JP2004080476A - Digital video reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital video reproducing device capable of finding out a desired scene quickly. <P>SOLUTION: When a video recording instruction for a program is received from a user, a table for associating subtitle character data with presentation time information is created and stored by linking with the recorded program, while a partial TS (Time Stamp) constituting the program and being outputted from a demultiplexer 3 is written in a built-in hard disk drive 6. When an instruction for video search using subtitle characters is received, a character input screen is displayed on an OSD (on screen display) and character input is received. Subtitle characters matched or similar to the inputted characters are searched from the table, and video of the presentation time of the subtitle characters is reproduced. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
[Industrial applications]
The present invention relates to a digital video reproducing apparatus for reproducing received and recorded digital broadcast video and other digital video.
[0002]
[Prior art]
In a digital broadcasting system, information related to a program or the like is added to video and audio by a broadcasting station and compressed, and a transport stream multiplexed by MPEG2 (Moving Picture Experts Group2) is digitally modulated and transmitted. On the receiving device side, the received digital modulation signal is demodulated to generate a transport stream, which is separated into video, audio, and other information and analyzed to present a program or the like to the user. I have. In a digital broadcasting system, for example, information related to subtitles of a movie is stored in a PES (Packetized Elementary Stream) different from video and audio on the broadcast station side and multiplexed with a transport stream for transmission. . In the receiving apparatus, the caption is displayed on the screen by separating and analyzing this information from the transport stream.
[0003]
Also, a digital signal recording device capable of recording a digital signal received by a receiving device has been developed. Various types of digital signal recording devices such as a D-VHS, a hard disk, and a DVD-RAM are known.
[0004]
By the way, caption PES data in which information on captions and superimposed text is stored includes a stream ID, a presentation time stamp (PTS), a decoding time stamp (DTS), a data group ID, and one data group data. The data group data includes one or a plurality of data units. The data group data includes data indicating caption management data and data indicating caption text data, and these are distinguished by the data group ID.
[0005]
The caption management data includes information indicating the caption attributes such as the language_tag (language identification) of the caption and the display format (resolution, vertical / horizontal writing, etc.). For a program displaying captions, at least 5 seconds Once, and is also used as a criterion for determining the presence or absence of subtitles in the program. Further, the caption management data includes information such as TMD (time control mode), num_language (number of languages), DMF (display mode), ISO_639_language_code (language code), and TCS (character encoding method). In the subsequent data unit, caption data that is not related to actual screen presentation is described by an 8-unit code defined by ARIB STD-B3 and ARIB STD-B24. On the other hand, in the data unit of the caption sentence data, the contents of the caption and the superimposed text to be actually displayed are described by an 8-unit code. Further, TMD and STM (presentation start time) are included, and the STM stores a value indicating a time to be synchronized when time synchronization is designated by TMD.
[0006]
Captions to be displayed on the screen can be displayed in synchronization with video by following the TMD in the caption text data and the PTS in the data group containing the caption text data (PTS synchronization). On the other hand, the superimposed text can be displayed at a specific time in synchronization with the TMD and STM in the caption text data (STM synchronization).
[0007]
[Problems to be solved by the invention]
By the way, when the user wants to see (play) a certain scene in the recorded video, the user will search for the scene by, for example, fast-forward playback. However, it is troublesome to search for a desired scene in such fast forward reproduction.
[0008]
The present invention has been made in view of the above circumstances, and has as its object to provide a digital video reproducing apparatus capable of quickly searching for a desired scene using subtitle characters as a clue.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a digital video playback device for playing back a digital video recorded on a recording medium is provided in a digital video playback device. Means for displaying a list of subtitle characters and their presentation time information based on the list, and means for reproducing and outputting video data based on the presentation time information corresponding to the subtitle character selected on the list display. It is characterized by.
[0010]
According to the above configuration, a desired scene can be quickly searched for based on a list of subtitle characters, instead of searching for a scene (video) by fast-forwarding the image.
[0011]
According to the digital video reproducing apparatus of the present invention, in a digital video reproducing apparatus for reproducing digital video recorded on a recording medium, a means for receiving an input of a search word is associated with subtitle characters and presentation time information thereof. Means for obtaining presentation time information by searching for a caption character that matches or is similar to the input search word based on the table, means for reproducing and outputting video data corresponding to the obtained presentation time information, It is characterized by having.
[0012]
According to the above configuration, a desired scene can be quickly searched for by a subtitle character that matches or is similar to the character input by the user, instead of searching for a scene (video) by fast-forwarding the video.
[0013]
In addition, when a plurality of subtitle characters are searched to obtain a plurality of presentation time information, a presentation time list is displayed, and video data corresponding to the presentation time information selected by the user is reproduced and output. May be configured. Also, a list of subtitle characters and their presentation time information within a time period including the front side and / or the rear side of the presentation time selected by the user in the presentation time list is displayed, and the presentation selected on this list display is performed. It may be configured to reproduce and output video data based on time information.
