JP2003308664A - Disk recording and reproducing apparatus and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably generate a clock and detect an LPP (Land Pre-Pit). <P>SOLUTION: Only a first pre-pit in a frame being a source of a synchronizing signal from an extracted pre-pit, the phase of a wobble signal is adjusted by a pre-pit signal detected for the particular number of times for a prescribed period, and a recording clock is generated by using the wobble signal whose phase is adjusted. Thus, the clock can stably be generated and the LPP can be detected. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc recording / reproducing apparatus for recording / reproducing data on / from a recording medium such as a recordable disc.

[0002]

2. Description of the Related Art DVD (Digital Video Disc)
Is a medium having about 7 times the capacity of a CD (compact disc). There are DVD-RAM, DVD-R, and DVD-RW that can record data on a DVD. The DVD-R aims to improve the functions and performance of the CD-R as a write-once recordable disc, and as a pre-format of the DVD-R disc that can be expected to be marketable like the CD-R, it is a groove on the disc. The structure has a minute waviness called a wobble, and a pit called a land prepit is provided at a predetermined position on the land. As a disc recording / reproducing device, a prepit signal and a wobble signal are extracted from a signal obtained from the disc, and the wobble is used as a reference for generating a clock signal for recording, or a recording position is obtained as data obtained from the prepit signal. You can ask.

The wobble and LPP have a synchronous relationship and a specific phase relationship. The relationship will be described with reference to FIGS. 2 and 3. As shown in FIG. 2, there are eight wobble periods in one sync frame. Further, as shown in FIG. 3, one sector is composed of 26 sync frames, and one ECC block is composed of 16 sectors. The pre-pit is formed with two sync frames as one unit, and is formed in either an even (EVEN) sync frame or an odd (ODD) sync frame. FIG. 2 shows an example of being formed in the EVEN frame, and pits (solid arrow in the figure) are formed in the wobbles from the beginning to the third of eight cycles in one sync frame. As shown in FIG. 3, the synchronization signal is represented at the head of the sector and the data signal is represented by pre-pits after that, so that information necessary for recording such as disc information and address information can be obtained.

In order to correctly record data at a desired position on the disk, a recording clock is generated by wobble,
Accurate information detection by LPP is required.

[0005]

When scratches, dust, etc. are present on the disk, noise on the pulse may be erroneously detected as prepits. Further, when the disc information reading performance that is easily seen on the disc after recording is poor, there is a problem that the phase of the clock and the LPP data is disturbed by the wobble, and the data cannot be detected correctly.

[0006]

[Means for Solving the Problem] The above-mentioned problem is the first LPP.
This can be improved by realizing stable clock generation and reliable LPP detection by the disc recording / reproducing apparatus having a unit for generating a recording clock whose phase is adjusted according to the detection result.

That is, a recording medium on a disk in which data is recorded on a track, the track forming a frame of wobbles wobbled at a predetermined frequency and the wobbles of m (m: natural number) period, There is a predetermined phase relationship with the wobble, and n (n:
A natural number) pre-pits A, which are arranged at predetermined positions on the frame, and pre-pits B, which are arranged or not arranged by data at predetermined positions on the frame. In a disc recording / reproducing apparatus for recording / reproducing data on / from a medium, a means for extracting a wobble signal on the disc, a means for extracting a prepit signal, and a means for generating a clock signal for recording by the extracted wobble signal. As a signal for adjusting the phase of the clock signal, it has means for selecting and outputting only the prepit signal satisfying a specific condition from the extracted prepit signals, and means for adjusting the phase of the generated clock signal by the prepit signal. , A disc recording / reproducing that selects only the pre-pit A signal arranged at a predetermined position on the frame. It can be improved by the device.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a disk recording / reproducing apparatus which is a first embodiment of the present invention. Reference numeral 101 denotes a disc, on which prepits including address information and wobbled groove tracks are formed in advance. Reference numeral 102 is a pickup that records / reproduces data on the disk 101, and 103 is a spindle motor that rotates the disk. A servo 104 controls the optical pickup 102 and the like. 105 is a laser driver. Reference numeral 106 is a read channel that performs waveform equalization processing, binarization, and synchronous clock generation of the analog reproduction signal read from the disk 101, and also extracts a wobble signal and a prepit signal from the read signal. 107 is a PLL 1, 1 that generates a protected wobble signal synchronized with the wobble
Reference numeral 08 is a means for adjusting the phase of the protection wobble signal based on the first LPP detection result, and 109 is a PLL 2 for generating the recording clock by the phase adjusted wobble signal. 110 is a means for detecting the first LPP in the frame from the obtained LPP, and 111 is a means for decoding the disc information and address information from the LPP. 112 is an encoder that scrambles the input data, adds an error correction code, and modulates the data to generate recorded data. , A decoder for generating reproduction data. Reference numeral 114 is an interface for handling input / output data from a host or the like, and 115 is a microcomputer that controls the system.

