JPS5837854A - Inspecting method for recording medium containing recorded information - Google Patents

Abstract

PURPOSE:To high efficiently inspect a recording medium, by loading both a recorded user program and an inspection program which commands a prescribed reproduction to a storage device of a reproducer and performing the reproduction of the program. CONSTITUTION:A program 1 recorded on a recording medium of a video disk, etc. comprises a user program 2 which gives a working command of reproduction to a disk player, etc. in order to transmit the information in a desired and satisfactory way and an inspection program 3 which functions to give a successive reproduction of static pictures to the frames corresponding to the frame n numbers emerging on the program 2. When an inspector operates the video disk player, the program 1 is loaded to the storage device of the player. Then the program 2 is executed, and the loading propriety is decided for the program 1 by observing the reproduced image. Afterwards, the defects such as a dropout of the frame number, etc. is checked based on a static image formed by the program 3. Thus an inspection of a recording medium including the loading propriety of the program 2 can be performed with high efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for inspecting a recording medium on which information is recorded.

For example, in an optical video disc system in which information can be reproduced by a pickup without contacting the recording medium, random access is used to extract a signal from any location on the recording medium disc, and still image is used to continue reproducing a signal from the same location. Reproduction is possible. A video signal obtained from a video disk transmits 30 images per second, similar to a video tape recorder or the like. Therefore, CA V (Consta
ntAngular Velocity) 30 [images/second] x 60 (seconds/minute) x 30 (minute), that is, 54,000 images are recorded on the disk. Each of these 54,000 images contains 1 to 54.
Frame numbers up to 000 are assigned. Based on this frame number, the video has a so-called program function that allows a program to automatically perform a playback operation of performing normal playback from the first predetermined frame to the second predetermined frame and then playing a still image from the third predetermined frame. Disk players have recently been provided for industrial use. A video disc player having such a program function is provided with a control device such as a microcomputer including a storage device. The information reproducing operation is controlled by a program loaded into a storage device in this control device.

In order to make effective use of such program functions, a so-called dump disk, which is a disk on which a user's program is recorded on an audio channel, is manufactured. is often configured to read from an audio channel and load it into storage. In the inspection process when manufacturing this dump disk, the frame number used in the user's program cannot be read due to so-called dropouts, which are signal loss caused by scratches or dirt on the disk. It is necessary to check whether there is a problem, or to judge whether the image quality of the still image frame is good or bad. Therefore, before inspecting the disc, a program is created as an inspection program to sequentially reproduce still images of all frames corresponding to the frame numbers appearing in the user's program for a predetermined period of time using the program function of the player. The quality of the disc is determined by the inspector observing the image that is loaded into the storage device of the player and reproduced according to the inspection program. However, since creating an inspection program takes time, there is a problem in that efficiency becomes extremely low when inspecting a plurality of discs having different recorded reuser programs. Furthermore, since the information read from the audio channel is ignored when determining whether the disc is good or bad, there is a risk that a defect such as a user's program recorded on the audio channel not being loaded correctly may be overlooked.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an information recording medium inspection method that makes it possible to efficiently inspect a recording medium, including checking whether the 0-code of a user's program is correct. It is.

The method for inspecting a recording medium on which information is recorded according to the present invention includes:
A test program is separately recorded on a recording medium for giving commands to a playback device so that frames assigned frame numbers used in a user's program are sequentially played back as still images, and the test program is stored in a storage device of the playback device. is loaded, and causes the playback device to perform a video playback operation based on the test program.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, 1 is a program recorded on an audio channel of a video disc as a recording medium. Program 1 includes a user's program 2 as shown in Table 1 for giving a reproduction operation command to a video disc player, which is a reproduction device, so that necessary and sufficient information is transmitted to the user. The inspection program 3 shown in Table 2 is configured to sequentially reproduce still images of frames corresponding to the frame numbers appearing in . The digital signal according to the program 1 is transmitted to a signal processing device that outputs a multiplexed signal consisting of a square wave whose repetition frequency represents image information and whose duty change represents audio information, for example, in a mastering process in a video disc manufacturing process. Supplied to the audio signal input terminal. Depending on the output of this signal processing device, the laser beam irradiated onto the glass master disc as a fine spot light is turned on and off. After being irradiated with laser light, the glass master disc is developed and becomes a master master disc.

