JP2000293850A - Information signal recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To report recording enable time by measuring a defect in the outer peripheral area of a recording medium precisely in comparison with middle and inner peripheral areas by reproducing recorded signals or recording and reproducing information while using a recording and reproducing means and a control means while the recording medium is not protected by a cartridge. SOLUTION: When an object optical disk 3 is loaded, after it is discriminated whether the optical disk 3 is protected by the cartridge or not, the defects in the inner and middle peripheral areas of the optical disk 3 are measured. At the time of measuring the inner and middle peripheries, measuring time is shortened by skip defect measurement. Next, the defect in the area outside the predetermined radius of an outer periphery rather than the outer peripheral radius of the optical disk 3 is precisely measured. While using the measured result and the management information of the disk 3, the non-recorded capacity of the disk 3 is found and recording enable time with the remaining capacity is displayed on a display device 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information signal recording / reproducing apparatus for compressing video information contained in an information signal at a predetermined rate and recording and reproducing the information on a disk-shaped recording medium.

[0002]

2. Description of the Related Art A DVD is well known as a recording medium, and a reproduction-only disk in which a video signal is encoded and recorded by the MPEG encoding method is already on the market. Further, a method of realizing a general-purpose product (consumer product) for recording and reproducing a video signal on a disk using a semiconductor laser is under development.

[0003] When encoding a video signal with high efficiency, a method of recording and reproducing on a recording medium by changing the code amount after encoding according to the complexity of the image is known as a variable rate method in relation to DVD. . When recording a video signal by the variable rate method, there is a large degree of freedom in the relationship between the video quality by encoding / decoding, the recording capacity, and the recording time.

A disk on which a video signal is recorded with high-efficiency encoding is recorded on a reproduction-only disk without using a cartridge (disc case) when mounted on a reproduction apparatus, as is known for DVDs. However, a disk for recording at hand of a user using a semiconductor laser may or may not use a cartridge. The former has a drawback that the disk is protected from defects such as fingerprints and scratches, but the recording medium and the recording / reproducing device are enlarged by the size of the cartridge. The latter is the opposite.

[0005] Normally, on a read-only board, recording is performed in a clean room, and valid information is continuously recorded and reproduced. However, in a disk for recording and reproducing at a user's hand using a semiconductor laser, defects on the disk (including the inside of the disk) deteriorate recording and reproducing performance. The effect of this deterioration is more severely affected when recording / reproducing a disk to be recorded / reproduced than when reproducing / reproducing a reproduction-only disk. This is because a defect on the disk has one bad effect during reproduction on the read-only disk, but has two bad effects on recording and reproduction on the recording / reproducing disk.

At the time of recording on the recording / reproducing board, if the recording is abnormal due to a local defect due to a fingerprint or other defect on the disk, defect processing is performed. Typical examples of the defect processing include a slip processing that is performed immediately after recording and an alternative processing that performs recording in a separately determined location. The latter has a large defect processing time including access time,
In recording video signals, slip processing is used in many cases.

[0007] At the initial operation of the recording / reproducing panel system, a conventional technique of performing a write test in a test block area in a disk, or interpreting an alternative management table in an easy-to-understand manner and recording it on the surface of a cartridge to inform the user is known. It is disclosed in Japanese Unexamined Patent Publication No. Hei 8-129458.
Also, in order to enable the recording device to recognize that the sensitivity characteristics and the like of the disc-shaped recording medium differ between the inner and outer peripheries, a conventional disc having test recording zones in both the innermost and outermost areas. The technology is known.

[0008]

When a recording disk is used without a cartridge, or when there is a cartridge and a recording disk is taken out from the cartridge and used, the fingerprint, the fingerprint, and the like are used as compared with the case where the recording disk is used.
Scratches, dirt, etc. tend to stick to the disk, and their influence increases.

In addition, when using without a cartridge, or when there is a cartridge and a recording disk is taken out from the cartridge and used, there are cases where the disk is newly started immediately after use and cases where the disk is old and has been handled many times. In general, the amount of fingerprints, scratches, debris, and the like attached to the disk differs greatly.

For this reason, when recording and reproducing a video signal on a bare recording disk, the appearance rate of defects (errors) due to fingerprints, scratches, dust, etc., depends on the quality of the recorded video and, consequently, on the recordable time (remaining recordable capacity). It will have a big impact.

