JP2007158959A - Optical disk reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk reproducing device in which caption information in the past can be efficiently retrieved and easily checked during ordinary reproduction and the ordinary reproduction is performed while controlling the program search of a video scene including desired caption information in the past. <P>SOLUTION: Caption information presented during ordinary reproduction and presentation time information of that caption information are sequentially stored in a caption information table 8, a caption history picture is formed on the basis of the stored information in the caption information table 8, desired caption information is selected using the formed caption history picture, and content of that caption can be confirmed. Furthermore, when it is desired to backwardly reconfirm a video scene containing selected caption information on the basis of that caption information, presentation time information of the relevant caption information stored in the caption information table 8 is acquired, the program search and reproduction of the video scene containing the relevant caption information are performed using the acquired presentation time information, and the video scene and the caption information accompanying it are displayed, thereby confirming the content of the caption. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical disc reproducing apparatus for reproducing presentation information recorded on an optical disc, and in particular, presentation information includes at least video information, audio information, and subtitle information. When displaying, video information and subtitle information corresponding to the video information are displayed. The present invention relates to an optical disc reproducing apparatus capable of obtaining a composite image with the above.

  In general, a typical optical disk includes a recording medium called a DVD (Digital Versatile Disk). This DVD includes presentation information such as video information and playback control of the presentation information. Navigation information is recorded. In this case, the DVD records a plurality of audio information such as an original language and a dubbed language, and subtitle information consisting of a plurality of languages as presentation information in addition to video information such as a movie. Information and caption information can be combined and reproduced.

  A DVD player that reproduces such a DVD (corresponding to an optical disk reproducing apparatus, hereinafter referred to as an optical disk reproducing apparatus) refers to time information included in navigation information and presentation information recorded on the DVD. The function to start playback from a specific scene at the time of display (scene jump or chapter jump) can be realized, and the optical disk playback device has a fast-forward key and a fast-rewind key that change the playback speed step by step, It is common to have a key and a frame return key.

  By the way, in the optical disc playback apparatus, when a DVD such as a foreign language title being played cannot be heard well, the subtitle start timing during normal playback is checked in order to reconfirm that portion of the speech. The subtitle end timing is detected, and the playback position information is stored for each detected unit subtitle. If this playback position information is used, the display image is moved back to the beginning of the desired line, and normal playback is performed from there. An optical disk reproducing apparatus that can restart (replay) is known, and an example thereof is disclosed in JP-A-2003-23607.

In addition, as another type of optical disc playback apparatus of this type, the presented subtitle information is recorded in a memory so that the subtitle information displayed in the past can be reconfirmed, and the user can display the presented subtitle information. As an example, there is known an optical disc playback apparatus that can output video information that is currently displayed in accordance with a user's instruction by synthesizing and outputting subtitle information that has been displayed in the past. Is disclosed in Japanese Patent Application Laid-Open No. 2004-213832.
JP 2003-23607 JP 2004-213832 A

  When playing a DVD using an optical disk playback device and viewing video information such as a foreign film, for example, the information content obtained from the caption information displayed by the user is large in understanding the content of the content. May occupy specific gravity. In the case of watching an unfamiliar foreign language-speaking movie with subtitles translated into their native language, the information content obtained from the subtitle information occupies a very important weight.

  In this case, assuming that a movie with foreign language audio information and native language subtitle information is to be watched, the display of the native language subtitle information is performed in synchronization with the display of the corresponding video information and the utterance of the foreign language audio information. Therefore, for example, in a scene where characters are talking, the subtitle display update speed may be high (the update frequency per unit time is high), while on the other hand, such as narration that contains many explanatory elements In a scene, the amount of information per unit time is large, and in addition, there are cases where a video scene that does not display subtitles at all continues. Are arranged.

