JP4785544B2 - Broadcast receiving apparatus and method - Google Patents

Description

  The present invention relates to a technique for displaying video and playing audio when a service such as a program is switched in a broadcast receiving apparatus that receives digital broadcast waves.

  Conventionally, in digital terrestrial broadcasting receivers, if the reception environment of broadcast waves deteriorates, such as when moving in a car or hidden behind a building, video and audio data cannot be received correctly, so screen display The image inside may be distorted or abnormal noise may occur. These video disturbances and abnormal sounds are unpleasant for the user and cannot withstand viewing. In order to display a video that can withstand the user's viewing in response to such problems, when the reception environment deteriorates and an error occurs, the video display stops and “Cannot receive” appears on the screen. A method of presenting an error message to the user is used.

  However, in the above-described method, when the reception environment is deteriorated or improved and the environment is repeatedly changed, the video display and the error message display are alternately repeated, which is troublesome for the user. End up. Therefore, when an error occurs, there is a method of continuously displaying the last displayed video until the broadcast wave can be normally received thereafter. For example, the technique described in Patent Document 1 is disclosed as a countermeasure against video disturbance and abnormal sounds accompanying the deterioration of the reception environment. This is to stop or stop the received signal before noise appears when the reception environment deteriorates.

JP 2004-208066 A

  FIG. 7 is a diagram showing an example of screen display and audio reproduction in a conventional broadcast receiving apparatus. After the reception environment deteriorates, the last displayed video is continued until the broadcast wave can be normally received. An example using a display method is shown. When a video of a news program is displayed and the sound is being played (see the left figure), if the video cannot be received correctly, the video stops with the news video displayed last. Then, when the reception state is poor and the program is switched from news to drama and the drama starts, the sound of the drama is played even though the video of the news program is displayed (see the right figure).

  In other words, when a user is watching a news program using a broadcast receiving device, for example, if a car enters a highway or enters a place where buildings are crowded, the reception sensitivity deteriorates and the video is not updated. May play audio. This is because the audio frame is shorter than the video frame, and therefore the probability that the audio frame can be normally received is higher than the video frame. As described above, since the time during which only the video is not decoded and displayed becomes long and the drama sound is being played back, the news video may remain displayed. There is a problem in that they do not match and give the user discomfort.

  Therefore, the present invention has been made to solve the above-described problems, and the purpose of the present invention is to discriminate between the display of video and the like and the reproduction of audio even when the broadcast wave cannot be received correctly due to the deterioration of the reception environment. It is an object of the present invention to provide a broadcast receiving apparatus and method that can reduce the discomfort caused by.

In order to solve the above-described problems, a broadcast receiving apparatus according to the present invention detects a broadcast receiving unit that receives a broadcast program, a display unit that displays the received broadcast program, and a switching timing of the broadcast program. Te If you can not correctly display the next broadcast program, since the timing of the switching, characterized in that and a control means for erasing the display information of the broadcast program before that has been displayed on the display means.

  The broadcast receiving apparatus according to the present invention is characterized in that the display information to be erased is video, data broadcast, or caption.

  The broadcast receiving apparatus according to the present invention displays the video when the control means receives the key frame of the video after erasing the display information, and displays the subtitle when the subtitle is received, When the data broadcast is received, the data broadcast is displayed.

  The broadcast receiving apparatus according to the present invention is characterized in that the control means displays a normal video macroblock of a video keyframe after erasing the display information.

  The broadcast receiving apparatus according to the present invention is characterized in that the control means calculates the number of normal video macroblocks and displays the normal video macroblocks based on the calculated number.

  Also, the broadcast receiving apparatus according to the present invention is characterized in that the control means displays the caption when the key frame of the video is abnormal and the caption is normal after erasing the display information.

  In the broadcast receiving apparatus according to the present invention, the control means calculates the number of normal macroblocks after erasing the display information, the video keyframe is abnormal, the subtitle is normal, and The subtitle is displayed when the calculated value is equal to or less than a preset value.

  The broadcast receiving apparatus according to the present invention is characterized in that when the control means receives a key frame of a normal video after displaying the subtitle, the video is displayed together with the subtitle.

