JP2007282082A - Digital broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcast receiver in which easiness in watching superimposed characters of an emergency broadcast is improved even while viewing any video image within a range not disturbing a user in viewing more than needed during multi-picture display and reduction of costs is attained. <P>SOLUTION: When an emergency broadcast is received by an OOB tuner part 118 and an OOB decode part 119, a picture control part 116 refers to information obtained by an emergency broadcast information acquiring means 105 and when it is high-priority information, an aspect and a reduction scale are set to a main video processing part 108 and a sub video processing part 109 so as to expand a picture at a side where characters are superimposed, to a maximum, and multi-picture display is performed by a video compositing part 110. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a digital broadcast receiving apparatus that displays video and text information related to emergency broadcasting.

  In digital broadcasting, a broadcaster multiplexes and broadcasts video, audio, and text information data related to a plurality of programs in a transport stream (TS), and these are selectively demodulated and reproduced by a receiver. You can watch channels and get various information.

  One of the services provided by taking advantage of digital broadcasts is emergency broadcasts that let you know information that requires immediate response, such as natural disasters such as earthquakes and high-priority news bulletins. A conventional digital broadcast receiving apparatus extracts character superimposition data having common identification information different from the program currently being viewed by the user from a digital broadcast wave, and performs a process of displaying the superimposed data on the image receiving screen. Information can be displayed on the screen and presented to the user immediately (see, for example, Patent Document 1).

In general, a digital broadcast receiver generally includes an external input terminal, and can display a playback image of an externally connected device such as a DVD on a screen. Here, by performing a process of superimposing the character supermarket extracted from the digital broadcast wave during the emergency broadcast on the external input video, the text information is immediately displayed on the screen even when the user is viewing the external input video. It can be presented to the user (see, for example, Patent Document 2).
JP 2001-045444 A Japanese Patent Laid-Open No. 2003-230068

  However, if the digital broadcast receiving apparatus has a multi-screen display function that can display a plurality of videos including external input video on the same screen, generally, the received video is mainly used for multi-screen display. Since the display area is reduced to 1/2 to 3/4 of the entire screen when arranged on the screen, especially when it is arranged on the sub-screen, the conventional configuration, for example, in Patent Document 1 In the configuration, as a means to make it easier to see the character supermarket during emergency broadcasting, a background color is provided on the OSD that composes the character superposition and is combined with the received video image, or the received video image is reduced at a certain rate by performing resolution conversion processing. Although the overlap with the display area of the character super can be prevented, the character super is in a reduced state, which has a problem in viewability.

  Similarly, in the configuration of Patent Document 2, for example, when the user is viewing the digital broadcast channel image being received on the main screen and displaying the external input image on the sub-screen on the main screen, The video after combining the character super is displayed on the sub-screen, and the display of the character super is still reduced. Here, there is a method that can be solved by making the output part of the OSD constituting the character super completely independent from the video output and adding the OSD composition processing part after the multi-screen composition processing part. A resolution conversion unit and a display position adjustment unit for displaying the character superimposition at an appropriate position on the entire screen are further required, which causes a problem in that the configuration of the digital reception device is complicated and the cost is increased.

  In any of the conventional configurations described above, for example, when the digital tuner is receiving a cable TV, only the emergency broadcast data existing in the same TS, that is, generally in the same physical channel, can be extracted, and the emergency broadcast is transmitted. When a channel that is not being received is being received, the superimpose text superimpose cannot be displayed on the screen, so there is a problem with quick response.

  The present invention solves the above-mentioned conventional problems. First, it improves the supervision of emergency broadcast text supervision during multi-screen display, and secondly, any video is being viewed during multi-screen display. Another object of the present invention is to provide a digital broadcast receiving device that improves the visibility of the emergency broadcast text supervision.

  Thirdly, an object of the present invention is to provide a digital broadcast receiving apparatus that achieves cost reduction in realizing the object.

  In order to achieve the above object, the digital broadcast receiving apparatus of the present invention has means for displaying an emergency broadcast text superimposition on the image receiving screen, and includes an input video from an external device on the same screen. It has means for multi-screen display, resolution conversion means for arbitrarily changing the aspect ratio or scale ratio of each screen, and the aspect ratio or scale ratio of the screen on which character superimposition is superimposed based on the acquired emergency broadcast information Control.

