TWI423253B - Recording apparatus and associated recording method - Google Patents

Description

Burning device and burning method

The present invention relates to a burning method and apparatus for an optical disk drive, and more particularly to a burning method and apparatus capable of reducing the rotational speed of the optical disk drive.

The burning rate of a disc player (for example, 4X or 8X) depends mainly on the type of disc, and different types of discs have different time codes. If the quality of the optical disc or the optical disc itself deteriorates, the burning efficiency and quality will be affected, especially for a large number of burning, the poor burning quality will be more obvious.

Poor disc drive servo signals, such as defocus or buffer under-run due to slower data transfer rates from the host, can cause burn-in interruptions. After refocusing or replenishing the data to the buffer, the programming is reconnected and restarted. Since the burn rate does not change before and after the interrupt, interrupts and reconnections can occur repeatedly. Such continuous interruptions and reconnections seriously affect the burning rate, and may even lead to degradation of the burning quality, so that the readability of the optical disk deteriorates.

US Patent No. 2002/0172106 A1, "A device and method for controlling data writing when an error occurs in an optical drive", discloses a method for processing a burn interrupt when the burn is interrupted . However, this method does not prevent the occurrence of an interruption. In addition, if the quality of the optical disc is poor, the burning quality of the optical disc cannot be improved.

In view of this, the following technical solutions are provided:

Embodiments of the present invention provide a burning device for an optical disk drive, and the burning device includes a driver, a servo signal generator, a filter, and a counter. The driver controls the burning rate of the optical disc drive; the servo signal generator generates at least one servo signal; the filter has a specific bandwidth for generating the filtered servo signal; the counter generates the count value according to the filtered servo signal, and when the count value exceeds the trigger value Instructs the drive to reduce the burn rate of the optical drive to burn with a reduced burn rate.

The embodiment of the present invention further provides a burning method for a CD player. The burning method includes: performing a burning operation at a burning rate, wherein a burning rate of the optical disk drive is controlled by a driver of the optical disk drive; and receiving at least one servo Signal; filter the received servo signal; generate a count value according to the filter servo signal; when the count value exceeds the trigger value, interrupt the burn and reduce the burn rate of the CD player; and resume the burn at the reduced burn rate.

By using the burning device and the burning method of the invention, the timing of determining the speed reduction can be more precise, thereby improving the burning quality.

