JP2005223939A - Video reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video reproducing apparatus capable of reproducing compressed video data through the same route by means of one decoder when selectively reproducing compressed video data downloaded via a network and stored on a hard disk and compressed video data read from a disk reproducing device. <P>SOLUTION: A DVD changer 31 includes a function only for reading second compressed video data written on a DVD, and an MPEG decoder 19 is provided in a main body of a karaoke system. The second compressed video data are read at high speed and temporarily buffered on a hard disk 17. Furthermore, first compressed video data are stored also on the hard disk 17. When reproducing the first and second video data, the same MPEG decoder 19 is used for the both, and data are transmitted through the same route as inputting from the hard disk 17 to the MPEG decoder 19. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a karaoke apparatus that reproduces a moving image as a background image and a video reproducing apparatus that reproduces a moving image.

  Many of the currently popular karaoke apparatuses have a function of displaying a background video (BGV: background video) in parallel with the performance of a karaoke song. Video data of moving images used for BGV is compressed and stored on a DVD or CD-ROM using a compression method such as MPEG, and this data is read out in parallel with the performance of a karaoke song, expanded and displayed on a monitor. It is like that.

  In general, a DVD drive or a CD-ROM drive of a karaoke device is configured as a separate device from the karaoke device main body and includes an MPEG decoder (decompression circuit) inside. And according to the instruction | indication of the karaoke apparatus main body, it was comprised so that predetermined | prescribed video data might be read from DVD and CD-ROM, it expand | extends, and it outputs as a video signal.

  However, the display of BGV in the current karaoke performance has become complicated, such as displaying a plurality of BGVs while switching. In order to switch BGV seamlessly, it is necessary to synchronize the reading of the preceding and subsequent video data, but this is not possible with a single DVD (CD-ROM) drive because the movement of the track and the disk change are not in time. Met. A part of the music data is stored on the DVD or CD-ROM, but the music data of the next reserved music cannot be read from the DVD or CD-ROM while the drive is used for BGV playback. Therefore, there was a problem that it took time to start the next song.

  In addition, by using a high-speed distribution means such as satellite communication, it is possible to download video data of moving images from the distribution center. However, in a conventional karaoke apparatus, a decoder for expanding MPEG is a DVD drive or a CD-ROM drive. When the downloaded video data is stored in the hard disk of the karaoke device, the MPEG decoder is required separately from the built-in drive, and the equipment is redundant and wasted. there were.

  The present invention enables synchronized switching of BGV and pre-reading of music data with a single DVD drive or CD-ROM drive, and reproduction of video data stored on the hard disk by downloading from a distribution center. It is an object of the present invention to provide a video reproduction apparatus in which MPEG decoders do not overlap even when doing so.

  The present invention includes a hard disk for recording compressed video data of a moving image, video data receiving means for receiving the first compressed video data via a network, and writing the first compressed video data to the hard disk, and a second A disk playback device that reads the second compressed video data from the disk medium storing the compressed video data and writes the second compressed video data as a buffer to the hard disk; and the first compressed video data and the second compressed video data. A decoder that decompresses and reproduces the first compressed video data written to the hard disk via the network, and decompresses and reproduces the second compressed data written to the hard disk from the disk medium. It is characterized by that.

  In the present invention, the disc playback device reads (second) compressed video data and receives (first) compressed video data via a network. The disk reproducing device is, for example, a DVD, a CD-ROM, or a drive thereof, and an MPEG method or the like may be used as a compression method.

  The first compressed video data received via the network is stored in the hard disk. When reproducing the first compressed video data, the first compressed video data is input from the hard disk to the decoder. The second compressed video data read by the disc playback device is buffered on the hard disk and input from the hard disk to the decoder. The decoder decompresses and reproduces the first and second compressed video data.

  According to the present invention, the first compressed video data downloaded via the network and stored in the hard disk and the second compressed video data read by the disk playback device are used in common, so that the hardware configuration is achieved. Can be simplified. In addition, once the second compressed video data is buffered on the hard disk and then input to the decoder, the output path can be shared by the first and second compressed video data, and management, selection and switching are easy. Become.

