JP2009159484A - Broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a broadcast receiver capable of efficiently and surely recognizing the content of a program broadcast by a digital broadcast in a short time. <P>SOLUTION: This broadcast receiver 100 including: reception parts 11 and 12 receiving a stream signal; a storage part 22 storing the received stream signal; a separation part 14 separating subtitle data from the stored stream signal; and a control part 10 controlling the separated subtitle data to be listed by being arranged in chronological order at a predetermined display speed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a broadcast receiving apparatus, and more particularly to a digital broadcast receiving apparatus capable of displaying a caption broadcast.

  In recent years, wireless communication terminals such as mobile phones have been widely used by a very large number of users. Recent mobile phones are equipped with various functions and applications such as a digital camera and GPS (Global Positioning System) position detection function on the terminal body. It has improved dramatically.

  In particular, recently, mobile phones equipped with a reception function for terrestrial digital television broadcasting (hereinafter referred to as digital broadcasting) using a one-segment partial reception service (hereinafter referred to as one-segment broadcasting) for mobile phones and mobile terminals have rapidly spread. I am doing. By using such a portable terminal that can watch digital broadcasting by receiving one-segment broadcasting, digital broadcasting can be performed within the area where broadcast waves reach, for example, even if it is moving, regardless of the viewing location. Can be viewed.

  Recently, portable terminals that can record received digital broadcasts by one-segment broadcasting in a memory (or memory card) built in the main body are already on the market. If such a portable terminal is used, even when the digital broadcast is in a state where the broadcast cannot be viewed due to the user's convenience, the broadcast of the program is terminated by recording the broadcast program. Even then, the program can be viewed later.

  Furthermore, a digital broadcast receiving apparatus capable of recording a received digital broadcast program on a recording medium such as a hard disk, which can be randomly accessed, as a digital signal is already on the market. Unlike a conventional case where an analog broadcast is recorded on a video cassette recorder (VCR), a digital broadcast receiving apparatus capable of recording using such a randomly accessible medium is different from a case where a program is recorded. Even during recording, a function to play back the recorded (currently broadcast) program so that it can be followed later by reading the recorded part from the media and playing it (hereinafter referred to as “chase playback”). There are things that can be realized. In the broadcast receiving device equipped with the function of chasing playback, while recording the program currently being broadcast one by one, the part that has already been recorded can be chased and paused, Some can also perform fast forward playback and rewind playback.

  In this way, when a program being recorded (currently being broadcast) is chased and played back, the playback speed is slightly faster than the normal speed, so that the program currently being broadcast (hereinafter, “ There is also a function that can be called “catch-up playback”. In the broadcast receiving apparatus having such a catch-up reproduction function, for example, as shown in the left half of FIG. 12, the video and audio are reproduced at a speed faster than the normal reproduction speed for the already recorded part. When catching up to the broadcast time of a program that is currently being recorded (broadcast) due to playback at a playback speed faster than normal, as shown in the right half of FIG. The program is switched to the playback of the currently broadcast program content.

  By using such a catch-up playback function, the recorded data can be played back without waiting for the end of the broadcast of the program being recorded (recording end), and when the catch-up playback catches up with the currently broadcast program In this case, the reproduction of the recorded data can be terminated and the user can view the program currently being broadcast in real time. Therefore, the catch-up playback function allows the user to view the program efficiently in time. In this catch-up playback, the playback speed of the voiced part of the sound is increased so much that the pitch (pitch) does not change much even if the playback speed is increased, or the silent part is omitted (packed). Various measures have been proposed, such as making it unnecessary.

  In addition, when playing back a recorded program, important or characteristic parts (highlight parts) in the program are played back at normal playback speed based on the highlight information of the broadcasted program, and other parts. Discloses a video playback apparatus that performs fast-forward playback and saves playback time as a whole (see, for example, Patent Document 1). According to this video playback device, based on the highlight information obtained separately from the video, the playback speed is slowed as the highlight portion approaches, and the playback speed is increased when the highlight portion is moved away, A large amount of video can be viewed efficiently and in a short time.

  By the way, in digital broadcasting, displaying various subtitles superimposed on the screen is standardized, and it has become possible to view broadcasts using subtitles without using special equipment. Yes. Digital analog subtitle broadcasts, unlike analog broadcast subtitle broadcasts, can be set to display / hide subtitles or select a desired subtitle from a plurality of provided subtitles on the terminal receiving the broadcast. is there. By using the caption management data, it is possible to operate the display format of individual captions on the receiving terminal side on the transmission side.

