JP2005094276A - Optical disk reproducing apparatus and optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk reproducing apparatus which can change to a different type of font in an on-screen display even if a plurality of fonts having different types are intermingled on one disk. <P>SOLUTION: The optical disk reproducing apparatus stores font data and font data management information incidental to the font data used to on-screen display in a rewritable nonvolatile flash memory 11, judges the management information, and switches a method for displaying the font data. The optical disk reproducing apparatus can display on the screen with user's desired font, such as not only a bit map font but also an outline font, etc. corresponding to a plurality of types of the front displays, for example, a title display and a menu display. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical disc playback apparatus and an optical disc that play back video and audio information recorded on an optical disc, and relates to an optical disc playback device that has an on-screen display function.

  Conventionally, digital data obtained by encoding / compressing a video signal or an audio signal is recorded on a recording medium such as an optical disc, and the data is read from the recording medium and reproduced. One such optical disc is a DVD (Digital Versatile Disk).

  In addition to video data such as movies, a DVD includes a plurality of audio information corresponding to a plurality of languages (for example, original audio data, dubbed audio data thereof, commentary sound of a movie director), and a plurality of sub-image information (for example, Subtitle data in a plurality of languages) is recorded, the language of the audio data to be reproduced on the menu screen and the language of the subtitles to be displayed are selected and set in the reproduction device, and the data in the selected language can be reproduced. (For example, see Patent Document 1). There is also a DVD in which menu data is recorded, and regarding the display of this menu, it is possible to select a language to be used for display from a plurality of languages.

  In a playback apparatus that plays back an optical disk such as a DVD, on-screen display of characters is performed in the menu display. The characters in the language displayed on the screen are determined by a character font provided in the playback apparatus. In order to suppress an increase in cost due to an increase in font memory, normally only one type of font data is provided, and the menu display language in the playback apparatus cannot be changed.

  In response to this, each disk has font data, the playback device has a rewritable font data storage memory, and the font data on the disk is stored in the playback device memory, thereby suppressing an increase in cost. There is a method for increasing the types of character fonts (see, for example, Patent Document 2).

  On the other hand, in the case of movie subtitles, as in the on-screen display of characters in menu display, the subtitle characters displayed on the screen are determined by the character font stored on the optical disc. In order to enable display in various character fonts, it is necessary to provide data for that number of character fonts, and in order to provide a plurality of character font data, a large amount of disk capacity is required. For this reason, normally only one type of font data is provided, and the font for displaying the subtitles cannot be changed.

  A DVD stores a plurality of audio data and a plurality of sub-image data corresponding to a plurality of languages, together with video data, in a limited disk capacity. Although there was a trade-off relationship with recording time, when it comes to the next generation optical disc of DVD, it is expected that the capacity per disc will improve dramatically and it will also be common to have multiple font data Is done.

  At the same time, it is expected that different types of font data can be stored on a single disc by expanding the disc capacity.

  Different types of font data include bitmap fonts used on DVDs and the like, and outline fonts (such as true type fonts) using vector data. Compared to bitmap fonts, these fonts have the advantage that even if the font size is enlarged, the characters are not jagged and smooth, and high-quality display is possible regardless of the display resolution. Many types of fonts are popular.

JP-A-8-263969

JP 2001-357665 A

  However, currently popular DVDs employ only bitmap fonts as subtitle font data, and other fonts are not used. For this reason, it is expected that a next-generation optical disc will require a new mechanism for handling various types of fonts.

  The present invention has been made in view of such points, and even when a plurality of different types of fonts are mixed on a single disc, it is possible to cope with changes between different types of fonts in on-screen display. An object of the present invention is to provide an optical disk reproducing device and an optical disk.

  An optical disc reproducing apparatus according to a first aspect of the present invention is an optical disc reproducing apparatus that reads and reproduces data from an optical disc on which video data is recorded, and is a rewritable nonvolatile memory that holds font data used for on-screen display. Font memory, on-screen display means for performing on-screen display using font data stored in the font memory, input means for capturing font data to be written to the font memory, and input means Temporary storage means for temporarily storing the font data, control means for writing the font data stored in the temporary storage means to the font memory, and switching the display method by determining the font data management information associated with the font data Featuring font switching means .