Certain terms are used throughout the description and following claims to refer to particular elements. It should be understood by those of ordinary skill in the art that manufacturers may refer to the same elements by different nouns. The scope of this specification and the subsequent patent application do not use the difference of the names as the means for distinguishing the elements, but the difference in function of the elements as the basis for the distinction. The term "including" as used throughout the specification and subsequent claims is an open term and should be interpreted as "including but not limited to". In addition, the term "coupled" is used herein to include any direct and indirect electrical connection. Therefore, if a first device is coupled to a second device, the first device can be directly electrically connected to the second device or indirectly electrically connected to the second device through other devices or connection means.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic illustration of an embodiment of an optical disk drive burning apparatus in accordance with the present invention. The burning device 10 for the optical disc drive comprises a signal generator 11, a demodulation unit 12, a level detector 13, a microprocessor 14, an encoder 15, a buffer 16, a host 17, a DSP 18 and a driver 19. The signal generator 11, the demodulation unit 12 and the level detector 13 constitute a servo signal generating unit 23. A signal generator 11 coupled to the optical pickup 21 is configured to synthesize an optical signal read from the optical disc 22 by the optical pickup 21 to generate a tracking error for track lock. Referred to as TE) signal, focus error (FE) signal for focusing and wobble signal for positioning or controlling the rotation rate. All of the above servo signals are then sent to the DSP 18 for processing to generate the drive signals TRO, FOO, FMO and DMO. The driver 19 can drive the optical pickup 21 by the drive signals TRO, FOO and FMO, and drive the motor 20 to rotate the optical disk 22 by the drive signal DMO. In addition to being transmitted from the signal generator 11 to the DSP 18, the TE, FE, and wobble signals are also sent to the demodulation unit 12 and the level detector 13, respectively. The demodulation unit 12 is configured to demodulate the wobble signal, and if the error rate is too high or the wobble synchronization pattern loss exceeds a preset threshold, the burn stop control unit 141 and the burn rate adjustment Mechanism 142 will be activated to interrupt programming and reduce the rate of rotation of motor 20, i.e., the burn rate will be reduced. If the level detector 13 finds that the level of the TE and FE signals exceeds the preset threshold, the burn stop control mechanism 141 and the burn rate adjustment mechanism 142 will also be activated. The microprocessor 14 is used to control and execute the burn stop control mechanism 141 and the burn rate adjustment mechanism 142. First, the programming suspension control unit 141 transmits a programming pause command to the encoder 15 and notifies the host 17 to stop transferring the data to the buffer 16. After the burnout is confirmed, the microprocessor 14 will set the relevant parameters for reducing the rotational speed of the optical disk drive and transfer the parameters to the DSP 18 for generating the drive signal DMO to reduce the rotational rate of the motor 20. Subsequently, the burn-in suspension control unit 141 transmits a burn-in connection command to the encoder 15 to perform continuous burn-in work and continuously monitor whether the servo signal conforms to the burn-off condition. Further, the microprocessor 14 can also implement the detecting mechanism 143 to detect the error rate of the demodulated wobble signal and the frequency at which the buffer data is insufficient. If the error rate of the demodulated wobble signal or the frequency of occurrence of insufficient buffer data exceeds the preset threshold, the burn stop control mechanism 141 and the burn rate adjustment mechanism 142 will also be activated to interrupt the burn and reduce the burn rate.

The above burning program can be summarized as a flowchart as shown in FIG. Fig. 2 is a flow chart showing the burning of the optical disc drive according to the first embodiment of the present invention. First, the burning status is detected (step S202), it is confirmed whether the programming has been performed in the optical disk drive (step S204), and if so, the servo signal (for example, the level of the FE or TE signal or the rocking synchronous mode loss) is started. Detection (step S206); otherwise, go to step S202. It is confirmed whether the detected value of the servo signal exceeds the preset threshold (step S208), and if so, the programming is interrupted (step S210); otherwise, the process goes to step S206. Subsequently, it is confirmed whether or not the burning is stopped (step S212), and if so, the rotation rate of the optical disk drive is lowered (step S214), and the burning operation is restarted (step S216); otherwise, the process proceeds to step S210. The above-mentioned burning program can supplement the step of detecting the burning state, and is used for determining whether the optical disk system is in a burning state or a stop state, thereby avoiding the quality of burning due to errors during detecting the servo signal or reducing the burning rate. And the burning rate has an impact.

Fig. 3 is a flow chart showing the burning of the optical disk drive according to the second embodiment of the present invention. Steps S300-S304 in FIG. 3 are similar to steps S200-S204 in FIG. 2, and steps S308-S318 are similar to steps S200-S218 in FIG. 2, which will not be described in detail herein for the sake of brevity. Different from FIG. 2, in addition to using the servo signal as a reference for reducing the rotation rate of the optical disc drive, detecting the error rate of the demodulated wobble signal or the number of burn interrupts caused by insufficient buffer data during a period of time (that is, the frequency at which the buffer data is insufficient to occur) (step S306) can also serve as a reference for starting the burn rate adjustment mechanism. If the error rate of the demodulation wobble signal or the frequency of insufficient buffer data exceeds the preset threshold, the programming will not restart until the rotation speed of the optical disk drive decreases.

In addition, other signals, such as the temperature of the driver, the wobble jitter of the wobble signal, or the write power can also be used as a deciding factor for reducing the spin rate of the driver. The above parameters can be monitored and controlled before burning, so that the burning quality of the burning start can be further improved.