Using this master disc, the video disc is duplicated as a dump disc in a replication process. In the inspection process, the dump disk is loaded into a video disk player having a programmable function by an inspector.

When the examiner operates the start button of the player, program 1 is loaded into the storage device of the player. After loading the program 1, the user's program 2 is executed. The inspector determines whether the program 1 has been correctly loaded by observing the obtained image. Next, after operating the reset button, the inspector operates a switch that specifies, for example, the program execution start address so that the start address of the area where the inspection program 3 is loaded in the storage device becomes the execution start address, and then presses the start button. operate. Then, the frame numbers appearing in the user's program 2 and the video information of the frames corresponding to the numbers are sequentially reproduced. Then, the inspector checks the reproduced image for defects such as missing frame numbers, and the inspection of the dump disk is completed.

In this method, the dance disc can be checked using only a player having a program function, and there is no need to separately provide a special device. In addition, since an inspection program is recorded for each dump disk, there is no need to create a new inspection program before starting the inspection of a dump disk on which a different user's program has been recorded. Even if it is, the inspection time will be shortened and the inspection process will be simplified. Note that the video playback operation performed by executing the user's program 2 is not affected by the inspection program 3.

FIG. 2 shows an example of a program with a smaller number of steps than the number of steps in the example program of FIG.

In FIG. 2, when the program 1 is loaded into the storage device of the player, a plurality of registers are set in a predetermined area in the storage device, and each of the frame numbers appearing in the user program 2 is assigned to each register as shown in Table 3. A data section 2a is provided so that the data is stored in the data section 2a. There is no direct frame number in the portion 2b other than the data portion 2a. The program 1 also includes an inspection program 3 for sequentially reproducing still images of video information of frames assigned frame numbers stored in each register. Therefore, by creating the test program 3 as shown in Table 4 so that no frame number exists in the test program 3, the test program 3 can be significantly shortened.

As detailed above, according to the method for inspecting a recording medium on which information is recorded according to the present invention, an inspection program for sequentially reproducing still images of video information in frames corresponding to frame numbers appearing in a user's program is installed on a storage medium. Since the inspection program is recorded on the storage device of the playback device and loaded together with the user's program, it is possible to efficiently inspect the dump disk, including checking whether the user's program is loaded correctly. be.

Table 1

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a program recorded on a recording medium in one embodiment of the present invention, and FIG. 2 is a block diagram of a program recorded in a recording medium in another embodiment of the present invention. Explanation of symbols of main parts 2... User's program 3... Inspection program

Claims (2)

[Claims] (1) Consisting of the following steps of inspecting a recording medium on which image information and a user's program etc. for giving instructions to a reproduction device to reproduce this image information in a predetermined reproduction method are recorded. A method for inspecting a recording medium on which information is recorded, characterized by: (a) An inspection program is recorded on the recording medium, including a step of giving a command to a reproduction device so that all frames corresponding to frame numbers appearing in the user's program are sequentially reproduced as still images. (b) Loading the user's program and the inspection program into a storage device in the playback device. (c) causing the playback device to execute at least the first step in the user's program in step (a); (d) causing the reproduction device to execute an image reproduction step in the inspection program; (2) The user's program is formed such that, when the user's program is loaded into the storage device, all frame numbers used in the user's program are stored in a predetermined area of the storage device. A data section exists, and the inspection program includes a program step of sequentially reading out the frame number stored in the predetermined area and instructing that the frame to which the frame number is attached is to be reproduced as a still image. An inspection method according to claim 1, characterized in that: