JP2004266390A - Information recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recorder which efficiently records caption information on a recording medium. <P>SOLUTION: This information recorder is provided with a means (26) for separating main video data and subvideo data from stream data, a means (19 and 51) for obtaining character data superimposed on the main video data, a first table (19 and 52) for language codes of the subvideo data, a second table (19 and 52) for language codes of the extracted character data, a comparing means (35) for comparing the language of the subvideo data with that of the obtained character data by using the first and second tables, and a recording means (24) for recording the subvideo data and the extracted character data on the recording medium when the comparing means determines that languages are different. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an information recording device, and more particularly, to an information recording device that performs recording on a recording medium such as a DVD (Digital Versatile Disc).
[0002]
[Prior art]
The DVD is obtained by digitally compressing sub video data such as main video, audio, and characters (captions) and recording the data on an optical disc. The data signal recorded on the DVD includes a main video, a plurality of types (for example, different languages) of audio, and a plurality of types (for example, different languages) of sub-picture data (SP data) which are packetized and recorded. I have.
[0003]
Also, closed caption data (CC data) that is integrated with the main video data and packetized exists as caption data different from the sub video. This CC data is originally data for subtitles designed for the hearing impaired, and is currently used in broadcasts, DVDs, and video tapes in the United States, for example, for subtitle data containing onomatopoeia and second foreign languages. Is used as subtitle data. In the NTSC (National Television on System Committee) system, 525 scanning lines are provided in the vertical direction, and 30 frames are displayed per second (interlace display). Of these 525 lines, the timing corresponding to the first 21 lines of each field (two frames constitute one frame) is allocated for an interval for starting scanning, and this is a VBI (Vertical Blanking Interval; vertical). This is called a blanking period. Closed captioning is also called the Line 21 method because the 21st VBI is used.
[0004]
When both the SP data and the CC data are reproduced, since the display position of each signal is not considered at all, when both the signals are reproduced and displayed, they overlap and disturb the image. Sometimes.
[0005]
For this reason, in the conventional DVD reproducing apparatus, the display area and display period of the sub-picture data and the display area and display period of the closed caption data are detected, and the display image by the sub-picture data and the display image by the closed caption data are detected. At least one of the display images is changed so as not to overlap (for example, see Patent Document 1).
[0006]
On the other hand, in recent years, there is an information recording / reproducing apparatus that converts a television broadcast with CC data into DVD stream data and records the data on a DVD. According to this information recording / reproducing apparatus, it is possible to extract information necessary for displaying character code data from CC data, convert the information into sub-pictures, and reproduce the sub-pictures.
[0007]
[Patent Document 1]
JP-A-11-168702 (pages 4, 5; FIG. 2)
[0008]
[Problems to be solved by the invention]
However, if the stream data with CC data further includes sub-picture data, the language of the sub-picture data is not compared with the language of the CC data.
[0009]
Therefore, even if both are in the same language, they are recorded regardless of the DVD, and a plurality of subtitles in the same language are written on the DVD, resulting in wasted recording capacity.
[0010]
An object of the present invention is to provide an information recording device that records caption information efficiently on a recording medium.
[0011]
[Means for Solving the Problems]
A first invention is means for separating the main video data and the sub-video data from stream data including main video data and sub-video data, and means for extracting character data superimposed on the main video data, Using the first table of the language code of the sub-picture data, the second table of the language code of the extracted character data, and the first and second tables, the sub-picture data and the extracted character data are compared. An information recording apparatus comprising: comparing means for comparing languages; and recording means for recording the sub-picture data and the extracted character data on a recording medium when the comparing means determines that the languages are different.
[0012]
A second invention is the information recording apparatus according to the first invention, wherein the recording means records the sub-picture data and the extracted character data on the recording medium as sub-picture data.
[0013]
A third invention is the information recording apparatus according to the first invention, wherein the stream data is recorded on another recording medium different from the recording medium.
In a fourth aspect, when the comparing means determines that the languages of the sub-picture data and the extracted character data are the same, and further compares the words and determines that the words are different, the recording means The information recording apparatus according to the first invention, wherein the sub-video data having different words and the extracted character data are recorded on the recording medium.
