JP4206862B2 - Data reproducing apparatus and method - Google Patents

Description

The present invention relates to a data reproducing apparatus and a data reproducing method for reproducing audio data or video data as main data and auxiliary data thereof from a data recording medium .

  The sampling frequency generated by the DSD (Direct Stream Digital) method for a compact disc (CD) in which the sampling frequency fs is about 44.1 kHz and one sample is recorded as 16-bit digital audio data for each channel. A Super Audio Compact Disc (SACD) has been known which records 1-bit audio stream data at a very high frequency (for example, 64 times the sampling frequency fs of a normal CD). It was. As will be described later, when the input signal is subjected to 64 fs oversampling / ΔΣ modulation, a 1-bit audio digital signal is obtained. In the CD system, the 1-bit signal is decimated from the 1-bit signal to the multi-bit PCM code immediately after that. In the SACD employing the DSD system, the 1-bit audio signal is directly recorded.

  As other large-capacity optical disks, DVDs (Digital Versataile Disks) are also widely used. Digitally record video, audio, data, etc. In particular, DVD-Audio is specialized for music. Further, the DVD group includes a DVD-Video for digital video, a DVD-ROM for an external storage device such as a personal computer, a write-once DVD-R, and a rewritable DVD-RAM. A DVD records various information by forming marks due to phase changes on a signal recording surface with a laser beam based on recording data.

  As a music optical disc, a mini disc (MD, registered trademark) having a diameter of 64 mm is widely used. A data compression method called ATRAC (Adaptive Transform Coding) is adopted.

  In these optical discs, supplementary data associated with main data is recorded in addition to main data such as audio data or video data. Auxiliary data includes information such as the song number, index, and time, as well as text data relating to the disc title name, song name, performer name, composer name, and the like.

  By playing these optical discs with an optical disc playback device, the audio data of the music is read out and output as audio signals from the speakers, and the song title and composer name are displayed on the liquid crystal display (LCD) as character information. can do. The disc playback apparatus can also display character information such as movie subtitles, music titles, lyrics, and liner notes as a still image. In order to make these auxiliary information compatible with multiple languages, it is conceivable to have a plurality of character information channels.

  Taking Super Audio SACD as an example, when a disc, a track title, etc. are recorded in the TOC area as a character code string, the same information can be recorded in different languages of up to 8 channels. The disc player selects and displays one of these channels as desired by the user.

  By the way, in Super Audio CD, as described in Japanese Patent Application Laid-Open No. 2002-367288, character information is also included in auxiliary (hereinafter referred to as supplementary) data packets multiplexed with audio data as main data. Can be recorded. Since the supplementary data can be synchronized with the audio data in time, for example, it is also possible to display lyrics one line at a time according to the song.

JP 2002-367288 A

  However, since there is an upper limit on the transfer rate for supplementary data, character information is recorded on a disk for a plurality of channels so that it can be displayed at a desired time in the form of a bitmap or a compressed bitmap. Can be difficult. Further, even if a plurality of language channels are set, character information corresponding to each language channel may not be prepared.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a data reproducing apparatus and a data reproducing method capable of improving the transfer rate of supplementary data of a data recording medium to be reproduced.

The data reproducing apparatus according to the present invention includes language selection means for selecting a desired language from a plurality of languages, an area TOC in which the number of text channels and language codes used in the text channels are managed, main data, and auxiliary data From the recording medium composed of the track area where data is recorded, the reproducing means for reproducing the area TOC and the track area, and auxiliary data reproduced from the track area by the reproducing means are collected and framed. Auxiliary data extracting means for decoding the character channel data composed of flags corresponding to all language channels from the framed auxiliary data frame, and a desired language from a plurality of languages by the language selecting means. When it is detected that the selection has been made, Discriminating means for discriminating the flag of the text channel mapping decoded in the above, and auxiliary data corresponding to a desired language selected from a plurality of languages by the language selecting means is not prepared in the auxiliary data frame However, the above-mentioned problem can be solved by making it possible to display auxiliary data in a language different from the desired language in accordance with the determination result of the flag of the text channel mapping in the determining means .

Since the character information data is selected based on the mapping data determined by the determining means, one character information data can be used by a plurality of language display settings .

The data reproduction method according to the present invention is a recording medium comprising an area TOC in which the number of text channels and language codes used in the text channels are managed, and a track area in which main data and auxiliary data are recorded. Auxiliary data reproduced from the track area is collected and framed, and the text channel mapping composed of flags corresponding to all language channels is decoded from the framed auxiliary data frame to each character information data. When it is detected that a desired language is selected from a plurality of languages, the flag of the decoded text channel mapping is determined, and auxiliary data corresponding to the desired language selected from the plurality of languages is added to the auxiliary language. Even if it is not prepared in the data frame, Text depending on the channel mapping of the flag determination result, to solve the above problems by allowing display the auxiliary data in different languages and the desired language.

A data recording apparatus according to the present invention is a data recording apparatus for recording data on a recording medium in which character information can have a plurality of language display settings , the decoding means for decoding data read from the recording medium, and A discriminating unit for discriminating mapping data in which each character information data has a flag corresponding to the language display setting of all languages from the data decoded by the decoding unit; and the mapping data discriminated by the discriminating unit is rewritten. The above problem is solved by providing rewriting means.

A data recording method according to the present invention is a data recording method for recording data on a recording medium in which character information can have a plurality of language display settings , the decoding step for decoding data read from the recording medium, and A discrimination step of discriminating mapping data in which each character information data has a flag corresponding to the language display setting of all languages from the data decoded by the decoding step; and rewriting the mapping data discriminated by the discrimination step The above problem is solved by providing a rewriting step.

