JP2009206724A - Playback device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a playback device capable of efficiently playback contents of a content such as videos with little processing load in a short period of time. <P>SOLUTION: The playback device 100 includes receiving parts 11 and 12 for receiving a stream signal, a storing part 22 for storing the stream signal received by the receiving parts, a separating part 14 for separating caption data from the stream signal stored in the storing part, and playback control parts 10 and 20 to output only the caption data separated from the stream signal by the separating part 14 when playing back the stream signal in a direction reverse from a normal playback direction and performing rewinding playback. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a playback device, and more particularly to a playback device capable of playing back video content including subtitles.

  In recent years, mobile terminals having a wireless communication function such as mobile phones have been widely used by a great number of users. Recent mobile phones are equipped with various functional units and applications such as a position detection function by a digital camera or a GPS (Global Positioning System), for example, in a terminal body, and are becoming more and more multifunctional. With such a mobile phone, convenience for the user is greatly improved.

  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 receive one-segment broadcasting and reproduce digital broadcasting, the user can view the digital broadcasting regardless of the viewing location within the area where the broadcast wave reaches.

  In digital broadcasting, displaying various subtitles superimposed on the screen is standardized as a standard function, so that broadcasts using subtitles can be viewed without using special equipment. 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.

  In subtitle broadcasting in digital broadcasting, for example, not only programs that display English subtitles translated into Japanese, but also content that is spoken in Japanese, for example, as in conventional analog broadcasting Many programs offer Japanese subtitles. By providing such native language subtitles, even users with hearing impairments can grasp the program content. In addition, subtitle broadcasting makes it possible to fully understand the program contents only by visually observing the screen without using earphones, for example, in places where it is not desirable to make sound, such as public places.

  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 Will provide different subtitles. These subtitle broadcasts are provided with different subtitle contents and expression formats.

  The digital broadcasting subtitle 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) , Flushing, underline, etc.). Further, functions related to display control include display timing, erasing timing, cut, dissolve, and the like. Furthermore, it is possible to handle subtitles by expanding up to 8 languages per 1 ES (Elementary Stream).

  The specifications of digital terrestrial broadcasting subtitle broadcasting are as follows: Technical report TR- of standard STD-B24 “Data broadcasting encoding method and transmission system in digital broadcasting” by ARIB (Association of Radio Industries and Broadcast) It is specified in B14. For this reason, a more detailed description is omitted.

  Recently, portable terminals that can record received digital broadcasts by one-segment broadcasting in a memory (or a memory card or the like) built in the main body are already on the market. If such a portable terminal is used, the user can play back and watch the recorded program later even if the program cannot be viewed during the broadcast of the digital broadcast.

  Recently, it has become common to play back a digital broadcast recorded on a mobile terminal or a content downloaded from a mobile terminal such as video or music. As described above, in a mobile terminal typified by a recent mobile phone, in addition to the original function such as a telephone function, a function as a content reproduction apparatus is one of the main functions.

  Furthermore, content playback apparatuses that can record received digital broadcast programs on a randomly accessible recording medium such as a hard disk as digital signals are already on the market. In such a content playback device, even if the recording of the program has not yet ended, the recorded part is read from the medium and played back, and the program being recorded (currently broadcast) is followed later. Some of them can be “chased”. In a content playback device equipped with a chasing playback function, the program that is currently being broadcast is recorded sequentially one after another, and the part that has already been recorded can be chased, paused, or fast-forwarded. Playback and rewind playback are also possible.

  In this way, when a program that is being recorded (currently being broadcast) is chased and played back, the playback speed is slightly faster than the normal speed, so that the program that catches up with the program that is currently being broadcast is played back. Some can do. In a playback apparatus equipped with such a catch-up playback function, video and audio are played back at a speed faster than the normal playback speed for a portion that has already been recorded. When the program is currently being played back, if the current point in time of the program being recorded (broadcasting) is caught up, the program is switched to the reproduction of the program currently being recorded, that is, the program currently being broadcast. .

