JP2002312129A - Device and method for evaluating quality of regenerated signal, device and method for regenerating data, and recording data and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain accurate evaluation values by measuring regenerated signal quality evaluation value, only in regions which have no defects. SOLUTION: The number of times for detecting the regenerated signal quality evaluation values is counted by a counter 107 and is integrated by a register 103 for each small interval shorter than a processing unit of a CPU for controlling a device. When a defect is detected on a disk, a defect detection signal is extended between the small interval detecting the defect and the next small interval by registers 113 and 114. The values integrated in the register 103 are written in a register 104 for each small interval. The values in the register 104 are integrated in a predetermined number of times in a register 106 by the extended defect detecting signal. This value is used as a final averaged evaluation value. Since the integrated value for the small interval detecting the defect and a small interval immediately, before the small interval is made invalid by the extended defect detecting signal, the averaged evaluation value can be obtained, without being influenced by the defect on the disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproduction signal quality evaluation apparatus and method, and a data reproduction apparatus and method for appropriately evaluating a reproduction signal when reproducing data from a recording medium such as an optical disk or a magnetic disk. And a data recording device and method.

[0002]

2. Description of the Related Art To achieve high-density recording in a practical sense in a data storage device using an optical disk, a magnetic disk, and a magneto-optical disk as a recording medium,
It is necessary that a certain margin is secured for factors such as device manufacturing variations, aging, and recording medium variations.

In a reproduction system, if the apparatus itself has means for detecting a quality evaluation value of a reproduction signal in real time, the reproduction condition is automatically adjusted based on the evaluation value, and the above-mentioned margin is substantially increased. It becomes possible. Similarly, in a recordable apparatus, the optimum recording condition can be set by changing the recording condition and measuring the evaluation value of the reproduction signal corresponding to each recording condition.

A representative example of such a signal quality evaluation value is, for example, jitter. Further, the inventor of the present invention sets the signal quality evaluation value to SAM (Sequenc
ed Amplitude Margin), and a method of calculating in real time has been already filed (Japanese Patent Application No. 2000-3825).
95).

In any case, these evaluation methods detect a kind of noise component, and perform statistical processing on a large number of samples to obtain an averaged evaluation value. When such an average value is used, it is assumed that the recording medium can be regarded as uniform in the range where the average value is obtained, even if the evaluation value varies for each sample.

However, in an actual recording medium, there are usually some parts (hereinafter referred to as defects) that cannot be recorded / reproduced normally due to scratches or dust during production and use. Therefore, it is important to separate the signal obtained by reproducing the defective portion from the signal obtained by reproducing the normal portion and obtain the signal quality evaluation value only from the normal reproduced signal in order to obtain an accurate value. As a method of detecting the defect, for example, a method of detecting a sharp phenomenon of the amplitude of the reproduction signal and an unlock of the data detection timing generation PLL can be considered.

FIG. 3 shows an example of a conventional technique for obtaining an averaged evaluation value excluding a reproduction signal evaluation value when a defect is detected. The reproduced signal quality evaluation value input to this circuit is a value for each sample generated in the previous stage. For example, when finally determining jitter as a signal evaluation value, the output from the phase comparator of the PLL circuit described above is output. Is the value of the square of the calculated phase error. The strobe signal is paired with the reproduction signal quality evaluation value, and is a signal that becomes H (High) level for one clock when the reproduction signal quality evaluation value is newly detected. The measurement start signal is generated for at least one clock when the measurement of the reproduction signal quality evaluation value starts.
This is a signal that goes high.

Hereinafter, the operation from the start to the end of the measurement will be described. First, when the measurement is started and the measurement start signal is set to the H level, the register 201 and the counter 202 are reset to 0.
Reset. Thereafter, when the reproduced signal quality evaluation value is detected and the strobe signal becomes H level, the value stored in the register 201 and the input reproduced signal quality evaluation value are added by the adder 200 and supplied to the register 201. Thereby, the value stored in the register 201 is updated to a value obtained by integrating the reproduction signal quality evaluation value. Register 20
By 1, the value obtained by integrating the reproduction signal quality evaluation value for each sample is held.

At the same time, the counter 202 counts the number of times the value of the register 201 has been updated. That is, the strobe signal is supplied to the non-inverting input terminal of the AND circuit 203, and the defect detection signal and the comparator 20
5 is supplied to the inverting input of the AND circuit 203.
The output of the AND circuit 204 is supplied to the enable terminal of the counter 202. In the counter 202, this AN
The number of times that the output of the D circuit 203 has become H level is counted.

While the defect is detected and the defect detection signal is at the H level, the output of the AND circuit 203 is at the L (Low) level, and the updating of the counter 202 and the updating of the register 201 are inhibited. Is done.

A count value of the counter 202 and a constant 204 set to a predetermined value are supplied to a comparator 205, respectively. The comparator 205 compares these values,
When the count value of the counter 202 reaches the value set as the constant 204, the output signal of the comparator 205 goes high.

