JP4061670B2 - Video playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention is a video playback device for playing back video, wherein the background video is displayed in a karaoke device for performing karaoke by displaying a lyrics telop indicating lyrics and a background video displayed on the background of the lyrics telop on a monitor TV. The present invention relates to a device suitable for reproduction.
[0002]
[Prior art]
  Conventionally, a CD-ROM player has been used as a video playback device used in the karaoke apparatus.
  This CD-ROM player includes a plurality of (for example, four) CD-ROMs storing a plurality of background videos, and the playback time of one background video varies depending on the background video. 30 seconds. Each background video is stored in association with a genre of music such as enka and pop.
[0003]
  In the karaoke apparatus having the above configuration, the moving image player randomly selects one background video from a plurality of background videos corresponding to the genre indicated by the genre data included in the song data, and reproduces it. The background video reproduced by the video player is displayed on the monitor television, and the video player repeatedly executes selection and playback of the background video until the performance of the music is completed.
  For example, assuming that the playback time of a song to be played is 4 minutes and the playback time of one background video is 30 seconds, the above selection and playback are repeated 8 times in the same genre, and a total of 8 background videos are sequentially monitored. Displayed on TV.
[0004]
  However, since the conventional video player has a small number of background videos that can be played back, the same background video is played more frequently while singing songs of the same genre repeatedly, and the person who karaokes gets bored. there were.
  In view of this, it has been considered to reduce the frequency with which the same background video is reproduced by storing a larger amount of background video using a large-capacity storage medium such as a DVD (Digital Video Disk).
[0005]
[Problems to be solved by the invention]
  As a conventional CD-ROM player, one that caches a directory indicating the file name and address of each background video stored in the main memory at startup is known in order to shorten the seek time.
  When playing back a background video, this searches for the address associated with the file name of the background video from the directory cached in the main memory, and moves the read head to this searched address. The background video data stored at the address is read from the CD-ROM and reproduced.
[0006]
  However, a DVD has a background image that is about 10 to 20 times as large as that of a CD-ROM.
  Therefore, in order to cache all the directories set for each background video on the main memory, there is a problem that a main memory having a very large storage capacity must be provided.
  That is, in the video reproducing apparatus represented by the CD-ROM, search information (directory) used for searching for video information (background video) stored in the video information storage means (CD-ROM) is stored. There is a problem that a search information storage means (main memory) having a large storage capacity must be provided.
[0007]
  SUMMARY OF THE INVENTION An object of the present invention is to realize a video reproducing apparatus capable of reducing the storage capacity of search information storage means for storing search information used for searching video information stored in video information storage means.
[0008]
[Means for Solving the Problems]
  In order to achieve the above object, according to the first aspect of the present invention, in the first aspect of the present invention, video information indicating video is stored in association with search information used when searching for the video information. In a video playback apparatus that reads and plays back predetermined video information based on the search information from the storage means,The search information includes name information indicating an ASCII code name of video information associated with the search information,Of the search information stored in the video information storage means,The name information is composed of numerals and symbols used in hexadecimal notation.Read search information and read itName information composed of numerals and codes used in hexadecimal for the name information of search informationThe conversion means for converting to, and converted by this conversion meansHas name informationSearch information storage means for storing search information, and when the predetermined video information is read from the video information stored in the video information storage means, the search information associated with the predetermined video information is the search information. If the search information is stored in the search information storage means, the predetermined video information is stored in the video information storage means based on the stored search information. A technical means is provided that is provided with a reproducing means for retrieving and reading out the video information and reproducing the read video information.
[0009]
[0010]
  Claim2In the invention described in claim1In the video reproduction device according to the above, the search information includes the name information and type information indicating the type of video information associated with the search information having the name information. The means adopts a technical means that reads out the search information not having the type information among the search information stored in the video information storage means.
[0011]
  Claim3In the invention described in claim 1,OrClaim2In the video reproduction apparatus described in the above, when the reproduction unit reads predetermined video information from the video information stored in the video information storage unit, the search information associated with the predetermined video information is If the search information is stored in the search information storage means, and the search information is stored in the search information storage means, video information associated with the search information based on the stored search information Is read out from the video information storage means, and the read video information is reproduced. When the search information is not stored in the search information storage means, the search information is stored in the video information storage means. If the search information is stored in the video information storage means, the search information is associated with the search information based on the stored search information. With reading from the video information storage means image information, employing the technical means that is intended to reproduce the read-out video information.
[0012]
  Claim4In the invention described in claim 1, claims 1 to3In the video reproduction device according to any one of the above, the video information storage means employs technical means that stores the video information based on the MPEG standard.
[0013]
  Claim5In the invention described in claim 1, claims 1 to4A musical sound reproduction device comprising: the video reproduction device according to any one of the above and music information reproduction means for reproducing predetermined music information when the video information is reproduced by the video reproduction device. Is adopted.
[0014]
[Action]
  Claims 1 to5In the invention described inThe search information used when searching for video information has name information indicating the name of the video information associated with the search information using an ASCII code.The conversion means isOf the search information stored in the video information storage means, the search information consisting of numbers and codes used in hexadecimal display for name information is read out, and the name information of the read search information is used in hexadecimal. Name information consisting of numbers and symbolsConverted to that convertedHas name informationThe search information is stored in the search information storage means.