[0014]
A fifth invention is characterized in that the comparing means checks whether or not the words of the sub-picture data and the extracted character data have the same onomatopoeia to determine whether or not the words are different. An information recording apparatus according to a fourth aspect of the present invention.
[0015]
A sixth aspect of the present invention is the fourth aspect of the present invention, wherein even when the comparing means compares the words, if the words are determined to be the same, only the sub-picture data is recorded on the recording medium. An information storage device.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a case where DVD stream data without CC data is recorded on a recording medium will be described, and then a case where DVD stream data with CC data is recorded on a recording medium will be described.
[0017]
(Recording of DVD stream data without CC data on recording medium 25)
FIG. 1 is a block diagram illustrating a configuration of a recording / reproducing device 100 according to the present embodiment. The case where DVD stream data without CC data is recorded on the recording medium 25 will be described with reference to FIG.
[0018]
The recording / reproducing device 100 drives two recording media 25 and 37 such as a recordable and detachable DVD, and writes and reads signals to and from the recording media 25 and 37 by a pickup (not shown). Is provided. Here, the disk drive unit 24 is used for recording, and the disk drive unit 36 is used for reproduction.
[0019]
The switches SW1 and SW2 are provided on the a side when recording TV broadcast or analog video / audio input on the recording medium 25, and when recording video / audio data on the recording medium 37 for reproduction on the recording medium 25 for recording. Are connected to the b side. Thus, the video / audio data is input to the data multiplexing unit 22. On the other hand, when the sub-picture data of the recording medium for reproduction 37 is recorded on the recording medium 25 for recording, the data multiplexing unit 22 is transmitted via the data processing unit 22, the data separation unit 26, and the sub-picture comparison unit 35. (Details will be described later).
[0020]
The overall control unit 10 controls the entire recording and reproducing apparatus 100. The overall control unit 10 executes control in response to, for example, recording, reproduction, and other various commands from a host device (not shown).
[0021]
When a command to record a TV broadcast on the recording medium 25 is given from the host device, the overall control unit 10 connects the switches SW1 and SW2 to the terminal a and prepares the disk drive unit 24 for recording. Give instructions.
[0022]
Upon receiving this command, the disk drive unit 24 reads management data from the recording medium 25 and determines a data write area on the recording medium 25. Next, the overall control unit 10 reads the determined data write area from the disk drive unit 24, performs write settings for the data write area in the management area of the recording medium 25, and sets the write start address to the disk drive unit 24. Set to.
[0023]
Next, the overall control unit 10 resets the STC (System Time Clock) 11. STC11 is a system timer. Recording and reproduction of the recording media 25 and 37 are performed based on the value of the STC 11. Thus, the preparation for recording on the recording medium 25 is completed.
[0024]
Thereafter, the TV tuner unit 14 outputs a video analog signal (composite signal or S signal) and an audio analog signal (L, R). The video analog signal and the audio analog signal output from the TV tuner section 14 are input to a video selection section 15 and an audio selection section 16, respectively. The video selector 15 and the audio selector 16 select video / audio between the output of the TV tuner 14 and the video / audio inputs 12 and 13.
[0025]
The video signal selected by the video selector 15 is supplied to a video signal decoder 17, and the audio signal selected by the audio selector 16 is supplied to an A / D converter 18.
[0026]
The video signal decoding unit 17 decodes the supplied analog video signal, converts it into a digital video signal (ITU-Rec. 656), and sends the digital video signal to the video signal compression unit 20.
[0027]
The A / D converter 18 converts the supplied analog audio signal into a digital signal and sends the digital signal to the audio signal compressor 21.
The video signal compressing section 20 and the audio signal compressing section 21 compress the digitized video signal and audio signal, respectively, into packets, and send them to the data multiplexing section 22. Here, the video signal compression unit 20 and the audio signal compression unit 21 determine and record PTS (Presentation Time Stamp) and DTS (Decoding Time Stamp) of each packet as necessary according to the output value of the STC 11.