The output of the comparator 205 is connected to the above-described AN.
The signal is supplied to the D circuit 203 and to the register 206 as an enable signal. When the output of the comparator 205 becomes H level, the updating of the register 201 and the updating of the counter 202 are prohibited as described above, and the output of the adder 200 is supplied to the register 206, and the averaged evaluation value is stored in the register 206. Loaded. The output of the comparator 205 is also used as a measurement end signal indicating that the measurement has ended.

Here, the reproduction signal quality evaluation value is:
Considered as a relative evaluation index, it does not make a clear distinction between the integrated value (total value) and the average value. If a value having a defined unit is required as the evaluation value, the output of the register 206 may be multiplied by a predetermined count in consideration of the number of integrated samples.

[0014]

In the configuration according to the prior art, as described above, the integration of the reproduction signal quality evaluation value is prohibited while a defect is detected. However, actually, the delay of the defect detection signal with respect to the position of the defect is unavoidable, and during this delay, a value that should not be integrated is accumulated in the register 201. as a result,
There is a problem that an error in the averaged reproduced signal quality evaluation value increases.

Accordingly, an object of the present invention is to provide a reproduction signal quality evaluation apparatus and method capable of measuring a reproduction signal quality evaluation value only in an area having no defect and obtaining an accurate evaluation value, and a data reproduction method. It is to provide an apparatus and a method.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a reproduction signal quality evaluation apparatus for evaluating a reproduction signal when reproducing data from a disk recording medium. A first integration means for integrating a reproduction signal quality evaluation value for evaluating the quality of a reproduction signal whose data is reproduced from each of the small sections, and a small section when a defect of the disk-shaped recording medium is detected. There is an exclusion means for excluding a small section immediately before the small section, and a second integration means for integrating the integrated value of the small sections other than the small section excluded by the exclusion means, integrated by the first integration means. And
A reproduction signal quality evaluation apparatus characterized in that an averaged evaluation value is obtained using an integrated value integrated by a second integration means.

The present invention also relates to a reproduction signal quality evaluation method for evaluating a reproduction signal when reproducing data from a disk-shaped recording medium, wherein the quality of the reproduction signal obtained by reproducing data from the disk-shaped recording medium is evaluated. A first integration step of integrating the reproduction signal quality evaluation value for each small section for the small section, and excluding a small section when a defect of the disk-shaped recording medium is detected and a small section immediately before the small section. And a second integration step of integrating the integrated values of small sections other than the small section excluded by the exclusion step, integrated by the first integration step, the second integration step A reproduced signal quality evaluation method characterized in that an averaged evaluation value is obtained using the integrated value integrated by the above.

Further, the present invention provides a data reproducing apparatus for reproducing data from a disk-shaped recording medium, wherein the reproducing means reproduces data from the disk-shaped recording medium and the quality of a reproduced signal reproduced by the reproducing means is evaluated. First integration means for integrating the reproduction signal quality evaluation value of each of the small sections for each small section, and exclusion means for excluding the small section when a defect of the disk-shaped recording medium is detected and the small section immediately before the small section, First
And a second integrating means for integrating the integrated values of the small sections other than the small section excluded by the removing means, integrated by the integrating means of (a), and using the integrated value integrated by the second integrating means. A data reproducing apparatus characterized in that an averaged evaluation value is obtained, and the reproducing means is adjusted using the averaged evaluation value.

The present invention also relates to a data reproducing method for reproducing data from a disk-shaped recording medium, wherein a reproducing step of reproducing data from the disk-shaped recording medium by reproducing means, and a reproducing signal of the reproduced signal reproduced by the reproducing step. A first integration step of integrating a reproduction signal quality evaluation value for evaluating quality for each small section, and a small section when a defect of the disk-shaped recording medium is detected and a small section immediately before the small section. An exclusion step for exclusion, and a second integration step for integrating the integrated values of small sections other than the small section excluded by the exclusion step, integrated by the first integration step, A data reproducing method characterized in that an averaged evaluation value is obtained by using the integrated value integrated in the step of integrating, and the reproducing means is adjusted using the averaged evaluation value. A.

According to the present invention, there is provided a data recording apparatus for recording data on a disk-shaped recording medium, comprising: a recording unit for recording data on the disk-shaped recording medium; Reproducing means for reproducing the recorded data; first integrating means for integrating a reproduced signal quality evaluation value for evaluating the quality of the reproduced signal reproduced by the reproducing means for each small section; and a disk-shaped recording medium Exclusion means for excluding a small section when a defect is detected and a small section immediately before the small section, and an integrated value of small sections other than the small section excluded by the exclusion means, integrated by the first integration means And a second integrating means for integrating the average value, obtaining an averaged evaluation value using the integrated value integrated by the second integrating means, and adjusting the recording means using the averaged evaluation value. Specially A data recording device to.