  FIG. 1 is a block diagram of a karaoke apparatus according to an embodiment of the present invention. This karaoke apparatus has a karaoke performance unit 21 including a sound source and a PCM decoder for decoding sound data, and the karaoke performance unit 21 generates karaoke performance sounds based on the music data. In addition, lyrics and background video are displayed on the monitor 32 in synchronization with the karaoke performance. As music data for karaoke music performance, new music is stored in the hard disk 17, and classic music that has been used for a long time is stored in a disk set in the DVD changer 31. Video data for background video reproduction is MPEG-compressed and stored on a disk in the DVD changer 31. A plurality of DVDs can be set in the DVD changer 31, and the disk is exchanged in accordance with an instruction from the CPU 10, and data is read from a predetermined track. The music data and the video data may be stored on separate DVDs, or the music data and video data having similar genres may be stored on the same DVD to reduce the number of disk changes. The apparatus main body and the DVD changer 31 are connected by a high speed interface such as SCSI or IEEE1394.

  In FIG. 1, a CPU 10 for controlling the entire karaoke apparatus includes a ROM 11, a RAM 12, a hard disk 17, a communication control unit 16, a commander receiving unit 13, an operation unit 14, a display unit 15, a pattern development unit 18, an MPEG decoder 19, and display control. The unit 20 and the karaoke performance unit 21 are connected. The DVD changer 31 is also connected through the high speed interface.

  The ROM 11 stores a program for starting the karaoke device. The hard disk 17 stores the music data, video data, and the like, and also stores programs such as a system program, a karaoke performance program, a loader, and character pattern data as shown in FIG. The system program is a program for controlling the basic operation of the apparatus, and is read into the RAM 12 when the karaoke apparatus is activated. A karaoke performance program is a program for controlling the karaoke performance part 21 based on music data. The loader is a program for downloading music data and video data for background video from the distribution center. The character pattern data is data for expanding text information such as lyrics and song names given as code information into character patterns. In the RAM 12, two areas are set for reading the program, and for the music data buffer for reading the music data currently being played and the music data to be played next.

  The communication control unit 16 is a controller for communicating with a distribution center via a communication line and downloading music data, video data, and the like. The communication control unit 16 has a built-in DMA circuit, and can directly download downloaded music data and video data to the hard disk 17 without using the CPU 10.

  The commander receiving unit 13 receives the infrared signal sent from the commander 30 and restores the data. The commander 30 includes a plurality of key switches such as a numeric keypad for inputting a music number and a set key for setting a music number. When the user operates these key switches, the commander 30 transmits an infrared code signal corresponding to the operated key switch. The commander receiving unit 13 receives this infrared code signal, restores it to data, and inputs it to the CPU 10. The CPU 10 executes various processes such as karaoke song reservation and key change based on this data. The operation unit 14 is provided on the front panel of the karaoke apparatus main body, and includes a key switch similar to the commander 30 described above. The display unit 15 is also provided on the front panel of the karaoke apparatus main body in the same manner as the operation unit 14 and includes an LED matrix display for displaying the number of the song currently being played and the number of reserved songs.

  The karaoke performance unit 21 is a circuit unit that generates a karaoke performance sound based on music data, and includes a sound source, a PCM decoder, an effect DSP, etc., and the sound source generates a music sound based on a music track in the music data, The PCM decoder reproduces sound such as back chorus based on the sound data of the music data. The effect DSP gives an effect such as echo reverb to the generated musical sound and the reproduced sound. Further, a microphone 34 is connected to the karaoke performance unit, and the singing voice signal input from the microphone 34 and the karaoke performance sound are mixed and output from the speaker 33.

  On the other hand, the pattern development unit 18 has a VRAM and is a circuit unit that develops a character pattern based on the lyrics display data read from the lyrics track of the music data and converts it into a video signal. The MPEG decoder 19 decompresses MPEG-compressed video data input from a video data buffer 174 (to be described later) and plays it back as an NTSC video signal when a karaoke song is played.