[0015]
  That is, the conversion means does not read all the search information from the video information storage means,Name information is composed of numbers and symbols used in hexadecimal notationTo retrieve only the search information,InspectionThe amount of search information is smaller than when all search information is read out. Moreover, the readingInspectionSearch informationName information consisting of numerals and codes used in hexadecimal for the name informationTherefore, the amount of information can be made smaller than the amount of information read from the video information storage means.
  In this way, all the search information is read from the video information storage means, and the read search information is stored in the search information storage means rather than stored in the search information storage means without any conversion. Since the amount of search information can be reduced, the storage capacity of the search information storage means can be reduced.
[0016]
  For example, as described in the embodiments of the invention described later,When the file name of the background video data is stored in the disk with ASCII code, it is composed of only “0” to “9” and “A” to “F” among the stored file names. By reading the file name and converting the read file name into a hexadecimal number, the data amount of the file name can be reduced from 4 bytes to 2 bytes by half.
Therefore, it is necessary to cache the directory as the search information on the main memory as the search information storage means.The storage capacity can be reduced.
[0017]
  When the reproduction means reads predetermined video information from the video information stored in the video information storage means, search information associated with the predetermined video information is stored in the search information storage means. If the search information is stored in the search information storage means, the predetermined video information is searched from the video information storage means and read based on the stored search information. The read video information is reproduced.
[0018]
  For example, as described in the embodiment of the invention described later, a search is performed to determine whether the file name of the background video instructed to be played is registered in the cache table of the main memory. The address associated with the file name being read is read from the cache table, and the background video instructed to be played back is read from the disk based on the read address and played back.
[0019]
  In particular, the claims3In the invention described in the above, the predetermined video information can be searched and reproduced in any case where the search information is stored in the search information storage means and in the case where the search information is stored in the video information storage means. it can.
  In other words, for example, when the file name of the background video instructed to be played is registered in the cache table of the main memory as described in the embodiment of the invention described later, it corresponds to the registered file name. The attached address is read from the cache table, and the background video instructed to be reproduced is read from the disk and reproduced based on the read address.
  Therefore, since only the read head of the background video data recorded on the disk is directly moved to the read address, the seek time is only the time for the read head to move from the current position to the address.
[0020]
  If the file name is not registered in the cache table of the main memory, the address associated with the file name is read from the directory entry table of the disk, and the reproduction is instructed based on the read address. Read the background video from the disc and play it.
  Therefore, in order to move the read head to the area where the directory entry table is stored and further to the read address, the seek time is the time when the read head moves from the current position to the directory entry table. This is the total time for moving from the directory to the address.
  That is, when the file name is registered in the cache table of the main memory, the seek time can be shortened compared with the case where the file name is registered in the directory entry table of the disk.
[0021]
[0022]
[0023]
  Claims2In the invention described in the above, when the search information includes the name information and the type information indicating the type of video information associated with the search information having the name information, the conversion means Reads out the search information stored in the video information storage means without the type information.
  Therefore, the claims1Since the amount of search information can be reduced as compared with the case where the technical means described in the above is adopted, the storage capacity of the search information storage means can be further reduced.
[0024]
  For example, as described in an embodiment of the invention described later, when a 4-byte file name of background video data is appended with an extension that is 1-byte type information and stored on a disk, the extension is included. By selecting and reading a file name having no extension, the data amount can be reduced as compared with the case of reading a file name having an extension.
  Therefore, it is possible to further reduce the storage capacity required for caching the directory as the search information in the main memory as the search information storage means.
[0025]
  Furthermore, the above claims 1 to3The technical means described in claim4As described above, the video information storage means is preferably used in a video playback apparatus that stores video information based on the MPEG standard.
  That is, the video information storage means for storing the video information based on the MPEG standard can store more video information than the video information storage means for storing the video information without being based on the MPEG standard. This is because the search information storage means for storing the search information used for the search requires a large storage capacity, but the storage capacity of the search information storage means can be reduced by employing the above technical means.
[0026]
  In particular, claims 1 to4The video playback device according to any one of claims 1 to 5,5As described above, the present invention is suitably used for a musical sound reproducing apparatus provided with music information reproducing means for reproducing predetermined music information when the video information is reproduced by the video reproducing apparatus.
  That is, for example, as described in the embodiment of the invention described later, the number of background images stored on a disc played back by a DVD player used in a karaoke apparatus as a musical tone playback apparatus is, for example, 32,000. In many cases, a large storage capacity is required for the main memory in order to cache a directory indicating a file name and an address as search information used for searching each background video. This is because the storage capacity of the main memory can be reduced.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, an embodiment of a video reproduction apparatus of the present invention will be described with reference to the drawings.
  In the following embodiments, the video playback device is used for a so-called communication karaoke device that is connected to a server that holds song data via a communication line, and receives and plays the song data from the server via the communication line. The background video playback device will be described as a representative. As a background video playback apparatus, a DVD player that plays a DVD will be described as a representative.
[0028]
  First, the main configuration of the karaoke apparatus provided with the DVD player of this embodiment will be described with reference to FIG.