  Digital subtitle broadcasting is not only a program that displays subtitles that are translated into English, for example, what is spoken in English, as in conventional analog broadcasting. Many programs offer Japanese subtitles. By providing subtitles in such native language, not only the contents of the program can be grasped even by users with hearing impairments, but even in places where it is not desirable to make sound, such as public places, It is possible to fully grasp the program contents only by visually observing the screen without using an earphone or the like.

  Furthermore, in subtitle broadcasting of digital broadcasting, among stationary frequency receivers using 12 segments (high-definition broadcasting) out of the frequency bandwidth given to one channel, and for portable receiving terminals using one segment Are provided with different subtitles, each broadcasting different subtitle content and expression format.

  The digital broadcast caption function is roughly divided into a function related to a display mode and a function related to display control. Functions related to the display mode include format (vertical writing, horizontal writing, mixed), character type (kanji, kana, etc.), font designation, external characters, character size, character color (256 colors can be colored in units of characters), character attributes (inverted) , Flashing, underline, etc.), and display control functions include display timing, erase timing, cut, dissolve, and the like. In addition, it is possible to handle subtitles by expanding up to 8 languages per 1 ES (Elementary Stream). For details of digital terrestrial broadcasting caption broadcasting specifications, technical report of standard STD-B24 “Data broadcasting encoding method and transmission method in digital broadcasting” by ARIB (Association of Radio Industries and Broadcast) Since it is defined in TR-B14, a more detailed description is omitted.

  When playing back a program in which the above-mentioned caption information is also recorded, by displaying only this caption information, the user can follow the flow of the program, and depending on the program, the contents can be fully understood. is there. For this reason, for example, when there is no time to watch through a recorded program, or when it is desired to know only an outline centering on an important part of a program, only subtitles displayed in the program (without video and audio) As a result, the time required to grasp the contents of the program is remarkably reduced as compared with the case where the program is actually reproduced and viewed from the beginning to the end.

  Several proposals have already been made on the technology for controlling subtitles in digital broadcasting. For example, the video data and the caption data are separated from the video signal, the caption data is stored in the memory, the caption to be displayed is selected according to the operation signal from the operation means, and the caption data and the video data are displayed together. A video display device is disclosed (for example, see Patent Document 2). According to the video display device described in Patent Document 2, since the subtitle portion included in the digital broadcast can be operated independently of the video, only the display of the subtitle is performed regardless of the video and audio that progress at the normal playback speed. Can be paused, or the previous subtitle can be displayed by rewinding only the subtitle.

  Also proposed is a video processing device that captures the display of subtitles displayed on the screen as a still image together with the video and can sequentially store the still image each time the subtitle display is updated. (For example, see Patent Documents 3 and 4). According to these video processing apparatuses described in Patent Documents 3 and 4, by generating a plurality of still images including character information such as words spoken by characters in a program, “reading content” is generated. , The program contents can be grasped efficiently in time.

JP 2005-236527 A JP 2007-243292 A JP 2006-339817 A JP 2004-350167 A

  However, in the past, even when it is desired to watch the recorded part in a short time during program recording and grasp the contents, the playback speed is limited to about 1.5 times speed in order to listen to the sound. The above time cannot be shortened.

  Therefore, an object of the present invention made in view of such circumstances is to provide a broadcast receiving apparatus that can efficiently and reliably grasp the contents of a program broadcast by digital broadcasting in a short time.

The invention of the broadcast receiving apparatus according to claim 1 that achieves the above object is as follows:
A receiver for receiving the stream signal;
A storage unit for storing the stream signal received by the reception unit;
A separation unit that separates subtitle data from the stream signal stored in the storage unit;
A control unit that controls to display the subtitle data separated by the separation unit in a chronological order at a predetermined display speed;
It is characterized by having.

The invention according to claim 2 is the broadcast receiving apparatus according to claim 1,
When the control unit is in the chasing playback mode in which the stream signal received by the receiving unit is stored in the storage unit and the stream signal stored in the storage unit is played back, the stream stored by the separation unit After all the subtitle data separated from the signal is displayed, the stream signal received by the receiving unit is switched to real-time reproduction that directly reproduces the stream signal.

The invention according to claim 3 is the broadcast receiving apparatus according to claim 1,
The control unit, when instructed to end the list display control of the subtitle data, from the video data and audio data corresponding to the subtitle data displayed at the timing closest to the time when the end of the list display control is instructed The reproduction of the stored stream signal is started.

The invention according to claim 4 is the broadcast receiving apparatus according to any one of claims 1 to 3,
It further has an input unit that accepts external input,
The control unit blocks and displays only the separated subtitle data as continuous subtitle data based on the input from the input unit when performing reproduction to display only the subtitle data as continuous subtitle data It is characterized by controlling as follows.

The invention according to claim 5 is the broadcast receiving apparatus according to any one of claims 1 to 4,
The control unit analyzes a time interval between subtitle data displayed as continuous subtitle data based on the stream signal stored in the storage unit, and when the analyzed time interval is a predetermined time or more When displaying the subtitle data displayed as the continuous subtitle data, control is performed to display that the time interval exists.

  According to the present invention, when the stream signal received by the reception unit is reproduced while being stored, or when the stream signal received by the reception unit is reproduced after being stored, the stream signal is separated from the stored stream signal. Since caption data can be displayed, it is possible to perform chasing playback or catch-up playback using only captions. Therefore, the processing load and power consumption can be extremely reduced, and the contents of a program broadcast by digital broadcasting can be grasped efficiently and reliably in a short time.

  Embodiments of the present invention will be described below with reference to the drawings. In each of the following embodiments, description will be made assuming a portable terminal such as a mobile phone capable of receiving one-segment broadcasting as an example of the broadcast receiving device of the present invention. However, the broadcast receiving device of the present invention is a mobile phone. However, the present invention is not limited thereto, and can be applied to any portable digital broadcast receiver such as a PDA and a stationary television receiver. In addition, the present invention is not limited to one-segment broadcasting for digital broadcasting received by the broadcasting receiver, and can also be applied to a broadcasting receiver that receives full-segment broadcasting (HDTV).

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

  The broadcast receiving apparatus 100 is equipped with a television receiving function for viewing digital broadcasting by one-segment broadcasting, and includes a control unit 10 that controls the whole and a receiving unit that receives a broadcast wave of terrestrial digital broadcasting. A receiving antenna unit 11 and a tuner unit 12 are provided. The broadcast receiving apparatus 100 receives a broadcast wave of digital broadcasting with the antenna unit 11. The tuner unit 12 tunes a reception signal (RF signal) received by the antenna unit 11 based on a frequency (channel) designation command from the control unit 10. The demodulation unit 13 demodulates the broadcast wave tuned by the tuner unit 12 into a transport stream (TS) signal and supplies it to the separation unit 14. The separation unit 14 separates the demodulated TS signal into an audio packet, a video packet, a caption packet, and a data broadcast packet according to the packet ID. The audio packet separated from the TS signal by the demultiplexing unit 14 is input to the audio decoding unit 15, the video packet is input to the video decoding unit 16, the subtitle packet is input to the subtitle decoding unit 17, and the data broadcast packet is input to the data broadcast decoding unit 18. .

  The audio decoding unit 15 decodes the audio data in the input audio packet and outputs it to the speaker 19, and the speaker 19 outputs the audio output from the audio decoding unit 15. The video decoding unit 16 and the subtitle decoding unit 17 decode the input video data in the video packet and the subtitle data in the subtitle packet, respectively, and output them to the screen control unit 20. The data broadcast decoding unit 18 creates a screen image based on BML (Broadcast Markup Language) in the input data broadcast packet and outputs the screen image to the screen control unit 20. The screen control unit 20 displays a screen image based on the video, subtitle text, and BML output from the video decoding unit 16, the subtitle decoding unit 17, and the data broadcast decoding unit 18 based on a command from the control unit 10, respectively. 21. In this way, it is possible to view video with subtitles, data broadcast and audio of one-segment broadcasting. Since the normal operation of the receiving apparatus when viewing subtitle broadcasting and data broadcasting by one-segment broadcasting is a known technique, a more detailed description is omitted.

  The broadcast receiving apparatus 100 further includes a storage unit 22 for storing various types of information. The storage unit 22 is configured by a randomly accessible memory that functions as a work memory in addition to storing input information and various applications. To do. The storage unit 22 further includes a buffer 23 and a recording storage unit 24. When the broadcast receiving apparatus 100 starts the recording operation, the control unit 10 controls the storage unit 22 to store the data of the TS packet output from the demodulation unit 13. When TS packet data is stored in the storage unit 22, it is first stored in the buffer 23, which is a temporary storage area, and then stored in the recording storage unit 24. When playing back a recorded program, video and audio data are read from either the buffer 23 or the storage unit 24 in the storage unit 22. When subtitle data is accompanied, subtitle data is also read out. Since normal recording and playback operations for digital broadcasting are also known techniques, a more detailed description is omitted.

  The broadcast receiving apparatus 100 also includes a caption data detection unit that detects whether or not caption data is included in various data stored in the buffer 23 or the recording storage unit 24 that is an area in the storage unit 22. 25. Furthermore, the broadcast receiving apparatus 100 also includes an input unit 26 that accepts external input, and can accept key operations by the user. The input unit 26 can be configured by an arbitrary input device such as various operation keys or a touch panel.

  Next, the operation of chasing playback using subtitles according to the present embodiment will be described with reference to the flowchart of FIG. That is, the operation in the case where the reproduction is started before the recording of the program is completed during the recording of the currently broadcast digital broadcast program will be described.

  First, at the time when recording is started, the data of the TS packet that is output from the demodulation unit 13 is stored in the buffer 23 in the storage unit 22. In the chasing reproduction, the TS packet data in the buffer 23 is reproduced while the TS packet data is stored in the buffer 23.

  When the start of the chasing playback is instructed by an input from the input unit 26 by the user, the control unit 10 determines whether or not the chasing playback mode with only the caption is selected (step S11).

  When the chasing playback of only the caption is selected (Yes in Step S11), the caption data detection unit 25 determines whether or not the caption data is included in the TS packet stored in the buffer 23 (Step S12). ). Whether or not caption data is included in the TS packet can be determined, for example, by referring to the stream format identification in the PMT (Program Map Table) in the program arrangement information.

  When subtitle data is included in the TS packet stored in the buffer 23 (Yes in step S12), the control unit 10 decodes only subtitle data from the TS packet stored in the buffer 23 in the storage unit 22. The subtitle decoding unit 17 decodes the subtitle data and outputs the decoded subtitle data to the screen control unit 20 (step S13). The screen control unit 20 controls the decoded subtitle data to be displayed on the video display unit 21 (step S14). As a subtitle display method at the time of chasing playback (catch-up playback), settings are made so that subtitles are automatically displayed sequentially, or settings are made so that subtitle display proceeds based on user input to the input unit 26. Can be.

  In addition, when displaying the caption data on the video display unit 21, not only is the normal caption displayed on the video display unit 21 as usual, but in order to make it easier for the user to understand the program content, The color, character color, typeface, character thickness, shadow, brightness, contrast, sharpness, and other various parameters related to the character display form may be partially or combinedly displayed for display.

  Subsequently, the control unit 10 determines whether or not the chasing playback by subtitles has caught up with the currently broadcast program (step S15). That is, it is determined whether or not all the caption data stored in the buffer 23 has been displayed. When the subtitle data stored in the buffer 23 is completely displayed, that is, when the follow-up playback with subtitles catches up with the currently broadcast program (Yes in step S15), the control unit 10 Control is performed so that the broadcast data being received is switched to real-time reproduction for reproducing the broadcast data in real time (step S16).

  Note that if the user does not select the chasing playback mode with only subtitles in step S11, or if the TS packet stored in the buffer 23 does not include subtitle data in step S12, the control unit 10 Then, the audio decoding unit 15 and the video decoding unit 16 are controlled so as to decode the audio data and the video data included in the TS packet stored in the buffer 23 in the storage unit 22 (step S17). When the decoding of each data is completed, the control unit 10 outputs the decoded audio data to the speaker 19 and outputs the decoded video data to the screen control unit 21. The screen control unit 21 that has received the decoded video data displays the video data on the video display unit 21 (step S18). In this way, when the user desires chasing playback by video and audio, or when the program does not provide subtitle broadcasting, conventional chasing playback using video and audio is performed.

  In this way, for example, as shown on the left side of FIG. 3, in the section for chasing playback (catch-up playback), only the subtitles are displayed on the video display unit 21 and the program currently being broadcast is caught up. As shown on the right side of FIG. 3, by switching to real-time playback including video and audio, the user can quickly and efficiently grasp the contents of the program up to the location currently being broadcast. Further, in the chasing playback of only subtitles according to the present embodiment, since only subtitle data is decoded and displayed, there is no need to operate the audio decoding unit 15 and the video decoding unit 16 and the like, reducing processing load and saving power. Can be realized. In the case where the power consumption is more severely limited and the processing capability is lower than that of a stationary digital broadcast receiving apparatus, such as a portable terminal with a digital broadcast receiving function, the chasing playback of only subtitles according to this embodiment is particularly effective.

  When subtitles are displayed on the video display unit 21 during chasing playback with subtitles, it is preferable to scroll the subtitle data so that the user can easily understand the subtitles before and after and the flow of contents. In addition, when displaying on the video display unit 21 continuously with a time interval for each subtitle display unit, the subtitle display speed can be freely set based on the user input to the input unit 26. It is preferable to do this.

  Furthermore, by displaying subtitles for each display unit based on a user input operation to the input unit 26, when the user reads the subtitle display unit, the next subtitle display unit is displayed. Also good.

  Hereinafter, an example of an operation of switching the display of subtitles by a user operation at the time of chasing playback using subtitles according to the present embodiment will be described with reference to the flowchart of FIG.

  First, the screen control unit 20 controls the video display unit 21 to display a display unit of subtitles among the subtitle data decoded by the subtitle decoding unit 17 (step S21).

  Next, the control unit 10 determines whether or not subtitle data to be displayed next exists in the buffer 23 of the storage unit 22 (step S22). When subtitle data to be displayed next does not exist in the buffer 23, the chasing playback using the subtitle ends. When subtitle data to be displayed next exists in the buffer 23, the control unit 10 determines whether or not an area for displaying the subtitle data exists in the video display unit 21 (step S23).

  If there is still an area for displaying the caption data to be displayed next, the process returns to step S21, and the next caption is additionally displayed in the downward direction or the like of the currently displayed caption. Display as many subtitles as possible. As a result of displaying the subtitles in sequence, if the area for displaying the subtitle data to be displayed next is insufficient in step S23, the control unit 10 stops the display of the next subtitle at that time and inputs it. It is determined whether or not there has been an instruction to switch the screen by a user input to the unit 26 (step S24). Until this user instruction is given, the control unit 10 controls the video display unit 21 to hold the display of the current caption.

  If there is an instruction to switch the screen by the user input to the input unit 26 in step S24, the control unit 10 clears all the caption data currently displayed on the video display unit 21 (step S25), and then step S21. The next subtitle is displayed again.

  For example, as shown in FIGS. 5A to 5B, subtitles are sequentially displayed until there is no area for displaying subtitles on the video display unit 21, but no more subtitles are displayed as shown in FIG. 5B. When there are no more spaces (lines) to display, no more subtitles are displayed. After that, the next (continuous) subtitle is displayed as shown in FIG. 5C only when there is an instruction to switch the screen by an input to the input unit 26 by the user.

  Therefore, it is possible to prevent a situation in which the subtitle is erased or scrolled to flow outside the screen before the user completely reads the subtitle. In chasing playback, the display speed of subtitles is faster than normal playback, and it is assumed that subtitles are overlooked. Therefore, such a measure is very effective. In addition, as a result, the user can perform chasing playback (catch-up playback) at his / her own pace, so the degree of freedom in viewing style is also improved. In addition to the display method in which new subtitles are added sequentially from the top of the screen in the downward direction as described above, the subtitles are displayed from the bottom of the screen, and the subtitles are sequentially scrolled up by one line. Thus, various display modes such as a display method in which new subtitles are inserted under the subtitles can be assumed.

  In addition, as described above, when subtitles are displayed sequentially on the same screen, there is a merit that the contents of the program can be grasped efficiently and quickly, but the time transition is difficult to grasp because the time is viewed. Is also envisaged. If there is a relatively large time interval between the subtitles being displayed, if this is not understood, there may be a problem in grasping the content in the course of the program.

  Therefore, in the present embodiment, if a large time interval is available between subtitles during chasing playback using subtitles, this is notified to the user as necessary.

  With reference to FIG. 6, the display timing and erasure timing of each subtitle in a broadcast program will be described. Here, for the sake of simplicity, the subtitle A first displays the subtitle “Please tell me when you are ready.” And then erases it, and then the subtitle B displays the subtitle “I ’m still going to take it. It is assumed that the display is erased after being displayed. The timing at which the caption A is displayed is defined as “subtitle A display timing TA1”, and the timing at which the caption A is erased is defined as “subtitle A erasing timing TA2.” Similarly, the timing at which caption B is displayed is defined as “subtitle B display timing TB1”, and the timing at which caption B is erased is defined as “subtitle B erasing timing TB2”. The time from TA2 when subtitle A as the previous subtitle is erased to TB1 when subtitle B as the next subtitle is displayed is defined as “subtitle display interval”.

  These subtitle display and erasure timings are transmitted together with subtitle data as subtitle control information of subtitle broadcast in digital broadcasting, and the screen control unit 20 superimposes subtitles on the video data according to the subtitle control information. Or the subtitles are deleted from the video data. In addition, the subtitle display and erasure timing may be transmitted by being included in the TS packet at the timing of actual display or the timing of erasure. Sometimes it comes.

  Next, an operation for notifying the user when the caption display interval is equal to or greater than a certain value will be described with reference to the flowchart of FIG. Here, as an example, a case will be described in which subtitle display and erasure timing is included in a TS packet and transmitted at the timing to be actually displayed or to be erased.

  First, it is assumed that a chasing playback operation using subtitles according to the present embodiment is performed at the start of this operation. When the control unit 10 detects TA1 that is the display timing of the subtitle A in the subtitle data included in the data of the TS packet demodulated by the demodulating unit 13 (step S31), the control unit 10 selects the subtitle A based on the subtitle display timing. The image is displayed on the video display unit 21 (step S32).

  Next, when the control unit 10 detects TA2 that is the erasure timing of the caption A in the caption data (step S33), the control unit 10 stores the caption erasure timing in the buffer 23 of the storage unit 22. After that, when detecting the TB1 that is the display timing of the caption B (step S34), the control unit 10 calculates the difference between this TB1 and the TA2 stored in the buffer 23, and whether the difference exceeds a predetermined threshold value. It is determined whether or not (step S35). Depending on the program data structure, the display timing TA1 and the erasure timing TA2 of the caption A may be notified at the same time. In this case, when TA2 is detected (at the same time as TA1), it is stored in the buffer 23 of the storage unit 22, the caption A is displayed first, and then the caption B display timing TB1 is detected. The subtitle display interval is calculated using TA2 stored in advance.

  In step S35, if the difference between TB1 and TA2 exceeds a predetermined threshold value, the control unit 10 determines that the time interval is free and / or the time interval freed during actual playback as the caption A. The video display unit 21 is controlled to display after (step S36). If this predetermined threshold is set too small, a display indicating that the time interval is free is frequently displayed, so that it is useful to inform the user that the time interval is free. To set. Thereafter, the video display unit 21 displays the subtitle B continuously after the display (step S37). When the display area of the video display unit 21 is filled with subtitles, all the pages may be cleared once and new subtitles may be displayed, or the subtitles on the screen filled with subtitles may be scrolled. You can also display the next subtitle. The scrolling method may be line scrolling or page scrolling.

  By doing so, it is possible to notify the user when the display interval of captions is longer than a certain distance in a program that is actually broadcast. For example, during subtitle playback according to the present embodiment, subtitles are sequentially displayed on the video display unit 21 as shown in (A) to (B) of FIG. However, as shown in the center of the screen in FIG. 8B, it can be seen at a glance that there is a 30-second subtitle space in this part in actual broadcasting. In addition to displaying the time value of the subtitle display interval described above, the display to notify the user in this way displays, for example, a symbol or a symbol mark indicating that the subtitle display interval is free, or a display By displaying the subtitle B immediately after the interval itself is not displayed, the user can be informed that the subtitle display interval is available. Therefore, the user can easily grasp that the subtitle display interval is more than a certain amount due to scene changes or CMs in the program during this period, and depending on the content of the program, the user has a big clue that makes it easier to grasp the content of the program. Obtainable.

(Second Embodiment)
Next, a reproduction operation using subtitles according to the second embodiment will be described. In the second embodiment, in the first embodiment described above, fast-forward playback using only subtitles is performed when a recorded program is played back after recording of the program is completed, not during follow-up playback.

  This embodiment can be implemented by the same broadcast receiving apparatus 100 as the first embodiment. Also, the operation of the present embodiment is performed by substantially the same operation as that of the first embodiment. However, since the recorded data to be reproduced is data that has been recorded, the recording / storage unit 24 is not the buffer 23 but 1 It is stored as one recording file.

  Next, with reference to the flowchart of FIG. 9, an operation of fast-forward playback of only a subtitle of a program that has been recorded according to the present embodiment will be described.