  By the way, as described above, if the frequency of subtitle display per unit time increases, the user may not be able to grasp the entire contents of the video scene due to overlooking the subtitle display or watching the subtitle display. In such a case, the user makes full use of the fast-rewind key and the frame-rewind key of the optical disk playback device to rewind to a video scene including a subtitle display to be confirmed again or a missed subtitle display, and then plays again from there. The contents of the overwritten caption display will be grasped. However, since the subtitle display period is not fixed at regular intervals, it is irrelevant to the video information update display interval. It is difficult to find a video scene including subtitle information intended by the user efficiently and accurately by simply operating the keys.

  On the other hand, the optical disc playback apparatus disclosed in Japanese Patent Laid-Open No. 2003-23607 (Patent Document 1) uses the playback position information held for each unit subtitle to return the display content to a certain serif location. If normal playback is resumed later, reverse playback control by unit subtitles can be realized, and it can be said that this is one method to solve the above problem, but the video scene for which subtitle information is to be reviewed is unit If it is unclear how many units of subtitles were displayed before, it is difficult to perform playback control to accurately return the video scene, while a video scene containing the desired subtitle information is Until it is found, for example, by repeatedly operating the return key of the unit caption, that is, repeating the playback control of the unit caption traced back in the past direction by each operation. Each time, the pickup control of the optical disk playback device, the search of the video information and the caption information, the decoding process and the synthesis process are necessary, and the processing amount per time becomes large, which may impair the operation feeling. is there.

  In addition, the optical disc playback apparatus disclosed in Japanese Patent Application Laid-Open No. 2004-213832 (Patent Document 2) stores the presented subtitle information, so that the subtitle information is stored without performing the pickup control of the optical disc playback apparatus or the subtitle decoding process. Although it can be reviewed, the output display screen only displays the composite video of the video information at the time of operation and the presented subtitle information, and only when you want to reconfirm only the subtitle display content, That is, it is never an effective means for reproducing a video scene including past caption information and reconfirming the contents.

  The present invention has been made in view of such a technical background, and an object of the present invention is to easily search and review past caption information during normal playback. An object of the present invention is to provide an optical disc reproducing apparatus capable of resuming normal reproduction by performing cueing control of the included video scene.

  In order to achieve the above object, an optical disk reproducing apparatus according to the present invention is an optical disk recording video information, presentation information including audio and subtitle information reproduced in synchronization therewith, and navigation information used for reproduction control of the presentation information. An optical disc reproducing apparatus for performing reproduction, an information reading unit for reading encoded recording information of the optical disc, a video decoding unit for decoding the read encoded video information, and an audio decoding unit for decoding the read encoded audio information A subtitle decoding unit that decodes the encoded subtitle information, a subtitle information table that stores a predetermined number of combination information of the subtitle information decoded by the subtitle decoding unit and the presentation time information during normal reproduction, and a decoded video A video information scaler unit that selectively enlarges / reduces information and a plurality of suggestions extracted from the caption information table. A subtitle history forming unit that forms a subtitle history screen in which the subtitle information is arranged, and normal level video information or video information that has been enlarged / reduced in level are selected, and subtitle information during normal playback or the subtitle history screen is selected An information switching unit, an information synthesis unit that synthesizes two pieces of information selected by the information switching unit, a system controller that performs overall control of each unit, and a remote control unit that selects control contents of the system controller by key operation When the desired subtitle information is selected from a plurality of pieces of subtitle information on the subtitle history screen, the system controller obtains the presentation time of the selected subtitle information from the subtitle information table and is recorded on the optical disc. Control means for cuing and reproducing the content from the presentation time using the navigation information It is those who are.

  Further, the subtitle history configuration unit of the optical disc playback apparatus having the above configuration arranges and arranges a plurality of presented subtitle information as subtitle history information on the screen in the order of presentation in the playback time axis past direction, and reconstructs the subtitle history information. When performing, it is formed to be able to selectively switch whether to reconfigure by changing all the presented subtitle information, or to replace only some of the presented subtitles, When there is no desired subtitle information in the currently displayed subtitle history information, the subtitle history is presented by the presented subtitle information reconstruction selection unit that instructs whether one of the reconstruction units reconstructs the subtitle history information. The reconfiguration means of the component is selected.

