuner unit 11, an IP communication unit 12, an MMT decoder unit 15 (multimedia decoder unit), an audio decompression decoder unit 21, a video decompression decoder unit 22, and an EPG. Acquisition unit 23 (program guide data acquisition unit), built-in sound source supply unit 24, audio synthesis unit 25, audio output unit 26, video synthesis unit 27, video output unit 28, layout control unit 31, application The control unit 45 includes a cache memory 46 and an application execution unit 47.

  The tuner unit 11 receives a broadcast signal from the outside, and selects and acquires a signal having a desired frequency (channel). The broadcast signal is, for example, transmitted as a radio wave or transmitted through a cable for cable television, and is received by the receiver 1.

  The IP communication unit 12 communicates with an external device or the like using an Internet protocol (IP). This communication is performed using means of a wired signal (such as an optical cable or a metal cable) or a wireless signal (such as a communication service provided by a communication carrier or a wireless LAN). This communication is performed, for example, via the Internet. The IP communication unit 12 receives, for example, a video content signal or the like from a broadcast station side equipment or a server device of a video content distribution company using an IP protocol.

The MMT decoder unit 15 receives and decodes the video content signal received by the tuner unit 11 and the video content signal received by the IP communication unit 12. The signal received by the MMT decoder unit 15 is multiplexed by the MMT method, and includes video assets, audio assets, data assets, data assets, and the like. Further, the signal received by the MMT decoder unit 15 includes control information. This control information includes a layout setting table, an MP table, and other tables. Then, the MMT decoder unit 15 supplies the extracted audio asset data to the audio decompression decoder unit 21. Further, the MMT decoder unit 15 supplies information of an electronic program guide (EPG) extracted from the received signal to the EPG acquisition unit 23. The information of the electronic program guide is transmitted, for example, in a form included in service information in a broadcast signal. The MMT decoder unit 15 supplies the layout control unit 31 with information related to layout control among the control information extracted from the supplied signal. Further, the MMT decoder unit 15 passes the event message extracted from the broadcast signal to an application operating on the application execution unit 47.
That is, the MMT decoder unit 15 receives a content signal in which a plurality of assets and control information are multiplexed, separates the content signal for each asset, and extracts control information.

The voice decompression decoder unit 21 decompresses the voice data supplied from the MMT decoder unit 15 and supplies the voice data to the voice synthesis unit 25.
The video decompression decoder unit 22 decodes the video data supplied from the MMT decoder unit 15 and supplies the video data to the video composition unit 27 as video having a predetermined number of pixels and a predetermined frame rate.

The EPG acquisition unit 23 forms a program table in an easy-to-view format based on the electronic program table data supplied from the MMT decoder unit and the operation from the user, and supplies it to the video composition unit 27. The EPG acquisition unit 23 normally outputs a program guide for one or a plurality of services (channels) and time zones desired by the user when the user of the receiver 1 operates buttons on the remote control device or the like. Similarly, when the user switches the screen to the TV broadcast program video based on the remote control operation or the like, the EPG acquisition unit 23 stops outputting the program guide. In addition, when the EPG acquisition unit 23 receives an instruction from the layout control unit 31 to stop the output of the program guide, the EPG acquisition unit 23 stops the output of the program guide that has been output at that time.
That is, the EPG acquisition unit 23 receives the electronic program guide data from the MMT decoder unit 15 and outputs the program guide based on the electronic program guide data.

The built-in sound source supply unit 24 stores the data of the built-in sound source in advance in the internal memory, and supplies the designated sound source data to the speech synthesis unit 25 based on an instruction from an application or the like running on the application execution unit 47. To do.
The voice synthesis unit 25 mixes the voice received from the voice decompression decoder unit 21 and the sound source supplied from the built-in sound source supply unit 24 and supplies the mixed sound to the voice output unit 26.
The voice output unit 26 outputs the voice supplied from the voice synthesis unit 25. A speaker or the like for outputting sound may be provided inside the receiver 1 or may exist outside the receiver 1.

