JP5200504B2 - Digital broadcast receiving apparatus and computer program - Google Patents

Description

  The present invention relates to a digital broadcast receiving apparatus and a computer program installed therein.

  Terrestrial digital broadcasts include high-resolution broadcasts intended for fixed receivers and low-resolution broadcasts intended for mobile receivers. Some in-vehicle receivers have a function of automatically switching between high-resolution broadcasting and low-resolution broadcasting according to the state of received radio waves.

  When switching between high-resolution broadcasting and low-resolution broadcasting, the difference between the output timings becomes a problem. Low-resolution broadcasts are encoded at a higher compression rate than high-resolution broadcasts, and the difference in time required for encoding on the broadcast station side and the difference in time required for decoding also occur on the receiver side. Appears as a difference. For this reason, simply switching from low-resolution broadcasting to high-resolution broadcasting causes the output of the low-resolution broadcasting to lag behind the output of the high-resolution broadcasting, so the scene to be output is lost and the viewer can It may become impossible to grasp.

  As a technique for solving such a problem, Patent Documents 1 and 2 describe that when high-resolution broadcasting and low-resolution broadcasting are simultaneous broadcasting, high-resolution broadcasting is synchronized with the output timing of low-resolution broadcasting. It is disclosed to delay the output.

JP 2004-166173 A JP 2007-049460 A

  However, each of the technologies described in Patent Documents 1 and 2 has a problem in that the real-time property of the broadcast cannot be maintained because the high-resolution broadcast is always output after being delayed. In addition, a storage medium having a sufficient capacity is required to delay the output of high-resolution broadcasting.

  The present invention solves such problems, i.e., without delaying the output of high-resolution broadcasts, so as not to affect the understanding of program contents by viewers as much as possible, from low-resolution broadcasts to high-resolution broadcasts. The purpose is to switch the output.

To achieve the above object, the present invention provides a first receiving means for receiving a high-resolution digital broadcast, a second receiving means for receiving a low-resolution digital broadcast, a first receiving means, and a second receiving means. A switching means for automatically switching between the first receiving means and the second receiving means according to the state of the radio wave, and the first receiving means and the second receiving means, Switching control means for causing the switching means to switch from the second receiving means to the first receiving means at a timing when the broadcast subtitles received by the receiving means are not displayed, and the first receiving means When the subtitle display included in the received broadcast is interrupted, the first storage processing means for storing the immediately preceding subtitle data and the first storage means for storing the subtitle data are provided, The switching control means is The broadcast subtitle data received by the second receiving means matches the subtitle data stored in the first storage means, the broadcast subtitle display received by the second receiving means is interrupted, and the first The digital broadcast receiving apparatus is configured to cause the switching means to switch from the second receiving means to the first receiving means on the condition that the subtitle display of the broadcast received by the receiving means has not been resumed .

In another aspect of the present invention, in the preceding invention, when the subtitle display of the broadcast received by the first receiving means is resumed , the first storage processing means interrupts the resumed subtitle display. Sometimes it is a digital broadcast receiver that updates caption data .

In another aspect of the present invention, in the previous invention, whether or not the caption data of the broadcast received by the second receiving means matches the caption data stored in the first storage means is determined by a control code. The digital broadcast receiving apparatus judges by comparing the excluded text data .

Further, the present invention provides a first receiving means for receiving a high-resolution digital broadcast, a second receiving means for receiving a low-resolution digital broadcast, a first receiving means, and a second receiving means, respectively. When the broadcast being received is a simulcast, the switching means for automatically switching between the first receiving means and the second receiving means according to the state of the radio wave, the first receiving means and the second receiving means are respectively A switching control means for causing the switching means to switch from the second receiving means to the first receiving means at a timing when the subtitles of the broadcast being received are not displayed; the first receiving means; and the second receiving Second storage processing means for storing a delay time difference calculated from a difference in display timing of subtitle data whose contents included in the broadcast received by each means match; and a second storage means for storing the delay time difference And when the subtitle display included in the broadcast received by the first receiving unit is interrupted, the switching control unit is configured to perform the first step after the delay time difference stored in the second storage unit has elapsed. The digital broadcast receiving apparatus causes the switching means to perform switching from the second receiving means to the first receiving means on the condition that the subtitle display of the broadcast received by the first receiving means has not been resumed .