  By this configuration, the aspect ratio or scale ratio of the screen on which the character superimposition is superimposed can be controlled and changed based on the acquired emergency broadcast information, so that the character supermarket can be automatically enlarged and displayed when the emergency broadcast is received. Is the most important feature.

  In addition, the digital broadcast receiving apparatus of the present invention has means for acquiring emergency broadcast information by receiving data superimposed on an out-of-band signal of a digital broadcast wave, and text based on the emergency broadcast information acquired from the out-of-band signal. Control the aspect ratio or scale ratio of the superimposed screen.

  This configuration is receiving a TS to which emergency broadcast information has been sent out by controlling the aspect ratio or scale ratio of the screen on which the character superimposition is superimposed based on the emergency broadcast information acquired from the out-of-band signal. Regardless of whether or not, the character super is automatically enlarged and displayed.

According to the digital broadcast receiving apparatus of the present invention, firstly, the aspect ratio or scale ratio of the screen is enlarged when the superimpose at the time of emergency broadcast reception is displayed on a multi-screen, especially when it is reduced on the sub-screen. This improves the legibility of emergency broadcast text supervision, and is performed automatically within a range that does not hinder the user's viewing by judging the priority of information. By using the emergency broadcast information that has been acquired, it is not possible to acquire emergency broadcast information during multi-screen display, for example, if the user is watching a channel that does not send out emergency broadcasts, because the recording is scheduled It is possible to present the emergency broadcast text supervision while viewing any video as in the case where it is not possible to switch to the channel that is transmitting the emergency broadcast, and to improve the visibility.

  Thirdly, means for acquiring emergency broadcast information and displaying a character superimposition on an image receiving screen and means for receiving data superimposed on an out-of-band signal were developed for a set-top box (STB). It is possible to have the same configuration as the chip system LSI, and the multi-screen display means and the resolution conversion means for each screen can have the same configuration as the image processing of a general television receiver. Can be realized by adding a program of a microprocessor for controlling each means, so that the cost of a television receiver with a built-in digital tuner can be reduced.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to Embodiment 1 of the present invention. The digital broadcast receiving apparatus in FIG. 1 is a digital cable television broadcast receiving apparatus, and is an EIA / CE-EIA-CE-AIA-CEA-CEA-CE8-CE8-CE8-CE1-EIA14-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8-CE8ECE14 Receive emergency broadcasts in compliance with Industries Alliance CEA (Consumer Electronics Association).

  In FIG. 1, an RF signal including a digital broadcast wave is a signal transmitted from Head End which is a transmission terminal of a cable television station, and is input to the tuner unit 101. The tuner unit 101 demodulates the digital broadcast wave at a selected frequency, and takes out a TS in which a video signal, an audio signal, and data broadcast content are multiplexed.

  The demultiplexing unit 102 separates the TS into MPEG-2 video, audio, and data content streams.

  The AV decoding unit 103 is actually formed by a video decoding unit and an audio decoding unit, decodes selected video and audio streams, and outputs a video signal and an audio signal, respectively.

  The data decoding unit 104 decodes the selected data content stream and outputs the data content. Which video, audio, and data are to be decoded has a packet ID (PID) corresponding to a predetermined channel from PSI (Program Specific Information) composed of PAT / PMT (Program Association Table / Program Map Table) included in TS Done by selecting one.

  In cable digital broadcasting, emergency broadcast information such as superimpose, high priority and extraordinary detailed broadcast channel for emergency broadcasts must have a unique PID separately from video, audio, and normal data content with low priority. It is multiplexed in TS as a stream with it. Here, the tuner unit 101, the demultiplexing unit 102, the AV decoding unit 103, and the data decoding unit 104 constitute receiving means for receiving video, audio, and data. The emergency broadcast acquisition unit 105 is an emergency broadcast information acquisition unit that acquires emergency broadcast information that is more urgent or more important than the data received by the reception unit. If it is within the same TS as the video and audio being received, the PSI The emergency broadcast information can be extracted from the data decoding unit 104 by detecting the PID indicating the emergency broadcast.

