JPH04324165A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To enable to reproduce by selecting plural kinds of videos for the reproduction of a piece of music. CONSTITUTION:When a disk 1 is reproduced, two kinds of video data are listed successively together with the audio data on the reproducing video memories 7, 8 at a real time. The video data of the side selected with a switch 9 is displayed on a monitor 12 with a display control part 10 and a NTSC conversion part 11. Switching of the displayed data is conducted by being switched a switch in accordance with the instruction of a control part 26.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing apparatus preferably used in a so-called karaoke apparatus.

0002

2. Description of the Related Art Conventional karaoke machines include those using magnetic tape and those using laser discs. Among these, devices that use laser discs are widely used as karaoke devices that provide a more realistic feeling because they can play back images at the same time.

[0003] Normally, signals as shown in FIG. 3 are frequency-multiplexed and recorded on a laser disk. Among the laser discs used in karaoke machines, audio FM
The monaural performance and the singer's singing voice are recorded on two signal channels. Furthermore, a high-quality digital stereo performance of the CD (compact disc) system is assigned to the CD multiplex signal. In such a karaoke device, it is possible to sing a song while viewing a video reproduced at the same time as a performance signal. Furthermore, by reproducing the audio FM signal, it is possible to sing while listening to the singer's voice. It is also possible to add a function that automatically turns off the singer's voice when the user starts singing.

0004

[Problems to be Solved by the Invention] However, in the above-mentioned karaoke apparatus, since only one type of video signal is recorded for each song on the disc, it is not possible to switch the playback video for the same song. do not have. In the case of the above-mentioned laser disc, the video signal is frequency-multiplexed and recorded together with other signals. Therefore, it is physically impossible to simultaneously record multiple types of video signals on the same track. On the other hand, if different types of videos are recorded on different tracks and the playback tracks are appropriately switched during playback, the above-mentioned karaoke apparatus can appropriately switch the playback videos. However, if this switching is performed using one pickup, when switching the playback track,
Time is required to search for the corresponding track. Therefore, video breaks occur in the reproduced video during this search. In order to eliminate such interruptions, it is necessary to prepare a plurality of pickups and have each pickup play back each video track at the same time. However, in such a case, manufacturing costs increase as the number of pickups increases.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a disc playback device that can smoothly switch video images using a single pickup.

[0006]

[Means for Solving the Problems] In view of the above problems, the present invention provides a disc playback device for playing back a disc on which audio data and a plurality of types of video data are digitally recorded with time axis compression. a reading means for reading the plurality of video data together with the audio data by the pickup in real time; an audio reproduction means for reproducing the read audio data; and a video data selection means for selecting one of the read video data. and a video reproducing means for reproducing the selected video data.

[0007]

[Operation] Since each video data is digitally recorded on the disk by time axis compression, each video data can be read simultaneously in real time even with a single pickup. Therefore, by appropriately controlling the selection of video data by the selection means, it is possible to switch the reproduced video without causing video interruption.

[0008]

Embodiment In this embodiment, a CD-ROM is used as a recording medium for a karaoke apparatus. A CD-ROM records the digital audio portion of a music CD (compact disc) in a CD-ROM format, and can record digital data instead of digital audio. In this embodiment, efficiency encoded video 1 data is stored in the digital data recording area on the CD-ROM.
Video 2 data and audio L/R (left/right) data are compressed in time axis and recorded in an interleaved manner as shown in FIG.

[0009] According to the CD-ROM standard, in mode 1,
It can record 153,000 bytes of digital data per second. The video data and audio data are encoded with high efficiency and recorded on the disk as digital data. For example, ADPDCM (adaptive differential coding method) is used as an efficiency coding method for audio data. In such an encoding method, the sampling frequency 32
When encoding is performed at 4 bits per sample at KHz, sound quality almost equivalent to that of FM radio can be obtained. When two channels of audio L/R are recorded using this encoding method, the amount of data is 32,000 (Hz) x 0.5 (bytes/sample) x 2 (channels) = 32,000 (bytes/second). Required per second. Therefore, the remaining 153,
000-32,000=121,600 (bytes/second)
can be used to record video data.

