Abstract:
An information recording method, including detecting a synchronous signal and first address information from a recording medium, on which the synchronous signal and the first address information have been preformatted in a wobbled groove track, which is divided into a first unit with a predetermined length on the wobbled groove track. The method further includes constructing the track into second units, the second unit having a length different from the first unit with the predetermined length, and generating second address information indicating the constructed second units.

Description:
The present application is a divisional of U.S. patent application Ser. No. 11/032,139, filed on Jan. 11, 2005 now U.S. Pat. No. 7,505,382, which is a continuation of U.S. patent application Ser. No. 10/780,710, filed on Feb. 19, 2004 now U.S. Pat. No. 6,873,582, which is a continuation of application Ser. No. 09/852,806 filed on May 11, 2001 now U.S. Pat. No.6,754,148, for which priority is claimed under 35 U.S.C. §120. This application also claims priority under 35 U.S.C. §119(a) on Patent Application No. 25628/2000 filed in Korea on May 13, 2000. The entire contents of each of these applications are herein fully incorporated by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a method for recording information onto a recording medium, and in particular to an information recording method and apparatus which is capable of improving a recording density of an optical recording medium. 
     2. Description of the Prior Art 
     Generally, a CD (Compact Disc) recording and/or reproducing apparatus records and/or reproduces information by irradiating a laser light beam onto an optical recording medium. The optical recording medium can be divided into a reproduction only disc and a recordable disc. 
     Recordable data is recorded on the compact disc as an EFM (Eight to Fourteen Modulation) frame of a 588 channel bit unit. One block including 98-number of EFM frames forms a sub-code frame as a basic unit capable of performing addressing. Herein, the sub-code frame is a minimum unit of time information and includes main channel data of 2352 byte. 
     The CD recording and/or reproducing apparatus performs random-access of information on the basis of a Q-code as a time code format included in the sub-code frame. The CD recording and/or reproducing apparatus such as a CD-R (CD-Recordable), a CD-RW (CD Re-Writable) will now be described with reference to accompanying  FIG. 1 . 
       FIG. 1  is a waveform diagram illustrating an ATIP (Absolute Time In Pre-groove) frame recorded as a wobble signal onto an optical recording medium in accordance with the prior art. 
     As depicted in  FIG. 1 , the CD recording and/or reproducing apparatus in accordance with the prior art records user information onto a wobbled groove track  103  as a pit  102  corresponding to binary information. A wobbled land track  101  is formed between the wobbled groove tracks. A wobble signal is preformatted on the both sides of wobbled groove track  103  with a certain cycle, the wobble signal controls a rotation velocity of a spindle motor (not shown) and is used as a reference signal generating a recording channel clock signal. In addition, ATIP (Absolute Time In Pre-groove) information capable of performing a physical addressing can be recorded by converting the wobble signal preformatted on the both sides of the wobbled groove track  103  into a carrier signal. Herein, a basic unit of the recorded ATIP information is an ATIP frame, one ATIP frame corresponds to a 294-wobble cycle of the wobble signal recorded on the both sides of wobbled groove track  103 . A frame synchronous signal (Synch) is recorded on a start position of the ATIP frame, ID (IDentifier) information and a CRC (Cyclic Redundancy Check) code as an ECC (Error Correction Code) are recorded in the ATIP frame. 
     The frame synchronous signal (Synch) is recorded from a frame start to a 28-wobble cycle in the total 294 wobble cycle of the ATIP frames, the ID code and ECC are recorded on the rest of the wobble cycle. Herein, the ID code is a time code described as minute (MM):second (SS):frame(FF), and the time code is time information of a sub-code frame. 
     Meanwhile, in recording of user information, a sub-code frame is recorded so as to correspond to a preformatted ATIP frame one-to-one. One sub-code frame includes 588×98 number of channel bits. In addition, in recording of user information, the sub-code frame requires a write channel clock signal corresponding to 196-times of a 294 wobble cycle of the ATIP frame in order to perform sampling of recordable data. Hereinafter, an ATIP (Absolute Time In Pre-groove) information pre-format apparatus will now be described with reference to accompanying  FIG. 2 . 
       FIG. 2  is a block diagram illustrating the ATIP information pre-format apparatus in accordance with the prior art. 