  As described above, according to the optical disc playback apparatus of the present invention, during normal playback, the caption information displayed in the past in order to grasp the caption information displayed in the past and the contents of the video information during the normal playback. Are stored in the subtitle information table together with the presentation time, a subtitle history screen with excellent searchability is formed using the stored information of the subtitle information table, and past subtitle information is displayed using the display content of the formed subtitle history screen. If the user does not want to go back in the video scene and wants to check only the subtitle information, the content search processing such as pick-up control of the optical disc playback apparatus is performed. It is possible to omit the execution of various controls, and it is possible to immediately respond to a desired request without impairing the user's operational feeling. .

  Also, according to the optical disc playback apparatus of the present invention, after searching for subtitle information, the user desires to reconfirm the content of the subtitle information in a state of going back to a past video scene including the subtitle information. In this case, there is an effect that the presentation time of each unit subtitle is acquired from the subtitle information table, and the cue playback of the video scene including the subtitle information can be accurately performed based on the acquired time information.

  Embodiments of an optical disk reproducing apparatus according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing the main configuration of an optical disk reproducing apparatus according to an embodiment of the present invention, and shows an example in which the optical disk is a DVD.

  As shown in FIG. 1, an optical disk reproducing apparatus according to this embodiment includes a DVD 1, an optical disk drive unit 2, a demultiplexer (DEMUX) 3, a system clock counter (STC) 4, and an audio decoding unit that constitute an optical disk. 5, video decoding unit 6, subtitle information decoding unit 7, subtitle information table 8, video information scaler unit 9, subtitle history configuration unit 10, video switch 11, subtitle switch 12, signal synthesis Unit 13, audio output terminal 14, video output terminal 15, system controller 16, remote control receiver 17, and remote control device 18, and these components are as shown in FIG. 1. Interconnected.

  In this case, the DVD 1 is a presentation information including video information and audio information such as a movie, subtitle information superimposed on the display video and sub-picture information including the display position information of the subtitle information, and content reproduction. Navigation information used for control is recorded, and voice information in a foreign language and caption information in a native language are recorded. The optical disk drive unit 2 is composed of a spindle motor that rotates the DVD 1 and circuits such as an optical pickup circuit that reads recorded information on the DVD 1, a data demodulation circuit, and an error correction circuit, and supplies stream data to the subsequent demultiplexer 3. . The demultiplexer 3 separates the stream data supplied from the optical disc drive unit 2 for each data type, and presentation information corresponding to the following three audio decoding units 5, video decoding units 6, and subtitle decoding units 7. Supply. In addition, the navigation information separated in the demultiplexer 3 is supplied to the system controller 16. The system clock reference (SCR) is loaded into the system clock counter 4 in order to reset the system clock counter (STC) 4.

  The audio decoder 5 decodes the compressed audio information supplied from the demultiplexer 3 into audio information, converts the obtained audio information into an audio signal through a built-in D / A converter, and externally connects through the audio output terminal 14. An audio signal is supplied to the other acoustic equipment not shown. The video decoding unit 6 decodes the compressed video information supplied from the demultiplexer 3 into video information, and outputs the decoded video information. The subtitle decoding unit 7 decodes sub-picture information such as subtitle information supplied from the demultiplexer 3, outputs the decoded subtitle information, and includes subtitle information (bitmap data) and presentation time information of the subtitle information. The combination information with the PTS is supplied to the caption information table 8 and sequentially stored therein. Note that the audio decoding unit 5, the video decoding unit 6, and the caption decoding unit 7 have a function of searching for a video signal and an audio signal to be output at an arbitrary presentation time under the control of the system control 16.

  Further, the system controller 16 uses the navigation information obtained from the demultiplexer 3 to supply presentation information at an arbitrary presentation time to the corresponding audio decoding unit 5, video decoding unit 6, and subtitle decoding unit 7, so that the optical disk drive Optimum read control is performed on the unit 2, and the cueing decoding function in the audio decoding unit 5, the video decoding unit 6 and the subtitle decoding unit 7 to be output at the control of the optical disc drive unit 2 and an arbitrary presentation time Thus, it is possible to perform cue playback from an arbitrary presentation time in the middle of the content recorded on the DVD 1. The video information scaler unit 9 is controlled by the system controller 16 and has a function of arbitrarily enlarging / reducing the video signal level output from the video decoding unit 6. The subtitle history configuration unit 10 is controlled by the system controller 16 to acquire a plurality of subtitle information stored in the subtitle information table 8, and arranges the acquired plurality of subtitle information at arbitrary positions to form a subtitle history It has the function to do.