  In the broadcast receiving apparatus according to the present invention, the control means detects the switching timing of the broadcast program based on a program start time and duration included in an EIT (Event Information Table) of the received broadcast program. And

Although the present invention has been described as a broadcast receiving apparatus, the present invention can be realized as a method substantially corresponding to these, and the present invention includes a broadcast receiving method. That is, the broadcast receiving method according to the present invention is a broadcast receiving method for receiving a broadcast program and displaying the program on a screen, detecting the switching timing of the received broadcast program, and the next broadcast program at the timing. to not be displayed correctly, since the timing of the switches, and having the steps of: erasing the display information of the broadcast program before that has been displayed.

  According to the present invention, even when the broadcast wave cannot be correctly received due to the deterioration of the reception environment, the display of the broadcast program being displayed is erased after the broadcast program switch timing. In this case, there is no discrepancy between the display of video and the like and the display of audio, and it is possible to reduce the discomfort caused by it.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a broadcast receiving apparatus according to an embodiment of the present invention. The broadcast receiving apparatus 1 includes an antenna 10, a control unit 11, a TV control unit 12, a separation unit 13, an audio decoding unit 14, a video decoding unit 15, a caption processing unit 16, a data broadcast processing unit 17, a display update management unit 18, A display unit 19 and an LCD 20 are provided.

  The TV control unit 12 receives an RF (Radio Frequency) signal of a broadcast wave via the antenna 10. Further, a frequency (channel) designation command is input from the control unit 11 and the received RF signal is tuned. Specifically, the TV control unit 12 converts the frequency of the RF signal into a channel signal, demodulates the channel signal, and generates a TS (Transport Stream) signal of MPEG (Moving Picture Coding Experts Group). . Further, the TV control unit 12 detects a decoding error at the time of demodulation of the broadcast wave, and outputs the decoding error to the display update management unit 18.

  The separation unit 13 receives the TS signal from the TV control unit 12, detects an audio packet, a video packet, a caption packet, a data broadcast packet, and the like based on the packet ID in the TS signal, and separates each packet. Audio data, video data, caption data, data broadcast, etc. are generated. Then, the separation unit 13 outputs audio data to the audio decoding unit 14, outputs video data to the video decoding unit 15, outputs subtitle data to the subtitle processing unit 16, and outputs data broadcast to the data broadcast processing unit 17. To do. The EIT is output to the display update management unit 18. Here, EIT refers to program information of each service in terrestrial digital broadcasting, and includes a program genre, a start time, a continuation time, and the like.

  The audio decoding unit 14 receives the audio data from the separation unit 13, decodes the audio data, and outputs it to a speaker (not shown). The video decoding unit 15 receives the video data from the separation unit 13, decodes the video data for screen display, and outputs the decoded video data to the display unit 19. Further, an error at the time of decoding the video data is detected, and the video error is output to the display update management unit 18. The caption processing unit 16 receives the caption data from the separation unit 13, generates caption data for screen display, and outputs it to the display unit 19. In addition, an error in generating caption data is detected, and the caption error is output to the display update management unit 18. The data broadcast processing unit 17 receives the data broadcast from the separation unit 13, generates a data broadcast for screen display, and outputs it to the display unit 19. The data broadcast processing unit 17 processes a script included in the input data broadcast. Further, an error is detected when generating a data broadcast for screen display, and the data broadcast error is output to the display update management unit 18.

  The display update management unit 18 includes an EIT input from the separation unit 13, a decoding error input from the TV control unit 12, a video error input from the video decoding unit 15, and a subtitle input from the subtitle processing unit 16. Based on the error and the data broadcast error input from the data broadcast processing unit 17, the display update for the display unit 19 is managed and various display commands for screen display are output to the display unit 19.

  The display unit 19 displays video data for screen display from the video decoding unit 15, subtitle data for screen display from the subtitle processing unit 16, and data broadcast for screen display from the data broadcast processing unit 17, and the display update management unit 18. Various display commands for screen display are respectively input from the above, and based on the display commands, a screen image is created from the input video data, caption data, and data broadcast, and the screen image is displayed on the screen of the LCD 20.

  The control unit 11 performs processing for overall control of the broadcast receiving apparatus 1 such as outputting a frequency designation command indicating the timing for tuning the received RF signal to the TV control unit 12.

  FIG. 2 is a flowchart showing a procedure for not displaying video, subtitles, and data broadcasting when a service such as a program is switched. In terrestrial digital broadcasting, data broadcasting includes data called EIT, and the EIT data includes a program start time and a continuation time. Therefore, when the display update management unit 18 receives the EIT via the antenna 10, the TV control unit 12, and the separation unit 13 (step S21), the display update management unit 18 acquires the start time and the continuation time of the program from the EIT (step S22). Is calculated (step S23). Then, the display update management unit 18 checks whether or not the end time has come (step S24). If it is not the end time, the process proceeds to step 21. This end time is the timing for switching services such as programs.

  When the TV control unit 12 or the video decoding unit 15 detects a decoding error at the time of demodulation or decoding, an error in the received data, etc., and determines that the broadcast wave cannot be displayed normally, the error is updated. The data is output to the management unit 18. When an error is input from the TV control unit 12, the display update management unit 18 determines that an error is occurring. If an error is occurring and the end time of the program is reached (step S25), a display command for turning the currently displayed video, data broadcast, and subtitles into a blue background is output to the display unit 19. (Step S26). When a display command for blue back is input from the display update management unit 18, the display unit 19 changes the display on the LCD 20 to blue back. In this case, all displays of video, data broadcasting, and subtitles may be blue background, or at least one display may be blue background. Here, the display of the blue background means that the display data on the LCD 20 is erased so as not to be displayed on the screen.

  FIG. 3 is a flowchart showing a procedure for erasing video, subtitles, and data broadcasting, and a first display procedure after erasure in switching of services such as programs. Since each process of steps 31 to 36 shown in FIG. 3 is the same as each process of steps 21 to 26 shown in FIG. 2, the description thereof is omitted here. After the process of making the display on the LCD 20 blue background (step S36), the display update management unit 18 does not input an error from the video decoding unit 15, the subtitle processing unit 16 or the data broadcast processing unit 17, that is, video, subtitles. Alternatively, when the data broadcast is normally received, the display on the LCD 20 is not erased via the display unit 19 for each. That is, the display update management unit 18 displays the data received normally on the LCD 20 via the display unit 19. In this case, since the display of the data and the reproduction of the sound coincide with each other, it is possible to reduce discomfort given to the user after the service such as the program is switched.

  In step 36, the display update management unit 18 sets the display of the LCD 20 to blue back (after outputting a display command to make blue back), and then completely transmits the video data in the first key frame to the video decoding unit 15. Even if it cannot be received, a command for decoding and displaying the received macroblock is output. When the instruction is input, the video decoding unit 15 decodes the first received key frame (step S37) to the normally received macro block (step S38), and the display unit 19 displays the video up to the macro block. Is displayed on the LCD 20 (step S39). In this case, since the user can grasp the atmosphere of the program, it is possible to reduce discomfort given to the user after the service such as the program is switched.

  Here, the macroblock refers to information for each area when the original video data is divided into N × N areas. Video is encoded in units of macroblocks, and video is decoded in units of macroblocks.

  When the broadcast receiving apparatus 1 has received the key frame of the next program before the blue back process (step S36), the broadcast key receiving process 1 does not perform the blue back display process and receives the key frame received first. Of these, the macroblocks received normally may be decoded and displayed. After the blue-back process, video data that is not a key frame is not decoded and displayed, and is always decoded and displayed from the key frame.

