JP2003085894A - Data detecting method and data detecting circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data detecting circuit, which has no erroneous detection caused by a flaw on the surface of a disk or off-track signal caused by sprious and can accurately detect a track jump. SOLUTION: This circuit is provided with a coincidence detecting means for detecting continuity of data on the basis of a peculiar value, that time sequentially inputted data have, a counter for presetting a count value to the peculiar value of the input data at that time when continuity of the data is detected by the coincidence detecting means and outputting a value, with which that count value is increased just by '1', when discontinuity of the data is detected, a comparing means for comparing the peculiar value of the input data with the output value of the counter, and a deciding means for deciding continuity of the data based on the detected result of the coincidence detecting means and the compared result of the comparing means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data detecting method and a data detecting circuit, and more particularly, to a data detecting method for improving reliability when detecting continuity of input data recorded on a recording medium or the like, and The present invention relates to a data detection circuit.

[0002]

2. Description of the Related Art A conventional method for detecting a track jump of an optical disk will be described with reference to FIG. FIG. 4 is a diagram showing the configuration of a conventional track jump detection circuit for an optical disk. In a conventional method of detecting a track jump of an optical disc, as shown in FIG. 4, an RF signal read from an optical disc 40 via a pickup 41
The off-track signal shown in FIG. 5 is generated by processing in the signal processing circuit 42 composed of a low-pass filter or the like, and this off-track signal is added to the track jump detection circuit 43 to detect the track jump. . However, when a scratch or a pseudo off-track signal as shown in FIG. 6 is generated, discontinuity is detected even if the data is continuous, and a track jump may be detected.

[0003]

The conventional data detection method and data detection circuit are configured as described above, and even though the data is actually continuous, the recording medium is scratched or simulated. Due to this, there is a problem that a track jump may be detected.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a data detection method and a data detection circuit capable of detecting data discontinuity with high accuracy. To do.

[0005]

In order to solve the above-mentioned problems, a data detection circuit according to a first aspect of the present invention detects data continuity based on eigenvalues of data input in time series. When the continuity of the data is detected by the coincidence detection means and the coincidence detection means, the count value is preset to the unique value of the input data at that time, and when the discontinuity of the data is detected. Is
A counter for outputting a value obtained by incrementing the count value by 1, a comparing means for comparing the eigenvalue of the input data with the output value of the counter, and the coincidence detecting means for detecting data discontinuity, Moreover, when the comparing means detects a disagreement, it is provided with a judging means for judging that the input data has discontinuity.

A data detecting circuit according to claim 2 of the present invention is the data detecting circuit according to claim 1, wherein
When the determination means detects a match, the input data is determined to have continuity.

According to a third aspect of the present invention, in the data detection circuit according to the first or second aspect, the coincidence detecting means inputs the eigenvalue of the input data before that. The continuity of the data is determined by comparing it with the eigenvalue of the data.

A data detection circuit according to a fourth aspect of the present invention is the data detection circuit according to the first or second aspect, wherein the coincidence detection means has a specific pattern included in the data input in time series. And the continuity of data is compared with a preset specific pattern.

Further, a data detecting method according to a fifth aspect of the present invention comprises a coincidence detecting step of detecting continuity of data based on an eigenvalue of data inputted in time series, and the coincidence detecting step. When the continuity of the data is detected, the count value is preset to the eigenvalue of the input data at that time, and when the discontinuity of the data is detected, the count value is increased by 1. A count value output step, a comparison step of comparing the eigenvalue of the input data with the output value of the count value output step, a discontinuity is detected in the match detection step, and a mismatch is detected in the comparison step. Is detected, the determination step of determining that the data has discontinuity is included.

A data detecting method according to claim 6 of the present invention is the data detecting method according to claim 5,
The determination step determines that the data has continuity when a match is detected in the comparison step.

According to a seventh aspect of the present invention, in the data detecting method according to the fifth or sixth aspect, the coincidence detecting step inputs the eigenvalue of the input data before that. The continuity of the data is determined by comparing it with the eigenvalue of the data.

The data detecting method according to claim 8 of the present invention is the data detecting method according to claim 5 or 6, wherein the coincidence detecting step has a specific pattern included in the data input in time series. And the continuity of data is compared with a preset specific pattern.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A data detection method and a data detection circuit according to a first embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Figure 1
FIG. 6 is a diagram showing a flowchart for detecting data continuity in the data detection method according to the first embodiment.