  According to a second aspect of the present invention, there is provided an optical disk reproducing apparatus according to the first aspect of the invention, wherein the program for writing the font data stored in the temporary storage means into the font memory is fetched together with the font data by the input means. It is characterized by.

  According to a third aspect of the present invention, there is provided an optical disk reproducing apparatus according to the first or second aspect, wherein the input means is a reading means for reading data from the optical disk.

  According to a fourth aspect of the present invention, there is provided the optical disk reproducing apparatus according to the first or second aspect, wherein the input means is a communication means to which a communication line is connected.

  According to a fifth aspect of the present invention, there is provided the optical disk reproducing apparatus according to the first or second aspect, wherein the font switching means is a bitmap font / outline font switching means.

  An optical disc according to a sixth aspect of the present invention is an optical disc reproduced by the optical disc reproducing apparatus according to the first or second aspect, and has a plurality of different types of font data for on-screen display.

  An optical disk reproducing apparatus according to a seventh aspect of the present invention is an optical disk reproduced by the optical disk reproducing apparatus according to the sixth aspect, wherein the plurality of different types of font data are a bitmap font and an outline font. And

  An optical disc according to an eighth aspect of the present invention is an optical disc reproduced by the optical disc reproducing apparatus according to the first or second aspect, and has management information indicating the type of font data stored in the optical disc.

  An optical disk reproducing apparatus according to a ninth aspect of the present invention is an optical disk reproducing apparatus that reads and reproduces data from an optical disk on which video data is recorded, and is a rewritable nonvolatile memory that holds font data used for on-screen display. Font memory, on-screen display means for performing on-screen display using font data stored in the font memory, input means for capturing font data to be written to the font memory, and input means Temporary storage means for temporarily storing the font data, control means for writing the font data stored in the temporary storage means into the font memory, and determining the font data management information associated with the font data to determine the font data as a font To determine whether to store in the memory Characterized in that it comprises a chromatography determination means.

  An optical disk according to a tenth aspect of the present invention is an optical disk that is played back by the optical disk playback device according to the ninth aspect, and has data as a condition for storing font data in a font memory.

  According to the present invention, it is possible to perform on-screen display, for example, subtitle display or menu display, in a font desired by the user such as an outline font as well as a bitmap font. Further, it is sufficient to provide the playback device with a memory having a capacity for storing one type of font data, which does not cause an increase in cost. Therefore, an optical disc playback device that can be inexpensively adapted to the use conditions of the user is provided. Can do.

  FIG. 2 is a schematic configuration diagram of an optical disk reproducing apparatus according to an embodiment of the present invention. As the optical disk, for example, a next-generation optical disk such as a DVD is used.

  Reference numeral 1 denotes an optical disk as a recording medium, on which presentation data consisting of program data including video data (information) and audio data, which is the main playback purpose of movies and the like, is recorded, and is further displayed on the video data image. Sub-picture display data including information such as sub-picture data of the sub-picture to be displayed and position information displayed by the sub-picture is recorded.

  2 is a reading unit for reading data from the optical disc 1, 3 is a signal amplifying unit for amplifying a signal from the reading unit 2, 4 is a driving unit for rotating the optical disc 1, 5 is focus, tracking, slave control and driving in the reading unit 2 A drive circuit for controlling the drive of the unit 4, and a DSP servo circuit for outputting various signals read from the optical disc 1 as digital data according to the output signal from the signal amplifying unit 3 and controlling the drive circuit 5 for various servo controls It is.

  A disk drive block as a reading means for reading data from the optical disk 1 from the reading unit 2, the signal amplification unit 3, the driving unit 4, the drive circuit 5, and the DSP servo circuit 6 is configured.

  7 analyzes the digital data output from the DSP servo circuit 6 and separates the data according to the data type such as video data and audio data or font data, and selectively selects the separated data according to the control of the control circuit described later. A demultiplexer for output, 8 is a video decoding unit as video output means for decoding compressed video data and outputs a video signal, and 9 is appropriately input with data related to a sub-picture under the control of a control circuit described later. A sub-picture decoding unit 10 for decoding by the decoding means and outputting as a video signal is an audio decoding unit for decoding the audio data output from the demultiplexer 7 into an audio signal, and is an acoustic device (not shown) having a built-in D / A converter Audio signal is output to The D / A converter may be configured to be connected to the output end thereof and configured separately from the speech decoding unit when the output from the speech decoding unit is not analog signals but digital data. Absent. The sub-image decoding unit 9 has a plurality of decoding means such as a bitmap font decoding means and an outline font decoding means.

  11 is a rewritable and non-volatile flash memory (FLASHROM) in which font data for on-screen display and a control program by a control circuit to be described later are stored (the storage area of the font data is determined in advance and the area portion) Is equivalent to a font memory), 12 is an SDRAM as temporary storage means for temporarily storing font data for rewriting, and 13 is a composite of video signals output from the video decoding unit 8 and the sub-image decoding unit 9, respectively. And further, an on-screen display (OSD) is generated as necessary in accordance with control of a control circuit described later, and this OSD is combined with the previous video signal and output as a mixer. The video signal output from the mixer 13 is supplied to a display (not shown). Which is displayed based on.

  Reference numeral 14 denotes a control circuit that controls the entire apparatus according to a program stored in the flash memory 11, and controls data rewriting of the flash memory 11, and receives the video data, audio data, and sub-picture display data separated by the demultiplexer 7. Selection setting operation to be output to a predetermined decoder, control operation in the signal amplifying unit 3 and DSP servo circuit 6 and coefficient setting therefor, control of decoding operation in the video decoding unit 8 and sub-image decoding unit 9, and on-screen in the mixer 13 Perform display control including display control. Further, control is performed to switch fonts based on font data management information attached to the font data.

Reference numeral 15 denotes an input device for a user to give a control instruction to the control circuit 14, which is composed of, for example, a plurality of keys, or receives a signal from a remote controller and decodes the signal as an input instruction signal. 14 is provided.
A communication means 16 is connected to a communication line and takes in font data for rewriting from the outside of the reproducing apparatus, and is, for example, a modem or a LAN terminal.

  In such an apparatus, reproduction of video / audio from the optical disc 1 is performed as follows.

  First, reading of a program from the optical disc 1 is started in a state where the optical disc 1 is mounted on the playback device. That is, the optical disk 1 is rotated by the drive unit 4 under the control of the DSP servo circuit 6, and the focus, tracking, and thread control of the reading unit 2 is performed, according to the data recorded by the reading unit 2 from the optical disk 1. The digital signal based on the detected signal is input to the demultiplexer 7. The demultiplexer 7 separates the video data, sub-picture data and audio data from the read digital data, the video data is sent to the video decoding unit 8, the sub-picture data is sent to the sub-image decoding unit 9, and the audio data is sent to the audio data. Output to the decoding unit 10.

  Under the control of the control circuit 14, the video decoding unit 8 decodes the video data and outputs a video signal, and the sub-picture decoding unit 9 outputs a sub-picture display instruction and a sub-picture display language from the control circuit 14. In accordance with the selection instruction and the font information indicating the type of sub-picture, the decoding method is switched, the data relating to the sub-picture is decoded, and the video of the sub-picture data in the display language selected at the position indicated in the position information The video signal of the sub picture is output so that (for example, English) is displayed.

  The video signal output from the video decoding unit 8 and the video signal output from the sub-image decoding unit 9 are mixed and combined by the mixer 13 and output as one video signal. On the input display, an image obtained by combining the image of the selected sub-picture with the image of the image data is reproduced and displayed. Also, the audio data input to the audio decoding unit 10 is decoded into an audio signal, and the audio signal is supplied to an acoustic device (not shown) to reproduce and output audio based on the audio data.

  Further, the control circuit 14 supplies character string data to be displayed using the font data of the flash memory 11 to the mixer 13, and the mixer 13 generates an on-screen display video signal. On-screen display is performed in which the video signal output from the video decoding unit 8 or the video signal output from the sub-image decoding unit 9 is combined and output as one video signal.

An example of the font data attribute attached to the font data is shown in FIG.
FIG. 1 is a diagram schematically showing font data recorded on an optical disk and font management information associated with the font data. 311 is display character information, 312 is font information, and 313 is font data.

