JP2006318617A - Reference clock generating circuit and recording medium recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly compensate for slippage of the ultimate position of data recorded on an optical disk. <P>SOLUTION: A first recorded position reference signal is generated from a recorded position reference information formed on a recording medium, and a second recorded position reference signal is generated based on a synchronous signal included in recording data recorded on the recording medium. Then, a recorded area where the data are recorded on the recording medium is discriminated from an unrecorded area where the data are not recorded, and in the recorded area, the second recorded position reference signal is selected and output to a PLL circuit, and in the unrecorded area, the first recorded position reference signal is selected and output to the PLL circuit, and a reference clock for recording is generated by the PLL circuit. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for generating a reference clock. More specifically, the present invention relates to a technique for generating a reference clock for writing data to a storage medium in a recording medium recording apparatus.

  2. Description of the Related Art Conventionally, optical disc recording / reproducing apparatuses for recording information on optical discs such as so-called CDs (Compact discs) and DVDs (Digital Video / Versatile Discs) and reproducing data recorded on these optical discs are known. Yes.

  When information is recorded on these optical discs, address information is formed in advance on the optical disc so that data can be recorded at a predetermined position on the optical disc.

  For example, as shown in FIG. 18, a groove track for writing information and a land pre-pit (Land-Pre-Pit) as address information are provided on the recording surface of an optical disc conforming to the DVD-R / RW standard. A preformatted land track is spirally formed. The optical disc recording / reproducing apparatus records and reproduces information while discriminating the position on the groove track by detecting a land pre-pit (hereinafter referred to as “LPP”) by an optical pickup.

  Further, as shown in FIG. 19, the address information is preformatted as ADIP (Address In Pre-groove) embedded in the wobble and written on the recording surface of the optical disc conforming to the DVD + R / RW standard. A possible groove track and a land track located between the groove tracks are formed in a spiral shape.

  That is, in DVD + R / RW, the side wall of the groove track is wobbling (meandering) corresponding to the address information, and the optical disc recording / reproducing apparatus detects the wobbling information by the optical pickup, thereby detecting the position on the groove track. Information is recorded and reproduced.

  As described above, the optical disc recording / reproducing apparatus detects the address information preformatted on the optical disc, thereby specifying the position of the optical disc where the information is to be recorded, and recording the information on the optical disc.

  By the way, when the state of the optical disc to be recorded is poor, for example, when the scratch on the optical disc recording surface or the preformatted state of the address information is poor, data is recorded at the position defined in the above-mentioned standard. It may not end.

  Such a phenomenon also occurs when a physical shock occurs in the optical disc recording / reproducing apparatus immediately before the end of recording on the optical disc, and the recording clock generated by the PLL circuit in the apparatus shifts.

  In addition, in the section where data is already recorded on the optical disk, that is, there is a recording bit, the reading accuracy of the address information (wobble signal or LPP signal) deteriorates due to interference with the recording bit, and the recording generated from this address information. It is also caused by the deterioration of the clock accuracy.

  When the deviation of the data end position occurs as described above, the following problem arises in relation to the data stored in the optical disk next time.

  That is, as shown in FIG. 20 (a), when the previous recording position of data 1 is reached without going to the position where it should be originally stored on the optical disk, this data 1 and the data recorded next are recorded. An area in which nothing is recorded is generated between the two. If such an area occurs, the bit synchronization process, the frame synchronization process, and the like are affected, and the data 2 may not be reproduced favorably from the optical disc.

  Also, as shown in FIG. 20B, when data 1 is stored out of the position that should be originally stored on the optical disc, a part of the latter half of the recorded data 1 is recorded next. Data 2 may be overwritten, and data 1 may be partially lost.

  Therefore, a method has been proposed in which a synchronization signal is extracted from data already recorded on the groove track of the optical disc, and the timing of data to be newly recorded is adjusted by this synchronization signal (see, for example, Patent Document 1).

  According to this method, even if the previous recording position of data 1 is reached without going to the position where it should be originally stored on the optical disk, the position where it should be stored on the optical disk is protruded. Even if data 1 is stored, the next data can be recorded continuously at the final position of the already recorded data as shown in FIG. It is possible to avoid problems such as influence and overwriting.

  As another method, a detecting means for detecting a deviation amount between a position where data is already recorded and a position where the data should be stored is provided so that the deviation amount is reduced when new data is recorded. A method of adjusting to the above has been proposed (see, for example, Patent Document 2).

  More specifically, before recording new data, the recording clock is controlled in accordance with the reproduction clock generated from the data recorded on the optical disk, and address information ( The recording clock is controlled in accordance with the wobble signal) and the detected shift amount.