     As depicted in  FIG. 2 , the ATIP (Absolute Time In Pre-groove) information pre-format apparatus in accordance with the prior art includes a clock generator  201  generating a clock signal of 44.1 kHz, a second frequency divider  202  outputting a carrier signal by being inputted the clock signal of 44.1 kHz, a first frequency divider  204  generating a bi-phase clock signal (PLCK) by being inputted the clock signal of 44.1 kHz, a bi-phase modulator  205  generating a DPS (Dual Phase Signal) by converting a channel bit stream (PCHB) from an input line  206  by the bi-phase clock signal (PCLK), and a frequency modulator  203  being inputted the carrier signal and DPS (Dual Phase Signal), frequency-modulating the DPS and outputting it. Herein, the channel bit stream (PCHB) is generated by channel-coding the ATIP information, it includes an ATIP frame synchronous signal (Synch), an ATIP ID (IDentification) code and an ECC (Error Correction Code). The ATIP ID code includes address information indicating a physical position of an optical disc and additional disc management information. Hereinafter, the operation of the ATIP pre-format apparatus in accordance with the prior art will now be described. 
     First, the second frequency divider  202  generates a carrier signal (fc) of 22.05 kHz by dividing a clock signal of 44.1 kHz by 2. 
     The first frequency divider  204  generates a bi-phase clock signal (PCLK) of 6.3 kHz by dividing the clock signal of 44.1 kHz from the clock generator  201  by 7. 
     The bi-phase modulator  205  generates a DPS (Dual Phase Signal) by converting the channel bit stream (PCHB) from the input line  206  with the bi-phase clock signal (PCLK). Herein, the DPS is frequency-converted by the frequency modulator  203  and is outputted through an output line  207 . Accordingly, a wobble signal preformatted on the optical recording medium is FM-converted in a range of ±1 kHz in a center frequency of 22.05 kHz. Hereinafter, the CD recording and/or reproducing apparatus in accordance with the prior art will now be described with reference to accompanying  FIG. 3 . 
       FIG. 3  is a block diagram illustrating the CD recording and/or reproducing apparatus in accordance with the prior art. 
     As depicted in  FIG. 3 , a reproduction processing unit of the CD recording and/or reproducing apparatus in accordance with the prior art includes an optical pickup  301  outputting a push-pull signal, a RF (Radio Frequency) signal processing unit  302  generating a high frequency signal by signal-processing the push-pull signal, a demodulation/sub-code detecting unit  303  generating reproduction data by being inputted the high frequency signal, and a CIRC (Cross Interleaved Reed-Solomon) decoder  304  correcting errors of the reproduction data by a EFM (Eight to Fourteen Modulation) frame and outputting it. Hereinafter, the operation of the reproduction processing unit of the CD recording and/or reproducing apparatus in accordance with the prior art will now be described. 
     First, the RF signal processing unit  302  generates a high frequency signal by signal-processing the push-pull signal outputted from the optical pickup  301 . 
     The demodulation/sub-code detecting unit  303  generates reproduction data by amplifying, equalizing and demodulating the high frequency signal from the RF signal processing unit  302 . 
     The CIRC decoder  304  corrects errors of the reproduction data by the EFM frame. 
     In the meantime, a record processing unit of a recordable CD recording and/or reproducing apparatus in accordance with the prior art includes an optical pickup  301  outputting a push-pull signal, a wobble signal detecting unit  308  detecting a wobble signal by passing the push-pull signal through a carrier signal bandwidth, an ATIP (Absolute Time In Pre-groove) decoder  309  restoring ATIP (Absolute Time In Pre-groove) information as a physical address by using the wobble signal and generating a flag signal (ID-FLAG), a CIRC encoder  307  inserting an error correction code into inputted recordable data, a modulation/sub-code inserting unit  306  modulating the recordable data into an EFM (Eight to Fourteen Modulation) frame by sampling it with a write channel clock signal (WRT-CLK) and inserting an inputted sub-code into the EFM frame, a laser power controller  305  controlling a laser diode of the optical pickup  301  in accordance with a record channel signal from the modulation/sub-code inserting unit  306 , and a microcomputer  310  generating a record start signal (WRT-ON) by synchronizing with the flag signal (ID-FLAG) from the ATIP decoder  309  and generating a sub-code by using an ID code. Hereinafter, the operation of the recordable CD recording and/or reproducing apparatus in accordance with the prior art will now be described. 
     First, the wobble signal detecting unit  308  detects a wobble signal by bandwidth-passing a push-pull signal outputted form the optical pickup  121  through a carrier signal bandwidth of 22.05 kHz. In more detail, as depicted in  FIG. 4 , the wobble signal detecting unit  308  is constructed with a BPF (Band Pass Filter)  401  and detects the wobble signal by bandwidth-passing the push-pull signal outputted form the optical pickup  301  through the carrier signal bandwidth of 22.05 kHz. 
     The ATIP decoder  309  restores ATIP information as a physical address by using the wobble signal form the wobble signal detecting unit  308 . The ATIP decoder  309  generates an ID (IDentification) code as time information of minute:second:frame, an ID code error discrimination signal (ID-OK) indicating an error of the ID code, and a flag signal (ID-FLAG) in detecting of ATIP frame synchronous signal (Synch). In addition, the ATIP decoder  309  generates a write channel clock signal (WRT-CLK) for sampling recordable data. Hereinafter, the construction of the ATIP decoder  309  will now be described in detail with reference to accompanying  FIG. 4 . 