[0011] The present invention has been made in view of the above points, and when recording and reproducing a video signal on a bare disk-shaped recording medium,
It is an object of the present invention to provide an information recording / reproducing apparatus capable of notifying a user of a recordable time based on a result of a defect measurement of the recording medium.

[0012]

In order to achieve the above object, an information signal recording / reproducing apparatus according to the present invention provides an information signal recording / reproducing apparatus in which a recording medium is in a naked state which is not protected by a cartridge.
The outer peripheral area of the recording medium is finely measured compared to the middle and inner peripheral areas, and a signal for displaying the recordable time on the recording medium on the display means is generated based on the measurement result. is there.

That is, according to the present invention, there is provided an information signal recording / reproducing apparatus for recording information on a disk-shaped recording medium and reproducing the recorded information, wherein the recording / reproducing means performs a recording / reproducing process on the recording medium. And control means for performing recording / reproduction control on the recording / reproduction means, wherein when the control means is in a naked state in which the recording medium is not protected by a cartridge, the recording / reproduction means and the control means By reproducing the recorded signal using
Or a measuring means for measuring the defect in the outer peripheral area of the recording medium more finely than the middle and inner peripheral areas by recording and reproducing information, and the defect measurement result in an unrecorded area and / or a designated recording area specified in advance. An information signal recording / reproducing apparatus, comprising: an arithmetic unit for calculating a recordable time on the recording medium based on the information; and a display signal generating unit for generating a display signal for displaying the recordable time. Is provided.

Further, an information signal recording / reproducing apparatus configured to compress information to be recorded at a variable rate is a preferred embodiment of the present invention.

Further, the display signal generating means displays a disk corresponding to the recording medium, and displays a mark corresponding to a fingerprint on an outer peripheral area of the disk as a defect measurement result, and displays a mark corresponding to the middle and inner circumferences. It is a preferred embodiment of the present invention that a display signal for displaying a mark corresponding to dust or a scratch is also generated in the area.

Further, the measuring means sets the boundary radius between the middle and outer peripheral regions of the recording medium from 5 to 10 mm from the physical outermost periphery of the disk toward the center, and sets the set outer peripheral region to It is a preferred embodiment of the present invention that measurement is performed more precisely than in the middle and inner peripheral regions.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an information signal recording / reproducing apparatus according to an embodiment of the present invention will be described in detail. First, a description will be given of a digital video disk recorder as a reference example as an information signal recording / reproducing apparatus of the present invention. The standard recording capacity is 4.7 GB as an example, and a recording rate of 4.7 Mbps on average including video signals and audio signals can be recorded and reproduced for 133 minutes.

Two types of disc-shaped recording media are considered when focusing on cartridges. First, it usually focuses on the use of cartridges, and exceptionally allows bare disks to be removed from cartridges. Second, a recording / reproducing apparatus for an optical disk in a naked state without requiring a cartridge is also allowed.
In any case, the user may have an opportunity to handle a bare optical disk.

In the case of a recordable optical disc as a disc-shaped recording medium for recording at hand of a user, the influence of stains and scratches such as fingerprints on the disc surface is more severe than in the case of a read-only disc. This is shown in FIG. (A) is a state of a reproduced signal recorded without a fingerprint and affected by a fingerprint during reproduction. (B) is recorded with a fingerprint and is also affected by a fingerprint during reproduction. It is a state of a reproduction signal. (A) is reproduced without an error, and (b) a large error occurs and a defect handling process is required. As described above, the influence of the fingerprint is large in the recording / reproducing disk, and the effective recording area is substantially reduced in the disk with the fingerprint.

A typical disk-shaped recording medium such as a CD-R or DVD has a start diameter at the inner periphery, and moves toward the outer periphery as recording and reproduction progress. The appearance of the fingerprint, for example, 12cm in diameter
As shown in FIG. 4, it can be seen that the number is overwhelmingly at the outermost periphery of the disk. Examining the typical bite error rate of a disk that has been handled a large number of times, as shown in FIG. 5, the outer radius is less than (−5 to 10) mm, that is, 5 to 10 mm from the outermost circumference toward the center. , The error rate is large.

On the other hand, in the use of a video disk recorder, for example, when a disc that has been recorded for 100 minutes is used, and how many minutes can be recorded, as a numerical example, it is important to determine whether the remaining time is 17 minutes or 33 minutes. It is. This numerical example corresponds to a case where a radius of 55 to 58 mm is completely annihilated by a fingerprint or the like and a case where there is no damage using a fixed recording rate of 4.7 Mbps on a CLV recording board. In the above, the importance and effect of taking in the influence of the fingerprint at the outer peripheral portion have been described with specific numerical examples.