[0014]
A receiving means for receiving the digital broadcast; a recording means for recording the received digital broadcast; and a table creating means for extracting caption character data from the digital broadcast and creating a table in association with the presentation time information. It is good to be provided and constituted.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing a digital broadcast receiving apparatus having a video recording / reproducing function according to this embodiment.
[0016]
The antenna 1 is arranged outdoors in a predetermined direction, and receives a digital broadcast wave transmitted from, for example, a BS (Broadcasting Satellite). The antenna 1 generally includes a frequency converter, and supplies a received / frequency-converted signal to a tuner 2.
[0017]
The tuner 2 extracts a signal of a specific frequency from the received high-frequency digital modulation signal. That is, a process of selecting one from a plurality of digital broadcast transponders is performed. Further, the tuner 2 includes a demodulation circuit, a deinterleave circuit, an error correction circuit, and the like, and thereby demodulates the selected digital modulation signal and outputs a transport stream.
[0018]
The demultiplexer (DEMUX) 3 converts the transport stream received from the tuner 2 into a video stream of MPEG2 (Moving Picture Experts Group2), an audio stream, a PSI / SI (Program Specific Information / Service Information), and other information. To separate. The demultiplexer 3 supplies the video stream and the audio stream to the AV decoder 4, and supplies other information such as PSI / SI and subtitle character data to the MPU 17. A plurality of channels are multiplexed in the transport stream, and a process for selecting an arbitrary channel from among these is performed by multiplexing any channel in the transport stream with any packet ID from the PSI / SI. It becomes possible by taking out data such as whether or not it has been converted. Further, the selection of the transport stream (the selection of the transponder) can also be performed based on the PSI / SI information.
[0019]
The recording / playback processing unit 4 writes the partial TS output from the demultiplexer 3 into the built-in hard disk drive (HDD) 6, reads the partial TS from the hard disk drive 6, and reads the external device (another digital broadcast receiving device, audio set, etc.). , A video camera, a digital device such as a storage, etc.) 31, and input / output a partial TS via the IEEE1394 interface 5.
[0020]
The AV decoder 7 includes a video decoder that decodes a video stream and an audio decoder that decodes an audio stream. The video decoder obtains a quantized coefficient and a motion vector by decoding the input coded signal, and performs inverse DCT transform, motion compensation control based on the motion vector, and the like. The audio decoder decodes the input coded signal to generate audio data. The video data generated by the decoding is output to the video processing circuit 8, and the audio data is output to the audio processing circuit 9.
[0021]
The video processing circuit 8 receives the video data from the AV decoder 7, performs D / A conversion, and converts the data into, for example, a composite signal in the NTSC format. The audio signal processing circuit 9 receives the audio data output from the AV decoder 7, performs D / A conversion, and generates, for example, a right (R) sound analog signal and a left (L) sound analog signal.
[0022]
The video output circuit 10 and the audio output circuit 11 include an output resistor, an amplifier, and the like. The AV output terminal 12 is provided with an output unit (a set of left and right audio output terminals and the like and a video output terminal), and a monitor 14 having a display and a speaker is connected to the output unit by a video / audio code 13. .
[0023]
The OSD (on-screen display) circuit 19 outputs to the adder 20 bitmap data based on character information and color information instructed to be output from the MPU 17. The adder 20 performs a process of incorporating a video based on the bitmap data into a received video. The OSD circuit 19 performs various displays such as an EPG (Electronic Program Guide) screen display based on the PSI / SI received by the MPU 17, a menu screen display, a caption display using caption character data, a search word input screen display, a search result display, and the like. Is achieved.
[0024]
The remote control transmitter 15 is a transmitter for sending a command to the broadcast receiving device 30. When a key provided on the remote control transmitter 15 is operated, a signal light (remote control signal) indicating a command corresponding to the key is transmitted from a light emitting unit (not shown). The remote control light receiver 16 receives a signal light emitted when a key of the remote control transmitter 15 is operated, converts the signal light into an electric signal, and supplies the electric signal to the MPU 17. Characters are assigned to each key of the remote control transmitter 15, and in the character input mode, operation of each key is processed as a character input command.
[0025]
The memory (for example, a flash ROM or an EEPROM) 18 stores program guide data for displaying an EPG screen, and is used to create a table that associates subtitle character data with its presentation time information.
[0026]
The MPU 17 performs the following processing on subtitle characters.
[0027]
▲ 1 ▼. When the user selects the subtitle display mode, the video display is performed by incorporating the currently received subtitle character data into the currently received program video.
[0028]
▲ 2 ▼. When a program recording instruction is received from the user, the partial TS constituting the program output from the demultiplexer 3 is written to the internal hard disk drive (HDD) 6 or to the external device 31.
