JP2009171393A - Broadcast receiver, broadcast receiving method and broadcast receiving program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a broadcast receiver capable of easily specifying a speaker of a speaking content shown by closed caption information. <P>SOLUTION: When strong hierarchy is selected as an output video image upon determination through a simultaneous broadcasting determination unit 10 that both strong hierarchy and weak hierarchy are simultaneous broadcasts as the result of decoding a broadcasting signal through a decoder unit 5 received and modulated so as to be the strong hierarchy and the weak hierarchy through a tuner unit 1 and an OFDM modulating unit 2, the closed caption information of the weak hierarchy which is broadcasted simultaneously is converted into edited closed caption information to display by a closed caption display position operating unit 11 as for the strong hierarchy and displayed by synchronizing with the video information of the strong hierarchy through a delay circuit control unit 12 instead of the closed caption information of the selected strong hierarchy. The closed caption display position operating unit 11 converts the display position of the closed caption information of the weak hierarchy, a display region and the closed caption control information which comprises at least the display position of closed caption of the weak hierarchy, a display region and a letter size into the edited closed caption control information for the strong hierarchy by the video format information of the strong hierarchy and the video format information of the weak hierarchy whereby the edited closed caption information is generated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a broadcast receiver, a broadcast reception method, and a broadcast reception program, and more particularly to a broadcast receiver, a broadcast reception method, and a broadcast reception program that receive a plurality of digital broadcast signals.

  ISDB-T (Integrated Services Digital Broadcasting for Terrestrial) system has been established as a technical standard for terrestrial digital broadcasting in Japan. The biggest feature of the ISDB-T system is that the transmission band is divided into 13 segments, The modulation scheme is changed in segment units, and a modulation scheme of a maximum of three layers can be transmitted simultaneously. For example, in the case of transmission in two layers, 12 segments out of 13 segments are used to provide high definition broadcasting (HDTV: High Definition Television) for fixed broadcast receivers, and at the same time, using one segment, Simple broadcasting for mobile terminals can be provided.

  For fixed broadcast receivers, not only content information (video, audio, subtitles, etc.) for horizontally large screens of 1920 x 1080 dots, but also abundant and detailed attached information (control) such as content output format and program related information Broadcast information to which (information) is added is transmitted as a modulation scheme for receiving a fixed broadcast, that is, a weak hierarchy. On the other hand, in the case of a portable terminal, in order to perform simple video transmission, 320 × 240 dot small screen content information (video, audio, subtitles, etc.) and a small amount of attached information (control information) are transferred to noise or multipath. It is transmitted as a strong modulation scheme, that is, a strong hierarchy. In some cases, the term “subtitle control code” is used as subtitle control information (information such as line feed of display characters, screen erasure, and character color instruction).

  A conventional broadcast receiver for receiving terrestrial digital broadcasting has a configuration as shown in FIG. 6 as described in Japanese Patent Application Laid-Open No. 2004-186882 “Terrestrial Digital Receiver”. FIG. 6 is a block configuration diagram showing a block configuration of a conventional broadcast receiver. The conventional broadcast receiver shown in FIG. 6 includes a tuner unit 21, an OFDM demodulator unit 22, a DEMUX unit 23, a CPU 24, a decoder unit 25, a D / A unit 26, an OSD unit 27, an audio output unit 28, and a video output unit. 29.

  The tuner unit 21 extracts broadcast radio waves of a designated channel from broadcast radio waves received by an antenna. The tuner unit 21 can designate a hierarchy to be received, and can extract only 12 segments in a weak hierarchy, Only one segment of the hierarchy can be extracted, or both the 12 segments of the weak hierarchy and the 1 segment of the strong hierarchy can be extracted simultaneously. The OFDM demodulator 22 demodulates an OFDM (Orthogonal Frequency Division Multiplexing) type signal in a form corresponding to a strong layer and a weak layer modulation method. The DEMUX unit 23 separates strong layer and weak layer video information, audio information, caption information, auxiliary information (control information) and the like multiplexed in the demodulated broadcast signal. The decoder unit 25 decodes the video information, audio information, caption information, attached information (control information), etc., of the strong layer and weak layer separated by the DEMUX unit 23, and the decoded caption information and attached information (control information) are Transfer to CPU 24.

