JP2000187947A - Optical disk recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk recorder capable of reducing the discontinuity of the data due to additional recording. SOLUTION: This recorder is provided with a first synchronizing signal detection circuit 8 for detecting a first synchronizing signal from an optical disk, a second synchronizing signal detection circuit 7 for detecting a second synchronizing signal, a first address detection means 11 for detecting first address information from the optical disk, a second address detection means 10 for detecting second address information, a recording control means 21 for deciding a recording position according to the first synchronizing signal, the second synchronizing signal, the first address information and the second address information, and a recording means 22 for modulating the data and starting the recording from the recording position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording apparatus for recording data on an optical disk.

[0002]

2. Description of the Related Art In recent years, information recording and / or
Various optical disk devices capable of reproducing have been developed. In particular, CD-R and DVD-R as optical disks that can be additionally recorded
In any case, when recording immediately after the previous recording data, discontinuous parts such as double writing and gaps between the previous recording data may occur. There is. The discontinuity of data affects frame synchronization and the like, and the data cannot be normally reproduced. Therefore, when additional recording of new recording data is performed immediately after the already recorded data, the encoder is synchronized with the reproduction synchronization signal of the decoder while the delay time until the reproduction decoding signal is determined is corrected in the encoder. An apparatus such as a "Japanese Patent Publication No. 7-66615 disc recording / reproducing apparatus" has been proposed in which a timing signal for recording is obtained from an encoder to thereby prevent double writing or discontinuity due to a gap between already recorded data.

[0003]

However, in the above-mentioned prior art, since the recording timing is generated from the reproduction synchronization signal (sync) immediately before the sector to be recorded, the sector immediately before recording is unrecorded or has an error. If the sync cannot be read, the recording position may shift.
In addition, there is a possibility that recording will be performed from an erroneous position due to erroneous detection of a sync.

[0004] An optical disk recording apparatus according to the present invention is provided to solve the above-mentioned problem. Even when a sector immediately before recording is unrecorded or an error or the like makes it impossible to read a sync, or when a sync is erroneously detected, the optical disk recording apparatus can be used. The accuracy of the recording position can be maintained.

[0005]

An optical disk recording apparatus according to the present invention is an optical disk recording apparatus for handling an optical disk in which a first synchronization signal is recorded in advance and a second synchronization signal can be recorded by recording. A first synchronizing signal detecting means for detecting the first synchronizing signal from the optical disk; a second synchronizing signal detecting means for detecting the second synchronizing signal; A recording control means for selecting a signal and the second synchronizing signal to determine a recording position, and a recording means for modulating data and starting recording from the recording position, thereby achieving the above object.

[0006] Further, there is provided non-recording detecting means for detecting non-recording, and the recording control means, when the recording position before the recording target position is unrecorded, based on the first synchronization signal. To determine.

In the optical disk, first address information is recorded in advance together with a first synchronization signal, and address detecting means for detecting the first address information; An unrecorded registration unit that determines whether or not the data is registered as an address is provided. The recording control unit transmits the first synchronization signal when the area before the recording target position is registered as unrecorded. Determine the recording position based on the reference.

[0008] If the recording control means has already recorded the position before the recording target position and the state of detection of the first synchronization signal is not good, the recording control means performs recording based on the second synchronization signal. When the position is determined and the state of detection of the first synchronization signal is good, the recording position is determined based on the first synchronization signal.

[0009] If the recording control means has already recorded the position before the recording target position and the state of detection of the second synchronizing signal is not good, the recording control means performs recording based on the first synchronizing signal. When the position is determined and the state of detection of the second synchronization signal is good, the recording position is determined based on the second synchronization signal.

[0010] When the first synchronization signal and the second synchronization signal cannot both be detected, the recording control means may determine whether the first synchronization signal or the second synchronization signal has been detected last.
The recording position is determined based on the synchronization signal.

[0011] The recording control means may further comprise: if a deviation between a recording position determined based on the first synchronization signal and a recording position determined based on the second synchronization signal is larger than a predetermined number, It is determined that a connection error has occurred, and if a connection error has occurred, the recording unit does not perform a recording operation.

Further, first address information is recorded in advance together with the first synchronization signal, and the second address information is recorded.
An optical disc recording apparatus for handling an optical disc capable of recording second address information together with a synchronizing signal, comprising: first address detecting means for detecting the first address information; and detecting the second address information. A second address detecting means for performing the recording, a recording control means for selecting the first address information and the second address information and determining a recording position according to predetermined conditions, and modulating data to record data from the recording position. It has recording means to start.