The data recording medium according to the present invention is a data recording medium in which character information can have a plurality of language display settings , and each character information data has a flag corresponding to the language display settings of all languages. The above problem is solved by recording mapping data and selecting character information data based on the mapping data.

The data reproduction apparatus and the data reproduction method according to the present invention reproduce a recording medium in which character information can have a plurality of language display settings , and each character information data has a flag corresponding to the language display settings of all languages. By providing this, one character information data can be used by a plurality of language display settings.

Further, the data recording apparatus and the data recording method according to the present invention are intended to record recording data in which character information can have a plurality of language display settings , and each character information data corresponds to language display settings of all languages. By providing a flag to do so, it is possible to use one character information data by a plurality of language display settings. In addition, when creating one source from a plurality of sources with different language display setting settings , the character information data itself is newly created simply by changing the contents of the flag corresponding to each language display setting included in each character information data. There is no need to record repeatedly.

The data recording medium according to the present invention is a recording medium in which character information can have a plurality of language display settings , and each character information data has a flag corresponding to the language display settings of all languages. One character information data can be used by a plurality of language display settings .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the first embodiment is an optical disc reproducing apparatus 1 which is a specific example of the data reproducing apparatus and data reproducing method of the present invention. In FIG. 1, an optical disc playback apparatus 1 uses a super audio CD standard optical disc directly recording a 1-bit audio signal generated by a DSD type ΔΣ modulator as a playback target. The optical disc playback apparatus 1 plays back audio data read from the Super Audio CD standard optical disc, supplies analog audio signals to the connected left and right speakers 16L and 16R, and outputs acoustic waves. At the same time, supplementary data of audio data such as lyrics and liner notes are displayed on the screen 41 of the display device 40 such as a CRT or LCD.

  The optical disc playback apparatus 1 includes a power switch 31, a disc tray 32, a language selection switch 33, an operation switch group 34 that allows a user to specify commands such as playback and stop, and settings for playback mode and program playback on the front operation panel. A setting switch group 35 is provided to allow the user to perform the operation. Further, an LCD display unit 14 is arranged for displaying a disc name, a song name, etc. described in an area TOC, which will be described later, as character character information.

  The language selection switch 33 includes a Japanese language selection switch 33J, an English language selection switch 33E, a French language selection switch 33F, a German language selection switch 33G,... A Chinese language selection switch 33C.

  As shown in FIG. 2, the optical disk reproducing apparatus 1 includes an optical pickup 3 that reads a recording mark from an optical disk 2 such as a super audio CD, and an RF amplifier that amplifies the signal of the recording mark read by the optical pickup 3 and extracts an RF signal. 4 and a front-end processor unit 5 that performs demodulation processing, error correction processing, and the like on the RF signal from the RF amplifier 4. Further, the decoder 6 for decoding sector data of, for example, 2048 bytes supplied from the front-end processor 5 into audio data or supplementary data, a buffer memory 7 used in the decoding process of the decoder 6, and decoding by the decoder 6 And a D / A converter 8 that converts the audio data into an analog audio signal and supplies the analog audio signal to the amplifier from the output terminal 9. Also, a servo circuit 11 for controlling the objective lens of the optical pickup 3 in the tracking direction and the focus direction, and for controlling the rotational drive of the spindle motor 10 under the control of a spindle motor 10 for rotationally driving the optical disk 2 and a controller 12 described later. And a servo circuit 11 and a controller 12 for controlling each process of the RF amplifier 4, the front-end processor 5 and the decoder 6. The controller 12 connects the operation unit 13 and supplies a control signal according to a language selection instruction, a mode instruction, an operation instruction, or the like by the user to each of the connected units. In addition, the controller 12 connects the display unit 14 and displays the disc title name and the song name decoded by the decoder 6. Note that JPEG data, text data, bitmap data, and the like, which will be described later, recorded in the supplementary data decoded by the decoder 6 are supplied to the display device 40 via the output terminal 15.

  The optical disc 2 directly records a 1-bit audio signal as described above. The 1-bit audio signal is generated by a DSD type ΔΣ modulator 20 as shown in FIG. That is, in this ΔΣ modulator, a difference signal between an input (voice) signal and a 1-bit pulse train is obtained by an adder 22, and the difference signal is integrated by an integrator 23. At this time, an error in the audio band is extracted. The process of converting this signal into a 1-bit pulse output by the quantizer 24 and feeding it back through the 1-sample delay unit 26 is repeated many times. As a result, a 1-bit audio signal is generated.

  In the optical disk reproduction apparatus of FIG. 2, the optical disk 2 rotated by the spindle motor 10 is irradiated with reproduction laser light from the optical pickup 3 and the 1-bit audio signal is read out. This read signal is supplied to the RF amplifier 4. The RF signal from the RF amplifier 4 is supplied to the front end processor unit 5.

  The front-end processor unit 5 uses an external memory (not shown) as a data buffer or a work area during error correction processing, and performs demodulation processing and error correction processing on the RF signal to fix 2048 bytes. Long sector data is generated and supplied to the subsequent decoder 6.

  The decoder 6 receives 2048-byte fixed-length sector data supplied from the front-end processor unit 5 one byte at a time, and analyzes an audio header Audio_Header starting from the head of each sector by an audio header analysis unit described later. The analyzed data is recorded in each block of the buffer memory 7 in units of 1/75 second frames.