  The CPU 24 operates according to program logic, receives subtitle information and attached information (control information), edits various information to be output, and controls the operation of each circuit block of the broadcast receiver. The D / A unit 26 converts the audio information decoded by the decoder unit 25 into an analog signal. The OSD unit 27 synthesizes the graphic information and subtitle information editing result from the CPU 24 on the video information and edits it into a composite video information format that can be displayed on the OSD (On Screen Display). The audio output unit 28 outputs the audio information from the D / A unit 26 from a speaker or the like. The video output unit 29 displays the composite video information from the OSD unit 27 on the monitor screen.

As is clear from the description of each circuit block described above, the broadcast receiver having the block configuration of FIG. 6 designates the broadcast signal transmitted from the designated layer by designating the received layer among the broadcast signals of each layer. And the video information, audio information, and subtitle information included in the broadcast signal are output from a monitor screen or a speaker. In the case of the portable terminal, as described above, a strong hierarchy broadcast signal is received as one segment broadcast.
JP 2004-186882 A (pages 5-7)

  Conventional broadcast receivers used for mobile terminals and the like receive broadcast signals (video information, audio information) broadcast on a strong hierarchy conforming to the ISDB-T system when receiving a broadcast signal of a strong hierarchy and displaying the screen. , Subtitle information and attached information (control information)) are used as they are and displayed on the screen as described above.

  However, in the ISDB-T system, the information for designating the display position and display area to be displayed on the monitor screen is not included as the control information for controlling the output format of the caption information of the strong hierarchy. The specification is such that caption information is displayed at a predetermined position. For this reason, for example, when a video in which a plurality of people are talking is displayed on the monitor screen, it is easy to understand which person is talking about the conversation information displayed as subtitle information. There are cases where it is impossible.

  For example, in the case of the monitor screen shown in FIG. 7, an image in which two persons are talking is displayed, and a specific position for displaying subtitle information is displayed on the lower left side of the monitor screen, for example, “Nice to meet you”. Is displayed. However, the conversation content of the subtitle “Nice to meet you” cannot easily grasp which of the two people is speaking. After that, even if the subtitle information “Welcome” as shown in FIG. 8 is displayed on the lower left of the monitor screen as a screen after a certain time has elapsed since the screen of FIG. 7 is displayed, Similarly, it cannot be easily understood which of the two people is speaking. 7 and 8 are explanatory diagrams for explaining the problem of the conventional broadcast receiver, and show a display example of the conventional monitor screen of the caption information of the strong hierarchy.

  The present invention has been made to solve such a problem, and in a digital broadcast, a broadcast receiver, a broadcast reception method, and a broadcast reception program capable of easily identifying a speaker having a speech content indicated by caption information. The purpose is to provide.

  In order to solve the above-described problems, the broadcast receiver, the broadcast reception method, and the broadcast reception program according to the present invention employ the following characteristic configuration.

(1) In a broadcast receiver that receives a broadcast signal, when the content of the first broadcast program is the same as the content of the second broadcast program, the subtitle information of the second broadcast program is changed to the first broadcast program. A broadcast receiver that displays in place of subtitle information of a broadcast program.
(2) The second broadcast program based on the video format information of the second broadcast program when displaying the subtitle information of the second broadcast program instead of the subtitle information of the first broadcast program The subtitle control information including at least the display position, display area, and character size of the subtitle information is converted as the subtitle control information of the first broadcast program based on the first broadcast program video format information. Broadcast receiver.
(3) When the character size of the subtitle information calculated as the subtitle control information is smaller than a predetermined character size threshold, the number of subtitle information until the character size exceeds the character size threshold The broadcast receiver according to (2), which is generated by being divided into subtitle information.
(4) When the reception status of a received broadcast deteriorates to a predetermined condition or less, when automatically switching to a broadcast with a higher reception sensitivity that is being simulcast, Check whether the subtitle information and subtitle control information related to the subtitle information can be correctly decoded. If the subtitle information can be decoded, the subtitle information is edited based on the received subtitle information of the broadcast. Then, the broadcast receiver according to any one of the above (1) to (3), which displays on the video information of the broadcast with stronger reception sensitivity instead of the caption information of the broadcast with stronger reception sensitivity.
(5) A broadcast receiving method for receiving a broadcast signal, wherein when the content of the first broadcast program is the same as the content of the second broadcast program, the caption information of the second broadcast program is A broadcast receiving method for displaying instead of subtitle information of one broadcast program.
(6) A broadcast receiving program in which the broadcast receiving method of (5) is implemented as a program that can be executed by a computer.

  According to the broadcast receiver, the broadcast reception method, and the broadcast reception program of the present invention, the following effects can be obtained.

  The first effect is that even when a broadcast signal (first broadcast signal), for example, a strong hierarchy broadcast signal with a small amount of control information (attachment information) for controlling the display method is received and displayed, Subtitle information of the broadcast signal (second broadcast signal) of the layer having abundant control information (attached information), for example, subtitle information edited from the subtitle information of the weak layer is displayed on the video information of the high layer, for example, the strong layer Therefore, it is possible to display the subtitle information near the speaker who has spoken the content of the subtitle information, and easily identify which person's conversation content is displayed as the subtitle information. Is that you can.

  The second effect is that when the reception state of the designated channel has deteriorated below a predetermined threshold value, when automatically switching video information and audio information to a layer that is more resistant to noise, multipath, etc. than the current layer, For example, when automatically switching from a weak layer to a strong layer, it is confirmed that simulcasting of both layers of the channel, for example, the weak layer and the strong layer, is performed, and at the same time, subtitle information and attached information about subtitle information ( If the control information) can be decoded correctly, it is automatically edited based on the subtitle information of the current layer, eg, the weak layer, on the video information of the higher layer, eg, the strong layer, which is more resistant to noise. By automatically displaying the closed caption information, the conversation content of any person can be used as the caption information even if the video information is switched to a higher layer, for example, a higher layer. In that it can easily identify that or is displayed.

  Hereinafter, preferred embodiments of a broadcast receiver, a broadcast reception method, and a broadcast reception program according to the present invention will be described with reference to the accompanying drawings. In the following description, the broadcast receiver and the broadcast reception method according to the present invention will be described, but it goes without saying that the broadcast reception method may be implemented as a broadcast reception program executable by a computer. In the following description, a case of a broadcast receiver that receives digital broadcast signals of two layers, a strong layer and a weak layer, as the first broadcast signal and the second broadcast signal will be described as an example. The broadcast receiver according to the invention is not limited to only two layers, and any broadcast receiver can be used as long as it can receive digital broadcast signals of two or more layers.

(Configuration example of embodiment of the present invention)
FIG. 1 is a block diagram showing an example of a block configuration of a broadcast receiver according to the present invention, and shows a configuration example of a broadcast receiver that receives a broadcast signal of digital terrestrial broadcasting. The broadcast receiver shown in FIG. 1 is capable of easily specifying the display position and display area of the caption information included in the broadcast signal of the strong hierarchy and the speaker of the content of the caption information. Can be suitably applied to a one-segment broadcast receiver mounted on a portable terminal or the like.

  The broadcast receiver shown in FIG. 1 includes a tuner unit 1, an OFDM demodulator unit 2, a DEMUX unit 3, a CPU 4, a decoder unit 5, a D / A unit 6, an OSD unit 7, an audio output unit 8, a video output unit 9, and a simultaneous determination. Unit 10, subtitle display position calculation unit 11, and delay circuit control unit 12. Among the circuit blocks constituting the broadcast receiver of FIG. 1, each circuit block excluding the simul judgment unit 10, the caption display position calculation unit 11, and the delay circuit control unit 12, that is, the tuner unit 1, the OFDM demodulation unit 2, and the DEMUX For the unit 3, CPU 4, decoder unit 5, D / A unit 6, OSD unit 7, audio output unit 8, and video output unit 9, a tuner unit 21, an OFDM demodulating unit 22 in the conventional broadcast receiver shown in FIG. The DEMUX unit 23, CPU 24, decoder unit 25, D / A unit 26, OSD unit 27, audio output unit 28, and video output unit 29 each have the same functions.

  That is, the tuner unit 1 extracts broadcast radio waves of a designated channel from broadcast radio waves received by an antenna, can specify a layer to be received, and can extract only 12 segments in a weak hierarchy. Only one segment in the strong hierarchy can be extracted, or both the 12 segments in the weak hierarchy and one segment in the strong hierarchy can be extracted simultaneously. Alternatively, any of the 12 segments separated for high definition broadcasting (HDTV: High Definition Television) and 3 segments for standard broadcasting (SDTV: Standard Definition Television) may be extracted for the middle layer. it can. In the present embodiment, a case is shown in which the tuner unit 1 is set in a state where both the 12 segments of the weak hierarchy and the 1 segment of the strong hierarchy are extracted simultaneously.