If the state of the first address information detection is not good, the recording control means determines a recording position based on the second address information, and determines the state of the first address information detection. Is good, the recording position is determined based on the first address information.

If the state of the second address information detection is not good, the recording control means determines a recording position based on the first address information, and determines the state of the second address information detection. Is good, the recording position is determined based on the second address information.

An optical disc recording apparatus for recording data on an optical disc having a track meandering at a constant cycle, comprising: clock generating means for obtaining a clock by multiplying the track meandering cycle; A clock error detecting means for outputting an error signal when deviating, wherein the recording control means determines a clock error when the error signal is detected, and the recording means performs a recording operation when the clock error occurs. Do not do.

In the same recording target position, when it is determined that the clock error has occurred N times or more (N is a natural number), a clock having a fixed frequency is selected as a reference clock, and it is determined that a clock error has occurred. If less than N times, a clock selection circuit for selecting an output of the clock generation means as a reference clock is provided,
The recording control unit and the recording unit operate in synchronization with a reference clock.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. The same reference numerals indicate the same components.

FIG. 1 is a block diagram showing an embodiment of an optical disk recording apparatus according to the present invention. FIG. 2 is a diagram showing a format of an optical disc according to the present invention.

As shown in FIG. 1, an optical disk recording apparatus according to the present invention comprises an optical disk 1, a spindle motor 2, a head 3, a data binarization circuit 4, a pre-pit binarization circuit 5, a wobble binarization circuit 6, and a sink. A detection circuit 7, a pre-pit sync detection circuit 8, a wobble clock generation circuit 9,
Address detection circuit 10, pre-pit address detection circuit 1
1, first preset timing generation circuit 12, second preset timing generation circuit 13, recording determination circuit 1
4, a preset timing selection circuit 15, a clock selection circuit 16, a counter 17, a recording gate generation circuit 18, a modulation circuit 19, and a recording circuit 20.

As shown in FIG. 2, the optical disk 1 according to the present invention has a meandering (wobble) land track and groove track. The truck wobbles periodically.
A certain number of wobbles is included in one frame. On the land track, sync and address data are recorded in advance as pre-pits for each sector. As shown in FIG. 2, one bit is recorded on each side of the inflection point position of the wobbled land track, and several bits from the head of the frame are recorded in the prepit. Data can be recorded in the groove track in a predetermined format. Data recording is performed by changing the reflectance on the medium by irradiating a laser beam or the like. As shown in FIG. 3, the format of the data to be recorded has sync and data for each frame, and one sector has a fixed number of frames. The number of the frame can be determined from the sync pattern. The address data is recorded immediately after the sync of the first frame. When recording data, recording is started from a predetermined position in the sector and ends at the predetermined position. That is, the joining point of the already recorded data and the newly recorded data is a predetermined position in the sector.

For a specific description, the optical disk of this embodiment has the following configuration. A sector has 26 frames. The length of one frame is 1488 bits. The period of the wobble of the track is such that one frame has eight sine waves, that is, 1488/8 = 186.
It is a bit cycle. The joining point of the already recorded data and the newly recorded data is the 1392th bit of the second frame. As shown in FIG. 4, the positional relationship between the prepits and the data recorded in the groove is such that the sync of the data recorded in the groove is located at the center of the prepit at the beginning of the frame. Note that these values are examples.

An RF signal and a broadband pushable TE signal are obtained from the optical disk 1 via the head 3.

The data binarization circuit 4 performs a binarization process on the RF signal and outputs a data binarization signal.

The pre-pit binarization circuit 5, as shown in FIG. 5, performs binarization processing of the wideband pushable TE signal at the pre-pit binarization slice level, and outputs a pre-pit binarization signal. The pre-pit binarization slice level is
Pre-pits can reliably slice the protruding part,
The value is not affected by the meandering portion.

As shown in FIG. 5, the wobble binarization circuit 6 performs a binarization process on the wideband pushable TE signal at the wobble binarization slice level, and outputs a wobble binarization signal. The wobble binarization slice level is set to a value such that the ratio of the H section and the L section of the wobble binarized signal becomes equal on average.