  Of the extracted emergency broadcast information, the character super data is supplied to the character super generation unit 106, converted into OSD display data as a character string, and an OSD display unit (not shown) that also displays a GUI or the like performs OSD display. The superimposing unit 107 displays the character superimposition on the video signal output from the AV decoding unit 103. This video signal with the superimpose is supplied to the main video processing unit 108. Here, the character super generating unit 106 is a character super generating unit that generates a character super from emergency broadcast information, and the OSD superimposing unit 107 is a superimposing unit that displays the character superimposition on the received video. If these are displayed exclusively with other OSDs according to the priority order included in the emergency broadcast information, they can be shared with means for displaying normal data content with low priority such as subtitles and subtitles.

  The SW 112 selects the video signal input from the external input terminal 114 and outputs it to the A / D conversion unit 113. The video converted into the digital signal is supplied to the sub video processing unit 109.

  The main video processing unit 108 and the sub video processing unit 109 have functions of an IP (Interlace-Progressive) conversion process and a resolution conversion process for converting an interlace scan into a progressive scan, and are held in a frame memory (not shown). By performing these arithmetic processes on the video data, it is possible to eliminate flickering of the video and arbitrarily change the aspect ratio or scale ratio of the main and sub screens. The video composition unit 110 synthesizes and displays the processed main and sub videos on a multi-screen. The display position of the main / sub input video is normally such that the main video is displayed on the left side of the screen and the sub video is displayed on the right side, but the video composition unit 110 has a main / sub switching function for switching the display position of the main / sub video. Yes. Here, the main video processing unit 108 and the sub video processing unit 109 are resolution conversion means for arbitrarily changing the aspect ratio or scale ratio of each screen displayed on a multi-screen, and the video composition unit 110 is input from an external device. This corresponds to video synthesizing means for displaying the received video in a multi-screen on the same screen.

  The monitor unit 111 is a display device such as a plasma display or a liquid crystal display, and displays the multi-screen synthesized digital broadcast reception video with superimposed characters and the external input video on the same screen.

  The operation unit 115 gives an instruction to a user operation input from a remote controller or a keyboard to each unit, and the screen control unit 116 includes a microprocessor and a memory, and the main video processing unit 108 and the sub video unit 108 according to the user operation received from the operation unit 115. By controlling the video processing unit 109 and the video composition unit 110, the aspect ratio or scale ratio of the main and sub screens is changed. Furthermore, the screen control unit 116 is configured to refer to information from the emergency broadcast information acquisition unit 105, and determines the presence / absence and priority of character super display at the time of emergency broadcast, giving priority to user operations. In this case, the aspect ratio or scale ratio of the main / sub-screen is automatically changed based on this information. Here, the screen control unit 116 is a control unit that can change the aspect ratio or the scale ratio of the video displayed on the multi-screen based on the emergency broadcast information.

  FIG. 2 is a diagram showing an example of a display screen on the monitor unit 111 in the first embodiment of the present invention. When a user views a movie on an externally input video, for example, on a DVD, when the user operates the remote controller or the like to execute multi-screen display, the screen control unit 116 receives an instruction from the operation unit 115 and the main video processing unit 108 An image with a horizontal display size of 1/4 of the entire screen and an aspect ratio of 4: 3 is displayed on the sub-picture processing unit 109, and an image of the same display size of 3/4 of the entire screen and an aspect ratio of 16: 9 is displayed. Give instructions.

  Also, the video composition unit 110 is instructed to display, for example, the main video on the right side (subscreen) of the screen and the subvideo on the left side (main screen) of the screen. The tuner unit 101 selects a digital broadcast channel that was viewed immediately before, for example, a sports broadcast broadcast.

  As a result, a DVD image with a horizontal display size of 3/4 of the entire screen and an aspect ratio of 16: 9 is displayed on the left side (main screen) of the monitor unit 111, and a horizontal display size is displayed on the right side (subscreen). Is 1/4 of the entire screen and a digital broadcast image with an aspect ratio of 4: 3 is displayed.

