JP2755017B2 - Recording signal check circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage device for recording and reproducing signals, such as an optical disk device.

[0002]

2. Description of the Related Art In recent years, this type of information storage device has been rapidly changing to larger capacity and smaller size, and the technology has been remarkably advanced.

Hereinafter, an example of the above-mentioned conventional information storage device will be described with reference to the drawings.

FIG. 7 shows a configuration of a conventional information storage device. In FIG. 7, reference numeral 51 denotes a storage carrier. 52
Is a pickup for reproducing information stored on the storage carrier 51 or recording information on the storage carrier. 53 is an analog signal processing circuit, and 54 is a pulsing circuit for converting an analog signal into a digital signal. 55 is a decoder and control system. 56 is a recording control means for picking up 5
Add control to 2.

The operation of the information storage device configured as described above will be described below.

First, in recording and reproducing information in this type of information storage device, a pickup 52 for recording or reproducing information on or from a storage carrier 51 is controlled by a recording control means 56 at the time of recording, and a physical quantity to be controlled is controlled. Then, information is recorded on the storage carrier 51 by giving a physical property change such as a change in reflectance or a magnetic field reversal. At the time of reproduction, the analog signal 531 is reproduced as an analog signal 521 that changes sinusoidally and processed through the analog signal processing circuit 53.
Is converted into a digital signal 541 by the pulsing means 54, and is converted as reproduction information to a higher-level device by the decoder 55. Here, the data 54 sent to the decoder 55
1 is independent of any condition of the analog signal 521,
The data must be faithfully converted from the analog signal 531. An information storage device such as an optical disk device has a higher reproduction capability than immediately after information has been recorded on the information storage carrier 51 due to the passage of time or a change in environment due to the quality and dust of the information storage carrier 51 and deterioration of the performance of the information storage device. Decrease. In consideration of this performance degradation, in order to guarantee that the reproduction capability is maintained at a certain level or more, immediately after the information is recorded, the data is reproduced under the strict condition of the threshold level for pulsing compared to the normal reproduction, and the information is normally stored. A verify operation for confirming that information can be stored on the carrier 51 is used.

[0007]

As described above, in a conventional information storage device, a verify operation is performed in which information is recorded on a storage carrier, and immediately after that, reproduction is attempted.

[0008] The information storage device immediately after recording the information,
Thereafter, when reproducing the recorded information, the quality of the recorded data may be degraded due to a time difference, a change in the use environment, and the like. Therefore, when recording information, it is necessary to improve the quality of the information at the time of recording by completing the recording only for the recording that can be reproduced under more severe conditions than during the normal reproduction. In the verify operation, the information recorded on the storage carrier is read by a pickup and converted into an analog signal as an electric quantity, and then the information converted into a digital signal is converted into data by a decoder to check that it is the same as the recorded information. I do. Thereafter, the data is transferred to the host device.
In this case, a defect of the storage medium and dust generated in a path between the storage medium and the pickup, misalignment, defocus, off-track, deterioration of mechanical characteristics, deterioration of the laser diode, or external temperature or vibration. In some cases, information cannot be recorded normally due to deterioration of the environment or the like.

At this time, in the case of data rescued at a level near the limit of the error correction capability of the decoder and its control unit, there is a problem that there is a high possibility that the data cannot be reproduced due to the deterioration of the reproducing conditions thereafter. Had.

The present invention has been made in view of the above problems, and provides a recording signal check circuit for realizing a method of improving the quality of data stored on a storage carrier to increase a reproduction margin. .

[0011]

In order to solve the above problems, a recording signal check circuit according to the present invention has a pickup for recording information on a storage carrier or reproducing the recorded information, In an information storage device which converts a signal from a pickup into an electric quantity and reproduces data via an analog signal, an envelope detecting means for detecting an envelope of the reproduced signal, and a fluctuation for detecting a change in an output of the envelope detecting means. It is characterized by comprising detection means, envelope enhancement means for enhancing the output detected by the fluctuation detection means, and reproduction signal modulation means for modulating a reproduction signal with a signal obtained by the envelope enhancement means.

A timing detecting means for detecting a change timing output from a signal detected by the fluctuation detecting means; a gate generating means for forming a gate at an arbitrary time from the timing obtained by the timing detecting means; A stop means for stopping a reproduction signal based on a signal obtained by the generation means is provided.

A / D conversion means for converting the output of the envelope detection means into a digital value, level comparison means for comparing the converted digital signal with a reference level,
It is characterized by including gate generation means for generating a gate signal for an arbitrary time by the output of the level comparison means, and reproduction control means for disabling reproduction of the signal by the output of the gate generation means.