  As shown in FIG. 1, a karaoke apparatus 10 includes a monitor television (hereinafter abbreviated as a monitor) 12 for displaying lyrics telop indicating lyrics, background video displayed on the background of the lyrics telop, video indicating music selection number, and the like. And a monitor 14 for the singer. Further, the karaoke apparatus 10 is provided with a DVD player 6 for reproducing a DVD (hereinafter referred to as a disc) on which background video data as video information of the present invention is stored.
[0029]
  Furthermore, the karaoke apparatus 10 includes a song selection for a karaoke song (hereinafter abbreviated as a song) as a song, lyrics telop of the selected song, performance data indicating a performance part of the song, and the like. A device (hereinafter referred to as a commander) 20 for receiving music data as music information via the communication cable 15, reserving music playback, and switching and synthesizing images displayed on the monitors 12 and 14. , Microphones 17 and 18 are provided.
[0030]
  Also, the karaoke apparatus 10 has mixing of sound and music input from the microphones 17 and 18, volume balance of sound and music, echo adjustment, delay adjustment, amplification of mixing signal, pitch control of the music to be played ( Key control), an amplifier 16 for controlling high and low sounds (tone control), a pair of speakers 13 and 13 for reproducing amplified signals output from the amplifier 16 as sound, and transmission for remotely operating the commander 20 A container 70 is provided.
[0031]
  Next, the configuration and function of the commander 20 will be described with reference to FIG.
  FIG. 2A is an explanatory diagram of the front panel of the commander 20, and FIG. 2B is an explanatory diagram of the rear panel of the commander 20.
  As shown in FIG. 2A, on the front panel of the commander 20, a numeric keypad 21 consisting of buttons 0 to 9 for inputting the music selection number of the music to be selected and a music selection button for confirming the music selection are displayed. 22, and a music selection number display 23 for displaying the music selection number of the selected music in LED with a 6-digit number is provided above the numeric keypad 21.
[0032]
  Also, on the left side of the music selection number display body 23, there is provided a reserved music number display body 24 for displaying the number of music reserved for performance by LED, and below that is for canceling the reservation. There are provided a cancel button 25, a performance stop button 26 for stopping performance, a re-singing button 27 for re-singing from the beginning while singing, and an interrupt button 28 for interrupting and reserving between reserved music. ing. Furthermore, a receiving unit 38 that receives an optical signal transmitted from the transmitter 70 is provided at the upper left of the front panel, and a power button 39 for turning on the power of the commander 20 is provided at the lower left.
[0033]
  On the right side of the numeric keypad 21, there are provided a flat key 29 for lowering the performance key, a standard key 30 for standardizing the key, and a sharp key 31 for increasing the key. Are provided with a vocal button 32 for setting the volume of the melody line of the vocal, a 2 chorus cut button 33 for reproducing up to the second chorus, and a post performance cut button 34 for cutting the posterior portion of the song. Furthermore, below these buttons, a karaoke switching button 35 for switching between a mode for performing karaoke and a mode for not performing karaoke, and data input via the communication cable 15 from music data to BGM, cable broadcasting, television broadcasting, etc. An input switching button 36 for switching to display and a service button 37 for switching the display of the monitors 12 and 14 to display of service information provided by a server or the like are provided.
[0034]
  As shown in FIG. 2B, the rear panel of the commander 20 is provided with a communication terminal 40 for connecting a communication cable 15 for communicating with the server 2 (see FIG. 3) installed in each region. On the right side of the communication terminal 40, a connector 69 for connecting a plug 68 connected to the control circuit 63 (see FIG. 4) of the DVD player 6 is provided. A video input terminal 58 for connecting a video output terminal 67 (see FIG. 4) of the DVD player 6 is provided on the right side of the connector 69. On the right side of the video input terminal 58, there are a video output terminal 42 connected to a video input terminal (not shown) of the monitor 12, and a video output terminal 43 connected to a video input terminal (not shown) of the monitor 14. An audio output terminal 41 for connecting to the audio input terminal of the amplifier 16 is provided on the right side of the video output terminal 43.
[0035]
  Next, the main configuration of the control system of the commander 20 will be described with reference to FIGS.
  FIG. 3 is an explanatory diagram showing the main configuration of the control system of the commander 20 as a block, FIG. 4 (A) is an explanatory diagram showing the main configuration of song data in blocks, and FIG. It is explanatory drawing which shows the main structures of the command contained in the music data shown to 4 (A) with a block.
[0036]
  As shown in FIG. 4A, the song data 130 includes a playback method instruction command 160 for instructing a playback schedule such as the type of background video to be played back and the playback order, lyrics telop data 132 indicating lyrics telop (caption), Are composed of performance data 133 indicating the performance portion of the music. The performance data 133 is composed of MIDI (Musical Instrument Digital Interface) data.
  Further, the reproduction method instruction command 160 indicates a reproduction instruction method of “PROG: 7899.1: A459.E:... BASE.P [CR]” as shown in FIG. Here, “7899.1”, “A459.E”, and “BASE.P” indicate the file names of the background video instructing playback.