The video composition unit 27 synthesizes the output from the video decompression decoder unit 22, the output from the EPG acquisition unit 23, and the output of characters, video, images, etc. from the application executed on the application execution unit 47, This is supplied to the video output unit 28. Note that the video composition unit 27 may further synthesize a layout composed of text based on subtitle assets and a layout composed of text based on character super assets. The video composition unit 27 determines the layout of each display element (video, characters, etc.) based on the layout control information when composing the above-described video and the like, but detailed description thereof is omitted here. As will be described later, the video received by the video composition unit 27 from the application execution unit 47 includes content based on data broadcasting.
That is, the video composition unit 27 synthesizes the video based on the video asset separated by the MMT decoder unit 15 with the display from the application executed by the application execution unit 47. In addition, the video composition unit 27 further synthesizes the program table output from the EPG acquisition unit 23 with the video.

  The video output unit 28 receives the video signal synthesized by the video synthesis unit 27 and outputs the video. A display device for outputting video may be provided inside the receiver 1 or may exist outside the receiver 1.

The layout control unit 31 receives layout control information, which is information for controlling the video layout, from the MMT decoder unit 15. In the present embodiment, the layout control information includes emergency instruction information indicating whether the received video and audio are emergency information. In the present embodiment, the emergency instruction information is stored in the layer order in the layout setting table in the layout control information. Details thereof will be described later. Then, the layout control unit 31 determines whether the current video and audio are emergency information (emergency news, emergency disaster information, etc.) based on the acquired emergency instruction information. As a result of the determination, if the current video and audio are emergency information, the layout control unit 31 performs control so that video and audio that may interfere with the presentation of the emergency information are not output. Specifically, when the current video and audio are emergency information, the layout control unit 31 stops the running application in the application execution unit 47 and outputs the program guide from the EPG acquisition unit 23. Stop it.
That is, the layout control unit 31 acquires emergency instruction information indicating whether or not the video separated by the MMT decoder unit 15 is emergency information from the MMT decoder unit 15, and indicates that the video is emergency information. If the information indicates, the application control unit 45 is instructed to stop the application being executed by the application execution unit 47. Also, the layout control unit 31 instructs the output of the program guide from the EPG acquisition unit 23 to be stopped when the emergency instruction information indicates that the video is emergency information.

The application control unit 45 controls the execution of the application in the application execution unit 47. For example, the application control unit 45 controls the life cycle (fetch, activation, stop, etc.) of the application. The application control unit 45 acquires an application information table (AIT) (not shown) via the IP communication unit 12 as necessary. Then, the application control unit 45 acquires the code of the application based on the acquired application control table, and starts and stops the application based on the operation from the user or in conjunction with the broadcast service. To do. When a valid code of the application is stored in the cache memory 46, the application control unit 45 reads the code from the cache and activates it by the application execution unit 47. Further, the application control unit 45 may stop all running applications at once based on an instruction from the layout control unit 31.
That is, the application control unit 45 controls the life cycle of the application in the application execution unit 47.

  The cache memory 46 is a storage unit for storing the acquired application code in the receiver 1. The cache memory 46 is realized using, for example, a semiconductor memory.

The application execution unit 47 is an environment in which an application can be executed based on control by the application control unit 45. As a specific example, the application execution unit 47 is realized by using an HTML5 browser, and presents or executes a code described in HTML5 and JavaScript (registered trademark). When the application execution unit 47 receives an event message from the MMT decoder unit 15, the application execution unit 47 passes the message to a necessary application. Note that the application execution unit 47 passes the video and audio output by each application to the video synthesis unit 27 and the audio synthesis unit 25, respectively. At this time, for the sound, the sound source supplied from the built-in sound source supply unit 24 is used.
That is, the application execution unit 47 executes the application and outputs a display from the application.

  There are various types of applications. One of the applications executed in the application execution unit 47 has a function of arranging and outputting data distributed by data broadcasting in an appropriate format. Another application has a function of enabling a user to view video on demand (VOD).