Alternatively, offset level storage means for holding the value converted by the A / D conversion means using the initial value of the signal output from the envelope detection means as an offset, and detecting the envelope when reproducing the signal. A combination of the above means, including an offset operation means for performing an operation on a digital signal obtained by converting a signal output from the means into a digital value by the A / D conversion means with a signal stored in the offset level storage means. Is combined with one or more.

[0015]

With the configuration described above, the recording signal check circuit of the present invention detects a change in the envelope of an analog signal when the verify operation immediately after recording the information is performed, and detects the change. By emphasizing the output, the data error is intentionally enlarged by a certain amount, the apparent data quality is reduced, and the error is more likely to occur on the host device side. When a change in the envelope is detected, a gate is generated at an arbitrary time, and the data supplied to the decoder and the control system is stopped at the gate, thereby expanding the data error in time and apparently improving the data quality. The error is likely to occur on the host device side.

Thus, in the verification performed immediately after recording of information, reproduction is performed under more severe conditions than normal reproduction. At that time, recording is completed only when reproduction is possible. Can be guaranteed at a high level, and the reading margin can be greatly increased during normal reproduction.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A recording signal check circuit according to one embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a recording signal check circuit according to an embodiment of the present invention. In FIG. 1, 1 is an analog signal processing circuit, 2 is an envelope detection circuit, 11 is a storage carrier, 12 is a pickup, 13 is a pulsing circuit, 7 is a decoder / control system, 21 is an envelope enhancement circuit, and 22 is modulation. Circuit.

The operation of the recording signal check circuit configured as described above will be described below with reference to FIGS.

First, FIG. 1 shows a circuit for detecting a change in an envelope to sharpen a verify condition, thereby obtaining an effect of improving the quality of recorded information. The information recorded on the storage carrier 11 is detected by the pickup 12, converted into an electric signal, and input to the analog signal circuit 1.
The output of the analog signal circuit 1 is supplied to an envelope detection circuit 2. The output of the envelope detection circuit 2 becomes a waveform 201 and is input to the envelope enhancement circuit 21. The envelope information emphasized by the envelope emphasis circuit is input to the reproduction signal modulation circuit 22, and the modulation circuit 22 modulates the signal 101 output from the analog signal processing circuit 1 according to the envelope information. The output of the modulating circuit 22 is
, And becomes data to be passed to the host device by the decoder / control system 7.

The recording signal check circuit configured as described above will be described with reference to FIG.

FIG. 1 is a block diagram showing the configuration of the present embodiment. In a verify operation performed immediately after recording information on a storage medium 11, information recorded on the recording medium 11 is picked up by a pickup 12. The analog signal is converted to an electric analog signal, and disturbance other than information required by the analog signal processing circuit 1 is eliminated and sent to the reproduction signal modulation circuit 22. Here, the envelope information of the output 101 of the analog signal processing circuit 1 is detected by the envelope detection circuit 2, and the envelope information detected by the envelope detection circuit 2 is emphasized by the envelope emphasis circuit 21.
By modulating the output signal 101 of the analog signal processing circuit 1 with this emphasized envelope information, the quality of reproduced information is degraded. The signal 221 is converted into a pulse output 131 by the pulse generator 13, and is converted into information to be sent to a higher-level device by a decoder / control system. As described above, according to the present embodiment, the envelope detection circuit 2 and the envelope enhancement circuit 2
1 and the reproduction signal modulation circuit 22 provided in the reproduction circuit as shown in FIG. 1 to realize a method of increasing the quality of data stored on the storage carrier and increasing the reproduction margin. be able to.

Here, the modulation may be amplitude modulation, addition modulation, or both upper and lower envelope detection, and modulation may be performed in a similar manner to the modulation of the output signal 101. Focusing on the increase in jitter, it is effective to realize apparent frequency modulation using a variable delay line using a memory or a CCD and a variable clock whose frequency is changed by the output of an envelope enhancement circuit. It is desirable that the degree of modulation enhancement be selected to be about 1.5 to 3 times the modulation degree of the output signal 101.
Alternatively, it is also effective to provide a limiter or the like that does not fall into overmodulation that maximizes 100% modulation.

A second embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram of a recording information check circuit according to a second embodiment of the present invention.

The difference from FIG. 1 is that the output 201 of the envelope detection circuit 2 enters the fluctuation detection circuit 3 and the output signal 301 enters the timing detection circuit 4. Timing detection circuit 4
Is output to the gate generation circuit 5, the output 501 of the gate generation circuit 5 enters the data cut 6, and the circuit is configured to cut the output signal 131 of the pulse generation circuit 13.

