JPH08307828A - Video reproducing device - Google Patents

Abstract

PURPOSE: To preclude the possibility of reproducing a still image on a monitor screen or being a black screen state on the way of reproduction of moving image data by revising a read speed of a read means and a rotating speed of a drive means when read failure of video data is detected so as to control the device to execute reading again. CONSTITUTION: Reading of image data is carried out of an image recording disk of CD-ROM drives 60a-60d and when the data are illegible, retrial is implemented. When the data are illegible regardless of nearly five times of retrial, the data are regarded as defective chapter. A CPU 38 counts the number of defective chapters and when the number exceeds 5, the disk is discriminated to be a defective disk and it is commanded to the drives 60a-60d storing the defective disk to control the disk at a double speed. Then the read speed is doubled and the number of times of retrial is revised into 10 times. Thus, even when there is much dirt, dust or flaw, a defect of an image such as reproduction of a still image or a black screen can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reproducing apparatus for reproducing an image output from a recording disk on which an image output from a monitor such as a karaoke system is recorded.

[0002]

2. Description of the Related Art Conventionally, in a video karaoke apparatus, a video disk or the like in which video data and performance data are stored is reproduced for each musical piece to be played. So many video discs were needed to hold the songs. Then, these video discs were stored in a dedicated storage case, and the disc that was requested was automatically selected by using an autochanger, etc., but the area occupied by the storage case and the autochanger was very large. Since it is large, it has been required to be compact especially for commercial use.

Therefore, a karaoke system that has been realized as one of the compactification plans is to store video data and performance data separately and synthesize them when playing a song.

In recent years, there has been an increasing demand for a CD-ROM drive which stores data in a compact disc and is used as a CD-ROM as a peripheral device of a personal computer, but in the above-mentioned karaoke system, video data is compressed in the CD-ROM. A video reproducing device for storing the data is used. As for the CD-ROM drive, the data transfer speed is slower than that of other memories such as HDD.
The data transfer speed can be doubled, tripled, or quadrupled (doubled, tripled, or quadrupled by turning the rotation speed of doubled, tripled, or tripled).
Double speed) is also available.

[0005]

However, in the conventional video reproducing apparatus as described above, when the disk has a lot of scratches, dust, dirt, etc., and the video data cannot be read accurately, the retry is repeated several times. I try to read the video data correctly by doing so, but if the video data cannot be read within the time to play it, even if the video data is a moving image, the monitor screen becomes a still image, or There was a problem that the black screen state was not displayed.

In order to avoid this, it is possible to increase the time until reproduction by increasing the capacity of the buffer memory that temporarily stores the read video data.
There is a problem of enormous cost.

The present invention has been made to solve the above-mentioned problems, and there is a possibility that a still image may be reproduced on the monitor screen or a black screen may appear during the reproduction of moving image data. It is an object of the present invention to provide a video reproducing device that can be lowered.

[0008]

In order to achieve this object, a video reproducing apparatus of the present invention comprises a reading means for reading the video data from a recording disk on which the video data is recorded, and the video data by the reading means. Driving means for rotating the recording disk at the time of reading, detecting means for detecting a read failure of the video data by the reading means, and read speed of the reading means and the reading speed when the read failure is detected by the detecting means. And a control means for changing the rotation speed of the driving means and controlling so that the read operation can be executed again.

It is preferable that the video reproducing apparatus has a storage means for temporarily storing the video data read by the reading means.

Further, specifically, the control means may control the read speed of the read means and the rotation speed of the drive means to be higher than usual when the read failure is detected by the detection means. Absent.

Further, it is desirable that the control means be capable of controlling the number of tries for reading by the reading means to be larger than usual when the reading failure is detected by the detecting means.

Further, the control means has a judging means for judging the degree of malfunction of the recording disk based on the detection result of the detecting means, and the reading speed and the driving of the reading means based on the judgment result of the judging means. It may be controlled to change the rotation speed of the means.

[0013]

The video reproducing apparatus of the present invention having the above structure is
When the detection means detects the read failure of the video data by the read means, the control means changes the read speed of the read means and the rotation speed of the drive means, and controls so that the read operation can be executed again.

In the case where the storage means is provided, the video data read by the reading means is temporarily stored in the storage means and is sequentially reproduced.

More specifically, for example, the control means controls the reading speed of the reading means and the rotation speed of the driving means to be higher than usual.

Further, the control means controls so that the number of read trials by the read means is increased more than usual.

