JP4666175B2 - Recording / reproducing apparatus and reproducing apparatus - Google Patents

Description

  The present invention relates to a recording / reproducing apparatus and a reproducing apparatus for recording / reproducing video and audio.

  Conventionally, as a device for recording and reproducing video and audio, for example, there is a device for recording and reproducing a television signal such as a video tape recorder. Such a device is one of the special functions, for example, at 1.5 times speed. It has a quick-view function for playback. When this quick-view function is used, the recorded program can be viewed in a shorter time than the recorded time, and this is a very convenient function for a user who has little time to view the recorded program. However, when high-speed playback is performed using this quick-view function, the conversation becomes fast in the conversation portion of the voice, and it is difficult for the user to hear.

Therefore, in order to shorten the playback time without disturbing the grasp of the content of the conversation part, Japanese Patent Application Laid-Open No. 2004-151561 discloses a technique for playing back only a scene where subtitles are displayed at a standard speed, and playing other scenes at high speed.
JP 2001-45408 A

  In Patent Document 1, all sections including caption display are played back at a standard speed. Therefore, since the recorded conversation is reproduced not only at the normal speed or the fast talk section but also at the standard speed in the slow conversation section, there is a problem that the effect of shortening the reproduction time is not sufficient.

  The present invention has been made in view of the above, and a recording / reproducing apparatus capable of shortening the reproduction time when reproducing video and audio including subtitle display using the quick-view function without hindering the grasp of the contents of the conversation part. And it aims at providing the reproducing | regenerating apparatus.

In order to achieve the above object, the recording / playback apparatus of the present invention provides a caption display start time, a caption display end time for each caption display unit, from the caption data of a stream signal including video data, audio data, and caption data, And subtitle information extracting means for extracting the number of subtitle characters as subtitle information, the subtitle information extracted by the subtitle information extracting means, a recording means for storing the stream signal, and reproducing the stream signal stored in the recording means to a reproducing device, per one character of the caption in the section including the display subtitles by dividing the subtitle display time in the subtitle characters between the caption display start time for each display unit of the subtitle and the subtitle display end time The display time is calculated, and the playback speed in the section including the subtitle display is determined according to the calculated display time per character of the subtitle. The playback means is controlled so that the playback speed in a section not including caption display is changed to a maximum playback speed within a speed range below the maximum playback speed and above the playback speed during normal viewing. And a reproduction speed control means.

Also, the playback device of the present invention provides the video data, audio data, subtitle data, and subtitle information including subtitle display start time, subtitle display end time, and number of subtitle characters for each subtitle display unit from the storage medium in which the subtitle information is stored in advance. video data, the audio data, and reproduction means for reproducing the subtitle data, dividing by the subtitle characters subtitle display time between the caption display start time and the caption display end time for each display unit of the subtitles calculates the display time per character caption in the section containing the subtitles, the playback speed in the interval containing the subtitle display according to 1 per character display time of the calculated subtitle does not include subtitle display interval In order to change the playback speed at the maximum playback speed within the speed range below this maximum playback speed and above the playback speed during normal viewing, Serial characterized in that it comprises a playback speed control means for controlling the reproducing means.

According to the present invention, the reproduction time for reproducing the video and audio includes a caption display by using a fast look function, can be reduced without disturbing the contents grasp talking part.

  The best mode for carrying out the present invention will be described below with reference to the drawings. The present invention is applied to special functions (quick look function) such as a DVD recorder or HDD recorder for recording and reproducing digital broadcasts.

  FIG. 1 is a block diagram showing a configuration of a recording / reproducing apparatus according to an embodiment of the present invention. As shown in FIG. 1, the recording / reproducing apparatus according to the present embodiment receives a broadcast signal, converts it into a transport stream (TS) signal including viewable video data, audio data, and caption data, and outputs it. Digital tuner 1, subtitle display start time, subtitle display end time, and subtitle character count for each subtitle display unit from subtitle data, subtitle information extraction unit 2 that extracts subtitle information as subtitle information, and HDD that records TS signals and subtitle information The data storage unit 3 includes a data storage unit 3, a playback speed control unit 4 that generates a playback control signal for controlling the playback speed using caption information, and a playback speed control signal from the playback speed control unit 4. 3 for controlling the playback speed of the TS signal, and converting the obtained variable speed playback stream signal into a video signal and an audio signal and outputting them to the external display device 6 And a stream playback unit 5.