  First, at the time when recording is started, the data of the TS packet that is output from the demodulation unit 13 is stored in the buffer 23 in the storage unit 22. After the recording of the program is completed, the data stored in the buffer 23 is stored in the recording storage unit 24 as one recording file.

  When the start of fast-forward playback of a recorded program is instructed by an input from the input unit 26 by the user, the control unit 10 determines whether or not a fast-forward playback mode with only captions is selected (step S41).

  When fast-forward playback of only subtitles is selected (Yes in step S41), the subtitle data detection unit 25 determines whether subtitle data is included in the TS packet to be played back stored in the recording storage unit 24. Determination is made (step S42). Whether or not caption data is included in the TS packet can be determined, for example, by referring to the stream format identification in the PMT (Program Map Table) in the program arrangement information.

  When subtitle data is included in the TS packet stored in the recording and accumulating unit 24 (Yes in step S42), the control unit 10 subtitles data from the TS packet stored in the recording and accumulating unit 24 in the storage unit 22. The subtitle decoding unit 17 decodes the subtitle data and outputs it to the screen control unit 20 (step S43). The screen control unit 20 controls the decoded subtitle data to be displayed on the video display unit 21 (step S44). The subtitle display method during the fast-forward playback is also set so that the subtitles are automatically displayed sequentially or set so that the subtitle display proceeds based on the user input to the input unit 26. Can do.

  In addition, when displaying the caption data on the video display unit 21, not only is the normal caption displayed on the video display unit 21 as usual, but in order to make it easier for the user to understand the program content, The color, character color, typeface, character thickness, shadow, brightness, contrast, sharpness, and other various parameters related to the character display form may be partially or combinedly displayed for display.

  Subsequently, the control unit 10 determines whether or not fast-forward playback by subtitles has been canceled (step S45). When reproduction by fast-forward reproduction by subtitles is canceled in step S45 (Yes in step S45), the control unit 10 controls to switch to normal video and audio reproduction (step S46).

  If the user does not select the fast-forward playback mode with only captions in step S41, or if the TS packet stored in the recording storage unit 24 does not contain caption data in step S42, the control unit 10 controls the audio decoding unit 15 and the video decoding unit 16 to decode the audio data and the video data included in the TS packet stored in the recording / accumulating unit 24 in the storage unit 22 (step S47). When the decoding of each data is completed, the control unit 10 outputs the decoded audio data to the speaker 19 and outputs the decoded video data to the screen control unit 21. The screen control unit 21 that has received the decoded video data displays the video data on the video display unit 21 (step S48). In this way, when the user desires fast-forward playback using video and audio, or when the program does not provide subtitle broadcasting, fast-forward playback using normal video and audio is performed.

  In step S46, when switching from fast-forward playback with only subtitles to normal video and audio playback, video data and audio data corresponding to a character string once displayed with subtitles do not flow redundantly. It is preferable to do so. Hereinafter, with reference to FIG. 10, an example of the operation at the time of switching from fast-forward reproduction of only captions to normal video and audio reproduction in step 46 of FIG. 9 will be described in detail.

  When the reproduction of displaying only subtitle data as continuous subtitle data is canceled, the control unit 10 detects the subtitle currently displayed on the video display unit 21 (step S51). Next, the control unit 10 searches the recording / storage unit 24 for video data and audio data corresponding to the detected currently displayed subtitle (step S52). When the video data and audio data corresponding to the currently displayed caption are found, the control unit 10 reproduces the video data and audio data next to the video data and audio data (step S53). In this way, by playing back video and audio from the point at which fast-forward playback with characters is completed, when switching from fast-forward playback with only subtitles to normal playback, the displayed subtitles and audio are not duplicated. Switching can be performed.

  Further, in the present embodiment, the operation described in the first embodiment for switching the display of subtitles by the user operation and the operation for notifying the user when the subtitle display interval is greater than or equal to a certain value may be performed in combination. it can.

  By doing so, the broadcast receiving apparatus 100 starts fast-forward playback at a faster speed than normal playback during normal video and audio playback, for example, as shown on the left side of FIG. As shown in the upper side of FIG. 11, only captions are continuously displayed on the video display unit 21. When fast-forward playback of only subtitles is canceled, normal video and audio playback is continuously performed without duplication from the point when fast-forward playback of only subtitles is completed, as shown on the right side of FIG. Therefore, it is possible to quickly and efficiently grasp the contents of a program by combining normal video and audio playback and fast-forward playback using only captions. Further, even in the fast-forward playback of only the subtitle according to the present embodiment, it is only necessary to decode and display the subtitle data. Therefore, it is not necessary to operate the audio decoding unit 15 and the video decoding unit 16, and the processing load is reduced and saved. Electricity can be realized.