According to the present invention, in a data recording method for recording data on a disk-shaped recording medium by a recording means, a recording step of recording data on the disk-shaped recording medium, and a step of recording the data immediately after being recorded in the recording step. A reproduction step of reproducing data recorded from the disk-shaped recording medium, and a first integration of integrating a reproduction signal quality evaluation value for evaluating the quality of the reproduction signal reproduced in the reproduction step for each small section. Step, an exclusion step of excluding a small section when a defect of the disk-shaped recording medium is detected and a small section immediately before the small section, and an exclusion step integrated by the first integration step. And a second integration step of integrating the integrated values of the small sections other than the small section, and averaging the integrated values obtained in the second integration step. Give the evaluation value, a data recording method is characterized in that to perform the adjustment of the recording means by using the averaged evaluation value.

As described above, according to the first and second aspects of the present invention, a reproduction signal quality evaluation value for evaluating the quality of a reproduction signal obtained by reproducing data from a disk-shaped recording medium is integrated for each small section. Averaging evaluation value is calculated using the integrated value obtained by integrating the integrated values of the small sections of the integrated small sections, excluding the small section when the defect of the disk recording medium is detected and the small section immediately before the small section. Therefore, the averaged evaluation value can be obtained without being affected by the defect on the disk-shaped recording medium.

According to a third aspect of the present invention, a reproduction signal quality evaluation value for evaluating the quality of a reproduction signal for data reproduced from a disk-shaped recording medium by a reproducing means is provided for each small section. Averaging is performed using the integrated value obtained by integrating the integrated values of the small sections obtained by adding up the small section when the defect of the disk recording medium is detected and the small section immediately before the small section among the added small sections. Since the evaluation value is obtained and the reproducing means is adjusted using the averaged evaluation value, the reproducing means can be adjusted without being affected by a defect on the disk-shaped recording medium.

According to the fifth and sixth aspects of the present invention, the data recorded on the disk-shaped recording medium by the recording means is reproduced immediately after recording the data recorded on the disk-shaped recording medium by the recording means. , For the reproduced data,
The reproduction signal quality evaluation value for evaluating the quality of the reproduction signal is integrated for each small section, and, among the integrated small sections, the small section when the defect of the disk recording medium is detected and the small section immediately before the small section. An averaged evaluation value is obtained using the integrated value obtained by integrating the integrated values of the small sections excluding the section, and the recording means is adjusted using the averaged evaluation value. The recording means can be adjusted without being affected by the above.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below. According to the present invention, integration of a reproduction signal quality evaluation value based on a signal reproduced from a recording medium such as an optical disk or a magnetic disk is performed by dividing the evaluation value into small sections corresponding to a delay of a defect detection signal. Then, when a defect is detected in the small section, the integrated value in the small section and the small section immediately before the small section are invalidated. As a result, the measurement of the reproduction signal quality evaluation value can be performed only in the defect-free area of the recording medium, and an accurate evaluation value can be obtained.

The small section is, for example, a period shorter than a processing unit of a CPU (Central Processing Unit) for controlling the apparatus, for example, several tens to several hundreds of microseconds.

As the reproduction signal quality evaluation value, for example, jitter can be used. The jitter is a fluctuation of a difference between a time at which the reproduced signal crosses a threshold serving as a reference for binarizing the reproduced signal and a time at which the reproduced signal is discriminated into binary, and is usually represented by a standard deviation.

Further, SAM (S
equenced Amplitude Margin) can also be used. The SAM is a noise margin allowed until the maximum likelihood decoder outputs an erroneous binary data sequence.
In practice, a completely correct 2
Since it is difficult to obtain a coded data sequence with a small delay time, in practice, the degree of certainty (path metric Mr) of the data sequence determined by the maximum likelihood decoder to be most likely and the path metric Mr The difference (Mr-Mw) from the degree of certainty (path metric Mw) of the data sequence determined to be the error closest to (Mr) is taken as the SAM value.

FIG. 1 shows an example of the configuration of a reproduction signal quality evaluation circuit 100 according to the first embodiment of the present invention. Of the signals input to the reproduction signal quality evaluation circuit 100, the reproduction signal quality evaluation value is a value for each sample generated in the previous stage. For example, when jitter is used as the reproduction signal quality evaluation value, Are output when the reproduction signal has passed the 0 level. The strobe signal is paired with the reproduction signal quality evaluation value, and is a signal that becomes H (High) level for one clock when the reproduction signal quality evaluation value is newly detected. For example, one small section is formed by 256 pulses of the strobe signal.

The measurement start signal is a signal that goes high for at least one clock at the start of the measurement of the reproduction signal quality evaluation value. The defect detection signal is, for example, a signal that is set to the H level when a defect is detected in the recording medium.