  With such a catch-up reproduction function, a recorded program can be reproduced without waiting for the broadcast of the program being recorded to end (recording end). Furthermore, when the catch-up reproduction catches up with the program currently being broadcast, the reproduction of the recorded program is terminated and the program currently being broadcast can be reproduced in real time. Therefore, the catch-up playback function allows the user to view the program efficiently in time. In this catch-up playback, various measures have been proposed that allow the user to understand the content to be played back even when the playback speed is higher than normal. For example, for audio that is being caught up, the playback speed of the voiced part is not increased much by making the pitch (pitch) not change much even if the playback speed is increased, or by omitting (packing) the silent part. You can

  When the above-described portable terminal is used as a playback device and a recorded program such as a digital broadcast or a downloaded video content is played back, it is almost the same as when a conventional analog broadcast is recorded and played back on a video cassette recorder (VCR). Playback control. That is, in addition to normal playback of video content and the like, various playbacks such as playback pause, fast forward playback, and rewind playback can be arbitrarily performed by the user.

  In such a playback device, when the playback of content or the like that was previously viewed is interrupted in the middle and the playback is resumed from the playback interrupt location, the user wants to know the program content a little before the playback interrupt location. There is a case. Also, the same request can be generated when a program that has not been played back during recording is played back and viewed from the middle. In that case, based on the user's operation, the content is generally rewound by a necessary amount and then played (chase playback when recording).

  For example, as shown in FIG. 8, it is assumed that a certain video content is played in the order of scene A, scene B, scene C, and scene D in the normal playback direction. When the previous reproduction is stopped immediately before the scene C, the reproduction starts from the scene C when the reproduction is resumed. When playback of the scene C is started, if the user cannot grasp the connection between the scene C and the immediately preceding scene, the user performs rewind playback (1. rewind playback in FIG. 8) a little before. Do. The same applies to the case where a program that has not been played back during recording is chased and played back from the middle, and that playback is started from scene C.

  When rewinding playback from the scene C back to the scene A, the video is generally reversely played back at a faster speed than the normal playback, and the sound is generally silent. During the rewind playback, the user may be able to grasp the outline of the video portion of the content by the video that is played back at high speed in the reverse direction. However, it is difficult to grasp the flow of the program contents because the playback is reverse to normal. In addition, it is impossible to grasp details such as scene descriptions and character lines.

  For the user, the meaning of the rewind playback is merely used as a reference for finding a location where the rewind playback is ended, that is, a location where normal playback is resumed from a scene to be viewed. Therefore, the reproduction is meaningful for the user only after the end of the rewind reproduction and the resumption of reproduction (2. Reproduction in FIG. 8). The user resumes playback from the scene A after the end of the rewind playback, performs normal playback from the scene A, and grasps the content connection with the time when the rewind playback is started only after viewing the scene C. it can. If the user can grasp the flow of the program content up to that time smoothly, the user can continue to watch without feeling uncomfortable thereafter.

  When such rewind playback is performed, in the case of content including the above-described subtitles, the user can follow the program flow by displaying the subtitles and performing rewind playback. Full details can be grasped. For example, subtitle information displayed in a program is particularly effective when it is desired to quickly understand the contents of a program or content, or when it is desired to know only an outline centering on an important part of a program. By using subtitles in this way, it is possible to grasp the viewing time and the content of the program compared to the case of rewinding and resuming the program and watching it with video and audio until the start of the rewinding. The time required is significantly reduced.

  Several proposals have already been made on techniques for controlling the display of captions in digital broadcasting. For example, there is a technology that reads past subtitles retroactive from the present by the number of times of instructing the rewinding of subtitle display from the subtitle storage means and displays the subtitles in combination with a still image that is played back when the subtitle rewinding is instructed. It is disclosed (for example, see Patent Document 1). According to the playback device described in Patent Document 1, when displaying the rewinded subtitles on the display unit, the subtitles are displayed for a longer time than during normal playback. , You can redisplay missed subtitles.