Next, the configuration of an apparatus and the like on the side of transmitting contents such as video received by the receiver 1 will be described.
FIG. 2 is a functional configuration diagram showing the configuration of the broadcasting station equipment in the present embodiment. As shown in the figure, the broadcasting station equipment 100 includes a transmission control device 51, an emergency information switching device 52, an MMT control information transmission unit 71, an audio compression encoder unit 72, a video compression encoder unit 73, and data broadcasting. The transmission unit 74 includes an EPG transmission unit 75, a multiplexing device 81, a modulation / transmitter 82, an IP communication device 83, and an application server device 91.

The transmission control device 51 is a device that performs control related to transmission of broadcast signals. As one of the controls, it is distinguished whether a broadcast based on a normal program or a broadcast based on emergency information is transmitted, and a signal corresponding to the distinction is output. Specifically, the transmission control device 51 takes in a signal related to the occurrence of emergency information from the outside. Based on this signal, the transmission control device 51 distinguishes whether the video and audio to be currently transmitted are those of normal broadcasting or emergency information. Then, the transmission control device 51 supplies a switching control signal to the emergency information switching device 52 according to the distinction. Further, the transmission control device 51 includes emergency instruction information corresponding to the distinction as a part of the layout control information and supplies it to the MMT control information transmission unit 71. Details of the emergency instruction information will be described later.
That is, the transmission control device 51 supplies a switching control signal for switching whether to send a normal program or emergency information to the emergency information switching device 52, and the normal program is included in the control information to be transmitted. Control is performed to store emergency instruction information indicating whether to send or emergency information.

The emergency information switching device 52 has a function of switching whether to transmit a normal program or an emergency broadcast for each of video and audio based on control from the transmission control device 51. Specifically, the emergency information switching device 52 can input the video of the normal program and the video of the emergency broadcast, and outputs the video of the normal program at the normal time. Then, when the switching control signal from the transmission control device 51 indicates “emergency information generation”, the emergency information switching device 52 performs switching and outputs an emergency broadcast video. Similarly for the audio, the emergency information switching device 52 can input the audio of the normal program and the audio of the emergency broadcast, and outputs the audio of the normal program at the normal time. When the switching control signal from the transmission control device 51 indicates “emergency information generation”, the emergency information switching device 52 performs switching and outputs an emergency broadcast sound.
That is, the emergency information switching device 52 switches whether to send a normal program or emergency information for each of video and audio to be sent.

The MMT control information sending unit 71 generates a control signal for transmitting a broadcast signal by MMT. When generating this control signal, the MMT control information sending unit 71 receives necessary layout control information from the sending control device 51. The layout control information supplied from the transmission control device 51 includes emergency instruction information. This emergency instruction information indicates whether the video and audio to be transmitted are related to emergency information or are based on normal broadcasting. In this embodiment, as will be described later, the MMT control information sending unit 71 stores this emergency instruction information in layer_order, which is a data item in the layout setting table.
That is, the MMT control information transmission unit 71 stores the emergency instruction information in the layer order that is a data item in the layout setting table.

The audio compression encoder unit 72 encodes and outputs the audio signal output from the emergency information switching device 52 by a predetermined method.
The video compression encoder unit 73 encodes and outputs the video signal output from the emergency information switching device 52 by a predetermined method.
The data broadcast transmission unit 74 outputs data to be transmitted as a data broadcast.
The EPG sending unit 75 outputs information of an electronic program guide (EPG).

The multiplexing device 81 includes control information output from the MMT control information transmission unit 71, audio data output from the audio compression encoder unit 72, video data output from the video compression encoder unit 73, and data broadcasting. Data for data broadcasting output from the transmission unit 74 and program guide data output from the EPG transmission unit 75 are multiplexed in a format for transmission by MMT. Then, the multiplexing device 81 transmits the multiplexed data from either the modulation / transmitter 82 or the IP communication device 83. Note that the multiplexing device 81 may further multiplex data other than the above (for example, subtitle text data, character supertext data, etc.).
That is, the multiplexing device 81 multiplexes and outputs at least the video and audio output from the emergency information switching device 52 and the control information including the emergency instruction information.