In the configuration shown in FIG.
D circuit 116, counter 117, constant 118, comparator 1
19 and register 120 (and adder 105)
Is equivalent to the configuration of FIG. 3 according to the conventional example described above. However, the output of the counter 117 compared with the constant 118 by the comparator 119, that is, the register 10
The number of integrations before the integration in step 6 is completed is not the number of samples of the reproduced signal quality evaluation value that is averaged as in the above-described conventional example, but this value is divided by the number of samples integrated in the above-described small section. Value. That is, the counter 117 counts the number of measured small sections.

In FIG. 1, a reproduced signal quality evaluation value is supplied to one input terminal of an adder 101 and to a terminal 102b of a switch circuit 102. Adder 101
Is supplied to the terminal 101a of the switch circuit 102. The switch circuit 102 selects the terminal 102b when the control signal is at the H (High) level, and selects the terminal 102 in other states.
a is selected. The output of the switch circuit 102 is supplied to a register 103.

Data can be written to the register 103 when the signal supplied to the enable terminal is at H level. The output of the register 103 is supplied to the other input terminal of the adder 101. The output of the register 103 is also supplied to the register 104. Data can be written to the register 104 when the signal supplied to the enable terminal is at the H level. The output of the register 104 is the adder 1
05 is supplied to one input terminal.

The output of the adder 105 is supplied to a register 106. The register 106 stores 0 at the measurement start signal.
At the same time as resetting, data can be written when the signal supplied to the enable terminal is at the H level. The output of the register 106 is supplied to the other input terminal of the adder 105, the output of the register 104 is integrated, and the content of the register 106 is updated.

The output of the adder 105 is stored in the register 1
20 is also supplied. Data can be written to the register 120 when the signal supplied to the enable terminal is at the H level. The output of the register 120 is extracted as a final averaged evaluation value.

The counter 107 is set to 0 by the measurement start signal.
The number of times that the strobe signal is reset and the strobe signal input to the enable terminal becomes H level is counted. When the count value exceeds a predetermined value, the count value is reset and the counting is continued again. In this example, when the strobe signal (256 pulses) of one small section is counted, the counter value is reset. The count value counted by the counter 107 is supplied to the comparator 109. The comparator 109 compares the count value of the counter 107 with a constant 108 having a value of 0, and outputs an H-level output signal when they match.

The output of the comparator 109 is output from the switch circuit 10
2 is supplied to the switch circuit 102 as a control signal for switching the terminals 102a and 102b. Also,
The output of the comparator 109 is supplied to one input terminal of the AND circuit 110. A strobe signal is supplied to the other input terminal of the AND circuit 110. The output of the AND circuit 110 is supplied to a register 104 and a register 114 described later.
Of the AND circuit 11
6 is supplied to the non-inverting input terminal.

Further, the output of the AND circuit 110 is
The signal is supplied to the inverting input of the D circuit 111 and to the enable terminal of the register 114. Register 114
Is forcibly set to the H level by the measurement start signal. The output of the register 114 is supplied to one input terminal of the OR circuit 115.

A defect detection signal is supplied to one input terminal of the OR circuit 112. The output of the OR circuit 112 is supplied to the register 113. The register 113 is reset to 0 by the measurement start signal. The output of the register 113 is connected to the other input terminal of the OR circuit 115 and the AND circuit 1.
11 is supplied to the non-inverting input terminal of the
4 is supplied. The outputs of the registers 113 and 114 are supplied to one and the other input terminals of the OR circuit 115, respectively, and the output of the OR circuit 115 is supplied to the inverting input of the AND circuit 116 as described above.

Next, the operation of the configuration shown in FIG. 1 will be described. First, the register 106, the counter 107 count 117 and the register 113 are reset to 0 by the measurement start signal, and the register 114 is forcibly set to H.
Level.

When the evaluation value is detected, the strobe signal is set to the H level, and the counter 107 sets the strobe signal to the H level.
The level is counted. The counted value is compared with the constant 108 by the comparator 109, and the terminal 102a is selected by the switch circuit 102 based on the comparison result. The reproduction signal quality evaluation value is calculated by the adder 101 and the switch circuit 102.
Is supplied to the register 103 via the. The reproduction signal quality evaluation value is accumulated in the register 103 every time a new reproduction signal quality evaluation value is supplied.

In the counter 107, the strobe signal H
A predetermined number of levels defined in a small section (256 in this example)
Times), the count value is reset to 0 after counting. Then, the comparison result of the comparator 109 becomes H level. When the H level of the comparison result is supplied together with the H level of the strobe signal at this time, the output of the AND circuit 110 is set to the H level. Thereby, the register 1
03 is written into the register 104. That is, the integrated value of the reproduction signal quality evaluation value in a small section is written in the register 104.

On the other hand, H output from AND circuit 110
The level signal is supplied to the inverted input of the AND circuit 111 and the enable terminal of the register 114. When the value of the register 113 is at the H level,
In addition, when the output of the AND circuit 110 is not at the H level, the output goes to the H level. Also, the OR circuit 112
If the output of the D circuit 111 is at the H level, or if a defect is detected in the recording medium and the defect detection signal goes to the H level, the output goes to the H level. This output of the OR circuit 112 is written to the register 113. Therefore, in the register 113, when a defect is detected in the recording medium and H
A level defect detection signal is supplied, and this H level is written. The written value is held in the small section to which the H-level defect detection signal is supplied.