  Also, 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 technique is disclosed (for example, see Patent Document 2). According to the video display device described in Patent Literature 2, the subtitle portion included in the digital broadcast can be operated independently of the video. Therefore, regardless of the video and audio progressing at the normal playback speed, only the subtitle display can be paused or the previous subtitle can be displayed by rewinding only the subtitle.

  Furthermore, a technique has been proposed in which subtitle display displayed on the screen is captured as a still image together with video, and such a still image can be sequentially stored each time the subtitle display is updated (for example, Patent Documents). 3). According to the video processing apparatus described in Patent Document 3, by creating a plurality of still images including character information such as words spoken by characters in a program, program content can be generated by generating “read content” Can be grasped efficiently in time.

JP 2004-213832 A JP 2007-243292 A JP 2004-350167 A

  However, since all of the techniques described in the above-mentioned patent documents process subtitles as an image superimposed with some video such as a still image of a certain scene, there is a concern that the load necessary for the processing becomes high. Such processing with a high processing load is not desirable in a terminal where resources available for processing are limited, such as a portable terminal. The high processing load on the terminal generally means that the power consumption required for the processing also increases, especially in the case of a terminal that operates on a rechargeable battery, such as a portable terminal, Need to be reduced.

  In addition, when displaying subtitles when performing rewind playback, the subtitles are naturally displayed in the reverse direction to normal playback, that is, in the order that goes back in time in the past. For this reason, even if subtitles are displayed during rewind playback, there is a problem that it is difficult for the user to interpret and understand the contents of the program. For example, in the techniques described in the above-mentioned Japanese Patent Laid-Open Nos. 1 to 3, the displayed subtitles can be rewound in units of subtitles. However, since each subtitle is displayed individually, the program contents are also displayed. Need to be interpreted and understood in the past direction. Therefore, it is not always easy to grasp the continuity of program contents. In addition, since the image at the time when the rewind is instructed and the caption displayed by the rewind are combined, the content of the video and the caption may not match. In this case, the video does not help the user grasp the contents.

  Furthermore, if the user can grasp the contents of the program during rewind playback, when rewind playback is terminated and normal playback is started, playback from that point to the time when rewind playback is started is already known. Will play the content again. If it is determined that it is not necessary to reproduce the content that has already been understood, it is assumed that the user performs fast forward reproduction until the start of rewind reproduction. However, in order to perform fast forward playback up to the point where rewind playback is started, the rewind playback start position must be remembered in advance.

  Accordingly, an object of the present invention made in view of such circumstances is to provide a playback apparatus capable of efficiently playing back the content of video and other content with a small processing load.

The invention of the playback 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 reproduction control unit that outputs only the caption data separated from the stream signal by the separation unit when reproducing the stream signal in a direction opposite to the normal reproduction direction and performing rewind reproduction;
It is characterized by providing.

The invention according to claim 2 is the playback apparatus according to claim 1,
An instruction unit for instructing rewind reproduction of the stream signal by the reproduction control unit;
When the instruction unit instructs to rewind the stream signal during the reproduction of the stream signal, the reproduction control unit indicates the position where the instruction unit instructs the rewind reproduction of the stream signal. When the rewind playback of the stream signal is performed and the stop of the rewind playback of the stream signal is instructed by the instruction unit, the position of the rewind playback stored in the storage unit is instructed. From the above, it is controlled to resume the reproduction of the stream signal.

  According to the present invention, when the stream signal is reproduced in the direction opposite to the normal reproduction direction and is rewound, only the caption data separated from the stream signal by the separation unit can be output to display the caption. Therefore, the content of video and other content can be reproduced efficiently in a short time with a very small processing load.