[0028]
The data multiplexing unit 22 packs the input packet data and adds an SCR (System Clock Reference) to the head of the pack according to the value of the STC 11. The data multiplexing unit 22 has a format processing unit (not shown), and performs a format process in accordance with the DVD-Video standard or the DVD-Recording standard in the format processing unit.
[0029]
FIG. 2 shows the VOB (Video Object) structure of the DVD-Video standard (DVD Specification for Read-Only Disc), and FIGS. 3 shows a VOB configuration.
[0030]
VOB is a unit of DVD reproduction. The VOB is composed of a smaller VOBU (Video Object Unit). In the DVD-Video standard, a VOBU always has one navigation pack (NV_PCK) at the beginning, followed by an audio pack (A_PCK), a video pack (V_PCK), and a sub-picture pack (SP_PCK). Each pack has a pack header and a packet header, followed by one or more packets. This pack is the minimum unit for performing data transfer processing. According to the DVD-Video standard and the DVD-Recording standard, it is possible to set information indicating the type of language used for each sub-picture of each channel.
[0031]
The VOBU includes one or more GOPs (Group Of Pictures), and the playback time is specified to be 0.4 seconds to 1.0 seconds. According to the DVD-Recording standard, as shown in FIG. 3, a VOBU may have an RDI (Real Time Data Information) pack (RDI_PCK) at the top, or may not have an RDI (PC) as shown in FIG.
[0032]
The VOBU includes an audio pack (A_PCK), a video pack (V_PCK), and a sub-picture pack (SP_PCK), as in the DVD-Video standard. Each pack has a pack header and a packet header, followed by one or more packets. This pack is the minimum unit for performing data transfer processing. Further, the VOBU includes one or more GOP data, and the reproduction time is specified to be 0.4 seconds to 1.0 seconds.
[0033]
In the navigation pack and the RDI pack, address information and time information of the pack necessary for controlling the reproduction of the DVD are recorded.
The data stream multiplexed and formatted by the data multiplexing unit 22 is sent to the data processing unit 23. The data processing unit 23 creates an ECC (Error Correcting Code) group by grouping the data streams for every 16 sectors, attaches the ECC to the group, and sends the ECC group to the disk drive unit 24. Then, the disk drive unit 24 records data on the recording medium 25. At this time, one pack is recorded in one sector.
[0034]
(Recording DVD stream data with CC data on recording medium 25)
Next, recording of DVD stream data with CC data on the recording medium 25 will be described. In the closed captioning system, character code data is superimposed as an encoded decoded signal during the blanking period of field 21 (fields 1 and 2 in the extended mode) and line 21 of the standard NTSC video signal. One frame of CC data includes a code (Character1, Character2) of 2 bytes (4 bytes in the extended mode). This code includes control codes and data codes that define the behavior of the decoder.
[0035]
Referring to FIG. 5, in this recording / reproducing apparatus 100, data of a recording medium 37 in which a broadcast (for example, a broadcast in the United States) in which CC data is inserted as line 21 data of a DVD stream (main video signal) is recorded. The operation when recording on another recording medium 25 while reproducing will be described.
[0036]
In the figure, hatched blocks and solid lines indicate active blocks and signals, respectively, and dotted blocks and dotted lines indicate inactive blocks and signals, respectively.
[0037]
When the overall control unit 10 receives, from a host device (not shown), an instruction to record the data of the recording medium 37 in which the CC is recorded as the line 21 data of the DVD stream on the recording medium 25, the switch SW1 and the switch SW2 Is connected to the terminal b, and a command for recording preparation is given to the disk drive unit 24.
[0038]
Upon receiving this command, the disk drive unit 24 reads management data from the recording medium 25 and determines a data write area on the recording medium 25. Next, the overall control unit 10 reads the determined data write area from the disk drive unit 24, performs write settings for the data write area in the management area of the recording medium 25, and sets the write start address to the disk drive unit 24. Set to.
[0039]
Next, the overall control unit 10 resets the time of the STC 11.
Further, the overall control unit 10 receives a reproduction command of the recording medium 37 from the host device, reads the content of the management area of the recording medium 37 via the disc drive unit 36 and the data processing unit 23 on the reproduction side, and based on the content, Determine the address to be played. Thus, the preparation for recording the data on the recording medium 25 while reproducing the data on the recording medium 37 is completed.