As described above, the register 114
Are forcibly set to the H level by the measurement start signal. There, the value of the register 113 is written by the H level signal from the AND circuit 110. The written value is held until the H-level signal is supplied from the AND circuit 110 next time. Therefore, register 1
At 14, the value before the start of the measurement is discarded, and the H from the small section to which the defect detection signal is supplied to the next small section.
Level.

Outputs of the registers 113 and 114 are supplied to an OR circuit 115, respectively. That is, the output of the OR circuit 115 is at the H level in two sections, the small section in which the defect is detected and the next small section. That is, the defect detection signal is extended by the registers 113 and 114 until the integration of the small section in which the reproduction signal quality evaluation value is currently integrated and the integration of the next small section are completed.

When the comparison result of the comparator 109 becomes H level, the switch circuit 102 selects the terminal 102b. As a result, the reproduction signal quality evaluation value to be supplied next is directly written into the register 103, and the value integrated in the register 103 is initialized.

As described above, the following configuration, that is,
Register 106, AND circuit 116, counter 117,
A portion including the constant 118, the comparator 119, and the register 120 (and the adder 105) is equivalent to the configuration of the above-described conventional example shown in FIG. 3, and the operation thereof is similar to that.

The non-inverting input of the AND circuit 116 includes AN
The output of the D circuit 110 is supplied, and two inverting inputs are:
The outputs of the OR circuit 115 and the comparator 119 are supplied. The output of the AND circuit 116 is a counter 117
And an enable terminal of the register 106.

On the other hand, in the counter 117, the AND circuit 1
The number of times that the outputs of H. 16 have become H level is counted. The count value of the counter 117 is supplied to a comparator 119, and is compared with a constant 118 set to a predetermined value. If they match, an H level signal is output. Constant 11
Numeral 8 is a value that specifies how many small sections are to be used to output the averaged evaluation value.

That is, the output of the AND circuit 116 is set to the H level for each of the subsections other than the section to which the defect detection signal is supplied and the next subsection, and when the number of H levels reaches the predetermined number. It becomes L level.

On the other hand, in the register 106, the AND circuit 1
When the output of the register 16 is at the H level, the value of the register 104 is integrated. That is, the output of the register 106 is supplied to the adder 105, and the output of the register 104 and the register 1
The output of the register 106 is added to the output of the register 106 and written into the register 106, and the content of the register 106 is updated.

As described above, when the count value of the counter 117 reaches the value set by the constant 118, the comparator 1
The output signal of H level outputted from the AND circuit 19 is
16 inverting inputs. AND circuit 1 at that time
Based on the output of the counter 16, counting of the counter 117 and updating of the register 106 are prohibited. At the same time, the comparator 1
The 19 output signal is supplied to the enable terminal of the register 120, and the output of the adder 105 is written to the register 120. The value written to this register 120 is used as the final averaged evaluation value. It is assumed that the output of the comparator 119 is at the H level and the measurement has been completed.

As described above, in the first embodiment,
Based on the output of the AND circuit 116, the value of the register 104 is integrated with the value of the register 104. As described above, in the register 104, the integrated value of the reproduction signal quality evaluation value per small section is delayed by one small section. Also, A
The output of the OR circuit 115 is supplied to one of the inverting inputs of the ND circuit 116, and the integration of the output of the register 104 in the register 106 is prohibited in the small section in which the defect is detected and the next small section.

For this reason, the register 106 prohibits the integration from the integrated value of the small section currently being integrated and the small section immediately before. Therefore, even if there is a delay in the defect detection signal with respect to the actual defect of the recording medium, the reproduction signal quality evaluation value in the section where the delay has occurred is not finally integrated.

Next, a second embodiment of the present invention will be described. The second embodiment is an example in which the reproduction signal quality evaluation circuit 100 according to the first embodiment is applied to a recording / reproducing apparatus. FIG. 2 shows a configuration of an example of a recording / reproducing apparatus according to the second embodiment. The recording / reproducing apparatus includes an encoder 51 for encoding data, a magnetic head 8 for applying a magnetic field to a signal recording surface of the magneto-optical disk 9, and a magnetic field modulated on the magnetic head 8 based on data 24 from the encoder 51. And a magnetic field modulation driver 6 that generates

It is assumed that the RF signal is decoded into binary data by Viterbi decoding in the configuration shown in FIG. 2, and the SAM value is used as the reproduced signal quality evaluation value.