  The OFDM demodulating unit 2 demodulates an OFDM (Orthogonal Frequency Division Multiplexing) signal in a form corresponding to a modulation scheme of a strong layer and a weak layer. The DEMUX unit 3 separates strong layer and weak layer video information, audio information, caption information, auxiliary information (control information) and the like multiplexed in the demodulated broadcast signal. The decoder unit 5 decodes the video information, audio information, subtitle information, auxiliary information (control information), etc. of the strong layer and weak layer separated by the DEMUX unit 3, and the decoded subtitle information and auxiliary information (control information) are The data is transferred to the CPU 4 and the simul determination unit 10.

  The CPU 4 operates according to program logic, receives subtitle information and attached information (control information), edits various information to be output to the OSD unit 7 and the like, and controls the operation of each circuit block of the broadcast receiver. Is. The D / A unit 6 converts the audio information decoded by the decoder unit 5 into an analog signal. The OSD unit 7 synthesizes the graphic information and subtitle information editing results from the CPU 4 and the delay circuit control unit 12 on the video information and edits it into a composite video information format capable of OSD (On Screen Display) display. The audio output unit 8 outputs the audio information from the D / A unit 6 from a speaker or the like. The video output unit 9 displays the composite video information from the OSD unit 7 on the monitor screen.

  In the broadcast receiver of FIG. 1, a circuit block that is newly added as a circuit block that is not provided in the conventional broadcast receiver of FIG. 6, that is, a simul decision unit 10, a subtitle display position calculation unit 11, and The delay circuit control unit 12 is a circuit block having the following functions.

  The simul judgment unit 10 judges the presence / absence of simulcast based on the attached information (control information) from the decoder unit 5, and the received broadcast signal includes a 12 segment weak hierarchy broadcast signal and a 1 segment strong signal. It is determined whether the same broadcast content is received simultaneously with the broadcast signal of the hierarchy. Here, as for the technique for determining the presence / absence of simulcast, as in the prior art, for example, based on the electronic program guide information included in the received broadcast signal, at least one of the broadcast program name, broadcast genre, broadcast time zone, etc. You may make it judge using two or more.

  The caption display position calculation unit 11 is activated when the simul judgment unit 10 determines that the received broadcast signal of the weak layer and the strong layer is simulcast, and is attached to the weak layer received simultaneously. By referring to at least the display position, display area, and display character size of the caption information in the weak hierarchy included in the information (control information), the display position, display area, and display of the caption information on the video information in the strong hierarchy The character size and the like are calculated, and the subtitle information of the weak hierarchy converted to the calculated character size is edited as the edited subtitle information in the calculated display position and display area. As a result, it is possible to change the display position of the caption information that is combined and displayed on the video information of the strong hierarchy to the vicinity of the speaker of the speech content of the caption information.

  The delay circuit control unit 12 adjusts the timing at which the edited subtitle information calculated by the subtitle display position calculation unit 11 should be displayed to the display position of the subtitle information calculated by the subtitle display position calculation unit 11. Synchronize caption information and video information. Regarding the configuration of the delay circuit for adjusting the timing for displaying subtitle information regardless of whether it is edited, for example, a frame memory is used to control the timing for inputting / outputting subtitle information, video information, and audio information. It doesn't matter.

(Example of operation of the broadcast receiver in FIG. 1)
As described above, the broadcast receiver shown in FIG. 1 does not display the subtitle information of the strong hierarchy broadcast on the designated channel as it is at a specific position on the monitor screen determined in advance as the strong hierarchy, If a weak broadcast signal with abundant attached information (such as control information related to subtitle information) is received simultaneously as a simulcast, the display position, display area, etc. of the weak subtitle information can be changed. By referencing, the display position and display area of the caption information on the video information of the strong hierarchy is adjusted, and the edited caption information obtained by editing the caption information of the weak hierarchy is displayed instead of the caption information of the strong hierarchy. . Thus, when the message content is displayed as subtitle information, generally, the display format (display position, display area) equivalent to the case of a weak hierarchy in which the speaker of the message content can be easily identified. ), Subtitle information can be displayed on the video information of the strong hierarchy.

  A specific processing procedure will be described with reference to the flowchart of FIG. FIG. 2 is a flowchart for explaining an example of the operation of the broadcast receiver according to the present invention, and shows an example of a specific processing procedure relating to the caption display position adjustment process in the broadcast receiver of FIG.