FIG. 2 is a diagram showing the structure of a data detection circuit for realizing the above data detection method. In the figure, 1 is a predetermined value added to a plurality of data having continuous IDs. It is a coincidence detection circuit that compares items with each other and detects the continuity of input data. 2 is a counter,
In addition to counting the number of input data, when the coincidence detecting means detects the continuity of the data, the count value is preset to the ID of the input data and output as an output value. When the discontinuity of the data is detected, a value obtained by incrementing the count value by 1 is output as an output value. Reference numeral 3 is a comparison circuit for comparing the ID of the input data with the output value of the counter.

Next, the operation will be described with reference to FIGS. 1 and 2. Specific ID for the data detection circuit according to the present invention
When the data with the
Of the (n + 2) th data input, and (n +
A match is detected between the ID of the 1st input data and "1" added to the ID of the nth input data, and the addition of "2" to the ID of the nth input data (step S10).
1).

At this time, if the detection results match, the match detection circuit 1 outputs a flag "1" indicating that the data is continuous, and the process proceeds to step S102. On the other hand,
If the detection result of the coincidence detection circuit 1 does not coincide, the coincidence detection circuit 1 outputs a flag "0" indicating that the data is discontinuous, and the process proceeds to step S103.

When the counter 2 receives the flag "1" indicating that the detection result is continuous data from the coincidence detection circuit 1, the counter 2 presets the value of the counter 2 to the (n + 2) th ID and outputs it. (Step S102). On the other hand, when the counter 2 receives the flag “0” indicating that the detection result is discontinuous data from the coincidence detection circuit 1,
The value of the counter 2 is incremented by 1 and output.

Thereafter, the ID value of the (n + 2) th input data and the value output by the counter 2 are input to the comparison circuit 3, and the comparison circuit outputs the (n + 2) th input data. The ID value and the output value of the counter 2 are compared (steps S104 and S105).

At this time, if the comparison results by the comparison circuit 3 match, the comparison circuit 3 outputs the flag "1", and if they do not match, the comparison circuit 3 outputs the flag "0".

After that, the OR circuit takes the OR of the outputs of the coincidence detection circuit 1 and the comparison circuit 3, and when the flag "1" is output from the OR circuit, the continuity of the data is detected, When the flag "0" is detected, discontinuity is detected.

That is, the discontinuity is detected (step S106) only when the disagreement is detected in the detection result of the coincidence detection circuit 1 and the disagreement is detected in the detection result of the comparison circuit 3 (step S106). When a match is detected by either the detection circuit 1 or the comparison circuit 3 (steps S107 and S109), or when a match is detected by both the match detection circuit 1 and the comparison circuit 3 (step S1)
In 08), continuity is detected.

As described above, according to the first embodiment, the coincidence detection circuit 1 is used to detect the coincidence of whether or not the data has continuity, and the discrepancy (data discontinuity) is detected here. Even if the possibility of a track jump is detected, the comparison circuit 3 compares the value obtained by incrementing the count value of the counter 2 by 1 with the input ID, and when both match, the recording medium Since it is assumed that an incorrect ID generated due to a scratch or the like has been input and a determination result that the data is continuous is output, the input data has a continuity loss due to a track jump. In some cases, this can be reliably detected.

(Second Embodiment) Next, a data detection method and a data detection circuit according to a second embodiment of the present invention will be described with reference to FIG. In FIG. 3, the same reference numerals as those in FIG. 2 indicate the same or corresponding portions, and 4 is a pattern matching detection circuit in which data having a certain pattern is input and compared with a preset pattern. Here, the fixed pattern is data in units of sectors on the optical disc, such as a synchronization pattern,
It consists of data, ....

The operation will be described below. First, the pattern matching detection circuit 4 detects whether or not the input constant pattern matches the preset pattern. If the matching results match, the pattern matching detection circuit 4 outputs a flag "1" indicating the matching, and the counter 2
Resets the counter value to the data ID and outputs it. On the other hand, if the matching result of the match detection circuit 4 does not match, the pattern match detection circuit 4 outputs a flag “0” indicating the mismatch, and at this time, the counter 2 increments the count value by 1 and outputs it.