According to this method, even if it is the case where the previous position becomes the final recording position of the data without going to the position where it should originally be stored on the optical disc, the next position of the already recorded data is continuously followed. Can be recorded, and continuation of the positional deviation can be avoided.
JP 2000-187947 A JP 2003-30841 A

  However, in the above-mentioned Patent Document 1, the next data is recorded continuously at the final position of the already recorded data, and the final position deviation of the already recorded data remains in the next data, which violates the standard. The state continues.

  In addition, when the recording clock shift occurs, the shift of the final position of the data may be further increased.

  Further, in the above-mentioned Patent Document 2, it is possible to correct the deviation of the final position of the data. However, the deviation amount between the position where the data is already recorded and the position where the data should be stored is detected, and the detected amount Therefore, the recording clock generation sequence becomes complicated and the circuit scale increases.

  Further, since there is a difference in the reference frequency of the recording reference signal (wobble signal or the like) in each optical disc standard, it is necessary to cope with each difference, and lacks versatility.

  The present invention has been made in view of such a problem. Next, means for solving this problem and the effects thereof will be described.

  Therefore, the invention described in claim 1 is included in the first reference signal generation unit that generates the first recording position reference signal from the address information formed on the storage medium, and the recording data recorded on the recording medium. A second reference signal generation unit that generates a second recording position reference signal based on the generated synchronization signal, and selects one of the first recording position reference signal and the second recording position reference signal, and the recording position A reference clock generation circuit having a selection unit that outputs as a reference signal and a PLL circuit that generates a recording reference clock from the recording position reference signal, wherein the selection unit records data on the recording medium. A recorded area and an unrecorded area in which no data is recorded, and a second recording position reference signal is selected and output to the PLL circuit in the recorded area. Select the recording position reference signal and outputs to the PLL circuit.

  The invention according to claim 2 is the invention according to claim 1, further comprising a phase difference measuring unit for measuring a phase difference between the first recording position reference signal and the second recording position reference signal. The second reference signal generation unit adjusts the phase of the second recording position reference signal based on the phase difference measured by the phase difference measurement unit.

  The invention according to claim 3 is the invention according to claim 2, further comprising a calibration signal generator for generating a calibration signal including the recording data signal and the reference position information signal, The second reference signal generator adjusts the phase of the second recording position reference signal when the calibration signal is input.

  According to a fourth aspect of the present invention, there is provided a reading unit for reading recording data recorded on a recording medium and address information formed in advance on the recording medium, and a first recording position reference signal from the reference position information. A first reference signal generation unit for generating; a second reference signal generation unit for generating a second recording position reference signal based on a synchronization signal included in the recording data; a first recording position reference signal; A selection unit that selects any one of the two recording position reference signals and outputs the selected recording position reference signal, a PLL circuit that generates a recording reference clock from the recording position reference signal, and a recording reference clock based on the recording reference clock. And a recording unit for recording data on the recording medium, wherein the selection unit records a recorded area in which data is recorded on the recording medium and data is recorded. In addition to discriminating from the unrecorded area, the second recording position reference signal is selected and output to the PLL circuit in the recorded area, and the first recording position reference signal is selected in the unrecorded area to It outputs to a PLL circuit.

  According to the first aspect of the present invention, the first reference signal generation unit that generates the first recording position reference signal from the address information formed on the storage medium, and the recording data recorded on the recording medium A second reference signal generation unit that generates a second recording position reference signal based on the generated synchronization signal, and selects one of the first recording position reference signal and the second recording position reference signal, and the recording position A reference clock generation circuit having a selection unit that outputs as a reference signal and a PLL circuit that generates a recording reference clock from the recording position reference signal, wherein the selection unit records data on the recording medium. A recorded area and an unrecorded area in which no data is recorded, and a second recording position reference signal is selected and output to the PLL circuit in the recorded area. Since by selecting the recording position reference signal is output to the PLL circuit, it is possible to record data so as to be continuous to the already recorded data, moreover, can also to correct the deviation of the recording end position. Therefore, it is not necessary to have a complicated circuit configuration for detecting the amount of deviation between the position where data is recorded and the position where data should be stored as in the prior art.

  According to the second aspect of the present invention, the second reference signal generation unit includes the phase difference measurement unit that measures the phase difference between the first recording position reference signal and the second recording position reference signal. Adjusts the phase of the second recording position reference signal based on the phase difference measured by the phase difference measuring unit, so that the first recording position reference signal and the second recording position reference signal are The delay difference that occurs is calibrated by the phase difference measurement circuit, so it is possible to design without worrying about individual differences, and the calibration can be performed with a simple configuration. Become.