  In the broadcast receiver shown in FIG. 1, the broadcast signal received by the tuner unit 1 is demodulated by the OFDM demodulation unit 2, and the DEMUX unit 3 performs video information, audio information, subtitle information, The attached information (control information) is separated and decoded by the decoder unit 5. Subtitle information of the strong layer and the weak layer decoded by the decoder unit 5, information on the video format of the video information, the output format of the audio information, the output format of the subtitle information, and the auxiliary information that constitutes the electronic program guide (control) Information) is transferred to the simul judgment unit 10 and the CPU 4. Here, the processing procedure for adjusting the display position, the display area, and the display character size of the caption information by focusing on the caption information will be described with reference to the flowchart of FIG.

  First, when the CPU 4 obtains the result of decoding the subtitle information of the weak hierarchy by the decoder unit 5 (step S1), the text (character string) of the subtitle information and the control information are temporarily stored (step S2). Thereafter, the CPU 4 acquires the video format information related to the video information of the weak hierarchy from the attached information (control information) transferred from the decoder unit 5 and temporarily stores it (step S3). Further, the subtitle information and video format information of the strong hierarchy decoded by the decoder unit 5 are acquired and temporarily stored (step S4). The subtitle attached information (control information) is a so-called “subtitle control code”, and is information including at least information such as a line feed of a display character, screen erasure, and character color instruction.

  Next, based on the determination result determined by the simultaneous determination unit 10 whether or not the strong broadcast and the weak broadcast are simultaneous broadcasts of the same broadcast program, the CPU 4 receives the simultaneous broadcast on the channel being received. Is determined (step S5). When the broadcast is not simulcast (NO in step S5), the subtitle information of the strong layer is directly synthesized by the OSD unit 7 at the position on the video information specified as the display position of the strong layer, and the video output unit 9 (step S11). As a result, it becomes the same as the prior art. For example, as shown in the conventional examples of FIGS. 7 and 8, the subtitle information is displayed near the lower side of the monitor screen, and conversation scenes of a plurality of persons are displayed as images. In such a case, it is not possible to easily grasp which person's conversation content is displayed in subtitles.

  On the other hand, if the channel being received is being simultaneously broadcast on the weak layer and the strong layer (YES in step S5), the subtitle display position calculation unit 11 performs control information, video format information, and strong layer on the subtitle information of the weak layer. Based on the video format information, the subtitle information display position, display size, text (character string) on the video information of the strong layer when the subtitle information of the weak layer is converted into the subtitle information for the strong layer as the edited subtitle information. Edit subtitle control information including at least the character size etc.) is calculated (step S6).

  That is, first, based on the weak-layer video format information once stored in step S3 and the strong-layer video format information temporarily stored in step S4, the ratio of the screen display sizes of the two is calculated. . For example, when the screen display size of the weak layer is 1,920 × 1,080 dots and the screen display size of the strong layer is 320 × 240 dots, the screen display size ratio between the weak layer and the strong layer is The horizontal direction is calculated as 6: 1 and the vertical direction as 4.5: 1.

  Next, in the subtitle display position calculation unit 11, the control information of the subtitle information of the weak hierarchy temporarily stored in step S 2, that is, the subtitle information, based on the calculated screen display size ratio between the weak hierarchy and the strong hierarchy. Are converted into edit display positions and edit display areas for subtitle information in the strong hierarchy, and edited as edit subtitle control information for the strong hierarchy.

  For example, when the display position of the subtitle information of the weak hierarchy is in the upper right direction with the coordinate position (1070, 30) on the screen of the weak hierarchy, and the display area has a size of 620 × 480, the above-described screen display size By performing proportional calculation based on the ratio of 6: 1 in the horizontal direction and 4.5: 1 in the vertical direction, the display position of the corresponding subtitle information in the strong hierarchy is (178, 7), and the display area is 103 × 107. It becomes. Further, according to the conversion ratio of the size of the display area of the caption information, the character size of the text (character string) information constituting the caption information of the weak hierarchy is similarly converted, and the text (character string) information for the strong hierarchy is converted. That is, the edited caption information is edited.

  Further, the subtitle display position calculation unit 11 compares the converted character size for the strong layer with the preset character size threshold for the text information edited for the strong layer, that is, the edited subtitle information (step S11). S7) If the converted character size for the strong hierarchy is smaller than the character size threshold (YES in step S7), it is difficult to visually recognize the text of the subtitle information text, and the text of the edited subtitle information Is re-edited so as to be divided and displayed in the number of subtitle information having a character size equal to or greater than the character size threshold (step S8).