  The display character information 311 will be described in detail. 321 is a display flag, 322 is the number of fonts, 323 is a display priority, 324 is a font type, 325 is a copy permission attribute, and 326 is a use restriction attribute. Reference numeral 327 is a restriction content. The display flag 321 is a flag indicating which one of the fonts installed in the playback apparatus and the font stored in the optical disc 1 is recommended. If this flag is set, the font stored in the optical disc 1 is used. This indicates that the content creator of the optical disc 1 recommends. The font number 322 indicates the number of font information and font data described later. The display priority 323 indicates the display priority order of a plurality of fonts stored on the optical disc. The font type 324 indicates the type of a plurality of fonts stored on the optical disc, and indicates whether it is a bitmap font or an outline font. The copy permission attribute 325 is a flag indicating whether or not a plurality of fonts stored on the optical disk may be copied to the flash memory 11 of the playback apparatus. The flags are set for the number of fonts (n) described in the font number 322. included. If this flag is set, it indicates that the corresponding font data can be copied to the flash memory 11. The usage limit 326 is information indicating the usage limit of the font copied to the flash memory 11 of the playback device, and includes information for the number of fonts (n) described in the font number 322. This information includes (1) no use restriction, (2) only the optical disc 1 of the designated content creator can be used, (3) only the optical disc 1 of the designated title group can be used, and (4) the optical disc 1 of the designated disc ID. Indicates only available. The restriction content 327 stores information associated with the use restriction 326, and when the use restriction 326 indicates that only the content creator specified by (2) can be used, it indicates the optical disk 1 of the content creator, and the use restriction 326 (3) indicates that only the optical disc of the designated title group can be used, indicates the title group to be designated, and (4) if the usage restriction 326 indicates that only the optical disc 1 of the designated disc ID is usable, the disc ID is indicated. Show.

  The details of the font information 312 will be described. Numeral 331 is an enumeration of font information, and font information is stored in order by the number (n) recorded in the font number 322. In FIG. 1, font information # 1 to font information #n are displayed.

  The details of the font data 313 will be described. 341 is an enumeration of font data, and font data is stored in order by the number (n) recorded in the font number 322. In FIG. 1, font data # 1 to font data #n are displayed. The details of the font information 331 will be described. 351 is a font name, and 352 is a storage address of font data. Among the above, the display character information 311 corresponds to the font data attribute.

  Note that the font data attribute associated with the font data is simultaneously stored in the flash memory 11 when the font data is copied to the flash memory 11. The disc ID is a unique number assigned to each optical disc.

  Thus, since the user can select the font data to be used for on-screen display, on-screen display in a font desired by the user, for example, subtitle display of a movie can be performed. In addition, the playback device may be provided with a memory having a capacity for storing one type of font data, and the cost is not increased. In addition, it is possible to use an outline font that can display a high-quality image regardless of the display resolution.

  In the above embodiment, the case where the font data for rewriting is supplied on the optical disc 1 has been described. However, the present invention is not limited to this, and for example, the font data for rewriting is supplied via communication means. It may be a thing.

  In FIG. 2, for example, when a rewrite instruction is input by the input device 15 in a state where the communication circuit 16 is connected to a communication line (whether wireless or wired), the control circuit 14 controls the communication circuit 16. To a predetermined server computer or a predetermined home page on the Internet. Then, the user selects a font to be downloaded, and downloads font data for rewriting from this server. Data downloaded and taken in via the communication circuit 16 is temporarily stored in the SDRAM 12 under the control of the control circuit 15. At this time, the downloaded data may be compressed. In this case, the data is decompressed (decompressed) when the download is completed, and is also restored to the original state (decompressed state) in the SDRAM 12. Store it. Thus, after the font data for rewriting is stored in the SDRAM 12, the flash memory 11 is rewritten by the same processing as described above.

  Further, like the attribute indicating the type of font data, the content supply side (such as a movie company) on the optical disk can set the font attribute by giving a permission attribute indicating whether or not the font data can be copied to the flash memory 11 of the playback device. It is possible to manage the data usage range, and to prevent the font data from being used in an unlimited manner.

  Furthermore, the content supply side (such as a movie company) on the optical disc manages the usage range of the font data in more detail by providing a use restriction attribute that can specify a condition for using the font data copied to the flash memory 11. Font data can be supplied according to user needs.

  Processing for determining font data to be loaded into the flash memory 11 based on the font data attributes (copy permission attribute, use restriction attribute) and user selection will be described with reference to the flowchart of FIG.