The sync detecting circuit 7 detects a sync pattern from the data binarized signal by pattern matching and outputs it as a sync detection signal. At this time, in order to prevent erroneous detection of the sync pattern due to an error or the like, a gate having a width of several bits before and after one frame after the frame based on the previous sync detection signal is generated, and the sync detection signal is generated only at the time of gate output. It is desirable to output.

The pre-pit sync detecting circuit 8 detects a pre-pit sync pattern from the pre-pit binarized signal by pattern matching and outputs it as a pre-pit sync detection signal. Again, in order to prevent false detection of sync patterns due to errors, etc., a gate with a width of several bits before and after one sector after the pre-pit sync is generated based on the previous pre-pit sync, and the pre-pit sync is detected only when the gate is output. It is desirable to output a signal.

The wobble clock generation circuit 9 multiplies the wobble binarized signal by a predetermined number and generates a wobble clock having a cycle such that one bit of data corresponds to one wobble clock. The predetermined number in this embodiment is 1488 bits / 8
= 186. If the wobble clock cannot be generated properly because the wobble binary signal cannot be obtained well, that is, if the period of the wobble clock deviates from a predetermined range, a wobble clock NG signal is output.

The address detection circuit 10 detects the first frame from the sync detection signal and outputs the first frame from the data binary signal.
It extracts address data included in the frame, performs a predetermined demodulation process, and outputs data address information.

The pre-pit address detection circuit 11 extracts pre-pit address data included in the pre-pit binary signal based on the pre-pit sync detection signal, performs predetermined demodulation processing, and outputs pre-pit address information.

First preset timing generation circuit 12
Generates a preset timing signal by delaying the sync detection signal by a predetermined amount X, and outputs the preset timing signal.

Second preset timing generation circuit 13
Generates a preset timing signal by delaying the pre-pit sync detection signal by a predetermined amount Y and outputs it.

The predetermined amounts X and Y are, as shown in FIG. 6, when the difference between the timing of the sync detection signal output at regular timing and the timing of the pre-pit sync detection signal output at regular timing is Z. , XY = Z. That is, the timing correction is performed by the first preset timing generation circuit 12 and the second preset timing generation circuit 13. When the sync detection signal and the pre-pit sync detection signal have regular timing, the first preset timing signal and the second preset timing signal are output simultaneously.

The recording determination circuit 14 operates as shown in FIG. Upon receiving the recording start command, the process transits to the process 0.

In process 0, it is determined whether or not the target sector to be recorded has been reached. Specifically, the address of the target sector to be recorded is externally given as a prepit target address and a data target address.
The pre-pit address information is compared with the pre-pit target address. If they do not match, the data address information and the data target address are compared. If they match, the process proceeds to process 1, and if they do not match, process 0 is repeated. The pre-pit target address and the data target address are addresses indicating the same physical location on the optical disk. If the wobble clock NG signal is not input in the processing 1, the processing transits to the processing 2 and outputs a control signal for selecting a wobble clock.

When the wobble clock NG signal is input in the processing 1, the processing transits to the processing 3.

In process 3, 1 is added to a wobble clock NG counter (not shown), and the process proceeds to process 4.

In process 4, when the wobble clock NG counter is M times or more (M is a natural number) or more, the process proceeds to process 5, and when the wobble clock NG counter is smaller than M, the process proceeds to 0.

In process 5, the wobble NG counter is reset and the process proceeds to process 6. In the process 6, when it is confirmed that the spindle motor 2 is rotating at a predetermined frequency, the process proceeds to a process 7, and when it is not rotating at the predetermined frequency, the process proceeds to a process 0.

In process 7, the recording clock is switched to a fixed frequency clock. That is, when the clock cannot be correctly extracted from the wobble due to an error or the like, a control signal for selecting a clock of a fixed frequency is output.

In process 8, if the sector immediately before the target sector to be recorded is already registered as a recorded sector, the process proceeds to process 9, and if not, the preset timing selecting circuit 15 A control signal for selecting the second preset timing is output.

In process 9, when the state of sync detection of the sector immediately before the sector to be recorded is good, the process proceeds to process 10, and when the state of sync detection is bad, the second preset timing signal is selected. Outputs control signal.

In process 10, the amount of deviation between the first preset timing signal and the second preset timing signal is detected. If the amount of deviation is large, the process proceeds to step 11, and if the amount of deviation is smaller than the predetermined amount, the process proceeds to step 11. A control signal for selecting a preset timing signal is output.

In process 11, 1 is added to a large deviation amount counter (not shown), and the process proceeds to process 12.