The encoder 51 is used in an encoding process at the time of recording, and performs a predetermined process on data input from the outside. The data input unit 1 outputs data 21 from the data input unit 1 with an ID and an error search code (ID). error detecti
on code (EDC), an ECC encoding unit 2, an ECC encoding unit 3 for encoding an error correction code (ECC) into data from the ID and EDC encoding unit 2, and an ECC encoding unit 3.
And a modulator 5 for modulating the data 23 from the memory 4 in a predetermined manner.

Data 20 input from an external block (not shown) is input to the data input unit 1. Data 20 is
The data is output from the data input unit 1 as data 21,
D, sent to the EDC encoder 2. In the ID and EDC encoding unit 2, an ID to be recorded on the magneto-optical disk 9 and an EDC signal for checking a reproduction signal at the time of reproduction are added to the data 21.

The output of the ID and EDC encoder 2 is EC
The data is supplied to the C encoding unit 3, added with a parity for error correction, and output as data 22. The data 22 is temporarily stored in the memory 4, and the time lag of the data 22 transferred from the external block and processed as described above is absorbed. The signal 23 in which the data 22 has absorbed the time lag due to the processing is read from the memory 4 to the modulation unit 5.

The signal 23 is transmitted to the magneto-optical disk 9 by the modulation section 5.
Is modulated and output as a signal 24 to be recorded on the recording medium. For example, the modulation unit 5 modulates the signal 23 into a signal 24 using a modulation code having a minimum run of 1 or more. The signal 24 is sent to the magnetic field modulation driver 6. The magnetic field modulation driver 6 drives the magnetic field head 8 based on the signal 24 to generate a magnetic field sufficient for recording on the magneto-optical disk 9 and record data on the magneto-optical disk 9.

The recording / reproducing apparatus comprises a spindle motor 11 for rotatingly driving the magneto-optical disk 9 and an optical system for condensing and irradiating the signal recording surface of the magneto-optical disk 9 with laser light and receiving return light. 10, an RF amplifier 33 that amplifies an RF signal from the optical system 10, and a servo circuit 12 that servos the optical system 10 and the spindle motor 11 based on the signal from the RF amplifier 33.

The signal recorded on the magneto-optical disk 9 is read out by the optical system 10,
It is supplied to the amplifier unit 33. In the RF amplifier section 33, based on the supplied reproduction signal 34, an RF signal 35, an ADIP (ADdress In Pre-groove) signal 36 of a wobbling address cut on the magneto-optical disk 9, a focus error, a tracking error, and the like. A servo error signal 37 is generated. These generated signals are respectively supplied to the servo circuit 12, the RF signal demodulator 13,
The signal is sent to the ADIP signal demodulation unit 38.

The servo circuit 12 controls the optical system 10 and the spindle motor 11 so that the reproduction signal 34 is in an appropriate state. The spindle motor 11 is controlled so that the disk 9 rotates at an appropriate rotation speed.

Further, this recording / reproducing apparatus has a decoder 52 for decoding the RF signal 35 output from the RF amplifier 33, and an ADIP signal 53 for processing the ADIP signal 36 output from the RF amplifier 33. are doing.

The decoder 52 is used for a decoding process at the time of reproduction. The decoder 52 demodulates the RF signal 35 amplified by the RF amplifier 33.
And I based on the data 25 from the RF signal demodulator 13
It has an ID decoding unit 14 for decoding D, and a memory 14 for storing data 26 from the RF signal demodulation unit 13 and data 27 from the ID decoding unit 14.

The RF signal 35 is demodulated in the RF signal demodulation unit 13 by a process reverse to that of the modulation unit 5. The signals 25 and 26 obtained by demodulating the RF signal 35 by the RF signal demodulation unit 13 are sent to the ID decoding unit 14 and the memory 15, respectively.

The ID decoder 14 detects the ID and the ID added by the EDC encoder 2 from the signal 25 output from the RF signal demodulator 13. I detected
D, the signal 2 output from the RF signal demodulation unit 13
The address 27 for storing 6 in the memory 15 is determined.

The decoder 52 further provides an EC for decoding the ECC from the data 28 read from the memory 15.
C decoding unit 16 and ECC decoding unit 16
The EDC decoding unit 17 decodes EDC from the data 29 decoded and output, and the data 30 decoded and output from the EDC from the EDC decoding unit 17.
And a data output unit 18 for performing predetermined processing on the data and outputting the data 31 to the outside.

The signal 26 output from the RF signal demodulation unit 13 and once stored in the memory 15 according to the address 27 is
The data 28 is read out to the ECC decoding unit 16. The data 28 is ECC decoded by the ECC decoding unit 16, subjected to error correction, and sent to the EDC decoding unit 1.
7 is supplied. The EDC decoding unit 17 checks whether the error-corrected data 29 is correct. The data 30 whose data 29 has been checked is sent to the data output unit 18 and transferred as output data 31 to an external block (not shown).

The ADIP signal section 53 is used at the time of recording and / or reproduction, and is used for the RF amplifier section 3.
An ADIP signal demodulation unit 38 for demodulating the ADIP signal output from the ADIP signal 3 and an ADIP signal demodulation unit 38
An ADIP decoding unit 39 for decoding the ADIP from the data 40 obtained by demodulating the signal.