[0040]
Thereafter, the overall control unit 10 sends the previously determined reproduction address and read command to the disk drive unit 36. The disk drive unit 36 reads the sector data from the recording medium 37 in accordance with the read command, performs error correction in the data processing unit 23, converts the data into pack data, and outputs it to the data separation unit 26.
[0041]
The data separation unit 26 extracts a pack header from the pack data and separates a video (main video) packet, an audio packet, and a sub-picture (sub-video) packet. The video packet is sent to the data multiplexing unit 22 via the switch SW1 and at the same time to the video signal decompression unit 28. The audio packet is sent to the data multiplexing unit 22 via the switch SW2. The (existing) sub-picture packet is sent to the sub-picture comparing unit 35. The navigation pack is stored in an internal memory of the overall control unit 10.
[0042]
The video signal decompression unit 28 extracts a packet header from the video packet and performs grammatical interpretation of the video elementary stream. Here, the structure of the video data of the DVD stream is shown in FIG.
[0043]
The configuration of the video elementary stream will be described with reference to FIG.
The video elementary stream conforms to the MPEG2 video (or MPEG1 video) standard and has a hierarchical structure. The top sequence layer starts with a sequence header (SH: Sequence Header), followed by one or more GOPs (Group Of Pictures), and ends with a sequence end code (SE: Sequence_End_code). The GOP layer starts with a GOP header (GH: Group of picture Header), followed by user data (UD) if a user data start code (US: User_data_Start_code) exists, and is followed by one or more pictures (PIC). Exists. The picture layer starts with a picture header (PH: Picture_Header) and includes one or more macroblocks (MB: MacroBlock).
[0044]
In the case of a DVD stream, line 21 data (L21) compliant with the EIA-608 standard can be recorded in user data (UD) of the GOP layer. In the recording / reproducing apparatus 100 of this embodiment, it is possible to record on a different recording medium while reproducing a recording medium on which character information of CC data is recorded as line 21 data.
[0045]
Hereinafter, the flags in the user data (UD) will be described.
When Line_21_indicator is “4343h”, it indicates that the user data (UD) following this is line 21 data.
Top_field_flag_gop is “1” when the video stream is MPEG2 video (ISO13818-2), indicating that the first display field of the first picture in the GOP is the top field, and “0” indicates that it is the bottom field. . Also, when the video stream is MPEG1 video (ISO117172-2), this flag must be "1".
[0046]
Number_of_displayed_field_gop indicates the number of display fields in the GOP, and must be equal to the number of line 21 data (L21) recorded repeatedly. However, when the video stream is MPEG1 video (ISO117172-2), it must be equal to twice the number of pictures in the GOP.
[0047]
Line21_switch indicates that the line 21 data (L21) following when "1" is valid and conforms to the EIA-608 standard. "0" indicates that the following line 21 data (L21) is invalid, and the data must be ignored.
[0048]
Line21_data (line 21 data) includes line21_data1 (8 bits) and line21_data2 (8 bits), and corresponds to Character1 data and Character2 data in the EIA-608 standard, respectively. Further, the Ms (Most Significant) bit of each byte is a subsequent 7-bit parity bit, followed by bit 6 to bit 0 in order.
[0049]
FIG. 7 shows a waveform of line 21 data defined by the EIA-608 standard. A start bit signal following the clock run-in (Clock Run-in) is followed by a Character1 signal and a Character2 signal. The data in the user data (UD) corresponds to this signal.
[0050]
The video signal decompression unit 28 has a user data area in the GOP layer (User_data_Start_code exists), and this user data (UD) is valid line 21 data (line 21_data_indicator = “4343h” and line 21_switch = “1”). If this is the case, the line 21 data is sent to the sub-picture compression unit 19, which is a sub-picture generation unit.
[0051]
The sub-picture compression unit 19 performs the following processing.
As shown in FIG. 8, the sub-picture compression section 19 includes a VBI data decoding section 51, a character generation section 52, a kanji ROM (Read Only Memory) section 53, a frame memory section 54, a sub-picture encoding section 55, and a buffer memory. 56.