In the process 12, when the count value of the large deviation amount counter is N times or more (N is a natural number), a control signal for selecting the second preset timing signal is outputted, and When the count value is smaller than N, the process transits to the process 0.

The preset timing selection circuit 15 selects either the first preset timing signal or the second preset timing signal according to the control signal output from the recording determination circuit 14, and outputs the selected signal as a preset timing signal.

The clock control circuit 16 includes the recording determination circuit 1
4 selects either a wobble clock or a clock of a fixed frequency according to the control signal output from the control signal 4 and outputs it as a recording clock. The recording clock is used as a reference clock for a counter 17, a recording gate generation circuit 18, and a modulation circuit 19, which will be described later.

The counter 17 presets to a predetermined value by a preset timing signal, and then adds 1 for each recording clock. The predetermined value of the preset is a value in consideration of the delay amount from the head 3 to the first preset timing generation circuit 12 and the second preset timing generation circuit 13. Assuming that the delay amount is V, the preset predetermined value is V.

The recording gate generation circuit 18 outputs a recording gate when the count value becomes equal to or more than the predetermined value A and equal to or less than the predetermined value B. The predetermined values A and B are values in consideration of the delay amounts of the modulation circuit 19, the recording circuit 20, and the head 3 described later. Assuming that this delay amount is W, when recording is started from the connection point shown in FIG. 3, the predetermined value A is 1488 + 1392-
At W, the predetermined value B becomes 1499 + 1392 + 38688-W.

The modulation circuit 19 modulates data at the time of recording gate output and outputs it as recording data.

The recording circuit 20 converts the recording data into a recording waveform and outputs it. The head 3 converts a recording waveform into a laser emission waveform, and records the waveform on the optical disc 1.

With this configuration, as shown in FIG.
If the previous sector has not been recorded, the recording position is determined based on the prepit sync. (B) If the previous sector has been recorded and the sync can be detected well, the recording position is determined based on the sync. , (C) is recorded in the previous sector, but if the sync cannot be detected satisfactorily, the recording position is determined based on the pre-pit sync. That is, since the highest certainty is used as a reference depending on the situation, the accuracy of the recording position can be improved.

Further, when the deviation between the recording position predicted from the sync and the recording position predicted from the pre-pit sync is large, the recording is not performed so that the deviation of the recording position can be prevented.

When the accuracy of the clock generated from the wobble is low, the recording is interrupted until the accuracy becomes high. When it is recognized that it is difficult to generate the clock from the wobble due to an error or the like, the fixed frequency is used. By switching to this clock, the jitter of the recording data can be suppressed.

In the processing 8 of the recording determination circuit 14, the recording / non-recording determination is made by referring to the data of the registered recording / non-recording information, but from the RF signal amplitude and the sync detection state. It may be.

Further, processing is added to the recording determination circuit 14 (not shown). If neither the first preset timing signal nor the second preset timing signal can be detected, the first preset timing signal of the sector before recording is not detected. Using the preset timing signal or the last one of the second preset timing signals, a third preset timing signal that predicts the output position of the preset timing signal of the sector to be recorded is generated by the preset timing signal. A configuration may be adopted in which three preset timing signals are selected. With this configuration, the recording position can be obtained even when neither the pre-pit sync nor the sync in the recording data can be detected.

[0057]

According to the present invention, discontinuous portions such as double writing in the case of recording immediately after the previous recording data and a gap between the recording data and the previous recording data are prevented, The accuracy of the recording position can be maintained even when the sync cannot be read because the sector immediately before recording is unrecorded or an error occurs, or when the sync is erroneously detected.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an optical disk recording device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an optical disk.

FIG. 3 is a diagram showing a configuration of recording data.

FIG. 4 is a diagram showing positions of a pre-pit and a sync.

FIG. 5 is a view for explaining binarization processing in a pre-pit binarization circuit and a wobble binarization circuit;

FIG. 6 is a timing chart illustrating a positional relationship between a sync, a prepit sync, and a timing signal.

FIG. 7 is a flowchart illustrating the operation of a recording determination circuit.