  The video changeover switch 11 is controlled by the system controller 16 to selectively switch between a normal level video signal output from the video decoding unit 6 and a video signal scaled by the video information scaler unit 9. Thus, the video signal obtained by the switching is supplied to the signal synthesizer 13. The subtitle changeover switch 12 is controlled by the system controller 16, and the subtitle history formed through the video signal including the subtitle information at the time of normal reproduction output from the subtitle decoding unit 7 and the video history configuration unit 10. Are selectively switched, and the video signal obtained by the switching is supplied to the signal synthesizer 13. At this time, the signal synthesizer 13 synthesizes the video signal supplied from the video changeover switch 11 and the video signal including the caption information obtained by switching the caption changeover switch 12, and the video output terminal 15 as one video signal. Output to the outside. A display (not shown) is connected to the video output terminal 15, and the display displays a video obtained by synthesizing subtitles at the time of normal reproduction or reproduction display of the subtitle history screen at the time of subtitle replay.

  The remote control receiving unit 17 receives a control command composed of radio waves or light transmitted from a remote control device 18 that remotely controls the optical disc playback device, and supplies the received control command to the system controller 16. When the system controller 16 receives a control command from the remote control receiver 17, the system controller 16 controls each unit of the optical disc playback device in accordance with the content of the control command. Although not shown in FIG. 1, as will be described later, a plurality of keys having the same functions as the plurality of keys assigned to the remote control device 18 may be arranged on the optical disk reproducing device side.

  Here, FIG. 2 is a top view showing an example of a plurality of key arrangements in the remote control device 18 shown in FIG.

  As shown in FIG. 2, the remote control device 18 is arranged in the upper area of FIG. 2 at the four keys 20 arranged at the upper, lower, left and right parts constituting the cross cursor key and at the center of the four keys 20. 2 is arranged, a subtitle replay key 22 is arranged in the left area of FIG. 2, a key 23 for returning to the right area of FIG. 2 is arranged, and a fast reverse key 24 and a reproduction key are arranged in the lower area of FIG. 25, fast-forward key 26, pause key 27, stop key 28, and slow key 29 are respectively arranged.

  In this case, the four keys 20 are keys used to move the cursor displayed on the caption history display screen in either the up / down / left / right directions in the subtitle replay mode, and the enter key 41 is used in the subtitle replay mode. This key is used when cueing and reproducing a video scene including selected subtitle information. The caption replay key 22 is a key used when shifting from the normal operation mode to the caption replay mode during normal playback. The return key 23 is a key used when returning from the subtitle replay mode to the normal reproduction operation in the subtitle replay mode. The fast-rewind key 24, the playback key 25, the fast-forward key 26, the pause key 27, the stop key 28, and the slow key 29 are used for DVD content playback control, as are the keys of a remote control device used in known optical disk devices. The key to use. Among them, the play key 25 and the stop key 28 are keys that function effectively in the subtitle replay mode, and the play key 25 in the subtitle replay mode has the same function as the return key 23 in the subtitle replay mode. The stop key 28 in the subtitle replay mode is a key used to stop the reproduction of the DVD content in the same manner as the stop key is operated in the normal reproduction. In the subtitle replay mode, all other operations of the playback control key 24, fast forward key 26, pause key 27, and stop key 29 are ignored. The cross cursor key 20, the enter key 21, and the return key 23 may be assigned other functions when they are in a state other than the subtitle replay mode, and are not shown in FIG. A power key, an input switching key, a numeric keypad, etc. may be arranged as can be seen in a remote control device used in the optical disc apparatus.