  Data recorded in units of frames in each block of the buffer memory 7 is decoded by a compression decoder in the decoder 6 and then fader-processed by a fader as necessary, and then analog audio by a D / A converter 8. The signal is supplied to an external amplifier, a speaker or the like via the output terminal 9.

  The controller 12 discriminates the language channel set in advance from the decoded output from the decoder 6 in the text channel described in the area TOC, and displays it if it matches the language channel selected by the user's operation. The section 14 displays the disc title name and the song name in the selected language. Further, the controller 12 reads the text channel mapping from the supplementary data output from the decoder 6 and displays the language bitmap data or text data selected by the user according to the flag set in the text channel mapping. To display. For this reason, as shown in FIG. 4, the controller 12 functionally includes a determination unit 12a and a control unit 12b.

  The decoder 6 decodes the data read from the optical disk by the optical pickup 3. The determination unit 12a of the controller 12 determines, from the data decoded by the decoder 6, the text mapping data in which each character information data has flags corresponding to all language channels. The control unit 12b selects character information data including sub-pictures or text data from the supplementary data frame based on the text mapping data determined by the determination unit 12a. In particular, the control unit 12b detects a language channel previously selected by the user, and displays the character information data selected based on the text mapping data on the detected language channel. A detailed description of these operations will be given later.

  Here, the structure of the optical disc 2 of the SACD standard will be described with reference to FIG. The area of the optical disc 2 is divided into three areas, ie, a lead-in zone, a data zone, and a lead-out zone in order from the inner periphery to the outer periphery. An information zone is formed by combining these areas.

  The optical disc 2 has, for example, a ROM structure, and data is recorded in units of sectors in a data zone. Each sector has a physical address number (Physical Sector Number), a space of 2064 bytes is prepared per sector, and 2048 bytes of valid data can be recorded in each sector.

  By using a logical address number (Logical Sector Number) starting from 0 instead of a physical address number for this data zone, application data (Application Data) recorded in the volume space (Vorlume Space) is managed. .

  As shown in FIG. 6, the volume space is divided into five areas depending on the use of data. A file system area, a master TOC area, a 2-channel stereo area, a multi-channel area, and an extra data area. The file system area (File System Area) is an area in which a file system is recorded that allows access in consideration of computer use.

  In the SACD standard, a dual TOC structure composed of a master TOC and an area TOC, which basically follows and developed the concept of TOC in CD, is adopted. In the master TOC area, the same master TOC indicating album information and disc information is recorded three times as shown in FIG. The area TOC will be described later.

  In the SCAD standard, not only 2ch stereo but also multi-channel is possible, and two independent areas, the 2-channel stereo area (2-Channel Streo Area) and the multi-channel area (Multi Channel Area) are prepared. As a disc, three combinations of only 2ch stereo, only multichannel, and both 2ch stereo and multichannel are possible. In addition, both the 2ch stereo and multi-channel encoding methods employ a DSD (Direct Stream Digital) recording method, and each channel is always data sampled at 1 bit and 64 Fs (Fs = 44.1 kHz).

  In the volume space, the 2-channel stereo area (2-Channel Streo Area) and the multi-channel area (Multi Channel Area) each have an audio area. For example, in an audio area of a multi-channel area (Multi Channel Area), a track area (Track Area) in which music signals are recorded by a DSD (Direct Stream Digital) recording method, and an area TOC-1 (Area TOC-) before and after the track area are recorded. 1) Area TOC-2 (Area TOC-2) is arranged to store the same data related to area information and track information.

  In the track area, as described above, a music signal by the DSD recording method is recorded, but in reality, audio data (described later) and supplementary data are recorded in an independent state. The audio data is the main data of the music signal. Supplementary data corresponds to a subcode (a signal that can be read in synchronization with a music signal) in a CD, and its data area is secured independently. Audio data is sampled under the same conditions for each channel in order to always maintain a constant quality, while supplementary data can be selected in a scalable manner depending on the application. Applications include still pictures synchronized with sound, sub-pictures such as text or bitmap data.

  Next, detailed configurations of the front-end processor unit 5 and the decoder 6 will be described with reference to FIG. The front-end processor unit 5 includes a sector address continuity detection unit 101, and detects whether or not the sector addresses stored in the external memory are continuous. When the frame data is jumped according to the cue CUE / review REV or music selection operation by the user, the sector address numbers become discontinuous.

  When the sector address continuity detection unit 101 cannot detect the continuity of the sector address, in other words, when the sector address discontinuity is detected, the detection result is supplied to the frame information extraction unit 112 described later via the priority control unit 102. Is done.

  The decoder 6 includes an audio packet extraction unit 103 that extracts an audio packet Audio Packet composed of the audio data with respect to an input b of sector data from an external memory connected to the front-end processor unit 5, and the supplementary data. A supplementary packet extraction unit 108 for extracting a supplementary packet and a frame information extraction unit 112 are prepared in parallel.

  As will be described later, an audio header Audio_Header is stored at the head of each sector. In order to analyze these audio headers, the audio packet extraction unit 103, the supplementary packet extraction unit 108, and the frame information extraction unit 112 are each independently a header analysis unit 103a, 108a, 112a. have.

  In general, frame data is written across a plurality of sectors. Since the audio packet extraction unit 103, the supplementary packet extraction unit 108, and the frame information extraction unit 112 operate independently by reading only the necessary parts, they do not always process the same sector. Therefore, the audio header analysis units 103a, 108a, and 112a are provided for each.