  Embodiments of the present invention will be described below with reference to the drawings. In each of the following embodiments, a description will be given assuming a mobile terminal such as a mobile phone capable of receiving one-segment broadcasting as an example of the playback device of the present invention. However, the playback device of the present invention is limited to a mobile phone. For example, the present invention 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 the one-segment broadcasting for digital broadcasting received by the broadcasting receiver, but 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 playback apparatus according to the first embodiment of the present invention.

  The playback device 100 is equipped with a television receiving function for playing back digital broadcasts by one-segment broadcasting, and is used for broadcast reception that constitutes a control unit 10 that controls the whole and a receiving unit that receives broadcast waves of digital terrestrial broadcasting. The antenna unit 11 and the tuner unit 12 are included. The playback apparatus 100 receives a broadcast wave of digital broadcasting at 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 video data in the input video packet and the subtitle data in the subtitle packet, respectively, and output them to the display 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 display control unit 20.

  The display control unit 20 displays a screen image based on video, subtitle text, and BML respectively 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. 21. In this manner, the one-segment broadcasting video with subtitles, data broadcasting and audio are reproduced. Therefore, in the present embodiment, the reproduction control unit is configured including the control unit 10 and the display control unit 20. Note that the normal operation of the receiving apparatus when reproducing subtitle broadcast and data broadcast by one-segment broadcasting is a known technique, and thus a more detailed description is omitted.

  The playback apparatus 100 further includes a storage unit 22 that stores 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. The storage unit 22 further includes a buffer 23 and a recording storage unit 24.

  When the playback device 100 starts the recording operation, the control unit 10 controls the storage unit 22 to store the TS packet data 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 of digital broadcasting are also known techniques, a more detailed description is omitted.

  The playback apparatus 100 also includes a caption data detection unit 25 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. It has. Furthermore, the playback device 100 also includes an input unit 26 that receives external input, and receives 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, with reference to the flowchart of FIG. 2, the operation of rewind playback by subtitles by the playback device 100 of the present embodiment will be described. In the following description, a case where video content data recording a program or the like is stored in the recording / accumulating unit 24 of the storage unit 22 in advance will be described.

  In the present embodiment, first, the control unit 10 reads and decodes the video content data stored in the recording / accumulating unit 24 and controls the video and audio to be output from the video display unit 21 and the speaker 19. The video content is being played back.

  In this way, during the playback of the video content, the rewind playback operation shown in FIG. 2 starts from the point in time when the start of the rewind playback is instructed by the input from the input unit 26 by the user. Therefore, in the present embodiment, the input unit 26 constitutes an instruction unit.

  When a rewind playback instruction is given from the input unit 26, the control unit 10 determines whether or not the instructed rewind playback is a rewind playback by subtitle (step S11). The instruction for rewind playback by subtitle is performed by providing a dedicated key different from that for normal rewind playback at the input unit 26, or after performing normal rewind playback, by performing a predetermined additional operation to rewind by subtitle. Various modes are conceivable, such as selection of reverse playback.

  When the rewind playback by subtitle is selected (Yes in step S11), the subtitle data detection unit 25 determines whether subtitle data is included in the TS packet stored in the recording storage unit 24 (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 recording / storage unit 24 (Yes in step S12), the control unit 10 controls to decode only the subtitle data from the TS packet in the recording / storage unit 24. At the same time, the control unit 10 outputs only the caption data and performs rewind playback. At this time, the control unit 10 does not output video and audio, but outputs only the decoded caption data in units of caption display based on the timing of TS packet data rewind playback. The display control unit 20 displays subtitles based on the subtitle data output by the rewind reproduction on the video display unit 21 (step S13). In addition, when the rewind reproduction | regeneration by subtitles is started, the control part 10 memorize | stores the information regarding the position of the content at the time of starting the rewind reproduction | regeneration in the memory | storage part 22. FIG.