After that, similarly to the data detecting method and the data detecting device according to the first embodiment, the (n + 2) th ID value input in the comparing circuit 3 and the counter 2 are detected.
Of the flags output from the pattern matching detection circuit 4 and the comparison circuit 3 to detect the continuity of the input data.

As described above, according to the second embodiment, the data of the predetermined pattern externally input by the coincidence detection circuit 4 and the data of the predetermined pattern preset in the coincidence detection circuit 4 are compared and collated. When the comparison result does not match, the value of the counter 2 is incremented by 1 and output, and the comparison circuit 3 compares the output value of the counter 2 with the input ID. Outputs the determination result that the data is continuous, so that when the input data is the one whose continuity is lost due to the track jump, this can be reliably detected. Therefore, even if an erroneous ID generated due to a scratch on the recording medium is input, an erroneous determination is not made, and it is possible to reliably determine data whose continuity is lost due to a track jump.

[0027]

As described above, according to the present invention, the coincidence detecting means for detecting the continuity of the data based on the eigenvalues of the input data, and the coincidence detecting means for confirming the continuity of the data. When detected, the count value is preset to the eigenvalue of the data input at that time and output, and when the discontinuity of the data is detected, the count value increased by 1 is output. A counter,
A structure for comparing the eigenvalue of the input data with the output value of the counter, and detecting the continuity of the data based on the detection result of the coincidence detection means and the comparison result of the comparison means. Therefore, even if an erroneous ID generated due to a scratch on the recording medium or the like is input, an erroneous determination is not made, and it is possible to reliably determine data whose continuity is lost due to a track jump. is there.

[Brief description of drawings]

FIG. 1 is a flowchart for explaining a data detection method according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a data detection circuit according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of a data detection circuit according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventional track jump detection circuit.

FIG. 5 is a diagram for explaining a correct off-track signal.

FIG. 6 is a diagram for explaining an erroneous off-track signal due to a scratch.

[Explanation of symbols] 1 Match detection circuit 2 counter 3 comparison circuit 4 pattern match detection circuit 40 optical disc 41 pickup 42 signal processing circuit 43 Track jump detection circuit

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Claims (8)

[Claims] 1. A coincidence detecting means for detecting continuity of data based on an eigenvalue of data inputted in time series, and a case where continuity of the data is detected by the coincidence detecting means. The count value is preset to the unique value of the input data at that time, and when a discontinuity of the data is detected, a counter that outputs a value obtained by incrementing the count value by 1, a unique value of the input data, When the comparing means for comparing the output value of the counter and the coincidence detecting means detect the discontinuity of the data and the comparing means detects the discontinuity, it is determined that the input data has the discontinuity. A data detection circuit comprising: a determination unit. 2. The data detection circuit according to claim 1, wherein the determination means determines that the input data has continuity when the comparison means detects a match. circuit. 3. The data detection circuit according to claim 1 or 2, wherein the coincidence detection means compares the eigenvalue of the input data with the eigenvalue of the data previously input, thereby continuing the data. A data detection circuit characterized by performing sex determination. 4. The data detection circuit according to claim 1 or 2, wherein the coincidence detection means compares a specific pattern of data input in time series with a preset specific pattern. A data detection circuit, which determines the continuity of data. 5. A coincidence detecting step of detecting continuity of data based on an eigenvalue of data inputted in time series, and a continuity detecting step of detecting the continuity of the data when the continuity detecting step detects the continuity of the data. The count value is preset to the unique value of the input data at that time, and when a discontinuity of the data is detected, a count value output step of outputting a value obtained by incrementing the count value by 1 and When the discontinuity is detected in the comparison step, which compares the eigenvalue and the output value of the count value output step, and the disagreement is detected in the comparison step, the data has discontinuity. And a determination step of determining that the data detection method is a data detection method. 6. The data detection method according to claim 5, wherein the determination step determines that the data has continuity when a match is detected in the comparison step. 7. The data detection method according to claim 5 or 6, wherein the coincidence detection step compares the eigenvalue of the input data with the eigenvalue of the data input before that, thereby continuing the data. A data detection method characterized by determining sex. 8. The data detection method according to claim 5 or 6, wherein the coincidence detection step is performed by comparing a specific pattern included in the time-series input data with a preset specific pattern. And a method for detecting data, wherein the continuity of data is determined.