In addition, the present invention provides a control computer of a digital broadcast receiving apparatus that receives a high resolution broadcast and a low resolution broadcast of a digital broadcast and outputs one of them, and the received high resolution broadcast and low resolution broadcast are simultaneous broadcasts. When the subtitle data is included in both broadcasts and the output is switched from the low resolution broadcast to the high resolution broadcast, the procedure for executing the switch at the timing when the subtitles of both broadcasts are not displayed is executed. The procedure for monitoring the timing at which the subtitle display included in the high resolution broadcast is erased, and the procedure for storing the content of the subtitle data immediately before the subtitle display is interrupted when the subtitle display of the high resolution broadcast is interrupted. The subtitle data for low-resolution broadcasts, the procedure for searching for the content that matches the saved high-resolution broadcast subtitle data, When the subtitle display of the low resolution broadcast that matches the content of the subtitle data of the image broadcast is erased, the subtitle display of the high resolution broadcast is restarted and the procedure for checking whether the subtitle display of the high resolution broadcast is restarted The computer program includes a procedure for switching the output to the high-resolution broadcast when there is not.

In addition, the present invention provides a control computer of a digital broadcast receiving apparatus that receives a high resolution broadcast and a low resolution broadcast of a digital broadcast and outputs one of them, and the received high resolution broadcast and low resolution broadcast are simultaneous broadcasts. When the subtitle data is included in both broadcasts and the output is switched from the low resolution broadcast to the high resolution broadcast, the procedure for executing the switch at the timing when the subtitles of both broadcasts are not displayed is executed. The procedure to store the delay time difference calculated from the difference in the display timing of the caption data with the same content included in the high resolution broadcast and the low resolution broadcast, and when the caption display included in the high resolution broadcast is interrupted On the condition that the subtitle display of the high-resolution broadcast has not been resumed after the stored delay time difference has elapsed. Is a computer program including a procedure for switching the output to Luo high resolution broadcast.

  According to the present invention, it is possible to switch the output from a low-resolution broadcast to a high-resolution broadcast without delaying the output of the high-resolution broadcast so as not to affect the viewer's understanding of the program contents as much as possible.

(First embodiment)
FIG. 1 is a block configuration diagram of a digital broadcast receiving apparatus according to the first embodiment of the present invention.

  This digital broadcast receiver is a device that receives terrestrial digital broadcasts, a tuner 1 that receives orthogonal wave frequency division multiplexed (OFDM) terrestrial digital broadcast signals, and reception of the tuner 1. An OFDM demodulator 2 that demodulates the signal, and divides the demodulated signal into a low resolution digital broadcast signal (hereinafter referred to as a low resolution broadcast signal) and a high resolution digital broadcast signal (hereinafter referred to as a high resolution broadcast signal). A demultiplexing unit (DEMUX) 3, a high-resolution broadcast video / audio decoder 4 as a first receiving means for receiving a high-resolution broadcast signal, and a low-resolution broadcast video as a second receiving means for receiving a low-resolution broadcast signal Output means for switching between the audio decoder 5 and the output of the high-resolution broadcast video / audio decoder 4 and the output of the low-resolution broadcast video / audio decoder 5. Comprising a switching unit 6, an output unit 7 for displaying the output from the output switching unit 6 as video and audio, a central processing unit (CPU) 8 and a storage device (MEM) 9 for controlling each part of the apparatus. The storage device 9 includes a ROM, a RAM, an EEPROM, an HDD, and the like. However, the storage device 9 is not limited to the above-described configuration as long as it is a device capable of reading and writing data.

  In this configuration, the central processing unit 8 monitors the operation of the high-resolution broadcast video / audio decoder 4 and the low-resolution broadcast video / audio decoder 5 and outputs the signal depending on the state of radio waves when the broadcast received by each is a simulcast. It functions as switching control means for controlling the switching unit 6 to automatically switch between the output of the high-resolution broadcast video / audio decoder 4 and the output of the low-resolution broadcast video / audio decoder 5.

  FIG. 2 is a flowchart showing a basic processing flow of the switching processing.