The modulator / transmitter 82 transmits data output from the multiplexer 81 as a broadcast wave. The broadcast wave transmitted from the modulator / transmitter 82 is radiated from the antenna. The modulator / transmitter 82 may perform transmission via a cable for cable television.
The IP communication device 83 transmits the data output from the multiplexing device 81 to the outside via a network by communication using the IP protocol. This network is, for example, the Internet. The IP communication device 83 mediates bi-directional communication between the receiver 1 and the application server device 91 using the IP protocol.

  The application server device 91 performs communication with an external device via the communication network via the IP communication device 83. For example, the application server device 91 sends necessary data to the application in response to a request from an application operating in the receiver 1.

  As described above, according to the broadcasting station equipment 100, it is possible to switch between transmission of video and audio by normal broadcasting and transmission of video and audio by emergency information. Moreover, according to this broadcasting station equipment 100, emergency instruction information can be included in MMT control information for transmission. Thereby, the receiver 1 side can perform layout control according to the emergency instruction information. Specifically, on the receiver 1 side, when broadcasting by emergency information starts, the application is stopped or the display of the electronic program guide is stopped. Thereby, the receiver 1 can present the video and audio of emergency information without being disturbed by the output from the application or the display of the electronic program guide.

Next, information for controlling the video layout will be described.
FIG. 3 is a schematic diagram illustrating a data configuration of a layout configuration table (Layout Configuration Table, LCT) received by the receiver 1 as a part of a video content control signal, and a data example. In the figure, the data structure is represented by a language having a block structure. The numerical value added to each data item is the size (number of bits) of the data item. The layout setting table is included in a PA (Package Access) message.

  In this embodiment, emergency instruction information is stored in the layout setting table. In this embodiment, the data item of layer_order (layer order) in the layout setting table is used to store emergency instruction information. By storing emergency instruction information in layer_order in this way, there is no need to change the existing data structure, and the compatibility with the conventional standard is increased.

  However, it is not essential to store the emergency instruction information in the existing data items in the layout setting table, and in any table in the control information transmitted from the broadcasting station equipment 100 side to the receiver 1 side, A new data item for emergency instruction information may be provided. As an example, a new data item may be provided in the layout setting table.

As shown in the figure, the layout setting table has a double loop structure. The outer loop corresponds to a combination of layout number and device ID. The inner loop corresponds to the region number.
Each item in the layout setting table will be described below.
(1) number_of_loop (number of layout devices) indicates the total number of combinations of layouts and devices set in this table.

Data items included in the following ranges (2) to (10) are repeated N times for each combination of layout and device. Here, N is an integer indicated by the number_of_loop described above.
(2) layout_number (layout number) indicates the number of each layout. The layout number “0” corresponds to the default layout setting. One layout can be composed of a plurality of devices.
(3) device_id (device ID) indicates the number of the client terminal. The device ID “0” corresponds to the main device.
(4) number_of_region (number of regions) indicates the number of regions in the device of the layout.

The following data items (5) to (10) are repeated M times for each region of the device in the layout. Here, M is an integer indicated by the number_of_region.
(5) region_number (region number) indicates the number of each region. The area number “0” is a default area number. Note that different area numbers are assigned to different devices of the same layout.
(6) left_top_pos_x (upper left horizontal position) indicates the upper left horizontal position (x coordinate) of the area as a ratio (percentage) to the total number of pixels in the horizontal direction. The left side of the full screen display is 0, and the right side of the full screen display is 100.
(7) left_top_pos_y (upper left vertical position) indicates the upper left vertical position (y coordinate) of the area as a ratio (percentage) to the total number of pixels in the vertical direction. The upper side of the full screen display is 0, and the lower side of the full screen display is 100.
(8) right_down_pos_x (lower right horizontal position) indicates the lower right horizontal position of the area as a percentage of the total number of pixels in the horizontal direction.
(9) right_down_pos_y (lower right vertical position) indicates the lower right vertical position of the area as a percentage of the total number of pixels in the vertical direction.
(10) layer_order (layer order) indicates the relative position of the area in the depth direction. As described above, in this embodiment, emergency instruction information is stored in this data item. That is, layer_order (layer order) indicates whether or not the contents of the video asset and audio asset transmitted most recently are emergency information. The emergency information is, for example, emergency earthquake bulletins, emergency news, emergency information that requires an emergency, and the like. Specifically, when the value of layer_order is “1”, it represents “emergency instruction”, and when the value of layer_order is “0”, it represents “not an emergency instruction”. Note that the correspondence between the value and the meaning may be changed as appropriate.