The recording operation of the disc recording / reproducing apparatus shown in FIG. 1 will be described below. Interface 114
The data input via the encoder 112 is subjected to scrambling processing, error correction code addition, and modulation processing in the encoder 112, and is recorded on the disk 101 via the laser driver 105 and the recording pickup 102. The recording start position at that time is recorded by detecting address information from the LPP data preformatted on the disc 101. Disc 10
Extract wobble and LPP from the data obtained from 1,
The wobble is input to the PLL 1 107, and the LPP is input to the 1st LPP detection circuit. The extracted wobble is in PLL1 107
It generates a protection wobble signal with a period of 186T (1T is a channel bit clock period). Further, the phase is adjusted in the phase adjusting circuit 108 by comparing with the phase of the LPP signal detected in the 1st LPP detecting circuit 110. Further, a recording clock is generated in the PLL 2 109 from the phase-adjusted protection wobble signal.
Further, the 1st LPP detection circuit 110 detects the first LPP signal in the frame from the extracted LPP. The LPP signal exists from the beginning to the third in one sync frame.
Also, it exists in either the EVEN frame or the ODD frame, and the first LPP is always present. for that reason,
Since the first LPP exists every 8 or 16 cycles of 186T which is one wobble cycle, a detection section having a fixed cycle is provided. FIG. 4 is a diagram showing the first LPP detection timing in a frame. FIG. 5 is a detailed diagram of the 1st LPP detection circuit. The detection method will be described with reference to both drawings. Input LPP
LPP detected first in the window generation circuit 501 by the signal
A detection window with a constant period is generated from. The fixed period in this case is one frame section. Generated detection window and input L
A protection LPP signal is generated by the AND gate signal 502 of the PP signal, and the determination circuit 503 checks the protection LPP signal. If the protection LPP signal can be detected a certain number of times,
Since it is equivalent to always detecting the first LPP in the frame, the LPP detection window is fixed and the protection LPP signal is selected.
Output as LPP signal. However, for some reason, the first LPP is erroneously
Is not detected (when the window generation is started from the second LPP in Fig. 4), the detection of the specified number of times cannot be guaranteed even if it is detected in a fixed cycle, so the current LPP detection window is temporarily It is assumed that the window is released and the window is again generated by the LPP input signal. Therefore, using the obtained first LPP signal,
Adjusts the phase of the wobble signal. Further, by detecting the second and third LPP with reference to the first LPP detection timing, the LPP decoding circuit 111 decodes the LPP data, generates synchronization information and address information, etc., and sets the recording start position. Output to the encoder 112. Therefore,
The recording clock is frequency-synchronized with the wobble and phase-synchronized with the first LPP, which enables stable recording clock generation and LPP.
Detection can be performed.

FIG. 6 is a block diagram showing a detailed view of the 1st LPP detection circuit in the disk recording / reproducing apparatus according to the second embodiment of the present invention. In addition to the 1st LPP detection circuit described in the first embodiment, another window generation circuit 602 is added. As shown in the phase relationship between the wobble and the pre-pit shown in FIG. 8, the pre-pit exists at the position of 1/4 period (186 / 4T) in one wobble period (186T). Therefore, in addition to the window generation 601 in the LPP cycle, the window generation is also performed from the protection wobble signal generated by the PLL1 107. Create a window with an arbitrary width centered at the 186 / 4T position. Therefore, in the input LPP signal, the selected LPP signal can be obtained by the two generation windows, the generation window obtained from the phase relationship of the wobble signal and the generation window obtained from the first LPP cycle.
Therefore, by using the obtained LPP signal, the phase of the wobble signal is adjusted, and by generating the recording clock from the wobble signal after the phase adjustment, stable recording clock generation, LP
P detection can be performed.