Similar to Fig. 1, Fig. 4 is a schematic view showing another embodiment of the burning apparatus 40 of the optical disk drive according to the present invention. In contrast to Fig. 1, the wobble dithering device 30 replaces the demodulation transforming unit 12 for detecting the wobble of the wobble signal, and the level detector 13 in Fig. 1 is omitted. The temperature and write power level of the driver detected by temperature sensor 24 is communicated to microprocessor 14. Therefore, the temperature, wobble jitter, and write power of the driver are further considered for determining the timing of reducing the rate of rotation of the driver 19. If the microprocessor 14 is capable of calculating the jitter of the wobble signal, the wobble jittering device 30 can be omitted. The microprocessor 14 further includes a maximum write power estimation mechanism 144 for estimating the maximum value of the write power according to the optimal power calibration (OPC) result during the burn process, and writing the maximum Power estimation mechanism 144 is used to control DSP 18.

Figure 5 shows the control program for the drive rate before burning. The drive rate and associated settings are set before the burn (step S502), then the wobble jitter and the temperature of the drive are detected, the write power is calibrated and estimated (step S504). It is confirmed whether at least one of the wobble jitter, the temperature of the driver, and the write power exceeds its corresponding preset value (step S506), and if so, the drive rate is slowed down, and the related setting is changed (step S508). Otherwise, the rate of the drive and the associated settings are considered to be in a safe condition and burning begins (step S510).

Figure 6 shows the control procedure for the drive rate during the burn-in (i.e., after the start of programming). The drive rate and related settings are set and the programming is started (step S602), and then the temperature of the driver, the wobble jitter, and the write power are detected (step S604). It is confirmed whether the temperature of the driver, the wobble jitter, or the write power exceeds the preset threshold (step S606), and if so, the programming is interrupted, otherwise, the process goes to step S604. Confirm that the rotation rate of the drive is reduced after the burn stop. The burning will not restart until the rotation speed of the CD player is reduced. Steps S608-S616 are similar to steps S210-S218 in FIG. 2, and are not described in detail herein for the sake of brevity.

The burn rate has increased with the development of technology. However, the high burn rate can introduce noise into the servo signal, where the noise can be caused by disc quality characteristics (e.g., uneven coloring of the disc) or characteristics of the optical disc mechanism (e.g., vibration).

Fig. 7 is a schematic view of a burning device 70 for an optical disk drive according to an embodiment of the present invention. The programming device 70 includes a signal generator 11, a microprocessor 71, an encoder 15, a buffer 16, a host 17, a DSP 18, and a driver 19. A signal generator 11 coupled to the optical pickup 21 is configured to synthesize an optical signal read from the optical disc 22 by the optical pickup 21 and generate a servo signal, such as a TE signal for track locking, for focusing FE A signal, a wobble signal for locating or controlling the burn rate, and a sub-beam add (SBAD) signal representing the total intensity of the reflected light. The servo signals are then sent to the DSP 18 to generate drive signals TRO, FOO, FMO and DMO to the driver 19. In addition, DSP 18 filters filter signals using filter 72 to filter out noise. In some embodiments, filter 72 can be implemented by hardware rather than by DSP 18. The driver 19 drives the optical pickup 21 in accordance with the drive signals TRO, FOO and FMO, and drives the motor 20 to rotate the optical disk 22 in accordance with the drive signal DMO. Therefore, the burning rate of the optical disk drive is controlled by the drive 19. The microprocessor 71 receives and detects the filtered servo signal to determine whether to reduce the burn rate for programming. The microprocessor 71 can detect whether the signal level of the filtered servo signal exceeds a certain threshold. The microprocessor 71 can include a counter to generate a count value in accordance with the filtered servo signal. The counter can generate a count value by calculating the number of times the signal level of the filtered servo signal exceeds a certain threshold value. The counter can be implemented in circuitry external to microprocessor 71 or internal to microprocessor 71. In addition, the circuit external to the microprocessor 71 can also be used to detect whether the signal level of the filtered servo signal exceeds a certain threshold value, so as to reduce the burden on the microprocessor 71. Once the signal level of the filtered servo signal is greater than a particular threshold value, microprocessor 71 updates the count value of the counter. When the count value of the counter exceeds a trigger value, the microprocessor 71 sends a burn-on pause command to the encoder 15 and notifies the host 17 to stop transferring the data to the buffer 16. After the burn stop is confirmed, the microprocessor 71 sets relevant parameters for reducing the burn rate of the optical disk drive, and transmits the set parameters to the DSP 18 for generating the drive signal DMO to reduce the rotation rate of the motor 20. Subsequently, the microprocessor 71 sends a burn connection command to the encoder 15 to perform continuous programming and continuously monitor whether the servo signal conforms to the burn-off condition. Further, the microprocessor 71 can reset the counter to recalculate the number of times the signal level of the filtered servo signal exceeds a certain threshold. In some embodiments, when the burn rate of the optical disk drive is reduced, the microprocessor 71 can reset the counter to regenerate the count value.