  The data example of the layout setting table shown in FIG. 3 includes two layouts. That is, the value of number_of_loop is “2”. Each of these layouts corresponds to one device ID. That is, there are two combinations of layout number and device ID, each of which corresponds to an outer loop in the layout setting table.

  First layout: The layout number of the first layout is “0”. The device ID is “0”. This layout includes one area. That is, the value of number_of_region is “1”. The region number (region_number) of the region is “0”. When the range of this area is expressed by the xy coordinates of percentage values, the upper left is (x, y) = (0, 0), and the lower right is (x, y) = (100, 100). In this case, the value of layer_order (layer order) is “0”, which represents “not an emergency instruction”.

  Second layout: The layout number of the second layout is “1”. The device ID is “0”. This layout includes one area. That is, the value of number_of_region is “1”. The region number (region_number) of the region is “0”. When the range of this area is expressed by the xy coordinates of percentage values, the upper left is (x, y) = (0, 0), and the lower right is (x, y) = (100, 100). Here, the value of layer_order (layer order) is “1”, which represents “emergency instruction”.

  In the following, for convenience, the layout designated by the layout number “0” is called “layout control OFF”, and the layout designated by the layout number “1” is called “layout control ON”.

  FIG. 4 is a schematic diagram illustrating an example of an MPU presentation area designation descriptor in an asset loop of a transmitted MP (MMT Package) table. MPU is an abbreviation for Media Processing Unit. In the figure, (A) indicates that “layout control is OFF”, and (B) indicates that “layout control is ON”.

In FIG. 4A, the value “0x8003” of descriptor_tag (descriptor tag) represents that this descriptor is an MPU presentation area designation descriptor. Descriptor_length (descriptor length) represents the size of the descriptor and is set to an appropriate value. Further, mpu_sequence_number (MPU sequence number) is XX, layout_number (layout number) is “0”, and region_number (region number) is “0”.
In FIG. 5B, descriptor_tag (descriptor tag) and descriptor_length (descriptor length) are the same as in FIG. The example shown in FIG. 5B includes one loop, mpu_sequence_number (MPU sequence number) set in the loop is YY, layout_number (layout number) is “1”, The region_number (region number) is “0”.
The above XX and YY represent appropriate values to be set.

  That is, in the MPU presentation area designation descriptor shown in FIG. 4, the layout control is turned off at the MPU sequence number XX, that is, the layout number “0” is designated. Further, the layout control is turned on at the MPU sequence number YY, that is, the layout number “1” is designated.

  The operation of the layout control unit 31 based on the layout control information illustrated in FIGS. 3 and 4 is as follows. That is, the layout control unit 31 monitors the value of the emergency instruction information in the signal received by the receiver 1. Specifically, the layout control unit 31 monitors the value of layer_order in each layout in the layout setting table.

  When the value of the emergency instruction information is “0”, the layout control unit 31 performs no special action on the application control unit 45 or the EPG acquisition unit 23. Therefore, in this case, the video composition unit 27 displays a normal broadcast video, a program table output from the EPG acquisition unit 23, and an output from an application running on the application execution unit 47 in a designated layout. Synthesize. Here, the designated layout refers to the coordinate area on the screen where the received video or the like of the specific asset is displayed, the order of the context of overlapping (overlaid) presentation elements, the application Screen output specifying the coordinates from. At this time, depending on the designation of the layout, the broadcast video may be covered with an output from an application or an electronic program guide.