Next, when recording / reproducing a video signal on a bare disk-shaped recording medium, the user can be provided with a defect of the recording medium,
Or, a specific embodiment according to the present invention that can predict the recordable time by notifying the error measurement result will be described.

FIG. 1 is a block diagram showing a main configuration example related to the present invention of a video disk recorder as an information signal recording / reproducing apparatus. The input television signal is encoded by the variable rate encoder 1.
The recording / reproducing unit 2 performs recording signal processing, reproduction signal processing, servo processing, and the like on the optical disk 3 as an information signal recording medium. The control unit 4 is a variable rate encoder 1
, A recording / reproduction control for the recording / reproduction unit 2, a display control for the display device 5, a user interface control, and the like. The control unit 4 has a CPU (Central Processing Unit), a memory, an interface, and the like (not shown), and also operates as a measurement unit, a calculation unit, and a display signal generation unit.

Next, the operation of the video disk recorder according to the above configuration will be described with reference to the flowchart shown in FIG. FIG. 2 is a flowchart showing the contents of control by the control unit 4. First, step S1
Is a step in which a recording start command is issued by the video disk recorder or the optical disk 3 is loaded. A step S2 decides whether or not the target optical disk is protected by a cartridge (disk case). At this point, the optical disk 3 having a history of being taken out of the cartridge in the past even if it is in the cartridge is classified as unprotected.

In step S3, the inner circumference of the optical disc 3
Defect measurement is performed in the middle area. At this time, the defect inspection of all the tracks takes too much time and is not practical, so that the inspection is skipped coarsely. In step S4, the outer radius of the optical disc 3-(5 to 10)
The defect is measured outside the predetermined radius of the outer circumference than mm, that is, the outer circumference area of 5 mm or more and 10 mm or less from the outermost circumference toward the center. In this region, the possibility that a fingerprint is given when the user holds the naked optical disk 3 with his / her hand is relatively higher than in the inner or middle region.
In order to measure this correctly, the defect measurement is performed more finely than when measuring the inner circumference and the middle circumference.

The defect measurement in steps S3 and S4 includes a method of measuring an error occurrence rate by performing test recording and reproduction, and a method of simply performing a reproduction operation without test recording and performing an error (defect) simply due to a drop in reflected light. Any of the methods of obtaining the predicted value of appearance rate may be used. Step S5
Then, the unrecorded capacity of the disc is obtained using the results of steps S3 and S4 and the disc management information. At this time, when calculating the recordable time, a portion having a defect is calculated as a non-recordable area based on a defect measurement result in an unrecorded area on the disk and / or in a designated recording area specified in advance. The designated recording area designated in advance is a case where an already recorded area is overwritten.

In step S6, using the result of step S5, the remaining recordable time is displayed on the display device 5 to notify the user. Also, if the data rate of the recording signal is changed, the recordable time will, of course, change.
Trade-off between recording quality and recording time (can be converted to each other)
Notify the user, including the relationship. When the target disk is protected by the cartridge as branched in step S2, the process branches as indicated by an arrow, and steps S3 to S5 can be omitted.

Next, an example will be described in which a mark corresponding to dust, a scratch, or a fingerprint is displayed on the display device 5 as the defect measurement result in addition to the recordable time. in this case,
Defects (or errors) in the inner and middle areas of the optical disc 3 are marked with dust and scratches that are not fingerprints, and defective (or errors) in the outer areas are marked with fingerprints. Then, the user is informed of the dirty state of the disk by the corresponding mark on the disk-shaped display.

The cause of defects on the outer periphery is that the number of fingerprints is relatively large, and with respect to fingerprints, if the user pays attention to the handling of a disk that is not protected by a cartridge, it is possible to significantly reduce the adhesion of fingerprints. Therefore, the fingerprint on the outer peripheral portion of the disk is displayed in an easy-to-understand manner for the user to alert the user. This display corresponds to the defect measurement just measured in steps S1 and S3, and it is difficult to perform a defect inspection on the entire surface of the disk in detail.
The middle area is presumedly determined to be a general defect, and the outer area is presumably determined to be a fingerprint to notify the user. As an example, as shown in FIG. 6, a general defect in the inner peripheral area and the middle peripheral area is XX.
The X mark and the fingerprint mark in the outer peripheral area are displayed as a triple circle. The user can be notified by such a divided display.