  When displaying subtitles on the video display unit 21, the display control unit 20 displays the subtitles in the order from the bottom to the top of the video display unit 21 so that the user can read the subtitles in the order of normal playback. Display subtitles. When the display is filled up to the upper end of the video display unit 21, it is preferable to scroll down the entire caption display line by line as the caption is additionally displayed on the top line. As another mode, when the display is filled up to the upper end of the video display unit 21, all the subtitle display is once cleared, and a mode of newly displaying from the lowermost part is also conceivable. The subtitle display at this time can be cleared automatically based on the display timing of the subtitle to be rewound, or can be based on the input of the subtitle display clear from the input unit 26 by the user.

  In addition, when displaying the caption data on the video display unit 21, not only the normal caption is displayed on the video display unit 21 as usual, but also processing for making it easier for the user to understand the program content is performed. You can also. For example, enlargement, background color, character color, typeface, character thickness, shading, brightness, contrast, sharpness, and other various parameters related to the character display mode are displayed by performing various processes that change partly or in combination. You can

  Subsequently, the control unit 10 determines whether or not the rewind playback by subtitles has been completed (step S14). The end of the rewind playback by subtitles is assumed based on the input of the end of the subtitle rewind playback from the input unit 26 by the user, or when the subtitles to be displayed disappear, for example, the rewinding is completed to the beginning of the video content. Is done. If the rewind playback with subtitles has not been completed yet, the process returns to step S13 to continue the rewind playback with subtitles.

  When it is determined in step S14 that the rewind playback by subtitle has been completed, the control unit 10 reads the position information of the content at the time of starting the rewind playback stored in the storage unit 22 in step S13. Further, the control unit 10 starts normal playback for outputting video and audio from the read back playback start position (step S15). As a result, the rewind playback operation with subtitles according to the present embodiment ends.

  If the user does not select rewind playback by subtitles in step S11, the control unit 10 decodes the audio data and video data of the TS packet stored in the recording storage unit 24. 15 and 16 are controlled. When the decoding of each data is completed, the control unit 10 outputs audio based on the decoded audio data to the speaker 19 and outputs the decoded video data to the display control unit 21. The display control unit 21 that has received the decoded video data displays a video based on the video data on the video display unit 21 (step S16). In this way, when the user desires normal rewind playback using video and audio, conventional rewind playback using video and audio is performed.

  Some programs may not provide subtitle broadcasting. Therefore, if it is determined in step S12 that the TS packet stored in the recording storage unit 24 does not include caption data, the process proceeds to step S16.

  In this way, when rewind playback with subtitles is started, rewind playback with only subtitles without video and audio is performed. Also, when the rewind playback with subtitles is finished, normal playback with video and audio is performed from the position where the rewind playback with subtitles is started.

  For example, as shown in FIG. 3, it is assumed that a certain video content is played in the order of scene A, scene B, scene C, and scene D in the normal playback direction. Assume that the playback apparatus 100 is instructed to perform rewind playback with subtitles based on input by the user in scene C during normal playback of such video content. Then, rewind playback of only the subtitles starts in the direction (past) opposite to the normal playback direction (1. Rewind playback in FIG. 3). First, from the scene C to the scene B, subtitles are displayed in order from the lower side to the upper side of the video display unit 21 for each display unit. That is, for example, subtitles as shown in FIG. 4A are sequentially displayed from the bottom to the top.

  Next, from the scene B to the scene A in FIG. 3, the subtitles are displayed in order from the bottom to the top following the previous subtitles of the video display unit 21 for each display unit. That is, for example, subtitles such as those shown in FIG. 4B are sequentially displayed from the bottom to the top following the previous subtitles.

  Thereafter, when the scene A in FIG. 3 is reached, it is assumed that the end of the rewind playback by subtitles is instructed based on the input by the user. Then, the playback is started not from the end of the rewind playback but from the start of the rewind playback (2. playback in FIG. 3). That is, for example, as shown in FIG. 4C, the content of the content from the scene C to the scene D is reproduced in the normal reproduction direction by video and audio. Note that whether or not to display subtitles during this normal playback depends on the setting of the playback device 100.