FIG. 7 is a block diagram showing a detailed view of the 1st LPP detection circuit in the disk recording / reproducing apparatus according to the third embodiment of the present invention. The generation windows by the two window generation circuits of the 1st LPP detection circuit described in the second embodiment are configured so that the output can be switched. In the generation window obtained from the first LPP cycle of the frame and the generation window obtained from the phase relationship of the wobble signal, in addition to performing LPP detection with two generation windows, only one of the generation windows, or It is possible to switch such as not performing selection by the generation window. Therefore, the optimum reading performance can be maintained by switching the setting according to the recording state of the disc to be read. Therefore, the obtained LPP signal is used to adjust the phase of the wobble signal, and the recording clock is generated from the wobble signal after the phase adjustment, whereby stable recording clock generation and LPP detection can be performed.

[0013]

As described above, the disk recording / reproducing apparatus of the present invention can perform stable clock generation and LPP detection.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a disk recording / reproducing apparatus that is a first embodiment of the present invention.

FIG. 2 is a diagram showing a sync frame structure.

FIG. 3 is a diagram showing a sector structure.

FIG. 4 is a diagram showing a detection timing of 1st LPP in a frame.

FIG. 5 is a block diagram showing a configuration of a 1st LPP detection circuit in the disc recording / reproducing apparatus according to the first embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a 1st LPP detection circuit in a disc recording / reproducing apparatus which is a second embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a 1st LPP detection circuit in a disk recording / reproducing apparatus which is a third embodiment of the present invention.

FIG. 8 is a diagram showing a phase relationship between wobbles and prepits.

[Explanation of symbols]

101 ... Disk, 102 ... Pickup, 103 ... Spindle motor, 104 ... Servo, 105 ... Laser driver, 106 ...
Read channel, 107 ... PLL1, 108 ... Phase adjustment circuit, 109
... PLL2, 110 ... 1st LPP detection circuit, 111 ... LPP decoding circuit, 112 ... Encoder, 113 ... Decoder, 114 ... Interface, 115 ... Microcomputer, 501 ... Detection window generation circuit, 502
... AND, 503 ... Judgment circuit, 601 ... Window generation circuit 1, 602 ... Window generation circuit 2, 701 ... Changeover switch, 702 ... Changeover switch

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takehiko Sekine             292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa             Ceremony company Hitachi Image Information System F term (reference) 5D044 CC04 DE02 FG18 GM03 GM12                 5D090 AA01 BB04 CC01 CC05 CC14                       CC16 EE01 EE16 FF33 GG03                       HH01 LL08

Claims (7)