  By the way, in the area (TOC) TOC of the super audio CD, as shown in FIG. 9, information called text channel Text_Channels is recorded. Among these, N text channel N_Text_Channels is the number of text channels Text_Channel used, and has a minimum value of 0 and a maximum value of 8. The language code Code_c [c] is an ISO639 language code used in the text channel Text_Channel c.

  A character code Character_Set_Code [c] shown in FIG. 10 defines a character set used in the text channel Text_Channel c. Code 1 is a description type such as a single-byte character in which one character is represented by 1 byte, and an ISO646 International Reference Version (IRV) is designated. Code 2 and code 7 are also a kind of description such as a single-byte character in which one character is represented by 1 byte, and ISO8859-1 is designated. It is a character used as English. Codes 3 to 6 are description types such as double-byte characters in which one character is represented by 2 bytes. RIS506, Korean KSC, Chinese GB, Big5 are specified.

  Next, the supplementary data is written in a supplementary data packet in the audio sector Audio_Sector as shown in FIG. The audio sector Audio_Sector is composed of 2048 bytes, and as shown in FIG. 12, is composed of an audio header Audio_Header followed by one or more and seven or less packet packets. The structure of the audio header Audio_Header is as shown in FIG. In this, N_Packets is the number of packet packets included in the audio sector Audio_Sector, and N_Frame_Starts is the number of frames starting in the audio sector Audio_Sector. The structure of packet information Packet_Info is shown in FIG. The frame start Frame_Start [p] in the packet information Packet_Info becomes “1” when the p-th packet Packet in the sector Sector is the start of the frame. The data packet Data_Type [p] is the type of the p-th packet. When the value is “2”, the audio packet is an audio packet. When the value is “3”, the supplementary data packet is a supplementary data packet. , “7” is a padding packet. The frame start Frame_Start becomes “1” only when the audio packet is Audio_Packet.

  As shown in FIG. 15, one frame corresponds to the audio packet Audio_Packet whose frame start Frame_Start is “1” to the packet packet immediately before the audio packet Audio_Packet whose frame start Frame_Start is “1”. Among them, a collection of only audio packets Audio_Packet is an audio frame Audio_Frame, and a collection of only supplementary data packets Supplementary_Data_Packet is a supplementary data frame Supplementary_Data_Frame.

  The supplementary data frame Supplementary_Data_Frame is divided into a plurality of SD (Supplementary Data) units SD_Unit. At the beginning of each SD unit SD_Unit, as shown in FIG. 16, there are an SD type SD_Type, an IU (Information Unit) start IU_Start, an IU end IU_End, and an SD length SD_Length. SD_Type is the data type of SD_Data included in this SD_Unit. When the value is “1”, it indicates JPEG_Picture, when it is “2”, it indicates sub-picture Sub_Picture, and when it is “3”, it indicates text Text. . JPEG_Picture is JPEG-compressed data of landscapes, people, etc., and does not depend on the language. On the other hand, Sub_Picture is a run-length-compressed character written in a bitmap, and Text is a character string that represents a character string by arranging character codes, both of which depend on the language. For a certain SD_Type, when SD_Data from SD_Unit whose IU_Start is “1” to SD_Unit whose IU_End is “1” is connected, data for constituting one screen of that SD_Type is obtained. This is called an information unit Information_Unit.

  As shown in FIG. 16, when IU_Start is “1” and SD_Type is Sub_Picture or Text, 8-bit data called text channel mapping Text_Channel_Mapping is provided. Each bit of the text channel mapping Text_Channel_Mapping corresponds to the Text_Channel defined by the text channel Text_Channels of the area / TOC as shown in FIG. That is, when Ch [n] is “1”, this indicates that this information unit Information_Unit is used for the text channel Text_Channel n. Text channel mapping Text_Channel_Mapping is configured by providing each character information data with flags corresponding to all language channels, and by describing this, character information data consisting of one sub-picture data, for example, Can be used by multiple language channels.

  T_Sub_Type described following the text channel mapping Text_Channel_Mapping indicates a sub-picture and a fine type in the text. For example, it indicates lyrics or liner notes. The page number Page_Nr indicates the page number when the sub-picture is a liner note and may extend over a plurality of pages.

  P_Ref specifies a JPEG image to be output together with the sub-picture. Using this P_Ref, a slide show of JPEGs with sub-pictures inserted can be performed. This slide show will be described later.

  Described after P_Ref is the number of pages Nm_Pages. This indicates how many pages in total. As described above, a liner note covers a plurality of pages but represents the total number of pages. After the number of pages Nm_Pages, the supplementary data SD itself is described as SD_Data.

  An outline of the operations of the front-end processor unit 5 and the decoder 6 shown in FIG. 8 will be described below. As shown in FIG. 13, the audio header describes the type and length of each packet included in the sector, information on whether or not the packet is the head packet, and the like. In particular, N_Sectors indicating the number of sectors used in the frame is described in the frame information Frame_Info. The header analysis units 103a, 108a, and 112a analyze these audio headers.

  The audio packet extraction unit 103 is connected to the audio data FIFO register 104. The audio data FIFO register 104 is connected to a compression decoder 105, and the compression decoder 105 is further connected to a fader 106.

  The supplementary packet extraction unit 108 is connected to the supplementary FIFO register 109. The supplementary FIFO register 109 is connected to the supplementary data interface unit 110. The frame information extraction unit 112 is connected to the fader 106.

  In addition, the decoder 6 includes a priority control unit 102 and gives priority to the data request signals d1, d2, and d3 output from the audio packet extraction unit 103, the supplementary packet extraction unit 108, and the frame information extraction unit 112 according to circumstances. A rank is assigned, and the sector number and byte address c1, c2, c3 from any one extraction unit are selected, and the memory read address a is output.