       FIG. 4  is a detailed block diagram illustrating the ATIP decoder  309  as shown at  FIG. 3 . 
     As depicted in  FIG. 4 , the ATIP decoder  309  includes a slicer  402  being inputted the wobble signal, a PLL (Phase Lock Loop) generating a write channel clock signal (WRT-CLK) by contacting to an output end of the slicer  402 , a frequency demodulator  405  frequency-demodulating an output signal of the slicer  402 , a bi-phase channel demodulator  407  restoring an output signal of the frequency demodulator  405  as bi-phase channel data, a decoder &amp; latch  408  decoding an ID code of the bi-phase channel data, and a synchronous signal detecting unit  406  detecting a frame synchronous (Synch) signal from an output signal of the frequency demodulator  405 . Herein, the PLL includes a phase comparator &amp; LPF (Low Pass Filter)  403  contacted to the output end of the slicer  402 , a VCO (Voltage Control Oscillator)  404  contacted to the phase comparator &amp; LPF  403  so as to form a closed-loop, a fourth frequency divider  410  lowering a frequency of the write channel clock signal (WRT-CLK) by dividing the write channel clock signal (WRT-CLK) by 98, a third frequency divider  409  dividing an output signal of the fourth frequency divider  410  by 2, a fifth frequency divider  411  dividing an output signal of the third frequency divider  410  by 7, and a sixth frequency divider  412  dividing an output signal of the fifth frequency divider  411  by 2 and outputting it. The operation of the ATIP decoder  309  in accordance with the prior art will now be described with reference to accompanying  FIGS. 3 and 4 . 
     First, the slicer  402  generates a carrier signal by slicing a wobble signal outputted from the BPF (Band Pass Filter)  401  with a certain slice level. 
     The phase comparator &amp; LPF  403  compares a phase of the carrier signal outputted form the slicer  402  with a phase of an output signal of the second frequency divider  409  and generates a control signal corresponding to the phase difference. 
     The VCO  404  generates the write channel clock signal (WRT-CLK) by varying a frequency of an oscillation frequency in accordance with the control signal outputted from the phase comparator &amp; LPF  403 . Herein, the write channel clock signal (WRT-CLK) is maintained as 4.3218 MHz 196-times increased from the carrier signal (fc=22.05 kHz) of the wobble signal. 
     The fourth frequency divider  410  lowers a frequency of the write channel clock signal (WRT-CLK) as 44.1 kHz by dividing the write channel clock signal (WRT-CLK) by 98. In addition, the output signal of the fourth frequency divider  410  is inputted to the phase comparator &amp; LPF  403  as a frequency of 22.05 kHz after being divided by 2 by the third frequency divider  409  and is restored as a bi-phase clock signal (PCLK) of 6.3 kHz by being divided by 7 by the fifth frequency divider  411 . 
     The frequency demodulator  405  demodulates the ATIP information by sampling a carrier signal outputted form the slicer  402  in accordance with the write channel clock signal (WRT-CLK). 
     The synchronous signal detecting unit  406  detects a frame synchronous signal (Synch) in an output signal of the frequency demodulator  405 . The frame synchronous signal (Synch) detected from the synchronous signal detecting unit  406  is outputted to the decoder &amp; latch  408 , and is outputted to the microcomputer  310  as a flag signal (ID FLAG) indicating a start of the ATIP frame. 
     The bi-phase demodulator  407  demodulates the bi-phase signal by the bi-phase clock signal (PCLK) inputted from the fifth frequency divider  411  and provides it to the decoder &amp; latch  408 . 
     The decoder &amp; latch  408  restores an ID code from a data channel clock signal (DCLK) that the bi-phase clock signal (PCLK) is divided by 2 and a channel bit stream outputted from the bi-phase demodulator  407  by the frame synchronous signal (Synch), and performs an error correction about the ID code. The ID code detected by the decoder &amp; latch  408  and flag signal (ID FLAG) indicating the error correction are outputted to the microcomputer  310 . 
     The microcomputer  310  generates a record start signal (WRT-ON) by synchronizing with the flag signal (ID FLAG) from the ATIP decoder  309  and generates a sub-code by using the ID code. 
     The CIRC encoder  307  inserts an error correction code into the inputted recordable data. The modulation/sub-code inserting unit  306  modulates the recordable data from the CIRC encoder  307  into an EFM code by sampling it with the write channel clock signal (WRT-CLK) and inserts the sub-code outputted from the microcomputer  310  into an EFM frame. 
     The laser power controller  305  controls a laser diode of the optical pickup  310  in accordance with a record channel signal from the modulation/sub-code inserting unit  306 . 