The operation of the recording signal check circuit configured as described above will be described below with reference to FIG. 2 and FIG. 3 showing main waveforms. The number assigned in FIG. 3 matches the signal designation number in FIG.

The output 101 of the analog signal processing circuit 1 is supplied to an envelope detection circuit 2 and a pulsing circuit 13, and a fluctuation is detected by the fluctuation detection circuit 3 from the output of the envelope detection circuit 2, and the fluctuation of the output 401 is detected. The output of the analog signal processing circuit 1 is pulsed by a timing detection circuit 4 for detecting the timing when the magnitude exceeds an arbitrary level, a gate generation circuit 5 for masking the output data from its output signal 401, and a gate generation circuit 5. By providing the data cut 6 that gates the output of the pulsating circuit to be converted, the following effects can be obtained.

As a circuit for detecting a change in the envelope 201, there is a method of providing a fixed threshold value and comparing the level with the signal 301. The gate generation circuit 5 generates a gate signal 501 having an arbitrary time τ width sufficiently longer than the timings 401 to 401 detected by the timing detection circuit 4. The time τ has the meaning of expanding the detected change in the envelope in the time axis direction. Blocking the data continuously in the time axis direction has the effect of equivalently lowering the data quality. The time τ can be set to a desired time regardless of whether the width is such that the information can be corrected by the decoder / control system 7 or the width cannot be corrected.

On the other hand, the analog signal 101 input to the pulsing circuit 13 is output as a signal 131 and input to the data cut circuit 6. The data cut circuit 6 gates the output signal 131 of the pulsing circuit 13 with the signal 501 generated by the gate generation circuit 5, and generates a gate signal 501.
The output signal 131 of the pulsing circuit 13 is cut by the width. The output of the data cut circuit is like signal 601.
As means for detecting a change in the envelope 201, a change rate of the envelope is detected by comparing the output of the envelope detection circuit 2 via a differentiating circuit or the like, and when the change rate is equal to or more than a certain value. There is a method of outputting a signal to the timing detection circuit 4. By doing so, it is possible to realize a method of improving the quality of data stored on the storage carrier and increasing the reproduction margin.

Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a block diagram of a recording information check circuit according to a third embodiment of the present invention.

The difference from FIG. 2 is that the output 201 of the envelope detection circuit 2 enters the A / D conversion output circuit 31 and its output signal 3
11 enters the level comparison circuit 32. Level comparison circuit 3
2 is input to the gate generation circuit 33, the output 331 of the gate generation circuit 33 enters the data cut 34, and the data cut 34 is the output 131 of the pulse generation circuit 13.
That is, the circuit is configured so as to cut off.

The operation of the recording signal check circuit configured as described above will be described below.

The output 101 of the analog signal processing circuit 1 is supplied to the envelope detection circuit 2 and the pulsing circuit 13, and a change is detected from the output of the envelope detection circuit 2 by the A / D conversion circuit 31. A level comparing circuit 32 for comparing the magnitude of the fluctuation with an arbitrary level;
And a data cut 3 for controlling the reproduced information pulsed by the output 321 of the gate generation circuit 32.
By providing 4, a method of improving the quality of data stored on the storage carrier and increasing the reproduction margin can be realized.

Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a block diagram of a recording information check circuit according to a fourth embodiment of the present invention.

The difference from FIG. 2 is that the output 201 of the envelope detection circuit 2 enters the A / D conversion output circuit 31 and its output signal 3
11 enters the offset level storage circuit 41 and the offset operation circuit 42. The output 411 of the offset level storage circuit 41 is input to the offset operation circuit 42, and the output 311 of the A / D conversion circuit 31 is also input to the offset operation circuit 42 at the same time. Output signal 4 of offset operation circuit 42
21 is input to the data cut 43, and the data cut 43
Is that the circuit is configured to modulate the signal 131 pulsed by the output signal 421 of the offset operation circuit 42.

The operation of the recording signal check circuit configured as described above will be described below.

The output 101 of the analog signal processing circuit 1 is supplied to the envelope detection circuit 2 and the pulsing circuit 13, and the output of the envelope detection circuit 2 is detected by the A / D conversion circuit 31 to detect fluctuations. The output is supplied to an offset level storage circuit 41 and an offset operation circuit 42. The offset level storage circuit 41 uses the data given from the A / D conversion circuit 31 as an offset at the beginning of the operation of the reproduction system circuit, for example, when the power is turned on or when the storage carrier is replaced. Remember. A data cut is performed by performing an arithmetic operation on the envelope information obtained during reproduction based on the value to eliminate the offset of the circuit from the envelope information.
3, the data cut 43 passes through the pulsed data 131 according to the envelope information from which the offset has been removed.
A method of increasing the quality of data stored on a storage carrier by increasing the quality of data stored on the storage carrier by providing a circuit for modulating the stop in the reproduction circuit as shown in FIG. Can be realized.

