JP6029341B2 - In-vehicle digital broadcast receiving apparatus and subtitle display control method - Google Patents

Description

  The present invention relates to an in-vehicle digital broadcast receiving apparatus and a caption display control method, and is particularly suitable for use in an in-vehicle digital broadcast receiving apparatus having a function of appropriately switching between full-segment broadcasting and one-segment broadcasting as a vehicle moves. is there.

  Japanese terrestrial digital broadcasting has a structure in which the frequency bandwidth of one channel is divided into 13 segments, of which 12 segments are allocated to high-definition broadcasting and 4 segments are allocated to standard-definition broadcasting. In addition, only one segment is allocated to broadcasting for mobile terminals such as mobile phones and in-vehicle devices having a small screen from the viewpoint of emphasizing mobility rather than image quality.

  Broadcasting for mobile terminals is referred to as “one-segment broadcasting” by omitting one segment. On the other hand, high-definition broadcasting that broadcasts one program using all 12 segments and standard-definition broadcasting that broadcasts up to three programs using 12 segments are called “full-segment broadcasting”. When receiving a digital broadcast of a channel corresponding to the current position of the vehicle, it is desired to be able to receive as much as possible a full segment broadcast with better image quality than the one-segment broadcast.

  In-vehicle digital broadcast receivers generally have a function of automatically switching between one-segment broadcasting and full-segment broadcasting depending on the reception status of radio waves. That is, the in-vehicle digital broadcast receiving apparatus can be switched to full-segment broadcasting that is weak against noise but of high quality when radio wave reception is good. On the other hand, when the reception condition of radio waves is poor, it is switched to one-segment broadcasting with low quality but strong against noise.

  Note that due to the difference in compression format between 1Seg broadcasting and Full Seg broadcasting, the broadcasting timing of 1Seg broadcasting is delayed by several seconds with respect to Full Seg broadcasting. Therefore, when switching between one-segment broadcasting and full-segment broadcasting depending on the reception status of radio waves, the same content is repeatedly output over several seconds, or the content for several seconds is missing This causes a problem that the user feels uncomfortable in viewing.

  Conventionally, inventions aimed at solving such problems have been proposed (see, for example, Patent Documents 1 and 2). In the invention described in Patent Document 1, based on an offset value indicating a time difference between display timings of a high-resolution video frame (corresponding to full-seg broadcasting) and a low-resolution video frame (corresponding to one-seg broadcasting) showing video of the same content, The frame with the earlier display timing is displayed with a delay by a time corresponding to the offset value.

  Further, in the invention described in Patent Document 2, the delay amount of the first broadcast signal (corresponding to one-segment broadcasting) being delayed with respect to the second broadcast signal (corresponding to full-segment broadcasting) is detected. Then, when switching from the second broadcast signal to the first broadcast signal, based on the delay amount detection signal, a scene that can delay the second broadcast signal in a state that does not give a sense of discomfort in viewing is detected, and the delay is detected. In the scene instructed based on the scene detection signal, the second broadcast signal is switched to the first broadcast signal in a state where the second broadcast signal is delayed.

JP 2007-49460 A JP 2010-62630 A

  In the inventions described in Patent Documents 1 and 2, when switching from full segment broadcasting to one segment broadcasting, output timing is synchronized by delaying full segment broadcasting. However, for this purpose, the amount of delay of one-segment broadcasting with respect to full-segment broadcasting can be detected, scenes that can delay full-segment broadcasting in a state that does not cause discomfort in viewing are detected, and the output timing of full-segment broadcasting is delayed. There was a problem that complicated processing had to be performed.

  When switching from 1Seg broadcasting to full Seg broadcasting, if the output timing is not synchronized, the output timing of Full Seg broadcasting will be several seconds earlier than that of One Seg broadcasting, so a few seconds will be lost in video and audio. End up. Although there is no difference between the lack of video and the lack of sound, the lack of sound may cause inconvenience to the user beyond the sense of discomfort. For example, if you switch from 1Seg broadcasting to Full Seg broadcasting while watching a quiz program, you may lose the sound of the main part, such as "Answer is ... Next problem." Inconvenience occurs.

  The present invention has been made to solve such problems. When switching from one-segment broadcasting to full-segment broadcasting, the present invention is delayed with respect to full-segment broadcasting without performing complicated processing. The purpose is to make it possible to compensate for the lack of audio information in one-segment broadcasting.