  Next, the operation of each unit when the subtitle replay function is performed in the optical disc playback apparatus having the configuration shown in FIG. 1 will be described.

  Here, FIG. 3 is an explanatory diagram showing the information structure of the combination information of the caption information and the PTS stored in the caption information table 8, and the caption information table 8 is displayed in the caption decoding unit 7 during normal playback. The subtitle information decoded in step (bitmap data) and a plurality of (N) pieces of PTS that define the presentation timing of the subtitle information are stored for each piece of subtitle information.

  The caption information table 8 sequentially captures and stores combination information of normal caption information output from the caption decoding unit 7 to the caption changeover switch 12 and the PTS of the normal caption information, and can be held in the caption information table 8. After storing the maximum number (N), the oldest combination information is deleted, and the latest combination information is stored instead. Specifically, after the storage capacity of the caption information table 8 is filled with the caption information [N-1] and PTS [N-1] captured in the latest data entry 32, the subsequent caption information [N] and The PTS [N] is stored by overwriting the data entry 31 in which the most recent subtitle information [0] and PTS [0] are stored. Such information update processing in the caption information table 8 is always executed during normal reproduction.

  When the user desires to perform subtitle replay during normal playback and presses the subtitle replay key 22 of the remote control device 18 shown in FIG. 2, the system controller 16 receives from the remote control device 18 received through the remote control receiver 17. The control command (command) is analyzed, and the optical disk playback device is shifted to the subtitle replay mode based on the analysis result. When the optical disc playback apparatus shifts to the subtitle replay mode, the control of the optical disc drive unit 2, the audio decoding unit 5, the video decoding unit 6 and the subtitle decoding unit 7 executed by the system controller 16 is performed by temporarily stopping the remote control device 18 during normal playback. This is the same as when the key 27 is operated. When the playback key 25 is pressed after the output of the video information and the audio information is paused, each of the playback is resumed from the paused state to the normal playback resumed state. Control the components.

  Next, FIGS. 4A to 4C show configuration examples of the caption history screen displayed in the caption replay mode, and the caption history screen is sequentially displayed when the subtitle replay mode is shifted from the normal playback mode. An example when it changes is shown. Note that these subtitle history screens are formed by the subtitle history configuration unit 10, and subtitle information [0] to subtitle information [0] formed in a plurality of (L) stages from the top to the bottom in the area on the right side of the screen. L] level, icon-type cursors formed on the four sides of the subtitle information [0] to subtitle information [L] level, and still images formed on the left side of the screen slightly beyond the middle portion And a determination icon and a return icon formed side by side below the video screen.

  First, the subtitle history screen 40 shown in FIG. 4A is a subtitle history screen displayed when the subtitle replay mode is shifted from the normal reproduction time. The subtitle history screen 40 obtains a plurality (L) of subtitle information including subtitle information having the latest PTS from the subtitle information table 8 from the subtitle information table 8, and updates the latest subtitle information [0]. The subtitle information [1], [2],..., [L-1] is arranged in the upper stage 41 so that the subtitle information [1], [2],. By viewing this subtitle history screen, the user can check a plurality of (L) pieces of subtitle information displayed in the past in a stationary state at a time.

  In this case, the icon type cursors 42 formed on the four sides of the caption information [0] to the caption information [L] stage correspond to the four cross cursor keys 20 of the remote control device 18 shown in FIG. In the example illustrated in FIG. 4A, the latest caption information [0] 41 is highlighted with the icon cursor 42. Each time the up key or the down key of the cross cursor key 20 is pressed, an instruction is sent from the system controller 16 to the caption history component 10, and the icon-type cursor 42 moves up and down. The screen highlighting the caption information is reconstructed. For emphasis display of subtitle information, for example, the display color of subtitle information may be changed, or the display size of subtitle information may be changed.