  According to the invention described in claim 3, the calibration signal generation unit generates a calibration signal including the recording data signal and the reference position information signal, and the second reference signal generation unit includes: Since the phase of the second recording position reference signal is adjusted when the calibration signal is input, it is not necessary to use a calibration optical disk, and this calibration light calibration operation is automatically performed as appropriate. Is possible.

  According to the fourth aspect of the present invention, the reading unit for reading the recording data recorded on the recording medium and the address information previously formed on the recording medium, and the first recording position reference from the reference position information A first reference signal generating unit for generating a signal, a second reference signal generating unit for generating a second recording position reference signal based on a synchronization signal included in the recording data, and a first recording position reference signal And a selection unit that selects one of the second recording position reference signals and outputs it as a recording position reference signal, a PLL circuit that generates a recording reference clock from the recording position reference signal, and the recording reference clock And a recording unit for recording data on the recording medium, wherein the selection unit includes a recorded area in which data is recorded on the recording medium and data In addition to discriminating from the unrecorded area, the second recording position reference signal is selected and output to the PLL circuit in the recorded area, and the first recording position reference signal is selected in the unrecorded area. Since the data is output to the PLL circuit, the data can be recorded so as to be continuous with the already recorded data, and the deviation of the recording end position can be corrected. Therefore, it is not necessary to have a complicated circuit configuration for detecting the amount of deviation between the position where data is recorded and the position where data should be stored as in the prior art.

  Hereinafter, the configuration of the optical disc as the recording medium, the configuration of the optical disc recording device as the optical disc recording apparatus, and the operation thereof will be described in order.

  First, the configuration of the optical disc 1 such as a DVD-R or DVD-RW will be described with reference to FIGS.

  On the recording surface of the optical disc 1, as shown in FIG. 1, a groove track area 101 for writing a recording bit 104 and a land track area 102 pre-formatted with LPP 103 as recording position reference information are formed in a spiral shape. Has been. In the groove track area 101, a wobble 105 as recording position reference information is also formed.

  The optical disc 1 has a plurality of sectors, and the optical disc recording apparatus A performs data recording / reproduction in units of sectors. This sector is composed of 13 rows and 26 synchronization frames.

  Hereinafter, a specific configuration of one sector of the groove area 101 that is a data recordable recording area and the land track area 102 that is an address area having address information and the like will be described.

  FIG. 2 shows the sector structure of the groove track area 101 of the optical disc 1. As shown in FIG. 2, one sector is composed of 13 rows and 26 synchronization frames, and each synchronization frame has a synchronization signal (SYNC signal) arranged at the head thereof and then channel bit data.

  In order to distinguish this synchronization signal from the channel bit data, a recording mark (14T when the clock is 1T) longer than the length of the recording mark appearing in the channel bit data is arranged.

  Next, the sector configuration of the land track area 102 will be described. FIG. 3 is a diagram showing the sector structure of the land track area 102. The sectors of the land track area 102 are arranged so as to correspond to the sectors of the adjacent groove track area 101.

  The sector of the land track area 102 is composed of 13 rows and 26 synchronization frames so as to correspond to the synchronization frame of the groove track area 101.

  One row of two synchronization frames is composed of one synchronization frame (odd number) and one synchronization frame (even number).

  Here, FIG. 4 shows the physical appearance of the groove track area 101 and the land track 102 area of the two synchronization frames. Each synchronization frame is eight wobbles 105 long.

  In addition, a frame synchronization signal (Pre-pit Sync) is arranged in the synchronization frame in the first row, and pre-pit data (Pre-pit data) 0 to 11 are arranged in the synchronization frames in the second row and thereafter. .

  The frame synchronization signal and prepit data 0 to 11 are stored in one of the two synchronization frames in each row.

  Note that both the frame synchronization signal and the pre-pit data are the first three vertices of the wobble 105 of one synchronization frame (the first vertex is “b2”, the second vertex is “b1”, and the third vertex is “b0”). As shown in FIG. 5, the frame synchronization signals (even) and (odd) and the LPP data “0” and “1” are identified depending on the presence or absence of the LPPs b2 to b0. Configured to be able to.

  Prepit data 0 to 3 mean sector addresses (hereinafter referred to as “sector addresses”), and prepit data 4 to 11 refer to error correction code (ECC) block addresses (hereinafter referred to as “block addresses”). Means the data that constitutes.

  Here, the ECC block is composed of sectors 0000b to 1111b (16 sectors), and the block address and its parity A (hereinafter referred to as “ECC error correction code”) are pre-coded for sector addresses 0000b to 0101b. From the pit data 4 to 11, the field ID, the disc information, and the error correction code (Parity B) are composed of the pre-pit data 4 to 11 of the sector addresses 0110b to 1111b, respectively (see FIG. 6).