[0052]
The buffer memory 56 is a memory for buffering the line 21 data sent in a burst. The VBI data decoding unit 51 enables the data request signal while the buffer memory 56 has a vacancy, requests data from the video signal decompression unit 28, and disables the data request signal when there is no vacancy.
[0053]
Further, the VBI data decoding unit 51 reads out the line 21 data stored in the buffer memory 56 and extracts information necessary for displaying the CC signal. At this time, since the transmitted character code data is text data, the VBI data decoding unit 51 converts the character code data into bitmap data (font data) in the character generation unit 52 and the kanji ROM unit 53. After that, the data is developed in the frame memory unit 54.
[0054]
Here, the “information necessary for displaying the CC signal” described above will be described with reference to FIGS. 9 to 12. FIG. 9A shows an example of transmission of a control signal of CC data. Each control signal is composed of a pair of one byte, and is always transmitted to line 21 of the first field, and is transmitted twice repeatedly for correct reception. FIG. 9B shows a display example when a control signal as shown in FIG. 9A is transmitted. In this example, ABCDE is displayed on the 14th line, and FGHIJK is displayed on the 15th line.
[0055]
FIG. 9A is briefly described as follows.
An instruction to load caption data is executed by "14 20" and "14 20". Next, an instruction to switch a pair of memories constituting the CC code decoder is executed by “142F” and “142F”. Next, it is determined by "14 52" and "14 52" that the display start position is 14 rows and 4 columns. The next data 41, 42, 43, 44 and 45 correspond to the characters ABCDE. The next 00 means that the control data comes next, and the next “14 72” and “14 72” means that the display start position is 15 rows and 4 columns. Subsequently, the data 46, 47, 48, 49, 4A and 4B correspond to the characters FGHIJK.
[0056]
As the control codes in the CC system, there are three different types of control codes for specifying format, position, genre <BR>, and character display. They are a preamble address code (not shown), a Mid-Row code (not shown), and a Miscellaneous (various) control code (FIG. 10). This Miscellaneous (various) control code is the above-mentioned "information necessary for displaying a CC signal".
[0057]
FIGS. 11 and 12 show typical character codes. The character generator 52 has such a character code.
After the development of one frame is completed in the frame memory unit 54, the one-frame writing end signal and the value of the reproduction start time PTS (Presentation Time Stamp) are sent to the sub-picture encoding unit 55.
[0058]
After receiving the one-frame write end signal, the sub-picture encoding unit 55 reads out the data line by line, performs run-length compression processing, further performs packetization, and performs sub-picture comparison as a new sub-picture packet. Send to section 35.
[0059]
The sub-picture comparing unit 35 compares the language of the existing (original DVD stream) sub-picture packet sent from the data separating unit 26 with the language of the sub-picture packet newly generated from the CC data. This comparison method will be described with reference to FIG.
[0060]
First, the language of the existing sub-picture packet is recognized (S101). This recognition method will be described using the DVD volume space shown in FIG. The language included in the sub-picture of the DVD stream is the video title set sub-picture stream attribute table (VTS_SPST_ATRT) in the video title set information management table (VTSI_MAT) of the video title set information (VTSI). See With respect to all valid sub-picture streams recorded in the attribute table, the language is recognized by referring to a specific code (Specific code). Specifically, when the sub-picture type (Sub-picture type) of the video title set sub-picture stream attribute table (VTS_SPST_ATRT) is '01b', the specific code (Specific code) is ISO (International Organization For). (Standardization: International Standards Organization) -639 indicates a language code consisting of two lowercase letters defined by the standard, the first byte represents the first character of the language symbol, and the second byte represents the second character of the language symbol. Therefore, if the sub-picture comparison unit 35 has a table of the language code of the ISO-639 standard, the language of the existing sub-picture packet can be recognized.