  Now, when the lowermost caption data [L-1] 43 is highlighted by the movement of the icon cursor 42, the downward key of the cross cursor key 20 of the remote control device 18 is continuously pressed. Then, the caption history configuration unit 10 reconstructs the caption history screen shown in FIG. 4B and updates the caption history screen. The subtitle history screen in FIG. 4B includes a plurality of subtitle history data [L] 44 acquired from the subtitle information table 8 instead of the latest subtitle information [0] 41 in the subtitle history screen in FIG. (L) This is an updated subtitle history screen in which pieces of subtitle information are rearranged in order of presentation time, that is, the lower one is older. In this case, as long as the reconfigurable subtitle history screen does not exceed the range of the number (N) of subtitle information stored in the subtitle data table 8, every time the downward key of the cross cursor key 20 is pressed, The caption history screen is reconstructed in such a way that the caption information is traced back one by one. On the other hand, when the up direction key of the cross cursor key 20 is pressed, the subtitle history screen is reconstructed in a manner that the subtitle information goes back to the future one by one as in the case described above.

  Next, in a state where the caption history screen illustrated in FIG. 4B is displayed, when the right direction key of the cross cursor key 20 is pressed, the caption history configuration unit 10 displays An updated subtitle history screen in which the subtitle history is reconstructed as shown in FIG. The subtitle history screen illustrated in FIG. 4C is a subtitle information including a plurality of (L) pieces of subtitle information including the previously displayed subtitle information [L + 1] 49 with respect to the subtitle information of FIG. 4B. This is an updated subtitle history screen obtained from the information table 8 and arranged in order of presentation time, that is, in such a manner that the lower one becomes older. Also in this case, as long as the number (N) of subtitle information stored in the subtitle information table 8 is not exceeded, every time the right key of the cross cursor key 20 is pressed, a plurality (L) of subtitle information is stored. The subtitle history screen is reconfigured in a way that goes back in the past. On the other hand, the same applies to the case where the left direction key of the cross cursor key 20 is pressed, and the subtitle history screen is reconfigured in a form that goes back to the future in units of plural (L) subtitles.

  As described above, the up / down direction key and the left / right direction key of the cross cursor key 20 of the remote control device 18 are assigned to the keys so that different unit amounts of subtitle information are updated. Thus, if the subtitle history screen is reconfigured, the user can efficiently search for desired subtitle information. Note that the triangular icon cursors 42 and 44 shown on the caption history screens in FIGS. 4A and 4B show a state in which the effective direction is highlighted by the key operation of the cross cursor key 20. Show.

  In the subtitle replay mode, the video changeover switch 11 and the subtitle changeover switch 12 have their movable contacts switched to the lower side in FIG. 1 under the control of the system controller 16, thereby forming the subtitle history configuration unit 10. The formation information of the subtitle history screen is combined with the formation information of the video still screen reduced by the video information scaler unit 9 in the signal synthesis unit 13 shown in FIG. 1 and supplied from the video output terminal 15 to a display (not shown). The On the other hand, during normal playback, the video switch 11 and the subtitle switch 12 have their movable contacts switched in the upward direction in FIG. 1 under the control of the system controller 16, and are thereby output from the video decoder 6. The main video image information that does not pass through the video information scaler unit 9 and the normal subtitle information synchronized with the main video image information output from the subtitle decoding unit 7 are synthesized by the signal synthesis unit 13 and supplied from the video output terminal 15 to the display. Is done.

  Next, a case where a video scene including arbitrary subtitle information in the subtitle history is reproduced while the subtitle history screen shown in FIG. 4 is displayed will be described.

  For example, when it is desired to reproduce the video scene including the subtitle information [L] 48 in FIG. 4B, the user presses the down key of the cross cursor key 20 of the remote control device 18 to operate FIG. ) Is highlighted and the enter key 21 is pressed. At this time, when recognizing that the enter key 21 is pressed in the subtitle replay mode, the system controller 16 requests the subtitle history configuration unit 10 to acquire the PTS of the subtitle information being highlighted. The caption history configuration unit 10 acquires the target caption information from the position information of the caption information being highlighted, and transmits the PTS of the caption information to the system controller 16. When the system controller 16 receives the PTS, the system controller 16 appropriately causes the optical disc drive unit 2, the audio decoding unit 5, the video decoding unit 6, and the subtitle decoding unit 7 to perform cueing reproduction control targeting the PTS, thereby switching the video. The switch 11 and subtitle switch 12 are controlled to shift to a state in which a video scene including desired subtitle information is normally reproduced.