When the control means has a judging means, when the judging means judges the degree of malfunction of the recording disk based on the detection result of the detecting means, the reading speed of the reading means and the reading speed of the reading means are judged based on the judgment result. The rotation speed of the drive means is controlled to be changed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

First, the outline of the structure of a karaoke system embodying the present invention will be described with reference to the block diagram shown in FIG. 1. The karaoke system includes a commander 10, a disc player 30, an amplifier mixer 50, a speaker 52, and a microphone 54. , Monitor television 56, and the like.

In this karaoke system, the user can select a song to be sung by operating the commander 10. Lyrics data and performance data are stored in the commander 10 as music data, and when a music piece is selected, the commander 10 is configured to output the lyrics data and the performance data in synchronization. Then, finally, the user sings a song in accordance with the performance output from the speaker 52 while referring to the lyrics displayed on the monitor television 56.

The performance data output from the commander 10 is converted into an analog performance signal and then sent to an amplifier mixer 50 to be electrically amplified and the microphone 5
It is mixed with the user's singing voice input via 4 at an appropriate ratio. Then, the mixed audio signal is output to the outside by the speaker 52 as a musical performance by various musical instruments.

On the other hand, the commander 10 is synchronized with the performance data.
The lyric data read from is synthesized (superimposed) with the NTSC video signal sent from the disc player 30 and displayed on the monitor television 56. The NTSC video signal sent from the disc player 30 is generated by the disc player 30 reproducing a moving image reproduction disc. Here, the NTSC video signal is
When the user sings while referring to the lyrics, the monitor TV 56
This is the background image displayed on.

The serial input / output circuit (SIO) 16 is an interface circuit for transmitting the genre of the selected song to the disc player 30 via the serial communication line 17, and in the present embodiment, serial communication. RS232C cable is used as the line.

The video mixer 24 is a hard disk 20.
This is a device for synthesizing the lyrics data sent from the computer and the NTSC video signal sent from the disc player 30, and the color of the lyrics displayed by the device is gradually synchronized with the output of the musical instrument. Therefore, the user can be informed of the corresponding singing part.

Next, the disc player 30 will be described with reference to FIG.
The configuration of will be described.

The disc player 30 sends a moving image of a corresponding genre to the commander 10 as an NTSC video signal based on the genre information of the music sent from the commander 10. In this disc player 30, a moving image reproducing disc (not shown). A video signal is generated by reproducing the.

The moving image reproducing disc used in this embodiment is a 12 cm CD (compact disc) size video disc, and since the moving image data is compressed and stored in the MPEG system, it is a CD size disc. One hour's worth of moving images are stored in each sheet.

Next, the internal structure of the disc player 30 will be described. The disc player 30 includes a serial input / output circuit (SIO) 32, four CD-ROM drives 60a, 60b, 60c, 60d, a ROM 33, and an RA.
An M35, an image memory 31, a CPU 38, a SCSI controller 39, a compressed data decoding circuit 42, an NTSC converter 44, etc. are provided.

The serial input / output circuit (SIO) 32 is an interface circuit for receiving the genre information of the selected music piece from the commander 10.

Four CD-ROM drives (first CD-
ROM drive 60a, second CD-ROM drive 60
b, third CD-ROM drive 60c, fourth CD-RO
The M drive 60d) is a player for selecting and reproducing a moving image reproducing disc in which the distribution of the video genres classified by taste is a predetermined ratio.

The SCSI controller 39 has four CDs.
A circuit for selecting one of the ROM drives 60a, 60b, 60c, 60d to read data. In this embodiment, two CD-ROM drives are selected out of four to read each data. Are switched at fixed time intervals (for example, 30 seconds), and moving images of the relevant genre can be played in order.

The CPU 38 is a microcomputer that controls the operation of the entire disc player 30, and is an SCS.
The digital data read from the I controller 39 is sent to the compressed data decoding circuit 42.

The compressed data decoding circuit 42 is an electric circuit for decoding the compressed digital data sent from the SCSI controller 39 into a video signal. The video signal decoded by the compressed data decoding circuit 42 is NT.
It is adapted to be sent to the SC converter 44.

The NTSC converter 44 is an electric circuit for converting the video signal decoded by the compressed data decoding circuit 42 into a commercial color television signal (NTSC video signal). The NTSC video converted by the NTSC converter 44 is used. The signal is the video mixer 2 of the commander 10.
It will be sent to 4.