When the value of the emergency instruction information is “1”, the layout control unit 31 instructs the application control unit 45 to stop all running applications. Based on this instruction, the application control unit 45 stops all the running applications in the application execution unit 47. Thereby, the video output from the application execution unit 47 to the video synthesis unit 27 and the audio output to the voice synthesis unit 25 are stopped. When the value of the emergency instruction information is “1”, the layout control unit 31 instructs the EPG acquisition unit 23 to stop outputting the electronic program guide. Thereby, the EPG acquisition unit 23 stops the display even during the display output in the electronic program. As a result, the video is not passed from the application execution unit 47 or the EPG acquisition unit 23 to the video composition unit 27. Therefore, the video composition unit 27 supplies the video output from the video decompression decoder unit 22 to the video output unit 28 without being covered by the output from the application or the like. That is, the video and audio from the emergency information broadcast are reliably transmitted to the viewer.
When the value of the emergency instruction information is a non-zero value other than “1”, the same operation as when the value of the emergency instruction information is “1” may be performed.

  FIG. 5 is a schematic diagram illustrating an example of a screen change caused by layout control ON or OFF. In the figure, the screen example shown on the left side is in a state where layout control is OFF. The screen example shown on the right side is in a state where layout control is ON. In the screen example on the left, output from an application by data broadcasting or hybrid casting is displayed. Hybrid cast refers to a service realized by integrating television broadcasting and communication over the Internet. On the left screen, since the user is viewing the output from these data broadcasts or hybrid applications, there is no particular problem even if a normal broadcast video is hidden behind this screen. Here, it is assumed that emergency news broadcasting starts. The video and audio are switched from the normal broadcast to the emergency broadcast by the operation of each device on the broadcast station equipment side already described. On the broadcasting station equipment side, the layout_number of the MPU presentation area designation descriptor for video and audio is changed from “0” to “1”. As a result, the receiver 1 side shifts to the layout control ON state by the operation already described. Then, according to the instruction from the layout control unit 31, all applications including the data broadcast presentation are stopped. When the electronic program guide is displayed, the display of the electronic program guide is also stopped. That is, the video output from the receiver 1 is switched to a broadcast video. As described above, as a result of shifting to the layout control ON, the emergency news broadcast video on the right side is displayed. When the emergency news broadcast ends and the program returns to the normal program, the video and audio are switched from the emergency broadcast to the normal broadcast by the operation of each device on the broadcasting station equipment side. On the broadcasting station equipment side, the layout_number of the MPU presentation area designation descriptor for video and audio is changed from “1” to “0”. As a result, the receiver 1 side shifts to the layout control OFF state. When the layout control is turned off, the application can be newly activated, and the screen returns to the left screen example in FIG.

  In this embodiment, no MPU presentation area designation descriptor is arranged for data broadcasting assets. The reason is that the data is transmitted after being encapsulated in MPU (MPU with non-timed media data). However, a plane for displaying data broadcasting is a multimedia plane, which is also a plane for displaying video. Since the data broadcast asset assumes that the layer_order (layer order) is “0”, the data broadcast asset is hidden behind the video asset during the broadcast of emergency information.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. Note that the description of matters similar to those in the first embodiment is omitted here, and matters specific to the present embodiment are mainly described.
The functional configuration of each device (the receiver 1 and each device in the broadcasting station facility 100) in the second embodiment is substantially the same as those in the first embodiment.
However, in the second embodiment, the notification method from the broadcasting station equipment 100 side to the receiver 1 side when emergency information occurs is different from that in the first embodiment.

  In the first embodiment, on the layout setting table, the layout (for example, layout number 0) in which the emergency instruction information is “0” (represents normal broadcast) and the emergency instruction information is “1” (represents emergency information). ) Is always stored (for example, layout number 1). Such a layout setting table is transmitted from the broadcasting station equipment 100 side. Then, the layout to be used on the receiver 1 side is instructed depending on whether “0” or “1” is designated as the layout number of the MPU presentation area designation descriptor in the video asset or audio asset. That is, in this example, when the layout number 0 is designated, the broadcast is normal, and when the layout number 1 is designated, it is emergency information.

  On the other hand, in the present embodiment, the broadcasting station equipment 100 switches the emergency instruction information in a predetermined layout to “0” or “1” and sends a signal to the receiver 1 by switching. On the other hand, it tells whether the currently transmitted video or the like is a normal broadcast or emergency information. That is, in the broadcast station equipment 100, the emergency instruction information in the layout to be referred to on the receiver 1 side is set to “0” in the control information transmitted by the MMT control information transmitting unit 71 according to the instruction from the transmission control device 51. Switch with “1”.

  The receiver 1 refers to the designated layout in the layout setting table in accordance with the layout number designated in the MPU presentation area designation descriptor, and uses the emergency instruction information in the layout to display the current video etc. Is the normal broadcast or emergency information, and if it is emergency information, an operation such as stopping the application (operation as described in the first embodiment) is performed. Therefore, even when the signal of this embodiment is sent from the broadcasting station equipment 100 side, emergency information can be reliably delivered to the viewer, as in the first embodiment.

[Implementation by computer program]
In addition, you may make it implement | achieve a part or all of the function of each apparatus in 1st Embodiment mentioned above or 2nd Embodiment with a computer. In that case, the program for realizing the function of each device may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible disk, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, a “computer-readable recording medium” dynamically holds a program for a short time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client in that case may be included, and a program that holds a program for a certain period of time. The program may be a program for realizing a part of the above-described functions, or may be a program that can realize the above-described functions in combination with a program already recorded in a computer system.

Although a plurality of embodiments have been described above, the present invention can also be implemented in the following examples.
The receiver 1 may not include the EPG acquisition unit 23. In this case, the layout control unit 31 does not control the EPG acquisition unit 23 even during an emergency broadcast, and only controls the forced termination of the application.
The location for storing the emergency instruction information is not limited to layer_order in the layout setting table. A storage area for emergency instruction information may be newly provided.
In the above-described embodiment, the signal is transmitted from the broadcasting station equipment 100 side to the receiver 1 side by MMT, but the transmission method is not limited to MMT. Even in transmission systems other than MMT, it is possible to transmit emergency instruction information from the broadcasting station equipment 100 side to the receiver 1 side as part of the control information, and perform similar control on the receiver 1 side.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

  The present invention can be used for television broadcasting and content distribution services.

1 receiver 11 tuner unit 12 IP communication unit 15 MMT decoder unit (multimedia decoder unit)
21 audio decompression decoder unit 22 video decompression decoder unit 23 EPG acquisition unit (program table data acquisition unit)
24 internal sound source supply unit 25 audio synthesis unit 26 audio output unit 27 video synthesis unit 28 video output unit 31 layout control unit 45 application control unit 46 cache memory 47 application execution unit 51 transmission control device 52 emergency information switching device 71 MMT control information transmission Unit 72 audio compression encoder unit 73 video compression encoder unit 74 data broadcast transmission unit 75 EPG transmission unit 81 multiplexing device 82 modulation / transmitter 83 IP communication device 91 application server device 100 broadcast station equipment

Claims (1)

A multimedia decoder unit that receives a content signal in which a plurality of assets and control information are multiplexed by the MMT method, separates the content signal for each asset, and extracts control information;
An application execution unit that executes an application and outputs a display from the application;
An application control unit that controls the life cycle of the application in the application execution unit;
A video composition unit that synthesizes a video based on the video asset separated by the multimedia decoder unit with a display from an application executed by the application execution unit;
A video output unit for outputting a video obtained as a result of the synthesis by the video synthesis unit;
The emergency instruction information indicating whether the video separated by the multimedia decoder unit is emergency information is acquired from the multimedia decoder unit, and the emergency instruction information indicates that the video is emergency information. A layout control unit that instructs the application control unit to stop the application being executed by the application execution unit,
Equipped with,
The emergency instruction information is stored in a PA (Package Access) message.
Receiver you wherein a.

Images