     In recording of user information, the microcomputer  310  generates the record start signal (WRT-ON) by detecting a record start position (MM:SS:FF (START)) of an ATIP frame preformatted on the optical disc in the ID code described as minute:second:frame time information. The modulation/sub-code inserting unit  306  generates a record channel signal by synchronizing with a frame synchronous signal, namely, a flag signal (ID FLAG) starting an ATIP (Absolute Time In Pre-groove) frame. 
     In the meantime, when a record end position (MM:SS:FF (END)) is detected, the microcomputer  310  cuts off the record start signal (WRT-ON). Herein, the modulation/sub-code inserting unit  306  ends the record channel signal generation by synchronizing with the flag signal (ID FLAG). 
     As described above, in a recordable optical recording medium such as a CD-R (Compact Disc-Recordable), a CD-RW (Compact Disc Re-Writable), a sub-code frame including user information is recorded so as to correspond one-to-one to an ATIP frame preformatted onto an optical disc. Accordingly, a physical length of sub-code frame is equal to a physical length of an ATIP frame. And, main channel data as the user information is recorded as 2352 byte per one ATIP frame (Absolute Time In Pre-groove). 
       FIG. 5  is a waveform diagram illustrating input/output of the record processing unit of the CD recording and/or reproducing apparatus as shown at  FIG. 3 . In more detail,  FIG. 5  illustrates an input/output of a flag signal (ID FLAG), an ID code error discrimination signal (ID-OK) indicating an error of an ID code, an ID code described as time information of minute:second:frame, a record start signal (WRT-ON), and a write signal recording user information. 
     Recently, a recording density of an optical recording medium has been improved in accordance with a development of a blue laser and increase of a diameter of an object lens. However, information has to be recorded by corresponding one-to-one to a physical length of an ATIP frame preformatted onto an optical disc by a unit sub-code frame, accordingly it is difficult to improve a recording density more. 
     In the meantime, in an information recording method and apparatus of a Korea patent No. 0253805, a technique varying a length of a unit record region by generating a logical address different from a physical address preformatted onto an optical disc is represented. However, in the represented recording method, a write channel clock signal which has to vary in accordance with a variable length of unit record regions is not provided accurately. 
     As described above, the information recording apparatus in accordance with the prior art has to record information so as to correspond one-to-one to a physical length of an ATIP (Absolute Time In Pre-groove) frame preformatted onto an optical disc by a unit sub-code frame, accordingly it is difficult to improve a recording density. 
     In addition, the information recording apparatus in accordance with the prior art can not provide accurately a write channel clock signal so as to vary in accordance with a variable length of a unit record region. 
     SUMMARY OF THE INVENTION 
     Accordingly, an object of the present invention is to provide an information recording method and apparatus which is capable of improving a recording density of an optical recording medium. 
     Another object of the present invention is to provide an information recording method and apparatus which is capable of providing logical address information varying efficiently in accordance with variation of recording density in unit record regions. 
     Still another object of the present invention is to provide an information recording method and apparatus which is capable of providing a write channel clock signal varying adaptively in accordance with variable unit record regions. 
     In order to achieve the objects of the present invention, there is provided an information recording method in accordance with the present invention including detecting a carrier signal in an optical recording medium preformatted as first unit regions by modulating a synchronous signal dividing a track into first unit regions having a certain volume and address information indicating the first unit regions as time information format, restoring the address information by the detected carrier signal, converting the restored address information into a linear code, generating logical address information indicating second unit regions by counting the linear code with a clock signal varied in accordance with a volume of second unit regions different from the volume of first unit regions, generating a record clock signal varied in accordance with a recording density of the second unit regions, and recording user information onto the optical recording medium so as to correspond to the second unit regions by synchronizing with the record clock signal. 
     In order to achieve the objects of the present invention, there is provided an information recording apparatus in accordance with the present invention including a carrier signal detecting means for detecting a carrier signal in an optical recording medium preformatted as first unit regions by modulating a synchronous signal dividing a track into first unit regions having a certain volume and address information indicating the first unit regions as time information format, a decoding means for restoring the address information by the detected carrier signal, a linear code converting means for converting the restored address information into a linear code, an address generating means for generating logical address information indicating the second unit regions by counting the linear code with a clock signal varied in accordance with a volume of the second unit regions different from the volume of the first unit regions, a record clock signal generating means for generating a record clock signal varied in accordance with a recording density of the second unit regions, and an information recording means for recording user information onto the optical recording medium so as to correspond to the second unit regions by synchronizing with the record clock signal. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a waveform diagram illustrating an ATIP (Absolute Time In Pre-groove) frame recorded as a wobble signal onto an optical recording medium in accordance with the prior art. 
