JPH0479077A - Draw method for cd-wo disk - Google Patents

Abstract

PURPOSE:To always enable DRAW(direct-read-after-warite) at a correct position by recording data after deciding the recording position based on the ATIP (Absolute Time In Pregroove) synchronizing signal of ATIP information when the ATIP information is missed at the recording position. CONSTITUTION:An ATIP demodulation circuit 11 demodulates an ATIP data from a data signal received through an RF amplifier 8 and supplies the data to a motor controller 9, CPU 13 and encoder timing counter 16. An interruption controller 14 instructs laser timing to be generated based on a signal from a digital signal processing circuit 12 and interruption timing in the case of DRAW to the CPU 13 based on signals from the ATIP demodulation circuit 11, digital signal processing circuit 12 and CPU 13. When the ATIP information is missed at the recording position, the data is recorded after deciding the recording position based on the ATIP synchronizing signal of the ATIP information. Thus, DRAW is always enabled at the correct position.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method for appending data to a CD-WO disc, and particularly relates to a method for appending data to a CD"-WO disc, which enables correct recording even when an ATIP code is missing. .

(Prior art) CD-WO01rit, which can be written only once
In the eOnce) device, A T I P (Absolute
Time InP re(] roOVe) Pre group (Pre group) formed by FM modulation of data
Spindle servo control is performed based on a WOBBLE signal obtained from the groove via a pickup.

Furthermore, when information is additionally recorded on a CD-WO disc, the search for the additional recording position and the timing of recording are determined in accordance with standards that are currently recognized worldwide.

(Problems to be Solved by the Invention) As described above, in the conventional CD-WO disc write-once method, the recording position is determined while managing time based on the ATIP information (code) of the pre-group.

However, if for some reason the recording condition of the frame before the position to be added is deteriorated and the frame is repaired (lack of AT IP coat), there is a pressure that it will not be possible to write additionally at the correct position. There is.

Therefore, the purpose of this invention is to make it possible to write additionally at the correct position even if the ATIP code at the recording position is missing.
An object of the present invention is to provide a method for additionally writing on a D-WO disk.

(Means for Solving the Problems) In order to solve the above-mentioned problems, CD-W according to the present invention
The additional recording method for O discs is to record information while managing time based on ATIP information, which is formed in track grooves and indicates absolute time information.
In the WO disc append method, A is placed at the position where recording is to be made
When TIP information is missing, the recording position is determined and recorded based on the ATIP synchronization signal of the ATIP information.

(Operation) In this invention, the ATI of the position to be recorded due to some reason
If the P code is missing, the ATI obtained during demodulation
Since the ATIP information is interpolated by counting the P synchronization signals, additional writing can be performed at the correct position using the interpolation result even if there is no ATIP coat at the recording position.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a basic configuration block diagram of a CDWO device for explaining an embodiment of the CD-WO disc write-once method according to the present invention.

A CD-WO or CD-DA disk 1 is driven and rotated by a motor 2. The pickup 3 is arranged close to the disc 1 and records data on the disc 1 and reads data from the disc 1. Pickup 3 is
Further, the transfer in the radial direction of the disk is controlled by the automotor 4.

The output from the pickup 3 is sent to an RF amplifier 8 and a surf circuit 1 that controls the force surf and trough kink servo 3.
0 and a digital signal processing circuit (tecoder) 12, which is similar to a conventional CD player.

The digital signal processing circuit 12 and the SURHO' circuit 10 are connected to the CP
Controlled by U13.

The digital signal processing circuit 12 demodulates the recorded data and generates subcodes such as time information, generates a rotation control signal for controlling the rotation of the motor 2 from the data from the disk 1, and sends the rotation control signal to the motor controllers 0 to 9. Send.

The motor controller 9 includes the digital signal processing circuit 1
2, it is controlled by a rotation control signal from the ATIP demodulation circuit 11 and a tracking error signal supplied via the RF amplifier 8.

The data written to the disk 1 is EFM-modulated by the encoder 6 together with the time code (time information) from the time code generation circuit 7 and input to the laser modulation circuit 5 .

The laser modulation circuit 5 receives the EFM signal from the encoder 6 and controls the recording intensity of a laser built into the pickup 3 to control recording and reproduction of data on the disk 1.

The encoder 6 is controlled by the CPU 1B and converts recording data into CD format.

The ATIP demodulation circuit 11 demodulates ATIP data (absolute time data that increases from the inner circumference side to the outer circumference side of the disk) from the data signal received via the RF amplifier 8, and outputs the data to the motor controller as described above. 9, supplies to the CPU 13 and encoder timing counter 16.