  Here, for both the frame synchronization signal and the LPP data, the LPP 103 is arranged at the position b2 as shown in FIG.

  FIG. 7 shows the relationship between the LPP signal detected near the position b2 and the synchronization signal.

  In the groove area 101 adjacent to the b2 position of the land track area 102, there is a corresponding sync signal including a relatively long recording mark, and this sync signal includes a 14T recording mark.

(First embodiment)
Next, an optical disk recording apparatus A capable of recording data on the optical disk 1 will be described with reference to FIG. FIG. 8 is a diagram showing blocks related to recording reference clock generation in the optical disc recording apparatus A.

  As shown in FIG. 8, the optical disk recording apparatus A includes an optical pickup 2, an RF signal processing amplification circuit 3, a recording position reference signal processing amplification circuit 4, a reproduction reference clock generation PLL circuit 5, and an RF data series SYNC. A detection circuit 6, a pseudo recording position reference signal generation circuit 7, a selection unit 8, and a recording reference clock generation PLL circuit 9 are provided. The recording position reference signal processing amplification circuit 4, the reproduction reference clock generation PLL circuit 5, the RF data series SYNC detection circuit 6, the pseudo recording position reference signal generation circuit 7, the selection unit 8, and the recording reference clock. The generation PLL circuit 9 constitutes a reference clock generation circuit.

  The optical pickup 2 irradiates the optical disk 1 with an optical laser by an LD (laser diode), which is an optical head, and receives the reflected light by a light receiving element divided into a plurality of regions. And the reflected light received in the several area | region is each converted into an electrical signal. Further, a radial push-pull signal including a wobbling frequency component and an LPP signal component is generated from the difference between the electric signals.

  The RF signal processing amplification circuit 3 extracts an RF (Radio Frequency) signal by adding electrical signals obtained by a plurality of light receiving elements of the optical pickup 2. Thereafter, the RF signal is subjected to amplitude amplification and waveform equalization processing to remove intersymbol interference and convert the signal into a signal in which harmonic components are emphasized. Then, the converted signal is binarized by a slicer composed of a comparator and an integration circuit to generate a data reproduction signal.

  The recording position reference signal processing amplification circuit 4 generates and outputs a wobble signal obtained by extracting and amplifying the wobbling frequency component from the radial push-pull signal output from the optical pickup 2 as a recording position reference signal S6. The recording position reference signal processing amplification circuit 4 corresponds to the first reference signal generator, and the recording position reference signal S6 corresponds to the first recording position reference signal. The wobbling frequency component is extracted by a band pass filter that passes at least 140.64 kHz and its vicinity.

  The reproduction reference clock generation PLL circuit 5 receives the data reproduction signal S2 output from the RF signal processing amplification circuit 3, and the synchronization signal (14T) appearing repeatedly in the data reproduction signal S2 matches the 14 periods of the reproduction clock. Thus, the reproduction clock signal S3 is generated by matching the clock frequency of the PLL circuit.

  The RF data series SYNC detection circuit 6 operates with the reproduction clock signal S3, and outputs an “H” level synchronization detection signal S4 when a synchronization signal is detected in the input data reproduction signal S2. The synchronization signal is detected by detecting data including 14T continuous marks or spaces.

  The pseudo recording position reference signal generation circuit 7 generates a pseudo recording position reference signal (hereinafter referred to as “pseudo recording position reference signal”) S5 from the reproduction clock signal S3 and the synchronization detection signal S4. The pseudo recording position reference signal S5 is a signal that selectively becomes a reference signal of a recording reference clock generation PLL circuit 9 described later. The pseudo recording position reference signal generation circuit 7 corresponds to a second reference signal generation unit, and the pseudo recording position reference signal S5 corresponds to a second recording position reference signal.

  As shown in FIG. 9, the pseudo recording position reference signal generation circuit 7 increments the value of an internal register at the rising edge of the reproduction clock signal S3, and outputs the value of the register as a signal S10. And a decoder 7b for generating a pseudo storage position reference signal from the signal S10 output from the signal S10.

  The counter 7a is a counter that counts from 0 to 185. When the counter 7a counts to 185, the count starts again from 0. In DVD-R and the like, the cycle of 1 wobble (Wobble) is 186T, and by counting from 0 to 185, one cycle is performed in a cycle of 1 wobble.