  Here, the display time for displaying the text of each subtitle information obtained by dividing the edited subtitle information into a plurality of pieces is calculated based on the display time information included in the control information of the subtitle information in the weak hierarchy. For example, when the text of the subtitle information of the weak hierarchy is 10 characters “Aiue Okeki Keko”, and the display time information included in the control code of the subtitle information of the weak hierarchy is set to be displayed for 2 seconds In step S8, when subtitle information is divided into two five-character texts “Aiueo” and “Kakikukeko”, the display time of each text is 1 second.

  Thereafter, the edited subtitle control information and the edited subtitle information edited for the strong hierarchy are output to the OSD unit 7 at the delay circuit control unit 12 so as to be synchronized with the video information, that is, the video ES (Elementary Stream). Adjustment is performed (step S9). When the edited subtitle control information or the edited subtitle information is output from the delay circuit control unit 12 to the OSD unit 7, the edited subtitle information is displayed in the display position or display area on the video information of the strong hierarchy indicated by the edited subtitle control information. It is synthesized as caption information and output from the video output unit 9 (step S10).

  As a result, the caption information edited from the caption information of the weak hierarchy is displayed on the video information of the strong hierarchy in a state in which the timing with the video information is synchronized, and a plurality of persons When the conversation scene is displayed as video, the subtitle information is displayed near the speaker without being fixedly displayed at a specific position as in the prior art. It is possible to easily specify whether or not is displayed as subtitle information.

  For example, in the case of the monitor screen shown in FIG. 3, an image in which two people are talking is displayed, and the caption content is displayed, for example, “Nice to meet you.” Displayed in the lower left. Therefore, it is possible to easily grasp that the speaker of the content of the message “Nice to meet you” is the person on the left side of the screen. After that, the caption information “Welcome” as shown in FIG. 4 is displayed at the upper right of the screen near the speaker as a screen after a certain time has elapsed since the screen of FIG. 3 is displayed. It is possible to easily grasp which of the two people is speaking. FIG. 3 and FIG. 4 are explanatory diagrams for explaining an example of the operation of the broadcast receiver according to the present invention, and show a display example on the monitor screen of the strong layer subtitle information.

  As described above, the present embodiment is characterized in that the subtitle information is displayed by diverting subtitle information of a different layer having more detailed control information than the strong layer, such as a weak layer. When subtitle information is diverted and displayed, the subtitle information is diverted based on video format information of different layers, control information related to subtitle information, and video format information of the stratum. The display position, display area, and character size of subtitle information in the hierarchy are calculated and displayed as edited subtitle information.

(Other embodiments)
In a broadcast receiver that automatically switches between a weak layer and a strong layer depending on whether or not the reception state has deteriorated to a predetermined condition or less, for example, BER (Bit Error Rate), CN (Carrier to Noise) If the reception condition deteriorates, such as when the ratio (SN) (Signal to Noise Ratio) falls below a predetermined threshold, block noise will occur even if the video information of the weak layer is decoded. In many cases, it automatically switches to a strong hierarchy. As described above, since the reception state has deteriorated, it is possible to easily grasp the speaker of the content of the caption information in the conversation scene of a plurality of persons even when the weak layer is automatically switched to the strong layer. In addition, as described in the above-described embodiment, only subtitle information may be used for subtitle information in a weak hierarchy.

  A specific processing procedure in the case where such a broadcast signal reception state is considered is shown in the flowchart of FIG. FIG. 5 is a flowchart for explaining an example of the operation of the broadcast receiver according to the present invention, which is different from FIG. 2, and subtitle information is weakened when switching from a weak layer to a strong layer due to deterioration of the reception state. The operation example when editing and using the thing of a hierarchy is shown.

  In the flowchart of FIG. 5, first, it is determined whether or not the reception state of the broadcast signal has deteriorated below a predetermined threshold (step S21). If it is determined that the reception state has deteriorated below the threshold (YES in step S21), it is determined whether or not the weak layer and the strong layer of the specified channel are simultaneously broadcast using the simul determination unit 10. (Step S22). When the weak layer and the strong layer are simultaneously broadcasting (YES in step S22), it is further determined whether or not the caption information including the control information is normally received and decoded correctly. (Step S23). If it can be correctly decoded (YES in step S23), the process for adjusting at least the display position, display area, character size, etc. of the caption information is performed by the same process procedure as the flowchart of FIG. And processing for displaying the edited subtitle information edited from the subtitle information of the weak hierarchy in the adjusted display position and display area on the video information of the strong hierarchy (step S24).