[0061]
Next, the language of the newly generated sub-picture packet is recognized from the CC data (S102). The language of CC recognizes the language in the code range of EIA (Electronic Industries Alliance; (USA) Electronics Industry Association) -608 standard of the data channel. If it is within the code range of standard characters (corresponding to 26 English alphabets), it is determined to be "English", and symbols in the code range of data channels 1122 to 1227 and data channels 2 of 1A20 to 1A27 appear frequently. In this case, it is determined that the data channel 1 is “Spanish”. If the data channel 1 frequently includes symbols in the code range of 1A30 to 1A3F and the data channel 2 frequently includes symbols in the code range of 1A30 to 1A3F, the data channel 1 is determined to be “French”. When symbols in the code range of 1B20 to 1B2F for the data channel 2 frequently appear on 132F, it is determined that the port channel is “Portugues”. Other languages also recognize in the code range according to the EIA-608 standard. Therefore, if the sub-picture comparison unit 35 has a table of language codes of the EIA-608 standard, it is possible to recognize the language of a new sub-picture packet based on CC data.
[0062]
Then, it is compared whether the two recognized languages are the same (S103). If the language is not the same, if the language is not the same (for example, English and Spanish), the sub-picture comparing unit 35 multiplexes the existing sub-picture packet with the sub-picture packet newly generated from the CC data to record. It can be recorded on the medium 25 (S104). When a plurality of sub-pictures are multiplexed, encoding is performed by changing sub_stream_id (identification number) in the private data area. This enables the channel selection of the sub-picture at the time of reproduction. Here, the private data area will be described. The sub-picture pack includes a sub-picture header and a sub-picture packet, and the sub-picture packet includes a packet header, a private data area, and a sub-picture data area. The sub-picture pack is in the VOBS for Title in FIG. That is, a VOBS (Video Object Set) includes a plurality of VOBUs, and a sub-picture pack is included in the VOBU.
[0063]
On the other hand, if the language is the same, it is further compared whether the language is the same (including the onomatopoeia in addition to the spoken language) (S105). Whether the words are the same may be compared by the sub-picture comparing unit 35 using a table of a language code of the ISO-639 standard and a language code of the EIA-608 standard.
[0064]
If not, the sub-picture packet newly generated from the CC data can be recorded on the recording medium 25 by multiplexing the sub-picture packet with the existing sub-picture packet (S106). However, if the words are the same, the recording on the recording medium 25 is not performed by stopping the multiplexing of the sub-picture packet newly generated from the CC data (S107).
[0065]
In this way, efficient caption information can be recorded on the recording medium 25.
When the sub-picture packet newly generated from the CC data is multiplexed with the existing sub-picture packet, the overall control unit 10 rewrites the contents of the navigation packet, and pack and packet time stamp information (SCR, DTS, PTS). Is rewritten as necessary.
[0066]
The data stream multiplexed and formatted by the data multiplexing unit 22 is sent to the data processing unit 23. The data processing unit 23 collects the data for every 16 sectors into an ECC (Error Correcting Code) group, attaches the ECC to the ECC group, sends the ECC to the disk drive unit 24, and records the data on the recording medium 25.
[0067]
Finally, the operation of reproducing the recording medium 37 will be described.
First, upon receiving a reproduction command from the host device, the overall control unit 10 reads the contents of the management area of the recording medium 37 via the disk drive unit 36 and the data processing unit 23, and determines an address to be reproduced based on the content. .
[0068]
Thereafter, the overall control unit 10 sends the previously determined reproduction address and read command to the disk drive unit 36. The disk drive unit 36 reads the sector data from the recording medium 37 in accordance with the received read command, performs error correction in the data processing unit 23, converts the data into pack data, and outputs it to the data separation unit 26.
[0069]
The data separation unit 26 extracts a pack header from the pack data and separates video packets, audio packets, and sub-picture packets.
The video packet is transferred to the video signal decompression unit 28, the audio packet is transmitted to the audio signal decompression unit 29, and the sub-picture packet is transmitted to the sub-picture decompression unit 27. The navigation pack (NV_PCK) or the RDI pack (RDI_PCK) is stored in an internal memory for processing by the overall control unit 10 so that the overall control unit 10 can access it at any time.