[0010] For example, Intel's DVITM is used as the efficiency encoding method for video data. When such an encoding method is used and video is sent at 30 frames/second, the NTS
You can get images with picture quality comparable to that of C TV. In this encoding method, the difference between the screens before and after transfer is sent as data for one screen of video, so if the video moves rapidly, the amount of data increases accordingly. Therefore, when the movement of the video to be recorded is rapid, the video data for one screen can be recorded in the maximum capacity [121,600 (bytes/byte)].
(seconds)], the video data is recorded on the disc with the data that exceeds the capacity cut off, so the resolution of the reproduced video for this portion is reduced accordingly.

By the way, on a music CD, control data called subcode data is recorded at the same track position as well as digital audio data. Such subcode data includes data indicating the song number of the song at the track position, the playback elapsed time of the song, and the total elapsed time from the disc start position. In addition, the lead-in area of the disc contains table of contents data (T
OC: Table of Contents) is recorded. Using such side information, you can search for songs,
It is possible to display the playback time, etc. The above CD-R
In OM, such sub-information is recorded on the disc in the same way as in the music CD. Therefore, a configuration similar to that of existing music CD players can be used to achieve the functions of the player using such sub-information.

Next, an embodiment of a karaoke apparatus using such a CD-ROM will be described with reference to FIG. Note that performance data serving as accompaniment is recorded in the audio data L/R on the disc.

Data recorded on a disk (CD-ROM) 1 is read out by a CD-ROM drive 2 and then sent to a CD-ROM control section 3. A single pickup is built into the CD-ROM drive 2,
This pickup sequentially reads data on the tracks shown in FIG. Among such data, video data 1
and video data 2 are stored in video data buffer A4 and video data buffer B5, respectively. Also, audio data L/R are stored in audio data buffer L13 and audio data buffer R14, respectively. After video data 1 and 2 are expanded from DIVITM data to video data by the video expansion section 6,
The data is stored in restored video memories A7 and B8. Then, one of the video data is sent to the display control section 10 via the switch 9, and converted into NTSC by the NTSC conversion section 11.
After being converted into a signal, it is played back by the NTSC monitor 12.

On the other hand, the audio data is sent from the audio data buffers L13 and R14 to the ADPCM audio decompression section 15, where it is decompressed into a PCM signal. After being converted into an analog signal by DA converters L16 and R17, it is sent to amplifiers 20 and 21 via mixers 18 and 19, where it is amplified and then output to the speaker 2.
It is output from 2 and 23. In addition, the singing voice collected by the microphone 24 is sent to the mixer 18 via the microphone IF 25.
19, is mixed with the accompaniment music from disk 1, and is output from speakers 22 and 23.

Selection of video data to be reproduced is performed by controlling the switch 9. Selection of such a switch is made using the operation section 2.
It responds to the command inputted in 6. Such commands are sent to the operating section IF.
27 to the timing control section 28. The timing control unit 28 performs switching control of the switch 9 in accordance with the command. Further, the timing control section 28 is controlled by the CPU 3.
1. It also controls the drive timing of the video decompression section 6, ADPCM audio decompression section 15, and display control section 10 in accordance with commands from the program ROM 30 and program RAM 29. Note that the timing control section 28 and the operation section IF 27
, CPU31, program ROM30, program RA
M29 constitutes the system control section 100.

A more specific music reproduction operation will be explained using the embodiment shown in FIG. First, set disk 1 to CD-
When the TOC information is set in the ROM drive 2 (step 1), the system control unit 100 reads the TOC information from the disk via the CD-ROM control unit 3.
This is stored in the internal program RAM 29 (step 2). When the song number of the song you want to sing is input on the operation unit 26 (step 3), the system control unit 100 checks the starting position address of the song from the TOC information (step 4) and instructs the CD-ROM drive 2 to play that address. command (step 5). The CD-ROM control unit 3 selects the types of data read out in this way (video data 1,
2 and audio L/R) (step 6),
If it is video data, it is transferred to video data buffers A3 and B4, respectively (step 7). If it is audio data, it is transferred to audio data buffers L5 and R6, respectively (step 15).