[0029]
(3). When the program is recorded, a table is created in which the subtitle character data is associated with the presentation time information. The presentation time information only needs to be able to correspond to the caption character appearance timing and the video at that time. For example, a timer is started at the start of recording, and the timer time at the time of the appearance of the caption character is used as the presentation time information. Alternatively, PTS (Presentation Time Stamp) or the like in the caption text data may be used as the presentation time information. The table is created by using the memory 18, and the created table is recorded in the built-in hard disk drive 6 or the like so as to be linked with the recorded program. FIG. 2 schematically shows the contents of the created table.
[0030]
▲ 4 ▼. When receiving a video search command using subtitle characters in the reproduction of a recorded program or DVD, the character input screen is displayed by OSD and character input is accepted. It is assumed that the DVD stores the contents corresponding to the table in advance.
[0031]
▲ 5 ▼. If, for example, the “OK” button is operated after the character input, a video search using subtitle characters is executed. First, a subtitle character that matches or is similar to the input character is searched from the table, and as shown in FIG. 3, a list of presentation time information of the searched subtitle character is displayed.
[0032]
▲ 6 ▼. A list of subtitle characters and the presentation time information within a predetermined time including the rear side of the presentation time selected by the user on the presentation time information list screen is displayed. FIG. 4 shows an example of this list display.
[0033]
▲ 7 ▼. On the list display screen illustrated in FIG. 4, the user can select a desired location as shown in FIG. Based on the presentation time information of the selected location, the MPU 17 issues a command to the recording / playback processing unit 4 to reproduce the video data from the location corresponding to the time.
[0034]
In the above example, a list of the subtitle characters and the presentation time information within a predetermined time including the rear side of the presentation time selected by the user on the presentation time information list screen shown in FIG. 3 is displayed. However, a list of subtitle characters and their presentation time information within a predetermined time including the front side of the presentation time may be displayed. Also, without displaying such a list of subtitle characters and their presentation time information, the presentation time (for example, 00:00:31) selected by the user on the presentation time information list screen shown in FIG. Based on this, the video may be reproduced immediately. At this time, for example, a “next” button is displayed on the screen, and when this button is operated, or when the right key or the like of the remote control transmitter is operated, at the next presentation time (00:00:31). Based on this, reproduction may be performed.
[0035]
In addition, the presentation time is searched based on the input search word, but a list of the subtitle characters and the presentation time information within the entire time or within a predetermined time range is displayed, and from this list, The user may be allowed to select a subtitle character (presentation time).
[0036]
【The invention's effect】
As described above, according to the present invention, instead of searching for a scene (video) by fast-forwarding a video, a desired subtitle character is displayed by a subtitle character displayed in a list or by a subtitle character that matches or is similar to the character input by the user. This has the effect that the scene can be found quickly.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a digital broadcast receiving apparatus according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram schematically showing a table in which subtitle characters and their presentation time information are associated with each other.
FIG. 3 is an explanatory diagram showing a screen display example of a search result.
FIG. 4 is an explanatory diagram exemplifying a list screen of subtitle characters and their presentation time information displayed when a selection is made from the search results of FIG. 3;
FIG. 5 is an explanatory diagram showing an example of selection on the list screen of FIG. 4;
[Explanation of symbols]
2 Tuner 3 Demultiplexer 5 IEEE1394 interface 17 MPU
18 Memory 30 Digital broadcast receiving device 31 External device

Claims (5)

In a digital video reproducing apparatus for reproducing digital video recorded on a recording medium, means for displaying a list of subtitle characters and their presentation time information based on a table in which subtitle characters and their presentation time information are associated with each other; Means for reproducing and outputting video data based on presentation time information corresponding to subtitle characters selected on the display. In a digital video reproducing apparatus for reproducing a digital video recorded on a recording medium, a means for receiving an input of a search word, and the input search word based on a table in which subtitle characters and their presentation time information are associated with each other. Digital video playback, comprising: means for searching for subtitle characters matching or similar to the above to obtain presentation time information; and means for reproducing and outputting video data corresponding to the obtained presentation time information. apparatus. 3. The digital video playback device according to claim 2, wherein when a plurality of caption characters are searched to obtain a plurality of presentation time information, a presentation time list is displayed, and the presentation time information selected by the user among them is displayed. A digital video reproducing apparatus configured to reproduce and output video data corresponding to. 4. The digital video playback device according to claim 3, wherein a list of subtitle characters and the presentation time information within a time including the front side and / or the rear side of the presentation time selected by the user in the presentation time list is displayed. A digital video reproducing apparatus configured to reproduce and output video data based on the presentation time information selected on the list display. 5. The digital video reproducing apparatus according to claim 1, wherein a receiving means for receiving the digital broadcast, a recording means for recording the received digital broadcast, and a method for extracting and displaying subtitle character data from the digital broadcast. A digital video reproducing apparatus comprising: a table generating means for generating a table in association with time information.

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