  Here, the emergency broadcast transmission is started on the TS that is transmitting the channel of the digital broadcast being viewed, the emergency broadcast information acquisition unit 105 detects the presence or absence of the emergency broadcast information, and the character supermarket related to the emergency broadcast is displayed. If it exists, the character super generation unit 106 generates a character string for OSD display, and the received video with the superimpose character from the OSD superimposing unit 107 is processed by the main video processing unit 108 and the video synthesis unit 110. After being output. At that time, the monitor unit 111 is as shown in FIG.

  In the digital broadcast receiving apparatus constituted by the prior art, the screen state is the same as that in FIG. 2A, and the character super is small and difficult to see. Therefore, for example, the screen control unit 116 controls the main video processing unit 108 by performing a display size or aspect ratio control process based on the emergency broadcast information, which is a characteristic part of the digital receiver of the present invention. Instructs the sub-picture processing unit 109 to display a video with an aspect ratio of 4: 3 and a display size of 1/4 of the entire screen and an aspect ratio of 16: 9. Put out. In addition, the video composition unit 110 is instructed to display the main video on the right side of the screen (subscreen) and the subvideo on the left side of the screen (main screen). As a result, the received video with the superimpose is enlarged and displayed on the screen of the monitor unit 111, which greatly improves the visibility. At that time, the monitor unit 111 is as shown in FIG.

  Next, a screen display size or aspect ratio control process based on emergency broadcast information will be described. FIG. 3 shows an example of PSI data received by the digital broadcast receiving apparatus according to the present invention. In Band indicates a frequency of a transmission band of 6 MHz allocated to each physical channel of digital cable television broadcasting, and represents data multiplexed in the MPEG-2 TS together with video and audio. OOB (out-of-band) represents data multiplexed exclusively at frequencies outside the transmission band of all physical channels. The OOB data is not used in the first embodiment of the present invention because it does not have a receiving means and an acquiring means, and is used in a digital broadcast receiving apparatus according to a third embodiment of the present invention to be described later. In FIG. 3, assuming that two channels are operated on the same TS, video 1 is PID = 0x0010, audio 1 is PID = 0x0011, video 2 is PID = 0x0020, audio 2 is PID = 0x0021, and emergency broadcasting The data stream is defined with a unique value such that In Band is PID = 0x1FFB and OOB is PID = 0x1FFC.

  Here, in FIG. 1, when the demultiplexing unit 102 detects PID = 0x1FFB from the PSI and outputs a data packet including emergency broadcast information to the data decoding unit 104, the data decoding unit 104 converts the data of emergency broadcast information of In Band. Accumulate and decode sequentially. The emergency broadcast information acquisition unit 105 acquires the emergency broadcast information table shown in FIG. 4 from the data decoded by the data decoding unit 104.

  The emergency broadcast information table of FIG. 4 includes sequence number, priority, message text, and remaining message time as information related to emergency broadcast. The sequence number determines the display order of the urgent messages that are generated, and is assigned by the broadcasting station in the order of generation. The priority is a value from 0 to 15, and the higher the numerical value, the more important or urgent information is received. The message text is character string data for displaying a character super. The remaining message time indicates how many seconds the emergency message currently being received is valid. This priority is not used in the determination of the screen control unit 116 in the first embodiment of the present invention, but is used in the digital broadcast receiving apparatus according to the second embodiment of the present invention described later.

  In FIG. 1, the screen control unit 116 refers to the emergency broadcast information table shown in FIG. 4 acquired by the emergency broadcast information acquisition unit 105. If it is determined that a new message has been received from the sequence number, the message text acquired by the character super generation unit 106 is converted into OSD display data, and the OSD superimposing unit 107 performs processing of scrolling and redrawing in the horizontal direction. Output sequentially. At the same time, the screen control unit 116 provides the main video processing unit 108 with a display size 3/4 of the entire screen and an aspect ratio of 16: 9, and the sub video processing unit 109 has a display size 1 / of the entire screen. 4 is instructed to display an image with an aspect ratio of 4: 3. In addition, the video composition unit 110 is instructed to display the main video on the right side of the screen (subscreen) and the subvideo on the left side of the screen (main screen). As a result, the character superimposition as an emergency message is displayed on the screen of the monitor unit 111 while being scrolled in the horizontal direction so as to overlap the broadcast video being received, and the image with the character superimposition is displayed on the screen in an enlarged manner. As shown in FIG. 2B, the user can surely see the emergency information.