Hereinafter, a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a block diagram of a recording information check circuit according to a fifth embodiment of the present invention.

The difference from FIG. 1 is that the output 201 of the envelope detection circuit 2 enters the A / D conversion output circuit 61 and its output signal 6
11 enters the envelope emphasis calculation circuit 63. The A / D conversion circuit 61 is configured such that the envelope information signal 201 obtained from the envelope detection circuit 2 is A / D-converted at the timing generated by the sampling timing generation circuit 62.

The operation of the recording signal check circuit configured as described above will be described below.

The output 101 of the analog signal processing circuit 1 is supplied to the envelope detection circuit 2 and the modulation circuit 64, and the output of the envelope detection circuit 2 detects the fluctuation of the reproduction signal by the A / D conversion circuit 61 and the sampling timing. A modulation circuit 64 performs A / D conversion of the envelope information signal 201 at the timing generated by the generation circuit 62 and emphasizes the output of the envelope information signal 201 by an envelope emphasis calculation circuit 63 to perform modulation such as amplitude modulation by digital information using an attenuator or the like. To enter.
The modulation circuit 64 modulates the output signal 101 of the analog signal processing circuit 1 with the output of the envelope emphasis calculation circuit 63 and inputs the modulated signal to the pulsing circuit 13. The signal 641 is converted to a pulse
The signal is converted into a pulsed output 131 by 3 and is converted by the decoder / control circuit 8 into information to be sent to a higher-level device. As described above, according to the present embodiment, the envelope detection circuit 2 and the A / D
Conversion circuit 61 and sampling timing generation circuit 62
By providing the envelope emphasis calculation circuit 63 and the modulation circuit 64 in the reproduction circuit as shown in FIG. 6, the quality of data stored on the storage carrier can be made higher to increase the reproduction margin. The method can be realized.

As described above, the recording signal check circuit of the present invention includes a pickup for recording information on a storage carrier or reproducing the recorded information, and a signal converted into an electric quantity by the pickup. An analog signal processing circuit for processing, an envelope detection circuit for detecting an envelope of a reproduction signal output from the analog signal processing circuit, a fluctuation detection circuit for detecting a change in an output of the envelope detection circuit,
An envelope enhancement circuit that enhances the output detected by the fluctuation detection circuit, and a reproduction signal modulation circuit that modulates a reproduction signal with a signal obtained by the envelope enhancement circuit, or is detected by the fluctuation detection circuit. A timing detection circuit for detecting a change timing output from a signal, a gate generation circuit for forming a gate at an arbitrary time from the timing obtained by the timing detection circuit, and a reproduction signal stopped by a signal obtained by the gate generation circuit An A / D conversion circuit for converting the output of the envelope detection circuit into a digital value, a level comparison circuit for comparing the converted digital signal with a reference level, and an output of the level comparison circuit A gate generation circuit that generates a gate signal at an arbitrary time according to An offset level storage circuit comprising a data cut that disables reproduction of the data, or holding a value converted by the A / D conversion circuit using an initial value of a signal output from the envelope detection circuit as an offset; An offset operation circuit for performing an operation on a digital signal obtained by converting a signal output from the envelope detection circuit into a digital value by the A / D conversion circuit at the time of signal reproduction with a signal stored in the offset level storage circuit Detects a change in the reproduced analog signal, modulates data supplied to a decoder and a control system, expands data errors, apparently degrades data quality, and easily causes errors on the host device side. To be.

By doing so, the recording is completed only when reproduction becomes possible even under severe conditions, so that the quality of the signal at the time of recording can be improved, and the margin during normal reproduction can be greatly increased. It becomes possible to spread.

In the embodiment, the case where information is recorded on the optical storage medium has been described. However, the present invention can be applied to a magnetic medium or another recording medium regardless of the type of the medium. In addition, this technique is also applicable to information communication means and the like, in which test information is transmitted and received before transmission and reception of main information and the state of a transmission path is confirmed.

[0045]

As described above, the recording signal check circuit of the present invention records information on a storage carrier, or detects and enhances the envelope of the recorded information signal, and then enhances the signal. The data error is enlarged by modulating or intermittently reproducing the reproduction signal in the amplitude direction and the time axis direction based on the envelope signal and supplying it to the decoder and control system. The recording is completed only when playback is possible even under severe conditions, so that the quality of the signal at the time of recording can be improved. The reading margin after the change or the lapse of time can be greatly expanded.