In Fig. 7, filter 72 is implemented by DSP 18, which is a filter having a particular bandwidth, wherein the particular bandwidth can be determined based on the current programming frequency of the disc. Thus, when the microprocessor 71 notifies the DSP 18 to generate the drive signal DMO to reduce the rate of rotation of the motor 20, the DSP 18 can adjust the particular bandwidth of the filter 72 in response to the reduced rate of rotation of the motor 20. In the present embodiment, the filter 72 is a band pass filter having a bandwidth between a 4x (4X) burn rate and a 40x (40X) burn rate. For example, when the rotational speed of the shaft in the motor 20 is 250 Hz, the DSP 18 can adjust the coefficients of the filter 72 such that the filter 72 has a bandwidth ranging between 1 KHz and 10 KHz. In the present invention, a bandwidth range between a 4x (4X) burn rate and a 40x (40X) burn rate is used to filter low frequency noise caused by the burn rate, such as harmonics. And high frequency noise caused by the quality of the disc or the mechanism characteristics of the disc player. In one embodiment, filter 72 is implemented in circuitry external to DSP 18. In another embodiment, the filter 72 and the counter can be implemented in the same circuit, wherein the counter is used to calculate the number of times the signal level of the filtered servo signal exceeds a certain threshold.

Figure 8 is a schematic diagram of a burning method for an optical disk drive according to an embodiment of the present invention. First, in the optical disc drive, burning is performed at a burn rate programmed by the drive (step S802), and the servo signal generator generates a servo signal by synthesizing the optical signal read from the optical disc. Next, the filter receives at least one servo signal (step S804) and then filters the received servo signal with a particular bandwidth (step S806). Then, detecting whether the signal level of the filtered servo signal exceeds a specific threshold value, and when determining that the signal level of the filtered servo signal exceeds a certain threshold value, updating the counter count, that is, calculating the signal level of the filtered servo signal exceeds a specific The number of threshold values (step S808). When the count of the counter exceeds the trigger value, the burn-in suspension program is executed to interrupt the burn-in program, and the drive is notified to lower the burn-in rate (step S810). Subsequently, the programming is resumed at a reduced programming rate (step S812) and the particular bandwidth of the filter is adjusted in response to the reduced programming rate to filter the received servo signal in accordance with the reduced programming rate. The quality of the burn-in is improved by filtering the noise of the servo signal by using a filter having a bandwidth range between 4 times (4X) burn rate and 40 times (40X) burn rate.

The above are only the preferred embodiments of the present invention, and equivalent changes and modifications made by those skilled in the art to the spirit of the present invention are intended to be included in the scope of the appended claims.

10, 40, 70. . . Burning device

11. . . Signal generator

12. . . Demodulation unit

13. . . Level detector

14, 71. . . microprocessor

15. . . Encoder

16. . . buffer

17. . . Host

18. . . DSP

19. . . driver

20. . . motor

twenty one. . . Optical head

twenty two. . . Disc

twenty three. . . Servo signal generating unit

twenty four. . . Temperature Sensor

30. . . Swing shake device

72. . . filter

141. . . Burn stop control mechanism

142. . . Burning rate adjustment mechanism

143. . . Detection mechanism

144. . . Maximum write power estimation mechanism

S200~S218, S300~S318, S500~S510, S600~S616, S802~S812. . . step

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing an embodiment of an optical disk drive burning apparatus according to the present invention.