  In addition, this invention is not limited only to each embodiment mentioned above, Many deformation | transformation or a change is possible. For example, in the first embodiment, when it is determined in step S15 whether or not the chasing playback by subtitles has caught up with the program currently being broadcast, the time information and the current time of the subtitle data currently being played back are obtained. It can also be done by comparison.

  Further, in each of the embodiments described above, it is assumed that all subtitles flowing during the program broadcast are displayed, but depending on the speed of chasing playback (catch-up playback) or fast-forward playback, or According to the user's desire, characters that are considered unnecessary in the subtitles are discriminated, so that these can be removed and displayed as continuous subtitle data for viewing. For example, “♪ (note mark)” that is displayed when sound effects and music are played is registered in advance, and all such characters are omitted, followed by chasing playback of subtitles only (catch-up playback) or fast-forwarding By playing, subtitles can be displayed and viewed more efficiently.

It is a functional block diagram which shows schematic structure of the mobile telephone which concerns on 1st Embodiment. It is a flowchart explaining the operation | movement of the chase reproduction | regeneration by a caption based on 1st Embodiment. It is a conceptual diagram explaining the operation | movement of the chase reproduction | regeneration by a caption based on 1st Embodiment. It is a flowchart explaining the operation | movement which switches the display of the subtitle by user operation based on 1st Embodiment. It is a figure which shows the example of a display screen of switching operation | movement of the subtitle display by user operation based on 1st Embodiment. It is a figure explaining the display timing and the erasing timing of each caption concerning a 1st embodiment. It is a flowchart explaining the operation | movement notified to a user when a subtitle display space | interval is more than fixed according to 1st Embodiment. It is a figure which shows the example of a display screen of the operation | movement notified to a user when a subtitle display space | interval is more than fixed according to 1st Embodiment. It is a flowchart explaining the reproduction | regeneration operation | movement by the subtitle after the program recording based on 2nd Embodiment. It is a flowchart explaining the operation | movement when the reproduction | regeneration by the subtitles after program recording based on 2nd Embodiment is cancelled | released. It is a conceptual diagram explaining the reproduction | regeneration operation | movement by the subtitles after program recording based on 2nd Embodiment. It is a conceptual diagram explaining conventional chasing playback and catch-up playback.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Control part 11 Antenna part 12 Tuner part 13 Demodulation part 14 Separation part 15 Audio decoding part 16 Video decoding part 17 Subtitle decoding part 18 Data broadcast decoding part 19 Speaker 20 Screen control part 21 Video display part 22 Storage part 23 Buffer 24 Recording accumulation Unit 25 subtitle data detection unit 26 input unit 100 broadcast receiving apparatus

Claims (5)

A receiver for receiving the stream signal;
A storage unit for storing the stream signal received by the reception unit;
A separation unit that separates subtitle data from the stream signal stored in the storage unit;
A control unit that controls to display the subtitle data separated by the separation unit in a chronological order at a predetermined display speed;
A broadcast receiving apparatus comprising:   When the control unit is in the chasing playback mode in which the stream signal received by the receiving unit is stored in the storage unit and the stream signal stored in the storage unit is played back, the stream stored by the separation unit The broadcast receiving apparatus according to claim 1, wherein after displaying all the caption data separated from the signal, the broadcast receiving apparatus is switched to a real-time reproduction in which the stream signal received by the receiving unit is directly reproduced.   The control unit, when instructed to end the list display control of the subtitle data, from the video data and audio data corresponding to the subtitle data displayed at the timing closest to the time when the end of the list display control is instructed The broadcast receiving apparatus according to claim 1, wherein reproduction of the stored stream signal is started. It further has an input unit that accepts external input,
The control unit blocks and displays only the separated subtitle data as continuous subtitle data based on the input from the input unit when performing reproduction to display only the subtitle data as continuous subtitle data The broadcast receiving apparatus according to claim 1, wherein the broadcast receiving apparatus is controlled as follows.   The control unit analyzes a time interval between subtitle data displayed as continuous subtitle data based on the stream signal stored in the storage unit, and when the analyzed time interval is a predetermined time or more 5. When displaying subtitle data displayed as the continuous subtitle data, control is performed so as to display that the time interval exists. Broadcast receiver.

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