  Details of the operations of the front-end processor unit 5 and the decoder 6 shown in FIG. 8 will be described below. First, the audio packet extraction unit 103 reads only the audio packet data from the buffer memory 7 while analyzing the audio header by the header analysis unit 103a. In other words, from the contents of the audio header of the sector currently targeted, the type and length of each packet included in the sector, information on whether or not it is the head packet of the frame is analyzed, and the audio packet data in the sector is Calculate the byte address that indicates where it is written.

  This byte address and the sector number of the currently targeted sector are output, and the byte address is controlled so that packets other than audio packets are skipped.

  If the first packet of the next frame is not found even after reading all the audio packet data contained in the target sector, the sector number is incremented to set the next sector as the target sector, and the audio header of the new target sector is analyzed. After that, it continues to read the audio packet data. When all the audio packet data up to the first packet of the next frame has been read, the process waits until the next frame starts.

  The priority control unit 102 selects the data request d1 of the audio packet extraction unit 103, and the data actually read from the buffer memory 7 is stored in the audio data FIFO register 104. The subsequent compression decoder 105 takes in the valid data stored in the audio data FIFO register 104 when necessary.

  By skipping the supplementary packet, padding packet, and stuffing data, the compression decoder 105 can receive the data of the necessary audio frame with almost no waiting even if there is no buffer memory in the frame state.

  The number of stages of the audio data FIFO register 104 is sufficient as long as data can be supplied to the compression decoder 105 while the audio packet extraction unit 103 analyzes the audio header when moving the read target sector to a new sector. In this case, the number of times the audio header is analyzed is limited. Therefore, the minimum number of stages may be prepared in consideration of this.

  The supplementary packet extraction unit 108 reads only the data of the supplementary packet from the buffer memory 7 while analyzing the audio header by the header analysis unit 108a. From the contents of the audio header of the sector currently targeted, the type, length, and whether or not the packet is the first packet of the frame are detected, and supplementary packet data is written in the sector. Calculate the byte address that indicates the location. This byte address and the sector number of the currently targeted sector are output, and the byte address is controlled so that packets other than the supplementary packet are skipped.

  Even if all the supplementary packet data contained in the target sector is read, if the first packet of the next frame is not found, the sector number is incremented to set the next sector as the target sector, and the audio header of the new target sector is analyzed. After that, it continues reading supplementary packet data. When all the supplementary packet data up to the first packet of the next frame has been read, the process waits until the next frame starts.

  The priority control unit 102 selects the data request d2 of the supplementary packet extraction unit 108, and the data actually read from the buffer memory 7 is stored in the supplementary data FIFO register 109. If there is valid data in the supplementary data FIFO register 110, the supplementary data interface unit 110 at the subsequent stage reads it and outputs it to the outside via the output terminal 111.

  With respect to the external output of supplementary data, the supplementary data FIFO register 109 is unnecessary if there is no particular timing restriction.

  The frame information extraction unit 112 constitutes a frame Fn + 1 next to the frame Fn currently processed by the audio packet extraction unit 103 and the supplementary packet extraction unit 108 while analyzing the audio header by the header analysis unit 112a. It is checked whether all sectors are prepared in the buffer memory 7 and whether error data is included. Further, the frame information extraction unit 112 determines whether or not the sector data stored in the buffer memory 7 is the last data of the last frame that has been recorded in the buffer memory 7 from the extracted frame information.

  Further, the frame information extraction unit 112 receives the detection result that the sector address is discontinuous from the sector address continuity detection unit 101 via the priority control unit 102. Then, the frame information extraction unit 112 determines that when all the sectors constituting the frame Fn + 1 next to the currently processed frame Fn are not prepared in the buffer memory 7 or when an error frame is included, When the data is the last data of the last frame, and when the sector address is discontinuous, the error signal e is supplied to the fader unit 106, and the DSD decode signal from the compression decoder is faded.

  Next, based on the configuration and operation of each unit described so far, how the optical disc playback apparatus 1 performs in the connection-related system shown in FIG. 1 will be described as some operation examples.

  First, a first operation example will be described with reference to FIG. In the first operation example, the music data 60 of the track 1 of the optical disc 2 of the Super Audio CD standard is reproduced, and at the same time, the lyrics recorded in the supplementary data frame are also displayed on the display device 40 of FIG. Is.

  For example, in the text channel Text_Channels shown in FIG. 9 in the area TOC, “text channel Text_Channel 1: English, text channel Text_Channel 2: Japanese, text channel Text_Channel 3: French” is preset (step 61). To do. For the song name of the track 1, English, Japanese, and French character sets are prepared and can be displayed on the display unit 14 in accordance with the selection by the user of the language selection switch 33 on the front panel shown in FIG.

  However, in the Supplementary Data Frame Supplementary_Data_Frame, only the sub-picture Sub_Picture of the lyrics written in English and the sub-picture Sub_Picture of the lyrics written in Japanese are prepared (steps 62 and 63). Assume that the sub-picture Sub_Picture written in French has not been prepared. At this time, if the value of the text channel mapping Text_Channel_Mapping of the English sub-picture Sub_Picture is set to “00000101” (step 64), the text channel Text_Channel is set to French as described above, and the French language is set by the user. Even if the selection switch 33F is selected, at least English lyrics can be displayed on the display device 40. At this time, the display device 40 may display an image by JPEG.

