JP3663650B2 - Optical disk signal inspection device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an optical disk signal inspection apparatus for guaranteeing the function of an optical disk apparatus.
[0002]
[Prior art]
A conventional optical disk signal inspection apparatus will be described below with reference to the drawings.
[0003]
First, the configuration of the optical disk device will be described.
FIG. 5 is an explanatory diagram showing the configuration of the optical disk device.
[0004]
As shown in FIG. 5, the optical disk device has an optical pickup 4 for reading information on the optical disk 13, a motor 5, an amplifier 6, a servo circuit 7, a signal processing circuit 8, a sub CPU 9 for controlling these, and the like. The optical disk drive unit 1 and the interface unit 2 having a decoder 10 for processing various data output from the optical disk drive unit 1 and correcting an error by the error correction circuit 11, a CPU 12, and the like. The signal reproduced by the optical disk drive unit 1 is processed by the interface unit 2 and sent to the host 3 as read data.
[0005]
In the signal inspection of such an optical disk device, first, a command is issued from the host 3 using a standard test disk, and data is read by the optical disk drive unit 1. Then, this data is sent from the decoder 10 of the interface unit 2 to the host 3 to check whether the optical disk drive unit 1 is operating normally by checking data errors.
[0006]
[Problems to be solved by the invention]
In the signal inspection with the above configuration, since the signal inspection is performed via the interface unit 2, it is not possible to perform the inspection of only the optical disk drive unit 1.
[0007]
The decoder 10 of the interface unit 2 includes an error correction circuit 11 that corrects errors of various data output from the optical disk drive unit 1. As a result, even if there is a slight error in the optical disk drive unit 1, the data output to the host 3 side is error-corrected by the error correction circuit 11 of the decoder 10, so that the optical disk drive unit 1 An error cannot be detected as to whether it is operating normally.
[0008]
Therefore, the optical disk drive unit 1 has a problem in that the function of the optical disk device cannot be reliably guaranteed due to, for example, an error that cannot be corrected by the error correction circuit 11 occurs suddenly.
[0009]
In order to solve the above problems, the present invention can accurately check whether the optical disk drive unit 1 is operating normally, and can reliably guarantee the function of the optical disk device. The object is to provide a device.
[0010]
[Means for Solving the Problems]
To achieve the above object, the present invention provides an optical disk device comprising an optical disk drive unit for reproducing information on an optical disk and an interface unit, and an input for inputting a disk output signal before error correction output from the optical disk drive unit. And a plurality of monostable multivibrators connected to the input unit and having a constant time constant, and an output unit connected to the plurality of monostable multivibrators, and detecting an error in the disk output signal It is what.
[0011]
[Action]
According to the above configuration, the disc output signal output from the standard test disc has a constant frequency and the period thereof is known, so that the disc output signal is supplied to a monostable multivibrator having a constant time constant. When a normal disk output signal is output, the output from the monostable multivibrator becomes H level, for example. If the normal disk output signal is not output, the output from the monostable multivibrator is For example, it becomes L level, and it is possible to accurately check whether the optical disk drive unit is operating normally.
[0012]
【Example】
(Example 1)
The optical disk signal inspection apparatus according to the first embodiment of the present invention will be described below with reference to the drawings.
[0013]
FIG. 1 is an explanatory view showing a configuration at the time of inspection by the optical disk signal inspection apparatus, and FIG.
[0014]
As shown in FIG. 1, the optical disk signal inspection device receives a disk output signal output from the optical disk drive unit 1 in an optical disk device including an optical disk drive unit 1 for reproducing information on the optical disk 13 and an interface unit. An input terminal 14, two monostable multivibrators 15 connected to the input terminal 14 and having a constant time constant, and an output terminal 16 connected to the monostable multivibrator 15.
[0015]
Such an optical disc signal inspection apparatus is connected to the optical disc drive unit 1 and connected to a personal computer 17 that sends commands to the optical disc drive unit 1 and checks output signals from the monostable multivibrator 15. Yes.
[0016]
The optical disk drive unit 1 has an optical pickup 4 for reading information on the optical disk 13, a motor 5, an amplifier 6, a servo circuit 7, a signal processing circuit 8, a sub CPU 9 for controlling these, and the like.
[0017]
The operation of the optical disk signal inspection apparatus having the above configuration will be described below.
[0018]
Among the signals output from the drive unit 1, there are SRDT, SRCK, LRCK, SUBQ, BLKCK, and CLDCK as main disk output signals indicating the operation state of the drive. SRDT is serial read data, SRCK is a data clock, LRCK is a synchronization clock every 2 bytes, SUBQ is a subcode signal indicating an address, BLKCK is a block clock, and CLDCK is a frame clock. Of these signals, the BLKCK signal will be described as an example. BLKCK is a pulse that is output with a period of 13.3 mS when the drive unit 1 is operating normally. Therefore, if this period is confirmed, the normal operation of the drive unit 1 can be confirmed. Therefore, as shown in FIG. 2, if the BLKCK signal is input as a disk output signal to the monostable multivibrator 15 having a time constant of about 1.5 times the pulse interval, for example, the output signal of the monostable multivibrator 15 is H. Status signal is obtained and input to the personal computer to determine whether the signal is H or L, and it is determined whether the BLKCK signal is output normally or an abnormal signal is output due to a drive malfunction. be able to.
[0019]
