Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Control of information signal processing channel
Reexamination Certificate
2001-05-11
2004-06-22
Tran, Thang V. (Department: 2651)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Control of information signal processing channel
C369S047540
Reexamination Certificate
active
06754148
ABSTRACT:
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 wit 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
Birch & Stewart Kolasch & Birch, LLP
LG Electronics Inc.
Tran Thang V.
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