  When it is determined that the remaining time has run out with reference to the remaining message time, the screen control unit 116 issues an instruction to stop generating the message text to the character super generation unit 106 via the emergency broadcast information acquisition unit 105, and The video processing unit 108 and the sub video processing unit 109 are instructed to return the display size to the state before the emergency message display. As a result, the display of the superimpose message, which is an emergency message, disappears from the screen of the monitor unit 111, and the display size and aspect ratio of the main / sub video displayed on the multi-screen are automatically restored to the original ones in FIG. The user mainly watches a DVD movie.

  As described above, according to the configuration of the present invention, it is shown that the first effect of the present invention, which is easy to see the text superimpose of emergency broadcast during multi-screen display, can be realized.

  In the present embodiment, the screen display on the monitor unit 111 shows a case of performing PoutP (picture-out-of-picture) display in which the screens of the digital broadcast image and the external input video are arranged on the right side and the left side, respectively. However, even when other multi-screen display such as PinP (picture-in-picture) is performed, the application of the present invention is not hindered.

  In FIG. 1, each component of the demultiplexing unit 102, the AV decoding unit 103, the data decoding unit 104, the emergency broadcast information acquisition unit 105, the character super generation unit 106, and the OSD superimposition unit 107 is on the same module as the system LSI 117. Shown as implemented. It is possible to design a one-chip system LSI developed for a set top box (STB) that does not have a video composition unit, a monitor unit, or a screen control unit to be used for a digital tuner unit of a television receiver. Similarly, the main video processing unit 108, the sub video processing unit 109, the video synthesis unit 110, and the screen control unit 116 are shown to be implemented with the same configuration as a television receiver having a general multi-screen display function. ing. According to the configuration of the present invention, these controls can be realized by adding a program of the microprocessor of the screen control unit 116. Therefore, a digital tuner, which is the third effect of the present invention, is incorporated. This shows that it is feasible to reduce the cost of a television receiver.

(Embodiment 2)
Since the configuration of the digital broadcast receiving apparatus according to Embodiment 2 of the present invention is the same as that in FIG. 1, the description of the same components in the block diagram is omitted. As described above, when the emergency broadcast information acquisition unit 105 acquires the emergency broadcast information table shown in FIG. 4, the difference from the digital broadcast receiving apparatus according to the first embodiment of the present invention is that of the emergency broadcast information included therein. The point is that control is performed in consideration of priority. When it is determined that the acquired emergency message is a low priority message that does not need to interfere with the user's viewing, the screen control unit 116 sends the message text to the character super generation unit 106 via the emergency broadcast information acquisition unit 105. Do not generate. In this case, the main video processing unit 108 and the sub video processing unit 109 are not instructed. Alternatively, if there is a character supermarket related to the emergency broadcast currently being displayed, an instruction to stop the superimpose is issued. The main video processing unit 108 and the sub video processing unit 109 are instructed to maintain the display size in the state before the emergency message display, that is, the display size in FIG.

  This is the case when a user is selecting a channel for viewing or recording a program contracted with a cable company by pay-per-view (PPV) or conditional access (CA).

  Although it is the same effect as Embodiment 1 of this invention, since it can mount in the form which does not prevent the viewing form which the user prescribed | regulated by a broadcast operation standard should give priority, it can be said that it is the form which improved practicality more.

(Embodiment 3)
FIG. 5 shows the configuration of the digital broadcast receiving apparatus according to Embodiment 3 of the present invention. The same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. The difference from FIG. 1 is that it has an independent second tuner section and decoding section to obtain OOB data.

  Here, the OOB tuner unit 118 and the OOB decoding unit 119 constitute second receiving means for receiving data superimposed on an out-of-band signal of a digital broadcast wave. Although the component corresponding to the second emergency broadcast information acquisition means is not shown here, the emergency broadcast information table of FIG. 4 is defined in the EIA / CEA-814 standard so that the same transmission format is used for In Band and OOB. Therefore, the emergency information broadcast acquisition unit 105 reads the data storage buffer (not shown) of the data decoding unit 104 and the OOB data decoding unit 119 sequentially and performs processing, so that the emergency information broadcast acquisition unit 105 performs the In Band and the OOB. It shall be compatible with both.