[0037]
  As shown in FIG. 3, the commander 20 selects a song, requests to send the song data 130 to the server 2, receives the song data 130, sends various commands to the DVD player 6, reserves the performance order of the songs, audio control, and video. A CPU 45 that performs control and the like according to a program is provided. Further, the CPU 45 stores a ROM 46 storing a program executed by the CPU 45, received music data 130, data transmitted from the transmitter 70, music selection number data indicating the music selection number of the selected music, and reservation. A RAM 47 for temporarily storing the music selection number data of the selected music is connected.
[0038]
  Further, the CPU 45 stores a font ROM 44 in which font data for displaying on the monitors 12 and 14 characters indicating the words constituting the lyrics telop, the music selection number, the operating state of the karaoke apparatus 10, and the like. A video RAM 48 that temporarily stores data read and expanded into bitmap data is connected to a communication modem 49 for receiving music data 130 from the server 2 via the communication cable 15 and the communication terminal 40. . Further, the CPU 45 receives a sequencer 51 that controls writing MIDI data constituting the performance data 133 included in the music data 130 into the MIDI sound source 52 according to the count of the timer 53, and a sound source signal output from the MIDI sound source 52. An audio control circuit 50 that converts the signal into a signal that can be amplified by the amplifier 16 is connected.
[0039]
  Further, an interface 59 for inputting / outputting commands and the like to / from the DVD player 6 is connected to the CPU 45. Further, the CPU 45 converts the background video signal input from the DVD player 6 through the interface 59 into a display signal for display on the monitors 12 and 14, and converts the bitmap data output from the video RAM 48 to the lyrics telop. A video control circuit 54 for converting the video data to the video signal is connected. The video control circuit 54 performs control so that the lyrics telop 302 is superimposed on the background video 300 as shown in FIG. 31 for explaining the display screen of the monitor 12. The video control circuit 54 also performs control to change the color of the lyrics telop as the music progresses.
[0040]
  The CPU 45 also has a conversion circuit 55 that converts the optical signal received by the receiving unit 38 into a digital signal, an LED that lights when various buttons provided on the front panel of the control device 20 are pressed, and a song selection number display. A display circuit 56 for outputting a display signal to the body 23 and the reserved music number display body 24 and an input circuit 57 for inputting a switching signal generated when the various buttons are pressed are connected.
[0041]
  Next, the configuration of the transmitter 70 will be described with reference to FIG.
  As shown in FIG. 5, a music selection number display unit 71 for displaying a music selection number with a liquid crystal with a backlight is provided above the upper surface of the transmitter 70, and below that is a karaoke switching button 35 of the commander 20. Is provided with a karaoke switching button 72 having the same action as the above, an external video button 73 having the same action as the input switching button 36 of the commander 20, and a game button 74 for switching to a state in which the server 2 prepares a video game. ing.
[0042]
  Below these buttons are a clap button 75 for setting to play applause or cheering sound between songs or after the song has finished playing, and a flat key that has the same function as the keys provided on the commander 20. 76 and a sharp key 77 are provided below, a numeric keypad 78, a music selection button 79, a performance stop button 80, and a re-singing button 81 that operate in the same manner as those provided on the commander 20. A cancel button 82 and an interrupt button 83 are provided. Further, on the right side of the interrupt button 83, a minus button 84 for decreasing the volume of the vocal melody and a plus button 85 for increasing the volume are provided.
  When each button or key is pressed, an optical signal indicating the type of the pressed button or key is transmitted from a transmission window 86 formed at the tip of the transmitter 70.
[0043]
  Next, the main configuration and main functions of the DVD player 6 will be described with reference to FIGS.
  FIG. 6 is an explanatory diagram showing the main configuration of the control system of the DVD player 6 in blocks. FIG. 7A is an explanatory diagram showing a state in which a reading head that reads data stored on the disk scans the disk, and FIG. 7B is an explanatory diagram for explaining a seek time. . FIG. 8A is an explanatory diagram showing a configuration of a directory entry table for managing a directory of background video data stored on the disk. FIG. 8C is a diagram showing a main directory cache for caching a directory on the disk. It is explanatory drawing which shows the structure of the cache table memorize | stored on memory.
[0044]
  As shown in FIG. 6, the DVD player 6 includes a disk drive 61 that drives a disk 61A and a disk drive 62 that drives a disk 62A. Further, the disk drive 61 and the disk drive 62 include a disk rotation motor (not shown), a motor drive circuit, and a read head that reads data stored on the disk by irradiating the disk surface with light rays (indicated by 69 in FIG. 7). Etc. are provided respectively. As shown in FIG. 7A, the read head 69 scans the disk 61A that rotates in the direction indicated by the arrow F3 in the directions indicated by the arrows F1 and F2.
[0045]
  Further, the DVD player 6 is supplied with a buffer memory 65 for temporarily storing background video data (MPEG digital data) read from the disk 61A or the disk 62A, and background video data output from the buffer memory 65. An MPEG decoder circuit 66 for converting into an analog background video signal is incorporated.
  Further, the DVD player 6 includes a control circuit 63 having a CPU 64 for performing control for reading background video data from the disc 61A or the disc 62A, and a directory entry table (stored in the disc 61A and the disc 62A). A main memory 60 for caching FIG. 8) is incorporated.