  High-resolution broadcast can be received (S11), high-resolution broadcast video and audio are being output (S12), and high-resolution broadcast cannot be received (S11), and high-resolution broadcast video and audio are not being output. In (S13), there is no need to switch. When the high resolution broadcast can be received (S11) and the video and audio of the high resolution broadcast are not being output (S12), the high resolution broadcast is switched to the high resolution broadcast (S14). If the high-resolution broadcast cannot be received (S11) and the video and audio of the high-resolution broadcast are being output (S13), the broadcast is switched to the low-resolution broadcast (S15).

  3 and 4 are diagrams for explaining the reason why the output of the low resolution broadcast is delayed from the output of the high resolution broadcast. FIG. 3 shows the transmission side, and FIG. 4 shows the reception side.

  As described above, since the low resolution broadcast needs to be encoded at a higher compression rate than the high resolution broadcast, a difference in time required for encoding occurs on the broadcast station side, which becomes a difference in transmission timing. Also, on the receiving side, a difference in time required for decoding occurs, and the total of them becomes a difference in output timing.

  The digital broadcast receiving apparatus according to the first embodiment of the present invention uses the high-resolution broadcast subtitles and the low-resolution broadcast subtitles without changing the output timing, and the respective subtitles are not displayed. Then, the output is switched from the low resolution broadcast to the high resolution broadcast. That is, when the central processing unit 8 switches from the output of the high-resolution broadcast video / audio decoder 4 to the output of the low-resolution broadcast video / audio decoder 5, the timings at which the subtitles of the broadcasts received by each are not displayed. The output switching unit 6 is controlled so that the switching is performed at the same time.

In digital broadcasting, since captions are transmitted as a signal different from the video signal, whether or not captions are actually displayed can be switched by user settings. For this reason, when the subtitles are not displayed,
(1) A state in which the user turns off image display of subtitles regardless of whether or not the received broadcast includes subtitle display;
(2) There are two states in which the user turns on subtitle image display, but the received broadcast does not include subtitle display.
Furthermore, (1)
(3) The state where the user turns off the image display of subtitles and the received broadcast does not include the subtitle display is included.
In the present invention, switching may be executed at any timing of (1) to (3). However, when there is a synchronous relationship between subtitle data and audio, the user turns on or off the subtitle image display. Regardless of whether or not it is set, it is desirable to perform switching at timings (2) and (3) when the received broadcast does not include caption display.

  Here, a case will be described as an example in which switching is performed on condition that the contents of the immediately preceding subtitles match. In the first embodiment, when the subtitle display included in the broadcast received by the low-resolution broadcast video / audio decoder 5 is interrupted, the central processing unit 8 uses the first storage unit to store the subtitle data immediately before that. It functions as a first storage processing means for storing in a certain storage device 9. The central processing unit 8 serves as switching control means so that the subtitle data of the broadcast received by the low-resolution broadcast video / audio decoder 5 matches the subtitle data stored in the storage device 9, the subtitle display of the broadcast is interrupted, and On the condition that the subtitle display of the broadcast received by the high resolution broadcast video / audio decoder 4 has not been resumed, the output switching unit 6 switches from the low resolution broadcast video / audio decoder 5 to the low resolution broadcast video / audio decoder 5. To do.

  This process will be described in detail with reference to FIG. FIG. 5 is a flowchart showing a flow of switching processing from low resolution broadcasting to high resolution broadcasting.

  The central processing unit 8 monitors the timing at which the subtitle display included in the high resolution broadcast is deleted (S21), and stores the content of the subtitle data immediately before the subtitle display is interrupted when the subtitle display of the high resolution broadcast is interrupted. It memorize | stores in the apparatus 9 (S22). Subsequently, the subtitle data of the low resolution broadcast is searched for that matches the content of the subtitle data of the high resolution broadcast stored in the storage device 9 (S23). When there is a subtitle display of the low resolution broadcast that matches the stored content of the subtitle data of the high resolution broadcast (S24), and it is deleted (S25), it is confirmed whether the subtitle display of the high resolution broadcast is resumed (S26). Then, when the subtitle display of the high resolution broadcast is not resumed, the output is switched to the high resolution broadcast (S27).