  FIG. 4 is a flowchart showing a procedure for erasing video, subtitles, and data broadcasting, and a second display procedure after erasure when switching services such as programs. Since the processes in steps 41 to 47, 49-1, and 49-2 shown in FIG. 4 are the same as the processes in steps 31 to 39 shown in FIG. 3, the description thereof is omitted here. After the display update management unit 18 sets the display on the LCD 20 to blue back in step 46, the video update unit 15 decodes the received macroblock even if the video data cannot be completely received in the first key frame.・ Outputs a command to display. When the instruction is input, the video decoding unit 15 calculates the number of normally received macroblocks for the first received key frame (step S47), and the number is equal to or more than the preset M number. (Step S48), the macroblock received normally is decoded (step S49-1), and the display unit 19 displays the video up to the macroblock on the LCD 20 (step S49-2). When the numerical value is smaller than M, the video decoding unit 15 does not perform the decoding process, and the display unit 19 does not perform the display process. In this case, whether or not to display a video is determined based on the number of macroblocks that can be normally received, and is displayed in the case of M or more preset, so that the user can further understand the atmosphere of the program. It is possible to reduce discomfort given to the user after a service change such as a program.

  Note that the video decoding unit 15 may continue to wait for the key frame until the number of macro blocks of the key frame becomes M or more. Also, video data that is not a key frame is not decoded and displayed. If reception is possible in this state, the display unit 19 displays video, data broadcast, or subtitles.

  FIG. 5 is a flowchart showing a third display procedure after erasure of video, subtitles, and data broadcasting in switching of services such as programs. The display update management unit 18 outputs a subtitle display command to the display unit 19 when an error is not input from the subtitle processing unit 16 after the display of the LCD 20 is changed to a blue background via the display unit 19 (step S51). Then, the display unit 19 displays the caption instead of the video in the video display area (step S52). Further, the display update management unit 18 outputs a data broadcast display command to the display unit 19 when an error is not input from the data broadcast processing unit 17 after the display of the LCD 20 is blue-backed via the display unit 19. The display unit 19 displays the data broadcast instead of the video in the video display area. In this case, since the subtitles or the data broadcast that can be normally received are displayed, it is possible to reduce discomfort given to the user after the switching of services such as programs.

  Note that the broadcast receiving device 1 may not perform the blue back process when the subtitle data of the next program is received before the blue back process. In step 51, if an error is input from the caption processing unit 16, caption display is not performed. If reception is successful in this state, video, data broadcast, and subtitles are displayed on the LCD 20.

  FIG. 6 is a fourth flowchart after erasing video, subtitles, and data broadcasts when switching services such as programs. Since each process of steps 61 and 62 shown in FIG. 6 is the same as each process of steps 51 and 52 shown in FIG. 5, description thereof is omitted here. When the video decoding unit 15 can normally receive and decode the key frame of the video (step S63), the display update management unit 18 displays the subtitles via the display unit 19 when the subtitle is displayed. The displayed subtitle is displayed in a subtitle display area which is a place different from the video (step S64), and the video is displayed in the video display area (step S65). In this case, since the subtitle is not erased while reading the subtitle, it is possible to reduce discomfort given to the user after the service such as a program is switched.

  FIG. 8 is a diagram showing an example of screen display and audio reproduction corresponding to the flowchart of FIG. When an error that cannot be normally received / decoded occurs due to a poor reception state, the broadcast receiving apparatus 1 maintains the video that was last displayed before the error, and when the program is switched, the display is blue-backed to display the news. Erase the image. Then, the broadcast receiving apparatus 1 waits for the reception of the video key frame, and decodes and displays the received macro block even if the key frame is not normally received. Then, after receiving the key frame, the display of the video of the received macro block is left as it is until the key frame is normally received. In this case, similarly, after receiving the key frame, the received macro block may be decoded and displayed without receiving the key frame normally. Since the drama video is displayed by such display, it is possible to reduce discomfort caused by the fact that no video is displayed.

  FIG. 9 is a diagram showing an example of screen display and audio reproduction corresponding to the flowchart of FIG. When an error that cannot be normally received / decoded occurs due to a poor reception state, the broadcast receiving apparatus 1 displays captions in a video display area when it normally receives caption data. In this state, when receiving the key frame of the video, the broadcast receiving apparatus 1 displays the video in the video display area and displays the subtitles in another area. With such display, subtitles are displayed even if the drama video cannot be received, so that discomfort caused by the fact that no video is displayed can be reduced. Also, instead of erasing the subtitles along with the video display, the subtitles are displayed in a separate area, so users in the middle of reading the subtitles can continue to read the subtitles. Discomfort can be eliminated.