By demodulating the ADIP signal with the ADIP signal demodulating section 38, data 40 composed of a data string cut on the disk is obtained. Further, the ADIP decoding unit 39 checks the data 40 for errors, so that the address information 41 can be obtained. This address information 41 is sent to the MCU unit 42 and used as a reference for recording and reproduction.

This recording / reproducing apparatus has a control section 19 for controlling each section, and an MCU section 42 for controlling the control section 19. The MCU unit 42 issues an instruction 32 to the control unit 19 based on the communication 43 with the external block.
Put out. The control unit 19 is configured as hardware, and sends a fine timing signal to each block based on control from the MCU unit 42.

An APC (Auto Power Control) circuit 5
0 is controlled based on an instruction from the control unit 19 to adjust the laser power by the optical system 10 and the recording power by the magnetic field modulation driver 6 (not shown).

In the recording / reproducing apparatus described above, the reproduced signal quality evaluation circuit 100 according to the first embodiment of the present invention.
Is applied to the RF signal demodulation unit 13, for example. That is, the RF signal demodulation unit 13 includes the Viterbi decoder, the SAM calculation unit, and the reproduced signal quality evaluation value 100. Also,
A defect on the magneto-optical disk 9 is detected by a defect detection unit (not shown), and a defect detection signal indicating the detection result is input to the RF signal demodulation unit 13 and supplied to the reproduction signal quality evaluation circuit 100. The measurement start signal is output, for example, from the control unit 19 in a predetermined manner and supplied to the reproduction signal quality evaluation circuit 100.

A reproduction signal 34 reproduced from the magneto-optical disk 9 by the optical system 10 is amplified in a predetermined manner by the RF amplifier 33, converted into an RF signal 35, and supplied to the RF signal demodulator 13. The RF signal 35 is decoded into binary data by a Viterbi decoder, and the decoded binary data string is stored in the memory 15, for example.

On the basis of the path metric difference and the binarized data obtained in the Viterbi decoder, a SAM value as a reproduction signal quality evaluation value is determined by a SAM calculation section and a strobe signal is output. The SAM value is supplied to the reproduction signal quality evaluation circuit 100, and the averaged evaluation value is obtained as described above. The averaged evaluation value is supplied to the control unit 19, for example. The control section 19 sends a control signal to the APC circuit 50 based on the supplied averaged evaluation value so that, for example, the laser power (reproduction power) of the optical system 10 is optimized.

This configuration can be applied not only when reproducing data from the magneto-optical disk 9 but also when recording data on the magneto-optical disk 9. At the time of recording, immediately after recording on the magneto-optical disk 9 by the magnetic field head 8, the recording signal is reproduced by the optical system 10, and an averaged evaluation value is obtained as described above. By controlling, for example, the APC circuit 50 based on the averaged evaluation value, the recording power can be optimized, and the recording on the magneto-optical disk 9 can be appropriately controlled.

In the above description, the SAM value is used as the reproduction signal quality evaluation value. However, the present invention is not limited to this example. For example, the above-described jitter may be used as the reproduction signal quality evaluation value. Further, in the above description, the recording medium is described as a magneto-optical disk, but this is not limited to this example. For example, an optical disk or a magnetic disk may be used as the recording medium.

[0079]

As described above, according to the present invention, when the average value of the reproduction signal quality evaluation value based on the reproduction signal from a recording medium such as an optical disk, a magneto-optical disk, or a magnetic disk is obtained, the reproduction signal quality evaluation value is obtained. The integration of the value is divided into small sections corresponding to the delay of the defect detection signal, and when a defect is detected in the small section, the small section in which the defect is detected and the small section immediately before the small section are detected. Since the integrated value is invalidated, the effect of the defect of the recording medium itself is not affected.
There is an effect that the average value of the reproduction signal quality evaluation values can be accurately obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an example of a reproduction signal quality evaluation circuit according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of an example of a recording and reproducing device according to a second embodiment;

FIG. 3 is a block diagram showing an example of a configuration for obtaining an averaged evaluation value by excluding a reproduction signal evaluation value when a defect is detected according to the related art.