  Therefore, when the video content is being rewound and played back, the user can grasp the content of the video content such as a program in the forward direction using the subtitles by selecting the rewind playback using the subtitles. Since only the processing of character data is necessary for the rewind playback using the caption, the processing load imposed on the playback device 100 is extremely small. When the rewind playback is completed, the normal playback is started from the position where the rewind playback is started, so that the contents of the program already grasped by the user are not played again. Furthermore, it is not necessary for the user to remember the position at the time of starting the rewind playback. Therefore, the user can grasp the content of the video content efficiently in time without taking time and effort.

  Note that during rewind playback with subtitles, subtitles are displayed from the bottom to the top of the video display unit 21. However, by increasing the speed of rewind playback, the subtitles are displayed more naturally (such as subtitle display in the normal playback direction). B) Captions can be displayed in a manner that is easy for the user to grasp.

(Second Embodiment)
Next, the operation of rewind playback by subtitles according to the second embodiment will be described. The second embodiment is different from the first embodiment described above in changing the subtitle display mode during rewind playback by subtitles.

  This embodiment can be implemented by the same playback apparatus 100 as described in the first embodiment described with reference to FIG. Also, the operation of the playback apparatus 100 according to the present embodiment is almost the same as that of the first embodiment, but the method for outputting a caption during rewind playback by caption is different.

  In the present embodiment, when playing back content while displaying subtitles, the time interval from the time when subtitles are displayed in one display unit to the time when subtitles in the next display unit are displayed is “subtitle display interval”. Measure as Successive subtitles whose measured subtitle display interval is within a predetermined threshold value are output as a single “subtitle group”.

  In general, when subtitle display intervals are short, that is, when subtitles are continuously displayed at short time intervals, the subtitles are often continuously meaningful. On the other hand, when the subtitle display interval between one subtitle and the next subtitle is relatively long, it becomes a meaningful separation, such as changing the scene of the program or changing the theme or topic within the program. There are many cases. Therefore, the playback apparatus 100 appropriately sets a predetermined threshold for the subtitle display interval and stores it in the storage unit 22 in advance. Based on the subtitle display interval, subtitle data is processed in units of “subtitle groups” that are semantically grouped.

  Next, with reference to the flowchart of FIG. 5, the rewind playback operation by subtitles by the playback device 100 of the present embodiment will be described focusing on operations different from those of the first embodiment. Similar to the first embodiment, a case will be described in which video content data recording a program or the like is stored in advance in the recording / storage unit 24 of the storage unit 22.

  First, when video content is being played back in the same situation as in the first embodiment, if the start of rewind playback is instructed by the input from the input unit 26 by the user, the control unit 10 performs the instructed rewind playback by subtitles. It is determined whether or not rewind playback is performed (step S11). When it is determined in step S11 that the instruction is to perform rewind playback by subtitles, the subtitle data detection unit 25 determines whether or not subtitle data is included in the TS packet stored in the recording storage unit 24 (step S12). ).

  In step S <b> 12, when caption data is included in the TS packet stored in the recording / storage unit 24, the control unit 10 controls to decode only caption data from the TS packet in the recording / storage unit 24. When the subtitle data is decoded, the control unit 10 determines the time from the time when the immediately preceding subtitle is erased to the time when the subtitle of the next display unit is displayed in normal playback. (Subtitle display interval) is measured and acquired (step S21).