[0046]
  On the disc 61A and the disc 62A, a large number (for example, 32,000) of background images are compressed in the MPEG2 video format and stored in a file format. Each background video is stored for each genre of music such as enka and pop, and the playback time varies depending on the background video such as 15 seconds and 30 seconds. Further, a directory entry table 90 shown in FIG. 8A is stored in each of the disk 61A and the disk 62A.
  The disc 61A and the disc 62A correspond to the video information storage means of the present invention.
[0047]
  As shown in FIG. 8A, in the directory entry table 90, order data 91 indicating the order of registration, file name data 92 indicating the file name of the background video data to be registered, and the disk storing the file are stored. Address data 93 indicating the position of the file, size data 94 indicating the data amount of the file, creation date data 95 indicating the date of creation of the file, and attribute data 96 indicating the attribute of the file are registered in association with each other. . The file name data 92 is composed of an ASCII code, and consists of a 4-byte file name and a 1-byte identifier. For example, in the file name data “A459.E”, the file name is “A459” and the identifier is “E”.
  In the present embodiment, a rewritable storage medium such as a RAM is used for the main memory 60.
[0048]
  Next, a series of operations of the karaoke apparatus 10 will be described with reference to FIG.
  FIG. 9 is a flowchart showing the processing contents of the CPU 45 from music selection to music performance.
  First, when the user of the karaoke apparatus 10 presses the power button 39 of the commander 20 to turn on the power of the commander 20, the power of the DVD player 6 and the amplifier 16 is turned on in conjunction therewith.
[0049]
  When the numeric keypad 78 corresponding to the music selection number of the song to be sung is pressed with the transmission window 86 of the transmitter 70 directed to the commander 20, the number corresponding to the numeric keypad 78 is displayed each time the keypad 78 is pressed. 12 and 13 are sequentially displayed.
  Subsequently, when the music selection button 79 is pressed after pressing the numeric keypad 78 of the last number, it is determined that the music selection is completed (step 100), and a request signal for requesting transmission of the music data 130 of the selected music is sent to the communication cable. 15 is transmitted to the server 2 via 15 (step 120).
[0050]
  Then, the server 2 retrieves and reads the music data 130 corresponding to the music selection number indicated in the request signal from the hard disk drive (HDD) 11 in which a plurality of music data is stored. The signal is received by the communication modem 49 via the communication cable 15 via the communication terminal 40 of the commander 20 (step 140). Subsequently, the received music data 130 is output from the communication modem 49 and temporarily stored in the RAM 47 (step 160). Subsequently, the music data 130 is read from the RAM 47 (step 180), and the playback method instruction command 160 included in the read music data 130 is transmitted to the DVD player 6 via the interface 59, and the background video is played back. Performed (step 200). In this step 200, the playback method instruction command 160 (FIG. 4B) is transmitted from the commander 20 to the DVD player 6, and the playback instruction data indicated by the playback method instruction command 160 is stored in the playback instruction table 140 of the main memory 60. Registered (FIG. 4C).
[0051]
  Here, control contents executed by the CPU 64 provided in the DVD player 6 will be described with reference to FIGS.
  FIG. 10 is a flowchart showing the contents of the disk access process executed by the CPU 64 to access the disk based on the playback method instruction command transmitted from the commander 20 in step 200. FIG. FIG. 19 is a flowchart showing the contents of directory cache processing executed by a CPU 64 to cache the directory entry table 90 stored in the disk 61A and the disk 62A in the main memory 60 in step 20. FIG.
[0052]
  First, when the CPU 64 performs an access for reading the background video data having the file name indicated by the reproduction instruction data registered first in the reproduction instruction table 140 from the disc, the access is performed by the DVD player 6. After the power is turned on, or after the disc 61A and the disc 62A are inserted into the DVD player 6, it is determined whether or not this is the first access (step 10). Subsequently, if it is the first access (step 10: Yes), the process proceeds to step 20, and the directory cache process shown in FIG. 11 is executed.
[0053]
  Here, the directory cache processing will be described with reference to FIG.
  First, the CPU 64 erases and empties various data registered in the cache table 100 set in the main memory 60, and sets the number of cache files indicating the number of cached files to “0” (step) 22). Subsequently, the directory entry pointer is set to the head file entry of the directory entry table 90 set in the disk 61A (step 24). Here, the directory entry pointer indicates a registered position of a file entry to be read from among the file entries registered in the directory entry table 90.
[0054]
  Subsequently, the CPU 64 determines whether or not the position indicated by the directory entry pointer exceeds the last file entry in the directory entry table 90 (step 26). Here, since the position indicated by the directory entry pointer is the head of the directory entry table 90, the process proceeds to step 28 (step 26: No), and the file entry indicated by the directory entry pointer is read (step 28). Here, the file entry whose file name data 92 at the head of the directory entry table 90 is “DATA.1”, address data is “00002”, and size data is “8” is read.
[0055]
  Subsequently, it is determined whether the file name of the read file entry can be indicated by only “0” to “9” and “A” to “F” (step 30).
  That is, it is determined whether the file name can be represented only by numbers and alphabets used in hexadecimal.
  Here, since the read file name is “DATA.1” and includes “T” other than “A” to “F”, the process proceeds to step 38 (step 30: No), and the directory entry pointer is set to 1. The second file entry is read after update (steps 26 and 28).