  FIG. 2 is a diagram showing the configuration of the hard disk 17. As described above, the hard disk 17 stores a program 170 such as a system program and an application program, new song data 171, new video data 172, character pattern data 173 for displaying lyrics, and the like. The song data storage area 171 is an area for storing song data of new songs that are periodically downloaded from the distribution center. The music data of an old song is written on a DVD and set in the DVD changer 31. The video data storage area 172 is an area for storing video data of a new moving image downloaded from the distribution center. This video data is also MPEG compressed. The video data buffer 174 is an area for reading and buffering a predetermined amount of video data stored on the DVD at a high speed.

  FIG. 3 is a diagram showing a configuration of music data used in the karaoke apparatus. The music data consists of a header, a musical sound track, a lyrics track, an audio control track, an effect control track, and an audio data section. The header is a portion in which various data relating to the music data is written, and includes data such as a music number, a music title, a genre, a release date, and a performance time of the music. Each piece of music data is identified by a music number.

  The music track, lyrics track, voice control track, and effect control track are all described in the MIDI format. The MIDI format is originally a format for describing musical sound control data such as a musical sound track. However, in order to describe all data in a unified format and facilitate implementation, tracks other than the musical sound are also in the MIDI format. It is described. The MIDI format track is composed of a plurality of event data and timing data for instructing the read timing of each event data. When a karaoke song is played, the plurality of tracks are read out in parallel. In each track, the value of the timing data is counted by a predetermined tempo clock, and when this value is counted up, event data indicated by the timing data is read out. The read event data is output to a predetermined operation unit, and a corresponding process is executed in the operation unit.

  The musical sound track is composed of a multi-part track such as a melody track and a rhythm track. The event data of the musical tone track is note-on event data for instructing the pronunciation of the musical tone, note-off event data for instructing the muting of the musical tone, etc. These event data are output to the sound source of the karaoke performance unit 21.

  The event data of the lyrics track is composed of data indicating the character code, display coordinates, display color, etc. of the lyrics displayed on the monitor 32. When this data is read, the CPU 10 reads the corresponding character pattern data from the hard disk 17. The data is read out and developed on the pattern development unit 18.

  The event data of the audio control track is data indicating the audio data of the audio data section. When this event data is read, the audio data specified by the data is input to the PCM decoder of the karaoke performance section 21. The The voice data is data obtained by digitizing a human voice such as a back chorus that is difficult to synthesize with a sound source.

  The event data of the effect control track is data for controlling the operation of the effect DSP included in the karaoke performance section 21, and the kind of effect to be given to the karaoke performance sound or the singing voice signal input from the microphone 34. It consists of data indicating the degree. This data is input to the effect DSP.

  In the karaoke apparatus having the above configuration, when a user operates the commander 30 or the like to select a karaoke song, first, the song data of the song is read and written into the song data buffer of the RAM 12. The music data is read from the hard disk 17 or the DVD changer 31. Genre data is read from the header of the read music data, and a background video is selected based on this genre data. When the selected background video is stored on the DVD, a predetermined amount of video data is read in advance into the video data buffer 174 of the hard disk 17 and then karaoke performance is started. The video data is read out at a speed several times that of normal playback. When a certain amount of data is buffered in the video data buffer 174, karaoke performance is started. During the karaoke performance, the CPU 10 reads 1) the music data in accordance with the tempo clock, and inputs the event data to an operation unit such as the karaoke performance unit 21. 2) The video data buffered in the video data buffer is MPEG decoder 19. 3) The operation of reading the video data from the DVD changer 31 to the video data buffer 174 at high speed is executed in parallel using the idle time of the above operation. If there is sufficient free time, the music data of the karaoke song to be played next is read into the music data buffer of the RAM 12.

  FIG. 4 is a flowchart showing the operation of the karaoke apparatus. First, it is determined whether or not a karaoke song is selected by the user (s1). When the music is selected, the music data is read into the music data buffer of the RAM 12, and the performance of the karaoke music is prepared (s2). Based on the genre data written in the header of the music data, the background video (BGV ) Is selected (s3). It is determined whether the video data of the selected background video is stored on the DVD or downloaded from the distribution center and stored on the hard disk 17 (s4). If it is stored on the DVD, go to s5.