In order to solve the above-described problems, in the present invention, when switching from one-segment broadcasting to full-segment broadcasting, caption information is displayed regardless of whether the caption display function is set on or off. It is made to display. At this time, it is determined whether the program being broadcast is a recorded program or a live program, and subtitle information to be displayed according to the determined program format is subtitle information from one-segment broadcasting or subtitle information from full-segment broadcasting I am trying to decide.

  According to the present invention configured as described above, when switching from one-segment broadcasting to full-segment broadcasting, the output timing of full-segment broadcasting is earlier than that of one-segment broadcasting. However, even if the audio information is lost, the caption information is displayed instead, so that the lack of the audio information can be complemented by the display of the caption information. In addition, since the display of caption information is originally a function provided in the in-vehicle digital broadcast receiving apparatus, it is not necessary to add complicated processing.

It is a figure which shows the structural example of the vehicle-mounted digital broadcast receiver by this embodiment. It is a figure which shows typically the operation example of a subtitle display at the time of switching from one segment broadcasting to full segment broadcasting. It is a figure which shows the specific example of a caption display in case the program in broadcast is a recording program. It is a figure which shows the specific example of a caption display in case the program in broadcast is a live program. It is a figure for demonstrating the display position of subtitle information. It is a flowchart which shows the operation example of the vehicle-mounted digital broadcast receiver by this embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration example of an in-vehicle digital broadcast receiving apparatus according to the present embodiment. In FIG. 1, an antenna 1 receives radio waves of digital broadcasting. The tuner 2 selectively extracts a broadcast wave signal having a reception frequency matching a desired channel from the digital broadcast radio wave received by the antenna 1 and outputs the broadcast wave signal.

  The OFDM demodulator 3 demodulates the broadcast wave signal received by the tuner 2 by OFDM (Orthogonal Frequency-Division Multiplexing) to obtain a transport stream (hereinafter referred to as TS). The error correction unit 4 corrects errors generated in the transmission path for the TS demodulated by the OFDM demodulation unit 3.

  The demultiplexer unit 5 obtains a video stream, an audio stream, and a data stream by separating the multiplexed TS. Then, the demultiplexer unit 5 outputs the audio stream to the audio decoder unit 6, outputs the video stream to the video decoder unit 7, and outputs the data stream to the data decoder unit 8.

  Here, in the data stream, subtitle information generated corresponding to the audio information included in the audio stream, information on the reception channel, information on the broadcast program, BER (Bit Error Rate) indicating the error rate of the received signal, etc. It is included. The information regarding the reception channel includes hierarchical information indicating whether the broadcast being received is a one-segment broadcast or a full-segment broadcast. The information related to the broadcast program includes program form information indicating whether the broadcast program being received is a recorded program or a live program.

  The audio decoder unit 6 decodes the input audio stream and outputs it as an audio signal from the speaker 21. The video decoder unit 7 decodes the input video stream and outputs it to the display 22 as a video signal. The data decoder unit 8 decodes the input data stream, and outputs information on the reception channel, information on the broadcast program, BER and the like as control data to the control unit 10 and outputs caption information to the display 22.

  The control unit 10 controls the overall operation of the in-vehicle digital broadcast receiving apparatus. That is, the control unit 10 controls operations of the tuner 2, the OFDM demodulation unit 3, the error correction unit 4, the demultiplexer unit 5, the audio decoder unit 6, the video decoder unit 7, and the data decoder unit 8.

  The control unit 10 includes a reception sensitivity detection unit 10a, a channel switching unit 10b, a caption setting determination unit 10c, a caption display control unit 10d, a switching determination unit 10e, and a program form determination unit 10f as functional configurations. The reception sensitivity detection unit 10a detects the reception sensitivity related to the broadcast being received based on, for example, the BER supplied from the data decoder unit 8.

  The channel switching unit 10b switches the reception channel and reception layer in the tuner 2. For example, the channel switching unit 10b controls the tuner 2 so as to switch between full-segment broadcasting and one-segment broadcasting appropriately according to the reception sensitivity detected by the reception sensitivity detection unit 10a. Specifically, control is performed to receive full-seg broadcasting when the BER value is smaller than a predetermined value and the reception sensitivity is good, and to receive one-seg broadcasting when the reception sensitivity deteriorates when the BER value is equal to or greater than the predetermined value. .