[0056]
  As shown in FIG. 8 (A), the second and third file names cannot be indicated by only numbers and alphabets that can be used in hexadecimal numbers. The entry is read (steps 38, 26, 28). The fourth file name is “A459.E”, and can be represented by only numbers and alphabets used in hexadecimal numbers. Therefore, the process proceeds to step 32 and converted to hexadecimal numbers.
  Each file name data 92 registered in the directory entry table 90 is actually registered by an ASCII code. For example, the file name “A459.E” is 6 bytes of “413435392E45” as shown in FIG. When this is converted into a hexadecimal number, as shown in FIG. 8 (D), it becomes 3 bytes of “A459.E” of only numbers and alphabets.
  As a result, the data amount of the file name data can be reduced from 6 bytes to ½ 3 bytes.
[0057]
  Subsequently, the CPU 64 registers the file name data “A459.E”, address data “00002”, and size data “8” converted into the hexadecimal number in the order indicated by the number of cache files in the main memory 60 ( Step 34). Here, since the number of cache files is “0”, it is registered at the head of the cache table 100 (step 34). As a result, as shown in FIG. 8C, “A459.E” is registered as the file name data 102 and “00002” is registered as the address data 103 in the file whose order data 101 is “1”.
[0058]
  Subsequently, “1” is added to the number of cache files (step 36), the directory entry pointer is updated by one (step 38), and the fifth and subsequent files in the directory entry table 90 are processed from step 26 to step 34. repeat. Of the fifth and subsequent files, the files indicated by only “0” to “9” and “A” to “F” have two file name data 92 of “1234.6” and “7899.1”. Therefore, these two files are registered in the second and third in the cache table 100 as shown in FIG.
  When the indicated position of the directory entry pointer exceeds the ninth file in the directory entry table 90, that is, the end, the directory cache processing is terminated (step 26: No).
[0059]
  In this way, only file entries whose file names consist only of “0” to “9” and “A” to “F” among the file entries registered in the directory entry table 90 are read out to the main memory 60. Since the file is cached, the storage capacity required for the cache of the main memory 60 can be made smaller than when all the file entries are cached.
  In addition, since the file name composed of the ASCII code is converted into hexadecimal and then cached, the amount of data to be cached can be reduced as compared with the case of caching without converting the file name, so the storage capacity required for the cache Can be further reduced.
[0060]
  Further, since the creation date data 95 and the attribute data 96 are not cached, the storage capacity required for the cache can be further reduced.
  Note that whether the creation date data 95 and the attribute data 96 are cached can be arbitrarily selected, and only one of the data can be cached.
[0061]
  Here, control contents for reproducing the background video by the CPU 64 of the DVD player 6 will be described with reference to FIG. 7B and FIG.
  FIG. 7B is an explanatory diagram for explaining the seek time until the reading head 69 reaches the reading position of the background video data from the access start position.
  Here, it is assumed that the background video data is read from the disc 61A.
  In step 200 described above, the reproduction instruction data indicated by the reproduction method instruction command 160 transmitted from the commander 20 is sequentially registered in the reproduction method instruction table 140 set in the main memory 60 as shown in FIG. Playback is scheduled in the order of registration.
[0062]
  Then, the CPU 64 determines whether the first registered file name data in the reproduction method instruction table 140 is composed of only “0” to “9” and “A” to “F” (step 50). . Subsequently, when the file name data is composed only of the numbers and alphabets (step 50: Yes), the file name data is registered in the cache table 100 of the main memory 60 to access the file name data. The corresponding address data 103 and size data 104 are read, and the read head 69 is accessed to the address indicated by the address data 103 (step 52).
  That is, as shown in FIG. 7B, the reading head 69 moves directly to the reading position 61B indicated by the address data 103. In this case, the seek time is T1.
[0063]
  On the other hand, when the file name data is not composed only of “0” to “9” and “A” to “F” (step 50: No), the directory entry table in which the file name data is stored in the disk 61A. The address data 93 and the size data 94 corresponding to the file name data are read, and the read head 69 is accessed to the address indicated by the address data 93 (step 54).
  That is, as shown in FIG. 7B, the read head 69 moves to the directory entry table 90 stored on the disk 61A in order to read the address data 93 and the size data 94 (T2). To the reading position 61B (T3). The seek time in this case is (T2 + T3).
[0064]
  Here, the first registered file name data in the reproduction instruction table 140 is “7899.1” and is composed of only numbers “0” to “9” (step 50: Yes). Then, the cache table 100 of the main memory 60 is accessed, and the address “01566” and the size “1000” associated with the file name “7899.1” are read, and the read head 69 reads the address indicated by the address “01566”. Move directly to position.
  That is, when the file name data is composed only of “0” to “9” and “A” to “F”, the address and size are read from the cache table 100 of the main memory 60, and the read head 69 Move directly to the address.
[0065]
  As described above, when the file name to be accessed is registered in the cache table 100 of the main memory 60, the read head 69 can be directly moved to the address corresponding to the file name. The seek time can be shortened compared to the case where the directory entry table 90 is registered.