[Explanation of symbols]

6 ... magnetic field modulation driver, 9 ... magneto-optical disk,
10 ... optical system, 12 ... servo circuit, 13 ...
RF signal demodulation unit, 19 ... controller unit, 100
..Reproduction signal quality evaluation circuits, 103, 106, 113,
.. 114, 120... Registers, 107, 117.
Counter, 110, 111, 116... AND circuit

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G11B 20/18 520 G11B 20/18 520C 534 534A 550 550C 572 572B 572C 572D 572F 574 574A F term (reference) 5B065 BA EC03 5D044 AB01 BC01 BC02 CC04 DE61 FG10 FG16 FG18 GK12 GK18 GK19

Claims (12)

[Claims] 1. A reproduction signal quality evaluation device for evaluating a reproduction signal when reproducing data from a disk-shaped recording medium, comprising: a reproduction signal for evaluating the quality of a reproduction signal obtained by reproducing data from the disk-shaped recording medium. First integration means for integrating the quality evaluation value for each small section; exclusion means for excluding the small section when a defect of the disc-shaped recording medium is detected and the small section immediately before the small section; A second integrating means for integrating an integrated value of a small section other than the small section excluded by the excluding means, integrated by the first integrating means; and A reproduced signal quality evaluation device, wherein an averaged evaluation value is obtained by using the integrated value. 2. The reproduction signal quality evaluation device according to claim 1, wherein the reproduction signal quality evaluation value is a jitter. 3. The reproduction signal quality evaluation device according to claim 1, wherein the reproduction signal quality evaluation value is a SAM value. 4. A reproduction signal quality evaluation method for evaluating a reproduction signal when reproducing data from a disk-shaped recording medium, comprising: a reproduction signal for evaluating the quality of a reproduction signal obtained by reproducing data from the disk-shaped recording medium. A first integration step of integrating a quality evaluation value for each small section; and an exclusion step of excluding the small section and a small section immediately before the small section when a defect of the disk-shaped recording medium is detected. And a second integration step of integrating an integrated value of a small section other than the small section excluded in the exclusion step, integrated in the first integration step, A reproduction signal quality evaluation method, wherein an averaged evaluation value is obtained using an integrated value integrated in the integration step. 5. A data reproducing apparatus for reproducing data from a disk-shaped recording medium, comprising: reproducing means for reproducing data from the disk-shaped recording medium; and a reproduced signal for evaluating the quality of the reproduced signal reproduced by the reproducing means. First integration means for integrating the quality evaluation value for each small section; exclusion means for excluding the small section when a defect of the disc-shaped recording medium is detected and the small section immediately before the small section; A second integrating means for integrating an integrated value of a small section other than the small section excluded by the excluding means, integrated by the first integrating means; and A data reproducing apparatus characterized in that an averaged evaluation value is obtained using the integrated value obtained, and the reproducing means is adjusted using the averaged evaluation value. 6. The data reproducing apparatus according to claim 5, wherein the reproduced signal quality evaluation value is a jitter. 7. The data reproducing apparatus according to claim 5, wherein the reproduced signal quality evaluation value is a SAM value. 8. A data reproducing method for reproducing data from a disk-shaped recording medium, comprising: a reproducing step of reproducing data from the disk-shaped recording medium by reproducing means; and evaluating a quality of a reproduced signal reproduced by the reproducing step. A first integration step of integrating a reproduction signal quality evaluation value for each of the small sections for each of the small sections; and determining the small section when a defect of the disk-shaped recording medium is detected and the small section immediately before the small section An exclusion step for exclusion; and a second integration step for integrating the integrated value of the small sections other than the small section excluded in the exclusion step, integrated in the first integration step. It is characterized in that an averaged evaluation value is obtained using the integrated value integrated in the second integration step, and the reproduction means is adjusted using the averaged evaluation value. Data reproduction method to. 9. A data recording apparatus for recording data on a disk-shaped recording medium, comprising: recording means for recording data on the disk-shaped recording medium; and recording from the disk-shaped recording medium immediately after being recorded by the recording means. Reproduction means for reproducing the data, first accumulation means for integrating a reproduction signal quality evaluation value for evaluating the quality of the reproduction signal reproduced by the reproduction means for each small section, and the disc-shaped recording. Exclusion means for excluding the small section when a defect of the medium is detected and the small section immediately before the small section; A second integrating means for integrating the integrated value of the small section of the above, obtaining an averaged evaluation value using the integrated value integrated by the second integrating means, and using the averaged evaluation value to obtain the averaged evaluation value. Record A data recording device for adjusting recording means. 10. The data recording apparatus according to claim 9, wherein the reproduction signal quality evaluation value is a jitter. 11. The data recording apparatus according to claim 9, wherein the reproduction signal quality evaluation value is a SAM value. 12. A data recording method for recording data on a disk-shaped recording medium, comprising: a recording step of recording data on the disk-shaped recording medium by recording means; and the disk-shaped recording immediately after being recorded in the recording step. A reproduction step of reproducing the recorded data from a medium; and a first integration for integrating a reproduction signal quality evaluation value for evaluating the quality of the reproduction signal reproduced in the reproduction step for each small section. The step of excluding the small section when the defect of the disc-shaped recording medium is detected and the small section immediately before the small section; and the step of integrating by the first step of integrating A second integration step of integrating an integrated value of a small section other than the small section excluded by the exclusion step; and a second integration step. A data recording method characterized in that an averaged evaluation value is obtained by using the integrated value obtained by (1), and the recording means is adjusted using the averaged evaluation value.