  The subtitle setting determination unit 10 c determines whether the subtitle display function is set to on or off based on setting information stored in the system memory 20. Note that whether the caption display function is turned on or off can be arbitrarily set by the user operating an operation unit (not shown), and the set information is stored in the system memory 20. It has become.

  The caption display control unit 10d controls display of caption information included in the data stream on the display 22. In principle, the subtitle display control unit 10d controls the data decoder unit 8 to display subtitle information on the display 22 when the subtitle setting determination unit 10c determines that the subtitle display function is turned on. On the other hand, if the subtitle setting determination unit 10c determines that the subtitle display function is set to OFF, the subtitle display control unit 10d controls the data decoder unit 8 so that the subtitle information is not displayed on the display 22.

  The switching determination unit 10e determines whether or not the channel switching unit 10b has switched from the one-segment broadcasting to the full-segment broadcasting. This determination can be made, for example, by receiving from the channel switching unit 10b a switching notification indicating that switching from one-segment broadcasting to full-segment broadcasting. Alternatively, it is possible to determine whether or not switching from the one-segment broadcasting to the full-segment broadcasting is performed based on the hierarchical information supplied as control data from the data decoder unit 8. Alternatively, based on the BER supplied from the data decoder unit 8 or the reception sensitivity detected by the reception sensitivity detection unit 10a based on the BER, it is determined whether or not switching from the one-segment broadcasting to the full-segment broadcasting is performed. It is also possible to do.

  The above-described caption display control unit 10d is exceptionally set so that the caption display function is set to on or off when the switching determination unit 10e determines that switching from one-segment broadcasting to full-segment broadcasting has been performed. Regardless of whether the subtitle information is displayed on the display 22, the data decoder unit 8 is controlled.

  Based on the program form information supplied as control data from the data decoder unit 8, the program form determination unit 10f determines the program form whether the program being broadcast is a recorded program or a live program. The above-described caption display control unit 10d uses the program format determined by the program format determination unit 10f when controlling the data decoder unit 8 to display the caption information on the display 22 when switching from one-segment broadcasting to full-segment broadcasting. Accordingly, the subtitle information to be displayed is determined.

  In the case of a recorded program, caption information corresponding to the audio information is displayed on the display 22 at the same timing as the audio information output to the speaker 21. On the other hand, in the case of live broadcasting, caption information corresponding to audio information output to the speaker 21 is displayed on the display 22 with a delay of several seconds from the audio information. As described above, since the subtitle information corresponding to the audio information is displayed at different timings depending on whether the program is a recorded program or a live program, it is preferable to determine the subtitle information to be displayed according to the program format.

  Specifically, when the program form determination unit 10f determines that the program form is a recorded program, the subtitle display control unit 10d displays the subtitle information from the one-segment broadcasting received before the switching is performed on the display 22. The data decoder unit 8 is controlled so as to be displayed. At this time, the subtitle display control unit 10d controls to display subtitle information from the one-segment broadcasting for a predetermined time. For this operation, the data decoder unit 8 needs to store and save the subtitle information of the one-segment broadcasting acquired immediately before the switching for at least a predetermined time even after the one-segment broadcasting is switched to the full-segment broadcasting. .

  Further, the subtitle display control unit 10d is a data decoder unit that causes the display 22 to display subtitle information from the full segment broadcast received after the switching when the program form determination unit 10f determines that the program form is a live broadcast. 8 is controlled. At this time, the caption display control unit 10d performs control so that caption information from the full-segment broadcasting is displayed for a predetermined time. Note that the predetermined time for displaying full-segment broadcasting subtitle information may not be the same as the predetermined time for displaying one-segment broadcasting subtitle information.

  2 to 4 are diagrams schematically illustrating an example of subtitle display operation when switching from one-segment broadcasting to full-segment broadcasting. Here, for convenience of explanation, the broadcast contents to be output are shown in units of one second. In addition, it is assumed that the caption display function is set to off. Further, it is assumed that the one-segment broadcasting is delayed by one second with respect to the full-segment broadcasting.

  FIG. 2A shows a switching state between full-segment broadcasting and one-segment broadcasting. In the example shown in FIG. 2A, when the full segment broadcast is received for 2 seconds, the reception state deteriorates and the broadcast is switched to the one segment broadcast. At this time, since the one-segment broadcast is delayed by one second with respect to the full-segment broadcast, the same content as the video and audio of the second second of the full-segment broadcast is repeatedly output in the one-segment broadcast. However, since there is no loss of video and audio, subtitle information is not forcibly displayed at this timing.