  Moreover, the longer the seek time, the longer it takes to read the background video data to be reproduced next. Therefore, it is necessary to increase the storage capacity of the buffer memory, but the seek time can be shortened by the above configuration. Therefore, the storage capacity of the buffer memory can be reduced.
[0066]
  The background video data read by the reading head 69 is transferred to the buffer memory 65 (FIG. 6) and temporarily stored in the buffer memory 65. Subsequently, the background video data temporarily stored in the buffer memory 65 is output to the MPEG decoder circuit 66 and converted into a background video signal by the MPEG decoder circuit 66. The background video signal output from the MPEG decoder circuit 66 is input to the video control circuit 54 via the video output terminal 67 and the video input terminal 58 of the commander 20 (FIG. 3). The input video signal is converted into a video signal to be displayed on the monitors 12 and 14 by the video control circuit 54, and is output to the monitors 12 and 14 via the video output terminals 42 and 43, as shown in FIG. As described above, the background image 300 is displayed.
  The display of the first background image 300 is performed until the reading head 69 reaches the position indicated by the size “1000” from the address “01556”.
[0067]
  Next, reading of the background video data corresponding to the file name “A459.E” registered second in the reproduction instruction table 140 is executed, and the second file name is also “0” to “9”. And “A” to “F”, the address and size are read from the cache table 100 of the main memory 60, and the read head 69 moves directly to the address and reads the background video data (step). 50, 54).
  Thereafter, the third to eighth background images are sequentially displayed on the monitors 12 and 14 by executing the same steps as described above. In this case, since the eighth file name “BASE.P” includes alphabets “S” and “P” other than “A” to “F”, the read head 69 is moved to the directory entry table 90 of the disk 61A. The address and size are read out and moved to that address.
[0068]
  By the way, although the process of reproducing the background video has been described so far, actually, the song is played at the timing when the first background video is reproduced, and the lyrics telop is displayed on the monitors 12 and 14.
  Hereinafter, the reproduction of the lyrics telop data 132 and the performance data 133 (FIG. 6A) constituting the music data 130 will be described with reference to FIG.
  MIDI data constituting the performance data 133 included in the song data 130 read from the RAM 47 of the commander 20 is taken into the sequencer 51 and written into the MIDI sound source 52 according to the count of the timer 53. The sound source signal output from the MIDI sound source 52 is output to the audio control circuit 50 and converted into a music signal that can be amplified by the amplifier 16, and the converted music signal is output to the amplifier 16. Then, the outputted music signal is amplified to the volume set by the amplifier 16 and then outputted to the speakers 13 and 13 and reproduced as a performance sound by the speakers 13 and 13 (step 220).
[0069]
  Also, font data corresponding to the lyrics telop data 132 included in the song data 130 is read from the font ROM 44, and the read font data is expanded into bitmap data and stored in the video RAM 48. Subsequently, the bitmap data is output to the video control circuit 54 and converted into a display signal that can be displayed on the monitors 12 and 14 by the video control circuit 54. As shown in FIG. 14 displays a lyrics telop 302. (Step 240)
[0070]
  The audio signals input from the microphones 17 and 18 are mixed with the music signal in the amplifier 16, and the mixed signals are output from the audio output terminal 41 to the amplifier 16. Then, the output mixing signal is amplified to a volume set by the amplifier 16 and then output to the speakers 13 and 13, and is reproduced as a mixing sound by the speakers 13 and 13.
  That is, the user can sing (karaoke) the selected song through the microphone 17 or the microphone 18 while watching the background image 300 and the lyrics telop 302 displayed on the screens of the monitors 12 and 14.
[0071]
  When the reproduction is finished (step 260), the CPU 45 determines whether or not the music selection number data reserved in the RAM 47 is stored (step 280), and if it is stored (step 280: Yes), the storage is performed. The selected music selection number data is read from the RAM 47 (step 300), and the reserved music is reproduced by executing steps 100 to 280.
[0072]
  Next, a modification of the directory cache process shown in FIG. 11 in the first embodiment will be described with reference to the flowchart shown in FIG.
  12, step 29 corresponds to step 30 in FIG. 11, and steps other than step 29 are the same as the directory cache processing shown in FIG. 11, so steps other than step 28, step 29, step 32, and step 34 are performed. The illustration of these steps is omitted.
  In step 29, it is determined whether or not the file name of the file entry read in step 28 is composed only of “0” to “9” and “A” to “F”, and there is no extension. .
[0073]
  That is, it is determined whether or not the read file name is composed of numbers and symbols used in hexadecimal numbers and has no extension.
  Subsequently, if the read file name is composed of numbers and signs used in hexadecimal numbers and has no extension, the file name is converted to hexadecimal number (step 32), The converted file name, address and file size are registered in the cache table (step 34).
  For example, when the read file name is “1234”, it is composed only of “0” to “9” and has no extension, so it is registered in the cache table 100 (step 29: Yes). When the file name is “A459.E”, the extension “E” is attached, and thus it is not registered in the cache table 100 (step 29: No).
[0074]
  As described above, according to the directory cache processing, the file name can be indicated by the numbers and signs used in hexadecimal numbers, and only the file entry without the extension can be registered in the cache table 100. Regardless of whether or not a child is attached, the storage capacity required for the cache can be made smaller than when registering a file entry in the cache table 100 in which a file name can be indicated by a number and a sign used in hexadecimal. it can.