  In the case where three types of font data for rewriting are recorded and supplied on the optical disc 1, first, when the optical disc 1 on which the data for rewriting is recorded is loaded in the apparatus, the control circuit 14 records the data on the optical disc. The read data is read and reproduced, and the font data attribute attached to the font data is analyzed (S301). Of the font data attributes, when the display flag 321 indicates that the font of the playback device is to be used (S303), the font of the optical disc 1 is not used. When the display flag 321 indicates that the font of the optical disk is used (S303), the copy permission attribute 325 is checked next (S304). When the copy permission attribute 325 indicates that copying is not possible, the font of the optical disc 1 is not used. If the copy permission attribute indicates that copying is possible, it is added to the rewriting font list (S305). The other fonts are checked in the same manner (S306). When all the fonts are checked, the user is notified of the rewriting font list using on-screen display or the like, and the user selects font data to be loaded (S307). The font data to be taken into the flash memory 11 is determined by the user's selection (S308).

  FIG. 4 shows an example of a rewrite font list displayed on the screen on the screen.

  In FIG. 4, reference numeral 500 denotes a display screen, 501 denotes a font name display field, and 502 denotes a font attribute display field.

  3 types of fonts (font A, font B, font C) are displayed with type and usage restrictions. Fonts with “◎” mark on the type are outline fonts, and “○” mark is shown. The attached font indicates a bitmap font. Further, when “usual disc only” is displayed in the usage restriction (in the case of font A), it indicates that font A can be used only when the optical disc storing the font is reproduced. When “only XYZ movie company” is displayed in the usage restriction (in the case of font B), it indicates that font B can be used only when an optical disk created by XYZ movie company is played. When “None” is displayed in the usage restriction (in the case of font C), it indicates that font C can be used on all optical disks.

  In the above embodiment, four types (1) to (4) are shown as usage restriction attributes. However, the present invention is not limited to this. For example, the usage restriction attribute is not usable for menus but restricted to subtitles. The attribute may be used without any use, or using a determination by a program described in the restriction content.

Figure of font data attribute in one embodiment of the present invention 1 is a configuration diagram of an optical disk reproducing apparatus according to an embodiment of the present invention. The figure which shows the flowchart for demonstrating the process which capture | acquisition font data in one Example of this invention is decided. The figure which shows the font list for rewriting displayed on a display in one Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Reading part 6 DSP servo circuit 7 Demultiplexer 8 Video decoding part 9 Sub image decoding part 10 Audio | voice decoding part 11 Flash memory 12 SDRAM
13 Mixer 14 Control circuit 15 Input device 16 Communication circuit

Claims (10)

  A rewritable non-volatile font memory for holding font data used for on-screen display and font data stored in the font memory in an optical disk playback apparatus that reads and plays video data from an optical disk on which video data is recorded An on-screen display means for performing on-screen display using the input means, an input means for fetching font data to be written in the font memory, a temporary storage means for temporarily storing font data fetched by the input means, and a temporary storage means An optical disk reproducing apparatus comprising: control means for writing font data stored in the memory into a font memory; and font switching means for determining font data management information associated with the font data and switching a display method.   2. The optical disk reproducing apparatus according to claim 1, wherein a program for writing the font data stored in the temporary storage means into the font memory is fetched together with the font data by the input means.   3. The optical disk reproducing apparatus according to claim 1, wherein the input means is reading means for reading information from the optical disk.   3. The optical disk reproducing apparatus according to claim 1, wherein the input means is a communication means to which a communication line is connected.   3. The optical disk reproducing apparatus according to claim 1, wherein the font switching means is a bitmap font / outline font switching means.   An optical disc that is played back by the optical disc playback apparatus according to claim 1 or 2, and has a plurality of different types of font data for on-screen display.   7. The optical disc according to claim 6, wherein the plurality of different types of font data are bitmap font and outline font.   An optical disc that is played back by the optical disc playback apparatus according to claim 1, and has management information indicating a type of font data stored in the optical disc.   A rewritable non-volatile font memory for holding font data used for on-screen display and font data stored in the font memory in an optical disk playback apparatus that reads and plays video data from an optical disk on which video data is recorded An on-screen display means for performing on-screen display using the input means, an input means for fetching font data to be written in the font memory, a temporary storage means for temporarily storing font data fetched by the input means, and a temporary storage means Control means for writing the font data stored in the font memory, and copy determination means for determining whether to store the font data in the font memory by determining font data management information associated with the font data. Optical disc featuring Raw devices. An optical disc played back by the optical disc playback apparatus according to claim 9, wherein the optical disc has information as a condition for storing font data in a font memory.

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