  There is no low resolution broadcast caption display that matches the content of the stored high resolution broadcast caption data (S24), and the stored caption data has been updated by the central processing unit 8 as the first storage processing means. In the case (S28), the process after S23 is repeated with the updated caption data. In addition, when the subtitle display of the high-resolution broadcast is resumed in the processes of S24, S25, and S28, the processes after S21 are repeated.

  In the above processing, whether the subtitle data of the low resolution broadcast matches the stored subtitle data of the high resolution broadcast may use different control codes for the high resolution broadcast and the low resolution broadcast. Judgment is made by comparing text data excluding control codes. At this time, there is a possibility that the contents of the kanji display are different between the high-resolution broadcast and the low-resolution broadcast, so that the subtitle data is considered to match if they match at a rate equal to or greater than a certain value. Whether subtitle data matches or not is judged by comparing with multiple subtitle data of low-resolution broadcasts because the broadcast station may send low-resolution broadcast data early considering the delay of low-resolution broadcasts. It is desirable to do.

(Second Embodiment)
Next, a second embodiment of the digital broadcast receiving apparatus according to the present invention will be described. The configuration of the digital broadcast receiving apparatus shown in FIG. 1 is common to the second embodiment described below. Therefore, the description of the overlapping configuration is omitted.

  In the second embodiment, a case where switching is performed based on a delay time difference calculated in advance will be described as an example. In the second embodiment, the central processing unit 8 uses the delay time difference (low resolution broadcast delay time) calculated from the difference in the display timing of the caption data whose contents included in the high resolution broadcast and the low resolution broadcast coincide with each other. It functions as a second storage processing means for storing in the storage device 9 which is the storage means. When the subtitle display included in the high resolution broadcast is interrupted, the central processing unit 8 resumes the subtitle display of the high resolution broadcast after the delay time difference stored in the storage device 9 has elapsed. On the condition that there is not, the output switching unit 6 is switched from the low resolution broadcast video / audio decoder 5 to the high resolution broadcast video / audio decoder 4.

  This process will be described in detail with reference to FIG. 6 and FIG. FIG. 6 is a flowchart showing a flow of low resolution broadcast delay time calculation processing, and FIG. 7 is a flowchart showing a flow of broadcast switching processing.

  In the second embodiment, the subtitle data included in the low-resolution broadcast that matches the content of the subtitle data included in the high-resolution broadcast is searched in advance, and the low-resolution broadcast is calculated from the difference in display timing of the subtitle data that matches the content. The delay time is calculated in advance. For this reason, when subtitle data of high resolution broadcasting is received, the subtitle data is saved (S31). Subsequently, when subtitle data of low-resolution broadcasting is received (S32), the subtitle data is compared with the subtitle data stored in S31 (S33). If there is matching subtitle data (S34), each display timing is calculated. Then, the low resolution broadcast delay time is calculated from the difference in display timing (S36). This low resolution broadcast delay time is calculated in consideration of the time required for switching.

  If there is no matching subtitle data (S34), the processing from S32 onward is repeated until the subtitle data of the high resolution broadcast is updated (S37). When the subtitle data of the high resolution broadcast is updated (S37), the processing from S32 onward is repeated.

  After calculating the low resolution delay time in this way, the central processing unit 8 resumes the high resolution broadcast subtitle display after the low resolution delay time has elapsed when the subtitle display of the high resolution broadcast is interrupted. The output is switched to high-resolution broadcasting on the condition that there is not. That is, when the high resolution broadcast can be received (S41) and the high resolution broadcast is not selected (S42), the subtitle display of the high resolution broadcast is deleted (S43), and the low resolution delay time has elapsed. (S44) If the subtitle display of the high resolution broadcast has not been resumed (S45), the central processing unit 8 causes the output switching unit 6 to switch from the low resolution broadcast to the high resolution broadcast (S46). When the subtitle display of the high resolution broadcast has been resumed before or after the low resolution delay time has elapsed (S47, S45), the processing from S43 onward is repeated for the resumed subtitle display.

  When the high resolution broadcast cannot be received (S41) and the high resolution broadcast is selected (S48), the central processing unit 8 causes the output switching unit 6 to switch the output to the low resolution broadcast (S49).