  The decoder 7b sends an “L” level signal to the internal low-pass filter circuit when the level of the signal S10 from the counter 7a is within the first range, and an “H” level signal when the level is within the second range. This is output and converted into a sine wave by this low-pass filter circuit. The sine wave having one wobble period thus converted is output from the pseudo recording position reference signal generation circuit 7 as a signal S5.

  As shown in FIG. 10, the pseudo recording position reference signal generation circuit 7 generates the signal S10 from the reproduction clock signal S3 extracted from the recorded RF signal, and then converts it into a rectangular wave signal by the decoder 7b. The pseudo recording position reference signal S5 is converted by a low-pass filter circuit. Note that, when the counter 7a is reset by the synchronization detection signal S4, the synchronization accuracy between the reproduction clock signal S3 and the pseudo recording position reference signal S5 is maintained. Further, when the recording position reference signal S6 is processed as a signal binarized by the slicer, the rectangular wave generated by the decoder 7b may be used as the pseudo recording position reference signal S5.

  The selection unit 8 has a function of selecting one of the recording position reference signal S6 and the pseudo recording position reference signal S5 and inputting the selected signal to the recording reference clock generation PLL circuit 9, and includes a signal switching unit 8a and a switching timing. And a generation circuit 8b.

  The signal switching means 8a is a selector circuit that selects one of the recording position reference signal S6 and the pseudo recording position reference signal S5 and inputs it to the recording reference clock generation PLL circuit 9, and outputs it from the switching timing generation circuit 8b. The selection is performed based on the signal S7 to be performed.

  The switching timing generation circuit 8b discriminates a recorded area where data is recorded on the optical disc 1 and an unrecorded area where data is not recorded, and selects the pseudo recording position reference signal S5 in the recorded area. The signal switching unit 8a is controlled, and the signal switching unit 8a is controlled so as to select the recording position reference signal S6 in the unrecorded area.

  That is, when the optical disc recording apparatus A records data on the optical disc 1, the switching timing generation circuit 8b reads the data on the optical disc 1 so that data is already recorded (hereinafter referred to as “recorded area”). .) And the switching timing generation circuit 8b determines the area where data is not recorded (hereinafter referred to as “unrecorded area”) and the position where data recording should start (hereinafter referred to as “recording start”). "Position").

  Then, in the recording operation of the optical disc 1, the pseudo recording position reference signal S5 is selected until data is written on the optical disc 1 (that is, the recorded area). Thereafter, when the data writing position, that is, the recording start position is reached, recording is performed. The position reference signal S6 is selected.

  The recording reference clock generation PLL circuit 9 is a circuit that generates a recording reference clock S9. The recording reference clock generation PLL circuit 9 is used for recording based on the signal S8 selected by the selection unit 8 from the recording position reference signal S6 or the pseudo recording position reference signal S5. A reference clock S9 is generated. The recording reference clock is a clock obtained by multiplying the signal S8 to a frequency 186 times, that is, a 1T clock.

  As shown in FIG. 11, the recording reference clock generation PLL circuit 9 includes a phase comparator 9a that compares the phases of a signal S7 and an output signal from a frequency divider 9d described later, and a phase comparator 9a A loop filter 9b that integrates the differential signal and then passes through a low-pass filter, a voltage-controlled oscillator 9c that generates and outputs a clock corresponding to a control voltage from the loop filter 9b, and a recording signal that is an output signal from the voltage-controlled oscillator 9c And a frequency divider 9d that divides the reference clock S9 by 1/186.

  The operation of the optical disc recording apparatus A configured as described above will be specifically described with reference to the drawings.

  The optical disk recording apparatus A starts an operation for recording data on the optical disk 1 when receiving recording data and a recording command for the data from an external apparatus (not shown).

  When recording data on the optical disc 1, the selection unit 8 detects the recording state of the optical disc 1 and discriminates the recorded area, unrecorded area, and recording start position of the optical disc 1.

  Thereafter, as shown in FIG. 12, the selection unit 8 selects the pseudo recording position reference signal S5 until data is written on the optical disc 1, and then, when the data writing position, that is, the recording start position is reached, the recording position reference is selected. The signal S6 is selected.

  When the selection unit 8 operates in this manner, when the recording start position is before the predetermined position, that is, when the recording of the recorded data is finished earlier, as shown in FIG. After the position reference signal S6 is selected, the recording reference clock generation PLL circuit 9 absorbs the phase difference p between the recording reference clock and the recording position reference signal S6. That is, after the recording position reference signal S6 is selected, there is a phase difference p between the recording reference clock and the recording position reference signal S6, and in order to absorb this, the frequency of the recording reference clock is set to the phase difference. The period is delayed according to p. This makes it possible to correct the recording position deviation.