  Next, the control unit 10 sequentially compares the obtained subtitle display interval between the subtitles with a predetermined threshold stored in the storage unit 22 (step S22). If the acquired subtitle display interval is within a predetermined threshold, the subtitle of the display unit whose subtitle display interval is measured is output as the same subtitle group as the immediately preceding subtitle and stored in the buffer 23 (step S23). If the acquired subtitle display interval exceeds a predetermined threshold, the subtitles in the display unit whose subtitle display interval is measured are stored in the buffer 23 as a new subtitle group different from the immediately preceding subtitle (step S24). When the subtitles constituting the new subtitle group are stored in the buffer 23, if there is a group of subtitles that have already been stored, the control unit 10 reads out the already stored subtitle group from the buffer 23. To the display control unit 20.

  The operations after step S14 and other operations after outputting the caption group in this way are the same as those in the first embodiment. However, since the subtitles to be output are in units of subtitle groups, the display control unit 20 also displays them as a group for each subtitle group when displaying subtitles on the video display unit 21. In this way, since subtitles whose subtitle display interval is within a predetermined threshold are grouped and displayed as the same subtitle group, rewind playback can be performed in which the subtitles are displayed in a manner in which the user can more easily understand the contents of the video content.

  For example, as shown in FIG. 6, a case will be described in which video content including subtitle a1 to subtitle a3, subtitle b1 to subtitle b2, and subtitle c1 to subtitle c3 is played back by rewinding using subtitles. In the normal reproduction of this video content, the subtitles are displayed in the order of subtitle a1, subtitle a2, subtitle a3, subtitle b1, subtitle b2, subtitle c1, subtitle c2, subtitle c3.

  It is assumed that, during normal playback of such video content, rewind playback with subtitles is instructed based on input from the user at the start of rewind playback shown in FIG. Then, the control unit 10 starts rewinding reproduction of only the caption in the direction (past) opposite to the normal reproduction direction. Here, the control unit 10 measures the subtitle display interval with the immediately preceding subtitle in the order of the subtitle c3, subtitle c2, subtitle c1, subtitle b2, subtitle b1, subtitle a3, subtitle a2, and subtitle a1. And get each.

  For example, the subtitle display interval between the subtitle c3 and the subtitle c2 and between the subtitle c2 and the subtitle c1 is within a predetermined threshold, but the subtitle display interval between the subtitle c1 and the subtitle b2 exceeds a predetermined threshold. To do. In this case, the control unit 10 outputs the subtitle c3, the subtitle c2, and the subtitle c1 as a group of “subtitle group C”. For example, as illustrated in FIG. Are sequentially displayed on the video display unit 21. Since the subtitle group C is output as a unit, actually, subtitles as shown in FIG. 7A may be displayed all at once.

  Next, for example, it is assumed that the caption display interval between the caption b2 and the caption b1 is within a predetermined threshold value, but the caption display interval between the caption b1 and the caption a3 exceeds the predetermined threshold value. In this case, the control unit 10 outputs the subtitle b2 and the subtitle b1 as a single “subtitle group B” and displays it as a group of the subtitle group B, for example, as shown in FIG.

  Similarly, for example, when the subtitle display intervals between the subtitle a3 and the subtitle a2 and between the subtitle a2 and the subtitle a1 are within a predetermined threshold, the control unit 10 collects the subtitle a3, the subtitle a2, and the subtitle a1. Are output as “subtitle group A”. In this case, for example, as shown in FIG.

  Also in the present embodiment, as in the first embodiment, when the display is filled up to the upper end of the video display unit 21, the entire subtitle display is moved downward one line at a time as additional subtitles are displayed on the top line. You can scroll. However, in this embodiment, since the subtitles of the subtitle group are displayed together, this scrolling is preferably performed based on the user's operation input. As another mode, when the display is filled up to the upper end of the video display unit 21, all the subtitle display is once cleared, and a mode of newly displaying from the bottom is also conceivable. The subtitle display at this time can be cleared automatically based on the display timing of the subtitle to be rewound, or can be based on the input of the subtitle display clear from the input unit 26 by the user.