         FIG. 2  is a block diagram illustrating an ATIP (Absolute Time In Pre-groove) information pre-format apparatus in accordance with the prior art. 
         FIG. 3  is a block diagram illustrating a CD recording and/or reproducing apparatus in accordance with the prior art. 
         FIG. 4  is a detailed block diagram illustrating an ATIP decoder as shown at  FIG. 3 . 
         FIG. 5  is a waveform diagram illustrating an input/output of a record processing unit of the CD recording and/or reproducing apparatus as shown at  FIG. 3 . 
         FIG. 6  is a flow chart illustrating an information recording method in accordance with the present invention. 
         FIG. 7  is a block diagram illustrating an information recording apparatus in accordance with the present invention. 
         FIG. 8  is a detailed block diagram illustrating an ATIP decoder as shown at  FIG. 7 . 
         FIG. 9  is a detailed block diagram illustrating a latch unit as shown at  FIG. 8 . 
         FIG. 10  is a waveform diagram illustrating an input/output of a record processing unit of the information recording/reproducing apparatus as shown at  FIGS. 7˜9 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Hereinafter, an information recording method and apparatus in accordance with the preferred embodiment of the present invention will now be described with reference to accompanying  FIGS. 6˜10 . 
       FIG. 6  is a flow chart illustrating an information recording method in accordance with the present invention. 
     First, a carrier signal (fc) of ATIP (Absolute Time In Pre-groove) information preformatted onto an optical recording medium is detected as shown at ST 61 . Herein, the ATIP information is displayed and preformatted onto the optical recording medium as time information. 
     The ATIP information is restored by frequency-demodulating the detected carrier signal (fc) and bi-phase-demodulating it as shown at S 62 . The restored ATIP information includes a synchronous signal (Synch), an ID code and an error correction code by a certain frame (data sector) unit. Herein, the ID code passes an error correction procedure in a demodulating process of the ATIP information. 
     After that, a write channel clock signal (CWRT-CLK) is generated so as to be appropriate to a recording density of a sub-code frame to be recorded as shown at S 63 . In addition, an ID code (LID) of the restored ATIP information is converted into a linear code and a physical length of the linear code is adjusted in accordance with an adjustment rate m/R of the recording density as shown at S 64 . Herein, the m and R are integers not greater than 0. And, a logical address signal indicating to record user information as a length different from the physical length of ATIP frame is generated by converting the adjusted linear code into a time code as shown at S 65 . Herein, the ATIP frame means a basic unit for recording the ATIP information. 
     By recording the user information onto the optical recording medium in accordance with the logical address signal as shown at S 66 , the user information is recorded onto the optical recording medium with a length different from the physical address length preformatted onto the optical recording medium. The information recording apparatus by above-described information recording method will now be described in detail with reference to accompanying  FIG. 7 . 
       FIG. 7  is a block diagram illustrating an information recording apparatus in accordance with the present invention. 
     As depicted in  FIG. 7 , a reproduction processing unit of the information recording apparatus includes an optical pickup  701  outputting a push-pull signal, a RF (Radio Frequency) signal processing unit  702  serial-contacted to an output end of the optical pickup  701  and generating a high frequency signal by being inputted the push-pull signal, a demodulation/sub-code detecting unit  703  generating reproduction data by being inputted the high frequency signal, and a CIRC (Cross Interleaved Reed-Solomon) decoder  704  correcting an error of the reproduction data by an EFM (Eight to Fourteen Modulation) frame. The operation of the reproduction processing unit of the information recording apparatus in accordance with the present invention will now be described in detail. 
     First, the RF signal processing unit  702  generates a high frequency signal by signal-processing the push-pull signal outputted from the optical pickup  701 , the demodulation/sub-code detecting unit  703  generates reproduction data by demodulating the signal after amplifying and equalizing. The CIRC decoder  704  corrects an error of the reproduction data by the EFM frame (Eight to Fourteen Modulation). 
     In the meantime, as depicted in  FIG. 7 , a record processing unit of the information recording apparatus in accordance with the present invention includes the optical pickup unit  701  outputting the push-pull signal, a wobble signal detecting unit  705  detecting a wobble signal by bandwidth-passing the push-pull signal through a carrier signal bandwidth of 22.05 kHz, an ATIP (Absolute Time In Pre-groove) decoder  706  restoring ATIP (Absolute Time In Pre-groove) information as a physical address by using the wobble signal, generating a flag signal (LID-flag) indicating a start position of an ID code of the restored ATIP information and generating a write channel clock signal (CWRT-CLK) adaptable to a present recording density, a CIRC (Cross Interleaved Reed-Solomon) encoder  709  inserting an error correction code by being inputted the user information (recordable data), a modulation/sub-code inserting unit  708  modulating the recordable data outputted from the CIRC encoder  709  into an EFM code by sampling the recordable data with the write channel clock signal (CWRT-CLK) and inserting a sub-code into the EFM frame, a laser power controller  707  controlling a laser diode of the optical pickup  701  in accordance with the write channel clock signal (CWRT-CLK) from the modulation/sub-code inserting unit  708 , and a microcomputer  710  generating a record start signal (LWRT-ON) by synchronizing with the flag signal (LID-FLAG) from the ATIP decoder  706  and generating the sub-code by using an ID code (LID). Herein, construction of the ATIP decoder  706  will now be described in detail with reference to accompanying  FIG. 8 . 