Is the interrupt controller 14 a digital signal processing circuit? @
12, a laser timing counter 15, and an ATIP demodulation circuit 11. Digital signal processing circuit 12 and CPtj
Based on the signal from No. 13, an interrupt timing instruction for additional writing is given to CP'013.

The laser timing counter 15 counts the laser power variable timing during continuous recording, reads the subcode from the subcode synchronization signal, and counts the clock.
When the set count value is reached, an interrupt signal is generated and sent to the interrupt controller 14.

The switch 17 switches the EFM signals from the encoder 6 and the RF amplifier 8 under the control of the CPL'13.

Hereinafter, an embodiment of this invention will be described with reference to the flowchart of FIG. 9, where the previous recording is at the 10.2030th position. The time code generation circuit 7 is set to generate subcodes starting from 10.2031.

Figures 2 to 4 show the main processing routine, and Figures 5 to 4 show the main routine of the process.
FIG. 7 shows an ATIP read interrupt routine, and FIGS. 8 and 9 show an encoder start interrupt routine and a racer interrupt routine, respectively.

In Fig. 2, recording starts when a recording command is received, and the pickup is first moved to the lead-in area (Lead-in area).
in area) (step 511), and set the motor to four BBLE mode (step 512).
) - operate various servos such as focus, tracking, and phytoservo control (step 51B), and perform EFM
Fast forwarding is performed to the program area where the signal is recorded (step S14 and step 515).

When the program area is reached, the motor is switched to EFM mode and set (step 516), search processing is performed (step 517), and the motor is moved to the target position. This is because EFM mode or outer circumference search is more stable than WOBBLE mode, which is difficult to apply rough servo to, when setting the EFM mode I\ of the second motor.

Approach the target position, pause at a position approximately one track before the recording position (step 518), and turn on the motor! l0BBLE
Set it as a mote (step 519) and wait for the boss to be released.

In step S20 of FIG. 3, if the pose is not canceled, the pose process is executed, and if the pose is canceled, it is determined in step S21 whether the current position is sufficiently close to the additional recording position, and if it is not sufficiently close, , performs a search process S22. When it is sufficiently near, the recording start request flag is set to H°° (step 823).

After that, it is determined in step S24 whether or not the laser has switched to the recording mode (REC), and if it has been switched, the recording routine S26 is reached; if not, it is determined that a time has elapsed (step S25>), and if it has not been timed out, it is determined in step S24. The process returns to step 527, and if there is a timeout, error processing is performed (step 527).

In FIG. 4, when recording is stopped, the end position should be set several frames ahead of the current position (step 531).
, sets the recording end request flag to 'H' (step 532).Then, in step 533, the laser starts playback (
PB), and if it has, the disk stop routine is reached (step 5).
35), if the switching has not occurred, it is determined whether or not the time has elapsed (step 534). If the time has not exceeded, the process returns to step 333, and if the time has exceeded, error processing is performed (step 836).

Next, when reading the ATIP in FIG.
The recording start request flag is checked in step 1, and if it is "H", the process proceeds to process (2) in FIG. 6, and the flag is "L".

If so, check the recording end request flag, and if it is "H", the process will proceed to the process in Figure 7, and if it is "L", it will be CR.
Check C (step 543). Here, check whether the CRC or ○ is the ATIP data.Step 544
), if the CRC is not OK, return processing is performed.

In step S41, the recording start request flag is set to H.

If YES, the CRC is checked in step S45 in FIG.

In step S45, when it is determined that there is an error by the CRC check, one frame is added to the previous ATIP data (step 546), and it is determined in step S48 whether or not the target time is reached, and if not, the process returns to If it is the target time, the recording start request flag is cleared (step 849), and an encode start interrupt is permitted (step 550).

On the other hand, in step S42, the recording end request flag is set to "H".
If so, check the CRC in step S51 of FIG. 7, and if OK, proceed to step 8 to store the ATIP data.
53) The process proceeds to step S54.

If an error is determined by the CRC check, the previous A
If you want to add one frame to the TIP data, step 552)
After that, in step S54, it is determined whether the target time is reached. When the target time is reached, the recording end request flag is cleared in step 555), the laser interrupt is enabled in step 856), and the process returns to 6. In other words,
This routine normally only reads the ATIP, checks the CRC, and stores the data, but when the recording start request flag becomes H'', it checks the CRC and confirms OK.
In the case of , the data is stored as is, and in the case of an error, one frame is added to the previous data and the data is interpolated. . Here, the interrupt signal for this routine is never missed and
The period is approximately 758 z. Next, set the target time (in this example, 10.2, one frame before 1020:30).
0: When reaching 29), the recording start request flag is cleared and the encode start interrupt is enabled.