  FIG. 2 is a block diagram showing the configuration of the playback speed control unit 4 of the recording / playback apparatus shown in FIG. As shown in FIG. 2, the playback speed control unit 4 calculates the display time per character in the subtitle display section based on the subtitle display start time, the subtitle display end time, and the number of subtitle characters included in the subtitle information. One character display time calculation unit 41, a comparator 42 that compares the display time per character calculated by the one character display time calculation unit 41 with a predetermined threshold and outputs the result, and subtitles included in the subtitle information A speed control unit 43 that generates a playback control signal for controlling the playback speed based on the display start time, the caption display end time, and the result output of the comparator 42;

  Next, the operation of the recording / reproducing apparatus according to the present embodiment will be described.

  First, during recording, the digital tuner 1 receives a broadcast signal, converts the broadcast signal into a TS signal, and outputs the TS signal. The digital broadcast TS signal includes sub-information such as compressed video data, audio data, and caption data.

  Next, the subtitle information extraction unit 2 extracts the subtitle display start time, the subtitle display end time, and the number of subtitle characters for each subtitle display unit from the subtitle data included in the TS signal from the digital tuner 1 and outputs the subtitle information as subtitle information. To do. The data storage unit 3 records a TS signal from the digital tuner 1 and caption information from the caption information extraction unit 2.

  Then, in the case of performing fast-playing that reproduces the program recorded in the data storage unit 3 by reducing the time, the one-character display time calculation unit 41 stores the subtitle display start time, the subtitle display end time, and the number of subtitle characters between them. Reading from the section 3, subtitle display time is calculated in seconds from the subtitle display start time and subtitle display end time, and a value obtained by dividing the subtitle display time by the number of subtitle characters (one character display time) is output. Then, the comparator 42 compares the one character display time calculated by the one character display time calculation unit 41 with a predetermined threshold value set in advance, and outputs the magnitude.

  The speed control unit 43 generates a playback speed control signal based on the caption display start time, the caption display end time, and the output from the comparator 42, and outputs the playback speed control signal to the variable speed compatible stream playback unit 5. Here, the speed control unit 43 determines whether there is a subtitle-free section, a high-speed subtitle section (a section in which one character display time is larger than the threshold), a normal subtitle display, and a comparison result (large or small) in the comparator 42. The playback speed is set for each subtitle speed section (section where one character display time is equal to or less than the threshold). This playback speed is the maximum speed (for example, 1.5 times normal speed) that can realize the quick look function in the section without subtitles, the standard speed (normal speed) for the normal subtitle speed section, and the speed between them (for example, 1.3 times the normal speed). Set to.

  Then, the variable speed compatible stream playback unit 5 controls the playback speed of the TS signal from the data storage unit 3 by the playback speed control signal from the playback speed control unit 4, and the obtained variable speed playback stream signal is The video signal and the audio signal are converted and output to the external display device 6.

  An example of subtitle display and playback speed is shown in FIG. In this example, the threshold value to be compared with the output value of the one-character display time calculation unit 41 is 0.6 seconds / character, and the playback speed is 1.5 times in the non-subtitle section, 1 time in the normal subtitle speed section, and high-speed subtitles. The section is set to 1.3 times speed.

Since displaying the caption display section A ₁ in 10 characters at 10 seconds, 1 character display time is 1 second / character, is greater than 0.6 sec / characters threshold, at 1.3x as fast subtitle segment Reproduce. Also, the caption display section A _2, since the display 20 characters in 10 seconds, one character display time becomes 0.5 sec / character, since less than 0.6 seconds / character threshold, usually caption speed section To play at 1x speed.

  As described above, according to the present embodiment, the display time per character of the caption in the caption display section is calculated, and the playback speed in the caption display section is changed according to the calculation result. This enables playback speed control according to the conversation speed in the caption display section, and shortens the playback time when playing video and audio including caption display using the quick-view function without interfering with the content of the conversation part. can do. Note that subtitles are not displayed in the playback section including subtitles.

  In the above embodiment, the case where video data, audio data, and subtitle data obtained from the received broadcast signal are recorded and reproduced has been described. However, video data, audio data, subtitle data, and subtitle information are stored in advance. Even when fast-playing from the data storage unit 3 is performed, the same effect as in the above embodiment can be obtained by performing the same processing as the playback speed control unit 4 and the variable speed compatible stream playback unit 5 described above. it can.

(Modification)
The recording / reproducing apparatus according to the modification of the embodiment of the present invention has a configuration in which the reproduction speed control unit 4 shown in FIGS. 1 and 2 is replaced with a reproduction speed control unit 4a shown in FIG. As shown in FIG. 4, the playback speed control unit 4a calculates one character display time for subtitles in the subtitle display section based on the subtitle display start time, the subtitle display end time, and the number of subtitle characters included in the subtitle information. The display time calculation unit 46, the comparator 47A that compares the one character display time calculated by the one character display time calculation unit 46 with a predetermined first threshold and outputs the result, and the one character display time and the predetermined character Comparator 47B that compares the second threshold value and outputs the result, subtitle display start time and subtitle display end time included in the subtitle information, and the result output of comparators 47A and 47B And a speed control unit 48 that generates a reproduction control signal for control.