  The same applies when the recording start position is after the predetermined position, that is, when the recording of the recorded data is late, and the recording position reference signal S6 is selected as shown in FIG. After that, the recording reference clock generation PLL circuit 9 delays the period according to the phase difference between the recording reference clock and the recording position reference signal S6 and absorbs the phase difference.

  As described above, according to the optical disc recording apparatus A in the first embodiment, the reproduction clock signal S3 generated from the RF signal corresponding to the data recorded on the optical disc 1 in the recorded area and the unrecorded area. And the pseudo recording position reference signal S5 generated from the synchronization detection signal S4 and the recording position reference signal S6 generated from the wobble signal extracted from the optical disc 1 are selected, and the reference of the recording reference clock generation PLL circuit 9 is selected. Data can be recorded so as to be continuous with already recorded data simply by inputting it as a clock, and a deviation in the recording end position can also be corrected.

    Therefore, it is not necessary to have a complicated circuit configuration for detecting the amount of deviation between the position where data is recorded and the position where data should be stored as in the prior art.

  In the first embodiment, the synchronization detection signal S4 is used to generate the pseudo recording position reference signal S5. However, LPP may be used. In this case, an LPP detection circuit for detecting LPP is provided, a counter 7a 'operated by an LPP detection signal and a wobble signal is provided instead of the counter 7a, and a decoder 7b' using a wobble signal as a clock instead of the decoder 7b. It can be realized by providing.

  The decoder 7b ′ outputs a signal having eight wobble periods as one period as the pseudo recording position reference signal S5. On the other hand, the recording position reference signal processing amplifying circuit 4 similarly outputs a signal S4 ′ having one period of 8 wobble periods.

  If a circuit for multiplying the output signal of the decoder 7b 'to 8 times the frequency is provided, the recording position reference signal processing amplification circuit 4 may be a circuit that outputs the above-described one wobble period as one period. .

  In the first embodiment, the DVD-R and DVD-RW have been described as the optical disc 1, but it goes without saying that the present invention can also be applied to DVD + R, DVD + RW, and the like.

(Second Embodiment)
Next, the optical disc recording apparatus B in the second embodiment will be described. This optical disk recording apparatus B is an optical disk recording apparatus in which, in addition to the function of the optical disk recording apparatus A, a function for automatically calibrating variations of each component, that is, apparatus variations caused by individual differences is added.

  Hereinafter, the optical disc recording apparatus B will be specifically described with reference to the drawings. FIG. 14 is a diagram showing blocks related to recording reference clock generation in the optical disc recording apparatus B.

  This optical disc recording apparatus B is obtained by adding a phase difference measuring circuit 10 to the optical disc recording apparatus A in the first embodiment and changing the pseudo recording position reference generation circuit accordingly. Other configurations are basically the same as those of the optical disc recording apparatus A, and are therefore given the same reference numerals. Hereinafter, description of the configuration equivalent to that of the optical disc recording apparatus A will be omitted, and the added and changed portions will be specifically described.

  The phase difference measurement circuit 10 measures the phase difference between the pseudo recording position reference signal S5 ′ output from the pseudo recording position reference signal generation circuit 17 and the recording position reference signal S6 output from the recording position reference signal processing amplification circuit 4. Then, the phase difference information signal S 11 as the measurement result is output to the pseudo recording position reference signal generation circuit 17. The phase difference measurement circuit 10 corresponds to a phase difference measurement unit.

  As shown in FIG. 15, the pseudo recording position reference signal generation circuit 17 receives the phase difference information signal S11 from the phase difference measurement circuit 10, and uses the information of the phase difference information signal S11 as offset information. To record. The decoder 18b monitors the phase difference information recorded in the offset information storage unit 11, and is configured to generate a pseudo recording position reference signal S5 ′ according to the phase difference information. This is a portion added from the recording position reference signal processing amplification circuit 4 of one embodiment. Note that the offset information storage unit 11 can be configured by a register.

  Hereinafter, the operation of the optical disc recording apparatus B configured as described above will be described.

  First, a calibration optical disc 1 ′ is inserted into the optical disc recording apparatus B. When the optical disk recording device B receives a calibration command for the recording reference clock generation circuit from the outside via an interface (not shown), the optical disk recording device B drives the optical pickup 2 to read data from the calibration optical disk 1 ′, and the RF signal processing amplification circuit 3 and the recording position reference signal processing amplification circuit 4 are input with the signal S1.

  Thereafter, the reproduction reference clock generation PLL circuit 5 generates the reproduction clock signal S3, and the RF data series SYNC detection circuit 6 outputs the synchronization detection signal S4. Based on the reproduction clock signal S3 and the synchronization detection signal S4, the pseudo recording position reference signal generation circuit 17 generates a pseudo recording position reference signal S5 ′. On the other hand, the recording position reference signal processing amplification circuit 4 outputs a recording position reference signal S6.