FIG. 8 is a timing chart illustrating an operation at the time of recording.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk 2 Spindle motor 3 Head 4 Data binarization circuit 5 Prepit binarization circuit 6 Wobble binarization circuit 7 Sync detection circuit 8 Prepit sync detection circuit 9 Wobble clock generation circuit 10 Address detection circuit 11 Prepit address detection circuit 12 first preset timing generation circuit 13 second preset timing generation circuit 14 recording determination circuit 15 preset timing selection circuit 16 clock selection circuit 17 counter 18 recording gate generation circuit 19 modulation circuit 20 recording circuit 21 recording control means 22 recording means

Claims (12)

[Claims] An optical disk recording apparatus for handling an optical disk in which a first synchronization signal is recorded in advance and on which a second synchronization signal can be recorded by recording, wherein the first synchronization signal is transmitted from the optical disk. First synchronizing signal detecting means for detecting, second synchronizing signal detecting means for detecting the second synchronizing signal, and selecting and recording the first synchronizing signal and the second synchronizing signal according to predetermined conditions An optical disc recording apparatus comprising: a recording control unit for determining a position; and a recording unit for modulating data and starting recording from the recording position. 2. An unrecorded detecting means for detecting unrecorded data, wherein the recording control means determines a recording position on the basis of the first synchronization signal when the recording position before the recording target position is unrecorded. The optical disk recording device according to claim 1, wherein: 3. An optical disc in which first address information is recorded in advance together with a first synchronization signal, address detecting means for detecting the first address information, and an unrecorded first address information. An unrecorded registration unit that determines whether or not the data is registered as an address is provided. The recording control unit transmits the first synchronization signal when the area before the recording target position is registered as unrecorded. 2. The optical disc recording apparatus according to claim 1, wherein the recording position is determined based on a reference. 4. The recording control means according to claim 2, wherein when the position before the recording target position has already been recorded and the state of detection of the first synchronization signal is not good, the recording is performed based on the second synchronization signal. 4. The optical disc recording apparatus according to claim 1, wherein the position is determined, and when the state of detection of the first synchronization signal is good, the recording position is determined based on the first synchronization signal. 5. The recording control means according to claim 1, wherein the recording before the recording target position has already been recorded and the state of detection of the second synchronization signal is not good, the recording is performed based on the first synchronization signal. 4. The optical disc recording apparatus according to claim 1, wherein the position is determined, and when the state of detection of the second synchronization signal is good, the recording position is determined based on the second synchronization signal. 6. The recording control means, if both the first synchronization signal and the second synchronization signal cannot be detected, based on the last detected first synchronization signal or the second synchronization signal. The optical disk recording device according to claim 1, wherein the recording position is determined. 7. The recording control means according to claim 1, wherein a difference between a recording position determined based on said first synchronization signal and a recording position determined based on said second synchronization signal is larger than a predetermined number. 2. The optical disc recording apparatus according to claim 1, wherein the recording unit determines that a connection error has occurred, and does not perform a recording operation when the connection error occurs. 8. An optical disc recording apparatus for handling an optical disc in which first address information is recorded in advance together with a first synchronization signal, and which can record the second address information together with a second synchronization signal by recording. A first address detecting means for detecting the first address information, a second address detecting means for detecting the second address information, and the first address information and the second An optical disc recording apparatus comprising: a recording control means for selecting address information of No. 2 to determine a recording position; and a recording means for modulating data and starting recording from the recording position. 9. The recording control means, if the state of detection of the first address information is not good, determines a recording position based on the second address information, and determines the state of detection of the first address information. 9. The optical disc recording apparatus according to claim 8, wherein if the value is good, the recording position is determined based on the first address information. 10. The recording control means, if the state of the second address information detection is not good, determines a recording position based on the first address information, and determines the state of the second address information detection. 9. The optical disk recording apparatus according to claim 8, wherein if the value is good, the recording position is determined based on the second address information. 11. An optical disk recording apparatus for recording data on an optical disk having a track meandering at a constant cycle, comprising: clock generating means for obtaining a clock by multiplying a track meandering cycle; A clock error detecting means for outputting an error signal when deviating, wherein the recording control means determines a clock error when the error signal is detected, and the recording means performs a recording operation when the clock error occurs. 2. The optical disc recording apparatus according to claim 1, wherein the recording is not performed. 12. In the same recording target position, when the determination of the clock error has continued N times or more (N is a natural number), a clock of a fixed frequency is selected as a reference clock, and the determination of a clock error is performed. 2. The method according to claim 1, further comprising a clock selection circuit for selecting an output of said clock generation means as a reference clock when the number is less than N times, wherein said recording control means and said recording means operate in synchronization with the reference clock. 12. The optical disk recording device according to item 11.