The information signal recording / reproducing apparatus of the present invention described above is summarized as follows. In the case where the disc-shaped recording medium is used without a cartridge, or when the disc-shaped recording medium is used even when a cartridge is used, and when the disc-shaped recording medium is used in a cartridge, the influence measurement of defects such as fingerprints, scratches, and dust in an unrecorded area is handled separately.

Further, it has been found that there are many fingerprints in the outer peripheral area with respect to the inner, middle and outer peripheral areas of the disk, and this fact is incorporated into the estimation of the recordable time. In order to measure the effect of fingerprints, the radius of the boundary between the middle and outer circumferences of the disk should be between 5 and 10 mm inward from the physical outermost circumference of the disk, and defect measurement should be performed on the inner circumference. A sequence for performing the measurement easily and more carefully (finely) on the outer periphery is provided. As a result of examining many disks, the fingerprint is the physical outer radius of the disk-(5 to 10) m
This is because it has been found that they are distributed more on the outer periphery than m.

Although the above embodiment has been described by taking a DVD as an example, the present invention is not limited to a DVD, but may be a CD-R or a recording medium of various recording media which will be developed or standardized in the future. It is applicable to possible recording media.

[0033]

As described above, according to the present invention, when recording / reproducing a video signal on a bare disk-shaped recording medium, the outer peripheral area of the recording medium is measured more finely than the middle and inner peripheral areas. Then, the recordable time on the recording medium (recordable time in the unrecorded area and / or in the designated recording area specified in advance) is displayed on the display means based on the measurement result. The remaining recordable time based on the result of the defect measurement of the recording medium can be notified to the user, and the time required for the measurement can be shortened.

[Brief description of the drawings]

FIG. 1 is a block diagram showing main components related to the present invention in a video disc recorder as an embodiment of an information signal recording / reproducing apparatus of the present invention.

FIG. 2 is a flowchart showing control contents by a control unit 4 of FIG. 3;

FIG. 3 shows a reproduction waveform of a defect portion on an optical disc, wherein (a) shows a state of a reproduction signal recorded without a fingerprint and affected by a fingerprint at the time of reproduction;
(B) is a diagram showing a state of a reproduced signal recorded in a state with a fingerprint and being affected by the fingerprint during reproduction.

FIG. 4 is a diagram showing a state of a defect on a disk or in a disk.

FIG. 5 is a graph showing a relationship between a radius of a disc and an error rate as a result of measuring a defect.

FIG. 6 is a diagram showing an example in which the distribution of defects obtained as a result of measuring defects on a disc according to the present invention is displayed as an image.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Variable-rate encoder 2 Recording / reproducing part (recording / reproducing means) 3 Optical disk (disk-shaped recording medium) 4 Control part (control means: measuring means, arithmetic means,
(Including display signal generating means) 5 Display device

Claims (3)

[Claims] 1. An information signal recording / reproducing apparatus for recording information on a disk-shaped recording medium and reproducing the recorded information, comprising: a recording / reproducing means for performing a recording / reproducing process on the recording medium; Control means for performing recording / reproduction control on the recording medium, wherein the control means uses the recording / reproduction means and the control means to record a recording signal when the recording medium is in a naked state which is not protected by a cartridge. Measuring means for performing finer defect measurement of the outer peripheral area of the recording medium by reproduction or by recording and reproducing information as compared to the middle and inner peripheral areas; and measuring the defect in an unrecorded area and / or in a designated recording area designated in advance. Calculating means for calculating a recordable time on the recording medium based on a defect measurement result; and for displaying the recordable time. Information signal recording and reproducing apparatus characterized by comprising a display signal generating means for generating a display signal. 2. The information signal recording / reproducing apparatus according to claim 1, wherein said information to be recorded is compressed at a variable rate and then recorded. 3. The information signal recording / reproducing apparatus according to claim 1, wherein the display signal generating means displays a disk corresponding to the recording medium, and outputs a fingerprint on an outer peripheral area of the disk as a defect measurement result. An information signal recording / reproducing apparatus characterized in that the information signal recording / reproducing apparatus is configured to display a mark corresponding to the mark, and to generate a signal for displaying a mark corresponding to a dust or a scratch in the middle and inner peripheral areas. .