  The present invention has been described with reference to the embodiment. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit and intention of the present invention. For example, although the broadcast receiving apparatus 1 has been described as an example in the above embodiment, the present invention can also be applied to a mobile portable terminal apparatus.

  In the above embodiment, the display update management unit 18 acquires the program start time and continuation time from the EIT, calculates the program end time, and treats the end time as the program switching timing. The timing at which the video key frame is received may be handled as the program switching timing. Also, the timing at which caption data or data broadcast is received, that is, the timing at which data for screen display is generated without causing an error in the caption processing unit 16 or the data broadcast processing unit 17 is handled as the program switching timing. Also good.

It is a block diagram which shows the structure of the broadcast receiver by embodiment of this invention. It is a flowchart figure which shows the procedure which does not display an image | video, a caption, and data broadcasting. It is a flowchart figure which shows the procedure which erase | eliminates an image | video, a caption, and data broadcasting, and the 1st display procedure after erase | elimination. It is a flowchart figure which shows the 2nd display procedure after the procedure which erase | eliminates an image | video, a caption, and data broadcasting, and an erase. It is a flowchart figure which shows the 3rd display procedure after deletion of an image | video, a caption, and a data broadcast. It is a flowchart figure which shows the 4th display procedure after erasure | elimination of an image | video, a caption, and data broadcasting. It is a figure which shows the example of the screen display and audio | voice reproduction | regeneration in the conventional broadcast receiving apparatus. It is a figure which shows the example of the screen display and audio | voice reproduction | regeneration corresponding to the flowchart of FIG. It is a figure which shows the example of the screen display and audio | voice reproduction | regeneration corresponding to the flowchart of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Broadcast receiving apparatus 10 Antenna 11 Control part 12 TV control part 13 Separation part 14 Audio decoding part 15 Video decoding part 16 Subtitle processing part 17 Data broadcast processing part 18 Display update management part 19 Display part 20 LCD

Claims (10)

Broadcast receiving means for receiving a broadcast program;
Display means for displaying the received broadcast program;
When the timing of switching the broadcast program is detected and the next broadcast program cannot be correctly displayed at the timing, the display information of the previous broadcast program displayed on the display means is deleted after the timing of the switching. and control means for,
A broadcast receiving apparatus comprising: The broadcast receiving device according to claim 1,
A broadcast receiving apparatus characterized in that the display information to be erased is video, data broadcast or caption. The broadcast receiving device according to claim 1 or 2,
After the display information is erased, the control means displays the video when a key frame of the video is received, displays the subtitle when the subtitle is received, and displays the data broadcast when the data broadcast is received. A broadcast receiver characterized by displaying. The broadcast receiving device according to claim 1 or 2,
The broadcast receiving apparatus, wherein the control means displays a normal video macro block of a video key frame after erasing the display information. The broadcast receiving device according to claim 4,
The broadcast receiving apparatus characterized in that the control means calculates the number of normal video macroblocks and displays the normal video macroblocks based on the calculated number. The broadcast receiving device according to claim 1 or 2,
The broadcast receiving apparatus, wherein after the display information is erased, the control means displays the caption when the key frame of the video is abnormal and the caption is normal. The broadcast receiving apparatus according to claim 6, wherein
The control means calculates the number of normal video macroblocks after erasing the display information, the video keyframe is abnormal, the subtitles are normal, and the calculated value is equal to or less than a preset value In the case of the broadcast receiving apparatus, the subtitle is displayed. The broadcast receiving device according to claim 7,
The control means displays the video together with the caption when the control means receives a key frame of a normal video after displaying the caption. In the broadcast receiving device according to any one of claims 1 to 8,
The broadcast receiving apparatus, wherein the control means detects the switching timing of the broadcast program based on a program start time and duration included in an EIT (Event Information Table) of the received broadcast program. In a broadcast receiving method for receiving a broadcast program and displaying the program on the screen,
Detecting the switching timing of the received broadcast program;
When the next broadcast program cannot be correctly displayed at the timing, after the switching timing, erasing the display information of the previous broadcast program being displayed ;
A broadcast receiving method comprising:

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