[Claims] 1. An on-disk recording medium in which data is recorded on a track, the track forming a frame of wobbles wobbled at a predetermined frequency and the wobbles of m (m: natural number) period, Pre-pit A, which has a predetermined phase relationship with wobbles and has different (n: natural number) pre-pits for each frame, and is placed at a predetermined position on the frame, and data at a predetermined position on the frame. In a disc recording / reproducing apparatus for recording / reproducing data on / from a disc medium constituted by pre-pits B arranged and arranged by the above, a means for extracting a wobble signal on the disc, a means for extracting a pre-pit signal, Means for generating a clock signal for recording by the extracted wobble signal, and satisfying a specific condition from the extracted prepit signal. A prepit selection means for selecting and outputting only the prepit signal to be added and a means for adjusting the phase of the generated clock signal by the prepit signal are provided, and as a signal for adjusting the phase of the clock signal, a predetermined signal on the frame is provided. A disc recording / reproducing apparatus characterized by selecting only pre-pit A signals arranged at positions. 2. The disc recording / reproducing apparatus according to claim 1, wherein the prepit selecting means is a prepit between each frame.
A disc recording / reproducing apparatus, which selects and outputs when an A signal has a specific period. 3. The disc recording / reproducing apparatus according to claim 1, wherein the pre-pit selection means has means for generating a detection window at a frame period with reference to the first detected pre-pit A signal, When the number of times is detected, the detection window is fixed and the input pre-pit signal is output as the selected pre-pit signal, and when the number of times is not detected a predetermined number of times, the detection window is released and the window generation standard is changed again. Disk recording / playback device. 4. An on-disk recording medium in which data is recorded on a track, the track forming a frame of wobbles wobbled at a predetermined frequency and the wobble of m (m: natural number) period, Pre-pit A, which has a predetermined phase relationship with wobbles and has different (n: natural number) pre-pits for each frame, and is placed at a predetermined position on the frame, and data at a predetermined position on the frame. In a disc recording / reproducing apparatus for recording / reproducing data on / from a disc medium constituted by pre-pits B arranged and arranged by the above, a means for extracting a wobble signal on the disc, a means for extracting a pre-pit signal, Means for generating a clock signal for recording by the extracted wobble signal, and satisfying a specific condition from the extracted prepit signal. Pre-pit selection means for selecting and outputting only the pre-pit signal to be added, means for adjusting the phase of the generated clock signal by the pre-pit signal, and all pre-pit signals based on the selected pre-pit signal output from the pre-pit selection means. It has means for detecting and generating synchronization information and address information, and means for encoding the data input from the outside according to a specific format, and the address information generated by the means for generating the address information is added to the address information. A disc recording / reproducing apparatus for recording the data encoded by the encoding means on the disc based on the above. 5. An on-disk recording medium in which data is recorded on a track, the track forming a frame of wobbles wobbled at a predetermined frequency and the wobbles of m (m: natural number) period, Pre-pit A, which has a predetermined phase relationship with wobbles and has different (n: natural number) pre-pits for each frame, and is placed at a predetermined position on the frame, and data at a predetermined position on the frame. In a disc recording / reproducing apparatus for recording / reproducing data on / from a disc medium constituted by pre-pits B arranged and arranged by the above, a means for extracting a wobble signal on the disc, a means for extracting a pre-pit signal, Means for generating a clock signal for recording by the extracted wobble signal, and satisfying a specific condition from the extracted prepit signal. Pre-pit selection means for selecting and outputting only the pre-pit signal to be added, means for adjusting the phase of the generated clock signal by the pre-pit signal, and all pre-pit signals based on the selected pre-pit signal output from the pre-pit selection means. It has means for detecting and generating synchronization information and address information, and means for encoding the data input from the outside according to a specific format, and the address information generated by the means for generating the address information is added to the address information. A disc recording / reproducing method characterized in that the data encoded by the encoding means is recorded on the disc based on the above. 6. An on-disk recording medium in which data is recorded on a track, the track forming a frame of wobbles wobbled at a predetermined frequency and the wobbles of m (m: natural number) period, Pre-pit A, which has a predetermined phase relationship with wobbles and has different (n: natural number) pre-pits for each frame, and is placed at a predetermined position on the frame, and data at a predetermined position on the frame. In a disc recording / reproducing apparatus for recording / reproducing data on / from a disc medium constituted by pre-pits B arranged and arranged by the above, a means for extracting a wobble signal on the disc, a means for extracting a pre-pit signal, Means for generating a clock signal for recording by the extracted wobble signal, and satisfying a specific condition from the extracted prepit signal. The pre-pit selection means for selecting and outputting only the pre-pit signal to be output, and means for adjusting the phase of the generated clock signal by the pre-pit signal, the pre-pit selection means is based on the pre-pit A signal detected first. It has a means for generating a detection window at a frame period and a means for generating a detection window from the phase relationship by the wobble signal, and adjusts the phase of the clock signal using the selected prepit signal obtained by the two generation windows. A disc recording / reproducing apparatus characterized by: 7. An on-disk recording medium in which data is recorded on a track, the track forming a frame of wobbles wobbled at a predetermined frequency and the wobble of m (m: natural number) period, Pre-pit A, which has a predetermined phase relationship with wobbles and has different (n: natural number) pre-pits for each frame, and is placed at a predetermined position on the frame, and data at a predetermined position on the frame. In a disc recording / reproducing apparatus for recording / reproducing data on / from a disc medium constituted by pre-pits B arranged and arranged by the above, a means for extracting a wobble signal on the disc, a means for extracting a pre-pit signal, Means for generating a clock signal for recording by the extracted wobble signal, and satisfying a specific condition from the extracted prepit signal. The pre-pit selection means for selecting and outputting only the pre-pit signal to be output, and means for adjusting the phase of the generated clock signal by the pre-pit signal, the pre-pit selection means is based on the pre-pit A signal detected first. A detection window is generated in a frame cycle, a detection window is generated from the phase relationship based on the wobble signal, and the output of each generation window is switched. The generation window is generated according to the state of the disc. A disc recording / reproducing apparatus, wherein the phase of the clock signal is adjusted by using a selected pre-pit signal obtained by switching the combination.