[0070]
For each packet data, the PTS is loaded into the STC 11 at the start of transfer, and then the video signal decompression unit 28, the audio signal decompression unit 29, and the sub-picture decompression unit 27 synchronize with the PTS value in the packet data (PTS And a reproduction process (comparing with the output value of the STC 11). Then, the reproduced data is input to the graphic processing unit 30. The video signal and the sub-picture signal are output to the video output terminal 33 via the video signal encoding unit 31. The audio signal is output to the audio output terminal 34 via the D / A converter 32.
[0071]
Since the above-described embodiments are preferred specific examples of the present invention, various technically preferable limitations are given. However, any combination and change may be made as appropriate without departing from the spirit of the present invention. It goes without saying that it can be done. For example, even when a plurality of CC data (caption information) extracted from the line 21 data superimposed on the DVD stream are included, each of the caption information is added with a different identification number, converted into a sub-picture, and recorded. It may be recorded on a medium.
[0072]
【The invention's effect】
As described above, according to the present invention, it is possible to provide an information recording device that efficiently records subtitle information on a recording medium.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an information recording apparatus 100 according to an embodiment.
FIG. 2 is a diagram showing a VOB configuration of the DVD-Video standard.
FIG. 3 is a diagram showing a VOB configuration of the Video-Recording standard.
FIG. 4 is a diagram showing a VOB configuration of the Video-Recording standard.
FIG. 5 is a block diagram showing the configuration of the information recording device 100 according to the embodiment.
FIG. 6 is a diagram showing a configuration of video data of a DVD stream.
FIG. 7 is a diagram showing a waveform of line 21 data.
FIG. 8 is a diagram showing a configuration of a sub-picture compression unit.
FIG. 9 is a view showing an example of transmission data of closed caption data and a display example thereof.
FIG. 10 is a diagram showing a control code of a closed caption system.
FIG. 11 is a diagram showing a character code of a closed caption system.
FIG. 12 is a diagram showing a character code of a closed caption system.
FIG. 13 is a flowchart of a sub-picture packet comparison method.
FIG. 14 is a diagram showing a volume space of a DVD.
[Explanation of symbols]
10 Overall control unit
11 STC
12 Video input terminal
13 Audio input terminal
14 TV tuner section
15 Video selector
16 Audio selection section
17 Video signal decoding unit
18 A / D converter
19 Sub-picture compression unit
20 Video signal compressor
21 Audio signal compression unit
22 Data multiplexing section
23 Data processing unit
24, 36 disk drive
25, 37 Recording medium
26 Data separation unit
27 Sub-picture expansion unit
28 Video signal decompression unit
29 Audio signal expansion unit
30 Graphics processing unit
31 Video signal encoder
32 D / A converter
33 Video output terminal
34 Audio output terminal
51 VBI data decoding unit
52 Character generation section
53 Kanji ROM
54 Frame memory section
55 Sub-picture encoding unit
56 buffer memory

Claims (6)

Means for separating the main video data and the sub video data from stream data including main video data and sub video data,
Means for extracting character data superimposed on the main video data,
A first table of language codes of the sub-picture data;
A second table of language codes of the extracted character data;
Comparing means for comparing languages of the sub-picture data and the extracted character data using the first and second tables;
An information recording apparatus comprising: a recording unit that records the sub-picture data and the extracted character data on a recording medium when the comparison unit determines that the language is different. 2. The information recording apparatus according to claim 1, wherein the recording unit records the sub-picture data and the extracted character data as sub-picture data on the recording medium. 2. The information recording apparatus according to claim 1, wherein the stream data is recorded on another recording medium different from the recording medium. If the comparing means determines that the language of the sub-picture data and the extracted character data are the same, and further compares the words, and determines that the words are different, the recording means sets the sub-words having different words. 2. The information recording apparatus according to claim 1, wherein the video data and the extracted character data are recorded on the recording medium. 5. The apparatus according to claim 4, wherein the comparing unit checks whether or not the words of the sub-picture data and the extracted character data have the same onomatopoeia to determine whether the words are different. Information recording device. 5. The information storage device according to claim 4, wherein even if the comparing unit compares the words, if the words are determined to be the same, only the sub-picture data is recorded on the recording medium.

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