  In the above-described first or second embodiment, the digital broadcast receiving apparatus can also realize the same operation as described above by installing the following computer program in the storage device 9. For this purpose, the computer program is transmitted to the control computer of the digital broadcast receiving apparatus. The received high-resolution broadcast and low-resolution broadcast are simultaneous broadcasts. When the output is switched to the resolution broadcast, it is preferable to execute a procedure for performing the switch at a timing when the subtitles of both broadcasts are not displayed.

  Further, the procedure for executing the above switching is the procedure for monitoring the timing when the subtitle display included in the high resolution broadcast is deleted (S21), and the subtitle display is interrupted when the subtitle display of the high resolution broadcast is interrupted. The procedure for storing the content of the immediately preceding caption data (S22), the procedure for searching for the subtitle data of the low resolution broadcast that matches the content of the saved subtitle data of the high resolution broadcast (S23), A step (S26) for confirming whether or not the subtitle display of the high resolution broadcast is resumed when the subtitle display of the low resolution broadcast that matches the content of the subtitle data of the high resolution broadcast is deleted, and the subtitle display of the high resolution broadcast It is more preferable to include a procedure (S27) of switching the output to the high-resolution broadcast when is not restarted.

  Further, when it is confirmed that the subtitle display of the high-resolution broadcast is resumed in the confirmation procedure (S26), the storage procedure (S22), the search procedure (S23), and the confirmation procedure (S26) It is preferable to install a computer program that repeats the above.

  Furthermore, the switching procedure searches for subtitle data included in the low-resolution broadcast that matches the content of the subtitle data included in the high-resolution broadcast in advance, and calculates the delay time difference from the display timing difference of the subtitle data that matches the content. And the step of switching the output to the high-resolution broadcast on the condition that the subtitle display of the high-resolution broadcast is not resumed after the delay time difference has elapsed when the subtitle display of the high-resolution broadcast is interrupted (S46). It is preferable to install a computer program including

  As described above, when the digital broadcast receiving apparatus according to the embodiment of the present invention or the computer program according to the embodiment of the present invention is used, subtitles of high resolution broadcast and low resolution broadcast are used, and each subtitle is The output can be switched from low-resolution broadcast to high-resolution broadcast at a timing that is not displayed, and on the condition that the content of the previous subtitle is the same or according to the delay time difference calculated in advance The output can be switched. Thereby, the output is switched at a timing when no conversation is performed, and the influence on the grasp of the program content by the viewer can be suppressed to a small level. Also, since it does not delay the output of high-resolution broadcasting, real-time performance of broadcasting can be secured, and there is no need to add a large-capacity storage medium.

  The above-described embodiment relates to processing when data for displaying captions is included in a broadcast. However, in accordance with this processing, even if captions are actually displayed, they are not displayed. May be.

  In the above description, an in-vehicle receiving device that receives terrestrial digital broadcasting is assumed as the digital broadcasting receiving device. However, the present invention is not limited to such applications, and high resolution broadcasting and low resolution of digital broadcasting are not limited. The present invention can be similarly implemented in any form as long as the receiving apparatus can automatically switch between broadcasting and output.

It is a block block diagram of the digital broadcast receiver which concerns on the 1st Embodiment of this invention. It is a flowchart which shows the flow of the basic process which performs automatic switching with a high resolution broadcast and a low resolution broadcast by the digital broadcast receiver shown in FIG. It is a figure explaining the reason for which the output of a low resolution broadcast is behind the output of a high resolution broadcast on the transmission side. It is a figure explaining the reason for the output of a low resolution broadcast being further delayed from the output of a high resolution broadcast on the receiving side. It is a flowchart which shows the flow which performs the switching process from a low resolution broadcast to a high resolution broadcast by the digital broadcast receiver shown in FIG. It is a flowchart which shows the flow of the process of low-resolution broadcast delay time calculation performed by the digital broadcast receiver shown in FIG. It is a flowchart which shows the flow of the broadcast switching process performed by the digital broadcast receiver shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tuner 2 OFDM demodulation part 3 Demultiplexing part 4 High-resolution broadcast video audio decoder (1st receiving means)
5 Low-resolution broadcast video / audio decoder (second receiving means)
6 Output switching part (switching means)
7 Output unit 8 Central processing unit (switching control means, first storage processing means, second storage processing means)
9 Storage device (first storage means, second storage means)

Claims (6)