Fig. 2 is a flow chart showing the burning of the optical disk drive according to the first embodiment of the present invention.

Fig. 3 is a flow chart showing the burning of the optical disk drive according to the second embodiment of the present invention.

Figure 4 is a schematic view showing another embodiment of the optical disk drive burning apparatus according to the present invention.

Fig. 5 is a flow chart showing the burning of the optical disk drive before burning according to the third embodiment of the present invention.

Fig. 6 is a flow chart showing the burning of the optical disk drive during the burning according to the fourth embodiment of the present invention.

Figure 7 is a schematic view of a burning apparatus for an optical disk drive according to an embodiment of the present invention.

Fig. 8 is a flow chart showing a method of burning a disc player according to an embodiment of the present invention.

11. . . Signal generator

15. . . Encoder

16. . . buffer

17. . . Host

18. . . DSP

19. . . driver

20. . . motor

twenty one. . . Optical head

twenty two. . . Disc

70. . . Burning device

71. . . microprocessor

72. . . filter

Claims (13)

A burning device for an optical disk drive, the burning device comprising: a driver for controlling a burning rate of the optical disk; a servo signal generator for generating at least one servo signal; and a filter having a specific frequency Width, the filter filters the servo signal to generate a filtered servo signal; and a counter generates a count value according to the filtered servo signal, and when the count value exceeds a trigger value, instructs the driver to lower the optical disc drive The burn rate is programmed with the reduced burn rate; wherein the particular bandwidth comprises a range between four times the burn rate and forty times the burn rate. The burning device of claim 1, wherein the specific bandwidth of the filter is determined according to the programming rate of the optical disk drive. The burning device of claim 1, wherein the specific bandwidth of the filter is adjusted in response to the reduced burning rate. The burning device of claim 1, further comprising: a microprocessor, detecting whether a signal level of one of the filtered servo signals exceeds a specific threshold value, and when the signal level of the filtering servo signal The counter value of the counter is updated when the specific threshold value is exceeded. The burning device of claim 4, wherein the microprocessor resets the counter to regenerate the count value when the programming rate of the optical disk drive decreases. The programming device of claim 1, wherein the servo signal comprises at least one of a focus error signal, a tracking error signal, a wobble signal, and a sub beam summing signal. A burning method for a CD player, the burning method comprising: performing a burning operation at a burning rate, wherein the burning rate of the optical disk drive is controlled by a driver of the optical disk drive; The signal generator receives at least one servo signal; and filters the received servo signal by a filter having a specific bandwidth; and a counter of the optical disc drive generates a count value according to the filter servo signal; when the count value exceeds a trigger value, interrupting the burning and lowering the burning rate of the optical disk drive; and restarting the burning at the reduced burning rate; wherein the specific bandwidth comprises four times the burning rate to forty times A range between the burn rates. The burning method of claim 7, wherein the specific bandwidth of the filter is determined according to the burning rate of the optical disk drive. The method of burning according to claim 7, further comprising: adjusting the specific bandwidth of the filter according to the reduced programming rate. The method of claim 7, wherein the step of generating the count value further comprises: detecting whether a signal level of one of the filtered servo signals exceeds a specific threshold; and determining the filter servo signal When the signal level exceeds the specific threshold, the count value is updated. The method of claim 7, wherein the microprocessor of the optical disc is used to detect a signal level of the filtered servo signal. Whether a specific threshold value is exceeded or not, and when the signal level of the filtered servo signal exceeds the specific threshold value, the count value is updated. The burning method of claim 7, further comprising: resetting the counter to reduce the counting value when the burning rate of the optical disk drive decreases. The method of claim 7, wherein the servo signal comprises at least one of a focus error signal, a tracking error signal, a wobble signal, and a sub beam summing signal.