The video decompression unit 6 includes a video data buffer A4,
The video stored in B5 is decompressed (step 8), and each data is stored in restored video memories 7 and 8 (step 9).
). Thereafter, one of the data is selected by the switch 9 (step 10), and the selected data is read out from the corresponding restored video memory by the display control section 10 (steps 11 and 12). After that, the NTSC conversion is performed by the NTSC conversion unit 11 (step 13).
, is displayed on the monitor 12 (step 14).

On the other hand, the audio data buffer L13,
The audio data stored in R14 is ADPCM
After being read out and demodulated by the audio decompression unit 15 (step 16), it is converted into analog by the DA converters 16 and 17 (step 17). This analog signal is input to the microphone input via the microphone IF 25 (step 1).
8) (step 19), the amplifier 20, 2
1 (step 20), and the speakers 22, 2
3 (step 21).

At this time, the CD-ROM control section 3, video signal decompression section 6, display control section 10, and ADPCM audio decompression section 15 are controlled by the system control section 100 at a timing such that the video and audio are played back in synchronization. controlled. Further, a control program for the system control unit 100 is stored in an internal program ROM, and is executed by the CPU 31.

The above reproduction operation is repeated until one song is completed. That is, when the end of the song is detected in step 22, the playback operation is ended.

Now, during playback of a song, when a command to switch the reproduced video is inputted via the control unit 26, in response to this, the switch 9 is switched from, for example, terminal A to terminal B, and the display is displayed on the monitor 12. The video that will be displayed will be switched. At this time, since video data is always stored sequentially in both restored video memories 7 and 8, the video on the monitor 12 is instantaneously switched in response to such switching. Note that noise may actually appear on the screen during switching, so in order to eliminate this inconvenience, the switching is performed during the vertical ranking period of the video signal.

Although the embodiments of the present invention have been described above, it goes without saying that the present invention is not limited to these embodiments, and that various other modifications are possible. For example, in place of the data efficiency encoding method used in the normal trajectory embodiment, another method may be adopted. Further, in the above embodiment, data was recorded using the CD-ROM format, but the data is not limited to this, and data may be recorded on a disc of other formats. Furthermore, three or more types of video may be multiplexed onto the disc. Further, in the above embodiment, the reproduced video is switched by a command from the operation unit, but instead of this, the video may be switched by the player detecting a condition. For example, it is also possible to detect whether the singer is male or female based on a singing voice input through a microphone, and to switch the reproduced video according to this detection result.

[0023]

As described above, according to the present invention, it is possible to switch and reproduce several types of videos for one song, so that the visual effects can be improved compared to conventional karaoke devices. Further, even with a single pickup, images can be smoothly switched without causing interruptions in images. Furthermore, since the video data is recorded on the disc in a time-axis compressed state, the disc does not become large even if multiple types of video are recorded.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment.

FIG. 2 is a flowchart showing the operation of the embodiment.

FIG. 3 is a diagram showing the state of a recording signal of a video signal.

FIG. 4 is a diagram showing a data recording state in the embodiment.

[Explanation of symbols]

2 CD-ROM drive (reading means) 10 Display control section (video reproduction means) 11 NTSC control section (video reproduction means) 12 Monitor (video reproduction means)

Claims (1)

[Claims] 1. A disc playback device for playing back a disc on which a plurality of types of video data are digitally recorded together with audio data by compressing the time axis, comprising: a single pickup; A reading means for reading data in real time, an audio reproduction means for reproducing the read audio data, a video data selection means for selecting one of the read video data, and a video reproduction means for reproducing the selected video data. A disc playback device comprising: means.