First receiving means for receiving a high-resolution digital broadcast;
A second receiving means for receiving a low-resolution digital broadcast;
When said first receiving means and said second receiving means and a broadcast being received respectively is simultaneous broadcasting, and automatically the second receiving means and said first receiving means depending on the state of radio wave Switching means for switching;
At the timing when the first receiving means and said second receiving means is not displayed subtitles broadcast being received respectively, the second of said switching means to switch from the receiving means to the first receiving means Switching control means to be executed,
A first storage processing unit for storing subtitle data immediately before the subtitle display included in the broadcast received by the first receiving unit;
First storage means for storing the caption data;
With
The switching control means is the broadcast received by the second receiving means when the caption data of the broadcast received by the second receiving means matches the caption data stored in the first storage means. On the condition that the subtitle display is interrupted and the subtitle display of the broadcast received by the first receiving means is not resumed, the switching from the second receiving means to the first receiving means is performed. A digital broadcast receiver characterized in that it is executed by a switching means . When the subtitle display of the broadcast received by the first receiving means is resumed, the first storage processing means updates the subtitle data when the resumed subtitle display is interrupted. The digital broadcast receiver according to claim 1. Whether the subtitle data of the broadcast received by the second receiving means matches the subtitle data stored in the first storage means is determined by comparing text data excluding control codes. The digital broadcast receiving apparatus according to claim 1, wherein: First receiving means for receiving a high-resolution digital broadcast;
A second receiving means for receiving a low-resolution digital broadcast;
When the broadcasts received by the first receiving means and the second receiving means are simulcasts, the first receiving means and the second receiving means are automatically activated according to the state of radio waves. Switching means for switching;
The switching means switches from the second receiving means to the first receiving means at the timing when the subtitles of the broadcasts respectively received by the first receiving means and the second receiving means are not displayed. Switching control means to be executed,
Second storage processing means for storing a delay time difference calculated from a difference in display timing of subtitle data having the same content included in the broadcast received by each of the first receiving means and the second receiving means;
Second storage means for storing the delay time difference;
With
The switching control means includes
When the subtitle display included in the broadcast received by the first receiving means is interrupted, the reception of the first receiving means is performed after the delay time difference stored in the second storage means has elapsed. A digital broadcast receiving apparatus that causes the switching means to switch from the second receiving means to the first receiving means on the condition that subtitle display of the broadcast being performed has not been resumed. To the control computer of the digital broadcast receiver that receives the high resolution broadcast and the low resolution broadcast of the digital broadcast and outputs one of them
The received high-resolution broadcast and low-resolution broadcast are simultaneous broadcasts, and both broadcasts contain subtitle data. When switching output from low-resolution broadcast to high-resolution broadcast, the subtitles of both broadcasts are displayed. The procedure to execute the switch at a timing that is not
The procedure for performing the switching is as follows:
A procedure to monitor when the subtitle display included in the high-resolution broadcast is erased;
When subtitle display of high-resolution broadcasting is interrupted, a procedure for storing the content of subtitle data immediately before the subtitle display is interrupted;
Finding low-resolution broadcast caption data that matches the saved high-resolution broadcast caption data,
When the subtitle display of the low-resolution broadcast that matches the content of the saved high-resolution broadcast subtitle data is erased, the procedure for checking whether the subtitle display of the high-resolution broadcast is resumed,
And a procedure for switching the output to the high-resolution broadcast when the subtitle display of the high-resolution broadcast is not resumed. To the control computer of the digital broadcast receiver that receives the high resolution broadcast and the low resolution broadcast of the digital broadcast and outputs one of them,
The received high-resolution broadcast and low-resolution broadcast are simultaneous broadcasts, and both broadcasts contain subtitle data. When switching output from low-resolution broadcast to high-resolution broadcast, the subtitles of both broadcasts are displayed. The procedure to execute the switch at a timing that is not
The procedure for performing the switching is as follows:
A procedure for storing a delay time difference calculated from a difference in display timing of subtitle data in which contents included in the high-resolution broadcast and the low-resolution broadcast match;
When the subtitle display included in the high resolution broadcast is interrupted, the subtitle display of the high resolution broadcast is not resumed after the stored delay time difference has elapsed. A computer program comprising a procedure for switching output to a resolution broadcast.

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