As described above, according to the first embodiment, when a disc output signal is input to the monostable multivibrator 15 having a constant time constant, if a normal disc output signal is output, the monostable multivibrator is output. If the output from 15 is H level and a normal disc output signal is not output, the output from the monostable multivibrator 15 is L level, and the optical disc drive unit 1 is properly inspected for proper operation. And the function of the optical disk device can be reliably ensured.
[0020]
(Example 2)
The optical disk signal inspection apparatus according to the second embodiment of the present invention will be described below with reference to the drawings.
[0021]
FIG. 3 is an explanatory diagram showing the configuration of the optical disk signal inspection apparatus, and FIG. 4 is a waveform diagram during the inspection of the optical disk signal inspection apparatus.
[0022]
The optical disk signal inspection apparatus according to the second embodiment is the same as the optical disk signal inspection apparatus according to the first embodiment, except that a plurality of monostable multivibrators 15 having different time constants are provided, and the monostable multivibrator 15 is provided. Are provided with a logic circuit for calculating the logic of the outputs from the plurality of output units connected respectively.
[0023]
As shown in FIG. 3, the optical disk signal inspection apparatus has an input terminal 14 for inputting a disk output signal output from the optical disk drive unit 1, and two input terminals connected to the input terminal 14 and having a constant time constant. Monostable multivibrators 17 and 18, a NAND circuit 19 that receives the outputs of the two monostable multivibrators 17 and 18, a monostable multivibrator 20 that receives the output of the NAND circuit 19, and a monostable multivibrator A circuit 21 for inputting the output of the vibrator 20 and the output of the monostable multivibrator 17 and a circuit 22 for inputting the output of the circuit 21 are provided.
[0024]
The time constants of the monostable multivibrators 17 and 20 are 1.5 times the time constant of BLKCK, and the monostable multivibrator 18 is 0.5 times of the time constant of BLKCK.
[0025]
The operation of the optical disk signal inspection apparatus having the above configuration will be described below.
As shown in FIG. 4A, when a normal BLKCK signal is input, the output of the monostable multivibrator 17 is an H level, the output of the monostable multivibrator 18 is a pulse signal, and the logic output from the circuit 22 It can be seen that the product output is always at the H level and is a normal signal.
[0026]
On the other hand, as shown in FIG. 4B, when an abnormal signal having a pulse interval of 1.5 times or more of the BLKCK signal is input due to a malfunction of the optical disk drive unit 1, the monostable multivibrators 17 and 18 Both outputs are pulse signals, and the logical product output from the circuit 22 is also a pulse signal, which indicates that it is not a normal signal.
[0027]
As shown in FIG. 4C, when an abnormal signal having a pulse interval of 0.5 times or less of the BLKCK signal is input, the outputs of the monostable multivibrators 17 and 18 are both at the H level. The logical product output from 22 is always at L level, indicating that it is not a normal signal.
[0028]
As described above, according to the second embodiment, a plurality of monostable multivibrators 17, 18, and 20 having different time constants are provided, and a plurality of monostable multivibrators 17, 18, and 20 are connected to the monostable multivibrators 17, 18, and 20, respectively. Since the logic circuit for calculating the logic of the output from the output section of the optical disk drive unit 1 is provided, it is possible to inspect whether the disk output signal of the optical disk drive unit 1 input from the input terminal 14 is a normal signal or an abnormal signal. In addition, it is possible to inspect the waveform state of the signal, and to ensure the function of the optical disk device.
[0029]
【The invention's effect】
As described above, according to the present invention, there is provided an optical disk signal inspection apparatus capable of accurately inspecting whether the optical disk drive unit is operating normally and reliably guaranteeing the function of the optical disk apparatus. Is something that can be done.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a configuration at the time of inspection by an optical disk signal inspection apparatus according to a first embodiment of the present invention. FIG. 2 is a waveform diagram at the time of inspection by the optical disk signal inspection apparatus. FIG. 4 is a block diagram showing the configuration of an optical disk signal inspection apparatus according to a second embodiment. FIG. 4 is a waveform diagram at the time of inspection of the optical disk signal inspection apparatus. Explanation of]
1 Optical Disk Drive Unit 4 Optical Pickup 5 Motor 6 Amplifier 7 Servo Circuit 8 Signal Processing Circuit 9 Sub CPU
13 Optical disk 14 Input terminal 15 Monostable multivibrator 16 Output terminal 17 Personal computer

Claims (2)

In an optical disk device comprising an optical disk drive unit for reproducing information of an optical disk and an interface unit, an input unit for inputting a disk output signal before error correction output from the optical disk drive unit, and a constant connected to the input unit An optical disk drive unit inspection apparatus that includes a plurality of monostable multivibrators having time constants and an output unit connected to the plurality of monostable multivibrators, and detects an error in the disk output signal . First and second monostable multivibrators connected to the input unit and having different time constants, a first logic circuit for calculating the logic of each output of the first and second monostable multivibrators, and the first A third monostable multivibrator connected to the first logic circuit, and a second logic circuit for calculating the logic of the outputs of the third monostable multivibrator and the first monostable multivibrator. 2. The optical disk drive unit inspection apparatus according to claim 1, wherein a missing disk output signal and an error signal error are detected .

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