  As described above, the OOB data is multiplexed with the RF signal received from the head end at a predetermined frequency outside the transmission band, and the digital broadcast receiving apparatus uses the OOB tuner unit 118 to tune the tuner unit 101 as the first receiving means. Regardless of which channel is selected, it is possible to always receive OOB data.

  Since the operation of changing the aspect ratio and scale ratio of the multi-screen display based on the information acquired by the emergency information broadcast acquisition unit 105 is the same as in the first and second embodiments of the present invention described above, Description is omitted.

  As described above, according to the present configuration, the second effect of the present invention is that emergency broadcast information cannot be acquired during multi-screen display, for example, a user is viewing a channel that is not transmitting emergency broadcasts. In such a case, it is possible to switch to the channel that is sending out the emergency broadcast because the recording is reserved, so that the emergency broadcast text superimposition can be presented and the readability can be improved while watching any video. Can do.

  Next, an operation flow of the digital broadcast receiving apparatus configured as described above will be described. 6 to 7 are diagrams showing an operation flow of the digital broadcast receiving apparatus shown in FIGS. First, the operation flow of FIG. 6 will be described.

  FIG. 6 is a diagram showing an operation flow when the emergency broadcast information is received during the multi-screen display including the digital broadcast in the digital broadcast receiving apparatus according to the first to third embodiments of the present invention. Here, in order to focus on the description of the operation relating to the change of the aspect ratio or scale ratio according to the emergency broadcast information, which is a feature of the present invention, the operation flow processed by the screen control unit 116 is used and related. A part of the operation of another control unit (not shown) will be supplementarily described.

  First, as a precondition, the operation unit 115 is operated by a user's operation of a remote controller or the like, and the screen control unit 116 recognizes that the operation is for performing multi-screen display on the monitor unit 111, and the main video processing unit 108. In addition, the main screen aspect ratio is 16: 9, the horizontal scale ratio is 3/4 of the entire screen, and the sub screen aspect ratio is 4: 3. It is assumed that the control is performed so that the directional scale ratio is 1/4 PoutP screen (the same screen layout as that in FIG. 2A excluding the character superposition) of the entire screen.

  When the emergency broadcast is received, the emergency broadcast information acquisition unit 105 acquires the emergency broadcast information and updates the emergency broadcast information table of FIG. The screen control unit 116 receives the update notification of the emergency broadcast information table and starts processing (step S1), and reads information necessary for screen state control from the emergency broadcast information table. First, the sequence number is referred to (step S2), and it is determined whether there is a new message related to emergency broadcasting by detecting a change in the sequence number (step S3). If there is a new message, it is set by a user operation. The screen state (the aspect and the scale ratio of each of the main and sub screens) is held on the RAM (step S4). Next, as shown in FIG. 2A, the aspect and scale ratio are calculated so that the display size of the screen on which the message is displayed (here, the main video and the sub screen) is maximized, and the main video processing unit 108, the sub video processing unit 109, and the video synthesizing unit 110 are set with parameters such that the aspect ratio of the sub screen as the main video is 16: 9 and the horizontal scale ratio is the same as that of the entire screen as shown in FIG. The aspect ratio of the main screen, which is 3/4, the sub-picture is 4: 3, and the horizontal scale ratio is 1/4 of the entire screen (step S5), and the process is terminated (step S9).

  Alternatively, in step S3, when there is no new message, the message remaining time is referred to for the message of the sequence number currently displayed (step S6). The remaining message time referred to here is used to determine how many seconds the currently displayed message is valid, and the character super generating unit 106 separately uses the time specified in the emergency broadcast information table as an initial value. This is the value managed by Until this remaining time reaches 0 seconds, the character super generation unit 106 scrolls and displays the message on the screen, and at the same time, the screen control unit 116 maintains the current screen state. At the same time, the display of the message is interrupted, and the screen control unit 116 reduces the aspect and scale ratio held in step S4 (here, the scale is the aspect 16: 9 of the sub-screen which is the main video as shown in FIG. 2A). Parameters are set for each part of the main video processing unit 108, the sub video processing unit 109, and the video composition unit 110 so that the ratio is 3/4, the aspect ratio 4: 3 of the main screen, which is the sub video, and the scale ratio 1/4. Step S8), the process ends (step S9).

  The screen control unit 116 executes the flow of FIG. 6 only when notification from the emergency broadcast information acquisition unit is received by an event in accordance with the broadcast PSI, such as interruption of emergency broadcast or channel selection on another TS. Alternatively, it is also performed when a screen state switching request is received by a user operation on the operation unit 115. For example, when the user selects another digital broadcast channel and emergency broadcast information is not sent on the TS, or when the external input is being viewed on both the main and sub screens, no digital broadcast channel is selected. This is the case. Also in this case, the processing from step S6 to step S8 is executed, and when the remaining message time becomes 0 second, the screen state is returned to the state held in step S4.

  Through the above processing, in the present embodiment, when tuner 101 receives an emergency broadcast in a viewing state of multi-screen display including a digital broadcast, screen control unit 116 determines that there is a new message related to the emergency broadcast. By calculating the aspect and scale ratio and setting parameters for each of the main video processing unit 108, the sub video processing unit 109, and the video synthesis unit 110, the superimpose as an emergency broadcast message is automatically displayed on the monitor unit 111. It can be enlarged.

  In addition, when the message display ends or emergency broadcast information is no longer acquired due to tuning to another channel or external input, the screen is automatically displayed with the aspect and scale ratio set by the user operation immediately before. The state can be restored and the enlarged display can be canceled.

  As a result, when the superimpose at the time of emergency broadcast reception is reduced during multi-screen display, the aspect ratio or scale ratio of the screen is automatically expanded to improve the visibility of the superimpose of emergency broadcast It is possible to reliably provide important emergency information to the user.

  Next, the operation flow of FIG. 7 will be described. FIG. 7 is a diagram showing an operation flow when the emergency broadcast information is received during the multi-screen display including the digital broadcast in the digital broadcast receiving apparatus according to the second to third embodiments of the present invention. The difference from the operation flow of FIG. 6 is that processing when a new message exists in step S3 is added, the priority of the emergency message is further referred from the emergency broadcast information table (step S10), and the acquired message is changed by the user. It is determined whether there is urgency or importance enough to forcibly change the screen state set immediately before, that is, whether the priority is high (step S11), and if it is high, the process proceeds to step S4.

  Alternatively, if there is no urgency or importance enough to forcibly change the screen state, that is, the priority is not high, the process proceeds to step S8.

  In addition, it is defined in advance in the broadcast operation rule that the priority is transmitted between 0 and 15, for example, when priority = 11, a message is displayed regardless of the viewing state of the user. . Incidentally, the test radio wave has a priority = 0, 3 when viewing CA (Conditional Access), and 7 when viewing PPV. Therefore, the conditional expression in step S11 may be priority> 10. This is because CA and PPV are not so related to the operation of the screen control unit, and conversely, message display may be suppressed in these viewing states, so that the screen state is inadvertently changed. Without disturbing the user's viewing.

  With the above processing, in the present embodiment, when the tuner unit 101 receives an emergency broadcast in a viewing state of multi-screen display including a digital broadcast, the priority is high when a new message related to the emergency broadcast exists. If the message priority is high, the screen control unit 116 calculates the aspect and scale ratio and sets parameters for each of the main video processing unit 108, the sub video processing unit 109, and the video synthesis unit 110. On the monitor unit 111, it is possible to automatically enlarge and display a character supermarket which is an emergency broadcast message.

  As a result, when the superimpose at the time of emergency broadcast reception is reduced during multi-screen display, the aspect ratio or scale ratio of the screen is automatically expanded to improve the visibility of the superimpose of emergency broadcast It is possible to reliably provide important emergency information to the user, and to provide a suitable viewing environment that does not disturb the user's viewing more than necessary by judging the urgency and importance of the information. .