       FIG. 8  is a detailed block diagram illustrating the ATIP decoder as shown at  FIG. 7 . 
     As depicted in  FIG. 8 , the ATIP decoder  706  includes a slicer  802  being inputted the wobble signal, a PLL (Phase Lock Loop) contacted to an output end of the slicer  802  and generating the write channel clock signal (CWRT-CLK), a frequency demodulator  807  frequency-demodulating the wobble signal from the slicer  802 , a bi-phase channel demodulator  809  restoring an output signal from the frequency demodulator  807  as bi-phase channel data, a decoder &amp; latch  810  decoding an ID code (CID) from the bi-phase channel data, a synchronous signal detecting unit  808  detecting a frame synchronous signal (Synch) in an output signal from the frequency demodulator  807 , an AND gate  813  outputting a logical signal in accordance with the ID code (CID) and frame synchronous signal (Synch), a first multiplier  811 , a first adder  812 , a second multiplier  814  and a second adder  819  converting the ID code (CID) outputted from the decoder &amp; latch  810  into a linear code, a third multiplier  820  and a counter  821  adjusting a physical length of the converted linear code in accordance with a preset recording density adjustment ratio m/R, a first divider  822  dividing an output value of the counter  821  by a certain value “R”, a latch unit  823  contacted to the first divider  822  and converting the linear code into a time code adaptable to an optical recording medium, a flip-flop  818  generating an ID code error discrimination signal (LID-OK) by being inputted an output value from the first divider  822  and a reset signal (LID FLAG-RST) from the microcomputer  710 . Herein, the PLL includes a phase comparator &amp; LPF  803  contacted to an output end of the slicer  802 , a VCO (Voltage Control Oscillator)  804  contacted to the phase comparator &amp; LPF  803  so as to form a closed-loop, an eighth frequency divider  806  converting a frequency by dividing the write channel clock signal (CWRT-CLK) by n×m, and a seventh frequency divider  805  dividing an output signal of the eighth divider  806  by 2. In addition, the construction of the latch unit  823  will now be described in detail with reference to accompanying  FIG. 9 . 
       FIG. 9  is a detailed block diagram illustrating the latch unit as shown at  FIG. 8 . 
     As depicted in  FIG. 9 , the latch unit  823  includes a first latch  901  contacted to the first divider  822  and outputting a quotient from the first divider  822  whenever a remainder (RMD) is “0”, a second divider  902  serial-contacted to the first latch  901 , dividing an output signal of the first latch  901  by 75 and outputting a quotient, a third divider  903  dividing an output signal of the second divider  902  by 60 and outputting a quotient and a second latch  904  outputting the ID code (LID) by being inputted output signals of the second divider  902  and third divider  903 . Hereinafter, the operation of a record processing unit of the information recording apparatus in accordance with the present invention will now be described in detail with reference to accompanying  FIGS. 7˜9 . 
     First, the wobble signal detecting unit  705  detects a wobble signal in a push-pull signal outputted from the optical pickup  701  by passing the push-pull signal through a carrier signal bandwidth of 22.05 kHz. Herein, the wobble signal detecting unit  705  is constructed with, a BPF (Band Pass Filter) same as the BPF  801  as shown at  FIG. 8  and detects a wobble signal by passing the push-pull signal outputted from the optical pickup  701  through a carrier signal bandwidth of 22.05 kHz. 
     The ATIP decoder  706  restores the ATIP information as a physical address by using the wobble signal detected from the wobble signal detecting unit  705 . In addition, the ATIP decoder  706  generates a write channel clock signal (CWRT-CLK) adaptable to a present recording density, converts an ID code of the restored ATIP information into a linear code, adjusts a length of the linear code in accordance with the adjustment ratio m/R of the recording density, and converts it into a time code. The ID code (LID) converted into the time code is inputted to the microcomputer  710 . In addition, the ATIP decoder  706  generates an error discrimination signal (LID-OK) indicating an error of the ID code (LID) and a flag signal (LID-flag) indicating a start position of the ID code (LID) by performing an error correction of the ID code (LID). In addition, the ATIP decoder  706  generates a write channel clock signal (CWRT-CLK) its frequency varies adaptively in accordance with a recording density in order to record same quantity of recordable data per a sub-code frame. The operation of the ATIP decoder  706  will now be described in more detail with reference to accompanying  FIG. 8 . 