  Next, the phase difference measuring circuit 10 measures the phase difference between the pseudo recording position reference signal S5 ′ and the recording position reference signal S6, and outputs the phase difference information signal S11 to the pseudo recording position reference signal generation circuit 17.

  As shown in FIG. 16, when receiving the phase difference information signal S11, the pseudo recording position reference signal generation circuit 17 records this information in the offset information storage unit 11, and according to the phase difference information, the pseudo recording position reference signal S5. ′ Is generated.

  In the second embodiment, the calibration optical disc is written with data so that the delay difference generated between the pseudo recording position reference signal S5 ′ and the recording position reference signal S6 is zero. If the configuration can be configured by the offset information storage unit, the delay difference is not necessarily zero.

  As described above, the delay difference generated between the pseudo recording position reference signal S5 ′ and the recording position reference signal S6 due to the individual difference of each component is caused by the phase difference measuring circuit 10 and the offset information storage unit 11. Since the calibration is performed, the design can be performed without worrying about individual differences, and the calibration can be performed with a simple configuration.

  In the second embodiment, the pseudo recording position reference signal generation circuit 17 adjusts the delay difference generated between the pseudo recording position reference signal S5 ′ and the recording position reference signal S6. The reference signal processing amplification circuit 4 may be provided with an offset information storage unit to correct the delay difference.

(Third embodiment)
Next, an optical disk recording apparatus C according to the third embodiment will be described. This optical disk recording apparatus C is an optical disk recording apparatus provided with a calibration reference signal generation circuit 12 in addition to the functions of the optical disk recording apparatuses A and B.

  Hereinafter, the optical disk recording apparatus C will be specifically described with reference to the drawings. FIG. 17 is a diagram showing blocks related to recording reference clock generation in the optical disc recording apparatus C.

  In this optical disk recording apparatus C, a reference signal generation circuit 12 is added to the optical disk recording apparatus A in the second embodiment, and a second selection unit 13 is added accordingly. Other configurations are basically the same as those of the optical disc recording apparatus B, and are therefore given the same reference numerals. Hereinafter, description of the configuration equivalent to that of the optical disc recording apparatus B will be omitted, and the added and changed portions will be specifically described.

  The reference signal generation circuit 12 is a circuit that generates and outputs a signal equivalent to the signal read by the optical pickup 2 from the calibration optical disc 1 ′ in the second embodiment, and corresponds to a calibration signal generation unit.

  Further, the second selection unit 13 selects one of the signal S1 ′ output from the optical pickup 2 and the signal output from the reference signal generation circuit 12, and performs subsequent RF signal processing amplification. It has a function of outputting to the circuit 3 and the recording position reference signal processing amplification circuit 4.

  Hereinafter, the operation of the optical disc recording apparatus C configured as described above will be described.

  First, when the optical disc recording apparatus C receives a calibration command for the recording reference clock generation circuit from the outside via an interface (not shown), it switches the second selection unit 13 and selects the signal S12 from the reference signal generation circuit 12. To form a path to be output.

  Thereafter, the calibration data signal S12 is output from the reference signal generation circuit 12, and the signal S1 'is input to the RF signal processing amplification circuit 3 and the recording position reference signal processing amplification circuit 4 via the second selection unit 13. .

  Thereafter, the reproduction reference clock generation PLL circuit 5 generates the reproduction clock signal S3, and the RF data series SYNC detection circuit 6 outputs the synchronization detection signal S4. Based on the reproduction clock signal S3 and the synchronization detection signal S4, the pseudo recording position reference signal generation circuit 17 generates a pseudo recording position reference signal S5 ′. On the other hand, the recording position reference signal processing amplification circuit 4 outputs a recording position reference signal S6.

  Next, the phase difference measuring circuit 10 measures the phase difference between the pseudo recording position reference signal S5 ′ and the recording position reference signal S6, and outputs the phase difference information signal S11 to the pseudo recording position reference signal generation circuit 17.

  When receiving the phase difference information signal S11, the pseudo recording position reference signal generation circuit 17 records this information in the offset information storage unit 11, and generates a pseudo recording position reference signal S5 ′ according to the phase difference information.

  In the third embodiment, the calibration operation is performed only when a calibration command is received from the outside. However, this calibration operation may be performed every time the optical disk recording apparatus C is turned on. Further, the calibration operation may be performed periodically at a predetermined interval.