  After that, when the one-segment broadcasting is received for 3 seconds, the reception state is recovered and the mode is switched to the full-segment broadcasting. At this time, since the full-segment broadcasting is advanced by one second from the one-segment broadcasting, the video and audio at the fifth second of the full-segment broadcasting are lost and are not output. In order to complement this omission, the subtitle information is forcibly displayed at this timing in the present embodiment.

  FIG. 2B is a diagram showing an example of caption display when the program being broadcast is a recorded program. As shown in FIG. 2B, when the program form is a recorded program, the caption display control unit 10d displays the caption information from the one-segment broadcasting received before switching on the display 22 for a predetermined time (here (2 seconds). After displaying the subtitle information for a predetermined time, the subtitle information is deleted and switched to normal full segment broadcasting output.

  FIG. 3 is a diagram showing a specific example of caption display when the program being broadcast is a recorded program. Here, FIG. 3A shows an operation example of the present embodiment. FIG. 3B shows a broadcasting state of one-segment broadcasting, and FIG. 3C shows a broadcasting state of full-segment broadcasting. In the example of FIG. 3A, when switching from one-segment broadcasting to full-segment broadcasting while watching a quiz program, the middle is missing, such as "answer is ... next problem." The audio information “Tokyo Sky Tree” is supplemented by forced display of subtitle information.

  As shown in FIG. 3B, in the case of a recorded program, caption information corresponding to audio information can be received at the same timing as the audio information. Therefore, as shown in FIG. 3 (a), the subtitle information of the one seg broadcast received before switching to the full seg broadcasting is displayed for a predetermined time after switching to the full seg broadcast, so that the missing audio information is displayed in the subtitle information. It can be complemented by forced display.

  FIG. 2C is a diagram showing an example of caption display when the program being broadcast is a live program. As shown in FIG. 2C, when the program form is a live program, the subtitle display control unit 10d displays the subtitle information from the full segment broadcast received after the switching on the display 22 for a predetermined time (here, 2 seconds). Let After displaying the subtitle information for a predetermined time, the subtitle information is deleted and switched to normal full segment broadcasting output.

  FIG. 4 is a diagram showing a specific example of caption display when the program being broadcast is a live program. Here, FIG. 4A shows an operation example of the present embodiment. FIG. 4B shows the broadcasting state of one-segment broadcasting, and FIG. 4C shows the broadcasting state of full-segment broadcasting. In the example of FIG. 4 (a), when switching from one-segment broadcasting to full-segment broadcasting while viewing a news program, “It was performed at Tokyo Dome” ... “Next news.” Is supplemented by subtitle information compulsory display, with voice information “Giant vs. Hanshin won 3 vs. 2”.

  As shown in FIG. 4C, in the case of a live program, caption information corresponding to audio information is received at a timing delayed by several seconds from the audio information. Therefore, as shown in FIG. 4A, if the subtitle information from the full segment broadcast received after switching is displayed for a predetermined time, the missing audio information can be complemented by the forced display of the subtitle information.

  In addition, when the program form determination unit 10f determines that the program form is a recorded program, the subtitle display control unit 10d determines the caption information depending on whether the caption display function is set to on or off. It is preferable to determine the display position. This is because, when the caption display function is originally set to ON, when the caption information is forcibly displayed when switching from the one-segment broadcasting to the full-segment broadcasting, a collision occurs in the caption information display.

  FIG. 5 is a diagram for explaining the display position of the caption information. When the program form determination unit 10f determines that the program form is a recorded program and the subtitle setting determination unit 10c determines that the subtitle display function is set to OFF, the subtitle display control unit 10d determines that FIG. As shown in (a), the subtitle information received from the one-segment broadcasting received before switching is displayed at a predetermined position (lower part of the screen) where the subtitle information is displayed when the subtitle display function is on.

  The subtitle display control unit 10d determines that the program form is a recorded program by the program form determination unit 10f, and the subtitle display determination unit 10c determines that the subtitle display function is set to ON. As shown in FIG. 5B, the subtitle information from the full-segment broadcasting received after the switching is displayed at a predetermined position (the lower part of the screen), and the subtitle information from the one-segment broadcasting received before the switching is performed. , It is displayed at a position different from the predetermined position (for example, at the top of the screen).