     First, the slicer  802  generates a carrier signal by slicing a wobble signal outputted from the BPF  801  with a certain slice level. 
     The phase comparator &amp; LPF  803  compares a phase of the carrier signal outputted from the slicer  802  with a phase of an output signal of the seventh frequency divider  805  and generates a control signal corresponding to the phase difference. 
     The VCO  804  generates the write channel clock signal (CWRT-CLK) by varying an oscillation frequency in accordance with the control signal outputted from the phase comparator &amp; LPF  803 . The number of clock of the write channel clock signal (CWRT-CLK) per one frame is defined as 2n×m (herein, n is an integer not less than j) and is determined as integer-times of the wobble signal. Herein, n can be set as 2 or 14, when n and R are set as 14, 7, respectively, the m can be set as 7, 8, 9, 10, 11, 12, 13, . . . in accordance with a recording density of a present recording frame. 
     The eighth frequency divider  806  converts a frequency of the write channel clock signal (CWRT-CLK) as 44.1 m (2×fc) kHz by dividing the record channel clock signal (CWRT-CLK) by n×m. The output signal of the eighth frequency divider  806  is inputted to the phase comparator &amp; LPF  803  by being divided by 2 by the seventh frequency divider  805 , and is restored as a bi-phase clock signal (PCLK) of 6.3 kHz by being divided by 7 by the ninth frequency divider  816 . 
     The frequency demodulator  807  demodulates the ATIP information by sampling the carrier signal outputted from the slicer  802  with the write channel clock signal (WRT-CLK). 
     The synchronous signal detecting unit  808  detects a frame synchronous signal (Synch) in the ATIP information from the frequency demodulator  807 . The frame synchronous signal (Synch) detected from the synchronous signal detecting unit  808  is inputted to the decoder &amp; latch  810 . 
     The bi-phase demodulator  809  demodulates a bi-phase signal by the bi-phase clock signal (PCLK) inputted from the seventh frequency divider  816  and provides the demodulated bi-phase signal to the decoder &amp; latch  810 . 
     The decoder &amp; latch  810  restores an ID code from a channel bit stream inputted from the bi-phase demodulator  809  by the data channel clock signal (DCLK) which is generated by dividing the bi-phase clock signal (PCLK) by 2 and frame synchronous signal (Synch) and performs an error correction about the ID code by using an error correction code (CRC). In addition, the decoder &amp; latch  810  generates a CRC flag signal (CRC FLAG) indicating an error occurrence position. 
     The first multiplier  811  multiplies  60  by minute information of the ID code outputted from the decoder &amp; latch  810 , and the first adder  812  adds the minute information converted into second information to second information from the decoder &amp; latch  810 . 
     The second multiplier  814  multiplies  75  by an output signal of the first adder  812  in order to convert the output signal into a frame volume. 
     The second adder  819  converts the ID code (LID) as the time code format into a linear code by adding frame information from the decoder &amp; latch  810  into the output signal of the second multiplier  814 . The output signal of the second adder  819  which is address information corresponding to a present position of an ATIP frame accessed at present is inputted to the third multiplier  820 . 
     The third multiplier  820  multiplies the m by the output signal of the second adder  819  and provides it to the counter  821 . 
     The counter  821  loads the output signal of the third multiplier  820  by an output signal of the AND gate  813  and at the same time outputs a counter value by counting a clock signal outputted from an eleventh frequency divider  817  from a load value. 
     The AND gate  813  outputs a logical signal of “1” when there is no error in the ID code detected from the decoder &amp; latch  810  and the frame synchronous signal (Synch) is detected. In more detail, the counter  821  loads the output value of the third multiplier  820  when the frame synchronous signal (Synch) is detected normally and counts a clock signal (CCLK) outputted from the eleventh frequency divider  817 . 
     The eleventh frequency divider  817  divides the write channel clock signal (CWRT-CLK) by 14nR. Accordingly, the clock signal (CCLK) inputted to the counter  821  has the number of clocks corresponding to m/7R per frame. The count value outputted from the counter  821  shows the total clock signal (CCLK) from an initial position of a track to a present access position. 
     In the meantime, when an error occurs in the ID code (ID), the decoder &amp; latch  810  maintains a count value of the counter  821  by outputting a logical “0” to the AND gate  813 . Accordingly, although an error occurs in the ID code, a total number of clocks from the initial position of the track to the present can be gotten. In addition, although a frame synchronous signal (PYre) is not detected, an output signal logical value of the AND gate  813  is “0”, the count value of the counter  821  is maintained. 