  In performing the operation with reference to FIG. 18, the decoder 6 and the controller 12 shown in FIG. 4 operate as follows. First, the decoder 6 decodes the text channel Text_Channels of the area TOC. Further, the decoder 6 generates a supplementary data frame while storing the supplementary packet in the buffer memory 7 by the supplementary packet extraction unit 108 shown in FIG. The discriminating unit 12a of the controller 12 discriminates and extracts, for example, a sub-picture of English lyrics from the decoded output of the decoder 6. When the controller 12 detects that the French selection switch 33F is operated by the user, the controller 12a determines that the value of the text channel mapping Text_Channel_Mapping is “00000101” by the determiner 12a, and the determined result is the controller 12b. Send to. The control unit 12b displays a sub-picture of English lyrics on the display device 40.

  There has never been a concept of using a text channel mapping Text_Channel_Mapping. For this reason, for example, when only the lyrics written in English are prepared in the supplementary data frame, the same English is displayed in full-width as shown in FIG. 19 in case the Japanese language selection switch 33J is pressed. I had to prepare the lyrics. This makes it impossible to increase the disk transfer rate.

  FIG. 20 shows a display example when the user operates the English selection switch 33E in the situation shown in FIG. 18 as a second operation example. On the display unit 14 on the front operation panel of the optical disc playback apparatus 1, the title name of the optical disc according to the ISO 8859 character set code Character_Set_Code is displayed in English (Language code: EN). The display device 40 displays the JPEG still image 40b from the supplementary data frame Supplementary_Data_Frame and the English lyrics 40a. The English lyrics 40a are based on the sub picture Sub_Picture.

  Next, an example (third operation example) in which Japanese subtitles or lyrics are expressed in standard words and dialects by an irregular use of the text channel mapping Text_Channel_Mapping will be described with reference to FIG. Assume that text channel mapping Text_Channel_Mapping is specified as EN, CN, FR, EN, JN4, JN3, JN2, and JN1 from ch [1] to ch [8]. JN1 specifies the standard Japanese language, but JN2, JN3, and JN4 specify different dialects. In the supplementary data frame Supplementary_Data_Frame, lyrics sub-pictures Sub_Picture written in English and lyrics sub-pictures Sub_Picture written in Japanese standard words and dialects are prepared. There are no lyrics for foreign languages other than English. At this time, if the text channel mapping Text_Channel_Mapping is set to “00001111” as shown in FIG. 21A, even if the French language selection switch 33F is selected by the user, at least English lyrics are displayed on the display device 40. Can be displayed. Even if the Chinese language selection switch 33C is selected by the user, at least English lyrics can be displayed on the display device 40.

  Further, when the text channel mapping Text_Channel_Mapping is set to “10000000” as shown in FIG. 21B, when the Japanese language selection switch 33J is selected by the user, the standard Japanese lyrics are displayed. be able to. Further, when “01000000” is set as shown in FIG. 21C, when the Japanese language selection switch 33J is selected by the user, the Japanese lyrics of the dialect are displayed. As shown in FIG. 21 (d), when “11110000” is set, JN1 is given priority and the standard Japanese lyrics are displayed. Further, when the language selection switch 33 supports JN4, JN3, JN2, and JN1 of each Japanese language, the standard selected by the user by using the text channel mapping Text_Channel_Mapping in FIG. You can also display Japanese lyrics in words and dialects.

  Next, a second embodiment will be described. The second embodiment is an optical disk recording apparatus 50 that is a specific example of the data recording apparatus and data recording method of the present invention. In FIG. 22, the optical disk recording device 50 is created by an operator via an operation unit into main data consisting of a 1-bit digital signal obtained by subjecting an audio signal supplied from an input terminal 52 to ΔΣ modulation processing. The supplementary data is multiplexed and recorded on the signal recording device of the optical disk 51 by, for example, an optical head to create an SACD standard optical disk. The 1-bit digital signal handled by the optical disc recording apparatus 50 is also generated at a sampling frequency 64 fs that is 64 times the sampling frequency fs (44.1 kHz) used for a compact disc, for example.

  Therefore, the optical disc recording apparatus 50 includes a ΔΣ modulator 53 that generates the 1-bit digital signal, an encoder 54 that encodes the 1-bit digital signal, a supplementary data generation unit 61 that generates supplementary data, A multiplexer 55 is provided for multiplexing and packetizing the 1-bit digital data and the supplementary data. In addition, a drive unit 56 that drives the laser element of the optical head 57 according to the multiplex output, the optical head 57, and a spindle motor 63 that rotationally drives the optical disk are provided. Further, an operation unit 59 operated by an operator, a display unit 58 that displays an operation status, and the like, and a controller that controls the supplementary data generation unit 61 in response to an operation on the operation unit 59 and generates supplementary data. 60. The controller 60 also supplies control signals to the display unit 58, the ΔΣ modulator 53, the multiplexer 55, and the drive unit 56, and controls the processing. The controller 60 controls the focusing and tracking of the optical head 57 via the servo circuit 62. Further, the rotational speed of the spindle motor 63 is also controlled.

  The ΔΣ modulator 53 converts the audio signal into a 1-bit digital signal with the configuration shown in FIG. This 1-bit digital signal is DSD or DST encoded by the encoder 54 and supplied to the multiplexer 55.

  The supplementary data generation unit 61 generates, for example, lyrics of music data or liner notes of albums as sub-pictures in Japanese, English, etc., according to commands operated by the operator via the operation unit 59. Alternatively, it is generated as text. An image may be generated by JPEG. The supplementary data generated by the supplementary data generation unit 61 is also supplied to the multiplexer 55.