  In this case, when the return key 23 is pressed instead of pressing the enter key 21 of the remote control device 18, the video changeover switch 11 and the caption changeover switch 12 are controlled to be switched, the optical disc drive unit 2, the audio The pause state of the decoding unit 5, the video decoding unit 6, and the caption decoding unit 7 is canceled, and reproduction is resumed.

  With the above operation history, the user confirms the content of the subtitle information by reviewing only the past subtitle information, resumes the normal playback that has been temporarily suspended, and searches for the video scene that includes the subtitle information. The user can select to confirm the contents of the video scene.

  When the determination key 21 or the return key 23 of the remote control device 18 is pressed while the subtitle history screen is displayed, the determination icon 46 and the return icon 35 in FIG. 4A are highlighted. , Transition to the normal playback state.

It is a block block diagram which shows embodiment of the optical disk reproducing | regenerating apparatus by this invention. It is a top view which shows an example of the key arrangement | positioning of the remote control key apparatus used for the optical disk reproducing apparatus shown in FIG. It is explanatory drawing. It is explanatory drawing which shows an example of the data structure of a caption information table in the optical disk reproducing device shown in FIG. An example of the displayed subtitle history screen It is explanatory drawing which shows an example of the display content of the caption history screen used for the optical disk reproducing device shown in FIG.

Explanation of symbols

1 Optical disc (DVD)
2 Optical disk drive 3 Demultiplexer (DEMUX)
4 System clock counter (STC)
5 Audio Decoding Unit 6 Video Decoding Unit 7 Subtitle Information Decoding Unit 8 Subtitle Information Table 9 Video Information Scaler Unit 10 Subtitle History Configuration Unit 11 Video Change Switch 12 Subtitle Change Switch 13 Signal Synthesizer 14 Audio Output Terminal 15 Video Output Terminal 16 System Controller 17 Remote control receiver 18 Remote control device

Claims (2)

An optical disc playback apparatus for playing back an optical disc on which video information and presentation information including audio and subtitle information to be played back synchronously and navigation information used for playback control of the presentation information are recorded. An information reading unit for reading information, a video decoding unit for decoding the read encoded video information, an audio decoding unit for decoding the read encoded audio information, a subtitle decoding unit for decoding the encoded subtitle information, and normal playback A caption information table for storing a predetermined number of combination information of the caption information decoded by the caption decoding unit and the presentation time information therein, a video information scaler unit for selectively enlarging / reducing the decoded video information, A subtitle history configuration unit for forming a subtitle history screen in which a plurality of presented subtitle information extracted from the subtitle information table is arranged; Select normal-level video information or level-enlarged / reduced video information, and combine the information switching unit that selects subtitle information during normal playback or the subtitle history screen, and the two pieces of information selected by the information switching unit An information synthesizing unit, a system controller that performs overall control of each unit, and a remote control unit that selects control contents of the system controller by key operation, and the system controller selects desired information from a plurality of subtitle information on the subtitle history screen. When the subtitle information is selected, the presentation time of the selected subtitle information is acquired from the subtitle information table, and the content is cued and reproduced from the presentation time using the navigation information recorded on the optical disc. An optical disc reproducing apparatus comprising: means. The subtitle history composing unit enumerates and arranges a plurality of presented subtitle information as subtitle history information on the screen in the order of presentation in the reproduction time axis past direction. When reconfiguring the subtitle history information, It is formed so that it can be selectively switched between restructured by changing all of the presented subtitle information or reconfiguring only some of the presented subtitles, and the subtitle history information currently displayed When there is no desired subtitle information, the reconfiguration unit of the subtitle history configuration unit selects by the presented subtitle information reconfiguration selection unit that instructs whether one of the reconfiguration units reconfigures the subtitle history information. The optical disk reproducing apparatus according to claim 1, wherein

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