  By performing the processing procedure like this, the reception status of the specified channel deteriorates below the predetermined condition, and the reception sensitivity is stronger than the weak hierarchy that has been selected so far for the selection of video information and audio information When automatically switching to the strong layer, it is confirmed that simulcasting between the weak layer and strong layer of the channel is being made, and at the same time, the subtitle information of the weak layer that has been selected so far and the attached information on the subtitle information ( If the control information is correctly decoded, the subtitle information edited based on the subtitle information of the weak layer is automatically displayed on the video information of the strong layer, so that the content of the remarks of the subtitle information It is possible to display caption information at a position where the speaker who is speaking can be easily grasped.

  In addition, when using the video information and audio information of the strong layer, the subtitle information of the weak layer is edited and displayed on the display position and display area of the subtitle information calculated by the subtitle display position calculation unit 11 Alternatively, the strong hierarchy subtitle information (text) itself may be edited and displayed.

  The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such examples are merely illustrative of the invention and do not limit the invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention.

It is a block block diagram which shows an example of the block configuration of the broadcast receiver by this invention. 5 is a flowchart for explaining an example of the operation of the broadcast receiver according to the present invention. It is explanatory drawing for demonstrating an example of operation | movement of the broadcast receiver by this invention. It is explanatory drawing for demonstrating an example of operation | movement of the broadcast receiver by this invention. It is a flowchart for demonstrating the example different from FIG. 2 of operation | movement of the broadcast receiver by this invention. It is a block block diagram which shows the block configuration of the conventional broadcast receiver. It is explanatory drawing for demonstrating the problem of the conventional broadcast receiver. It is explanatory drawing for demonstrating the problem of the conventional broadcast receiver.

Explanation of symbols

1 Tuner unit 2 OFDM demodulator unit 3 DEMUX unit 4 CPU
5 Decoder unit 6 D / A unit 7 OSD unit 8 Audio output unit 9 Video output unit 10 Simultaneous determination unit 11 Subtitle display position calculation unit 12 Delay circuit control unit 21 Tuner unit 22 OFDM demodulation unit 23 DEMUX unit 24 CPU
25 Decoder unit 26 D / A unit 27 OSD unit 28 Audio output unit 29 Video output unit

Claims (6)

  In a broadcast receiver that receives a broadcast signal, when the content of the first broadcast program is the same as the content of the second broadcast program, the subtitle information of the second broadcast program is used as the subtitle information of the first broadcast program. A broadcast receiver characterized by displaying in place of subtitle information.   When displaying the caption information of the second broadcast program instead of the caption information of the first broadcast program, the caption information of the second broadcast program based on the video format information of the second broadcast program 2. Subtitle control information including at least a display position, a display area, and a character size is converted as subtitle control information of the first broadcast program based on the first broadcast program video format information. Broadcast receiver described in 1.   When the character size of the subtitle information calculated as the subtitle control information is smaller than a predetermined character size threshold, the subtitle information is converted into the number of pieces of subtitle information until the character size becomes equal to or larger than the character size threshold. The broadcast receiver according to claim 2, wherein the broadcast receiver is generated by being divided.   When the reception status of a received broadcast deteriorates to a predetermined condition or less, when automatically switching to a broadcast with a higher reception sensitivity that is being simulcast, the received subtitle information of the received broadcast and Confirm whether or not the subtitle control information related to the subtitle information can be correctly decoded, and if it can be decoded, edit the subtitle information based on the received subtitle information of the broadcast, 4. The broadcast receiver according to claim 1, wherein the broadcast receiver displays the video information of the broadcast with stronger reception sensitivity instead of the caption information of the broadcast with stronger reception sensitivity.   In the broadcast receiving method for receiving a broadcast signal, when the content of the first broadcast program is the same as the content of the second broadcast program, the subtitle information of the second broadcast program is used as the first broadcast program. A broadcast receiving method characterized by displaying in place of subtitle information of a program. 6. A broadcast receiving program, wherein the broadcast receiving method according to claim 5 is implemented as a program that can be executed by a computer.

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