  The multiplexer 55 packetizes music data consisting of 1-bit audio data as main data and supplementary data as auxiliary data of the music data, and then forms a sector of 2048 bytes. The drive unit 56 drives the optical head 57 so that main data, auxiliary data, and the like are recorded on the optical disc 51 in units of sectors.

  As described above, the optical disk recording apparatus 50 can record the audio data string as the main data and the sub-picture data, the text data, or the JEPG image data as the supplementary data on the optical disk in association with the main data.

  Further, the above text channel mapping Text_Channel_Mapping is configured by adding flags corresponding to all language channels to each character information data in SD_Unit in the supplementary data file already described with reference to FIGS. In this way, a plurality of language channels can use one piece of character information data, for example, sub-picture data.

  Hereinafter, some examples of the operation of the optical disc recording apparatus 50 will be described. First, with reference to FIGS. 23 and 24, a first operation example for producing a new disk 3 by selecting several songs from the two disks 1 and 2 will be described. However, the optical disk recording apparatus 50 copies the sector data before decoding output from the front end processor unit 5 of the optical disk reproducing apparatus 1 having the configuration shown in FIG. Shall be recorded. Further, at this time, the optical disc recording apparatus 50 rewrites the value of the text channel mapping Text_Channel_Mapping of the sub picture Sub_Picture via the supplementary data generation unit 61.

  There is a disk 1 that is set to the text channel Text_Channel 1: English and Text_Channel 2: Japanese (step 80), and the value of the text channel mapping Text_Channel_Mapping of the English sub-picture Sub_Picture is “00000001” (step 81). The value of Text_Channel_Mapping of the Japanese sub-picture Sub_Picture is “00000010” (step 82).

  Further, there is a disk 2 in which the text channel Text_Channel 1: English and Text_Channel 2: French are set (step 83), and the value of the text channel mapping Text_Channel_Mapping of the English sub-picture Sub_Picture is “00000001” (step 84). ), The value of the text channel mapping Text_Channel_Mapping of the French sub-picture Sub_Picture is “00000010” (step 85).

  When several discs are selected from each of the disc 1 and the disc 2 and a new disc 3 is produced, as shown in FIG. 24, the text channel Text_Channels of the disc 3 is changed to Text_Channel 1: English, Text_Channel 2: Japanese. Text_Channel 3: French is set (step 86).

  The text channel mapping of the English sub-picture Sub_Picture of the song selected from the disc 1 is “00000101” (step 87), the Japanese sub-picture Sub_Picture text channel of the song selected from the disc 1 The value of the mapping Text_Channel_Mapping only needs to be “00000010” (step 88), and it is not necessary to write the English sub-picture Sub_Picture into the disk 3 again for Text_Channel 3.

  Similarly, the text channel mapping Text_Channel_Mapping of the English sub-picture Sub_Picture of the song selected from the disc 2 is “00000011” (step 89), and the French sub-picture Sub_Picture text of the song selected from the disc 2 The value of the channel mapping Text_Channel_Mapping may be “00000100” (step 90).

  Next, with reference to FIG. 25, a process (second operation example) in which one track is picked up from each of the two disks 91 and 92 and placed in the French-specification disk 93 will be described. The optical disk 91 is set to text channel Text_Channel 1: English. The value of the text channel mapping Text_Channel_Mapping of the English sub picture Sub_Picture is “00000001”. The optical disc 93 is set to text channel Text_Channel 2: French. The value of the text channel mapping Text_Channel_Mapping of the French sub picture Sub_Picture is “00000010”.

  When the track Tr1 of the optical disc 91 and the track Tr2 of the optical disc 92 are put into the French-spec optical disc 93, the value of the text channel mapping Text_Channel_Mapping of the track Tr1 of the optical disc 91 is set to “00000011”. When the track Tr1 is selected on the French optical disc 93, English lyrics are displayed. In this case, conventionally, English lyrics had to be recorded again on the optical disc 93 as a sub-picture, but here, it is only necessary to rewrite the value of the text channel mapping Text_Channel_Mapping, and the storage capacity is reduced. Therefore, the transfer rate can be improved.

  Next, a third embodiment will be described. The third embodiment is a modification of the optical disc playback apparatus 1. The optical disc playback apparatus 1 uses music data composed of 1-bit audio signals as main data, and for example, lyrics and subtitles as supplementary data. The optical disc reproducing apparatus of the third embodiment records a plurality of still images such as photographs as main data, and the main data and sub-pictures of supplementary data are simultaneously displayed on the display device 40. You can display and do a slideshow.

  The P_Ref shown in FIG. 16 designates a JPEG image to be output together with the sub-picture. Therefore, a slide show of JPEG with the sub-picture inserted is performed using P_Ref. FIG. 26A shows an example in which a JPEG image desired to be output together with a sub picture is a background picture BGP, and the sub picture is inserted therein. For example, three types of A, B, and C sub-pictures can be included in the background picture as shown in FIG. A title can be inserted as a sub-picture in the background picture as shown in FIG. 26C, or a liner note can be inserted as shown in FIG. In these cases, titles, liner notes, or lyrics can be shared by multiple text channels by simply changing the value of the text channel mapping Text_Channel_Mapping according to the text channel of the area TOC. . Therefore, the amount of data on the disk can be reduced, and the data transfer rate can be improved.

  A specific example of the data recording medium according to the present invention is an SACD standard optical disc that records the main data described above and auxiliary data describing the text channel mapping Text_Channel_Mapping. Furthermore, DVD and MD can be taken as specific examples. In addition to the main data, packetized data itself composed of auxiliary data describing text channel mapping Text_Channel_Mapping may be used as a specific example. Therefore, the data reproducing device and the data recording device can be applied to a reproducing device for reproducing packetized data and a recording device for recording.