  FIG. 6 is a flowchart showing an operation example of the in-vehicle digital broadcast receiving apparatus according to the present embodiment configured as described above. The flowchart shown in FIG. 6 starts when the power of the in-vehicle digital broadcast receiving apparatus is turned on. First, the switching determination unit 10e determines whether the channel switching unit 10b has switched from one-segment broadcasting to full-segment broadcasting (step S1).

  Here, when it is determined that the switching from the one-segment broadcasting to the full-segment broadcasting has been performed, the program form determination unit 10f records the program being broadcast based on the program form information supplied as control data from the data decoder unit 8. The program form of a program or a live program is determined (step S2). If the program being broadcast is a recorded program, the caption setting determination unit 10c determines whether the caption display function is set to OFF based on the setting information stored in the system memory 20 (step). S3).

  In step S2, the caption display control unit 10d determines that the program form is a recorded program by the program form determination unit 10f, and determines in step S3 that the caption display function is set to OFF by the caption setting determination unit 10c. If it has been done, the subtitle information from the one-segment broadcasting received before switching is displayed on the lower part of the screen of the display 22 (step S4).

  On the other hand, the subtitle display control unit 10d determines in step S2 that the program form is a recorded program by the program form determination unit 10f, and the subtitle display determination function 10c sets the subtitle display function on in step S3. If it is determined that the subtitle information from the full-segment broadcasting received after the switching is displayed at the bottom of the screen of the display 22, the subtitle information from the one-segment broadcasting received before the switching is displayed at the top of the screen. (Step S5).

  Next, the caption display control unit 10d determines whether or not a predetermined time has elapsed after starting the forced display of the caption information from the one-segment broadcasting in step S4 or step S5 (step S6), and the predetermined time has elapsed. At this point, the forced display of subtitle information from the one-segment broadcasting is terminated (step S7). Thereby, the process of the flowchart shown in FIG.

  In step S2, when the program form determination unit 10f determines that the program being broadcast is a live program, the subtitle setting determination unit 10c displays subtitles based on the setting information stored in the system memory 20. It is determined whether or not the function is set to off (step S8).

  The caption display control unit 10d determines in step S2 that the program form determination unit 10f determines that the program form is a live program, and in step S8 determines that the caption display function is set off by the caption setting determination unit 10c. If it has been done, the subtitle information from the full segment broadcast received after the switching is displayed at the bottom of the screen of the display 22 (step S9).

  On the other hand, the subtitle display control unit 10d determines in step S2 that the program form is a live program by the program form determination unit 10f, and the subtitle display determination unit 10c sets the subtitle display function to ON in step S8. Is determined, the process of the flowchart shown in FIG. 6 is terminated without doing anything. In this case, subtitle information from the full-segment broadcasting received after switching is displayed at the bottom of the screen of the display 22 without special processing, so that the lack of audio information is complemented by the display of subtitle information. Become.

  The subtitle display control unit 10d determines whether or not a predetermined time has elapsed after starting the forced display of the subtitle information from the full segment broadcasting in step S9 (step S10), and from the full segment broadcasting when the predetermined time has elapsed. The forced display of the subtitle information is terminated (step S11). Thereby, the process of the flowchart shown in FIG. 6 is terminated.

  As described above in detail, according to the present embodiment, even if audio information is lost when switching from one-segment broadcasting to full-segment broadcasting, subtitle information corresponding to the audio information is displayed. Can be complemented by displaying the caption information. In addition, since the display of caption information is originally a function provided in the in-vehicle digital broadcast receiving apparatus, it is not necessary to add complicated processing. In other words, according to the present embodiment, when switching from one-segment broadcasting to full-segment broadcasting, the caption information indicates the lack of audio information of one-segment broadcasting that is delayed with respect to full-segment broadcasting without performing complicated processing. This can be complemented by the display.

  In the above embodiment, an example in which subtitle information is displayed for a predetermined time immediately after switching from one-segment broadcasting to full-segment broadcasting has been described, but the present invention is not limited to this. For example, subtitle information for a predetermined time to be forcibly displayed may be stored in a memory so that the subtitle information can be read from the memory and displayed at an arbitrary later timing.