  As described above, the delay difference generated between the pseudo recording position reference signal S5 and the recording position reference signal S6 due to the individual difference of each component is calibrated by the phase difference measurement circuit 10 and the offset information storage unit 11. As a result, the design can be performed without much concern for individual differences, and the calibration can be performed with a simple configuration. In addition, since it is not necessary to use a calibration optical disc as in the second embodiment, the calibration light calibration operation can be automatically performed as appropriate.

  In the third embodiment, the delay difference generated between the pseudo recording position reference signal S5 and the recording position reference signal S6 is adjusted by the pseudo recording position reference signal generation circuit 17. The delay difference may be corrected by providing an offset information storage unit in the signal processing amplifier circuit 4.

The figure which shows the structure of the recording surface of an optical disk. The figure which shows the sector structure of the groove area | region of an optical disk. The figure which shows the sector structure of the land track area | region of an optical disk. The physical external view of the groove track area | region and land track area | region of 2 synchronous frames. The figure which shows the content of the LPP signal. The figure which shows the content of the LPP signal. The figure which shows the relationship between the LPP signal detected near b2 position, and a synchronizing signal. The figure which shows the structure of the optical disk recording device in 1st Embodiment. The figure which shows the structure of the pseudo | simulation recording position reference signal generation circuit in 1st Embodiment. Explanatory drawing of the optical disk recording device in 1st Embodiment. The figure which shows the structure of the recording reference clock generation PLL circuit. FIG. 3 is an operation explanatory diagram of the optical disc recording apparatus according to the first embodiment. FIG. 3 is an operation explanatory diagram of the optical disc recording apparatus according to the first embodiment. The figure which shows the structure of the optical disk recording device in 2nd Embodiment. The figure which shows the structure of the pseudo recording position reference signal generation circuit in 2nd Embodiment. Operation | movement explanatory drawing of the optical disk recording device in 2nd Embodiment. The figure which shows the structure of the optical disk recording device in 3rd Embodiment. The figure which shows the structure of the recording surface of an optical disk. The figure which shows the structure of the recording surface of an optical disk. The figure which shows the recording state of the optical disk by the conventional optical disk apparatus. The figure which shows the recording state of the optical disk by the conventional optical disk apparatus.

Explanation of symbols

4 Recording Position Reference Signal Generation Circuit 7 Pseudo Recording Position Reference Signal Generation Circuit 8 Selection Unit 9 Recording Reference Clock Generation Circuit 10 Phase Difference Measurement Circuit 11 Reference Signal Generation Circuit

Claims (4)

A first reference signal generator for generating a first recording position reference signal from recording position reference information formed on the storage medium;
A second reference signal generation unit that generates a second recording position reference signal based on a synchronization signal included in the recording data recorded on the recording medium;
A selection unit that selects one of the first recording position reference signal and the second recording position reference signal and outputs the selected signal as a recording position reference signal;
A PLL circuit for generating a recording reference clock from the recording position reference signal;
A reference clock generation circuit having
The selection unit includes:
A recorded area where data is recorded on the recording medium and an unrecorded area where data is not recorded are discriminated, and a second pseudo recording position reference signal is selected and output to the PLL circuit in the recorded area. And a reference clock generation circuit that selects a first recording position reference signal in an unrecorded area and outputs the selected signal to the PLL circuit. A phase difference measuring unit that measures a phase difference between the first recording position reference signal and the second recording position reference signal;
The second reference signal generator is
The reference clock generation circuit according to claim 1, wherein the phase of the second recording position reference signal is adjusted based on the phase difference measured by the phase difference measurement unit. A calibration signal generator for generating a calibration signal including the recording data signal and the reference position information signal;
The second reference signal generator is
3. The reference clock generation circuit according to claim 2, wherein the phase of the second recording position reference signal is adjusted when the calibration signal is input. A reading unit that reads the recording data recorded on the recording medium and the recording position reference information formed in advance on the recording medium;
A first reference signal generation unit that generates a first recording position reference signal from the reference position information;
A second reference signal generation unit that generates a second recording position reference signal based on a synchronization signal included in the recording data;
A selection unit that selects one of the first recording position reference signal and the second recording position reference signal and outputs the selected signal as a recording position reference signal;
A PLL circuit for generating a recording reference clock from the recording position reference signal;
A recording medium reproducing device having a recording unit for recording data on the recording medium based on the recording reference clock,
The selection unit includes:
A recorded area where data is recorded on the recording medium and an unrecorded area where data is not recorded are discriminated, and a second recording position reference signal is selected and output to the PLL circuit in the recorded area. A recording medium recording apparatus for selecting a first recording position reference signal and outputting it to the PLL circuit in an unrecorded area.

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