By the encoder timing counter interrupt signal,
When an encoder start interrupt occurs, the encoder starts at step S61 in FIG. 8 and generates an EFM using the subcode of the previously set time. After that, the encoder start interrupt is disabled in step S62'), and it is determined whether or not there is an EFM signal before (step 363).
, otherwise input the EFM signal from the encoder (step 564), and enable laser interrupt (step 56).
5).

In step 363, if there is an EFM signal before, laser interrupt is enabled. In other words, since this is an additional recording, the EFM switching is left on the RF amplifier side in order to generate the laser timing from the EFM signal recorded on the disk. Then, allow Reza to interrupt. The laser interrupt is the synchronization signal (10:20/31 subcode).
This occurs when the set value is counted from the 0.degree. 20.30 subcoat capture signal), and the laser interrupt routine shown in FIG. 9 is reached.

In FIG. 9, when there is a laser interrupt, it is determined whether the laser is in the recording (REC) or playback (PB) state (step 571), and if it is in the PB state, the laser is set to the recording output (step 572); The laser interrupt is disabled (step 873), and the EFM is input from the encoder (step 574). Thereafter, a timing counter is set for playback (PB) so that an interrupt occurs at the timing to turn off the laser (step 575).

In step S71, when the laser is in the REC state, the laser is set to PB power (step 876), the encoder is stopped (step 577), the laser interrupt is disabled (step 578), and the EFM is input from the disk (step 579). Set the laser timing counter for recording (REC).

The above example is a routine for additional writing, and in the case of the first song, since there is no EFM signal before, all searches are performed using WOBB.
This is done in LE mode, and the EFM input is also switched at the same time as the encoder starts. This routine can also be used to turn off the laser precisely, in which case you can input the end time in advance at the start, or set a few frames ahead when the stop command is received. It can be terminated by setting the laser termination request flag.

FIG. 10, FIG. 11, and FIG. 12 show a timing chart for additional recording, a timing chart for the first song, and a timing chart for ending.

10 and 11, ATIP information (e.g. 10
・20231) ATIP synchronization signal, synchronization signal S added to EFM signal. subcode synchronization signal, encoder start interrupt signal, encoder start, laser interrupt signal (for example, from So to 26EF
The timing is determined by the M clock, and when it ends, the S
. ), the timing chart for racer start, and EFM switching is shown, and in Fig. 10, ■, ■, and ■ indicate the synchronization signal to Safco-1 of the EFM signal from the disk, and ■ indicates the subcode synchronization signal of the EFM signal from the encoder. In addition, in Fig. 11, the signals ■ to ■ do not actually exist, and the EFM signal is not recorded when the first song is recorded, so the EFM switching signal that starts the encoder will rise depending on the presence or absence of the EFM lock signal. After that, Safcod synchronization can be obtained.

(Effects of the Invention) As explained above, in the CDWO disk additional writing method according to the present invention, even if the ATIP coat at the position to be recorded is missing for some reason, the ATIP synchronization signal is counted and interpolated. , it will always be appended at the correct position.

[Brief explanation of the drawing]

1111] is a flowchart showing the main routine of the operation process of an embodiment of the present invention, and FIGS. 2 to 4 are
Flowcharts illustrating the main routine of the operation process of one embodiment of this invention, FIGS.
A flowchart showing the interrupt routine for reading IP;
Fig. 8 is a flowchart showing the encoder start interrupt routine of this embodiment, Fig. 9 is a diagram showing the resetting interrupt routine of this embodiment, Fig. 10 is a timing chart for additional recording, and Fig. 11 is for the first song. FIG. 12 is a timing chart at the end of the process. 1. Disk, 2. Motor, 3. Pickup, 4. Foot motor, 5. Laser modulation circuit, 6. Encoder, 7. Time coat generation circuit, 8. RF amplifier, 9.-Motor controller, 10.
Surho circuit, 11-ATIP demodulation circuit, 12-tental signal processing circuit, 13-CPtJ, 14-interrupt controller, 15-
・Laser timing counter, 16・Encoke timing counter 17...Switcher.

Claims (1)

[Claims] ATIP formed in the track groove and indicating absolute time information
A CD that records information while managing time based on information.
- A CD-WO disc additional recording method, characterized in that when ATIP information is missing at a position to be recorded, the recording position is determined and recorded based on an ATIP synchronization signal of the ATIP information.
How to add data to a disc.