  Further, in the above embodiment, when switching from one-segment broadcasting to full-segment broadcasting when the program being broadcast is a live program, the subtitle information from the full-segment broadcasting received after the switching is displayed on the display 22 for a predetermined time. Although the example to make was demonstrated, this invention is not limited to this. As shown in FIG. 4, the audio information “has been performed at Tokyo Dome” that was output in the one-segment broadcasting just before the switching, and the subtitle information “giant vs. Hanshin is 3 to 2” corresponding to the audio information that follows. ”Has won,” extra caption information is displayed.

  Therefore, when switching from one-segment broadcasting to full-segment broadcasting, subtitle information from full-segment broadcasting is not displayed during the delay time of one-segment broadcasting with respect to full-segment broadcasting. Information may be displayed. In this way, in the example of FIG. 4, the subtitle information “Giant vs. Hanshin won 3 vs. 2 but Hanshin won” does not change the timing, but before that, additional subtitle information “Tokyo Dome” "Made in" is not displayed.

  In addition, each of the above-described embodiments is merely an example of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed in a limited manner. That is, the present invention can be implemented in various forms without departing from the gist or the main features thereof.

DESCRIPTION OF SYMBOLS 10 Control part 10c Subtitle setting determination part 10d Subtitle display control part 10e Switching determination part 10f Program form determination part

Claims (8)

An in-vehicle digital broadcast receiving device having a function of appropriately switching between full-segment broadcasting and one-segment broadcasting,
A switching determination unit for determining whether or not switching from the one-segment broadcasting to the full-segment broadcasting is performed;
When the switching determination unit determines that switching from the one-segment broadcasting to the full-segment broadcasting is performed, the caption information is displayed regardless of whether the caption display function is set to on or off. A subtitle display control unit for controlling
A program form determination unit for determining whether the program being broadcast is a recorded program or a live program,
The subtitle display control unit determines whether the subtitle information to be displayed is subtitle information from one-segment broadcasting or subtitle information from full-segment broadcasting according to the program form determined by the program form determining unit. An in-vehicle digital broadcast receiver characterized by the above.   When the program form determination unit determines that the program form is the recorded program, the subtitle display control unit displays the subtitle information from the one-segment broadcasting received before the switching is performed. The in-vehicle digital broadcast receiver according to claim 1, wherein   The in-vehicle digital broadcast receiving apparatus according to claim 2, wherein the subtitle display control unit controls the subtitle information from the one-segment broadcasting to be displayed for a predetermined time. A subtitle setting determination unit that determines whether the subtitle display function is set to on or off;
The subtitle display control unit, when the program form determination unit determines that the program form is the recorded program, and the subtitle setting determination unit determines that the subtitle display function is set to off, The subtitle information from the one-segment broadcasting received before the switching is displayed at a predetermined position where the subtitle information is displayed when the subtitle display function is on. In-vehicle digital broadcast receiver.   The subtitle display control unit, when the program form determination unit determines that the program form is the recorded program, and the subtitle setting determination unit determines that the subtitle display function is set to ON, Display the subtitle information from the full-segment broadcasting received after the switching at the predetermined position, and display the subtitle information from the one-segment broadcasting received before the switching is performed at a position different from the predetermined position. The in-vehicle digital broadcast receiving apparatus according to claim 4.   The subtitle display control unit displays subtitle information from the full-segment broadcast received after the switching when the program form determination unit determines that the program form is the live broadcast. The in-vehicle digital broadcast receiver according to 1.   The in-vehicle digital broadcast receiving apparatus according to claim 6, wherein the subtitle display control unit controls to display subtitle information from the full-segment broadcasting for a predetermined time. A subtitle display control method in an in-vehicle digital broadcast receiving device having a function of appropriately switching between full-segment broadcasting and one-segment broadcasting,
A first step of determining whether or not switching from the one-segment broadcasting to the full-segment broadcasting is performed by the switching determination unit of the in-vehicle digital broadcast receiving device;
A second step in which the program form determination unit of the in-vehicle digital broadcast receiving apparatus determines whether the program being broadcast is a recorded program or a live program;
When the switching determination unit determines that the switching from the one-segment broadcasting to the full-segment broadcasting is performed, the caption display control unit of the in-vehicle digital broadcast receiving device sets whether the caption display function is turned on or off. Regardless of whether it is set, according to the program form determined by the program form determination unit, it is determined whether the caption information to be displayed is caption information from one-segment broadcasting or caption information from full-segment broadcasting , And a third step of controlling to display the determined subtitle information.

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