[Brief description of the drawings]

FIG. 1 is a block diagram of a recording signal check circuit according to an embodiment of the present invention.

FIG. 2 is a block diagram of a recording signal check circuit according to a second embodiment of the present invention;

FIG. 3 is a signal waveform diagram of a recording signal check circuit according to a second embodiment of the present invention.

FIG. 4 is a block diagram of a recording signal check circuit according to a third embodiment of the present invention;

FIG. 5 is a block diagram of a recording signal check circuit according to a fourth embodiment of the present invention.

FIG. 6 is a block diagram of a recording signal check circuit according to a fifth embodiment of the present invention.

FIG. 7 is a block diagram of a conventional reproducing circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Analog signal circuit 2 Envelope detection circuit 3 Fluctuation detection circuit 4 Timing detection circuit 5 Gate generation circuit 6 Data cut circuit 7 Decoder / control system 8 Decoder / control circuit 11 Storage carrier 12 Pickup 13 Pulsing circuit 21 Envelope enhancement circuit 22 Reproduction signal modulation circuit 31 A / D conversion circuit 32 Level comparison circuit 33 Gate generation circuit 34 Data cut 41 Offset level storage circuit 42 Offset operation circuit 43 Data cut 51 Storage carrier 52 Pickup 53 Analog signal processing circuit 54 Pulse conversion circuit 55 Decoder / Control system 56 Recording control circuit 61 A / D conversion circuit 62 Sampling timing generation circuit 63 Envelope enhancement arithmetic circuit 64 Modulation circuit

Claims (7)

(57) [Claims] 1. An information storage device having a pickup for recording or reproducing information on a storage carrier and converting a reproduction signal from the pickup into an electric quantity and reproducing data, detects an envelope of the reproduction signal. Envelope detection means, variation detection means for detecting a change in the output of the envelope detection means, envelope enhancement means for enhancing the output detected by the variation detection means, and the envelope enhancement means. check circuit of a recording signal, characterized in that it comprises a <br/> a reproduction signal modulation means for modulating the reproduction signal by the signal. 2. An information storage device having a pickup for recording or reproducing information on a storage carrier and converting a reproduction signal from the pickup into an electric quantity and reproducing data, detects an envelope of the reproduction signal. Envelope detection means, fluctuation detection means for detecting a change in the output of the envelope detection means, and a timing detection means for detecting a change timing output from a signal detected by the fluctuation detection means,
A recording method comprising: a gate generating means for forming a gate at an arbitrary time from the timing obtained by the timing detecting means; and a stopping means for stopping a reproduction signal for an arbitrary time by a signal obtained by the gate generating means. Signal check circuit. 3. An analog-to-digital (A / D) converter for converting an analog signal output from an envelope detector to a digital signal, a level comparator for comparing the converted digital signal with a reference level, and a level comparator. a gate generating means for generating a gate signal of an arbitrary time by the output, check circuit of claim 1 recording signal, wherein the includes a reproduction control means for disabling the reproduction of the signal by the output of the gate generating means . 4. An information storage device having a pickup for recording or reproducing information on a storage carrier and converting a reproduction signal from the pickup into an electric quantity and reproducing data, detects an envelope of the reproduction signal. Envelope detection means; offset level storage means for holding a value converted by the A / D conversion means using an initial value of a signal output from the envelope detection means as an offset; Offset calculation means for calculating a digital signal obtained by converting a signal output from the line detection means into a digital value by the A / D conversion means with a signal stored in the offset level storage means;
A level comparator that compares the output of the means with a reference level
Stage and gate at any time by the output of the level comparison means
A gate generating means for generating a signal;
A recording signal check circuit , comprising: reproduction control means for disabling reproduction of a signal by an output . 5. A sampling timing generating means for sampling a signal output from an envelope detecting means at an arbitrary time, an A / D converting means for converting an output from said sampling timing generating means into a digital signal, and a level comparing means for comparing the level of a reference digital signal, check circuit of a recording signal according to claim 1, comprising a reproduction control means for disabling the reproduction of the signal by the output of the level comparing means. 6. The recording signal check circuit according to claim 2, wherein the fluctuation detection means outputs a timing output when the level change of the envelope detection means is equal to or more than a certain level. 7. The recording signal check circuit according to claim 2, wherein the fluctuation detecting means outputs a timing output when the rate of change of the envelope detecting means is equal to or higher than a predetermined value.