Next, four CD-ROM drives 60
FIG. 3 shows the internal configuration of a, 60b, 60c, and 60d.
Will be explained. As shown in FIG. 3, the CD-R0M drive 60 includes an optical pickup 62, a spindle motor 63, a digital signal processing circuit 64, and a speed control circuit 6.
5, error correction control circuit 66, SCSI controller 6
7, a focus / tracking servo circuit 68, a system control CPU 69, and the like, which allow data to be read from the moving image reproducing disk 61.

Video data of 140 chapters in total is stored in the moving picture reproducing disc 61, with each video of 30 seconds as one chapter.

The optical pickup 62 is a unit that converts the data stored in the moving image reproducing disk into an electric signal by using laser light. The spindle motor 63 is a motor for rotating the moving image reproducing disc at a predetermined rotation speed, and is controlled by the speed control circuit 65. The signal read from the optical pickup 62 is digitized by the digital signal processing circuit 64, error-corrected by the error correction control circuit 66, and S
It is adapted to be sent to the SCSI interface 37 with the outside by the CSI controller 67.

Focus / tracking servo circuit 68
Is to accurately cause the laser light emitted from the optical pickup 62 to follow a recording track of a moving image reproducing disc (not shown).
It is a microcomputer that controls the operation of the entire ROM drive 60.

In this embodiment, the digital signal processing circuit 64, the error correction control circuit 66, and the system control C
The control structure of the PU 69 serves as a detecting means for detecting a defective portion of the moving image reproducing disk, such as CPU 38, ROM 33, RA
The control structure of the M35 serves as a determination means, and the spindle motor 63, the digital signal processing circuit 64, the speed control 65, and the control structure of the system control CPU 69 function as speed changing means.

Here, with the configuration described above, for example, the two CD-ROM drives 60a and 60b are rotated at a normal speed and switched at a constant interval (30 seconds), so that the CD
-In the ROM drive, when one chapter is selected from the movie of the relevant genre specified by the commander and played in order, the image recording disc has some dust, dirt, scratches, etc. If the circuit 66 cannot read the image data, it becomes impossible to send the image data to the compressed data encoding circuit 42, and the displayed image becomes a still image or a black screen in which nothing is displayed. I will end up.

Then, the system control CPU 69 gives an instruction to read the same area again. This operation is generally called a retry. If you can't read it after reading again, instruct you to read the same part again and repeat the retry until you can read it. Considering that such image data cannot be read, the read image data is once stored in the image memory 31 and then sent to the compressed data encoding circuit 42. By doing so, even during the retry, the image data stored in the image memory 3 is sequentially sent to the compressed data encoding circuit 42 and is used for reproduction, resulting in a defect such as a still image or a black screen. Can be prevented. For example, if the image memory 31 has a data capacity that requires 5 seconds for reproduction, there is no problem if the retry operation can be performed and read within 5 seconds.

However, in the case where the data cannot be read even by the retry that can be done within 5 seconds, the still image or the black screen is displayed.
However, it is unpleasant for the singing person that the background image of the karaoke system is a still image or a black screen.

The control operation of the disc player, which is the main part of the karaoke system of this embodiment, will be described below with reference to the flow chart shown in FIG.

First, an operation of reading image data from the image recording disk is executed, and it is judged whether or not the image data can be read (S1). If the image data cannot be read, a message to that effect is given to the CD-ROM drive 60. Responds to the CPU 38 through the SCSI controller 39 and retries (S2). Next, it is judged whether or not the image data can be read by the retry (S3), and if the image data cannot be read, the number of retries is counted (S4). Then, it is judged whether or not the number of retries exceeds 5, and if the number of retries does not exceed 5, the above-described series of retry operations are performed again. On the other hand, if the image data can be read within 5 retries, the read image data is stored in the image memory (S10).

If the data cannot be read even after retrying 5 times due to dust or scratches, this chapter is judged to be a defective chapter (S6) and stored in a defective chapter number memory (not shown). Then, the number of defective chapters is counted (S7), and it is determined whether or not the number of defective chapters exceeds 5 (S8). If the number of defective chapters exceeds 5, the currently used image reproducing disc is selected. It is determined that the disk is defective (S9).

After that, when reproducing the image reproducing disc judged as the defective disc, the CPU 38 instructs the CD-ROM drive 60 storing the defective disc to control at double speed (S11). Based on this, the system control CPU 69 controls the speed control circuit 65
By instructing control at double speed and rotating the spindle motor 63 at double speed, the amount of data that can be read in a fixed time is doubled, and the number of retries is set to two.
The number is changed to 10 times (S12). By doubling the speed of reading image data in this way, the number of retries that can be performed within a fixed time by the image memory even if the image recording disk is difficult to read due to dirt, dust, scratches, etc. Since it can be doubled, it is possible to prevent image defects such as still images and black screens.