  The speed control unit 48 determines whether there is no subtitle, the first high-speed subtitle section, the second high-speed subtitle section, and the normal subtitle speed according to the presence / absence of subtitle display and the comparison results (large / small) in the comparators 47A and 47B. Set the playback speed for each section.

  Here, if the first threshold value is smaller than the second threshold value, the first high-speed caption section is a section in which one character display time is longer than the second threshold value, and the second high-speed caption section is one character display. The time is a section that is greater than or equal to the first threshold and less than or equal to the second threshold, and the normal subtitle speed section is a section in which one character display time is smaller than the first threshold.

  The playback speed set by the speed control unit 48 is the maximum speed (for example, 1.5x speed) that can realize the quick-view function in the section without captions, the standard speed (1x speed) in the normal caption speed section, and the first and second high-speed captions. The interval is the speed between them.

  An example of subtitle display and playback speed in this modification is shown in FIG. In this example, the first threshold value to be compared with the output value of the one-character display time calculation unit 46 is set to 0.6 seconds / character, the second threshold value is set to 0.8 seconds / character, and the playback speed is set in the section without captions. 1.5 times normal speed, normal caption speed section is set to 1 time speed, first high speed caption section is set to 1.3 times speed, and second high speed caption section is set to 1.1 times speed.

Since displaying the caption display section B ₁ in 10 characters at 10 seconds, 1 character display time is 1 second / character, is greater than 0.8 sec / characters of the second threshold value, the first fast subtitle segment As 1.3 times faster. Also, the caption display section B _2, since the display 20 characters in 10 seconds, one character display time becomes 0.5 sec / character, since less than 0.6 seconds / character of the first threshold value, usually Playback at 1x speed as the subtitle speed section. Also, the caption display section B _3, since the display 16 characters in 10 seconds, one character display time becomes 0.625 seconds / character, since the first threshold value or more is less than the second threshold value, the It is played back at 1.1 times speed as 2 high-speed caption sections.

  In this way, by providing two comparators for comparing one character display time with a preset threshold value, the playback speed of the subtitle display section can be set in three stages, so that a faster look-up function can be realized. By providing three or more comparators, it is possible to make the playback speed control in the caption display section finer.

It is a block diagram which shows the structure of the recording / reproducing apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structure of the reproduction speed control part of the recording / reproducing apparatus shown in FIG. It is a figure which shows the example of the display and reproduction speed of a caption in embodiment of this invention. It is a block diagram which shows the structure of the reproduction speed control part which concerns on the modification of embodiment of this invention. It is a figure which shows the example of the display of subtitles, and the reproduction speed in the modification of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Digital tuner 2 Subtitle information extraction part 3 Data storage part 4 Playback speed control part 5 Variable speed corresponding stream playback part 41, 46 1 Character display time calculation part 42, 47A, 47B Comparator 43, 48 Speed control part

Claims (2)

Subtitle information extraction means for extracting subtitle display start time, subtitle display end time, and subtitle character count for each subtitle display unit as subtitle information from the subtitle data of the stream signal including video data, audio data, and subtitle data;
Recording means for storing the caption information extracted by the caption information extracting means and the stream signal;
Reproducing means for reproducing the stream signal stored in the recording means;
By dividing by the subtitle characters subtitle display time between the caption display start time for each display unit of the subtitle and the subtitle display end time to calculate the display time per character caption in section including a display subtitles The playback speed in the section including the caption display according to the calculated display time per one character of the caption, the playback speed in the section not including the caption display as the maximum playback speed, and below the maximum playback speed, and And a playback speed control means for controlling the playback means so as to change within a speed range between the playback speed and the normal playback speed. Video data, audio data, subtitle data, subtitle display start time for each subtitle display unit, subtitle display end time, subtitle information including the number of subtitle characters is stored in advance from the storage medium, the video data, the audio data, and the Replay means for replaying subtitle data;
By dividing by the subtitle characters subtitle display time between the caption display start time for each display unit of the subtitle and the subtitle display end time to calculate the display time per character caption in section including a display subtitles The playback speed in the section including the caption display according to the calculated display time per one character of the caption, the playback speed in the section not including the caption display as the maximum playback speed, and below the maximum playback speed, and And a playback speed control means for controlling the playback means so as to change within a speed range between the playback speed and the normal playback speed.

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