     The first divider  822  divides the count value from the counter  821  by a certain value “R”, outputs its quotient to an input terminal of the latch unit  823 , and outputs a remainder (RMD) to a control terminal of the latch unit  823  and flip-flop  818 . In addition, the remainder (RMD) generated from the first divider  822  is outputted to the microcomputer  710  as an ID code flag signal (LID-FLAG). 
     The latch unit  823  converts the linear-coded ID code (LID) into a time code so as to be adaptable to the optical recording medium. In more detail, the first latch  901  outputs the quotient inputted from the first divider  822  to the second divider  902  whenever the remainder (RMD) is “0”. 
     The second divider  902  divides an output signal of the first latch  901  by 75, provides a quotient to the third divider  903 , and provides a remainder to a frame latch (FF) of the second latch  904 . 
     The third divider  903  divides an output signal of the second divider  902  by 60, provides a quotient to a minute latch (MM) of the second latch  904 , and provides a remainder to a second latch (SS) of the second latch  904 . The second latch  904  outputs the ID code (LID) by being inputted output signals of the third divider  903  and second divider  902 . 
     The logical ID code (LID) converted into the time code by the latch unit  823  includes logical address information of a record unit region different from the ATIP frame preformatted onto the optical recording medium and includes 588×98 number of channel bit. In other words, user information is recorded onto the optical recording medium in accordance with the logical address information. 
     The flip-flop  818  generates the ID code error discrimination signal (LID-OK) with inputs of a remainder (RMD) outputted from the first divider  822  and a reset signal (LID FLAG-RST) from the microcomputer  710  and outputs it to the microcomputer  710 . 
     The microcomputer  710  generates a record start signal (LWRT-ON) by synchronizing with the flag signal (LID-FLAG) from the ATIP decoder  706  and generates the sub-code by using the logical ID code (LID). 
     The CIRC encoder  709  inserts an error correction code into the inputted recordable data. The modulation/sub code inserting unit  708  modulates recordable data outputted from the CIRC encoder  709  into an EFM code by sampling the recordable data with the write channel clock signal (CWRT-CLK) and inserts the sub-code outputted from the microcomputer  710  into the EFM frame. 
     The laser power controller  707  controls a laser diode of the optical pickup  701  in accordance with a record channel signal from the modulation/sub-code inserting unit  708 . 
     In recording of user information onto an optical recording medium, the microcomputer  710  generates the record start signal (LWRT-ON) by synchronizing with a record start position (MM:SS:FF (START)) of the logical ID code (LID) outputted from the ATIP decoder  706 . The modulation/sub-code inserting unit  708  generates a write signal by sampling the user information (recordable data) with the write channel clock signal (CWRT-CLK) converted in accordance with a recording density. 
     In the meantime, the microcomputer  710  cuts off the record start signal (LWRT-ON) at the record end position (MM:SS:FF (END)). Herein, the modulation/sub-code inserting unit  708  ends a record channel signal generation by synchronizing with the flag signal (LID-FLAG) corresponding to the record off position. The sub-code frame recorded onto the optical recording medium as a length different physically from the ATIP frame by the logical address information includes 98 EFM frames same as the prior art. Herein, when a length of unit record region in accordance with the logical ID code (LID) is shorter by setting the recording density adjustment ratio m/R bigger and the number of write channel clocks allocated to the unit record region is same, a recording density of a pertinent unit record unit can increase. 
       FIG. 10  is a waveform diagram illustrating an input/output of the record processing unit of the information recording/reproducing apparatus as shown at  FIGS. 7˜9 . In other words,  FIG. 10  illustrates input/output of the frame synchronous signal (Synch), ATIP information, flag signal (LID-FLAG) indicating a start position of the ID code (LID) of the restored ATIP information, an error discrimination signal (LID-OK) indicating an error of the ID code, a logical address signal (LID), a record start signal (LWRT-ON) 
     As described above, the information recording method and apparatus in accordance with the present invention generates a logical address indicating a unit record region having a length different from a physical length of an ATIP frame preformatted onto an optical recording medium and a write channel clock signal varied in accordance with a recording density of user information included in the unit recording region. Accordingly, the information recording method and apparatus in accordance with the present invention can improve a recording density of a unit record region defined in accordance with the logical address information by making the unit record region be shorter than the ATIP frame and generating a write channel clock signal so as to be adaptable to the recording density. 
     In addition, the information recording method and apparatus in accordance with the present invention can efficiently provide a logical address varied in accordance with recording density variation of the unit record region by detecting an ID code in the optical recording medium, converting the detected ID code into a linear code, converting a value of the linear code in accordance with a recording density, and converting again the linear code into a time code adaptable to the optical recording medium. 
     As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be constructed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalence of such meets and bounds are therefore intended to be embraced by the appended claims.