Here, it is conceivable to use an image memory having a large capacity as a means for increasing the number of retries within a fixed time, but this is not a preferable means because it causes a great increase in cost. It is also possible to rotate the CD-ROM drive at double speed from the beginning, but this is not a preferable means as it may increase power consumption and shorten the life.

As described above, in the karaoke system of this embodiment, it is detected that the image recording disk to be used has a defective portion due to dirt such as scratches and dust, and it is determined that the disk has many defective portions. If the disc is judged to have many defective parts, the CD-ROM drive should be rotated at double speed and the data read speed should be doubled to double the number of retries. This makes it possible to prevent reproduction of a defective image such as a still image or a black screen.

Further, since the moving picture recording disk of the present embodiment uses the data compression technique, and the moving picture for one hour is stored in the disk of the CD size, the disk is compared with the conventional video disk. There is an advantage that the player 30 can be small. However, even in the case of the conventional video disc, the same effect as that of the present invention can be obtained by changing the structure so that the data reading speed can be doubled by rotating the video disk twice.

The present invention is not limited to the embodiment described in detail above, and various modifications can be made without departing from the spirit of the invention.

For example, in this embodiment, four CD-ROMs are used.
Although the drives 60a, 60b, 60c, and 60d are used, the number of drives may be one.

Further, it is possible to execute the read operation again at a speed slower than usual for the recording disk having the read failure.

Furthermore, it is possible to control the CD-ROM drive containing the recording disk with the read failure to not be used thereafter.

It is also possible to store the number of read tries and perform read control based on the value when the next request is read.

[0055]

As is clear from the above description,
According to the video reproducing apparatus of the present invention, the read speed of the read means and the rotation speed of the drive means are changed and the read operation is performed again for the recording disk which could not read the video data well in the normal read operation. Since it can be performed, the possibility that the video data can be read is increased, and thus the possibility that a still image is reproduced on the monitor or a black screen state is generated can be reduced.

Further, when the storage means for temporarily storing the read video data is provided, the read try by the read means may be performed only for the time required for reproducing the video data stored in the storage means. Therefore, if the control means controls the reading speed of the reading means and the rotation speed of the driving means to be faster than usual, and also controls the number of read tries by the reading means to be higher than usual, the video data is further recorded from the recording disk. It is possible to increase the probability of reading.

Further, when the control means has the judgment means, it becomes possible to change the read speed of the read means and the rotational speed of the drive means according to the degree of the malfunction of the recording disk. It is possible to perform efficient read control.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a karaoke system of this embodiment.

FIG. 2 is a block diagram showing a configuration of a disc player installed in the karaoke system.

FIG. 3 is a CD-RO mounted on the karaoke system.
It is a block diagram which shows the structure of M drive.

FIG. 4 is a flowchart showing a control operation of the disc player.

[Explanation of symbols]

 30 Disc Player 31 Image Memory 33 ROM 35 RAM 38 CPU 56 Monitor Television 60 CD-ROM Drive 61 Video Playback Disc 62 Optical Pickup 63 Spindle Motor 65 Speed Control Circuit

Claims (5)

[Claims] 1. A reading means for reading the video data from a recording disk on which the video data is recorded, a driving means for rotating the recording disk when the reading means reads the video data, and an image for the reading means. Detecting means for detecting a data read failure, and when the read failure is detected by the detecting means, the read speed of the read means and the rotation speed of the drive means are changed so that the read operation can be executed again. A video reproducing apparatus comprising a control means. 2. The video reproducing apparatus according to claim 1, further comprising a storage unit that temporarily stores the video data read by the reading unit. 3. The control means controls the read speed of the read means and the rotation speed of the drive means to be higher than usual when the read failure is detected by the detection means. Video playback device. 4. The video reproducing apparatus according to claim 3, wherein said control means controls, when the detection failure is detected by the detection means, to increase the number of trials for the reading by the read means to be larger than usual. apparatus. 5. The control means has a judging means for judging the degree of malfunction of the recording disk based on the detection result of the detecting means, and the reading speed and drive of the reading means based on the judgment result of the judging means. The video reproducing apparatus according to claim 1, 2, 3, or 4, wherein the rotation speed of the means is controlled.