[0075]
  In each of the above embodiments, the DVD player provided in the karaoke apparatus is described as a representative example of the video reproducing apparatus of the present invention. However, the CD-ROM player provided in the karaoke apparatus or the DVD player used other than the karaoke apparatus is used. The present invention can also be applied to a CD-ROM player.
[0076]
  By the way, the directory cache processing (step 22 to step 38 in FIG. 11) executed by the CPU 64 functions as the converting means of the present invention, and the steps 50 to 54 in FIG. 10 function as the reproducing means.
[0077]
【The invention's effect】
  As described above, according to the present invention, it is possible to realize a video reproducing apparatus capable of reducing the storage capacity of the search information storage unit that stores the search information used for searching the video information stored in the video information storage unit. it can.
[Brief description of the drawings]
FIG. 1 is an explanatory view of the appearance of a karaoke apparatus according to an embodiment of the present invention.
FIG. 2A is an explanatory diagram of a front panel of a commander provided in the karaoke apparatus, and FIG. 2B is an explanatory diagram of a rear panel of the commander.
FIG. 3 is an explanatory diagram showing in block form the configuration of a commander control system;
4A is an explanatory diagram showing the main structure of song data in blocks, FIG. 4B is an explanatory diagram showing the structure of a playback method instruction command, and FIG. 4C shows the structure of a playback instruction table; It is explanatory drawing.
FIG. 5 is an explanatory diagram of a transmitter provided in the karaoke apparatus.
FIG. 6 is an explanatory diagram showing the configuration and functions of a DVD player in blocks.
FIG. 7A is an explanatory diagram showing a state in which a reading head that reads data stored on a disk scans the disk, and FIG. 7B is an explanatory diagram for explaining a seek time. .
8A is an explanatory diagram illustrating a configuration of a directory entry table, FIG. 8B is an explanatory diagram of file name data “A459.E” indicated by an ASCII code, and FIG. FIG. 4D is an explanatory diagram showing a configuration of a cache table, and FIG. 4D is an explanatory diagram of file name data “A459.E” converted into a hexadecimal number.
FIG. 9 is a flowchart showing control contents from music selection to reserved music reproduction executed by the CPU 45 of the embodiment of the present invention.
FIG. 10 is a flowchart showing the contents of a disk access process executed by the CPU 64 to access the disk based on the playback method instruction command transmitted from the commander 20 in step 200;
11 is a flowchart showing the contents of directory cache processing executed by a CPU 64 for caching the directory entry table 90 stored in the disk 61A and the disk 62A in the main memory 60 in step 20 of FIG.
12 is a flowchart showing another embodiment of the directory cache process shown in FIG.
FIG. 13 is an explanatory diagram for explaining a display screen of the monitor 12;
[Explanation of symbols]
    6 DVD player
  10 Karaoke equipment
  15 Communication cable
  16 amplifiers
  20 Commander
  45, 64 CPU
  60 main memory
  61A, 62A disc
  69 Read head
  90 Directory entry table
100 cash table
130 song data
140 Playback instruction table
160 Playback method command
  T1 seek time

Claims (5)

Video that reads and reproduces predetermined video information based on the search information from video information storage means in which video information indicating a video and search information used when searching for the video information are stored in association with each other In the playback device,
The search information includes name information indicating an ASCII code name of video information associated with the search information,
Of the search information stored in the video information storage means, the search information is composed of numbers and codes used in hexadecimal display for the name information, and the name information of the read search information is expressed in hexadecimal. Conversion means for converting into name information composed of numbers and symbols used in
Search information storage means for storing search information having name information converted by the conversion means;
When the predetermined video information is read from the video information stored in the video information storage means, the search information stored in the search information storage means is searched for search information associated with the predetermined video information, When the search information is stored in the search information storage means, the predetermined video information is searched and read from the video information storage means based on the stored search information, and the read video Playback means for playing back information;
A video playback apparatus comprising: The search information includes
Including the name information and the type information indicating the type of video information associated with the search information having the name information,
The converting means includes
Wherein among the stored retrieval information in the video information storage means, the video reproducing apparatus according to claim 1, wherein those reading the retrieval information having no type information. The reproducing means includes
When the predetermined video information is read from the video information stored in the video information storage means, the search information stored in the search information storage means is searched for search information associated with the predetermined video information, When the search information is stored in the search information storage means, the video information associated with the search information is read from the video information storage means based on the stored search information and the read If the search information is not stored in the search information storage means, it is searched whether the search information is stored in the video information storage means, and the search information is the video information. When stored in the storage means, the video information associated with the search information is read out from the video information storage means based on the stored search information. The video reproducing apparatus according to claim 1 or claim 2, characterized in that for reproducing the read-out video information. It said video information storage means, the video reproducing apparatus according to any one of claims 1 to 3, characterized in that said video information is for storing on the basis of the MPEG standard. A video reproducing apparatus according to any one of claims 1 to 4, wherein the video information and is provided music information reproduction means for reproducing the predetermined music information when it is reproduced by the video reproducing apparatus A musical sound reproducing apparatus characterized by the above.

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