  Finally, in the digital broadcast receiving apparatus shown in FIG. 5, since the operation viewed from the screen control unit 116 is the same as that in FIG. 1, the operation flow is omitted, but the signal from the cable head end is always supplied to the OOB tuner unit 118. Thus, the emergency broadcast information acquisition unit 105 can always acquire emergency information through the OOB decoding unit 119.

  As a result, in addition to the effects expected by the digital broadcast receiving apparatus shown in FIG. 1, recording reservation is being made when emergency broadcast information cannot be acquired, for example, when a user is viewing a channel that does not send out emergency broadcasts. Therefore, when switching to a channel that is sending out emergency broadcasts is not possible, it is effective even when viewing only external inputs, so it is more important to improve the visibility of emergency broadcast text supermarkets more reliably. Emergency information can be provided to the user.

  The digital broadcast receiving apparatus according to the present invention improves the visibility of emergency broadcast text supervision by automatically enlarging the screen when receiving an emergency broadcast even in a multi-screen display state, which hinders the viewing of the user. It is possible to improve the ease of viewing and display the emergency broadcast text supervision while viewing any video, and to achieve these effects by adding programs to achieve cost reduction Therefore, it is useful as a digital broadcast receiver that displays video and text information related to emergency broadcasts, particularly as a television receiver.

Block diagram of a digital broadcast receiving apparatus according to Embodiments 1 and 2 of the present invention It is a figure which shows an example of the display screen in the digital broadcast receiver in Embodiment 1-3 of this invention, (a) The figure at the time of operation | movement within the range of a prior art, (b) Character superimposition of emergency broadcasting Figure when the main video where there was The figure which shows the example of the PSI data which the digital broadcast receiver in Embodiment 1-3 of this invention receives The figure which shows the example of the emergency broadcast information table which the digital broadcast receiver in Embodiment 1-3 of this invention manages internally. Block diagram of a digital broadcast receiving apparatus in Embodiment 3 of the present invention The figure which shows the operation | movement flow at the time of receiving an emergency message during multiscreen display in the digital broadcast receiver in Embodiment 1 thru | or 3 of this invention. The figure which shows the operation | movement flow at the time of receiving an emergency message in the multi-screen display in the digital broadcast receiver in Embodiment 2 and 3 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Tuner part 102 Demultiplexing part 103 AV decoding part 104 Data decoding part 105 Emergency broadcast information acquisition part 106 Character super generation part 107 OSD superimposition part 108 Main video processing part 109 Sub video processing part 110 Video composition part 111 Monitor part 112 SW
113 A / D Conversion Unit 114 External Input Terminal 115 Operation Unit 116 Screen Control Unit 117 System LSI
118 OOB tuner section 119 OOB decode section

Claims (4)

Receiving means for receiving video, audio, and data; emergency broadcast information acquiring means for acquiring emergency broadcast information having higher urgency or importance than the data; and character super generating means for generating a character super from the emergency broadcast information; Superimposing means for superimposing and displaying the character superimposition on the received video; video composition means for displaying the received video on the same screen as video input from an external device; and each screen displayed on the multi-screen Digital broadcast reception comprising: resolution conversion means for arbitrarily changing the aspect ratio or scale ratio of the image; and control means for changing the aspect ratio or scale ratio of the video displayed on the multi-screen based on the emergency broadcast information apparatus. 2. The digital according to claim 1, wherein the control means is configured to be able to change an aspect ratio or a scale ratio of the video displayed on the multi-screen on the basis of information on a high degree of urgency included in the emergency broadcast information. Broadcast receiving device. Second receiving means for receiving data superimposed on an out-of-band signal of a digital broadcast wave; and second emergency broadcast information acquiring means for acquiring emergency broadcast information with higher urgency or importance than the second receiving means; The digital broadcast receiver according to claim 1, further comprising: the control unit configured to control a channel related to the emergency broadcast information regardless of whether or not the image is being received. In the control method of the digital broadcast receiving apparatus, the received emergency broadcast information is displayed as a character superimposition on the image receiving screen and displayed on the same screen together with the video input from the external device. The emergency method information is at least identified. Control for changing the aspect ratio or scale ratio of the video displayed on the multi-screen in the previous period by performing determination processing based on the identification number, priority, and remaining time. A method for controlling a digital broadcast receiver characterized by

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