  Thus, in this embodiment, a plurality of display screens (for example, FIGS. 7A to 7C) are configured for each subtitle group. In this case, each of these display screens can be switched automatically based on the speed of rewind playback by subtitles, or can be switched based on the input to the input unit 26 by the user.

  In this way, in addition to the advantages obtained in the first embodiment, when performing rewind playback with subtitles, the user grasps the content of video content such as programs in the forward direction with subtitles. Is even easier. Therefore, the user can grasp the contents of the video content more easily with time efficiency and less time and effort.

  In addition, this invention is not limited only to each embodiment mentioned above, Many deformation | transformation or a change is possible. For example, in each of the above-described embodiments, the rewind reproduction by subtitles in the case where the data of the video content in which the program is recorded is stored in the recording / storage unit 24 of the storage unit 22 in advance has been described. Not only in this case, but also when you start real-time playback to watch a program that has not been recorded and played back in the middle, or you can play back the program that is currently being recorded from any location that has already been recorded. The same applies when starting.

  In this case, since it is necessary to extract subtitles from the data being recorded, TS packets received during recording are stored in the buffer 23 instead of the recording storage unit 24 of the storage unit 22. For the portion of the program that has already been recorded, the TS packet is read from the buffer 23, and the subtitle data is extracted from the TS packet, whereby the rewind playback by the subtitle can be started. When the rewind playback by subtitle is finished, the TS packet in the buffer 23 is also read out, and the follow-up playback of the content by video and audio is performed from the point (position) at which the rewind playback by subtitle is started.

  Further, in each of the above-described embodiments, the rewind speed when performing rewind playback by subtitle can be adjusted based on the input to the input unit 26 by the user in consideration of the speed at which the user reads the subtitle. Is preferable. By making the rewind playback speed variable, the user can read subtitles at his / her own pace, making it easier to grasp the contents of the program and the like.

  Further, in each of the above-described embodiments, the video content such as a program to be played back has been described assuming content including video and audio (and subtitle) data. However, for example, the present invention can be applied to content that includes audio and subtitles and does not include video.

It is a functional block diagram which shows schematic structure of the reproducing | regenerating apparatus concerning 1st Embodiment. It is a flowchart explaining the operation | movement of the rewind reproduction | regeneration which concerns on 1st Embodiment. It is a conceptual diagram explaining the operation | movement of the start and completion | finish of the rewind reproduction | regeneration based on 1st Embodiment. It is a figure which shows the example of the display screen by the operation | movement of the rewind reproduction | regeneration by a caption based on 1st Embodiment. It is a flowchart explaining the operation | movement of the rewind reproduction | regeneration which concerns on 2nd Embodiment. It is a conceptual diagram explaining the measurement of the caption display space | interval which concerns on 2nd Embodiment. It is a figure which shows the example of the display screen by the operation | movement of the rewind reproduction | regeneration by a caption based on 2nd Embodiment. It is a conceptual diagram explaining the operation | movement of the start and completion | finish of the rewind reproduction | regeneration by the conventional reproducing | regenerating apparatus.

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 Display control part 21 Video display part 22 Storage part 23 Buffer 24 Recording accumulation Unit 25 subtitle data detection unit 26 input unit 100 playback device

Claims (2)

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 reproduction control unit that outputs only the caption data separated from the stream signal by the separation unit when reproducing the stream signal in a direction opposite to the normal reproduction direction and performing rewind reproduction;
A playback apparatus comprising: An instruction unit for instructing rewind reproduction of the stream signal by the reproduction control unit;
When the instruction unit instructs to rewind the stream signal during the reproduction of the stream signal, the reproduction control unit indicates the position where the instruction unit instructs the rewind reproduction of the stream signal. When the rewind playback of the stream signal is performed and the stop of the rewind playback of the stream signal is instructed by the instruction unit, the position of the rewind playback stored in the storage unit is instructed. 2. The reproduction apparatus according to claim 1, wherein the reproduction is controlled to resume reproduction of the stream signal.

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