  In s 5, an instruction is sent to the DVD changer 31 to set the corresponding DVD, and video data is read in advance from this DVD and buffered in the video data buffer 174 of the hard disk 17. When data is buffered to such an extent that the CPU 10 can perform various processes in parallel, the karaoke performance is started according to the determination of s6. Karaoke performance is performed by reading music data according to the tempo clock and reading the read performance data (music track event data, audio control track data, effect control track event data, etc.). 21, an operation of executing a performance of a karaoke song (s7), an operation of reading a character pattern based on the lyrics data which is the event data of the lyrics track, and developing this to a predetermined address of the pattern development unit 18 (s8) ), And an operation (s9) of inputting the video data buffered in the video data buffer 174 to the MPEG decoder 19 to reproduce the background video (s9). The CPU 10 processes these in parallel and reads the video data following the video data buffer 174 from the DVD changer 31 in consideration of the amount of data buffered in the video data buffer 174 and the task load (s10). ). Here, when switching the background video, it is only necessary to seek the next video data and read the data into the video data buffer 174. If there is more room, it is determined whether a karaoke song to be played next is reserved (s11). If the karaoke song is reserved, the reserved song is stored in the hard disk 17, or Then, it is determined whether the DVD changer 31 is stored in the DVD currently set for reading the video data (s12). If stored in these disks, the music data is read into the music buffer of the RAM 12 in advance between tasks in order to start the next karaoke music performance (s13). The above operation is performed in parallel until the music is finished (s14), and when the music is finished, the above operation is finished.

  Note that if the music data of the reserved music is not stored in the hard disk 17 or the DVD set for reading the current video data, that is, stored in the DVD that is not currently set, the video When the data buffering is completed, the DVD is changed and the next music data is read out.

  On the other hand, when the video data of the background video is stored in the hard disk 17, it is not necessary to buffer the hard disk 17 again, so the karaoke performance is started immediately. In the karaoke performance, the music data is read in accordance with the tempo clock, and the read performance data is input to the karaoke performance section 21 to execute the performance of the karaoke music (s20), and the lyrics data is the event data of the lyrics track. Based on this, a character pattern is read out and developed to a predetermined address of the pattern development unit 18 (s21), and the video data buffered in the video data buffer 174 is input to the MPEG decoder 19 to reproduce the background video. Operation (s22) and the like. The CPU 10 processes them in parallel, and if there is room, the CPU 10 determines whether there is a reservation for the next karaoke song (s23). If there is a reservation, the reserved song is stored in the RAM 12 in advance. Reading into the music data buffer (s24). If the music data of the next song is stored in the hard disk 17, it is written, and if it is stored in the DVD, the DVD changer 31 is instructed to set this disc, and the music is read from this disc. Post the data. The above operation is performed in parallel until the music ends (s25), and when the music ends, the above operation ends.

  In the above embodiment, the storage medium for storing video data is DVD, but other storage media such as CD-ROM, PD, and MO may be used. Further, the number of changers is not limited to one, and a plurality of changers may be provided.

  In the above-described embodiment, the configuration is such that one MPEG decoder 19 is provided. However, by providing two MPEG decoders, the video can be switched in synchronization at a more free timing. Further, by providing this in combination with an effect device, an effect can be applied at the time of switching, and more effective video switching can be performed.

  Further, the video data stored in the hard disk 17 is not limited to the data downloaded from the distribution center, but may be stored as a cache which is stored in the DVD but frequently used.

The block diagram of the karaoke apparatus which is embodiment of this invention The figure which shows the structure of the hard disk of the karaoke device The figure which shows the structure of the music data used with the karaoke apparatus Flow chart showing operation of the karaoke apparatus

Explanation of symbols

17: Hard disk, 174: Video data buffer,
16 ... Communication control unit, 19 ... MPEG decoder,
31 ... DVD changer

Claims (1)

A hard disk for recording compressed video data of the video,
Video data receiving means for receiving first compressed video data via a network and writing the first compressed video data to the hard disk;
A disk playback device that reads the second compressed video data from a disk medium storing the second compressed video data and writes the second compressed video data as a buffer to the hard disk;
The first compressed video data provided in common with the first compressed video data and the second compressed video data, and the first compressed video data written in the hard disk via the network is decompressed and reproduced, and the hard disk from the disk medium is reproduced. A decoder that decompresses and reproduces the second compressed data written in
A video reproducing apparatus comprising:

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