  As described above, the data reproduction apparatus and the data reproduction method according to the present invention have one sub-picture Sub_Picture or text Text corresponding to only the language channels set in the text channel Text_Channels. Data of sub picture Sub_Picture or text Text can be shared by a plurality of text channels Text_Channel, and the amount of data on the disk can be reduced. In particular, a large number of text channels Text_Channel can be handled within a limited transfer rate.

  In the data recording apparatus and the data recording method according to the present invention, when a new disc is created from two disc sources having different settings of the text channel Text_Channels, each sub-picture Sub_Picture or text Text information unit Information_Unit It is only necessary to change the channel mapping Text_Channel_Mapping, and there is no need to make a new copy of the information unit Information_Unit itself.

  In the data recording medium according to the present invention, when there is no sub-picture Sub_Picture or text Text corresponding to a language channel only set by the text channel Text_Channels, a plurality of pieces of data of one sub-picture Sub_Picture or text Text are stored. The text channel Text_Channel can be shared, and the amount of data can be reduced. In particular, a large number of text channels Text_Channel can be handled within a limited transfer rate. Also, when creating a new medium from two media with different settings for the text channel Text_Channels, it is only necessary to change the text channel mapping Text_Channel_Mapping of the information unit Information_Unit of each sub-picture Sub_Picture or text Text.・ There is no need to create a new copy of the unit Information_Unit.

1 is a diagram showing a system including an optical disc reproducing device according to a first embodiment of the present invention and peripheral devices thereof. It is a block diagram of an optical disk reproducing device. It is a block diagram of a 1-bit ΔΣ modulator. It is a block diagram of the principal part of an optical disk reproducing device. FIG. 2 is a structural diagram of an optical disc of the Super Audio CD standard. It is a figure which shows the volume space of the optical disk of a super audio CD standard. It is a figure which shows the correspondence of TOC of an optical disk of a super audio CD standard, and information. It is a detailed block diagram of the front end processor part and decoder of an optical disk reproducing device. It is a figure which shows the syntax of a text channel. It is a figure which shows the definition of a character set. It is a figure which shows the relationship between an audio sector and a packet. It is a figure which shows the syntax of an audio sector. It is a figure which shows the syntax of an audio header. It is a figure which shows the syntax of packet information. It is a figure which shows an audio frame and a supplementary data frame. It is a figure which shows the syntax of SD unit. It is a figure which shows a text channel mapping. It is a figure for demonstrating the 1st operation example of an optical disk reproducing | regenerating apparatus. It is a figure for demonstrating the operation example of the conventional optical disk reproducing | regenerating apparatus. It is a figure for demonstrating the 2nd operation example of an optical disk reproducing device. It is a figure for demonstrating the 3rd operation example of an optical disk reproducing device. It is a block diagram of the optical disk recording device of the 2nd Embodiment of this invention. FIG. 10 is a first diagram for explaining a first operation example of the optical disc recording apparatus. FIG. 10 is a second diagram for explaining the first operation example of the optical disc recording apparatus. It is a figure for demonstrating the 2nd operation example of an optical disk recording device. It is a figure for demonstrating operation | movement of the optical disk reproducing device of the 3rd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Optical disk reproducing apparatus, 2 Optical disk, 5 Front end processor, 6 Decoder, 12 Controller, 12a Discriminating part, 12b Control part, 13 Operation part, 14 Display part, 16L, 16R Speaker, 40 Display apparatus, 50 Optical disk recording apparatus, 55 Multiplexer, 59 operation unit, 60 controller, 61 supplementary data generation unit

Claims (4)

Language selection means for selecting a desired language from a plurality of languages;
The area TOC and the track area are reproduced from a recording medium including an area TOC in which the number of text channels and the language code used in the text channel are managed, and a track area in which main data and auxiliary data are recorded. Playback means to
Auxiliary data reproduced from the track area by the reproducing means is collected and framed, and a text channel mapping comprising flags corresponding to all language channels from the framed auxiliary data frame to each character information data. Auxiliary data extraction means for decoding;
When the language selection means detects that a desired language has been selected from a plurality of languages, it comprises a determination means for determining a text channel mapping flag decoded by the auxiliary data extraction means,
Even if auxiliary data corresponding to a desired language selected from a plurality of languages by the language selection unit is not prepared in the auxiliary data frame, according to the determination result of the flag of the text channel mapping in the determination unit, A data reproducing apparatus capable of displaying auxiliary data in a language different from a desired language . 2. A display unit for displaying auxiliary data in a language different from a desired language selected from a plurality of languages by the language selection unit according to a determination result of a flag for text channel mapping in the determination unit. The data reproducing apparatus described. The data reproducing apparatus according to claim 1 , wherein the auxiliary data is lyrics . Auxiliary data reproduced from the track area of a recording medium consisting of an area TOC in which the number of text channels and language codes used in the text channel are managed, and a track area in which main data and auxiliary data are recorded And the text channel mapping composed of flags corresponding to all language channels in each character information data from the framed auxiliary data frame,
When it is detected that a user selects a desired language from a plurality of languages, the decoded text channel mapping flag is determined, and auxiliary data corresponding to the desired language selected from the plurality of languages is A data reproduction method capable of displaying auxiliary data in a language different from a desired language in accordance with the determination result of the flag of the text channel mapping even if the auxiliary data frame is not prepared .

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